Merge branch 'develop'

.gitlab-ci.yml

@@ -1,33 +1,54 @@
-image: scalableminds/sbt:sbt-13-17
+default:
+  image: sbtscala/scala-sbt:eclipse-temurin-jammy-8u352-b08_1.8.3_2.13.10
+
+  cache:
+    key: "$CI_COMMIT_REF_SLUG"
+    paths:
+      - "sbt-cache"
+      - "target/streams"
+      - "lib/ocelot-brain/target"
 
 variables:
   GIT_SUBMODULE_STRATEGY: normal
   SBT_OPTS: "-Dsbt.global.base=sbt-cache/.sbtboot -Dsbt.boot.directory=sbt-cache/.boot -Dsbt.ivy.home=sbt-cache/.ivy"
   SBT_CACHE_DIR: "sbt-cache/.ivy/cache"
+  PACKAGE_REGISTRY_URL: "${CI_API_V4_URL}/projects/${CI_PROJECT_ID}/packages/generic/ocelot-desktop/${CI_COMMIT_TAG}"
+  PACKAGE_NAME: "ocelot-desktop-${CI_COMMIT_TAG}.jar"
 
-cache:
-  key: "$CI_COMMIT_REF_SLUG"
-  paths:
-    - "sbt-cache"
-    - "target/streams"
-    - "lib/ocelot-brain/target"
-
-before_script:
-  - sbt -v sbtVersion
+stages:
+  - build
+  - upload
+  - deploy
+  - release
 
 build:
   stage: build
+  before_script:
+    - sbt -v sbtVersion
+  tags:
+    - public
   script:
     - sbt assembly
   artifacts:
     paths:
       - target/scala-2.13/ocelot-desktop.jar
 
+upload:
+  stage: upload
+  image: curlimages/curl:latest
+  rules:
+    - if: $CI_COMMIT_TAG
+  script:
+    - |
+      curl --fail-with-body --header "JOB-TOKEN: ${CI_JOB_TOKEN}" --upload-file target/scala-2.13/ocelot-desktop.jar "${PACKAGE_REGISTRY_URL}/${PACKAGE_NAME}"
+
 pages:
   stage: deploy
   before_script: []
   rules:
     - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH || $CI_COMMIT_BRANCH == "develop"
+  tags:
+    - public
   script:
     - rm -rf public
     - mkdir public
@@ -36,3 +57,17 @@ pages:
   artifacts:
     paths:
       - public
+
+release:
+  stage: release
+  image: registry.gitlab.com/gitlab-org/release-cli:latest
+  rules:
+    - if: $CI_COMMIT_TAG
+  script:
+    - echo "Creating a new release for tag $CI_COMMIT_TAG."
+    - |
+      release-cli create \
+        --name "Release $CI_COMMIT_TAG" \
+        --tag-name "$CI_COMMIT_TAG" \
+        --description "$CI_COMMIT_TAG_MESSAGE" \
+        --assets-link "{\"name\":\"${PACKAGE_NAME}\",\"link_type\":\"package\",\"url\":\"${PACKAGE_REGISTRY_URL}/${PACKAGE_NAME}\"}"

README.md

@@ -3,131 +3,188 @@
 
 A desktop version of the renowned OpenComputers emulator Ocelot.
 
-[Download the latest build][download] / [mirror][download-mirror]
+[**Download** the latest build][download] / [mirror][download-mirror]
 
 ## Why
-You might already be happy with your choice of an OC emulator; after all, there
-is already a plenty of them.
-So why would you want to reconsider your life choices now all of a sudden?
+You might already be happy with your choice of an OC emulator;
+there is a plenty of them, after all.
+Why would you want to reconsider your life choices now all of a sudden?
 A fine question, indeed; perhaps, a list of features will persuade you.
 
 ### Powered by ocelot-brain
 At the heart of this emulator is [ocelot-brain][ocelot-brain] (uh, don't ask me),
-which is essentially the source code of OpenComputers stripped of everything
-Minecraft-specific and packaged as a Scala library.
+which is essentially the source code of OpenComputers decoupled of everything
+Minecraft-specific and repurposed as a Scala library.
 This makes Ocelot Desktop **the most accurate emulator** ever made.
-Your programs will run on the same version of Lua as used by the mod and have
+Your programs will run on the Lua implementation used by the mod and exhibit
 similar timings.
 The performance and memory constraints present in OC are also emulated.
 
 ### Customizable setups
-Computers can have the following components:
+Taylor your computer build to your needs!
+We provide a variety of components to choose from:
 
-- the 3 tiers of graphics cards
-- all kinds of network cards (wired, wireless)
-- a linked card
-- an internet card
-- a sound card (Computronics)
-- a redstone card in the both tiers
-- a data card (again, you can pick any of the three tiers)
+- graphics cards
+- network cards (wired, wireless)
+- linked cards
+- internet cards
+- redstone cards (including the second tier!)
+- data cards
 - hard disks
-- a floppy disk (in T3+ computer cases only)
+- floppy disks (in T3+ computer cases only, just like in OpenComputers)
 
-The choice is restricted by the tier of a computer case, just like in
-OpenComputers, to avoid building impossible configurations.
-Oh, did I forget to mention that Ocelot Desktop has both the CPUs and the APUs?
-Memory can likewise be installed according to your needs.
+Feel limited by the vanilla cards?
+No problem — we've even integrated some components from popular addons!
 
-If one computer is not enough, you can add another one.
-Or two, or a thousand, as long as your host doesn't collapse under the load,
-of course.
-The network cards are there for a reason — these newly spawned machines can
-communicate with each other.
-And relays may help you manage the wired networks.
+![Addon showcase][addon-showcase]
 
-Or, instead of employing an army of computers, you might want to connect a dozen
-of screens to a single machine, like in the movies.
-No problem — we've got that covered, too.
+- **Computronics:**
+  - `computer.beep()` does not excite your music sense enough?
+    Check out the **sound card**'s synthesis engine,
+    or string notes together on a bunch of **note blocks**!
 
-### Pretty graphical interface
+  - You have privacy concerns?
+    An ultra-precision blast of the **self-destructing card** might save your day!
+
+  - If, on the contrary, you're the kind to violate the privacy of others,
+    we've got a **camera** that reads video data from a real webcam.
+
+  - Those who seem to find no color in their life may appreciate the
+    **colorful lamps**.
+    Their iridescent glow will provide comfort in the darkest hour.
+    And they won't desert you.
+
+- **OpenFM:** for those lo-fi beats to chill and relax to while writing code.
+
+We'll make sure your setups are grounded in reality
+by having the maximum card tier in a slot depend on your computer case.
+Oh, did I forget to mention Ocelot Desktop has APUs as well?
+
+Explore the wonders of distributed computing by adding a couple of other
+computers to your workspace.
+(Or a thousand — if you think your host can handle this.)
+Network cards allow these newly spawned machines to talk to each other.
+And relays may prove useful to manage the wired networks.
+
+Perhaps, instead of enlisting a computer army,
+you want to attach a dozen of screens to a single machine
+(as they do in the movies).
+Well, no problem — we've got that covered, too.
+
+### Gorgeous graphical interface
 ![GUI][gui]
 
-A slick interface allows you to customize the setup to your liking.
-Add more computers, organize the connections between components, build complex
-setups, and manage your screen real estate to avoid distractions.
+Manage your screen real estate to avoid distractions.
+All nodes are draggable, as are windows.
+And screen windows in particular are also resizeable —
+click and drag the bottom-right corner if they take up too much space.
+Or hold <kbd>Shift</kbd> and let the window consume it all.
 
-Many additional options are hidden in the context menu — try hitting the
-right mouse button on the various things.
-For example, components will let you copy their address to the clipboard, and
-right-clicking on the TPS counter on the bottom allows you to change the
-simulation speed.
+![Window scaling][window-scaling]
 
-The emulator uses hardware acceleration to offload the daunting task of
-rendering its interface to a specialized device, so make sure you have a OpenGL
-2.1-capable graphics card.
+Many additional options are hidden in the context menus —
+try hitting the right mouse button on various things.
+For example, components will let you copy their address to the clipboard,
+and right-clicking on the TPS counter (on the bottom right)
+allows you to change the simulation speed.
+
+![TPS rate menu][tps-menu]
+
+Ocelot Desktop uses hardware acceleration to offload the daunting task of
+rendering its interface to a special-purposed device (your GPU),
+so make sure you have an **OpenGL 3.0-capable** graphics card.
+(Though, honestly, it's harder to find one that isn't, really.)
 
 ### Persistable workspaces
-It would be sad if, after all the hard work you put into adjusting the
-workspace, you have to do that again.
+Imagine putting many hours into wiring things up only to have to do it all from
+scratch the next time you open the emulator.
+That... would be sad and disappointing.
 I mean, OpenComputers can persist its machines just fine, right?
-By basing the emulator on its code, we've essentially inherited the ability
-to save workspaces on the disk and load them afterwards.
+Good news: by reusing its code, we've essentially inherited the ability
+to save workspaces on the disk and load them afterwards!
 
 Just in case, Ocelot Desktop will warn you if you smash the quit button without
 saving.
+We'd rather you didn't feel sad and disappointed.
 
 ### Cool features
-![Performance graphs][graphs]
+![Performance graphs][perf-graphs]
 ![Sound card GUI][sound-card]
 
 A few smaller features are worth mentioning, too:
 
-- Screens are resizeable — drag the bottom-right corner.
-- Windows are labeled with the corresponding block's address; however, you can
-  set a custom label — look for an option in the context menu.
-- The button in a computer case window shows the performance graphs:
-  the used memory, processor time and call budget.
-- Hold the Ctrl key while dragging blocks to have them snap to the grid.
+- Windows show the corresponding block's address by default.
+  However, you can relabel them: look for the option in the context menu.
+- The button ![][drawer-button] at the bottom of a computer case window
+  shows performance graphs: the memory, processor time, and call budget.
+- Hold the <kbd>Ctrl</kbd> key while dragging blocks to snap them to the grid.
 
 ## Download
-Decided to give Ocelot Desktop a shot? [Download the latest build][download] / [mirror][download-mirror]
+Decided to give Ocelot Desktop a shot?
 
-## How to build it?
-Just import the project in your favorite IDE.  
-Make sure to have Scala and SBT installed (manually or through IDE).
+[**Download** the latest build][download] / [mirror][download-mirror]
 
-Ocelot Brain library is added as a Git submodule, so do not forget to fetch it too.  
-Something like `git submodule update --init --recursive` should do the trick.
+## Hacking
+Just import the project in your favorite IDE.
+Make sure to have Scala and SBT installed (your IDE may assist you with that).
 
-Use `sbt run` to start Ocelot Desktop. Use `sbt assembly` to generate JAR file.  
-(It will appear at `target/scala-2.13/ocelot-desktop.jar` location.)
+We include [ocelot-brain][] as a Git submodule: don't forget to fetch it!
 
-If the compiler is complaining about missing BuildInfo class, or the version in
-the window title / logs looks outdated, use `sbt buildInfo` to generate fresh class.
+```sh
+$ git submodule update --init --recursive
+```
+
+To build from source and start Ocelot Desktop, type:
+
+```sh
+$ sbt run
+```
+
+If you want to get a JAR, use this:
+
+```sh
+$ sbt assembly
+```
+
+(You'll find it at `target/scala-2.13/ocelot-desktop.jar`.)
+
+In case you see the compiler complain about `BuildInfo` or just want to refresh
+the version displayed in the window title and the logs, run:
+
+```sh
+$ sbt buildInfo
+```
 
 ## Credits
-- **LeshaInc**, the author and maintainer of Ocelot Desktop.
-- **Totoro**, the creator of ocelot-brain and ocelot-online.
-- **bpm140**, who created marvelous Ocelot Desktop landing page.
-- **rason**, who stirred the development at the critical moment.
-- **NE0**, the bug extermination specialist.
-- **ECS**, who fearlessly jumped right into Scala jungle.
-- **fingercomp**, who wrote this README.
+- **LeshaInc:** the original author of Ocelot Desktop.
+- **Totoro:** the creator of [ocelot-brain][] and [ocelot.online][ocelot-online].
+- **bpm140:** produced the marvelous Ocelot Desktop landing page.
+- **rason:** stirred the development at the critical moment!
+- **NE0:** the bug extermination specialist.
+- **ECS:** leaped fearlessly into the Scala jungle.
+- **Smok1e:** added some light and color with new components from Computronics.
+- **Saphire:** scaled the UI for HiDPI screens.
+- **fingercomp:** wrote this README.
 
 ## See also
-- [Ocelot Desktop][ocelot-desktop] web page (link to the latest build, FAQ)
-- [ocelot.online][ocelot-online], a rudimentary web version of Ocelot
-- [ocelot-brain][ocelot-brain], the backend library of Ocelot Desktop
+- The [Ocelot Desktop][ocelot-desktop] web page
+  (links to the latest build, FAQ).
+- [ocelot.online][ocelot-online], a rudimentary web version of Ocelot.
+- [ocelot-brain][], the backend library of Ocelot Desktop.
 - [#cc.ru on IRC][irc] if you have any questions
-  (Russian, but we're fine with English too)
-- [Discord][discord] if you prefer so (we will not judge)
+  (Russian, but we're fine with English too).
+- Or [Discord][discord] if that's your fancy (we won't judge).
 
-[banner]: https://i.imgur.com/OzkpQZv.png
+[banner]: ./assets/banner.png "The Ocelot banner"
 [download]: https://cc-ru.gitlab.io/ocelot/ocelot-desktop/ocelot.jar
 [download-mirror]: https://ocelot.fomalhaut.me/ocelot.jar
-[gui]: https://i.imgur.com/O4bF7I8.png
-[graphs]: https://i.imgur.com/mG8UjhV.png
-[sound-card]: https://i.imgur.com/gnh3D6N.png
+[addon-showcase]: ./assets/addon-showcase.png "A workspace with colorful lamps and an OpenFM radio."
+[gui]: ./assets/gui.png "A screenshot of the GUI."
+[window-scaling]: ./assets/window-scale.gif "Demonstrates the screen scaling."
+[tps-menu]: ./assets/tps.png "The simulation speed menu (right-click on the TPS)."
+[perf-graphs]: ./assets/perf-graphs.gif "A demo of performance graphs."
+[sound-card]: ./assets/sound-card.gif "Shows the sound card UI while playing a melody."
+[drawer-button]: ./sprites/buttons/BottomDrawerOpen.png
 [ocelot-brain]: https://gitlab.com/cc-ru/ocelot/ocelot-brain
 [ocelot-online]: https://ocelot.fomalhaut.me/
 [ocelot-desktop]: https://ocelot.fomalhaut.me/desktop/

build.sbt

@@ -1,6 +1,6 @@
 name := "ocelot-desktop"
-version := "1.5.0"
-scalaVersion := "2.13.8"
+version := "1.7.1"
+scalaVersion := "2.13.10"
 
 lazy val root = project.in(file("."))
   .dependsOn(brain % "compile->compile")
@@ -16,6 +16,8 @@ lazy val root = project.in(file("."))
 
 lazy val brain = ProjectRef(file("lib/ocelot-brain"), "ocelot-brain")
 
+libraryDependencies += "org.scala-lang" % "scala-reflect" % scalaVersion.value
+
 libraryDependencies += "org.apache.logging.log4j" % "log4j-core" % "2.20.0"
 libraryDependencies += "org.apache.logging.log4j" % "log4j-api" % "2.20.0"
 libraryDependencies += "org.apache.logging.log4j" % "log4j-slf4j-impl" % "2.20.0"
@@ -33,7 +35,6 @@ libraryDependencies += "com.github.wendykierp" % "JTransforms" % "3.1"
 libraryDependencies += "com.github.sarxos" % "webcam-capture" % "0.3.12"
 
 // For OpenFM
-libraryDependencies += "javazoom" % "jlayer" % "1.0.1"
 libraryDependencies += "com.googlecode.soundlibs" % "mp3spi" % "1.9.5.4"
 libraryDependencies += "com.googlecode.soundlibs" % "vorbisspi" % "1.0.3.3"
 
@@ -42,4 +43,4 @@ assembly / assemblyMergeStrategy := {
   case _ => MergeStrategy.first
 }
 
-assembly / assemblyJarName := s"ocelot-desktop.jar"
+assembly / assemblyJarName := "ocelot-desktop.jar"

lib/ocelot-brain

@@ -1 +1 @@
-Subproject commit 42dd5a966456654968af777d625c3e2f8b9265fa
+Subproject commit fbea0b4295d3866f7bff71b442afce0a859e3712

project/assembly.sbt

@@ -1 +1 @@
-addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "1.2.0")
+addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "2.1.1")

project/build.properties

@@ -1 +1,2 @@
-sbt.version = 1.7.1
+# suppress inspection "UnusedProperty" for whole file
+sbt.version = 1.8.3

src/main/resources/ocelot/desktop/colorscheme.txt

@@ -58,10 +58,13 @@ TextInputForeground    = #333333
 TextInputBorderError        = #aa8888
 TextInputBorderErrorFocused = #cc6666
 
-ButtonBackground = #aaaaaa
-ButtonBorder     = #888888
-ButtonForeground = #333333
-ButtonConfirm = #336633
+ButtonBackground         = #aaaaaa
+ButtonBorder             = #888888
+ButtonForeground         = #333333
+ButtonBackgroundDisabled = #333333
+ButtonBorderDisabled     = #666666
+ButtonForegroundDisabled = #888888
+ButtonConfirm            = #336633
 
 BottomDrawerBorder = #888888
 
@@ -80,6 +83,7 @@ VerticalMenuBorder          = #dfdfdf
 
 SliderBackground = #aaaaaa
 SliderBorder     = #888888
+SliderTick       = #989898
 SliderHandler    = #bbbbbb
 SliderForeground = #333333
 
@@ -134,4 +138,6 @@ SoundCardWire3 = #69237f
 SoundCardWire4 = #7f2331
 SoundCardWire5 = #7f5123
 SoundCardWire6 = #7f7723
-SoundCardWire7 = #000000
+SoundCardWire7 = #000000
+
+ErrorMessage = #ff3366

src/main/resources/ocelot/desktop/images/spritesheet/spritesheet.txt

@@ -1,16 +1,16 @@
 BackgroundPattern 0 0 304 304
-BarSegment 329 349 16 4
+BarSegment 357 349 16 4
 ComputerMotherboard 305 129 79 70
 Empty 506 126 1 1
-EmptySlot 318 330 18 18
+EmptySlot 335 330 18 18
 Knob 385 129 50 50
 KnobCenter 436 129 50 50
 KnobLimits 305 200 50 50
 ShadowBorder 505 15 1 24
 ShadowCorner 301 305 24 24
 TabArrow 502 0 8 14
-buttons/BottomDrawerClose 337 330 18 18
-buttons/BottomDrawerOpen 356 330 18 18
+buttons/BottomDrawerClose 354 330 18 18
+buttons/BottomDrawerOpen 373 330 18 18
 buttons/OpenFMRadioCloseOff 242 402 7 8
 buttons/OpenFMRadioCloseOn 250 402 7 8
 buttons/OpenFMRadioRedstoneOff 502 87 8 8
@@ -19,20 +19,20 @@ buttons/OpenFMRadioStartOff 326 305 24 24
 buttons/OpenFMRadioStartOn 351 305 24 24
 buttons/OpenFMRadioStopOff 376 305 24 24
 buttons/OpenFMRadioStopOn 401 305 24 24
-buttons/OpenFMRadioVolumeDownOff 482 330 10 10
-buttons/OpenFMRadioVolumeDownOn 493 330 10 10
-buttons/OpenFMRadioVolumeUpOff 501 363 10 10
-buttons/OpenFMRadioVolumeUpOn 318 349 10 10
-buttons/PowerOff 375 330 18 18
-buttons/PowerOn 394 330 18 18
+buttons/OpenFMRadioVolumeDownOff 499 330 10 10
+buttons/OpenFMRadioVolumeDownOn 501 363 10 10
+buttons/OpenFMRadioVolumeUpOff 335 349 10 10
+buttons/OpenFMRadioVolumeUpOn 346 349 10 10
+buttons/PowerOff 392 330 18 18
+buttons/PowerOn 411 330 18 18
 icons/ButtonCheck 301 363 17 17
 icons/ButtonClipboard 319 363 17 17
 icons/ButtonRandomize 337 363 17 17
 icons/CPU 301 381 16 16
 icons/Card 318 381 16 16
 icons/ComponentBus 335 381 16 16
-icons/DragLMB 413 330 21 14
-icons/DragRMB 435 330 21 14
+icons/DragLMB 430 330 21 14
+icons/DragRMB 452 330 21 14
 icons/EEPROM 352 381 16 16
 icons/Floppy 369 381 16 16
 icons/HDD 386 381 16 16
@@ -54,7 +54,7 @@ icons/WaveNoise 401 363 24 10
 icons/WaveSawtooth 426 363 24 10
 icons/WaveSine 451 363 24 10
 icons/WaveSquare 476 363 24 10
-icons/WaveTriangle 457 330 24 10
+icons/WaveTriangle 474 330 24 10
 icons/WireArrowLeft 507 15 4 8
 icons/WireArrowRight 507 24 4 8
 items/APU0 233 305 16 96
@@ -108,6 +108,7 @@ items/Memory5 424 251 16 16
 items/NetworkCard 441 251 16 16
 items/RedstoneCard0 458 251 16 16
 items/RedstoneCard1 475 251 16 16
+items/SelfDestructingCard 318 330 16 32
 items/Server0 492 251 16 16
 items/Server1 305 268 16 16
 items/Server2 322 268 16 16

src/main/resources/ocelot/desktop/messages.txt

@@ -0,0 +1,5 @@
+Error.NoCPU = No CPU is installed in the computer.
+Error.ComponentOverflow = Too many components connected to the computer.
+Error.NoRAM = No RAM is installed in the computer.
+Error.OutOfMemory = Out of memory.
+Error.InternalError = Internal error, please see the log file. This is probably a bug.

src/main/scala/ocelot/desktop/OcelotDesktop.scala

@@ -2,6 +2,7 @@ package ocelot.desktop
 
 import buildinfo.BuildInfo
 import li.flor.nativejfilechooser.NativeJFileChooser
+import ocelot.desktop.inventory.Items
 import ocelot.desktop.ui.UiHandler
 import ocelot.desktop.ui.swing.SplashScreen
 import ocelot.desktop.ui.widget._
@@ -27,7 +28,7 @@ import scala.collection.mutable.ArrayBuffer
 import scala.concurrent.duration.Duration
 import scala.io.Source
 import scala.jdk.CollectionConverters._
-import scala.util.{Failure, Success, Try}
+import scala.util.{Failure, Success, Try, Using}
 
 object OcelotDesktop extends Logging {
   private val splashScreen = new SplashScreen()
@@ -46,7 +47,7 @@ object OcelotDesktop extends Logging {
 
   private val tickLock: Lock = new ReentrantLock()
 
-  def withTickLockAcquired(f: => Unit): Unit = withLockAcquired(tickLock, f)
+  def withTickLockAcquired(f: => Unit): Unit = withLockAcquired(tickLock)(f)
 
   private def mainInner(args: mutable.HashMap[Argument, Option[String]]): Unit = {
     logger.info("Starting up Ocelot Desktop")
@@ -61,19 +62,21 @@ object OcelotDesktop extends Logging {
     else
       Paths.get(customConfigPath.get)
     Settings.load(settingsFile)
+    Messages.load(Source.fromURL(getClass.getResource("/ocelot/desktop/messages.txt")))
     ColorScheme.load(Source.fromURL(getClass.getResource("/ocelot/desktop/colorscheme.txt")))
 
+    Items.init()
+
     splashScreen.setStatus("Initializing GUI...", 0.30f)
     createWorkspace()
 
     val loadRecentWorkspace = Settings.get.recentWorkspace.isDefined && Settings.get.openLastWorkspace
     root = new RootWidget(!loadRecentWorkspace)
 
+    UiHandler.loadLibraries()
     UiHandler.init(root)
 
     splashScreen.setStatus("Loading resources...", 0.60f)
-    // loading resources _after_ the UiHandler was initialized, because the native libraries are not available before
-    ResourceManager.initResources()
 
     splashScreen.setStatus("Loading workspace...", 0.90f)
     val cmdLineWorkspaceArgument = args.get(CommandLine.WorkspacePath).flatten
@@ -102,28 +105,39 @@ object OcelotDesktop extends Logging {
       }
     }
 
-    new Thread(() => {
-      while (true) {
-        Profiler.startTimeMeasurement("tick")
+    val updateThread = new Thread(() => try {
+      val currentThread = Thread.currentThread()
 
-        withTickLockAcquired {
-          workspace.update()
-          tpsCounter.tick()
+      while (!currentThread.isInterrupted) {
+        Profiler.measure("tick") {
+          withTickLockAcquired {
+            workspace.update()
+            tpsCounter.tick()
+          }
         }
 
-        Profiler.endTimeMeasurement("tick")
         ticker.waitNext()
       }
-    }).start()
+    } catch {
+      case _: InterruptedException => // ignore
+    }, "update-thread")
+
+    updateThread.start()
     splashScreen.dispose()
     logger.info("Ocelot Desktop is up and ready!")
     UiHandler.start()
 
     logger.info("Cleaning up")
+    updateThread.interrupt()
+
+    try updateThread.join() catch {
+      case _: InterruptedException =>
+    }
+
     WebcamCapture.cleanup()
     Settings.save(settingsFile)
-    ResourceManager.freeResources()
     UiHandler.terminate()
+    ResourceManager.checkEmpty()
 
     Ocelot.shutdown()
 
@@ -173,22 +187,27 @@ object OcelotDesktop extends Logging {
   private var savePath: Option[Path] = None
   private val tmpPath = Files.createTempDirectory("ocelot-save")
 
-  def newWorkspace(): Unit = {
+  Runtime.getRuntime.addShutdownHook(new Thread(() => {
+    FileUtils.deleteDirectory(tmpPath.toFile)
+  }))
+
+  def newWorkspace(): Unit = showCloseConfirmationDialog("Save workspace before opening a new one?") {
     root.workspaceView.newWorkspace()
+    savePath = None
     Settings.get.recentWorkspace = None
   }
 
-  def save(): Unit = {
-    if (savePath.isEmpty) {
-      saveAs()
-      return
-    }
-
+  private def saveTo(outputPath: Path): Unit = {
     val oldPath = workspace.path
-    val newPath = savePath.get
-    if (oldPath != newPath) {
-      val oldFiles = Files.list(oldPath).iterator.asScala.toArray
-      val newFiles = Files.list(newPath).iterator.asScala.toArray
+
+    if (oldPath != outputPath) {
+      val (oldFiles, newFiles) =
+        Using.resources(Files.list(oldPath), Files.list(outputPath)) { (oldDirStream, newDirStream) =>
+          val oldFiles = oldDirStream.iterator.asScala.toArray
+          val newFiles = newDirStream.iterator.asScala.toArray
+          (oldFiles, newFiles)
+        }
+
       val toRemove = newFiles.intersect(oldFiles)
 
       for (path <- toRemove) {
@@ -201,7 +220,7 @@ object OcelotDesktop extends Logging {
 
       for (path <- oldFiles) {
         val oldFile = oldPath.resolve(path.getFileName).toFile
-        val newFile = newPath.resolve(path.getFileName).toFile
+        val newFile = outputPath.resolve(path.getFileName).toFile
         if (Files.isDirectory(path)) {
           FileUtils.copyDirectory(oldFile, newFile)
         } else {
@@ -209,81 +228,80 @@ object OcelotDesktop extends Logging {
         }
       }
 
-      workspace.path = newPath
+      workspace.path = outputPath
     }
 
-    val path = newPath + "/workspace.nbt"
-    val writer = new DataOutputStream(new FileOutputStream(path))
-    val nbt = new NBTTagCompound
-    saveWorld(nbt)
-    CompressedStreamTools.writeCompressed(nbt, writer)
-    writer.flush()
-    logger.info(s"Saved workspace to: $newPath")
+    val path = outputPath + "/workspace.nbt"
+
+    Using.resource(new DataOutputStream(new FileOutputStream(path))) { writer =>
+      val nbt = new NBTTagCompound
+      saveWorld(nbt)
+      CompressedStreamTools.writeCompressed(nbt, writer)
+    }
+
+    logger.info(s"Saved workspace to: $outputPath")
   }
 
-  def saveAs(): Unit = {
-    showFileChooserDialog(
-      dir => Try {
-        if (dir.isEmpty)
-          return
+  def save(continuation: => Unit): Unit = savePath match {
+    case Some(savePath) =>
+      saveTo(savePath)
+      continuation
 
-        savePath = dir.map(_.toPath)
-        Settings.get.recentWorkspace = dir.map(_.getCanonicalPath)
-        save()
-      },
-      JFileChooser.SAVE_DIALOG,
-      JFileChooser.DIRECTORIES_ONLY
-    )
+    case None => showSaveDialog(continuation)
   }
 
-  def open(): Unit = {
-    showFileChooserDialog({
+  def saveAs(): Unit = showSaveDialog()
+
+  def showOpenDialog(): Unit =
+    showFileChooserDialog(JFileChooser.OPEN_DIALOG, JFileChooser.DIRECTORIES_ONLY) {
       case Some(dir) => load(dir)
       case None => Success(())
-    }, JFileChooser.OPEN_DIALOG, JFileChooser.DIRECTORIES_ONLY)
-  }
+    }
 
   def load(dir: File): Try[Unit] = {
     val path = Paths.get(dir.getCanonicalPath, "workspace.nbt")
     if (Files.exists(path)) {
       Try {
-        val reader = new DataInputStream(Files.newInputStream(path))
-        val nbt = CompressedStreamTools.readCompressed(reader)
-        savePath = Some(dir.toPath)
-        Settings.get.recentWorkspace = Some(dir.getCanonicalPath)
-        workspace.path = dir.toPath
-        loadWorld(nbt)
+        Using.resource(new DataInputStream(Files.newInputStream(path))) { reader =>
+          val nbt = CompressedStreamTools.readCompressed(reader)
+          savePath = Some(dir.toPath)
+          Settings.get.recentWorkspace = Some(dir.getCanonicalPath)
+          workspace.path = dir.toPath
+          loadWorld(nbt)
+        }
       }
     } else Failure(new FileNotFoundException("Specified directory does not contain 'workspace.nbt'"))
   }
 
-  def showFileChooserDialog(fun: Option[File] => Try[Unit], dialogType: Int, selectionMode: Int): Unit = {
+  def showFileChooserDialog(dialogType: Int, selectionMode: Int)(f: Option[File] => Try[Unit]): Unit = {
     new Thread(() => {
       val lastFile = savePath.map(_.toFile).orNull
-      val chooser: JFileChooser = try {
-        new NativeJFileChooser(lastFile)
-      } catch {
-        case _: Throwable => new JFileChooser(lastFile)
-      }
+      val chooser: JFileChooser = Option.when(Settings.get.useNativeFileChooser) {
+        Try(new NativeJFileChooser(lastFile)).toOption
+      }.flatten.getOrElse(
+        new JFileChooser(lastFile)
+      )
 
       chooser.setFileSelectionMode(selectionMode)
       chooser.setDialogType(dialogType)
 
-      val option = chooser.showDialog(null, null)
+      val selectedFile =
+        Option.when(chooser.showDialog(null, null) == JFileChooser.APPROVE_OPTION)(chooser.getSelectedFile)
+      val result = f(selectedFile)
 
-      val result = fun(if (option == JFileChooser.APPROVE_OPTION) Some(chooser.getSelectedFile) else None)
       result match {
         case Failure(exception) =>
           new NotificationDialog(s"Something went wrong!\n($exception)\nCheck the log file for a full stacktrace.",
             NotificationType.Error)
             .addCloseButton()
             .show()
+
         case Success(_) =>
       }
     }).start()
   }
 
-  def addPlayerDialog(): Unit = new InputDialog(
+  def showAddPlayerDialog(): Unit = new InputDialog(
     "Add new player",
     text => OcelotDesktop.selectPlayer(text)
   ).show()
@@ -307,54 +325,10 @@ object OcelotDesktop extends Logging {
     }
   }
 
-  def settings(): Unit = {
-    new SettingsDialog().show()
-  }
+  def showSettings(): Unit = new SettingsDialog().show()
 
-  private def cleanup(): Unit = {
-    FileUtils.deleteDirectory(tmpPath.toFile)
-  }
-
-  def exit(): Unit = {
-    if (UiHandler.root.modalDialogPool.children.exists(_.isInstanceOf[ExitConfirmationDialog]))
-      return
-
-    if (Settings.get.saveOnExit && savePath.isDefined) {
-      save()
-      UiHandler.exit()
-      cleanup()
-      return
-    }
-
-    new ExitConfirmationDialog {
-      override def onSaveSelected(): Unit = {
-        if (savePath.isDefined) {
-          save()
-          UiHandler.exit()
-          cleanup()
-        } else {
-          showFileChooserDialog(
-            dir => Try {
-              if (dir.isEmpty)
-                return
-
-              savePath = dir.map(_.toPath)
-              Settings.get.recentWorkspace = dir.map(_.getCanonicalPath)
-              save()
-              UiHandler.exit()
-              cleanup()
-            },
-            JFileChooser.SAVE_DIALOG,
-            JFileChooser.DIRECTORIES_ONLY
-          )
-        }
-      }
-
-      override def onExitSelected(): Unit = {
-        UiHandler.exit()
-        cleanup()
-      }
-    }.show()
+  def exit(): Unit = showCloseConfirmationDialog() {
+    UiHandler.exit()
   }
 
   var workspace: Workspace = _
@@ -362,4 +336,50 @@ object OcelotDesktop extends Logging {
   private def createWorkspace(): Unit = {
     workspace = new Workspace(tmpPath)
   }
+
+  private def showSaveDialog(continuation: => Unit): Unit =
+    showFileChooserDialog(JFileChooser.SAVE_DIALOG, JFileChooser.DIRECTORIES_ONLY) { dir =>
+      Try {
+        if (dir.nonEmpty) {
+          savePath = dir.map(_.toPath)
+          Settings.get.recentWorkspace = dir.map(_.getCanonicalPath)
+          save(continuation)
+        }
+      }
+    }
+
+  private def showCloseConfirmationDialog(prompt: Option[String])(continuation: => Unit): Unit = {
+    if (UiHandler.root.modalDialogPool.children.exists(_.isInstanceOf[CloseConfirmationDialog])) {
+      return
+    }
+
+    for (savePath <- savePath if Settings.get.saveOnExit) {
+      saveTo(savePath)
+      continuation
+
+      return
+    }
+
+    val prompt_ = prompt
+
+    new CloseConfirmationDialog {
+      override def prompt: String = prompt_.getOrElse(super.prompt)
+
+      override def onSaveSelected(): Unit = save {
+        close()
+        continuation
+      }
+
+      override def onNoSaveSelected(): Unit = {
+        close()
+        continuation
+      }
+    }.show()
+  }
+
+  private def showCloseConfirmationDialog(prompt: String)(continuation: => Unit): Unit =
+    showCloseConfirmationDialog(Some(prompt))(continuation)
+
+  private def showCloseConfirmationDialog()(continuation: => Unit): Unit =
+    showCloseConfirmationDialog(None)(continuation)
 }

src/main/scala/ocelot/desktop/Settings.scala

@@ -12,15 +12,23 @@ import java.util
 import scala.io.{Codec, Source}
 
 class Settings(val config: Config) extends SettingsData {
+  // TODO: refactor this mess (having to declare every field 3 times is extremely error-prone)
+
   volumeMaster = (config.getDouble("ocelot.sound.volumeMaster") max 0 min 1).toFloat
   volumeBeep = (config.getDouble("ocelot.sound.volumeBeep") max 0 min 1).toFloat
   volumeEnvironment = (config.getDouble("ocelot.sound.volumeEnvironment") max 0 min 1).toFloat
   volumeInterface = (if (config.hasPath("ocelot.sound.volumeInterface")) config.getDouble("ocelot.sound.volumeInterface") max 0 min 1 else 0.5).toFloat
+  audioDisable = config.getBooleanOrElse("ocelot.sound.audioDisable", default = false)
+  logAudioErrorStacktrace = config.getBooleanOrElse("ocelot.sound.logAudioErrorStacktrace", default = false)
 
+  scaleFactor = (if (config.hasPath("ocelot.window.scaleFactor")) config.getDouble("ocelot.window.scaleFactor") max 1 min 3 else 1).toFloat
   windowSize = config.getInt2D("ocelot.window.size")
   windowPosition = config.getInt2D("ocelot.window.position")
   windowValidatePosition = config.getBooleanOrElse("ocelot.window.validatePosition", default = true)
   windowFullscreen = config.getBooleanOrElse("ocelot.window.fullscreen", default = false)
+  disableVsync = config.getBooleanOrElse("ocelot.window.disableVsync", default = false)
+  debugLwjgl = config.getBooleanOrElse("ocelot.window.debugLwjgl", default = false)
+  useNativeFileChooser = config.getBooleanOrElse("ocelot.window.useNativeFileChooser", default = true)
 
   // Windows uses life-hack when it sets position to (-8,-8) for maximized windows to hide the frame.
   // (https://devblogs.microsoft.com/oldnewthing/20150304-00/?p=44543)
@@ -129,10 +137,16 @@ object Settings extends Logging {
         .withValuePreserveOrigin("ocelot.sound.volumeBeep", settings.volumeBeep)
         .withValuePreserveOrigin("ocelot.sound.volumeEnvironment", settings.volumeEnvironment)
         .withValuePreserveOrigin("ocelot.sound.volumeInterface", settings.volumeInterface)
+        .withValuePreserveOrigin("ocelot.sound.audioDisable", settings.audioDisable)
+        .withValuePreserveOrigin("ocelot.sound.logAudioErrorStacktrace", settings.logAudioErrorStacktrace)
+        .withValuePreserveOrigin("ocelot.window.scaleFactor", settings.scaleFactor.doubleValue)
         .withValue("ocelot.window.position", settings.windowPosition)
         .withValuePreserveOrigin("ocelot.window.validatePosition", settings.windowValidatePosition)
         .withValue("ocelot.window.size", settings.windowSize)
         .withValuePreserveOrigin("ocelot.window.fullscreen", settings.windowFullscreen)
+        .withValuePreserveOrigin("ocelot.window.disableVsync", settings.disableVsync)
+        .withValuePreserveOrigin("ocelot.window.debugLwjgl", settings.debugLwjgl)
+        .withValuePreserveOrigin("ocelot.window.useNativeFileChooser", settings.useNativeFileChooser)
         .withValue("ocelot.workspace.recent", settings.recentWorkspace)
         .withValuePreserveOrigin("ocelot.workspace.stickyWindows", settings.stickyWindows)
         .withValuePreserveOrigin("ocelot.workspace.saveOnExit", settings.saveOnExit)

src/main/scala/ocelot/desktop/audio/AL10W.scala

@@ -1,6 +1,7 @@
 package ocelot.desktop.audio
 
-import ocelot.desktop.util.Logging
+import ocelot.desktop.Settings
+import ocelot.desktop.util.{Logging, OpenAlException}
 import org.lwjgl.openal.AL10
 
 import java.nio.{ByteBuffer, IntBuffer}
@@ -17,71 +18,97 @@ object AL10W extends Logging {
           case _: Exception => false
         }
       }).map(_.getName).getOrElse(err.toHexString)
-      logger.error(s"OpenAL error: ${func}: ${errName}")
+      val exc = OpenAlException(func, errName, err)
+
+      if (Settings.get.logAudioErrorStacktrace) {
+        logger.error(exc)
+      } else {
+        logger.error(exc.getMessage)
+      }
+
+      throw exc
     }
+
     res
   }
 
-  def alIsExtensionPresent(name: String): Boolean = run("alIsExtensionPresent") {
-    AL10.alIsExtensionPresent(name)
+  def alIsExtensionPresent(name: String): Boolean = OpenAlException.defaulting(false) {
+    run("alIsExtensionPresent") {
+      AL10.alIsExtensionPresent(name)
+    }
   }
 
+  @throws[OpenAlException]
   def alGenBuffers(): Int = run("alGenBuffers") {
     AL10.alGenBuffers()
   }
 
+  @throws[OpenAlException]
   def alBufferData(buffer: Int, format: Int, data: ByteBuffer, freq: Int): Unit = run("alBufferData") {
     AL10.alBufferData(buffer, format, data, freq)
   }
 
+  @throws[OpenAlException]
   def alGetBufferi(buffer: Int, pname: Int): Int = run("alGetBufferi") {
     AL10.alGetBufferi(buffer, pname)
   }
 
+  @throws[OpenAlException]
   def alDeleteBuffers(buffer: Int): Unit = run("alDeleteBuffers") {
     AL10.alDeleteBuffers(buffer)
   }
 
+  @throws[OpenAlException]
   def alGenSources(): Int = run("alGenSources") {
     AL10.alGenSources()
   }
 
+  @throws[OpenAlException]
   def alSourceQueueBuffers(source: Int, buffer: Int): Unit = run("alSourceQueueBuffers") {
     AL10.alSourceQueueBuffers(source, buffer)
   }
 
+  @throws[OpenAlException]
   def alSourceUnqueueBuffers(source: Int, buffers: IntBuffer): Unit = run("alSourceUnqueueBuffers") {
     AL10.alSourceUnqueueBuffers(source, buffers)
   }
 
+  @throws[OpenAlException]
   def alGetSourcei(source: Int, pname: Int): Int = run("alGetSourcei") {
     AL10.alGetSourcei(source, pname)
   }
 
+  @throws[OpenAlException]
   def alSourcei(source: Int, pname: Int, value: Int): Unit = run("alSourcei") {
     AL10.alSourcei(source, pname, value)
   }
 
+  @throws[OpenAlException]
   def alSourcef(source: Int, pname: Int, value: Float): Unit = run("alSourcef") {
     AL10.alSourcef(source, pname, value)
   }
 
+  @throws[OpenAlException]
   def alSource3f(source: Int, pname: Int, v1: Float, v2: Float, v3: Float): Unit = run("alSource3f") {
     AL10.alSource3f(source, pname, v1, v2, v3)
   }
 
+  @throws[OpenAlException]
   def alSourcePlay(source: Int): Unit = run("alSourcePlay") {
     AL10.alSourcePlay(source)
   }
 
+  @throws[OpenAlException]
   def alSourcePause(source: Int): Unit = run("alSourcePause") {
     AL10.alSourcePause(source)
   }
 
+  @throws[OpenAlException]
   def alSourceStop(source: Int): Unit = run("alSourceStop") {
     AL10.alSourceStop(source)
   }
 
+  @throws[OpenAlException]
   def alDeleteSources(source: Int): Unit = run("alDeleteSources") {
     AL10.alDeleteSources(source)
   }

src/main/scala/ocelot/desktop/audio/Audio.scala

@@ -1,12 +1,13 @@
 package ocelot.desktop.audio
 
 import ocelot.desktop.Settings
-import ocelot.desktop.util.Logging
+import ocelot.desktop.util.{Logging, OpenAlException, Transaction}
 import org.lwjgl.LWJGLException
 import org.lwjgl.openal.{AL, AL10, ALC10}
 
 import java.nio.{ByteBuffer, ByteOrder}
 import scala.collection.mutable
+import scala.util.control.Exception.catching
 
 object Audio extends Logging {
   val sampleRate: Int = 44100
@@ -35,32 +36,52 @@ object Audio extends Logging {
     sources.size
   }
 
-  def newStream(soundCategory: SoundCategory.Value, pitch: Float = 1f,
-                volume: Float = 1f): (SoundStream, SoundSource) =
-  {
+  def newStream(
+    soundCategory: SoundCategory.Value,
+    pitch: Float = 1f,
+    volume: Float = 1f
+  ): (SoundStream, SoundSource) = {
     var source: SoundSource = null
 
     val stream = new SoundStream {
       override def enqueue(samples: SoundSamples): Unit = Audio.synchronized {
-        val sourceId = if (sources.contains(source)) {
-          sources(source)
-        } else {
-          val sourceId = AL10W.alGenSources()
+        OpenAlException.ignoring {
+          Transaction.runAbortable { tx =>
+            if (!Audio.isDisabled) {
+              val sourceId = if (sources.contains(source)) {
+                sources(source)
+              } else {
+                Transaction.run { tx =>
+                  val sourceId = AL10W.alGenSources()
+                  tx.onFailure {
+                    AL10W.alDeleteSources(sourceId)
+                  }
 
-          AL10W.alSourcef(sourceId, AL10.AL_PITCH, source.pitch)
-          AL10W.alSource3f(sourceId, AL10.AL_POSITION, 0f, 0f, 0f)
-          AL10W.alSourcef(sourceId, AL10.AL_GAIN, source.volume * SoundCategory.getSettingsValue(source.soundCategory) * Settings.get.volumeMaster)
-          sources.put(source, sourceId)
+                  AL10W.alSourcef(sourceId, AL10.AL_PITCH, source.pitch)
+                  AL10W.alSource3f(sourceId, AL10.AL_POSITION, 0f, 0f, 0f)
+                  AL10W.alSourcef(
+                    sourceId,
+                    AL10.AL_GAIN,
+                    source.volume * SoundCategory.getSettingsValue(source.soundCategory) * Settings.get.volumeMaster
+                  )
+                  sources.put(source, sourceId)
 
-          sourceId
+                  sourceId
+                }
+              }
+
+              cleanupSourceBuffers(sourceId)
+
+              val bufferId = samples.genBuffer().getOrElse { tx.abort() }
+              tx.onFailure { AL10W.alDeleteBuffers(bufferId) }
+              AL10W.alSourceQueueBuffers(sourceId, bufferId)
+
+              if (AL10W.alGetSourcei(sourceId, AL10.AL_SOURCE_STATE) != AL10.AL_PLAYING) {
+                AL10W.alSourcePlay(sourceId)
+              }
+            }
+          }
         }
-
-        cleanupSourceBuffers(sourceId)
-
-        val bufferId = samples.genBuffer()
-        AL10W.alSourceQueueBuffers(sourceId, bufferId)
-        if (AL10W.alGetSourcei(sourceId, AL10.AL_SOURCE_STATE) != AL10.AL_PLAYING)
-          AL10W.alSourcePlay(sourceId)
       }
     }
 
@@ -73,56 +94,96 @@ object Audio extends Logging {
       return SoundSource.Status.Stopped
 
     val sourceId = sources(source)
-    AL10W.alGetSourcei(sourceId, AL10.AL_SOURCE_STATE) match {
-      case AL10.AL_PLAYING => SoundSource.Status.Playing
-      case AL10.AL_PAUSED => SoundSource.Status.Paused
+
+    catching(classOf[OpenAlException]) opt AL10W.alGetSourcei(sourceId, AL10.AL_SOURCE_STATE) match {
+      case Some(AL10.AL_PLAYING) => SoundSource.Status.Playing
+      case Some(AL10.AL_PAUSED) => SoundSource.Status.Paused
       case _ => SoundSource.Status.Stopped
     }
   }
 
   def playSource(source: SoundSource): Unit = synchronized {
-    if (getSourceStatus(source) == SoundSource.Status.Playing)
-      return
+    OpenAlException.ignoring {
+      if (Audio.isDisabled) {
+        return
+      }
 
-    if (sources.contains(source)) {
-      AL10W.alSourcePlay(sources(source))
-      return
+      if (getSourceStatus(source) == SoundSource.Status.Playing) {
+        return
+      }
+
+      if (sources.contains(source)) {
+        AL10W.alSourcePlay(sources(source))
+        return
+      }
+
+      Transaction.runAbortable { tx =>
+        val sourceId = AL10W.alGenSources()
+        tx.onFailure { AL10W.alDeleteSources(sourceId) }
+
+        source.kind match {
+          case SoundSource.KindSoundBuffer(buffer) =>
+            buffer.bufferId match {
+              case Some(bufferId) =>
+                AL10W.alSourcei(sourceId, AL10.AL_BUFFER, bufferId)
+
+              case None =>
+                logger.error(s"Called play on a SoundBuffer $buffer with bufferId = None")
+                tx.abort()
+            }
+
+          case SoundSource.KindSoundSamples(samples) =>
+            Transaction.run { innerTx =>
+              val bufferId = samples.genBuffer().getOrElse { tx.abort() }
+              innerTx.onFailure { AL10W.alDeleteBuffers(bufferId) }
+              AL10W.alSourceQueueBuffers(sourceId, bufferId)
+            }
+
+          case SoundSource.KindStream(_) =>
+        }
+
+        AL10W.alSourcef(sourceId, AL10.AL_PITCH, source.pitch)
+        AL10W.alSource3f(sourceId, AL10.AL_POSITION, 0f, 0f, 0f)
+        AL10W.alSourcei(sourceId, AL10.AL_LOOPING, if (source.looping) AL10.AL_TRUE else AL10.AL_FALSE)
+        AL10W.alSourcef(
+          sourceId,
+          AL10.AL_GAIN,
+          source.volume * SoundCategory.getSettingsValue(source.soundCategory) * Settings.get.volumeMaster
+        )
+        AL10W.alSourcePlay(sourceId)
+
+        sources.put(source, sourceId)
+      }
     }
-
-    val sourceId = AL10W.alGenSources()
-    source.kind match {
-      case SoundSource.KindSoundBuffer(buffer) =>
-        AL10W.alSourcei(sourceId, AL10.AL_BUFFER, buffer.bufferId)
-      case SoundSource.KindSoundSamples(samples) =>
-        val bufferId = samples.genBuffer()
-        if (bufferId != -1) AL10W.alSourceQueueBuffers(sourceId, bufferId)
-      case SoundSource.KindStream(_) =>
-    }
-
-    AL10W.alSourcef(sourceId, AL10.AL_PITCH, source.pitch)
-    AL10W.alSource3f(sourceId, AL10.AL_POSITION, 0f, 0f, 0f)
-    AL10W.alSourcei(sourceId, AL10.AL_LOOPING, if (source.looping) AL10.AL_TRUE else AL10.AL_FALSE)
-    AL10W.alSourcef(sourceId, AL10.AL_GAIN, source.volume * SoundCategory.getSettingsValue(source.soundCategory) * Settings.get.volumeMaster)
-    AL10W.alSourcePlay(sourceId)
-
-    sources.put(source, sourceId)
   }
 
   def pauseSource(source: SoundSource): Unit = synchronized {
-    if (getSourceStatus(source) == SoundSource.Status.Paused)
-      return
+    OpenAlException.ignoring {
+      if (Audio.isDisabled) {
+        return
+      }
 
-    if (sources.contains(source)) {
-      AL10W.alSourcePause(sources(source))
+      if (getSourceStatus(source) == SoundSource.Status.Paused)
+        return
+
+      if (sources.contains(source)) {
+        AL10W.alSourcePause(sources(source))
+      }
     }
   }
 
   def stopSource(source: SoundSource): Unit = synchronized {
-    if (getSourceStatus(source) == SoundSource.Status.Stopped)
-      return
+    OpenAlException.ignoring {
+      if (Audio.isDisabled) {
+        return
+      }
 
-    if (sources.contains(source)) {
-      AL10W.alSourceStop(sources(source))
+      if (getSourceStatus(source) == SoundSource.Status.Stopped)
+        return
+
+      if (sources.contains(source)) {
+        AL10W.alSourceStop(sources(source))
+      }
     }
   }
 
@@ -130,14 +191,21 @@ object Audio extends Logging {
     if (isDisabled) return
 
     sources.filterInPlace { case (source, sourceId) =>
-      cleanupSourceBuffers(sourceId)
+      OpenAlException.defaulting(false) {
+        cleanupSourceBuffers(sourceId)
 
-      AL10W.alSourcef(sourceId, AL10.AL_GAIN, source.volume * SoundCategory.getSettingsValue(source.soundCategory) * Settings.get.volumeMaster)
-      AL10W.alGetSourcei(sourceId, AL10.AL_SOURCE_STATE) match {
-        case AL10.AL_STOPPED =>
-          deleteSource(sourceId)
-          false
-        case _ => true
+        AL10W.alSourcef(
+          sourceId,
+          AL10.AL_GAIN,
+          source.volume * SoundCategory.getSettingsValue(source.soundCategory) * Settings.get.volumeMaster
+        )
+
+        AL10W.alGetSourcei(sourceId, AL10.AL_SOURCE_STATE) match {
+          case AL10.AL_STOPPED =>
+            deleteSource(sourceId)
+            false
+          case _ => true
+        }
       }
     }
   }
@@ -146,19 +214,24 @@ object Audio extends Logging {
     if (isDisabled) return
 
     for ((_, sourceId) <- sources) {
-      deleteSource(sourceId)
+      OpenAlException.ignoring {
+        deleteSource(sourceId)
+      }
     }
 
     sources.clear()
+    AL.destroy()
     _disabled = true
   }
 
+  @throws[OpenAlException]
   private def deleteSource(sourceId: Int): Unit = {
     AL10W.alSourceStop(sourceId)
     cleanupSourceBuffers(sourceId)
     AL10W.alDeleteSources(sourceId)
   }
 
+  @throws[OpenAlException]
   private def cleanupSourceBuffers(sourceId: Int): Unit = {
     val count = AL10W.alGetSourcei(sourceId, AL10.AL_BUFFERS_PROCESSED)
     if (count <= 0) return

src/main/scala/ocelot/desktop/audio/SoundBuffer.scala

@@ -1,27 +1,29 @@
 package ocelot.desktop.audio
 
-import ocelot.desktop.util.{FileUtils, Logging, Resource, ResourceManager}
+import ocelot.desktop.util.{FileUtils, Logging, OpenAlException, Resource}
 import org.lwjgl.openal.AL10
 
 class SoundBuffer(val file: String) extends Resource with Logging {
-  private var _bufferId: Int = -1
+  private var _bufferId: Option[Int] = None
 
-  ResourceManager.registerResource(this)
+  Audio.synchronized {
+    OpenAlException.ignoring {
+      if (!Audio.isDisabled) {
+        logger.debug(s"Loading sound buffer from '$file'...")
+        _bufferId = Some(AL10W.alGenBuffers())
 
-  override def initResource(): Unit = {
-    if (Audio.isDisabled)
-      return
-
-    logger.debug(s"Loading sound buffer from '$file'...")
-    _bufferId = AL10W.alGenBuffers()
-
-    if (AL10W.alIsExtensionPresent("AL_EXT_vorbis")) {
-      initWithExt()
-    } else {
-      initFallback()
+        if (AL10W.alIsExtensionPresent("AL_EXT_vorbis")) {
+          initWithExt()
+        } else {
+          initFallback()
+        }
+      } else {
+        logger.debug(s"Skipping loading sound buffer from '$file' because audio is not available")
+      }
     }
   }
 
+  @throws[OpenAlException]
   private def initWithExt(): Unit = {
     val fileBuffer = FileUtils.load(file)
     if (fileBuffer == null) {
@@ -29,40 +31,49 @@ class SoundBuffer(val file: String) extends Resource with Logging {
       return
     }
 
-    AL10W.alBufferData(bufferId, AL10.AL_FORMAT_VORBIS_EXT, fileBuffer, -1)
+    AL10W.alBufferData(bufferId.get, AL10.AL_FORMAT_VORBIS_EXT, fileBuffer, -1)
   }
 
+  @throws[OpenAlException]
   private def initFallback(): Unit = {
     val ogg = OggDecoder.decode(getClass.getResourceAsStream(file))
     _bufferId = ogg.genBuffer()
   }
 
-  def numSamples: Int = {
-    if (bufferId == -1) {
-      return 0
+  def numSamples: Int = bufferId match {
+    case Some(bufferId) =>
+      OpenAlException.defaulting(0) {
+        val sizeBytes = AL10W.alGetBufferi(bufferId, AL10.AL_SIZE)
+        val channels = AL10W.alGetBufferi(bufferId, AL10.AL_CHANNELS)
+        val bits = AL10W.alGetBufferi(bufferId, AL10.AL_BITS)
+
+      sizeBytes * 8 / channels / bits
     }
 
-    val sizeBytes = AL10W.alGetBufferi(bufferId, AL10.AL_SIZE)
-    val channels = AL10W.alGetBufferi(bufferId, AL10.AL_CHANNELS)
-    val bits = AL10W.alGetBufferi(bufferId, AL10.AL_BITS)
-
-    sizeBytes * 8 / channels / bits
+    case None => 0
   }
 
-  val sampleRate: Int = {
-    if (bufferId == -1) {
-      44100
-    } else {
-      AL10W.alGetBufferi(bufferId, AL10.AL_FREQUENCY)
-    }
+  val sampleRate: Int = bufferId match {
+    case Some(bufferId) =>
+      OpenAlException.defaulting(44100) {
+        Audio.synchronized {
+          AL10W.alGetBufferi(bufferId, AL10.AL_FREQUENCY)
+        }
+      }
+
+    case None => 44100
   }
 
-  def bufferId: Int = _bufferId
+  def bufferId: Option[Int] = _bufferId
 
-  def freeResource(): Unit = {
-    if (bufferId != -1) {
-      AL10W.alDeleteBuffers(bufferId)
-      logger.debug(s"Destroyed sound buffer (ID: $bufferId) loaded from $file")
+  override def freeResource(): Unit = {
+    super.freeResource()
+
+    bufferId.foreach { bufferId =>
+      OpenAlException.ignoring {
+        AL10W.alDeleteBuffers(bufferId)
+        logger.debug(s"Destroyed sound buffer (ID: $bufferId) loaded from $file")
+      }
     }
   }
 }

src/main/scala/ocelot/desktop/audio/SoundBuffers.scala

@@ -1,33 +1,51 @@
 package ocelot.desktop.audio
 
-object SoundBuffers {
-  val MachineComputerRunning = new SoundBuffer("/ocelot/desktop/sounds/machine/computer_running.ogg")
-  val MachineFloppyAccess: Array[SoundBuffer] = Array(
-    new SoundBuffer("/ocelot/desktop/sounds/machine/floppy_access1.ogg"),
-    new SoundBuffer("/ocelot/desktop/sounds/machine/floppy_access2.ogg"),
-    new SoundBuffer("/ocelot/desktop/sounds/machine/floppy_access3.ogg"),
-    new SoundBuffer("/ocelot/desktop/sounds/machine/floppy_access4.ogg"),
-    new SoundBuffer("/ocelot/desktop/sounds/machine/floppy_access5.ogg"),
-    new SoundBuffer("/ocelot/desktop/sounds/machine/floppy_access6.ogg"),
-  )
-  val MachineFloppyEject = new SoundBuffer("/ocelot/desktop/sounds/machine/floppy_eject.ogg")
-  val MachineFloppyInsert = new SoundBuffer("/ocelot/desktop/sounds/machine/floppy_insert.ogg")
-  val MachineHDDAccess: Array[SoundBuffer] = Array(
-    new SoundBuffer("/ocelot/desktop/sounds/machine/hdd_access1.ogg"),
-    new SoundBuffer("/ocelot/desktop/sounds/machine/hdd_access2.ogg"),
-    new SoundBuffer("/ocelot/desktop/sounds/machine/hdd_access3.ogg"),
-    new SoundBuffer("/ocelot/desktop/sounds/machine/hdd_access4.ogg"),
-    new SoundBuffer("/ocelot/desktop/sounds/machine/hdd_access5.ogg"),
-    new SoundBuffer("/ocelot/desktop/sounds/machine/hdd_access6.ogg"),
-  )
-  val InterfaceClick = new SoundBuffer("/ocelot/desktop/sounds/interface/click.ogg")
-  val InterfaceTick = new SoundBuffer("/ocelot/desktop/sounds/interface/tick.ogg")
-  val MinecraftClick = new SoundBuffer("/ocelot/desktop/sounds/minecraft/click.ogg")
+import ocelot.desktop.util.Resource
 
-  val NoteBlock: Map[String, SoundBuffer] = List(
+import scala.collection.mutable.ArrayBuffer
+
+object SoundBuffers extends Resource {
+  lazy val MachineComputerRunning: SoundBuffer = load("/ocelot/desktop/sounds/machine/computer_running.ogg")
+  lazy val MachineFloppyAccess: Array[SoundBuffer] = Array(
+    load("/ocelot/desktop/sounds/machine/floppy_access1.ogg"),
+    load("/ocelot/desktop/sounds/machine/floppy_access2.ogg"),
+    load("/ocelot/desktop/sounds/machine/floppy_access3.ogg"),
+    load("/ocelot/desktop/sounds/machine/floppy_access4.ogg"),
+    load("/ocelot/desktop/sounds/machine/floppy_access5.ogg"),
+    load("/ocelot/desktop/sounds/machine/floppy_access6.ogg"),
+  )
+  lazy val MachineFloppyEject: SoundBuffer = load("/ocelot/desktop/sounds/machine/floppy_eject.ogg")
+  lazy val MachineFloppyInsert: SoundBuffer = load("/ocelot/desktop/sounds/machine/floppy_insert.ogg")
+  lazy val MachineHDDAccess: Array[SoundBuffer] = Array(
+    load("/ocelot/desktop/sounds/machine/hdd_access1.ogg"),
+    load("/ocelot/desktop/sounds/machine/hdd_access2.ogg"),
+    load("/ocelot/desktop/sounds/machine/hdd_access3.ogg"),
+    load("/ocelot/desktop/sounds/machine/hdd_access4.ogg"),
+    load("/ocelot/desktop/sounds/machine/hdd_access5.ogg"),
+    load("/ocelot/desktop/sounds/machine/hdd_access6.ogg"),
+  )
+  lazy val InterfaceClick: SoundBuffer = load("/ocelot/desktop/sounds/interface/click.ogg")
+  lazy val InterfaceTick: SoundBuffer = load("/ocelot/desktop/sounds/interface/tick.ogg")
+  lazy val MinecraftClick: SoundBuffer = load("/ocelot/desktop/sounds/minecraft/click.ogg")
+  lazy val MinecraftExplosion: SoundBuffer = load("/ocelot/desktop/sounds/minecraft/explosion.ogg")
+
+  lazy val NoteBlock: Map[String, SoundBuffer] = List(
     "banjo", "basedrum", "bass", "bell", "bit", "chime", "cow_bell", "didgeridoo", "flute", "guitar",
     "harp", "hat", "iron_xylophone", "pling", "snare", "xylophone"
   ).map(name => {
-    (name, new SoundBuffer(s"/ocelot/desktop/sounds/minecraft/note_block/$name.ogg"))
+    (name, load(s"/ocelot/desktop/sounds/minecraft/note_block/$name.ogg"))
   }).toMap
+
+  private val loaded = new ArrayBuffer[SoundBuffer]()
+
+  private def load(file: String): SoundBuffer = {
+    val buffer = new SoundBuffer(file)
+    loaded.append(buffer)
+    buffer
+  }
+
+  override def freeResource(): Unit = {
+    super.freeResource()
+    loaded.foreach(_.freeResource())
+  }
 }

src/main/scala/ocelot/desktop/audio/SoundSamples.scala

@@ -1,24 +1,28 @@
 package ocelot.desktop.audio
 
-import ocelot.desktop.util.Logging
+import ocelot.desktop.util.{Logging, OpenAlException}
 import org.lwjgl.openal.AL10
 
 import java.nio.ByteBuffer
+import scala.util.control.Exception.catching
 
 case class SoundSamples(data: ByteBuffer, rate: Int, format: SoundSamples.Format.Value) extends Logging {
-  def genBuffer(): Int = {
-    val bufferId = AL10W.alGenBuffers()
-    val formatId = format match {
-      case SoundSamples.Format.Stereo16 => AL10.AL_FORMAT_STEREO16
-      case SoundSamples.Format.Mono16 => AL10.AL_FORMAT_MONO16
-      case SoundSamples.Format.Mono8 => AL10.AL_FORMAT_MONO8
+  def genBuffer(): Option[Int] = Audio.synchronized {
+    if (Audio.isDisabled) return None
+
+    catching(classOf[OpenAlException]) opt {
+      val bufferId = AL10W.alGenBuffers()
+      val formatId = format match {
+        case SoundSamples.Format.Stereo16 => AL10.AL_FORMAT_STEREO16
+        case SoundSamples.Format.Mono16 => AL10.AL_FORMAT_MONO16
+        case SoundSamples.Format.Mono8 => AL10.AL_FORMAT_MONO8
+      }
+
+      AL10W.alBufferData(bufferId, formatId, data, rate)
+
+      bufferId
     }
-
-    AL10W.alBufferData(bufferId, formatId, data, rate)
-    bufferId
   }
-
-
 }
 
 object SoundSamples {

src/main/scala/ocelot/desktop/audio/SoundSource.scala

@@ -1,6 +1,7 @@
 package ocelot.desktop.audio
 
-import java.time.Duration
+import java.util.concurrent.TimeUnit
+import scala.concurrent.duration.Duration
 
 class SoundSource(val kind: SoundSource.Kind,
                   val soundCategory: SoundCategory.Value,
@@ -8,20 +9,21 @@ class SoundSource(val kind: SoundSource.Kind,
                   val pitch: Float,
                   var volume: Float) {
 
-  def duration: Duration = {
-    val seconds = kind match {
-      case SoundSource.KindSoundBuffer(buffer) =>
-        buffer.numSamples.toFloat / buffer.sampleRate
-      case SoundSource.KindSoundSamples(SoundSamples(buffer, rate, format)) =>
-        val bps = format match {
-          case SoundSamples.Format.Stereo16 => 2
-          case SoundSamples.Format.Mono8 => 1
-          case SoundSamples.Format.Mono16 => 2
-        }
-        buffer.limit().toFloat / (rate * bps)
-    }
+  def duration: Option[Duration] = kind match {
+    case SoundSource.KindSoundBuffer(buffer) =>
+      Some(Duration(buffer.numSamples.toFloat / buffer.sampleRate, TimeUnit.SECONDS))
 
-    Duration.ofNanos((seconds * 1e9).toLong)
+    case SoundSource.KindSoundSamples(SoundSamples(buffer, rate, format)) =>
+      val bps = format match {
+        case SoundSamples.Format.Stereo16 => 2
+        case SoundSamples.Format.Mono8 => 1
+        case SoundSamples.Format.Mono16 => 2
+      }
+
+      Some(Duration(buffer.limit().toFloat / (rate * bps), TimeUnit.SECONDS))
+
+    case SoundSource.KindStream(_) =>
+      None
   }
 
   def status: SoundSource.Status.Value = {
@@ -73,8 +75,7 @@ object SoundSource {
   }
 
   def fromStream(stream: SoundStream, soundCategory: SoundCategory.Value,
-                 looping: Boolean = false, pitch: Float = 1f, volume: Float = 1f): SoundSource =
-  {
+                 looping: Boolean = false, pitch: Float = 1f, volume: Float = 1f): SoundSource = {
     new SoundSource(SoundSource.KindStream(stream), soundCategory, looping, pitch, volume)
   }
 

src/main/scala/ocelot/desktop/audio/SoundSources.scala

@@ -7,4 +7,5 @@ object SoundSources {
   val InterfaceTick = SoundSource.fromBuffer(SoundBuffers.InterfaceTick, SoundCategory.Interface)
 
   val MinecraftClick = SoundSource.fromBuffer(SoundBuffers.MinecraftClick, SoundCategory.Interface)
+  val MinecraftExplosion = SoundSource.fromBuffer(SoundBuffers.MinecraftExplosion, SoundCategory.Environment)
 }

src/main/scala/ocelot/desktop/entity/Camera.scala

@@ -2,19 +2,15 @@ package ocelot.desktop.entity
 
 import ocelot.desktop.util.WebcamCapture
 import totoro.ocelot.brain.Constants
-import totoro.ocelot.brain.entity.machine.{Arguments, Callback, Context}
+import totoro.ocelot.brain.entity.machine.{Arguments, Context}
 import totoro.ocelot.brain.entity.traits.DeviceInfo.{DeviceAttribute, DeviceClass}
 import totoro.ocelot.brain.entity.traits.{DeviceInfo, Entity, GenericCamera}
 import totoro.ocelot.brain.nbt.NBTTagCompound
 import totoro.ocelot.brain.util.ResultWrapper.result
 import totoro.ocelot.brain.workspace.Workspace
 
-object Camera {
-  private val DistanceCallCost = 20
-}
-
 class Camera extends Entity with GenericCamera with DeviceInfo {
-  var webcamCapture: WebcamCapture = WebcamCapture.getDefault
+  var webcamCapture: Option[WebcamCapture] = WebcamCapture.getDefault
   var flipHorizontally: Boolean = false
   var flipVertically: Boolean = false
   var directCalls: Boolean = false
@@ -23,31 +19,38 @@ class Camera extends Entity with GenericCamera with DeviceInfo {
     if (!directCalls)
       context.consumeCallBudget(1.0 / Camera.DistanceCallCost)
 
-    var x: Float = 0f
-    var y: Float = 0f
-    if (args.count() == 2) {
-      // [-1; 1] => [0; 1]
-      x = (args.checkDouble(0).toFloat + 1f) / 2f
-      y = (args.checkDouble(1).toFloat + 1f) / 2f
-    }
+    result(webcamCapture match {
+      case Some(webcamCapture) =>
+        var x: Float = 0f
+        var y: Float = 0f
 
-    if (!flipHorizontally) x = 1f - x
-    if (!flipVertically) y = 1f - y
-    result(webcamCapture.ray(x, y))
+        if (args.count() == 2) {
+          // [-1; 1] => [0; 1]
+          x = (args.checkDouble(0).toFloat + 1f) / 2f
+          y = (args.checkDouble(1).toFloat + 1f) / 2f
+        }
+
+        if (!flipHorizontally) x = 1f - x
+        if (!flipVertically) y = 1f - y
+
+        webcamCapture.ray(x, y)
+
+      case None => 0f
+    })
   }
 
   override def getDeviceInfo: Map[String, String] = Map(
     DeviceAttribute.Class -> DeviceClass.Multimedia,
     DeviceAttribute.Description -> "Dungeon Scanner 2.5D",
     DeviceAttribute.Vendor -> Constants.DeviceInfo.DefaultVendor,
-    DeviceAttribute.Product -> webcamCapture.name
+    DeviceAttribute.Product -> webcamCapture.map(_.name).getOrElse("Blind Pirate")
   )
 
   override def load(nbt: NBTTagCompound, workspace: Workspace): Unit = {
     super.load(nbt, workspace)
 
     if (nbt.hasKey("device"))
-      webcamCapture = WebcamCapture.getInstance(nbt.getString("device"))
+      webcamCapture = WebcamCapture.getInstance(nbt.getString("device")).orElse(WebcamCapture.getDefault)
 
     if (nbt.hasKey("flipHorizontally"))
       flipHorizontally = nbt.getBoolean("flipHorizontally")
@@ -62,9 +65,13 @@ class Camera extends Entity with GenericCamera with DeviceInfo {
   override def save(nbt: NBTTagCompound): Unit = {
     super.save(nbt)
 
-    nbt.setString("device", webcamCapture.name)
+    webcamCapture.foreach(capture => nbt.setString("device", capture.name))
     nbt.setBoolean("flipHorizontally", flipHorizontally)
     nbt.setBoolean("flipVertically", flipVertically)
     nbt.setBoolean("directCalls", directCalls)
   }
 }
+
+object Camera {
+  private val DistanceCallCost = 20
+}

src/main/scala/ocelot/desktop/entity/OpenFMRadio.scala

@@ -5,7 +5,6 @@ import ocelot.desktop.audio.{Audio, SoundCategory, SoundSamples, SoundSource}
 import ocelot.desktop.color.IntColor
 import ocelot.desktop.util.Logging
 import org.lwjgl.BufferUtils
-import totoro.ocelot.brain.Ocelot.logger
 import totoro.ocelot.brain.entity.machine.{Arguments, Callback, Context}
 import totoro.ocelot.brain.entity.traits.{DeviceInfo, Entity, Environment}
 import totoro.ocelot.brain.nbt.NBTTagCompound
@@ -21,7 +20,8 @@ import javax.sound.sampled.{AudioFormat, AudioSystem}
 
 class OpenFMRadio extends Entity with Environment with DeviceInfo with Logging {
   override val node: Component =
-    Network.newNode(this, Visibility.Network)
+    Network
+    .newNode(this, Visibility.Network)
     .withComponent("openfm_radio", Visibility.Network)
     .create()
 
@@ -105,22 +105,13 @@ class OpenFMRadio extends Entity with Environment with DeviceInfo with Logging {
 
         bytesRead = inputStream.read(buffer, 0, buffer.length)
       }
+
+      logger.info("OpenFM input audio stream has reached EOF, closing thread")
     }
     catch {
       case _: InterruptedException =>
       case e: Exception => logger.error("OpenFM playback exception", e)
     }
-
-    // Stopping playback and cleaning up resources after exit from read loop
-    this.synchronized {
-      if (playbackSoundSource.isDefined) {
-        playbackSoundSource.get.stop()
-        playbackSoundSource = None
-      }
-
-      if (playbackThread.isDefined)
-        playbackThread = None
-    }
   }
 
   def play(): Boolean = {
@@ -139,24 +130,35 @@ class OpenFMRadio extends Entity with Environment with DeviceInfo with Logging {
     true
   }
 
-  def stop(): Boolean = {
+  def stop(): Unit = {
     this.synchronized {
-      if (playbackThread.isDefined)
+      // Stopping reading data from url
+      if (playbackThread.isDefined) {
         playbackThread.get.interrupt()
-    }
+        playbackThread = None
+      }
 
-    true
+      // Stopping playback
+      if (playbackSoundSource.isDefined) {
+        playbackSoundSource.get.stop()
+        playbackSoundSource = None
+      }
+    }
   }
 
-  def isPlaying: Boolean = playbackThread.isDefined
+  def isPlaying: Boolean =
+    playbackSoundSource.isDefined && playbackSoundSource.get.isPlaying || playbackThread.isDefined
 
   @Callback()
   def start(context: Context, args: Arguments): Array[AnyRef] =
     result(play())
 
   @Callback()
-  def stop(context: Context, args: Arguments): Array[AnyRef] =
-    result(stop())
+  def stop(context: Context, args: Arguments): Array[AnyRef] = {
+    stop()
+
+    result(true)
+  }
 
   @Callback()
   def isPlaying(context: Context, args: Arguments): Array[AnyRef] =

src/main/scala/ocelot/desktop/geometry/Rect2D.scala

@@ -8,9 +8,9 @@ object Rect2D {
 
 //noinspection ScalaWeakerAccess,ScalaUnusedSymbol
 case class Rect2D(x: Float, y: Float, w: Float, h: Float) {
-  def contains(p: Vector2D): Boolean = p.x >= x && p.y >= y && p.x <= x + w && p.y <= y + h
+  def contains(p: Vector2D): Boolean = p.x >= x && p.y >= y && p.x < x + w && p.y < y + h
 
-  def contains(r: Rect2D): Boolean = r.x >= x && r.y >= y && r.x + r.w <= x + w && r.y + r.h <= y + h
+  def contains(r: Rect2D): Boolean = r.x >= x && r.y >= y && r.x + r.w < x + w && r.y + r.h < y + h
 
   def origin: Vector2D = Vector2D(x, y)
 

src/main/scala/ocelot/desktop/graphics/Graphics.scala

@@ -13,7 +13,7 @@ import scala.collection.mutable
 import scala.util.control.Breaks._
 
 //noinspection ScalaWeakerAccess,ScalaUnusedSymbol
-class Graphics extends Logging with Resource {
+class Graphics(private var scalingFactor: Float) extends Logging with Resource {
   private var time = 0f
 
   private var projection = Transform2D.viewport(800, 600)
@@ -29,6 +29,7 @@ class Graphics extends Logging with Resource {
   private var oldFont: Font = _font
 
   private val stack = mutable.Stack[GraphicsState](GraphicsState())
+
   private var spriteRect = Spritesheet.sprites("Empty")
   private val emptySpriteTrans = Transform2D.translate(spriteRect.x, spriteRect.y) >> Transform2D.scale(spriteRect.w, spriteRect.h)
 
@@ -43,16 +44,43 @@ class Graphics extends Logging with Resource {
   shaderProgram.set("uTexture", 0)
   shaderProgram.set("uTextTexture", 1)
 
-  def resize(width: Int, height: Int): Unit = {
-    offscreenTexture.bind()
-    GL11.glTexImage2D(GL11.GL_TEXTURE_2D, 0, GL11.GL_RGB, width, height, 0, GL11.GL_RGB,
-      GL11.GL_UNSIGNED_BYTE, null.asInstanceOf[ByteBuffer])
-    GL11.glViewport(0, 0, width, height)
+  scale(scalingFactor)
+
+  def resize(width: Int, height: Int, scaling: Float): Boolean = {
+    var viewportChanged = false
+
+    if (scaling != scalingFactor) {
+      scalingFactor = scaling
+      stack.last.transform = Transform2D.scale(scalingFactor)
+      viewportChanged = true
+    }
+
+    if (this.width != width || this.height != height) {
+      this.width = width
+      this.height = height
+
+      offscreenTexture.bind()
+      GL11.glTexImage2D(GL11.GL_TEXTURE_2D, 0, GL11.GL_RGB, width, height, 0, GL11.GL_RGB,
+        GL11.GL_UNSIGNED_BYTE, null.asInstanceOf[ByteBuffer])
+      GL11.glViewport(0, 0, width, height)
+
+      viewportChanged = true
+    }
+    viewportChanged
   }
 
   override def freeResource(): Unit = {
-    logger.debug(s"Destroyed FBO (ID: $offscreenFramebuffer)")
+    super.freeResource()
+
     GL30.glDeleteFramebuffers(offscreenFramebuffer)
+    logger.debug(s"Destroyed FBO (ID: $offscreenFramebuffer)")
+
+    offscreenTexture.freeResource()
+    Spritesheet.freeResource()
+    smallFont.freeResource()
+    normalFont.freeResource()
+    renderer.freeResource()
+    shaderProgram.freeResource()
   }
 
   def font: Font = _font
@@ -106,16 +134,13 @@ class Graphics extends Logging with Resource {
     offscreenTexture.bind()
     foreground = RGBAColorNorm(1, 1, 1, alpha)
     spriteRect = Rect2D(0, 1f, 1f, -1f)
-    _rect(0, 0, width, height, fixUV = false)
+
+    _rect(0, 0, width / scalingFactor, height / scalingFactor, fixUV = false)
     renderer.flush()
   }
 
-  def setViewport(width: Int, height: Int): Unit = {
-    projection = Transform2D.viewport(width, height)
-    this.width = width
-    this.height = height
-
-    shaderProgram.set("uProj", projection)
+  def startViewport(): Unit = {
+    shaderProgram.set("uProj", Transform2D.viewport(width, height))
   }
 
   def clear(): Unit = {
@@ -124,16 +149,19 @@ class Graphics extends Logging with Resource {
     GL11.glClear(GL11.GL_COLOR_BUFFER_BIT)
   }
 
-  def setScissor(x: Int, y: Int, width: Int, height: Int): Unit = {
+  def setScissor(x: Float, y: Float, width: Float, height: Float): Unit = {
     flush()
-    stack.head.scissor = Some((x, y, width, height))
-    GL11.glScissor(x, this.height - height - y, width, height)
+    stack.head.scissor = Some((x, y, width * scalingFactor, height * scalingFactor))
+    // TODO: make them aware of the transform stack
+    GL11.glScissor(
+      Math.round(x * scalingFactor),
+      Math.round(this.height - height * scalingFactor - y * scalingFactor),
+      Math.round(width * scalingFactor),
+      Math.round(height * scalingFactor)
+    )
     GL11.glEnable(GL11.GL_SCISSOR_TEST)
   }
 
-  def setScissor(x: Float, y: Float, width: Float, height: Float): Unit = {
-    setScissor(x.round, y.round, width.round, height.round)
-  }
 
   def setScissor(): Unit = {
     flush()
@@ -207,7 +235,7 @@ class Graphics extends Logging with Resource {
     }
   }
 
-  def char(_x: Float, _y: Float, c: Char, scaleX: Float = 1f, scaleY: Float = 1f): Unit = {
+  def char(_x: Float, _y: Float, c: Int, scaleX: Float = 1f, scaleY: Float = 1f): Unit = {
     val fontSize = fontSizeMultiplier * _font.fontSize
     val x = _x.round
     val y = _y.round

src/main/scala/ocelot/desktop/graphics/GraphicsState.scala

@@ -9,6 +9,6 @@ case class GraphicsState(
   var fontSizeMultiplier: Float = 1f,
   var alphaMultiplier: Float = 1f,
   var sprite: String = "Empty",
-  var scissor: Option[(Int, Int, Int, Int)] = None,
+  var scissor: Option[(Float, Float, Float, Float)] = None,
   var transform: Transform2D = Transform2D.identity
 )

src/main/scala/ocelot/desktop/graphics/Icons.scala

@@ -0,0 +1,96 @@
+package ocelot.desktop.graphics
+
+import ocelot.desktop.graphics.IconDef.Animation
+import ocelot.desktop.ui.widget.modal.notification.NotificationType.NotificationType
+import totoro.ocelot.brain.util.DyeColor
+import totoro.ocelot.brain.util.ExtendedTier.ExtendedTier
+import totoro.ocelot.brain.util.Tier.Tier
+
+object Icons {
+  // Icons
+  val CardIcon: IconDef = IconDef("icons/Card")
+  val CpuIcon: IconDef = IconDef("icons/CPU")
+  val HddIcon: IconDef = IconDef("icons/HDD")
+  val EepromIcon: IconDef = IconDef("icons/EEPROM")
+  val FloppyIcon: IconDef = IconDef("icons/Floppy")
+  val MemoryIcon: IconDef = IconDef("icons/Memory")
+
+  val TierIcon: Tier => IconDef = { tier =>
+    IconDef(s"icons/Tier${tier.id}")
+  }
+
+  val NotificationIcon: NotificationType => IconDef = { notificationType =>
+    IconDef(s"icons/Notification$notificationType", 4)
+  }
+
+  val SettingsSound: IconDef = IconDef("icons/SettingsSound")
+  val SettingsUI: IconDef = IconDef("icons/SettingsUI")
+
+  // Items
+  val Cpu: Tier => IconDef = { tier =>
+    IconDef(s"items/CPU${tier.id}")
+  }
+
+  val Apu: Tier => IconDef = { tier =>
+    IconDef(s"items/APU${tier.id}", animation = Some(Animations.Apu))
+  }
+
+  val GraphicsCard: Tier => IconDef = { tier =>
+    IconDef(s"items/GraphicsCard${tier.id}")
+  }
+
+  val NetworkCard: IconDef = IconDef("items/NetworkCard")
+
+  val WirelessNetworkCard: Tier => IconDef = { tier =>
+    IconDef(s"items/WirelessNetworkCard${tier.id}")
+  }
+
+  val LinkedCard: IconDef = IconDef("items/LinkedCard", animation = Some(Animations.LinkedCard))
+
+  val InternetCard: IconDef = IconDef("items/InternetCard", animation = Some(Animations.InternetCard))
+
+  val RedstoneCard: Tier => IconDef = { tier =>
+    IconDef(s"items/RedstoneCard${tier.id}")
+  }
+
+  val DataCard: Tier => IconDef = { tier =>
+    IconDef(s"items/DataCard${tier.id}", animation = Some(Animations.DataCard))
+  }
+
+  val SoundCard: IconDef = IconDef("items/SoundCard", animation = Some(Animations.DataCard))
+
+  val SelfDestructingCard: IconDef = IconDef("items/SelfDestructingCard", animation = Some(Animations.SelfDestructingCard))
+
+  val HardDiskDrive: Tier => IconDef = { tier =>
+    IconDef(s"items/HardDiskDrive${tier.id}")
+  }
+
+  val Eeprom: IconDef = IconDef("items/EEPROM")
+
+  val FloppyDisk: DyeColor => IconDef = { color =>
+    IconDef(s"items/FloppyDisk_${color.name}")
+  }
+
+  val Memory: ExtendedTier => IconDef = { tier =>
+    IconDef(s"items/Memory${tier.id}")
+  }
+
+  //noinspection ScalaWeakerAccess
+  object Animations {
+    val Apu: Animation = Array(
+      (0, 3f), (1, 3f), (2, 3f), (3, 3f), (4, 3f), (5, 3f),
+      (4, 3f), (3, 3f), (2, 3f), (1, 3f), (0, 3f))
+
+    val LinkedCard: Animation =
+      Array((0, 3f), (1, 3f), (2, 3f), (3, 3f), (4, 3f), (5, 3f))
+
+    val InternetCard: Animation = Array(
+      (0, 2f), (1, 7f), (0, 5f), (1, 4f), (0, 7f), (1, 2f), (0, 8f),
+      (1, 9f), (0, 6f), (1, 4f))
+
+    val DataCard: Animation = Array(
+      (0, 4f), (1, 4f), (2, 4f), (3, 4f), (4, 4f), (5, 4f), (6, 4f), (7, 4f))
+
+    val SelfDestructingCard: Animation = Array((0, 4f), (1, 4f))
+  }
+}

src/main/scala/ocelot/desktop/graphics/ShaderProgram.scala

@@ -1,7 +1,7 @@
 package ocelot.desktop.graphics
 
 import ocelot.desktop.geometry.Transform2D
-import ocelot.desktop.util.{Logging, Resource, ResourceManager}
+import ocelot.desktop.util.{Logging, Resource}
 import org.lwjgl.BufferUtils
 import org.lwjgl.opengl.GL20
 
@@ -34,13 +34,12 @@ class ShaderProgram(name: String) extends Logging with Resource {
     }
   }
 
-  ResourceManager.registerResource(this)
-
-  def freeResource(): Unit = {
-    logger.debug(s"Destroyed shader program ($name)")
+  override def freeResource(): Unit = {
+    super.freeResource()
     GL20.glDeleteProgram(shaderProgram)
     GL20.glDeleteShader(vertexShader)
     GL20.glDeleteShader(fragmentShader)
+    logger.debug(s"Destroyed shader program ($name)")
   }
 
   def bind(): Unit = {

src/main/scala/ocelot/desktop/graphics/Texture.scala

@@ -1,6 +1,6 @@
 package ocelot.desktop.graphics
 
-import ocelot.desktop.util.{Logging, Resource, ResourceManager}
+import ocelot.desktop.util.{Logging, Resource}
 import org.lwjgl.BufferUtils
 import org.lwjgl.opengl._
 
@@ -10,13 +10,6 @@ import java.nio.ByteBuffer
 class Texture extends Logging with Resource {
   val texture: Int = GL11.glGenTextures()
 
-  ResourceManager.registerResource(this)
-
-  def freeResource(): Unit = {
-    logger.debug(s"Destroyed texture (ID: $texture)")
-    GL11.glDeleteTextures(texture)
-  }
-
   bind()
   GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MIN_FILTER, GL11.GL_LINEAR)
   GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MAG_FILTER, GL11.GL_NEAREST)
@@ -75,4 +68,10 @@ class Texture extends Logging with Resource {
     GL13.glActiveTexture(GL13.GL_TEXTURE0 + unit)
     GL11.glBindTexture(GL11.GL_TEXTURE_2D, texture)
   }
+
+  override def freeResource(): Unit = {
+    super.freeResource()
+    GL11.glDeleteTextures(texture)
+    logger.debug(s"Destroyed texture (ID: $texture)")
+  }
 }

src/main/scala/ocelot/desktop/graphics/buffer/Buffer.scala

@@ -12,9 +12,10 @@ class Buffer[T <: BufferPut] extends Logging with Resource {
   var capacity: Int = _
   var stride: Int = _
 
-  def freeResource(): Unit = {
-    logger.debug(s"Destroyed buffer (ID: $buffer) of ${capacity * stride} bytes")
+  override def freeResource(): Unit = {
+    super.freeResource()
     GL15.glDeleteBuffers(buffer)
+    logger.debug(s"Destroyed buffer (ID: $buffer) of ${capacity * stride} bytes")
   }
 
   def this(elements: Seq[T]) = {

src/main/scala/ocelot/desktop/graphics/mesh/VertexArray.scala

@@ -2,7 +2,7 @@ package ocelot.desktop.graphics.mesh
 
 import ocelot.desktop.graphics.ShaderProgram
 import ocelot.desktop.graphics.buffer.{IndexBuffer, VertexBuffer}
-import ocelot.desktop.util.{Logging, Resource, ResourceManager}
+import ocelot.desktop.util.{Logging, Resource}
 import org.lwjgl.opengl._
 
 class VertexArray(shader: ShaderProgram) extends Logging with Resource {
@@ -13,16 +13,6 @@ class VertexArray(shader: ShaderProgram) extends Logging with Resource {
   else
     ARBVertexArrayObject.glGenVertexArrays()
 
-  ResourceManager.registerResource(this)
-
-  def freeResource(): Unit = {
-    logger.debug(s"Destroyed VAO (ID: $array)")
-    if (isMacOS)
-      APPLEVertexArrayObject.glDeleteVertexArraysAPPLE(array)
-    else
-      ARBVertexArrayObject.glDeleteVertexArrays(array)
-  }
-
   def addVertexBuffer[V <: Vertex](buffer: VertexBuffer[V], instanced: Boolean = false): Unit = {
     bind()
 
@@ -47,4 +37,13 @@ class VertexArray(shader: ShaderProgram) extends Logging with Resource {
     APPLEVertexArrayObject.glBindVertexArrayAPPLE(array)
   else
     ARBVertexArrayObject.glBindVertexArray(array)
+
+  override def freeResource(): Unit = {
+    super.freeResource()
+    if (isMacOS)
+      APPLEVertexArrayObject.glDeleteVertexArraysAPPLE(array)
+    else
+      ARBVertexArrayObject.glDeleteVertexArrays(array)
+    logger.debug(s"Destroyed VAO (ID: $array)")
+  }
 }

src/main/scala/ocelot/desktop/graphics/render/InstanceRenderer.scala

@@ -3,14 +3,14 @@ package ocelot.desktop.graphics.render
 import ocelot.desktop.graphics.ShaderProgram
 import ocelot.desktop.graphics.buffer.{IndexBuffer, VertexBuffer}
 import ocelot.desktop.graphics.mesh.{Mesh, MeshInstance, MeshVertex, VertexArray}
-import ocelot.desktop.util.Logging
+import ocelot.desktop.util.{Logging, Resource}
 import org.lwjgl.BufferUtils
 import org.lwjgl.opengl._
 
 import java.nio.ByteBuffer
 import scala.collection.mutable.ArrayBuffer
 
-class InstanceRenderer(mesh: Mesh, shader: ShaderProgram) extends Logging {
+class InstanceRenderer(mesh: Mesh, shader: ShaderProgram) extends Resource with Logging {
   private val InitialCapacity: Int = 4096
 
   private val vertexBuffer = new VertexBuffer[MeshVertex](mesh.vertices)
@@ -81,4 +81,12 @@ class InstanceRenderer(mesh: Mesh, shader: ShaderProgram) extends Logging {
     data.flip
     data
   }
+
+  override def freeResource(): Unit = {
+    super.freeResource()
+    vertexArray.freeResource()
+    instanceBuffer.freeResource()
+    indexBuffer.foreach(_.freeResource())
+    vertexBuffer.freeResource()
+  }
 }

src/main/scala/ocelot/desktop/inventory/Inventory.scala

@@ -0,0 +1,232 @@
+package ocelot.desktop.inventory
+
+import ocelot.desktop.inventory.Inventory.SlotObserver
+
+import scala.collection.mutable
+
+/**
+  * Provides an inventory — a collection of [[Item]]s indexed by slots.
+  */
+trait Inventory {
+  // parallels totoro.ocelot.brain.entity.traits.Inventory
+  // this is intentional
+
+  /**
+    * The type of items stored in this inventory.
+    */
+  type I <: Item
+
+  private type WeakHashSet[A] = mutable.WeakHashMap[A, Unit]
+
+  private val slotItems = mutable.HashMap.empty[Int, I]
+  private val itemSlots = mutable.HashMap.empty[I, Int]
+  private val observers = mutable.HashMap.empty[Int, WeakHashSet[SlotObserver]]
+
+  /**
+    * Called after a new item is added to the inventory.
+    *
+    * @param slot the slot the item was added to
+    */
+  def onItemAdded(slot: Slot): Unit
+
+  /**
+    * Called after an item is removed from the inventory.
+    *
+    * When the item is replaced by another one, the event are sequenced in the following order:
+    *
+    *   1. the old item is removed
+    *   1. [[onItemRemoved]] is called, with `replacedBy` containing the new item
+    *   1. the new item is added
+    *   1. [[onItemAdded]] is called
+    *
+    * @param slot        the slot the item was removed from
+    * @param removedItem the previously present item
+    * @param replacedBy  if known, the item it was replaced by ([[onItemAdded]] is still called)
+    */
+  def onItemRemoved(slot: Slot, removedItem: I, replacedBy: Option[I]): Unit
+
+  /**
+    * An iterator over all slots occupied in this inventory.
+    */
+  def inventoryIterator: Iterator[Slot] = slotItems.keysIterator.map(Slot(_))
+
+  def clearInventory(): Unit = {
+    for (slot <- slotItems.keys.toArray) {
+      Slot(slot).remove()
+    }
+  }
+
+  private def slotObservers(slotIndex: Int): Iterator[SlotObserver] =
+    observers.get(slotIndex).iterator.flatMap(_.view.keys)
+
+  private def onItemAddedImpl(slot: Slot): Unit = {
+    onItemAdded(slot)
+    slotObservers(slot.index).foreach(_.onItemAdded())
+  }
+
+  private def onItemRemovedImpl(slot: Slot, removedItem: I, replacedBy: Option[I]): Unit = {
+    onItemRemoved(slot, removedItem, replacedBy)
+    slotObservers(slot.index).foreach(_.onItemRemoved(removedItem, replacedBy))
+  }
+
+  /**
+    * A proxy to access a slot of the inventory.
+    */
+  final class Slot private[Inventory](val index: Int) {
+    require(index >= 0)
+
+    def isEmpty: Boolean = get.isEmpty
+
+    def nonEmpty: Boolean = !isEmpty
+
+    /**
+      * Inserts the `item` into this slot (replacing the previous item if any).
+      */
+    def put(item: inventory.I): Unit = {
+      setSlot(index, Some(item))
+    }
+
+    /**
+      * Allows inserting/removing the item in this slot.
+      */
+    def set(item: Option[inventory.I]): Unit = {
+      setSlot(index, item)
+    }
+
+    /**
+      * Removes the item contained in this slot if there is one.
+      */
+    def remove(): Unit = {
+      setSlot(index, None)
+    }
+
+    /**
+      * The [[Item]] contained in this slot.
+      */
+    def get: Option[inventory.I] = slotItems.get(index)
+
+    val inventory: Inventory.this.type = Inventory.this
+
+    /**
+      * Registers an observer to receive item added/removed events.
+      *
+      * @note The inventory keeps a '''weak''' reference to the `observer`.
+      */
+    def addObserver(observer: SlotObserver): Unit = {
+      observers.getOrElseUpdate(index, new WeakHashSet) += observer -> ()
+    }
+
+    def removeObserver(observer: SlotObserver): Unit = {
+      for (slotObservers <- observers.get(index)) {
+        slotObservers.remove(observer)
+
+        if (slotObservers.isEmpty) {
+          observers.remove(index)
+        }
+      }
+    }
+
+    private[inventory] def notifySlot(notification: Item.Notification): Unit = {
+      slotObservers(index).foreach(_.onItemNotification(notification))
+    }
+
+    override def equals(other: Any): Boolean = other match {
+      case that: Inventory#Slot =>
+        // in case you're wondering wtf this is:
+        // IntelliJ IDEA has a bug that wrongly rejects `inventory == that.inventory` due to a typing error
+        // (the code is accepted by the compiler though)
+        // stripping this.type seems to help
+        val thisInv = classOf[Inventory].cast(inventory)
+        val thatInv = classOf[Inventory].cast(that.inventory)
+        thisInv == thatInv && index == that.index
+
+      case _ => false
+    }
+
+    override def hashCode(): Int = {
+      val state = Seq(inventory, index)
+      state.map(_.hashCode()).foldLeft(0)((a, b) => 31 * a + b)
+    }
+  }
+
+  final object Slot {
+    /**
+      * Creates a proxy to an inventory slot.
+      */
+    def apply(index: Int) = new Slot(index)
+  }
+
+  private def setSlot(index: Int, item: Option[I]): Unit = {
+    val slot = Slot(index)
+
+    (slotItems.get(index), item) match {
+      case (Some(oldItem), Some(newItem)) if oldItem == newItem =>
+        // no-op
+
+      case (Some(oldItem), Some(newItem)) =>
+        // replace old with new
+        doRemove(index)
+        onItemRemovedImpl(slot, oldItem, Some(newItem))
+        doInsert(index, newItem)
+        onItemAddedImpl(slot)
+
+      case (Some(oldItem), None) =>
+        // remove old
+        doRemove(index)
+        onItemRemovedImpl(slot, oldItem, None)
+
+      case (None, Some(newItem)) =>
+        // add new
+        doInsert(index, newItem)
+        onItemAddedImpl(slot)
+
+      case (None, None) =>
+        // no-op
+    }
+  }
+
+  private def doRemove(index: Int): Unit = {
+    for (oldItem <- slotItems.remove(index)) {
+      assert(oldItem.slot.exists(_.index == index))
+      oldItem.slot = None
+
+      val oldIndex = itemSlots.remove(oldItem)
+      assert(oldIndex.contains(index))
+    }
+  }
+
+  private def doInsert(index: Int, item: I): Unit = {
+    assert(!itemSlots.contains(item))
+    assert(!slotItems.contains(index))
+    assert(item.slot.isEmpty)
+
+    slotItems(index) = item
+    itemSlots(item) = index
+    item.slot = Some(Slot(index))
+  }
+}
+
+object Inventory {
+  trait SlotObserver {
+    /**
+      * Called after an item was inserted into this slot.
+      *
+      * @note [[Inventory.onItemAdded]] is called before this method.
+      */
+    def onItemAdded(): Unit
+
+    /**
+      * Called after an item was removed from this slot.
+      *
+      * In particular, the slot no longer contains the removed item.
+      *
+      * @note [[Inventory.onItemRemoved]] is called before this method.
+      */
+    def onItemRemoved(removedItem: Item, replacedBy: Option[Item]): Unit
+
+    /**
+      * Called when an item contained in this slot sends a notification via [[Item.notifySlot]].
+      */
+    def onItemNotification(notification: Item.Notification): Unit
+  }
+}

src/main/scala/ocelot/desktop/inventory/Item.scala

@@ -0,0 +1,92 @@
+package ocelot.desktop.inventory
+
+import ocelot.desktop.ColorScheme
+import ocelot.desktop.color.Color
+import ocelot.desktop.graphics.IconDef
+import ocelot.desktop.ui.widget.contextmenu.ContextMenu
+import ocelot.desktop.ui.widget.tooltip.ItemTooltip
+import totoro.ocelot.brain.util.Tier
+import totoro.ocelot.brain.util.Tier.Tier
+
+/**
+  * Something that can be stored in an [[Inventory]].
+  */
+trait Item {
+  private var _slot: Option[Inventory#Slot] = None
+
+  /**
+    * The slot this item is stored in.
+    */
+  def slot: Option[Inventory#Slot] = _slot
+
+  private[inventory] def slot_=(slot: Option[Inventory#Slot]): Unit = {
+    _slot = slot
+  }
+
+  /**
+    * Sends a `notification` to observers of the `slot`.
+    *
+    * (Which means, if the item is not put into any slot, nobody will receive the message.)
+    */
+  final def notifySlot(notification: Item.Notification): Unit = {
+    slot.foreach(_.notifySlot(notification))
+  }
+
+  /**
+    * The name of the item (as shown in the tooltip).
+    */
+  def name: String = factory.name
+
+  /**
+    * The icon used to draw the item in a slot.
+    */
+  def icon: IconDef = factory.icon
+
+  /**
+    * The tier of the item (if it has one).
+    *
+    * This affects the color of the item name in the tooltip.
+    */
+  def tier: Option[Tier] = factory.tier
+
+  protected def tooltipNameColor: Color = ColorScheme("Tier" + tier.getOrElse(Tier.One).id)
+
+  /**
+    * Override this in subclasses to customize the contents of the tooltip.
+    *
+    * @example {{{
+    *            override protected def fillTooltipBody(body: Widget): Unit = {
+    *              super.fillTooltipBody(body)
+    *              body.children :+= new Label {
+    *                override def text: String = "Hello world"
+    *                override def color: Color = Color.Grey
+    *              }
+    *            }
+    *          }}}
+    */
+  def fillTooltip(tooltip: ItemTooltip): Unit = {
+    tooltip.addLine(name, tooltipNameColor)
+  }
+
+  /**
+    * Override this in subclasses to add new entries to the context menu.
+    *
+    * It usually makes sense to call `super.fillRmbMenu` ''after'' you've added your own entries.
+    */
+  def fillRmbMenu(menu: ContextMenu): Unit = {}
+
+  /**
+    * The factory that can be used to build an independent instance of this [[Item]]
+    * in a way equivalent to this one (e.g. the same tier, label, EEPROM code).
+    *
+    * Keep this rather cheap.
+    */
+  def factory: ItemFactory
+}
+
+object Item {
+  /**
+    * A notification that can be sent with [[Item.notifySlot]].
+    */
+  trait Notification
+}

src/main/scala/ocelot/desktop/inventory/ItemFactory.scala

@@ -0,0 +1,59 @@
+package ocelot.desktop.inventory
+
+import ocelot.desktop.graphics.IconDef
+import totoro.ocelot.brain.util.Tier.Tier
+
+/**
+  * Provides information about a class of [[Item]]s and allows to build an item instance.
+  *
+  * Used by [[ocelot.desktop.ui.widget.slot.SlotWidget SlotWidgets]]
+  * (and [[ocelot.desktop.ui.widget.slot.ItemChooser]]) to tell if you can insert an item into the slot
+  * without having to actually construct one.
+  * In particular, make sure the [[tier]] and [[itemClass]] provided by the factory are accurate.
+  */
+trait ItemFactory {
+  /**
+    * The concrete type of the [[Item]] built by the factory.
+    */
+  type I <: Item
+
+  /**
+    * The runtime class of the [[Item]] built by the factory.
+    *
+    * @note It's expected that `build().getClass == itemClass`.
+    */
+  def itemClass: Class[I]
+
+  /**
+    * A name that represents what will be built by the factory.
+    *
+    * Usually [[name]] and [[Item.name]] are the same (in fact, the latter defaults to this unless overridden).
+    *
+    * Used by the [[ocelot.desktop.ui.widget.slot.ItemChooser ItemChooser]] in its entries.
+    */
+  def name: String
+
+  /**
+    * The tier of an item this factory will construct in its [[build]] method.
+    *
+    * @note It's expected that `build().tier == tier`.
+    */
+  def tier: Option[Tier]
+
+  /**
+    * The icon of an item this factory will construct in its [[build]] method.
+    *
+    * Used by the [[ocelot.desktop.ui.widget.slot.ItemChooser ItemChooser]] in its entries.
+    */
+  def icon: IconDef
+
+  /**
+    * Constructs a new item instance.
+    */
+  def build(): I
+
+  /**
+    * Returns a list of recoverers provided by the factory,
+    */
+  def recoverers: Iterable[ItemRecoverer[_, _]]
+}

src/main/scala/ocelot/desktop/inventory/ItemRecoverer.scala

@@ -0,0 +1,18 @@
+package ocelot.desktop.inventory
+
+import scala.reflect.{ClassTag, classTag}
+
+/**
+  * Allows recovering an [[Item]] from [[S]] (typically an [[totoro.ocelot.brain.entity.traits.Entity Entity]]).
+  *
+  * This is used for migration from old saves before the inventory system was introduced to Ocelot Desktop.
+  */
+final class ItemRecoverer[S: ClassTag, I <: Item](f: S => I) {
+  val sourceClass: Class[_] = classTag[S].runtimeClass
+
+  def recover(source: S): I = f(source)
+}
+
+object ItemRecoverer {
+  def apply[S: ClassTag, I <: Item](f: S => I): ItemRecoverer[S, I] = new ItemRecoverer(f)
+}

src/main/scala/ocelot/desktop/inventory/Items.scala

@@ -0,0 +1,142 @@
+package ocelot.desktop.inventory
+
+import ocelot.desktop.graphics.IconDef
+import ocelot.desktop.inventory.item._
+import ocelot.desktop.util.Logging
+import ocelot.desktop.util.ReflectionUtils.linearizationOrder
+import totoro.ocelot.brain.loot.Loot
+import totoro.ocelot.brain.util.ExtendedTier.ExtendedTier
+import totoro.ocelot.brain.util.Tier.Tier
+import totoro.ocelot.brain.util.{ExtendedTier, Tier}
+
+import scala.collection.mutable
+import scala.collection.mutable.ArrayBuffer
+
+object Items extends Logging {
+  private val _groups = ArrayBuffer.empty[ItemGroup]
+  private val _recoverers = mutable.Map.empty[Class[_], ItemRecoverer[_, _]]
+
+  // this is just to force load the class during initialization
+  def init(): Unit = {}
+
+  /**
+    * Registers a recoverer for [[ItemRecoverer.sourceClass]].
+    */
+  def registerRecoverer(recoverer: ItemRecoverer[_, _]): Unit = {
+    if (!_recoverers.contains(recoverer.sourceClass)) {
+      _recoverers(recoverer.sourceClass) = recoverer
+      logger.info(s"Registered a recoverer for ${recoverer.sourceClass.getName}")
+    }
+  }
+
+  private def registerItemFactoryRecoverers(factory: ItemFactory): Unit = {
+    for (recoverer <- factory.recoverers) {
+      registerRecoverer(recoverer)
+    }
+  }
+
+  def registerSingleton(factory: ItemFactory): Unit = {
+    _groups += SingletonItemGroup(factory.name, factory)
+    registerItemFactoryRecoverers(factory)
+  }
+
+  def registerTiered(name: String, tiers: IterableOnce[Tier])(factory: Tier => ItemFactory): Unit = {
+    val group = TieredItemGroup(name, tiers.iterator.map(tier => (tier, factory(tier))).toSeq)
+    _groups += group
+
+    for ((_, factory) <- group.factories) {
+      registerItemFactoryRecoverers(factory)
+    }
+  }
+
+  def registerExtendedTiered(name: String, tiers: IterableOnce[ExtendedTier])(
+    factory: ExtendedTier => ItemFactory
+  ): Unit = {
+    val group = ExtendedTieredItemGroup(name, tiers.iterator.map(tier => (tier, factory(tier))).toSeq)
+    _groups += group
+
+    for ((_, factory) <- group.factories) {
+      registerItemFactoryRecoverers(factory)
+    }
+  }
+
+  def registerArbitrary(name: String, icon: IconDef, factories: IterableOnce[(String, ItemFactory)]): Unit = {
+    val group = ArbitraryItemGroup(name, icon, factories.iterator.toSeq)
+    _groups += group
+
+    for ((_, factory) <- group.factories) {
+      registerItemFactoryRecoverers(factory)
+    }
+  }
+
+  def groups: Iterable[ItemGroup] = _groups
+
+  /**
+    * Attempts to recover an [[Item]] from `source`.
+    *
+    * Checks superclasses and traits while looking for a recoverer.
+    */
+  def recover[A](source: A): Option[Item] = {
+    linearizationOrder(source.getClass.asInstanceOf[Class[_]])
+      .flatMap(_recoverers.get)
+      .map(_.asInstanceOf[ItemRecoverer[_ >: A, _ <: Item]].recover(source))
+      .nextOption()
+  }
+
+  sealed trait ItemGroup {
+    def name: String
+  }
+
+  case class SingletonItemGroup(name: String, factory: ItemFactory) extends ItemGroup
+
+  case class TieredItemGroup(name: String, factories: Seq[(Tier, ItemFactory)]) extends ItemGroup
+
+  case class ExtendedTieredItemGroup(name: String, factories: Seq[(ExtendedTier, ItemFactory)]) extends ItemGroup
+
+  case class ArbitraryItemGroup(name: String, icon: IconDef, factories: Seq[(String, ItemFactory)]) extends ItemGroup
+
+  //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+  registerTiered("CPU", Tier.One to Tier.Three)(new CpuItem.Factory(_))
+  registerTiered("APU", Tier.Two to Tier.Creative)(tier => new ApuItem.Factory(tier.saturatingSub(1)))
+
+  registerExtendedTiered("Memory", ExtendedTier.One to ExtendedTier.ThreeHalf)(new MemoryItem.Factory(_))
+
+  registerTiered("HDD", Tier.One to Tier.Three)(new HddItem.Factory(managed = true, _))
+
+  registerArbitrary(
+    "Floppy",
+    FloppyItem.Factory.Empty.icon,
+    Loot.Floppies.iterator
+      .map(new FloppyItem.Factory.Loot(_))
+      .map(factory => (factory.name, factory)) ++ Some(("Empty", FloppyItem.Factory.Empty))
+  )
+
+  registerArbitrary(
+    "EEPROM",
+    EepromItem.Factory.Empty.icon,
+    Loot.Eeproms.iterator
+      .map(new EepromItem.Factory.Loot(_))
+      .map(factory => (factory.name, factory)) ++ Some(("Empty", EepromItem.Factory.Empty))
+  )
+
+  registerTiered("Graphics Card", Tier.One to Tier.Three)(new GraphicsCardItem.Factory(_))
+  registerSingleton(NetworkCardItem.Factory)
+  registerTiered("Wireless Net. Card", Tier.One to Tier.Two) {
+    case Tier.One => WirelessNetworkCardItem.Tier1.Factory
+    case Tier.Two => WirelessNetworkCardItem.Tier2.Factory
+  }
+  registerSingleton(LinkedCardItem.Factory)
+  registerSingleton(InternetCardItem.Factory)
+  registerTiered("Redstone Card", Tier.One to Tier.Two) {
+    case Tier.One => RedstoneCardItem.Tier1.Factory
+    case Tier.Two => RedstoneCardItem.Tier2.Factory
+  }
+  registerTiered("Data Card", Tier.One to Tier.Three) {
+    case Tier.One   => DataCardItem.Tier1.Factory
+    case Tier.Two   => DataCardItem.Tier2.Factory
+    case Tier.Three => DataCardItem.Tier3.Factory
+  }
+  registerSingleton(SoundCardItem.Factory)
+  registerSingleton(SelfDestructingCardItem.Factory)
+}

src/main/scala/ocelot/desktop/inventory/PersistedInventory.scala

@@ -0,0 +1,119 @@
+package ocelot.desktop.inventory
+
+import ocelot.desktop.OcelotDesktop
+import ocelot.desktop.inventory.PersistedInventory._
+import ocelot.desktop.inventory.traits.{ComponentItem, PersistableItem}
+import ocelot.desktop.util.Logging
+import ocelot.desktop.util.ReflectionUtils.findUnaryConstructor
+import totoro.ocelot.brain.nbt.ExtendedNBT.{extendNBTTagCompound, extendNBTTagList}
+import totoro.ocelot.brain.nbt.persistence.NBTPersistence
+import totoro.ocelot.brain.nbt.{NBT, NBTTagCompound}
+
+import scala.collection.mutable
+
+/**
+  * Provides persistence for an [[Inventory]].
+  *
+  * [[ComponentItem]]s are treated specially: their [[ComponentItem.component component]] is persisted
+  * along with the item when saving. When loading the item, it first loads the component and uses it to instantiate
+  * the item (as required by [[ComponentItem]]).
+  */
+trait PersistedInventory extends Inventory with Logging {
+  override type I <: Item with PersistableItem
+
+  def load(nbt: NBTTagCompound): Unit = {
+    val slotsToRemove = inventoryIterator.map(_.index).to(mutable.Set)
+
+    for (slotNbt <- nbt.getTagList(InventoryTag, NBT.TAG_COMPOUND).iterator[NBTTagCompound]) {
+      val slotIndex = slotNbt.getInteger(SlotIndexTag)
+      slotsToRemove -= slotIndex
+
+      val itemNbt = slotNbt.getCompoundTag(SlotItemTag)
+      val itemClass = Class.forName(slotNbt.getString(SlotItemClassTag))
+
+      try {
+        val item = if (classOf[ComponentItem].isAssignableFrom(itemClass))
+          loadComponentItem(itemClass, slotNbt)
+        else
+          loadPlainItem(itemClass)
+
+        item.load(itemNbt)
+        Slot(slotIndex).put(item)
+      } catch {
+        case ItemLoadException(message) =>
+          logger.error(
+            s"Could not restore an item in the slot $slotIndex of " +
+              s"the inventory $this (class ${this.getClass.getName}): $message",
+          )
+          onSlotLoadFailed(slotIndex)
+      }
+    }
+
+    for (slotIndex <- slotsToRemove) {
+      Slot(slotIndex).remove()
+    }
+  }
+
+  def save(nbt: NBTTagCompound): Unit = {
+    nbt.setNewTagList(
+      InventoryTag, inventoryIterator.map { slot =>
+        val item = slot.get.get
+
+        val slotNbt = new NBTTagCompound
+        slotNbt.setInteger(SlotIndexTag, slot.index)
+
+        val itemNbt = new NBTTagCompound
+        item.save(itemNbt)
+        slotNbt.setTag(SlotItemTag, itemNbt)
+        slotNbt.setString(SlotItemClassTag, item.getClass.getName)
+
+        item match {
+          case item: ComponentItem => saveComponentItem(slotNbt, item)
+          case _ =>
+        }
+
+        slotNbt
+      }
+    )
+  }
+
+  @throws[ItemLoadException]("if the item could not be loaded")
+  protected def loadComponentItem(itemClass: Class[_], slotNbt: NBTTagCompound): I = {
+    val entityNbt = slotNbt.getCompoundTag(SlotEntityTag)
+    val entity = NBTPersistence.load(entityNbt, OcelotDesktop.workspace)
+
+    val constructor = findUnaryConstructor(itemClass, entity.getClass) match {
+      case Some(constructor) => constructor
+      case None =>
+        throw ItemLoadException(
+          s"an item class ${itemClass.getName} cannot be instantiated with $entity (class ${entity.getClass.getName})"
+        )
+    }
+
+    constructor.newInstance(entity).asInstanceOf[I]
+  }
+
+  //noinspection ScalaWeakerAccess
+  @throws[ItemLoadException]("if the item could not be loaded")
+  protected def loadPlainItem(itemClass: Class[_]): I = {
+    itemClass.getConstructor().newInstance().asInstanceOf[I]
+  }
+
+  protected def onSlotLoadFailed(slotIndex: Int): Unit = {
+    Slot(slotIndex).remove()
+  }
+
+  protected def saveComponentItem(slotNbt: NBTTagCompound, item: ComponentItem): Unit = {
+    slotNbt.setTag(SlotEntityTag, NBTPersistence.save(item.component))
+  }
+}
+
+object PersistedInventory {
+  private val InventoryTag = "inventory"
+  private val SlotIndexTag = "slotIndex"
+  private val SlotItemTag = "item"
+  private val SlotItemClassTag = "class"
+  private val SlotEntityTag = "entity"
+
+  case class ItemLoadException(message: String) extends Exception(message)
+}

src/main/scala/ocelot/desktop/inventory/SyncedInventory.scala

@@ -0,0 +1,294 @@
+package ocelot.desktop.inventory
+
+import ocelot.desktop.OcelotDesktop
+import ocelot.desktop.inventory.PersistedInventory.ItemLoadException
+import ocelot.desktop.inventory.SyncedInventory.SlotStatus.SlotStatus
+import ocelot.desktop.inventory.SyncedInventory.SyncDirection.SyncDirection
+import ocelot.desktop.inventory.SyncedInventory._
+import ocelot.desktop.inventory.traits.ComponentItem
+import ocelot.desktop.ui.event.BrainEvent
+import ocelot.desktop.ui.widget.EventHandlers
+import ocelot.desktop.util.Logging
+import ocelot.desktop.util.ReflectionUtils.findUnaryConstructor
+import totoro.ocelot.brain.entity.traits.{Entity, Environment, Inventory => BrainInventory}
+import totoro.ocelot.brain.event.{InventoryEntityAddedEvent, InventoryEntityRemovedEvent}
+import totoro.ocelot.brain.nbt.NBTTagCompound
+
+import scala.annotation.tailrec
+
+/**
+  * A [[PersistedInventory]] backed by a [[BrainInventory brain Inventory]].
+  *
+  * Synchronizes the contents of the two inventories, propagating changes from one to the other.
+  *
+  * When a new [[Item]] is added to the Desktop inventory, its [[ComponentItem.component]] is added to
+  * the [[brainInventory]]. When a new [[Entity]] is added to the [[brainInventory]], an [[Item]] is recovered from it
+  * by using an appropriate [[ItemRecoverer]] from [[Items the registry]].
+  *
+  * While synchronizing, relies on the convergence of changes, but guards against stack overflows
+  * by limiting the recursion depth.
+  */
+trait SyncedInventory extends PersistedInventory with Logging {
+  override type I <: Item with ComponentItem
+
+  // to avoid synchronization while we're loading stuff
+  private var isLoading = false
+
+  @volatile
+  private var syncFuel: Int = _
+  refuel()
+
+  protected def eventHandlers: EventHandlers
+
+  /**
+    * The backing [[BrainInventory brain Inventory]].
+    */
+  def brainInventory: BrainInventory
+
+  override def load(nbt: NBTTagCompound): Unit = {
+    isLoading = true
+
+    try {
+      super.load(nbt)
+    } finally {
+      isLoading = false
+    }
+
+    val occupiedSlots = inventoryIterator.map(_.index).toSet
+      .union(brainInventory.inventory.iterator.map(_.index).toSet)
+
+    for (slotIndex <- occupiedSlots) {
+      sync(slotIndex, SyncDirection.Reconcile)
+    }
+  }
+
+  @throws[ItemLoadException]("if the item could not be loaded")
+  override protected def loadComponentItem(itemClass: Class[_], slotNbt: NBTTagCompound): I = {
+    val entityAddress = slotNbt.getString(SlotEntityAddressTag)
+
+    // why not OcelotDesktop.workspace.entityByAddress?
+    // well, that one only looks for tile entities (computers, screens, etc.), and our items are none of that...
+    val matchingEntities = brainInventory.inventory.iterator
+      .flatMap(_.get)
+      .collect { case env: Environment if env.node.address == entityAddress => env }
+
+    val entity = matchingEntities.nextOption() match {
+      case Some(entity) => entity
+      case None => throw ItemLoadException(s"entity $entityAddress has disappeared")
+    }
+
+    findUnaryConstructor(itemClass, entity.getClass) match {
+      case Some(constructor) => constructor.newInstance(entity).asInstanceOf[I]
+
+      case None =>
+        throw ItemLoadException(
+          s"an item class ${itemClass.getName} cannot be instantiated " +
+            s"with $entity (class ${entity.getClass.getName})",
+        )
+    }
+  }
+
+  override protected def onSlotLoadFailed(slotIndex: Int): Unit = {
+    // we'll deal with it the during synchronization
+  }
+
+  override protected def saveComponentItem(slotNbt: NBTTagCompound, item: ComponentItem): Unit = {
+    slotNbt.setString(SlotEntityAddressTag, item.component.node.address)
+  }
+
+  eventHandlers += {
+    case BrainEvent(InventoryEntityAddedEvent(slot, _)) if slot.inventory.owner eq brainInventory =>
+      sync(slot.index, SyncDirection.BrainToDesktop)
+
+    case BrainEvent(InventoryEntityRemovedEvent(slot, _)) if slot.inventory.owner eq brainInventory =>
+      sync(slot.index, SyncDirection.BrainToDesktop)
+  }
+
+  override def onItemAdded(slot: Slot): Unit = {
+    if (!isLoading) {
+      sync(slot.index, SyncDirection.DesktopToBrain)
+    }
+  }
+
+  override def onItemRemoved(slot: Slot, removedItem: I, replacedBy: Option[I]): Unit = {
+    if (!isLoading) {
+      sync(slot.index, SyncDirection.DesktopToBrain)
+    }
+  }
+
+  private def sync(slotIndex: Int, direction: SyncDirection): Unit = {
+    val initialSync = syncFuel == InitialSyncFuel
+
+    try {
+      doSync(slotIndex, direction)
+    } finally {
+      if (initialSync) {
+        refuel()
+      }
+    }
+  }
+
+  private def refuel(): Unit = {
+    syncFuel = InitialSyncFuel
+  }
+
+  @tailrec
+  private def doSync(slotIndex: Int, direction: SyncDirection): Unit = {
+    syncFuel -= 1
+
+    if (syncFuel < 0) {
+      // ignore: the limit has already been reached
+    } else if (syncFuel == 0) {
+      logger.error(
+        s"Got trapped in an infinite loop while trying to synchronize the slot $slotIndex " +
+          s"in $this (class ${this.getClass.getName})!",
+      )
+      logger.error(
+        "The item in the slot: " +
+          Slot(slotIndex).get.map(item => s"$item (class ${item.getClass.getName})").getOrElse("<empty>"),
+      )
+      logger.error(
+        "The entity if the slot: " +
+          brainInventory.inventory(slotIndex)
+            .get
+            .map(entity => s"$entity (class ${entity.getClass.getName})")
+            .getOrElse("<empty>"),
+      )
+
+      logger.error("Breaking the loop forcefully by removing the items.")
+      Slot(slotIndex).remove()
+      brainInventory.inventory(slotIndex).remove()
+    } else {
+      direction match {
+        case _ if checkSlotStatus(slotIndex) == SlotStatus.Synchronized =>
+
+        case SyncDirection.DesktopToBrain =>
+          // the `asInstanceOf` is indeed entirely superfluous, but IntelliJ IDEA complains otherwise...
+          OcelotDesktop.withTickLockAcquired {
+            brainInventory.inventory(slotIndex).set(Slot(slotIndex).get.map(_.asInstanceOf[ComponentItem].component))
+          }
+
+        case SyncDirection.BrainToDesktop =>
+          val item = brainInventory.inventory(slotIndex).get match {
+            case Some(entity) => Items.recover(entity) match {
+              case Some(item) => Some(item.asInstanceOf[I])
+
+              case None =>
+                logger.error(
+                  s"An entity ($entity class ${entity.getClass.getName}) was inserted into a slot " +
+                    s"(index: $slotIndex) of a brain inventory $brainInventory, " +
+                    s"but we were unable to recover an Item from it.",
+                )
+                logger.error(
+                  s"A Desktop inventory $this (class ${getClass.getName}) could not recover the item. Removing.",
+                )
+                logEntityLoss(slotIndex, entity)
+
+                None
+            }
+
+            case None => None
+          }
+
+          Slot(slotIndex).set(item)
+
+        case SyncDirection.Reconcile => checkSlotStatus(slotIndex) match {
+          case SlotStatus.Synchronized => // no-op
+
+          // let's just grab whatever we have
+          case SlotStatus.DesktopNonEmpty => doSync(slotIndex, SyncDirection.DesktopToBrain)
+          case SlotStatus.BrainNonEmpty => doSync(slotIndex, SyncDirection.BrainToDesktop)
+
+          case SlotStatus.Conflict =>
+            // so, the brain inventory and the Desktop inventory have conflicting views on what the slot contains
+            // we'll let Desktop win because it has more info
+
+            (brainInventory.inventory(slotIndex).get, Slot(slotIndex).get) match {
+              case (Some(entity), Some(item)) =>
+                logger.error(
+                  s"Encountered an inventory conflict for slot $slotIndex! " +
+                    s"The Desktop inventory believes the slot contains $item (class ${item.getClass.getName}), " +
+                    s"but the brain inventory believes the slot contains $entity (class ${entity.getClass.getName}).",
+                )
+                logger.error("Resolving the conflict in favor of Ocelot Desktop.")
+
+              case _ =>
+                // this really should not happen... but alright, let's throw an exception at least
+                throw new IllegalStateException(
+                  "an inventory conflict was detected even though one of the slots is empty",
+                )
+            }
+
+            doSync(slotIndex, SyncDirection.DesktopToBrain)
+        }
+      }
+    }
+  }
+
+  private def logEntityLoss(slotIndex: Int, entity: Entity): Unit = {
+    logger.error(
+      s"Encountered a data loss! " +
+        s"In the brain inventory $brainInventory (class ${brainInventory.getClass.getName}), " +
+        s"the entity $entity (class ${entity.getClass.getName}) is deleted from the slot $slotIndex.",
+    )
+  }
+
+  private def checkSlotStatus(slotIndex: Int): SlotStatus =
+    (Slot(slotIndex).get, brainInventory.inventory(slotIndex).get) match {
+      case (Some(item), Some(entity)) if item.component eq entity => SlotStatus.Synchronized
+      case (Some(_), Some(_)) => SlotStatus.Conflict
+      case (Some(_), None) => SlotStatus.DesktopNonEmpty
+      case (None, Some(_)) => SlotStatus.BrainNonEmpty
+      case (None, None) => SlotStatus.Synchronized
+    }
+}
+
+object SyncedInventory {
+  private val SlotEntityAddressTag = "entity"
+
+  private val InitialSyncFuel = 5
+
+  object SyncDirection extends Enumeration {
+    type SyncDirection = Value
+
+    /**
+      * Apply a change from the [[SyncedInventory]] to [[SyncedInventory.brainInventory]].
+      */
+    val DesktopToBrain: SyncDirection = Value
+
+    /**
+      * Apply a change from the [[SyncedInventory.brainInventory]] to [[SyncedInventory]].
+      */
+    val BrainToDesktop: SyncDirection = Value
+
+    /**
+      * Try to reconcile conflicts between [[SyncedInventory]] and its [[SyncedInventory.brainInventory]].
+      */
+    val Reconcile: SyncDirection = Value
+  }
+
+  object SlotStatus extends Enumeration {
+    type SlotStatus = Value
+
+    /**
+      * The slots are in sync (both are empty or they contain the same entity).
+      */
+    val Synchronized: SlotStatus = Value
+
+    /**
+      * [[SyncedInventory]]'s slot is non-empty; [[SyncedInventory.brainInventory]]'s is empty.
+      */
+    val DesktopNonEmpty: SlotStatus = Value
+
+    /**
+      * [[SyncedInventory]]'s slot is empty; [[SyncedInventory.brainInventory]]'s isn't.
+      */
+    val BrainNonEmpty: SlotStatus = Value
+
+    /**
+      * The [[SyncedInventory]] and the [[SyncedInventory.brainInventory]] are both non-empty
+      * and contain different items.
+      */
+    val Conflict: SlotStatus = Value
+  }
+}

src/main/scala/ocelot/desktop/inventory/item/ApuItem.scala

@@ -0,0 +1,35 @@
+package ocelot.desktop.inventory.item
+
+import ocelot.desktop.graphics.{IconDef, Icons}
+import ocelot.desktop.inventory.traits.{ComponentItem, CpuLikeItem, PersistableItem}
+import ocelot.desktop.inventory.{Item, ItemFactory, ItemRecoverer}
+import totoro.ocelot.brain.entity.APU
+import totoro.ocelot.brain.entity.traits.{Entity, GenericCPU}
+import totoro.ocelot.brain.util.Tier.Tier
+
+class ApuItem(val apu: APU) extends Item with ComponentItem with PersistableItem with CpuLikeItem {
+  override def component: Entity with GenericCPU = apu
+
+  override def factory: ApuItem.Factory = new ApuItem.Factory(apu.tier)
+}
+
+object ApuItem {
+  class Factory(_tier: Tier) extends ItemFactory {
+    override type I = ApuItem
+
+    override def itemClass: Class[I] = classOf
+
+    override def name: String = s"APU (${tier.get.label})"
+
+    // there are T2, T3, and creative APUs
+    // however, the APU class starts counting from one (so it's actually T1, T2, and T3)
+    // we keep the latter tier internally and increment it when dealing with the rest of the world
+    override def tier: Option[Tier] = Some(_tier.saturatingAdd(1))
+
+    override def icon: IconDef = Icons.Apu(_tier)
+
+    override def build(): ApuItem = new ApuItem(new APU(_tier))
+
+    override def recoverers: Iterable[ItemRecoverer[_, _]] = Some(ItemRecoverer(new ApuItem(_)))
+  }
+}

src/main/scala/ocelot/desktop/inventory/item/CpuItem.scala

@@ -0,0 +1,32 @@
+package ocelot.desktop.inventory.item
+
+import ocelot.desktop.graphics.{IconDef, Icons}
+import ocelot.desktop.inventory.traits.{ComponentItem, CpuLikeItem, PersistableItem}
+import ocelot.desktop.inventory.{Item, ItemFactory, ItemRecoverer}
+import totoro.ocelot.brain.entity.CPU
+import totoro.ocelot.brain.entity.traits.{Entity, GenericCPU}
+import totoro.ocelot.brain.util.Tier.Tier
+
+class CpuItem(val cpu: CPU) extends Item with ComponentItem with PersistableItem with CpuLikeItem {
+  override def component: Entity with GenericCPU = cpu
+
+  override def factory: CpuItem.Factory = new CpuItem.Factory(cpu.tier)
+}
+
+object CpuItem {
+  class Factory(_tier: Tier) extends ItemFactory {
+    override type I = CpuItem
+
+    override def itemClass: Class[I] = classOf
+
+    override def name: String = s"CPU (${_tier.label})"
+
+    override def tier: Option[Tier] = Some(_tier)
+
+    override def icon: IconDef = Icons.Cpu(_tier)
+
+    override def build(): CpuItem = new CpuItem(new CPU(_tier))
+
+    override def recoverers: Iterable[ItemRecoverer[_, _]] = Some(ItemRecoverer(new CpuItem(_)))
+  }
+}

src/main/scala/ocelot/desktop/inventory/item/DataCardItem.scala

@@ -0,0 +1,79 @@
+package ocelot.desktop.inventory.item
+
+import ocelot.desktop.graphics.{IconDef, Icons}
+import ocelot.desktop.inventory.traits.{CardItem, ComponentItem, PersistableItem}
+import ocelot.desktop.inventory.{Item, ItemFactory, ItemRecoverer}
+import totoro.ocelot.brain.entity.DataCard
+import totoro.ocelot.brain.entity.traits.{Entity, Environment}
+import totoro.ocelot.brain.util.Tier
+import totoro.ocelot.brain.util.Tier.Tier
+
+abstract class DataCardItem extends Item with ComponentItem with PersistableItem with CardItem
+
+object DataCardItem {
+  abstract class Factory extends ItemFactory {
+    override def name: String = s"Data Card (${tier.get.label})"
+
+    override def icon: IconDef = Icons.DataCard(tier.get)
+  }
+
+  class Tier1(val dataCard: DataCard.Tier1) extends DataCardItem {
+    override def component: Entity with Environment = dataCard
+
+    override def factory: Factory = DataCardItem.Tier1.Factory
+  }
+
+  object Tier1 {
+    object Factory extends Factory {
+      override type I = DataCardItem.Tier1
+
+      override def itemClass: Class[I] = classOf
+
+      override def tier: Option[Tier] = Some(Tier.One)
+
+      override def build(): DataCardItem.Tier1 = new DataCardItem.Tier1(new DataCard.Tier1)
+
+      override def recoverers: Iterable[ItemRecoverer[_, _]] = Some(ItemRecoverer(new DataCardItem.Tier1(_)))
+    }
+  }
+
+  class Tier2(val dataCard: DataCard.Tier2) extends DataCardItem {
+    override def component: Entity with Environment = dataCard
+
+    override def factory: Factory = DataCardItem.Tier2.Factory
+  }
+
+  object Tier2 {
+    object Factory extends Factory {
+      override type I = DataCardItem.Tier2
+
+      override def itemClass: Class[I] = classOf
+
+      override def tier: Option[Tier] = Some(Tier.Two)
+
+      override def build(): DataCardItem.Tier2 = new DataCardItem.Tier2(new DataCard.Tier2)
+
+      override def recoverers: Iterable[ItemRecoverer[_, _]] = Some(ItemRecoverer(new DataCardItem.Tier2(_)))
+    }
+  }
+
+  class Tier3(val dataCard: DataCard.Tier3) extends DataCardItem {
+    override def component: Entity with Environment = dataCard
+
+    override def factory: Factory = DataCardItem.Tier3.Factory
+  }
+
+  object Tier3 {
+    object Factory extends Factory {
+      override type I = DataCardItem.Tier3
+
+      override def itemClass: Class[I] = classOf
+
+      override def tier: Option[Tier] = Some(Tier.Three)
+
+      override def build(): DataCardItem.Tier3 = new DataCardItem.Tier3(new DataCard.Tier3)
+
+      override def recoverers: Iterable[ItemRecoverer[_, _]] = Some(ItemRecoverer(new DataCardItem.Tier3(_)))
+    }
+  }
+}

src/main/scala/ocelot/desktop/inventory/item/EepromItem.scala

@@ -0,0 +1,124 @@
+package ocelot.desktop.inventory.item
+
+import ocelot.desktop.OcelotDesktop
+import ocelot.desktop.graphics.{IconDef, Icons}
+import ocelot.desktop.inventory.traits.{ComponentItem, PersistableItem}
+import ocelot.desktop.inventory.{Item, ItemFactory, ItemRecoverer}
+import ocelot.desktop.ui.widget.InputDialog
+import ocelot.desktop.ui.widget.contextmenu.{ContextMenu, ContextMenuEntry, ContextMenuSubmenu}
+import ocelot.desktop.ui.widget.tooltip.ItemTooltip
+import totoro.ocelot.brain.entity.EEPROM
+import totoro.ocelot.brain.entity.traits.{Entity, Environment}
+import totoro.ocelot.brain.loot.Loot.{EEPROMFactory => LootEepromFactory}
+import totoro.ocelot.brain.util.Tier.Tier
+
+import java.net.{MalformedURLException, URL}
+import javax.swing.JFileChooser
+import scala.util.Try
+
+class EepromItem(val eeprom: EEPROM) extends Item with ComponentItem with PersistableItem {
+  override def component: Entity with Environment = eeprom
+
+  override def fillTooltip(tooltip: ItemTooltip): Unit = {
+    super.fillTooltip(tooltip)
+
+    val source = eeprom.codePath
+      .map(path => s"Source path: $path")
+      .orElse(eeprom.codeURL.map(url => s"Source URL: $url"))
+
+    for (source <- source) {
+      tooltip.addLine(source)
+    }
+  }
+
+  override def fillRmbMenu(menu: ContextMenu): Unit = {
+    menu.addEntry(
+      new ContextMenuSubmenu("External data source") {
+        addEntry(
+          ContextMenuEntry("Local file") {
+            OcelotDesktop.showFileChooserDialog(JFileChooser.OPEN_DIALOG, JFileChooser.FILES_ONLY) { file =>
+              Try {
+                for (file <- file) {
+                  eeprom.codePath = Some(file.toPath)
+                }
+              }
+            }
+          }
+        )
+
+        addEntry(
+          ContextMenuEntry("File via URL") {
+            new InputDialog(
+              title = "File via URL",
+              onConfirmed = { text =>
+                eeprom.codeURL = Some(new URL(text))
+              },
+              inputValidator = text =>
+                try {
+                  new URL(text)
+                  true
+                } catch {
+                  case _: MalformedURLException => false
+                },
+            ).show()
+          }
+        )
+
+        if (eeprom.codePath.nonEmpty || eeprom.codeURL.nonEmpty) {
+          addEntry(
+            ContextMenuEntry("Detach") {
+              eeprom.codeBytes = Some(Array.empty)
+            }
+          )
+        }
+      }
+    )
+
+    super.fillRmbMenu(menu)
+  }
+
+  override def factory: EepromItem.Factory = new EepromItem.Factory.Code(
+    code = eeprom.getBytes,
+    name = eeprom.label,
+    readonly = eeprom.readonly,
+  )
+}
+
+object EepromItem {
+  abstract class Factory extends ItemFactory {
+    override type I = EepromItem
+
+    override def itemClass: Class[I] = classOf
+
+    override def tier: Option[Tier] = None
+
+    override def icon: IconDef = Icons.Eeprom
+
+    override def recoverers: Iterable[ItemRecoverer[_, _]] = Some(ItemRecoverer(new EepromItem(_)))
+  }
+
+  object Factory {
+    class Loot(factory: LootEepromFactory) extends Factory {
+      override def name: String = factory.label
+
+      override def build(): EepromItem = new EepromItem(factory.create())
+    }
+
+    class Code(code: Array[Byte], override val name: String, readonly: Boolean) extends Factory {
+      override def build(): EepromItem = {
+        val eeprom = new EEPROM
+        eeprom.codeBytes = Some(code)
+        eeprom.label = name
+        eeprom.readonly = readonly
+
+        new EepromItem(eeprom)
+      }
+    }
+
+    object Empty extends Factory {
+      override def name: String = "EEPROM"
+
+      override def build(): EepromItem = new EepromItem(new EEPROM)
+    }
+  }
+}

src/main/scala/ocelot/desktop/inventory/item/FloppyItem.scala

@@ -0,0 +1,94 @@
+package ocelot.desktop.inventory.item
+
+import ocelot.desktop.graphics.{IconDef, Icons}
+import ocelot.desktop.inventory.traits.{ComponentItem, DiskItem, PersistableItem}
+import ocelot.desktop.inventory.{Item, ItemFactory, ItemRecoverer}
+import ocelot.desktop.ui.widget.contextmenu.ContextMenu
+import ocelot.desktop.ui.widget.tooltip.ItemTooltip
+import totoro.ocelot.brain.entity.traits.{Entity, Environment, Floppy}
+import totoro.ocelot.brain.entity.{FloppyManaged, FloppyUnmanaged}
+import totoro.ocelot.brain.loot.Loot.{LootFloppy, FloppyFactory => LootFloppyFactory}
+import totoro.ocelot.brain.util.DyeColor
+import totoro.ocelot.brain.util.Tier.Tier
+
+class FloppyItem(val floppy: Floppy) extends Item with ComponentItem with PersistableItem with DiskItem {
+  def color: DyeColor = floppy.color
+
+  override def component: Entity with Environment = floppy
+
+  override def name: String = floppy.name.getOrElse(super.name)
+
+  override def fillTooltip(tooltip: ItemTooltip): Unit = {
+    super.fillTooltip(tooltip)
+
+    for (label <- floppy.label.labelOption) {
+      if (label != name) {
+        // this is true for loot floppies
+        addDiskLabelTooltip(tooltip, label)
+      }
+    }
+
+    floppy match {
+      case floppy: FloppyManaged => addSourcePathTooltip(tooltip, floppy)
+      case _ => // unmanaged floppies don't need any special entries
+    }
+
+    addManagedTooltip(tooltip, floppy)
+  }
+
+  override def fillRmbMenu(menu: ContextMenu): Unit = {
+    floppy match {
+      case floppy: FloppyManaged => addSetDirectoryEntry(menu, floppy)
+      case _ => // unmanaged floppies don't need any special entries
+    }
+
+    super.fillRmbMenu(menu)
+  }
+
+  override def factory: FloppyItem.Factory = floppy match {
+    case floppy: LootFloppy =>
+      new FloppyItem.Factory.Loot(new LootFloppyFactory(floppy.name.get, floppy.color, floppy.path))
+
+    case floppy: FloppyManaged =>
+      new FloppyItem.Factory.Managed(floppy.label.labelOption, floppy.color)
+
+    case floppy: FloppyUnmanaged =>
+      new FloppyItem.Factory.Unmanaged(floppy.label.labelOption, floppy.color)
+  }
+}
+
+object FloppyItem {
+  abstract class Factory(val label: Option[String], val color: DyeColor, managed: Boolean) extends ItemFactory {
+    override type I = FloppyItem
+
+    override def itemClass: Class[I] = classOf
+
+    override def name: String = label.getOrElse("Floppy Disk")
+
+    override def tier: Option[Tier] = None
+
+    override def icon: IconDef = Icons.FloppyDisk(color)
+
+    override def recoverers: Iterable[ItemRecoverer[_, _]] = Some(ItemRecoverer(new FloppyItem(_)))
+  }
+
+  object Factory {
+    class Loot(factory: LootFloppyFactory) extends Factory(Some(factory.name), factory.color, managed = true) {
+      override def name: String = factory.name
+
+      override def build(): FloppyItem = new FloppyItem(factory.create())
+    }
+
+    object Empty extends Factory(None, DyeColor.Gray, managed = true) {
+      override def build(): FloppyItem = new FloppyItem(new FloppyManaged)
+    }
+
+    class Managed(label: Option[String], color: DyeColor) extends Factory(label, color, managed = true) {
+      override def build(): FloppyItem = new FloppyItem(new FloppyManaged(label, color))
+    }
+
+    class Unmanaged(label: Option[String], color: DyeColor) extends Factory(label, color, managed = false) {
+      override def build(): FloppyItem = new FloppyItem(new FloppyUnmanaged(label, color))
+    }
+  }
+}

src/main/scala/ocelot/desktop/inventory/item/GraphicsCardItem.scala

@@ -0,0 +1,30 @@
+package ocelot.desktop.inventory.item
+
+import ocelot.desktop.graphics.{IconDef, Icons}
+import ocelot.desktop.inventory.traits.{CardItem, ComponentItem, PersistableItem}
+import ocelot.desktop.inventory.{Item, ItemFactory, ItemRecoverer}
+import totoro.ocelot.brain.entity.GraphicsCard
+import totoro.ocelot.brain.entity.traits.{Entity, Environment}
+import totoro.ocelot.brain.util.Tier.Tier
+
+class GraphicsCardItem(val gpu: GraphicsCard) extends Item with ComponentItem with PersistableItem with CardItem {
+  override def component: Entity with Environment = gpu
+
+  override def factory: GraphicsCardItem.Factory = new GraphicsCardItem.Factory(gpu.tier)
+}
+
+object GraphicsCardItem {
+  class Factory(_tier: Tier) extends ItemFactory {
+    override type I = GraphicsCardItem
+
+    override def itemClass: Class[I] = classOf
+
+    override def name: String = s"Graphics Card (${_tier.label})"
+    override def tier: Option[Tier] = Some(_tier)
+    override def icon: IconDef = Icons.GraphicsCard(_tier)
+
+    override def build(): GraphicsCardItem = new GraphicsCardItem(new GraphicsCard(_tier))
+
+    override def recoverers: Iterable[ItemRecoverer[_, _]] = Some(ItemRecoverer(new GraphicsCardItem(_)))
+  }
+}

src/main/scala/ocelot/desktop/inventory/item/HddItem.scala

@@ -0,0 +1,91 @@
+package ocelot.desktop.inventory.item
+
+import ocelot.desktop.graphics.{IconDef, Icons}
+import ocelot.desktop.inventory.item.HddItem.Hdd
+import ocelot.desktop.inventory.traits.{ComponentItem, DiskItem, PersistableItem}
+import ocelot.desktop.inventory.{Item, ItemFactory, ItemRecoverer}
+import ocelot.desktop.ui.widget.contextmenu.ContextMenu
+import ocelot.desktop.ui.widget.tooltip.ItemTooltip
+import totoro.ocelot.brain.entity.traits.{Disk, Entity, Environment}
+import totoro.ocelot.brain.entity.{HDDManaged, HDDUnmanaged}
+import totoro.ocelot.brain.util.Tier.Tier
+
+class HddItem(val hdd: Hdd) extends Item with ComponentItem with PersistableItem with DiskItem {
+  // constructors for deserialization as required by [[ComponentItem]]
+  def this(hdd: HDDManaged) = {
+    this(Hdd.Managed(hdd))
+  }
+
+  def this(hdd: HDDUnmanaged) = {
+    this(Hdd.Unmanaged(hdd))
+  }
+
+  override def component: Entity with Environment = hdd.hdd
+
+  override def fillTooltip(tooltip: ItemTooltip): Unit = {
+    super.fillTooltip(tooltip)
+
+    val label = hdd match {
+      case Hdd.Managed(hdd) => hdd.fileSystem.label.labelOption
+      case Hdd.Unmanaged(hdd) => hdd.label.labelOption
+    }
+
+    label.foreach(addDiskLabelTooltip(tooltip, _))
+
+    hdd match {
+      case Hdd.Managed(hdd) => addSourcePathTooltip(tooltip, hdd)
+      case Hdd.Unmanaged(_) => // unmanaged HDDs don't need any special entries
+    }
+
+    addManagedTooltip(tooltip, hdd.hdd)
+  }
+
+  override def fillRmbMenu(menu: ContextMenu): Unit = {
+    hdd match {
+      case Hdd.Managed(hdd) =>
+        addSetDirectoryEntry(menu, hdd)
+
+      case _ => // unmanaged HDDs don't need any special entries
+    }
+    super.fillRmbMenu(menu)
+  }
+
+  override def factory: HddItem.Factory = hdd match {
+    case Hdd.Managed(hdd) => new HddItem.Factory(true, hdd.tier)
+    case Hdd.Unmanaged(hdd) => new HddItem.Factory(false, hdd.tier)
+  }
+}
+
+object HddItem {
+  class Factory(managed: Boolean, _tier: Tier) extends ItemFactory {
+    override type I = HddItem
+
+    override def itemClass: Class[I] = classOf
+
+    override def name: String = s"Hard Disk Drive (${_tier.label})"
+
+    override def tier: Option[Tier] = Some(_tier)
+
+    override def icon: IconDef = Icons.HardDiskDrive(_tier)
+
+    override def build(): HddItem = new HddItem(
+      if (managed) Hdd.Managed(new HDDManaged(_tier))
+      else Hdd.Unmanaged(new HDDUnmanaged(_tier))
+    )
+
+    override def recoverers: Iterable[ItemRecoverer[_, _]] = Seq(
+      ItemRecoverer((hdd: HDDManaged) => new HddItem(Hdd.Managed(hdd))),
+      ItemRecoverer((hdd: HDDUnmanaged) => new HddItem(Hdd.Unmanaged(hdd))),
+    )
+  }
+
+  sealed trait Hdd {
+    def hdd: Disk with Entity
+  }
+
+  object Hdd {
+    case class Managed(hdd: HDDManaged) extends Hdd
+
+    case class Unmanaged(hdd: HDDUnmanaged) extends Hdd
+  }
+}

src/main/scala/ocelot/desktop/inventory/item/InternetCardItem.scala

@@ -0,0 +1,33 @@
+package ocelot.desktop.inventory.item
+
+import ocelot.desktop.graphics.{IconDef, Icons}
+import ocelot.desktop.inventory.traits.{CardItem, ComponentItem, PersistableItem}
+import ocelot.desktop.inventory.{Item, ItemFactory, ItemRecoverer}
+import totoro.ocelot.brain.entity.InternetCard
+import totoro.ocelot.brain.entity.traits.{Entity, Environment}
+import totoro.ocelot.brain.util.Tier
+import totoro.ocelot.brain.util.Tier.Tier
+
+class InternetCardItem(val card: InternetCard) extends Item with ComponentItem with PersistableItem with CardItem {
+  override def component: Entity with Environment = card
+
+  override def factory: ItemFactory = InternetCardItem.Factory
+}
+
+object InternetCardItem {
+  object Factory extends ItemFactory {
+    override type I = InternetCardItem
+
+    override def itemClass: Class[InternetCardItem] = classOf
+
+    override def name: String = "Internet Card"
+
+    override def tier: Option[Tier] = Some(Tier.Two)
+
+    override def icon: IconDef = Icons.InternetCard
+
+    override def build(): InternetCardItem = new InternetCardItem(new InternetCard)
+
+    override def recoverers: Iterable[ItemRecoverer[_, _]] = Some(ItemRecoverer(new InternetCardItem(_)))
+  }
+}

src/main/scala/ocelot/desktop/inventory/item/LinkedCardItem.scala

@@ -0,0 +1,54 @@
+package ocelot.desktop.inventory.item
+
+import ocelot.desktop.graphics.{IconDef, Icons}
+import ocelot.desktop.inventory.traits.{CardItem, ComponentItem, PersistableItem}
+import ocelot.desktop.inventory.{Item, ItemFactory, ItemRecoverer}
+import ocelot.desktop.ui.widget.TunnelDialog
+import ocelot.desktop.ui.widget.contextmenu.{ContextMenu, ContextMenuEntry}
+import ocelot.desktop.ui.widget.tooltip.ItemTooltip
+import totoro.ocelot.brain.entity.LinkedCard
+import totoro.ocelot.brain.entity.traits.{Entity, Environment}
+import totoro.ocelot.brain.util.Tier
+import totoro.ocelot.brain.util.Tier.Tier
+
+class LinkedCardItem(val linkedCard: LinkedCard) extends Item with ComponentItem with PersistableItem with CardItem {
+  override def component: Entity with Environment = linkedCard
+
+  override def fillTooltip(tooltip: ItemTooltip): Unit = {
+    super.fillTooltip(tooltip)
+
+    tooltip.addLine(s"Channel: ${linkedCard.tunnel}")
+  }
+
+  override def fillRmbMenu(menu: ContextMenu): Unit = {
+    menu.addEntry(
+      ContextMenuEntry("Set channel") {
+        new TunnelDialog(
+          tunnel => linkedCard.tunnel = tunnel,
+          linkedCard.tunnel,
+        ).show()
+      }
+    )
+    super.fillRmbMenu(menu)
+  }
+
+  override def factory: ItemFactory = LinkedCardItem.Factory
+}
+
+object LinkedCardItem {
+  object Factory extends ItemFactory {
+    override type I = LinkedCardItem
+
+    override def itemClass: Class[I] = classOf
+
+    override def name: String = "Linked Card"
+
+    override def tier: Option[Tier] = Some(Tier.Three)
+
+    override def icon: IconDef = Icons.LinkedCard
+
+    override def build(): LinkedCardItem = new LinkedCardItem(new LinkedCard)
+
+    override def recoverers: Iterable[ItemRecoverer[_, _]] = Some(ItemRecoverer(new LinkedCardItem(_)))
+  }
+}

src/main/scala/ocelot/desktop/inventory/item/MemoryItem.scala

@@ -0,0 +1,33 @@
+package ocelot.desktop.inventory.item
+
+import ocelot.desktop.graphics.{IconDef, Icons}
+import ocelot.desktop.inventory.traits.{ComponentItem, PersistableItem}
+import ocelot.desktop.inventory.{Item, ItemFactory, ItemRecoverer}
+import totoro.ocelot.brain.entity.Memory
+import totoro.ocelot.brain.entity.traits.{Entity, Environment}
+import totoro.ocelot.brain.util.ExtendedTier.ExtendedTier
+import totoro.ocelot.brain.util.Tier.Tier
+
+class MemoryItem(val memory: Memory) extends Item with ComponentItem with PersistableItem {
+  override def component: Entity with Environment = memory
+
+  override def factory: ItemFactory = new MemoryItem.Factory(memory.memoryTier)
+}
+
+object MemoryItem {
+  class Factory(memoryTier: ExtendedTier) extends ItemFactory {
+    override type I = MemoryItem
+
+    override def itemClass: Class[I] = classOf
+
+    override def name: String = s"Memory (${memoryTier.label})"
+
+    override def tier: Option[Tier] = Some(memoryTier.toTier)
+
+    override def icon: IconDef = Icons.Memory(memoryTier)
+
+    override def build(): MemoryItem = new MemoryItem(new Memory(memoryTier))
+
+    override def recoverers: Iterable[ItemRecoverer[_, _]] = Some(ItemRecoverer(new MemoryItem(_)))
+  }
+}

src/main/scala/ocelot/desktop/inventory/item/NetworkCardItem.scala

@@ -0,0 +1,31 @@
+package ocelot.desktop.inventory.item
+
+import ocelot.desktop.graphics.{IconDef, Icons}
+import ocelot.desktop.inventory.traits.{CardItem, ComponentItem, PersistableItem}
+import ocelot.desktop.inventory.{Item, ItemFactory, ItemRecoverer}
+import totoro.ocelot.brain.entity.NetworkCard
+import totoro.ocelot.brain.entity.traits.{Entity, Environment}
+import totoro.ocelot.brain.util.Tier
+import totoro.ocelot.brain.util.Tier.Tier
+
+class NetworkCardItem(val networkCard: NetworkCard) extends Item with ComponentItem with PersistableItem with CardItem {
+  override def component: Entity with Environment = networkCard
+
+  override def factory: ItemFactory = NetworkCardItem.Factory
+}
+
+object NetworkCardItem {
+  object Factory extends ItemFactory {
+    override type I = NetworkCardItem
+
+    override def itemClass: Class[I] = classOf
+
+    override def name: String = "Network Card"
+    override def tier: Option[Tier] = Some(Tier.One)
+    override def icon: IconDef = Icons.NetworkCard
+
+    override def build(): NetworkCardItem = new NetworkCardItem(new NetworkCard)
+
+    override def recoverers: Iterable[ItemRecoverer[_, _]] = Some(ItemRecoverer(new NetworkCardItem(_)))
+  }
+}

src/main/scala/ocelot/desktop/inventory/item/RedstoneCardItem.scala

@@ -0,0 +1,97 @@
+package ocelot.desktop.inventory.item
+
+import ocelot.desktop.graphics.{IconDef, Icons}
+import ocelot.desktop.inventory.traits.{CardItem, ComponentItem, PersistableItem, WindowProvider}
+import ocelot.desktop.inventory.{Item, ItemFactory, ItemRecoverer}
+import ocelot.desktop.ui.widget.card.{Redstone1Window, Redstone2Window}
+import ocelot.desktop.ui.widget.contextmenu.ContextMenu
+import ocelot.desktop.ui.widget.tooltip.ItemTooltip
+import ocelot.desktop.ui.widget.window.Window
+import totoro.ocelot.brain.entity.Redstone
+import totoro.ocelot.brain.entity.traits.{Entity, Environment}
+import totoro.ocelot.brain.util.Tier
+import totoro.ocelot.brain.util.Tier.Tier
+
+abstract class RedstoneCardItem extends Item with ComponentItem with PersistableItem with CardItem
+
+object RedstoneCardItem {
+  abstract class Factory extends ItemFactory {
+    override def name: String = s"Redstone Card (${tier.get.label})"
+
+    override def icon: IconDef = Icons.RedstoneCard(tier.get)
+  }
+
+  class Tier1(val redstoneCard: Redstone.Tier1) extends RedstoneCardItem {
+    private val redstoneIoWindow: WindowProvider = new WindowProvider {
+      override def windowEntryLabel: String = "Redstone I/O"
+
+      override def makeWindow(): Window = new Redstone1Window(redstoneCard)
+    }
+
+    override def component: Entity with Environment = redstoneCard
+
+    protected def addWindowEntries(menu: ContextMenu): Unit = {
+      redstoneIoWindow.fillRmbMenu(menu)
+    }
+
+    override def fillTooltip(tooltip: ItemTooltip): Unit = {
+      super.fillTooltip(tooltip)
+
+      if (redstoneCard.wakeThreshold > 0) {
+        tooltip.addLine(s"Wake threshold: ${redstoneCard.wakeThreshold}")
+      }
+    }
+
+    override def fillRmbMenu(menu: ContextMenu): Unit = {
+      addWindowEntries(menu)
+      super.fillRmbMenu(menu)
+    }
+
+    override def factory: Factory = RedstoneCardItem.Tier1.Factory
+  }
+
+  object Tier1 {
+    object Factory extends Factory {
+      override type I = RedstoneCardItem.Tier1
+
+      override def itemClass: Class[I] = classOf
+
+      override def tier: Option[Tier] = Some(Tier.One)
+
+      override def build(): RedstoneCardItem.Tier1 = new RedstoneCardItem.Tier1(new Redstone.Tier1)
+
+      override def recoverers: Iterable[ItemRecoverer[_, _]] = Some(ItemRecoverer(new RedstoneCardItem.Tier1(_)))
+    }
+  }
+
+  class Tier2(override val redstoneCard: Redstone.Tier2) extends RedstoneCardItem.Tier1(redstoneCard) {
+    private val bundledIoWindow: WindowProvider = new WindowProvider {
+      override def windowEntryLabel: String = "Bundled I/O"
+
+      override def makeWindow(): Window = new Redstone2Window(redstoneCard)
+    }
+
+    override def component: Entity with Environment = redstoneCard
+
+    override def addWindowEntries(menu: ContextMenu): Unit = {
+      super.addWindowEntries(menu)
+      bundledIoWindow.fillRmbMenu(menu)
+    }
+
+    override def factory: Factory = RedstoneCardItem.Tier2.Factory
+  }
+
+  object Tier2 {
+    object Factory extends Factory {
+      override type I = RedstoneCardItem.Tier2
+
+      override def itemClass: Class[I] = classOf
+
+      override def tier: Option[Tier] = Some(Tier.Two)
+
+      override def build(): RedstoneCardItem.Tier2 = new RedstoneCardItem.Tier2(new Redstone.Tier2)
+
+      override def recoverers: Iterable[ItemRecoverer[_, _]] = Some(ItemRecoverer(new RedstoneCardItem.Tier2(_)))
+    }
+  }
+}

src/main/scala/ocelot/desktop/inventory/item/SelfDestructingCardItem.scala

@@ -0,0 +1,38 @@
+package ocelot.desktop.inventory.item
+
+import ocelot.desktop.graphics.{IconDef, Icons}
+import ocelot.desktop.inventory.traits.{CardItem, ComponentItem, PersistableItem}
+import ocelot.desktop.inventory.{Item, ItemFactory, ItemRecoverer}
+import totoro.ocelot.brain.entity.SelfDestructingCard
+import totoro.ocelot.brain.entity.traits.{Entity, Environment}
+import totoro.ocelot.brain.util.Tier
+import totoro.ocelot.brain.util.Tier.Tier
+
+class SelfDestructingCardItem(val card: SelfDestructingCard)
+  extends Item
+    with ComponentItem
+    with PersistableItem
+    with CardItem {
+
+  override def component: Entity with Environment = card
+
+  override def factory: ItemFactory = SelfDestructingCardItem.Factory
+}
+
+object SelfDestructingCardItem {
+  object Factory extends ItemFactory {
+    override type I = SelfDestructingCardItem
+
+    override def itemClass: Class[I] = classOf
+
+    override def name: String = "Self-Destructing Card"
+
+    override def tier: Option[Tier] = Some(Tier.Two)
+
+    override def icon: IconDef = Icons.SelfDestructingCard
+
+    override def build(): SelfDestructingCardItem = new SelfDestructingCardItem(new SelfDestructingCard)
+
+    override def recoverers: Iterable[ItemRecoverer[_, _]] = Some(ItemRecoverer(new SelfDestructingCardItem(_)))
+  }
+}

src/main/scala/ocelot/desktop/inventory/item/SoundCardItem.scala

@@ -0,0 +1,47 @@
+package ocelot.desktop.inventory.item
+
+import ocelot.desktop.graphics.{IconDef, Icons}
+import ocelot.desktop.inventory.traits.{CardItem, ComponentItem, PersistableItem, WindowProvider}
+import ocelot.desktop.inventory.{Item, ItemFactory, ItemRecoverer}
+import ocelot.desktop.ui.widget.card.SoundCardWindow
+import ocelot.desktop.ui.widget.contextmenu.ContextMenu
+import ocelot.desktop.ui.widget.window.Window
+import totoro.ocelot.brain.entity.sound_card.SoundCard
+import totoro.ocelot.brain.entity.traits.{Entity, Environment}
+import totoro.ocelot.brain.util.Tier
+import totoro.ocelot.brain.util.Tier.Tier
+
+class SoundCardItem(val soundCard: SoundCard) extends Item with ComponentItem with PersistableItem with CardItem {
+  private val window = new WindowProvider {
+    override def windowEntryLabel: String = "Open"
+
+    override def makeWindow(): Window = new SoundCardWindow(soundCard)
+  }
+
+  override def component: Entity with Environment = soundCard
+
+  override def fillRmbMenu(menu: ContextMenu): Unit = {
+    window.fillRmbMenu(menu)
+    super.fillRmbMenu(menu)
+  }
+
+  override def factory: ItemFactory = SoundCardItem.Factory
+}
+
+object SoundCardItem {
+  object Factory extends ItemFactory {
+    override type I = SoundCardItem
+
+    override def itemClass: Class[I] = classOf
+
+    override def name: String = "Sound Card"
+
+    override def tier: Option[Tier] = Some(Tier.Two)
+
+    override def icon: IconDef = Icons.SoundCard
+
+    override def build(): SoundCardItem = new SoundCardItem(new SoundCard)
+
+    override def recoverers: Iterable[ItemRecoverer[_, _]] = Some(ItemRecoverer(new SoundCardItem(_)))
+  }
+}

src/main/scala/ocelot/desktop/inventory/item/WirelessNetworkCardItem.scala

@@ -0,0 +1,64 @@
+package ocelot.desktop.inventory.item
+
+import ocelot.desktop.graphics.{IconDef, Icons}
+import ocelot.desktop.inventory.traits.{CardItem, ComponentItem, PersistableItem}
+import ocelot.desktop.inventory.{Item, ItemFactory, ItemRecoverer}
+import totoro.ocelot.brain.entity.WirelessNetworkCard
+import totoro.ocelot.brain.entity.traits.{Entity, Environment}
+import totoro.ocelot.brain.util.Tier
+import totoro.ocelot.brain.util.Tier.Tier
+
+abstract class WirelessNetworkCardItem(val card: WirelessNetworkCard)
+  extends Item
+    with ComponentItem
+    with PersistableItem
+    with CardItem {
+
+  override def component: Entity with Environment = card
+}
+
+object WirelessNetworkCardItem {
+  abstract class Factory extends ItemFactory {
+    override def name: String = s"Wireless Net. Card (${tier.get.label})"
+
+    override def icon: IconDef = Icons.WirelessNetworkCard(tier.get)
+  }
+
+  class Tier1(override val card: WirelessNetworkCard.Tier1) extends WirelessNetworkCardItem(card) {
+    override def factory: Factory = WirelessNetworkCardItem.Tier1.Factory
+  }
+
+  object Tier1 {
+    object Factory extends Factory {
+      override type I = WirelessNetworkCardItem.Tier1
+
+      override def itemClass: Class[I] = classOf
+
+      override def tier: Option[Tier] = Some(Tier.One)
+
+      override def build(): WirelessNetworkCardItem.Tier1 =
+        new WirelessNetworkCardItem.Tier1(new WirelessNetworkCard.Tier1)
+
+      override def recoverers: Iterable[ItemRecoverer[_, _]] = Some(ItemRecoverer(new WirelessNetworkCardItem.Tier1(_)))
+    }
+  }
+
+  class Tier2(override val card: WirelessNetworkCard.Tier2) extends WirelessNetworkCardItem(card) {
+    override def factory: Factory = WirelessNetworkCardItem.Tier2.Factory
+  }
+
+  object Tier2 {
+    object Factory extends Factory {
+      override type I = WirelessNetworkCardItem.Tier2
+
+      override def itemClass: Class[I] = classOf
+
+      override def tier: Option[Tier] = Some(Tier.Two)
+
+      override def build(): WirelessNetworkCardItem.Tier2 =
+        new WirelessNetworkCardItem.Tier2(new WirelessNetworkCard.Tier2)
+
+      override def recoverers: Iterable[ItemRecoverer[_, _]] = Some(ItemRecoverer(new WirelessNetworkCardItem.Tier2(_)))
+    }
+  }
+}

src/main/scala/ocelot/desktop/inventory/traits/CardItem.scala

@@ -0,0 +1,8 @@
+package ocelot.desktop.inventory.traits
+
+import ocelot.desktop.inventory.Item
+
+/**
+  * A marker trait implemented by [[Item]]s that can be put into card slots.
+  */
+trait CardItem extends ComponentItem

src/main/scala/ocelot/desktop/inventory/traits/ComponentItem.scala

@@ -0,0 +1,30 @@
+package ocelot.desktop.inventory.traits
+
+import ocelot.desktop.inventory.Item
+import ocelot.desktop.ui.UiHandler
+import ocelot.desktop.ui.widget.contextmenu.{ContextMenu, ContextMenuEntry}
+import ocelot.desktop.ui.widget.tooltip.ItemTooltip
+import totoro.ocelot.brain.entity.traits.{Entity, Environment}
+
+/**
+  * Implemented by [[Item]]s that wrap a component.
+  *
+  * @note Subclasses must provide a unary constructor that accepts the [[component]].
+  */
+trait ComponentItem extends Item with PersistableItem {
+  def component: Entity with Environment
+
+  override def fillTooltip(tooltip: ItemTooltip): Unit = {
+    super.fillTooltip(tooltip)
+
+    tooltip.addLine(s"Address: ${component.node.address}")
+  }
+
+  override def fillRmbMenu(menu: ContextMenu): Unit = {
+    menu.addEntry(ContextMenuEntry("Copy address") {
+      UiHandler.clipboard = component.node.address
+    })
+
+    super.fillRmbMenu(menu)
+  }
+}

src/main/scala/ocelot/desktop/inventory/traits/CpuLikeItem.scala

@@ -0,0 +1,36 @@
+package ocelot.desktop.inventory.traits
+
+import ocelot.desktop.inventory.Item
+import ocelot.desktop.inventory.traits.CpuLikeItem.CpuArchitectureChangedNotification
+import ocelot.desktop.ui.widget.contextmenu.{ContextMenu, ContextMenuEntry, ContextMenuSubmenu}
+import totoro.ocelot.brain.entity.machine.MachineAPI
+import totoro.ocelot.brain.entity.traits.{Entity, GenericCPU}
+
+/**
+  * An [[Item]] that acts as a CPU and can therefore be inserted into a CPU slot.
+  */
+trait CpuLikeItem extends ComponentItem {
+  override def component: Entity with GenericCPU
+
+  override def fillRmbMenu(menu: ContextMenu): Unit = {
+    menu.addEntry(new ContextMenuSubmenu("Set architecture") {
+      for (arch <- component.allArchitectures) {
+        val name = MachineAPI.getArchitectureName(arch) +
+          (if (arch == component.architecture) " (current)" else "")
+        val entry = ContextMenuEntry(name) {
+          component.setArchitecture(arch)
+          notifySlot(CpuArchitectureChangedNotification)
+        }
+
+        entry.setEnabled(arch != component.architecture)
+        addEntry(entry)
+      }
+    })
+
+    super.fillRmbMenu(menu)
+  }
+}
+
+object CpuLikeItem {
+  case object CpuArchitectureChangedNotification extends Item.Notification
+}

src/main/scala/ocelot/desktop/inventory/traits/DiskItem.scala

@@ -0,0 +1,54 @@
+package ocelot.desktop.inventory.traits
+
+import ocelot.desktop.OcelotDesktop
+import ocelot.desktop.inventory.Item
+import ocelot.desktop.ui.widget.contextmenu.{ContextMenu, ContextMenuEntry}
+import ocelot.desktop.ui.widget.tooltip.ItemTooltip
+import totoro.ocelot.brain.entity.traits.{Disk, DiskManaged, DiskUnmanaged}
+
+import javax.swing.JFileChooser
+import scala.util.Try
+
+/**
+  * A utility mixin for HDDs and floppies.
+  */
+trait DiskItem {
+  this: Item =>
+
+  protected def addSetDirectoryEntry(menu: ContextMenu, disk: DiskManaged): Unit = {
+    menu.addEntry(
+      ContextMenuEntry("Set directory") {
+        OcelotDesktop.showFileChooserDialog(JFileChooser.OPEN_DIALOG, JFileChooser.DIRECTORIES_ONLY) { dir =>
+          Try {
+            for (dir <- dir) {
+              // trigger component_removed / component_added signals
+              val slot = this.slot
+              slot.foreach(_.remove())
+              disk.customRealPath = Some(dir.toPath.toAbsolutePath)
+              slot.foreach(slot => slot.put(this.asInstanceOf[slot.inventory.I]))
+            }
+          }
+        }
+      }
+    )
+
+    // TODO: unset directory?????? anyone?
+  }
+
+  protected def addDiskLabelTooltip(tooltip: ItemTooltip, label: String): Unit = {
+    tooltip.addLine(s"Label: $label")
+  }
+
+  protected def addSourcePathTooltip(tooltip: ItemTooltip, disk: DiskManaged): Unit = {
+    for (customRealPath <- disk.customRealPath) {
+      tooltip.addLine(s"Source path: $customRealPath")
+    }
+  }
+
+  protected def addManagedTooltip(tooltip: ItemTooltip, disk: Disk): Unit = {
+    tooltip.addLine(disk match {
+      case _: DiskManaged => "Mode: managed"
+      case _: DiskUnmanaged => "Mode: unmanaged"
+    })
+  }
+}

src/main/scala/ocelot/desktop/inventory/traits/PersistableItem.scala

@@ -0,0 +1,13 @@
+package ocelot.desktop.inventory.traits
+
+import ocelot.desktop.inventory.Item
+import totoro.ocelot.brain.nbt.NBTTagCompound
+
+/**
+  * Provides serialization and deserialization for an [[Item]].
+  */
+trait PersistableItem extends Item {
+  def load(nbt: NBTTagCompound): Unit = {}
+
+  def save(nbt: NBTTagCompound): Unit = {}
+}

src/main/scala/ocelot/desktop/inventory/traits/WindowProvider.scala

@@ -0,0 +1,26 @@
+package ocelot.desktop.inventory.traits
+
+import ocelot.desktop.ui.UiHandler
+import ocelot.desktop.ui.widget.contextmenu.{ContextMenu, ContextMenuEntry}
+import ocelot.desktop.ui.widget.window.Window
+
+/**
+  * Potentially manages the windows of an [[ocelot.desktop.inventory.Item Item]] that has them (e.g., the sound card).
+  * Though at the moment it just provides a convenient way to add an entry to the item's context menu
+  * for opening a window.
+  */
+trait WindowProvider {
+  def windowEntryLabel: String
+
+  def makeWindow(): Window
+
+  def fillRmbMenu(menu: ContextMenu): Unit = {
+    // TODO: disable the entry while the window is open
+    // TODO: serialize the window
+    menu.addEntry(
+      ContextMenuEntry(windowEntryLabel) {
+        UiHandler.root.workspaceView.windowPool.openWindow(makeWindow())
+      },
+    )
+  }
+}

src/main/scala/ocelot/desktop/node/Node.scala

@@ -4,6 +4,7 @@ import ocelot.desktop.OcelotDesktop
 import ocelot.desktop.color.{Color, RGBAColor}
 import ocelot.desktop.geometry.{Rect2D, Size2D, Vector2D}
 import ocelot.desktop.graphics.Graphics
+import ocelot.desktop.node.Node.{HoveredHighlight, MovingHighlight, NoHighlight}
 import ocelot.desktop.ui.UiHandler
 import ocelot.desktop.ui.event.handlers.{ClickHandler, DragHandler, HoverHandler}
 import ocelot.desktop.ui.event.{ClickEvent, DragEvent, HoverEvent, MouseEvent}
@@ -20,17 +21,20 @@ import totoro.ocelot.brain.util.Direction
 
 import scala.collection.mutable.ArrayBuffer
 
-abstract class Node(val entity: Entity with Environment) extends Widget with DragHandler with ClickHandler with HoverHandler {
+abstract class Node(val entity: Entity with Environment)
+  extends Widget
+    with DragHandler
+    with ClickHandler
+    with HoverHandler {
+
   if (!OcelotDesktop.workspace.getEntitiesIter.contains(entity))
     OcelotDesktop.workspace.add(entity)
 
   var workspaceView: WorkspaceView = _
 
-  protected val MovingHighlight: RGBAColor = RGBAColor(240, 250, 240)
-  protected val HoveredHighlight: RGBAColor = RGBAColor(160, 160, 160)
-  protected val NoHighlight: RGBAColor = RGBAColor(160, 160, 160, 0)
   protected val highlight = new ColorAnimation(RGBAColor(0, 0, 0, 0))
   protected val canOpen = false
+
   protected def exposeAddress = true
 
   protected var isMoving = false
@@ -42,10 +46,12 @@ abstract class Node(val entity: Entity with Environment) extends Widget with Dra
 
   def load(nbt: NBTTagCompound): Unit = {
     position = new Vector2D(nbt.getCompoundTag("pos"))
-    window.foreach(window => {
-      val tag = nbt.getCompoundTag("window")
-      window.load(tag)
-    })
+    window.foreach(
+      window => {
+        val tag = nbt.getCompoundTag("window")
+        window.load(tag)
+      },
+    )
 
     val lbl = nbt.getString("label")
     label = if (lbl == "") None else Some(lbl)
@@ -65,11 +71,13 @@ abstract class Node(val entity: Entity with Environment) extends Widget with Dra
     position.save(posTag)
     nbt.setTag("pos", posTag)
 
-    window.foreach(window => {
-      val tag = new NBTTagCompound
-      window.save(tag)
-      nbt.setTag("window", tag)
-    })
+    window.foreach(
+      window => {
+        val tag = new NBTTagCompound
+        window.save(tag)
+        nbt.setTag("window", tag)
+      },
+    )
 
     nbt.setString("label", label.getOrElse(""))
   }
@@ -110,37 +118,47 @@ abstract class Node(val entity: Entity with Environment) extends Widget with Dra
 
   def setupContextMenu(menu: ContextMenu): Unit = {
     if (exposeAddress) { // TODO: lift the restriction
-      menu.addEntry(new ContextMenuEntry(
-        "Set label",
-        () => new InputDialog(
-          "Set label",
-          text => label = if (text.isEmpty) None else Some(text),
-          label.getOrElse("")
-        ).show()
-      ))
+      menu.addEntry(
+        ContextMenuEntry("Set label") {
+          new InputDialog(
+            "Set label",
+            text => label = if (text.isEmpty) None else Some(text),
+            label.getOrElse(""),
+          ).show()
+        },
+      )
     }
 
     if (exposeAddress && entity.node != null && entity.node.address != null) {
-      menu.addEntry(new ContextMenuEntry("Copy address", () => {
-        UiHandler.clipboard = entity.node.address
-      }))
+      menu.addEntry(
+        ContextMenuEntry("Copy address") {
+          UiHandler.clipboard = entity.node.address
+        }
+      )
     }
 
-    menu.addEntry(new ContextMenuEntry("Disconnect", () => {
-      disconnectFromAll()
-    }))
+    menu.addEntry(
+      ContextMenuEntry("Disconnect") {
+        disconnectFromAll()
+      },
+    )
 
-    menu.addEntry(new ContextMenuEntry("Delete", () => {
-      dispose()
-      workspaceView.nodes = workspaceView.nodes.filter(_ != this)
-    }))
+    menu.addEntry(
+      ContextMenuEntry("Delete") {
+        destroy()
+      },
+    )
   }
 
   override def update(): Unit = {
     super.update()
     if (isHovered || isMoving) {
-      if (canOpen)
-        root.get.statusBar.addMouseEntry("icons/LMB", "Open")
+      if (canOpen) {
+        if (isClosed)
+          root.get.statusBar.addMouseEntry("icons/LMB", "Open")
+        else
+          root.get.statusBar.addMouseEntry("icons/LMB", "Close")
+      }
       root.get.statusBar.addMouseEntry("icons/RMB", "Menu")
       root.get.statusBar.addMouseEntry("icons/DragLMB", "Move node")
       root.get.statusBar.addMouseEntry("icons/DragRMB", "Connect/Disconnect")
@@ -173,6 +191,11 @@ abstract class Node(val entity: Entity with Environment) extends Widget with Dra
     node.onConnectionRemoved(portB, this, portA)
   }
 
+  def destroy(): Unit = {
+    dispose()
+    workspaceView.nodes = workspaceView.nodes.filter(_ != this)
+  }
+
   def disconnectFromAll(): Unit = {
     for ((a, node, b) <- connections.toArray) {
       disconnect(a, node, b)
@@ -194,7 +217,10 @@ abstract class Node(val entity: Entity with Environment) extends Widget with Dra
   def onClick(event: ClickEvent): Unit = {
     event match {
       case ClickEvent(MouseEvent.Button.Left, _) =>
-        window.foreach(window => workspaceView.windowPool.openWindow(window))
+        if (isClosed)
+          window.foreach(workspaceView.windowPool.openWindow(_))
+        else
+          window.foreach(_.hide())
       case ClickEvent(MouseEvent.Button.Right, _) =>
         val menu = new ContextMenu
         setupContextMenu(menu)
@@ -203,6 +229,8 @@ abstract class Node(val entity: Entity with Environment) extends Widget with Dra
     }
   }
 
+  private def isClosed: Boolean = window.exists(!_.isOpen)
+
   def portsBounds: Iterator[(NodePort, Array[Rect2D])] = {
     val length = -4
     val thickness = 4
@@ -221,14 +249,16 @@ abstract class Node(val entity: Entity with Environment) extends Widget with Dra
       val left = Rect2D(centers(3) + Vector2D(-length, -thickness / 2), hsize)
       val centersBounds = Array[Rect2D](top, right, bottom, left)
 
-      val portBounds = (0 until 4).map(side => {
-        val offset = thickness - numPorts * stride / 2 + portIdx * stride
-        val rect = centersBounds(side)
-        side match {
-          case 0 | 2 => rect.mapX(_ + offset)
-          case 1 | 3 => rect.mapY(_ + offset)
-        }
-      })
+      val portBounds = (0 until 4).map(
+        side => {
+          val offset = thickness - numPorts * stride / 2 + portIdx * stride
+          val rect = centersBounds(side)
+          side match {
+            case 0 | 2 => rect.mapX(_ + offset)
+            case 1 | 3 => rect.mapY(_ + offset)
+          }
+        },
+      )
 
       (port, portBounds.toArray)
     }
@@ -251,7 +281,10 @@ abstract class Node(val entity: Entity with Environment) extends Widget with Dra
     val oldPos = position
 
     val desiredPos = if (Keyboard.isKeyDown(Keyboard.KEY_LCONTROL))
-      (pos - workspaceView.cameraOffset).snap(68) + workspaceView.cameraOffset + Vector2D(34 - width / 2, 34 - height / 2)
+      (pos - workspaceView.cameraOffset).snap(68) + workspaceView.cameraOffset + Vector2D(
+        34 - width / 2,
+        34 - height / 2,
+      )
     else
       pos - grabPoint
 
@@ -312,3 +345,9 @@ abstract class Node(val entity: Entity with Environment) extends Widget with Dra
     OcelotDesktop.workspace.remove(entity)
   }
 }
+
+object Node {
+  protected val MovingHighlight: RGBAColor = RGBAColor(240, 250, 240)
+  protected val HoveredHighlight: RGBAColor = RGBAColor(160, 160, 160)
+  protected val NoHighlight: RGBAColor = RGBAColor(160, 160, 160, 0)
+}

src/main/scala/ocelot/desktop/node/NodeRegistry.scala

@@ -1,60 +1,60 @@
 package ocelot.desktop.node
 
-import ocelot.desktop.node.nodes._
-import totoro.ocelot.brain.entity.traits.GenericCamera
-import totoro.ocelot.brain.entity.{Cable, Case, ColorfulLamp, FloppyDiskDrive, IronNoteBlock, NoteBlock, Relay, Screen}
 import ocelot.desktop.entity.{Camera, OpenFMRadio}
+import ocelot.desktop.node.nodes._
+import totoro.ocelot.brain.entity.{Cable, Case, ColorfulLamp, FloppyDiskDrive, IronNoteBlock, NoteBlock, Relay, Screen}
+import totoro.ocelot.brain.util.Tier
 
 import scala.collection.mutable
 
 object NodeRegistry {
   val types: mutable.ArrayBuffer[NodeType] = mutable.ArrayBuffer[NodeType]()
 
-  def register(t: NodeType): Unit = {
+  private def register(t: NodeType): Unit = {
     types += t
   }
 
-  for (tier <- 0 to 2) {
-    register(NodeType("Screen" + tier, "nodes/Screen", tier, () => {
+  for (tier <- Tier.One to Tier.Three) {
+    register(NodeType(s"Screen (${tier.label})", "nodes/Screen", tier) {
       new ScreenNode(new Screen(tier)).setup()
-    }))
+    })
   }
 
-  register(NodeType("Disk Drive", "nodes/DiskDrive", -1, () => {
-    new DiskDriveNode(new FloppyDiskDrive())
-  }))
+  register(NodeType("Disk Drive", "nodes/DiskDrive", None) {
+    new DiskDriveNode(new FloppyDiskDrive(), initDisk = true)
+  })
 
-  for (tier <- 0 to 3) {
-    register(NodeType("Computer" + tier, "nodes/Computer", tier, () => {
+  for (tier <- Tier.One to Tier.Creative) {
+    register(NodeType(s"Computer Case (${tier.label})", "nodes/Computer", tier) {
       new ComputerNode(new Case(tier)).setup()
-    }))
+    })
   }
 
-  register(NodeType("Relay", "nodes/Relay", -1, () => {
+  register(NodeType("Relay", "nodes/Relay", None) {
     new RelayNode(new Relay)
-  }))
+  })
 
-  register(NodeType("Cable", "nodes/Cable", -1, () => {
+  register(NodeType("Cable", "nodes/Cable", None) {
     new CableNode(new Cable)
-  }))
+  })
 
-  register(NodeType("NoteBlock", "nodes/NoteBlock", -1, () => {
+  register(NodeType("Note Block", "nodes/NoteBlock", None) {
     new NoteBlockNode(new NoteBlock)
-  }))
+  })
 
-  register(NodeType("IronNoteBlock", "nodes/IronNoteBlock", -1, () => {
+  register(NodeType("Iron Note Block", "nodes/IronNoteBlock", None) {
     new IronNoteBlockNode(new IronNoteBlock)
-  }))
+  })
 
-  register(NodeType("Camera", "nodes/Camera", -1, () => {
+  register(NodeType("Camera", "nodes/Camera", None) {
     new CameraNode(new Camera)
-  }))
+  })
 
-  register(NodeType("ColorfulLamp", "nodes/Lamp", -1, () => {
+  register(NodeType("Colorful Lamp", "nodes/Lamp", None) {
     new ColorfulLampNode(new ColorfulLamp)
-  }))
+  })
 
-  register(NodeType("OpenFM radio", "nodes/OpenFMRadio", -1, () => {
+  register(NodeType("OpenFM radio", "nodes/OpenFMRadio", None) {
     new OpenFMRadioNode(new OpenFMRadio)
-  }))
+  })
 }

src/main/scala/ocelot/desktop/node/NodeType.scala

@@ -1,5 +1,17 @@
 package ocelot.desktop.node
 
-case class NodeType(name: String, icon: String, tier: Int, factory: () => Node) extends Ordered[NodeType] {
+import totoro.ocelot.brain.util.Tier.Tier
+
+class NodeType(val name: String, val icon: String, val tier: Option[Tier], factory: => Node) extends Ordered[NodeType] {
+  def make(): Node = factory
+
   override def compare(that: NodeType): Int = this.name.compare(that.name)
 }
+
+object NodeType {
+  def apply(name: String, icon: String, tier: Tier)(factory: => Node): NodeType =
+    new NodeType(name, icon, Some(tier), factory)
+
+  def apply(name: String, icon: String, tier: Option[Tier])(factory: => Node): NodeType =
+    new NodeType(name, icon, tier, factory)
+}

src/main/scala/ocelot/desktop/node/NodeTypeWidget.scala

@@ -1,10 +1,12 @@
 package ocelot.desktop.node
 
+import ocelot.desktop.color.Color
 import ocelot.desktop.geometry.Size2D
 import ocelot.desktop.graphics.Graphics
 import ocelot.desktop.ui.event.handlers.{ClickHandler, HoverHandler}
-import ocelot.desktop.ui.event.{ClickEvent, MouseEvent}
+import ocelot.desktop.ui.event.{ClickEvent, HoverEvent, MouseEvent}
 import ocelot.desktop.ui.widget.Widget
+import ocelot.desktop.ui.widget.tooltip.LabelTooltip
 import ocelot.desktop.util.{Spritesheet, TierColor}
 
 class NodeTypeWidget(val nodeType: NodeType) extends Widget with ClickHandler with HoverHandler {
@@ -19,11 +21,29 @@ class NodeTypeWidget(val nodeType: NodeType) extends Widget with ClickHandler wi
 
   eventHandlers += {
     case ClickEvent(MouseEvent.Button.Left, _) => onClick()
+    case HoverEvent(state) =>
+      if (state == HoverEvent.State.Enter) onHoverEnter()
+      else onHoverLeave()
   }
 
+  private val labelTooltip = new LabelTooltip(nodeType.name)
+
+  def onHoverEnter(): Unit =
+      root.get.tooltipPool.addTooltip(labelTooltip)
+
+  def onHoverLeave(): Unit =
+      root.get.tooltipPool.closeTooltip(labelTooltip)
+
   override def draw(g: Graphics): Unit = {
     val size = Spritesheet.spriteSize(nodeType.icon) * 4
-    g.sprite(nodeType.icon, position.x + 34 - size.width / 2, position.y + 34 - size.height / 2, size.width, size.height, TierColor.get(nodeType.tier))
+    g.sprite(
+      nodeType.icon,
+      position.x + 34 - size.width / 2,
+      position.y + 34 - size.height / 2,
+      size.width,
+      size.height,
+      nodeType.tier.map(TierColor.get).getOrElse(Color.White)
+    )
   }
 
   override def update(): Unit = {

src/main/scala/ocelot/desktop/node/nodes/ColorfulLampNode.scala

@@ -9,7 +9,7 @@ import totoro.ocelot.brain.entity.ColorfulLamp
 class ColorfulLampNode(val lamp: ColorfulLamp) extends Node(lamp) {
   private var lastColor: RGBAColor = RGBAColor(0, 0, 0)
   private var mouseHover: Boolean = false
-  override def exposeAddress = mouseHover
+  override def exposeAddress: Boolean = mouseHover
 
   override def draw(g: Graphics): Unit = {
     super.draw(g)

src/main/scala/ocelot/desktop/node/nodes/ComputerNode.scala

@@ -1,46 +1,115 @@
 package ocelot.desktop.node.nodes
 
+import ocelot.desktop.ColorScheme
 import ocelot.desktop.audio._
 import ocelot.desktop.color.Color
+import ocelot.desktop.geometry.Vector2D
 import ocelot.desktop.graphics.Graphics
+import ocelot.desktop.inventory.item._
+import ocelot.desktop.inventory.traits.ComponentItem
+import ocelot.desktop.inventory.{Item, SyncedInventory}
 import ocelot.desktop.node.Node
+import ocelot.desktop.node.nodes.ComputerNode.{ErrorMessageMoveSpeed, MaxErrorMessageDistance}
+import ocelot.desktop.ui.UiHandler
 import ocelot.desktop.ui.event.sources.KeyEvents
 import ocelot.desktop.ui.event.{BrainEvent, ClickEvent, MouseEvent}
+import ocelot.desktop.ui.widget.Label
 import ocelot.desktop.ui.widget.contextmenu.{ContextMenu, ContextMenuEntry, ContextMenuSubmenu}
 import ocelot.desktop.ui.widget.slot._
-import ocelot.desktop.util.{Logging, TierColor}
+import ocelot.desktop.util.{Logging, Messages, TierColor}
 import ocelot.desktop.windows.ComputerWindow
 import org.lwjgl.input.Keyboard
 import totoro.ocelot.brain.Settings
-import totoro.ocelot.brain.entity.traits.{Entity, Environment, Floppy, GenericCPU, Inventory}
-import totoro.ocelot.brain.entity.{CPU, Case, EEPROM, GraphicsCard, HDDManaged, HDDUnmanaged, Memory}
+import totoro.ocelot.brain.entity.Case
+import totoro.ocelot.brain.entity.traits.{Environment, Inventory}
 import totoro.ocelot.brain.event.FileSystemActivityType.Floppy
-import totoro.ocelot.brain.event.{BeepEvent, BeepPatternEvent, FileSystemActivityEvent, MachineCrashEvent, SoundCardAudioEvent}
+import totoro.ocelot.brain.event._
 import totoro.ocelot.brain.loot.Loot
+import totoro.ocelot.brain.nbt.NBTTagCompound
 import totoro.ocelot.brain.util.Tier
+import totoro.ocelot.brain.util.Tier.Tier
 
-import java.nio.ByteBuffer
+import scala.collection.mutable
+import scala.math.Ordering.Implicits.infixOrderingOps
 import scala.reflect.ClassTag
 import scala.util.Random
 
-class ComputerNode(val computer: Case) extends Node(computer) with Logging {
-  var eepromSlot: EEPROMSlot = _
-  var cpuSlot: CPUSlot = _
-  var memorySlots: Array[MemorySlot] = _
-  var cardSlots: Array[CardSlot] = _
-  var diskSlots: Array[DiskSlot] = _
-  var floppySlot: Option[FloppySlot] = None
+class ComputerNode(val computer: Case) extends Node(computer) with Logging with SyncedInventory {
+  node =>
 
-  private val soundComputerRunning = SoundSource.fromBuffer(SoundBuffers.MachineComputerRunning, SoundCategory.Environment, looping = true)
+  override type I = Item with ComponentItem
+
+  var eepromSlot: EepromSlotWidget = _
+  var cpuSlot: CpuSlotWidget = _
+  var memorySlots: Array[MemorySlotWidget] = Array.empty
+  var cardSlots: Array[CardSlotWidget] = Array.empty
+  var diskSlots: Array[HddSlotWidget] = Array.empty
+  var floppySlot: Option[FloppySlotWidget] = None
+
+  override def brainInventory: Inventory = computer.inventory.owner
+
+  private def slots: IterableOnce[SlotWidget[I]] = (
+    // slots may be null during initialization
+    Option(eepromSlot).iterator ++
+      Option(cpuSlot).iterator ++
+      memorySlots.iterator ++
+      cardSlots.iterator ++
+      diskSlots.iterator ++
+      floppySlot.iterator
+    ).map(_.asInstanceOf[SlotWidget[I]])
+
+  // NOTE: `soundComputerRunning` must be lazy so that it doesn't get loaded before the audio subsystem is initialized
+  private lazy val soundComputerRunning = SoundSource.fromBuffer(
+    SoundBuffers.MachineComputerRunning,
+    SoundCategory.Environment,
+    looping = true,
+  )
+  // TODO: Scala has lazy vals. Use them.
   private var soundCardStream: SoundStream = _
   private var soundCardSource: SoundSource = _
 
   setupSlots()
-  refitSlots()
+
+  override def load(nbt: NBTTagCompound): Unit = {
+    super[Node].load(nbt)
+    super[SyncedInventory].load(nbt)
+  }
+
+  override def save(nbt: NBTTagCompound): Unit = {
+    super[Node].save(nbt)
+    super[SyncedInventory].save(nbt)
+  }
+
+  private class ErrorMessageLabel(override val text: String) extends Label {
+    override def isSmall: Boolean = true
+
+    var alpha: Float = 1f
+
+    override def color: Color = ColorScheme("ErrorMessage").toRGBANorm.mapA(_ * alpha)
+
+    val initialPosition: Vector2D = {
+      val position = node.position
+      val size = node.size
+
+      position + Vector2D(size.width / 2 - minimumSize.width / 2, -minimumSize.height)
+    }
+
+    position = initialPosition
+  }
 
   eventHandlers += {
     case BrainEvent(event: MachineCrashEvent) =>
-      logger.info(s"[EVENT] Machine crash! (address = ${event.address}, ${event.message})")
+      val message = Messages.lift(event.message) match {
+        case Some(message) =>
+          logger.info(s"[EVENT] Machine crash (address = ${event.address})! Message code ${event.message}: $message")
+          message
+
+        case None =>
+          logger.info(s"[EVENT] Machine crash (address = ${event.address})! Message: ${event.message}")
+          event.message
+      }
+
+      addErrorMessage(new ErrorMessageLabel(message))
 
     case BrainEvent(event: BeepEvent) if !Audio.isDisabled =>
       BeepGenerator.newBeep(".", event.frequency, event.duration).play()
@@ -49,8 +118,10 @@ class ComputerNode(val computer: Case) extends Node(computer) with Logging {
       BeepGenerator.newBeep(event.pattern, 1000, 200).play()
 
     case BrainEvent(event: FileSystemActivityEvent) if !Audio.isDisabled =>
-      val soundFloppyAccess = SoundBuffers.MachineFloppyAccess.map(buffer => SoundSource.fromBuffer(buffer, SoundCategory.Environment))
-      val soundHDDAccess = SoundBuffers.MachineHDDAccess.map(buffer => SoundSource.fromBuffer(buffer, SoundCategory.Environment))
+      val soundFloppyAccess = SoundBuffers.MachineFloppyAccess
+        .map(buffer => SoundSource.fromBuffer(buffer, SoundCategory.Environment))
+      val soundHDDAccess = SoundBuffers.MachineHDDAccess
+        .map(buffer => SoundSource.fromBuffer(buffer, SoundCategory.Environment))
       val sound = if (event.activityType == Floppy) soundFloppyAccess else soundHDDAccess
       sound(Random.between(0, sound.length)).play()
 
@@ -63,19 +134,31 @@ class ComputerNode(val computer: Case) extends Node(computer) with Logging {
       }
       soundCardStream.enqueue(samples)
       soundCardSource.volume = event.volume
+
+    case BrainEvent(_: SelfDestructingCardBoomEvent) =>
+      computer.workspace.runLater(
+        () => {
+          SoundSources.MinecraftExplosion.play()
+          destroy()
+        },
+      )
   }
 
   override def shouldReceiveEventsFor(address: String): Boolean = super.shouldReceiveEventsFor(address) ||
     computer.inventory.entities.exists { case env: Environment => env.node.address == address }
 
   def setup(): ComputerNode = {
-    cpuSlot.owner.put(new CPU(computer.tier.min(2)))
-    memorySlots(0).owner.put(new Memory(computer.tier.min(2) * 2 + 1))
-    memorySlots(1).owner.put(new Memory(computer.tier.min(2) * 2 + 1))
-    cardSlots(0).owner.put(new GraphicsCard(computer.tier.min(1)))
-    floppySlot.map(_.owner).foreach(_.put(Loot.OpenOsFloppy.create()))
-    eepromSlot.owner.put(Loot.LuaBiosEEPROM.create())
-    refitSlots()
+    cpuSlot.item = new CpuItem.Factory(computer.tier min Tier.Three).build()
+    memorySlots(0).item = new MemoryItem.Factory((computer.tier min Tier.Three).toExtended(true)).build()
+    memorySlots(1).item = new MemoryItem.Factory((computer.tier min Tier.Three).toExtended(true)).build()
+    cardSlots(0).item = new GraphicsCardItem.Factory(computer.tier min Tier.Two).build()
+
+    for (floppySlot <- floppySlot) {
+      floppySlot.item = new FloppyItem.Factory.Loot(Loot.OpenOsFloppy).build()
+    }
+
+    eepromSlot.item = new EepromItem.Factory.Loot(Loot.LuaBiosEEPROM).build()
+
     this
   }
 
@@ -99,20 +182,36 @@ class ComputerNode(val computer: Case) extends Node(computer) with Logging {
 
   override def setupContextMenu(menu: ContextMenu): Unit = {
     if (isRunning) {
-      menu.addEntry(new ContextMenuEntry("Turn off", () => turnOff()))
-      menu.addEntry(new ContextMenuEntry("Reboot", () => {
-        computer.turnOff()
-        computer.turnOn()
-      }))
-    } else
-      menu.addEntry(new ContextMenuEntry("Turn on", () => turnOn()))
+      menu.addEntry(
+        ContextMenuEntry("Turn off") {
+          turnOff()
+        },
+      )
+      menu.addEntry(
+        ContextMenuEntry("Reboot") {
+          computer.turnOff()
+          computer.turnOn()
+        },
+      )
+    } else {
+      menu.addEntry(
+        ContextMenuEntry("Turn on") {
+          turnOn()
+        },
+      )
+    }
 
-    menu.addEntry(new ContextMenuSubmenu("Set tier") {
-      addEntry(new ContextMenuEntry("Tier 1", () => changeTier(Tier.One)))
-      addEntry(new ContextMenuEntry("Tier 2", () => changeTier(Tier.Two)))
-      addEntry(new ContextMenuEntry("Tier 3", () => changeTier(Tier.Three)))
-      addEntry(new ContextMenuEntry("Creative", () => changeTier(Tier.Four)))
-    })
+    menu.addEntry(
+      new ContextMenuSubmenu("Set tier") {
+        for (tier <- Tier.One to Tier.Creative) {
+          addEntry(
+            ContextMenuEntry(tier.label) {
+              changeTier(tier)
+            },
+          )
+        }
+      },
+    )
 
     menu.addSeparator()
     super.setupContextMenu(menu)
@@ -121,107 +220,63 @@ class ComputerNode(val computer: Case) extends Node(computer) with Logging {
   override def onClick(event: ClickEvent): Unit = {
     event match {
       case ClickEvent(MouseEvent.Button.Left, _) =>
-        if (KeyEvents.isDown(Keyboard.KEY_LSHIFT))
-          if (isRunning)
+        if (KeyEvents.isDown(Keyboard.KEY_LSHIFT)) {
+          if (isRunning) {
             turnOff()
-          else
+          } else {
             turnOn()
-        else
+          }
+        } else {
           super.onClick(event)
+        }
+
       case event => super.onClick(event)
     }
   }
 
-  private def changeTier(n: Int): Unit = {
-    computer.tier = n
+  private def changeTier(tier: Tier): Unit = {
+    computer.tier = tier
+
+    val items = slots.iterator.flatMap(_.item).toArray
+    clearInventory()
     setupSlots()
-    refitSlots()
-    if (currentWindow != null) currentWindow.updateSlots()
-  }
+    insertItems(items)
 
-  private def slotAccepts(slot: Inventory#Slot, entity: Entity): Boolean = entity match {
-    case cpu: GenericCPU => cpuSlot.owner.index == slot.index && cpuSlot.tier >= cpu.cpuTier
-    case mem: Memory => memorySlots
-      .exists(memSlot => memSlot.owner.index == slot.index && memSlot.tier >= (mem.tier + 1) / 2 - 1)
-    case hdd: HDDManaged => diskSlots
-      .exists(diskSlot => diskSlot.owner.index == slot.index && diskSlot.tier >= hdd.tier)
-    case hdd: HDDUnmanaged => diskSlots
-      .exists(diskSlot => diskSlot.owner.index == slot.index && diskSlot.tier >= hdd.tier)
-    case _: EEPROM => eepromSlot.owner.index == slot.index
-    case _: Floppy => floppySlot.exists(_.owner.index == slot.index)
-    case card: Entity => cardSlots
-      .exists(cardSlot => cardSlot.owner.index == slot.index && cardSlot.tier >= CardRegistry.getTier(card))
-  }
-
-  private def isSlotValid(slot: Inventory#Slot): Boolean = slot.get.exists(slotAccepts(slot, _))
-
-  private def reloadSlots(): Unit = {
-    cpuSlot.reloadItem()
-    memorySlots.foreach(_.reloadItem())
-    cardSlots.foreach(_.reloadItem())
-    diskSlots.foreach(_.reloadItem())
-    eepromSlot.reloadItem()
-    floppySlot.foreach(_.reloadItem())
-  }
-
-  private def refitSlots(): Unit = {
-    if (computer.inventory.forall(isSlotValid)) {
-      reloadSlots()
-
-      return
+    if (currentWindow != null) {
+      currentWindow.reloadWindow()
     }
+  }
 
-    val entities = computer.inventory.entities.toArray
-    computer.inventory.clear()
-
-    cpuSlot._item = None
-    for (slot <- memorySlots) slot._item = None
-    for (slot <- cardSlots) slot._item = None
-    for (slot <- diskSlots) slot._item = None
-    eepromSlot._item = None
-    floppySlot.foreach(_._item = None)
-
-    def findBestSlot[T <: InventorySlot[_]](entity: Entity, candidates: Array[T], tierProvider: T => Option[Int]): Option[T] = {
+  private def insertItems(items: IterableOnce[I]): Unit = {
+    def findBestSlot[A <: I](item: A, candidates: IterableOnce[SlotWidget[A]]): Option[SlotWidget[A]] = {
       candidates.iterator
-        .filter(_.owner.isEmpty)
-        .filter(slot => slotAccepts(slot.owner, entity))
-        .minByOption(tierProvider(_).getOrElse(Int.MinValue))
+        .filter(_.item.isEmpty)
+        .filter(_.isItemAccepted(item.factory))
+        .minByOption(_.slotTier)
     }
 
-    for (entity <- entities) {
-      val newSlot = entity match {
-        case _: GenericCPU => findBestSlot[CPUSlot](entity, Array(cpuSlot), slot => Some(slot.tier))
-        case _: Memory => findBestSlot[MemorySlot](entity, memorySlots, slot => Some(slot.tier))
-        case _: HDDManaged => findBestSlot[DiskSlot](entity, diskSlots, slot => Some(slot.tier))
-        case _: HDDUnmanaged => findBestSlot[DiskSlot](entity, diskSlots, slot => Some(slot.tier))
-        case _: EEPROM => findBestSlot[EEPROMSlot](entity, Array(eepromSlot), _ => None)
-        case _: Floppy => findBestSlot[FloppySlot](entity, floppySlot.toArray, _ => None)
-        case _: Entity => findBestSlot[CardSlot](entity, cardSlots, slot => Some(slot.tier))
-      }
-
-      newSlot.foreach(_.owner.put(entity))
+    for (item <- items; newSlot <- findBestSlot(item, slots)) {
+      newSlot.item = item
     }
-
-    reloadSlots()
   }
 
   private def setupSlots(): Unit = {
     var slotIndex = 0
 
-    def nextSlot(): computer.Slot = {
-      val result = computer.inventory(slotIndex)
+    def nextSlot(): Slot = {
+      val result = Slot(slotIndex)
       slotIndex += 1
       result
     }
 
-    def addSlot[T <: InventorySlot[_]](factory: computer.Slot => T): T = {
+    def addSlot[T <: SlotWidget[_]](factory: Slot => T): T = {
       val slot = nextSlot()
       val widget = factory(slot)
 
       widget
     }
 
-    def addSlots[T <: InventorySlot[_] : ClassTag](factories: (computer.Slot => T)*): Array[T] = {
+    def addSlots[T <: SlotWidget[_] : ClassTag](factories: (Slot => T)*): Array[T] = {
       val array = Array.newBuilder[T]
 
       for (factory <- factories) {
@@ -231,43 +286,51 @@ class ComputerNode(val computer: Case) extends Node(computer) with Logging {
       array.result()
     }
 
+    for (slot <- slots) {
+      slot.dispose()
+    }
+
     computer.tier match {
       case Tier.One =>
-        cardSlots = addSlots(new CardSlot(_, Tier.One), new CardSlot(_, Tier.One))
-        memorySlots = addSlots(new MemorySlot(_, Tier.One))
-        diskSlots = addSlots(new DiskSlot(_, Tier.One))
+        cardSlots = addSlots(new CardSlotWidget(_, Tier.One), new CardSlotWidget(_, Tier.One))
+        memorySlots = addSlots(new MemorySlotWidget(_, Tier.One))
+        diskSlots = addSlots(new HddSlotWidget(_, Tier.One))
         floppySlot = None
-        cpuSlot = addSlot(new CPUSlot(_, this, Tier.One))
+        cpuSlot = addSlot(new CpuSlotWidget(_, this, Tier.One))
         // no idea why on earth the memory slots are split in two here
-        memorySlots :+= addSlot(new MemorySlot(_, Tier.One))
-        eepromSlot = addSlot(new EEPROMSlot(_))
+        memorySlots :+= addSlot(new MemorySlotWidget(_, Tier.One))
+        eepromSlot = addSlot(new EepromSlotWidget(_))
 
       case Tier.Two =>
-        cardSlots = addSlots(new CardSlot(_, Tier.Two), new CardSlot(_, Tier.One))
-        memorySlots = addSlots(new MemorySlot(_, Tier.Two), new MemorySlot(_, Tier.Two))
-        diskSlots = addSlots(new DiskSlot(_, Tier.Two), new DiskSlot(_, Tier.One))
+        cardSlots = addSlots(new CardSlotWidget(_, Tier.Two), new CardSlotWidget(_, Tier.One))
+        memorySlots = addSlots(new MemorySlotWidget(_, Tier.Two), new MemorySlotWidget(_, Tier.Two))
+        diskSlots = addSlots(new HddSlotWidget(_, Tier.Two), new HddSlotWidget(_, Tier.One))
         floppySlot = None
-        cpuSlot = addSlot(new CPUSlot(_, this, Tier.Two))
-        eepromSlot = addSlot(new EEPROMSlot(_))
+        cpuSlot = addSlot(new CpuSlotWidget(_, this, Tier.Two))
+        eepromSlot = addSlot(new EepromSlotWidget(_))
 
       case _ =>
         cardSlots = if (computer.tier == Tier.Three) {
-          addSlots(new CardSlot(_, Tier.Three), new CardSlot(_, Tier.Two), new CardSlot(_, Tier.Two))
+          addSlots(new CardSlotWidget(_, Tier.Three), new CardSlotWidget(_, Tier.Two), new CardSlotWidget(_, Tier.Two))
         } else {
-          addSlots(new CardSlot(_, Tier.Three), new CardSlot(_, Tier.Three), new CardSlot(_, Tier.Three))
+          addSlots(
+            new CardSlotWidget(_, Tier.Three),
+            new CardSlotWidget(_, Tier.Three),
+            new CardSlotWidget(_, Tier.Three),
+          )
         }
 
-        memorySlots = addSlots(new MemorySlot(_, Tier.Three), new MemorySlot(_, Tier.Three))
+        memorySlots = addSlots(new MemorySlotWidget(_, Tier.Three), new MemorySlotWidget(_, Tier.Three))
 
         diskSlots = if (computer.tier == Tier.Three) {
-          addSlots(new DiskSlot(_, Tier.Three), new DiskSlot(_, Tier.Two))
+          addSlots(new HddSlotWidget(_, Tier.Three), new HddSlotWidget(_, Tier.Two))
         } else {
-          addSlots(new DiskSlot(_, Tier.Three), new DiskSlot(_, Tier.Three))
+          addSlots(new HddSlotWidget(_, Tier.Three), new HddSlotWidget(_, Tier.Three))
         }
 
-        floppySlot = Some(addSlot(new FloppySlot(_)))
-        cpuSlot = addSlot(new CPUSlot(_, this, Tier.Three))
-        eepromSlot = addSlot(new EEPROMSlot(_))
+        floppySlot = Some(addSlot(new FloppySlotWidget(_)))
+        cpuSlot = addSlot(new CpuSlotWidget(_, this, Tier.Three))
+        eepromSlot = addSlot(new EepromSlotWidget(_))
     }
   }
 
@@ -288,10 +351,21 @@ class ComputerNode(val computer: Case) extends Node(computer) with Logging {
 
   override def update(): Unit = {
     super.update()
-    if (!isRunning && soundComputerRunning.isPlaying)
+
+    if (!isRunning && soundComputerRunning.isPlaying) {
       soundComputerRunning.stop()
-    if (isHovered || isMoving)
+    } else if (isRunning && !soundComputerRunning.isPlaying && !Audio.isDisabled) {
+      soundComputerRunning.play()
+    }
+
+    if (isHovered || isMoving) {
       root.get.statusBar.addKeyMouseEntry("icons/LMB", "SHIFT", if (isRunning) "Turn Off" else "Turn On")
+    }
+  }
+
+  override def dispose(): Unit = {
+    super.dispose()
+    soundComputerRunning.stop()
   }
 
   private var currentWindow: ComputerWindow = _
@@ -303,4 +377,25 @@ class ComputerNode(val computer: Case) extends Node(computer) with Logging {
     } else Some(currentWindow)
   }
 
+  private val messages = mutable.ArrayBuffer[(Float, ErrorMessageLabel)]()
+
+  private def addErrorMessage(message: ErrorMessageLabel): Unit = synchronized {
+    messages += ((0f, message))
+  }
+
+  override def drawParticles(g: Graphics): Unit = synchronized {
+    for ((time, message) <- messages.reverseIterator) {
+      message.position = message.initialPosition + Vector2D(0, -MaxErrorMessageDistance * time)
+      message.alpha = 1 - time
+      message.draw(g)
+    }
+
+    messages.mapInPlace { case (t, message) => (t + ErrorMessageMoveSpeed * UiHandler.dt, message) }
+    messages.filterInPlace(_._1 <= 1f)
+  }
+}
+
+object ComputerNode {
+  private val MaxErrorMessageDistance: Float = 50
+  private val ErrorMessageMoveSpeed: Float = 0.5f
 }

src/main/scala/ocelot/desktop/node/nodes/DiskDriveNode.scala

@@ -2,57 +2,83 @@ package ocelot.desktop.node.nodes
 
 import ocelot.desktop.color.IntColor
 import ocelot.desktop.graphics.Graphics
+import ocelot.desktop.inventory.SyncedInventory
+import ocelot.desktop.inventory.item.FloppyItem
 import ocelot.desktop.node.Node
-import ocelot.desktop.ui.widget.slot.FloppySlot
+import ocelot.desktop.ui.widget.slot.FloppySlotWidget
 import ocelot.desktop.windows.DiskDriveWindow
 import totoro.ocelot.brain.entity.FloppyDiskDrive
-import totoro.ocelot.brain.entity.traits.Floppy
+import totoro.ocelot.brain.entity.traits.Inventory
 import totoro.ocelot.brain.loot.Loot
+import totoro.ocelot.brain.nbt.NBTTagCompound
 import totoro.ocelot.brain.util.DyeColor
 
-class DiskDriveNode(val diskDrive: FloppyDiskDrive) extends Node(diskDrive) {
-  val slot: FloppySlot = new FloppySlot(diskDrive.inventory(0))
-  slot.item = floppy.getOrElse(Loot.OpenOsFloppy.create())
+class DiskDriveNode(val diskDrive: FloppyDiskDrive, initDisk: Boolean) extends Node(diskDrive) with SyncedInventory {
+  def this(diskDrive: FloppyDiskDrive) = {
+    this(diskDrive, false)
+  }
+
+  override type I = FloppyItem
+
+  override def brainInventory: Inventory = diskDrive.inventory.owner
+
+  val slot: FloppySlotWidget = new FloppySlotWidget(Slot(0))
+
+  if (initDisk) {
+    slot.item = new FloppyItem.Factory.Loot(Loot.OpenOsFloppy).build()
+  }
+
+  override def load(nbt: NBTTagCompound): Unit = {
+    super[Node].load(nbt)
+    super[SyncedInventory].load(nbt)
+  }
+
+  override def save(nbt: NBTTagCompound): Unit = {
+    super[Node].save(nbt)
+    super[SyncedInventory].save(nbt)
+  }
 
   override def icon: String = "nodes/DiskDrive"
 
   override protected val canOpen = true
 
   private val colorMap: Map[DyeColor, Int] = Map(
-    DyeColor.BLACK -> 0x444444, // 0x1E1B1B
-    DyeColor.RED -> 0xB3312C,
-    DyeColor.GREEN -> 0x339911, // 0x3B511A
-    DyeColor.BROWN -> 0x51301A,
-    DyeColor.BLUE -> 0x6666FF, // 0x253192
-    DyeColor.PURPLE -> 0x7B2FBE,
-    DyeColor.CYAN -> 0x66FFFF, // 0x287697
-    DyeColor.SILVER -> 0xABABAB,
-    DyeColor.GRAY -> 0x666666, // 0x434343
-    DyeColor.PINK -> 0xD88198,
-    DyeColor.LIME -> 0x66FF66, // 0x41CD34
-    DyeColor.YELLOW -> 0xFFFF66, // 0xDECF2A
-    DyeColor.LIGHT_BLUE -> 0xAAAAFF, // 0x6689D3
-    DyeColor.MAGENTA -> 0xC354CD,
-    DyeColor.ORANGE -> 0xEB8844,
-    DyeColor.WHITE -> 0xF0F0F0
+    DyeColor.Black -> 0x444444, // 0x1E1B1B
+    DyeColor.Red -> 0xB3312C,
+    DyeColor.Green -> 0x339911, // 0x3B511A
+    DyeColor.Brown -> 0x51301A,
+    DyeColor.Blue -> 0x6666FF, // 0x253192
+    DyeColor.Purple -> 0x7B2FBE,
+    DyeColor.Cyan -> 0x66FFFF, // 0x287697
+    DyeColor.Silver -> 0xABABAB,
+    DyeColor.Gray -> 0x666666, // 0x434343
+    DyeColor.Pink -> 0xD88198,
+    DyeColor.Lime -> 0x66FF66, // 0x41CD34
+    DyeColor.Yellow -> 0xFFFF66, // 0xDECF2A
+    DyeColor.LightBlue -> 0xAAAAFF, // 0x6689D3
+    DyeColor.Magenta -> 0xC354CD,
+    DyeColor.Orange -> 0xEB8844,
+    DyeColor.White -> 0xF0F0F0
   )
 
   override def draw(g: Graphics): Unit = {
     super.draw(g)
 
-    if (System.currentTimeMillis() - diskDrive.lastDiskAccess < 400 && Math.random() > 0.1)
+    if (System.currentTimeMillis() - diskDrive.lastDiskAccess < 400 && Math.random() > 0.1) {
       g.sprite("nodes/DiskDriveActivity", position.x + 2, position.y + 2, size.width - 4, size.height - 4)
+    }
 
-    if (slot.item.isDefined)
-      g.sprite("nodes/DiskDriveFloppy", position.x + 2, position.y + 2, size.width - 4, size.height - 4, IntColor(colorMap(slot.item.get.color)))
+    for (item <- slot.item) {
+      g.sprite(
+        "nodes/DiskDriveFloppy",
+        position.x + 2,
+        position.y + 2,
+        size.width - 4,
+        size.height - 4,
+        IntColor(colorMap(item.color)),
+      )
+    }
   }
 
   override val window: Option[DiskDriveWindow] = Some(new DiskDriveWindow(this))
-
-  private def floppy: Option[Floppy] = {
-    diskDrive.inventory(0).get match {
-      case Some(floppy: Floppy) => Some(floppy)
-      case _ => None
-    }
-  }
 }

src/main/scala/ocelot/desktop/node/nodes/NoteBlockNode.scala

@@ -12,7 +12,9 @@ class NoteBlockNode(val noteBlock: NoteBlock) extends NoteBlockNodeBase(noteBloc
         val maxLen = NoteBlockNode.Instruments.map(_._2.length).max
         for ((instrument, name) <- NoteBlockNode.Instruments) {
           val dot = if (noteBlock.instrument == instrument) '•' else ' '
-          addEntry(new ContextMenuEntry(name.padTo(maxLen, ' ') + dot, () => noteBlock.instrument = instrument))
+          addEntry(ContextMenuEntry(name.padTo(maxLen, ' ') + dot) {
+            noteBlock.instrument = instrument
+          })
         }
       }
     })

src/main/scala/ocelot/desktop/node/nodes/NoteBlockNodeBase.scala

@@ -22,7 +22,7 @@ abstract class NoteBlockNodeBase(entity: Entity with Environment) extends Node(e
 
   private val particles = mutable.ArrayBuffer[(Float, Int)]()
 
-  def addParticle(pitch: Int): Unit = {
+  private def addParticle(pitch: Int): Unit = {
     synchronized {
       particles += ((0f, pitch))
     }

src/main/scala/ocelot/desktop/node/nodes/ScreenNode.scala

@@ -50,9 +50,9 @@ class ScreenNode(val screen: Screen) extends Node(screen) {
 
   override def setupContextMenu(menu: ContextMenu): Unit = {
     if (screen.getPowerState)
-      menu.addEntry(new ContextMenuEntry("Turn off", () => screen.setPowerState(false)))
+      menu.addEntry(ContextMenuEntry("Turn off") { screen.setPowerState(false) })
     else
-      menu.addEntry(new ContextMenuEntry("Turn on", () => screen.setPowerState(true)))
+      menu.addEntry(ContextMenuEntry("Turn on") { screen.setPowerState(true) })
 
     menu.addSeparator()
     super.setupContextMenu(menu)

src/main/scala/ocelot/desktop/ui/UiHandler.scala

@@ -1,8 +1,8 @@
 package ocelot.desktop.ui
 
 import buildinfo.BuildInfo
-import ocelot.desktop.audio.Audio
-import ocelot.desktop.geometry.{Size2D, Vector2D}
+import ocelot.desktop.audio.{Audio, SoundBuffers}
+import ocelot.desktop.geometry.{Rect2D, Size2D, Vector2D}
 import ocelot.desktop.graphics.Graphics
 import ocelot.desktop.ui.event.MouseEvent
 import ocelot.desktop.ui.event.handlers.HoverHandler
@@ -34,8 +34,9 @@ object UiHandler extends Logging {
   private var shouldUpdateHierarchy = true
   private val fpsCalculator = new FPSCalculator
   private val ticker = new Ticker
+  var scalingFactor = 1.0f
 
-  ticker.tickInterval = 1.second / 60
+  ticker.tickInterval = 1.second / 144
 
   def getHierarchy: Array[Widget] = hierarchy.toArray
 
@@ -62,7 +63,7 @@ object UiHandler extends Logging {
   def dt: Float = fpsCalculator.dt
 
   def mousePosition: Vector2D = {
-    Vector2D(Mouse.getX, Display.getHeight - Mouse.getY)
+    Vector2D(Mouse.getX, Display.getHeight - Mouse.getY) / scalingFactor
   }
 
   private val _clipboard = Toolkit.getDefaultToolkit.getSystemClipboard
@@ -80,19 +81,25 @@ object UiHandler extends Logging {
     _clipboard.setContents(data, data)
   }
 
-  def isFullScreen: Boolean = Display.isFullscreen
+  def fullScreen: Boolean = Display.isFullscreen
 
-  def isFullScreen_=(value: Boolean): Any = {
+  def fullScreen_=(value: Boolean): Unit = {
     if (value) {
       Display.setDisplayModeAndFullscreen(Display.getDesktopDisplayMode)
     }
     else {
       // Updating size from settings
       val settingsSize = Settings.get.windowSize
-      root.size = if (settingsSize.isSet) Size2D(settingsSize.x, settingsSize.y) else Size2D(800, 600)
+
+      val unscaledSize = sanitizeWindowSize(
+        if (settingsSize.isSet) Size2D(settingsSize.x, settingsSize.y)
+        else Size2D(800, 600)
+      )
+
+      root.size = unscaledSize / scalingFactor
 
       // Setting normal display mode (non-fullscreen by default)
-      Display.setDisplayMode(new DisplayMode(root.size.width.toInt, root.size.height.toInt))
+      Display.setDisplayMode(new DisplayMode(unscaledSize.width.toInt, unscaledSize.height.toInt))
 
       // Updating position from settings
       if (Settings.get.windowPosition.isSet) {
@@ -131,39 +138,100 @@ object UiHandler extends Logging {
     Settings.get.windowFullscreen = value
   }
 
+  private def formatRect(rect: Rect2D): String = {
+    val Rect2D(x, y, w, h) = rect
+
+    f"$w%.0f×$h%.0f$x%+.0f$y%+.0f"
+  }
+
+  private def windowGeometry: Rect2D = new Rect2D(Display.getX, Display.getY, Display.getWidth, Display.getHeight)
+
+  private def sanitizeWindowSize(size: Size2D): Size2D =
+    Size2D(
+      if (size.width < 10) 800 else size.width,
+      if (size.height < 10) 600 else size.height,
+    )
+
+  private def sanitizeWindowGeometry(currentGeometry: Rect2D): Rect2D = {
+    val Rect2D(x, y, w, h) = currentGeometry
+    val newSize = sanitizeWindowSize(Size2D(w, h))
+
+    Rect2D(
+      x max 0,
+      y max 0,
+      newSize.width,
+      newSize.height
+    )
+  }
+
+  private def fixInsaneInitialWindowGeometry(): Unit = {
+    // what I mean by insane: ocelot.desktop.ui.UiHandler$ - Created window: 0×0 (at 960, -569)
+
+    val currentGeometry = windowGeometry
+    val geometry = sanitizeWindowGeometry(currentGeometry)
+
+    if (geometry != currentGeometry) {
+      logger.warn(s"Window geometry sanity check failed: ${formatRect(currentGeometry)} is officially insane")
+      logger.warn(s"Resetting to ${formatRect(geometry)}")
+      Display.setDisplayMode(new DisplayMode(geometry.w.toInt, geometry.h.toInt))
+      Display.setLocation(geometry.x.toInt, geometry.y.toInt)
+    }
+  }
+
   def init(root: RootWidget): Unit = {
     this.root = root
     root.relayout()
 
-    loadLibraries()
-
-    isFullScreen = Settings.get.windowFullscreen
+    scalingFactor = Settings.get.scaleFactor
+    fullScreen = Settings.get.windowFullscreen
     windowTitle = "Ocelot Desktop v" + BuildInfo.version
 
     loadIcons()
-    Display.setVSyncEnabled(true)
+
+    if (!Settings.get.disableVsync) {
+      logger.info("VSync enabled")
+      Display.setVSyncEnabled(true)
+    } else {
+      logger.info("VSync disabled (via config)")
+    }
+
     Display.create()
+
+    if (Settings.get.windowValidatePosition) {
+      fixInsaneInitialWindowGeometry()
+    }
+
     KeyEvents.init()
     MouseEvents.init()
 
-    logger.info(s"Created window with ${root.size}")
+    logger.info(s"Created window: ${formatRect(windowGeometry)}")
     logger.info(s"OpenGL vendor: ${GL11.glGetString(GL11.GL_VENDOR)}")
     logger.info(s"OpenGL renderer: ${GL11.glGetString(GL11.GL_RENDERER)}")
+    logger.info(s"OpenGL version: ${GL11.glGetString(GL11.GL_VERSION)}")
 
     Spritesheet.load()
-    graphics = new Graphics
+    graphics = new Graphics(scalingFactor)
 
-    Audio.init()
+    if (Settings.get.audioDisable) {
+      logger.warn("Sound disabled (via config)")
+    } else {
+      Audio.init()
+    }
   }
 
   private var nativeLibrariesDir: String = _
 
-  private def loadLibraries(): Unit = {
+  def loadLibraries(): Unit = {
     // we cannot remove DLL files on Windows after they were loaded by Ocelot
     // therefore we will create them in local directory and keep for future
-    nativeLibrariesDir = if (SystemUtils.IS_OS_WINDOWS)
-      Paths.get(this.getClass.getProtectionDomain.getCodeSource.getLocation.toURI.resolve( "natives")).toString
-      else Files.createTempDirectory("ocelot-desktop").toString
+    nativeLibrariesDir = if (SystemUtils.IS_OS_WINDOWS) {
+      Paths.get(this.getClass.getProtectionDomain.getCodeSource.getLocation.toURI.resolve("natives")).toString
+    } else {
+      val directory = Files.createTempDirectory("ocelot-desktop")
+      Runtime.getRuntime.addShutdownHook(new Thread(() => FileUtils.deleteDirectory(new File(nativeLibrariesDir))))
+
+      directory.toString
+    }
 
     val arch = System.getProperty("os.arch")
     val is64bit = arch.startsWith("amd64")
@@ -202,6 +270,11 @@ object UiHandler extends Logging {
     }
 
     System.setProperty("org.lwjgl.librarypath", nativeLibrariesDir)
+
+    if (Settings.get.debugLwjgl) {
+      logger.info("Enabling LWJGL debug mode")
+      System.setProperty("org.lwjgl.util.Debug", true.toString)
+    }
   }
 
   private def loadIcons(): Unit = {
@@ -257,20 +330,21 @@ object UiHandler extends Logging {
         KeyEvents.update()
         MouseEvents.update()
 
-        Profiler.startTimeMeasurement("000_update")
-        update()
-        Profiler.endTimeMeasurement("000_update")
+        Profiler.measure("000_update") {
+          update()
+        }
 
-        Profiler.startTimeMeasurement("001_draw")
-        draw()
-        Profiler.endTimeMeasurement("001_draw")
+        Profiler.measure("001_draw") {
+          draw()
+        }
+      }
+
+      Profiler.measure("002_sleep") {
+        ticker.waitNext()
       }
 
-      Profiler.startTimeMeasurement("002_sleep")
-      ticker.waitNext()
       Display.update()
       fpsCalculator.tick()
-      Profiler.endTimeMeasurement("002_sleep")
     }
   }
 
@@ -278,11 +352,10 @@ object UiHandler extends Logging {
     root.workspaceView.dispose()
     KeyEvents.destroy()
     MouseEvents.destroy()
+    graphics.freeResource()
+    SoundBuffers.freeResource()
     Display.destroy()
     Audio.destroy()
-
-    if (!SystemUtils.IS_OS_WINDOWS)
-      FileUtils.deleteDirectory(new File(nativeLibrariesDir))
   }
 
   private def update(): Unit = {
@@ -332,11 +405,15 @@ object UiHandler extends Logging {
     val width = Display.getWidth
     val height = Display.getHeight
 
-    graphics.resize(width, height)
-    root.size = Size2D(width, height)
+    if (graphics.resize(width, height, scalingFactor)) {
+      // Checking for window position changes here seems to fail (on linux at least)
+      // It instead happens on the previous frame
+
+      root.size = Size2D(width, height) / scalingFactor
+    }
 
     // Settings fields should be updated only in non-fullscreen mode
-    if (isFullScreen)
+    if (fullScreen)
       return
 
     Settings.get.windowSize.set(width, height)
@@ -344,7 +421,7 @@ object UiHandler extends Logging {
   }
 
   private def draw(): Unit = {
-    graphics.setViewport(root.width.asInstanceOf[Int], root.height.asInstanceOf[Int])
+    graphics.startViewport()
     graphics.clear()
 
     root.draw(graphics)

src/main/scala/ocelot/desktop/ui/widget/Button.scala

@@ -11,26 +11,40 @@ import ocelot.desktop.util.DrawUtils
 
 class Button extends Widget with ClickHandler with ClickSoundSource {
   def text: String = ""
+
   def onClick(): Unit = {}
 
+  def enabled: Boolean = true
+
   override def receiveMouseEvents: Boolean = true
 
   eventHandlers += {
-    case ClickEvent(MouseEvent.Button.Left, _) =>
+    case ClickEvent(MouseEvent.Button.Left, _) if enabled =>
       onClick()
 
       clickSoundSource.play()
   }
 
   override def minimumSize: Size2D = Size2D(24 + text.length * 8, 24)
+
   override def maximumSize: Size2D = minimumSize
 
   override def draw(g: Graphics): Unit = {
-    g.rect(bounds, ColorScheme("ButtonBackground"))
-    DrawUtils.ring(g, position.x, position.y, width, height, 2, ColorScheme("ButtonBorder"))
+    val (background, border, foreground) = if (enabled) (
+      ColorScheme("ButtonBackground"),
+      ColorScheme("ButtonBorder"),
+      ColorScheme("ButtonForeground")
+    ) else (
+      ColorScheme("ButtonBackgroundDisabled"),
+      ColorScheme("ButtonBorderDisabled"),
+      ColorScheme("ButtonForegroundDisabled")
+    )
+
+    g.rect(bounds, background)
+    DrawUtils.ring(g, position.x, position.y, width, height, 2, border)
 
     g.background = Color.Transparent
-    g.foreground = ColorScheme("ButtonForeground")
+    g.foreground = foreground
     val textWidth = text.iterator.map(g.font.charWidth(_)).sum
     g.text(position.x + ((width - textWidth) / 2).round, position.y + 4, text)
   }

src/main/scala/ocelot/desktop/ui/widget/ChangeSimulationSpeedDialog.scala

@@ -91,10 +91,10 @@ class ChangeSimulationSpeedDialog() extends ModalDialog {
         override def onClick(): Unit = close()
       }, Padding2D(right = 8))
 
-      // TODO: disable the button if tickInterval.isEmpty
       children :+= new Button {
         override def text: String = "Apply"
         override def onClick(): Unit = confirm()
+        override def enabled: Boolean = tickInterval.nonEmpty
       }
     }
   }, Padding2D.equal(16))

src/main/scala/ocelot/desktop/ui/widget/CloseConfirmationDialog.scala

@@ -6,12 +6,14 @@ import ocelot.desktop.ui.layout.LinearLayout
 import ocelot.desktop.ui.widget.modal.ModalDialog
 import ocelot.desktop.util.Orientation
 
-class ExitConfirmationDialog extends ModalDialog {
+class CloseConfirmationDialog extends ModalDialog {
+  protected def prompt: String = "Save workspace before exiting?"
+
   children :+= new PaddingBox(new Widget {
     override val layout = new LinearLayout(this, orientation = Orientation.Vertical)
 
     children :+= new PaddingBox(new Label {
-      override def text = "Save workspace before exiting?"
+      override def text: String = prompt
     }, Padding2D(bottom = 16))
 
     children :+= new Widget {
@@ -25,7 +27,7 @@ class ExitConfirmationDialog extends ModalDialog {
 
       children :+= new PaddingBox(new Button {
         override def text: String = "No"
-        override def onClick(): Unit = onExitSelected()
+        override def onClick(): Unit = onNoSaveSelected()
       }, Padding2D(right = 8))
 
       children :+= new PaddingBox(new Button {
@@ -37,5 +39,5 @@ class ExitConfirmationDialog extends ModalDialog {
 
   def onSaveSelected(): Unit = {}
 
-  def onExitSelected(): Unit = {}
+  def onNoSaveSelected(): Unit = {}
 }

src/main/scala/ocelot/desktop/ui/widget/IconButton.scala

@@ -7,6 +7,7 @@ import ocelot.desktop.geometry.Size2D
 import ocelot.desktop.graphics.Graphics
 import ocelot.desktop.ui.event.handlers.{ClickHandler, HoverHandler}
 import ocelot.desktop.ui.event.{ClickEvent, HoverEvent, MouseEvent}
+import ocelot.desktop.ui.widget.tooltip.LabelTooltip
 import ocelot.desktop.util.animation.{ColorAnimation, ValueAnimation}
 import ocelot.desktop.util.{DrawUtils, Spritesheet}
 

src/main/scala/ocelot/desktop/ui/widget/Knob.scala

@@ -7,7 +7,7 @@ import ocelot.desktop.ui.UiHandler
 import ocelot.desktop.ui.event.MouseEvent
 import totoro.ocelot.brain.util.DyeColor
 
-abstract class Knob(dyeColor: DyeColor = DyeColor.RED) extends Widget {
+abstract class Knob(dyeColor: DyeColor = DyeColor.Red) extends Widget {
   def input: Int
   def input_=(v: Int): Unit
 

src/main/scala/ocelot/desktop/ui/widget/LabelTooltip.scala

@@ -1,28 +0,0 @@
-package ocelot.desktop.ui.widget
-
-import ocelot.desktop.color.Color
-import ocelot.desktop.geometry.Padding2D
-import ocelot.desktop.ui.layout.LinearLayout
-import ocelot.desktop.ui.widget.tooltip.Tooltip
-import ocelot.desktop.util.Orientation
-
-class LabelTooltip(text: String) extends Tooltip {
-  override val DelayTime: Float = 1.0f
-
-  private val inner: Widget = new Widget {
-    override val layout = new LinearLayout(this, orientation = Orientation.Vertical)
-  }
-
-  for (line <- text.split("\n")) {
-    inner.children :+= new Label {
-      override def text: String = line
-      override def color: Color = Color.White
-    }
-  }
-
-  children :+= new PaddingBox(inner, Padding2D.equal(4))
-
-  def onSaveSelected(): Unit = {}
-
-  def onExitSelected(): Unit = {}
-}

src/main/scala/ocelot/desktop/ui/widget/MenuBar.scala

@@ -3,8 +3,10 @@ package ocelot.desktop.ui.widget
 import ocelot.desktop.audio.SoundSources
 import ocelot.desktop.geometry.{Padding2D, Size2D}
 import ocelot.desktop.graphics.Graphics
+import ocelot.desktop.ui.event.KeyEvent
 import ocelot.desktop.ui.widget.contextmenu.{ContextMenuEntry, ContextMenuSubmenu}
 import ocelot.desktop.{ColorScheme, OcelotDesktop}
+import org.lwjgl.input.Keyboard
 
 class MenuBar extends Widget {
   override def receiveMouseEvents: Boolean = true
@@ -16,37 +18,40 @@ class MenuBar extends Widget {
   private def addEntry(w: Widget): Unit = entries.children :+= w
 
   addEntry(new MenuBarSubmenu("File", menu => {
-    menu.addEntry(new ContextMenuEntry("New", () => OcelotDesktop.newWorkspace()))
-    menu.addEntry(new ContextMenuEntry("Open", () => OcelotDesktop.open()))
-    menu.addEntry(new ContextMenuEntry("Save", () => OcelotDesktop.save()))
-    menu.addEntry(new ContextMenuEntry("Save as…", () => OcelotDesktop.saveAs()))
+    menu.addEntry(ContextMenuEntry("New") { OcelotDesktop.newWorkspace() })
+    menu.addEntry(ContextMenuEntry("Open") { OcelotDesktop.showOpenDialog() })
+    menu.addEntry(ContextMenuEntry("Save") { OcelotDesktop.save() })
+    menu.addEntry(ContextMenuEntry("Save as…") { OcelotDesktop.saveAs() })
     menu.addSeparator()
-    menu.addEntry(new ContextMenuEntry("Exit", () => OcelotDesktop.exit()))
+    menu.addEntry(ContextMenuEntry("Exit") { OcelotDesktop.exit() })
   }))
 
   addEntry(new MenuBarSubmenu("Player", menu => {
-    menu.addEntry(new ContextMenuEntry("Add...", () => OcelotDesktop.addPlayerDialog()))
+    menu.addEntry(ContextMenuEntry("Add...") { OcelotDesktop.showAddPlayerDialog() })
     menu.addSeparator()
     OcelotDesktop.players.foreach(player => {
       menu.addEntry(new ContextMenuSubmenu(
           (if (player == OcelotDesktop.players.head) "● " else "  ") + player.nickname,
           () => OcelotDesktop.selectPlayer(player.nickname)
       ) {
-        addEntry(new ContextMenuEntry(
-          "Remove",
-          () => OcelotDesktop.removePlayer(player.nickname),
-          sound = SoundSources.InterfaceClickLow
-        ))
+        addEntry(ContextMenuEntry("Remove", sound = SoundSources.InterfaceClickLow) {
+          OcelotDesktop.removePlayer(player.nickname)
+        })
       })
     })
   }))
 
-  addEntry(new MenuBarButton("Settings", () => OcelotDesktop.settings()))
+  addEntry(new MenuBarButton("Settings", () => OcelotDesktop.showSettings()))
 
   addEntry(new Widget {
     override def maximumSize: Size2D = Size2D(Float.PositiveInfinity, 1)
   }) // fill remaining space
 
+  eventHandlers += {
+    case KeyEvent(KeyEvent.State.Press, Keyboard.KEY_F5, _) => OcelotDesktop.save()
+    case KeyEvent(KeyEvent.State.Press, Keyboard.KEY_F9, _) => OcelotDesktop.showOpenDialog()
+  }
+
   override def draw(g: Graphics): Unit = {
     g.rect(bounds, ColorScheme("TitleBarBackground"))
     drawChildren(g)

src/main/scala/ocelot/desktop/ui/widget/Oscilloscope.scala

@@ -7,6 +7,7 @@ import ocelot.desktop.ui.widget.contextmenu.{ContextMenu, ContextMenuEntry, Cont
 import org.jtransforms.fft.FloatFFT_1D
 import totoro.ocelot.brain.Settings
 
+import scala.collection.immutable.ArraySeq
 import scala.collection.mutable
 
 class Oscilloscope(isTiny: Boolean = false) extends Widget with ClickHandler {
@@ -101,7 +102,7 @@ class Oscilloscope(isTiny: Boolean = false) extends Widget with ClickHandler {
 
   private def updateMode(f: Int => Int): Unit = {
     modeIdx = f(modeIdx)
-    children = Array(modes(modeIdx)())
+    children = ArraySeq(modes(modeIdx)())
   }
 
   override def minimumSize: Size2D = if (isTiny) Size2D(100, 68) else Size2D(500, 120)
@@ -110,7 +111,7 @@ class Oscilloscope(isTiny: Boolean = false) extends Widget with ClickHandler {
     menu.addEntry(new ContextMenuSubmenu("FFT Size") {
       for (v <- List(512, 1024, 2048, 4096, 8192, 16384, 32768)) {
         val dot = if (v == fftSize) '•' else ' '
-        addEntry(new ContextMenuEntry(s"$v".padTo(14, ' ') + dot, () => setFFTSize(v)))
+        addEntry(ContextMenuEntry(s"$v".padTo(14, ' ') + dot) { setFFTSize(v) })
       }
     })
   }
@@ -120,7 +121,7 @@ class Oscilloscope(isTiny: Boolean = false) extends Widget with ClickHandler {
       for (v <- List(None, Some(0.1f), Some(0.3f), Some(0.5f), Some(0.7f), Some(0.9f))) {
         val dot = if (v == smoothing) '•' else ' '
         val msg = if (v.isEmpty) "None" else s"${v.get}"
-        addEntry(new ContextMenuEntry(msg.padTo(14, ' ') + dot, () => smoothing = v))
+        addEntry(ContextMenuEntry(msg.padTo(14, ' ') + dot) { smoothing = v })
       }
     })
   }

src/main/scala/ocelot/desktop/ui/widget/PaddingBox.scala

@@ -3,8 +3,10 @@ package ocelot.desktop.ui.widget
 import ocelot.desktop.geometry.Padding2D
 import ocelot.desktop.ui.layout.PaddingLayout
 
+import scala.collection.immutable.ArraySeq
+
 class PaddingBox(inner: Widget, padding: Padding2D) extends Widget {
   override protected val layout = new PaddingLayout(this, padding)
 
-  children = Array(inner)
+  children = ArraySeq(inner)
 }

src/main/scala/ocelot/desktop/ui/widget/RootWidget.scala

@@ -60,7 +60,7 @@ class RootWidget(setupDefaultWorkspace: Boolean = true) extends Widget {
       }
 
     case KeyEvent(KeyEvent.State.Release, Keyboard.KEY_F11, _) =>
-      UiHandler.isFullScreen = !UiHandler.isFullScreen
+      UiHandler.fullScreen = !UiHandler.fullScreen
   }
 
   override def draw(g: Graphics): Unit = {

src/main/scala/ocelot/desktop/ui/widget/Slider.scala

@@ -10,8 +10,9 @@ import ocelot.desktop.ui.event.{ClickEvent, DragEvent, MouseEvent}
 import ocelot.desktop.util.DrawUtils
 import ocelot.desktop.util.MathUtils.ExtendedFloat
 
-class Slider(var value: Float, text: String) extends Widget with ClickHandler with DragHandler with ClickSoundSource {
+class Slider(var value: Float, val text: String, val snapPoints: Int = 0) extends Widget with ClickHandler with DragHandler with ClickSoundSource {
   def onValueChanged(value: Float): Unit = {}
+  def onValueFinal(value: Float): Unit = {}
 
   override def receiveMouseEvents: Boolean = true
 
@@ -24,10 +25,26 @@ class Slider(var value: Float, text: String) extends Widget with ClickHandler wi
     onValueChanged(value)
   }
 
+
   eventHandlers += {
     case ClickEvent(MouseEvent.Button.Left, pos) =>
       calculateValue(pos.x)
       clickSoundSource.play()
+      if (snapPoints > 1) {
+        value = (value * (snapPoints - 1)).round / (snapPoints - 1).toFloat
+      }
+      onValueFinal(value)
+
+    case DragEvent(DragEvent.State.Stop, MouseEvent.Button.Left, pos) =>
+      calculateValue(pos.x)
+      if (lastSoundX == 0 || (pos.x - lastSoundX).abs > soundInterval) {
+        lastSoundX = pos.x
+        clickSoundSource.play()
+      }
+      if (snapPoints > 1) {
+        value = (value * (snapPoints - 1)).round / (snapPoints - 1).toFloat
+      }
+      onValueFinal(value)
 
     case DragEvent(_, MouseEvent.Button.Left, pos) =>
       calculateValue(pos.x)
@@ -40,18 +57,23 @@ class Slider(var value: Float, text: String) extends Widget with ClickHandler wi
   override def minimumSize: Size2D = Size2D(24 + text.length * 8, 24)
   override def maximumSize: Size2D = minimumSize.copy(width = Float.PositiveInfinity)
 
+  def formatText: String = f"$text: ${value * 100}%.0f%%"
+
   override def draw(g: Graphics): Unit = {
     g.rect(bounds, ColorScheme("SliderBackground"))
     DrawUtils.ring(g, position.x, position.y, width, height, 2, ColorScheme("SliderBorder"))
 
+    for (i <- 1 until snapPoints - 1) {
+      g.rect(position.x + (i / (snapPoints.toFloat - 1)) * (bounds.w - handleWidth / 2), position.y + 6, handleWidth / 2, height - 12, ColorScheme("SliderTick"))
+    }
+
     g.rect(position.x + value * (bounds.w - handleWidth), position.y, handleWidth, height, ColorScheme("SliderHandler"))
     DrawUtils.ring(g, position.x + value * (bounds.w - handleWidth), position.y, handleWidth, height, 2, ColorScheme("SliderBorder"))
 
     g.background = Color.Transparent
     g.foreground = ColorScheme("SliderForeground")
-    val fullText = f"$text: ${value * 100}%.0f%%"
-    val textWidth = fullText.iterator.map(g.font.charWidth(_)).sum
-    g.text(position.x + ((width - textWidth) / 2).round, position.y + 4, fullText)
+    val textWidth = formatText.iterator.map(g.font.charWidth(_)).sum
+    g.text(position.x + ((width - textWidth) / 2).round, position.y + 4, formatText)
   }
 
   override protected def clickSoundSource: SoundSource = SoundSources.InterfaceTick

src/main/scala/ocelot/desktop/ui/widget/Widget.scala

@@ -6,10 +6,12 @@ import ocelot.desktop.ui.UiHandler
 import ocelot.desktop.ui.event.Event
 import ocelot.desktop.ui.layout.{Layout, LinearLayout}
 
+import scala.collection.immutable.ArraySeq
+
 class Widget {
   protected val layout: Layout = new LinearLayout(this)
 
-  protected var _children: Array[Widget] = Array[Widget]()
+  protected var _children: ArraySeq[Widget] = ArraySeq.empty
   protected var _parent: Option[Widget] = None
   protected var _root: Option[RootWidget] = None
 
@@ -33,10 +35,10 @@ class Widget {
     UiHandler.updateHierarchy()
   }
 
-  final def children: Array[Widget] = _children
+  final def children: ArraySeq[Widget] = _children
 
-  final def children_=(value: Array[Widget]): Unit = {
-    if (_children sameElements value) return
+  final def children_=(value: ArraySeq[Widget]): Unit = {
+    if (_children == value) return
     _children = value
 
     for (child <- _children) {
@@ -114,7 +116,7 @@ class Widget {
     Rect2D(position, size).intersect(parentBounds)
   }
 
-  def hierarchy: Array[Widget] = children
+  def hierarchy: ArraySeq[Widget] = children
 
   def shouldClip: Boolean = false
 

src/main/scala/ocelot/desktop/ui/widget/WorkspaceView.scala

@@ -15,11 +15,12 @@ import ocelot.desktop.{ColorScheme, OcelotDesktop, Settings}
 import org.lwjgl.input.Keyboard
 import totoro.ocelot.brain.entity.traits.{Entity, Environment, SidedEnvironment}
 import totoro.ocelot.brain.entity.{Case, Screen}
-import totoro.ocelot.brain.event.{EventBus, NodeEvent}
+import totoro.ocelot.brain.event.{EventBus, InventoryEntityAddedEvent, InventoryEvent, NodeEvent}
 import totoro.ocelot.brain.nbt.ExtendedNBT._
 import totoro.ocelot.brain.nbt.{NBT, NBTBase, NBTTagCompound}
 import totoro.ocelot.brain.util.{Direction, Tier}
 
+import scala.collection.immutable.ArraySeq
 import scala.collection.{immutable, mutable}
 import scala.jdk.CollectionConverters._
 
@@ -40,13 +41,17 @@ class WorkspaceView extends Widget with DragHandler with ClickHandler with Hover
   override protected val layout: Layout = new CopyLayout(this)
   children +:= windowPool
   children +:= new NoLayoutBox {
-    override def hierarchy: Array[Widget] = nodes.toArray
+    override def hierarchy: ArraySeq[Widget] = ArraySeq.from(nodes)
   }
 
-  private val eventSubscription = EventBus.subscribe { case event: NodeEvent =>
-    nodes
-      .filter(_.shouldReceiveEventsFor(event.address))
-      .foreach(_.handleEvent(BrainEvent(event)))
+  private val eventSubscription = EventBus.subscribe {
+    case event: NodeEvent =>
+      nodes
+        .filter(_.shouldReceiveEventsFor(event.address))
+        .foreach(_.handleEvent(BrainEvent(event)))
+
+    case event: InventoryEvent =>
+      nodes.foreach(_.handleEvent(BrainEvent(event)))
   }
 
   def reset(): Unit = {
@@ -73,7 +78,9 @@ class WorkspaceView extends Widget with DragHandler with ClickHandler with Hover
 
       val address = nbt.getString("address")
       var entity = OcelotDesktop.workspace.entityByAddress(address).orNull
+
       if (entity == null) {
+        // FIXME: 1. won't work for many components 2. should not be done this way at all 3. needs logging
         val entityClass = Class.forName(nbt.getString("entityClass"))
         entity = entityClass.getConstructor().newInstance().asInstanceOf[Entity]
       }
@@ -177,7 +184,7 @@ class WorkspaceView extends Widget with DragHandler with ClickHandler with Hover
   def createDefaultWorkspace(): Unit = {
     addNode(new ComputerNode(new Case(Tier.Three)).setup(), Vector2D(68, 68))
     addNode(new ScreenNode(new Screen(Tier.Two)).setup(), Vector2D(204, 136))
-    nodes(0).connect(NodePort(), nodes(1), NodePort())
+    nodes.head.connect(NodePort(), nodes(1), NodePort())
   }
 
   override def receiveMouseEvents = true
@@ -449,11 +456,11 @@ class WorkspaceView extends Widget with DragHandler with ClickHandler with Hover
     val numRepeatsX = math.ceil((size.width + backgroundOffsetX) / 304f).asInstanceOf[Int]
     val numRepeatsY = math.ceil((size.height + backgroundOffsetY) / 304f).asInstanceOf[Int]
 
-    g.translate(-backgroundOffsetX, -backgroundOffsetY)
+    g.translate(-backgroundOffsetX.toFloat, -backgroundOffsetY.toFloat)
 
     for (x <- 0 to numRepeatsX) {
       for (y <- 0 to numRepeatsY) {
-        g.sprite("BackgroundPattern", x * 304, y * 304, 304, 304)
+        g.sprite("BackgroundPattern", x.toFloat * 304, y.toFloat * 304, 304, 304)
       }
     }
 

src/main/scala/ocelot/desktop/ui/widget/card/Redstone1Window.scala

@@ -7,22 +7,22 @@ import ocelot.desktop.ui.widget.window.BasicWindow
 import ocelot.desktop.ui.widget.{Knob, Label, PaddingBox, Widget}
 import ocelot.desktop.util.{DrawUtils, Orientation}
 import totoro.ocelot.brain.entity.Redstone
-import totoro.ocelot.brain.util.DyeColor
+import totoro.ocelot.brain.util.{Direction, DyeColor}
 
 class Redstone1Window(card: Redstone.Tier1) extends BasicWindow {
-  private def redstoneKnob(side: Int) = new Knob(DyeColor.RED) {
+  private def redstoneKnob(side: Direction.Value) = new Knob(DyeColor.Red) {
     override def input: Int = {
-      card.redstoneInput(side) min 15 max 0
+      card.redstoneInput(side.id) min 15 max 0
     }
 
     override def input_=(v: Int): Unit = {
-      card.redstoneInput(side) = v
+      card.setRedstoneInput(side, v)
     }
 
-    override def output: Int = card.redstoneOutput(side) min 15 max 0
+    override def output: Int = card.redstoneOutput(side.id) min 15 max 0
   }
 
-  private def redstoneBlock(side: Int, name: String) = new PaddingBox(new Widget {
+  private def redstoneBlock(side: Direction.Value, name: String) = new PaddingBox(new Widget {
     override protected val layout: Layout = new LinearLayout(this, Orientation.Horizontal, contentAlignment = Alignment.Center)
 
     children :+= new PaddingBox(new Label {
@@ -44,18 +44,18 @@ class Redstone1Window(card: Redstone.Tier1) extends BasicWindow {
     children :+= new Widget {
       children :+= new Widget {
         override protected val layout: Layout = new LinearLayout(this, orientation = Orientation.Vertical)
-        children :+= redstoneBlock(0, "Bottom")
-        children :+= redstoneBlock(1, "   Top")
+        children :+= redstoneBlock(Direction.Down, "Bottom")
+        children :+= redstoneBlock(Direction.Up, "   Top")
       }
       children :+= new Widget {
         override protected val layout: Layout = new LinearLayout(this, orientation = Orientation.Vertical)
-        children :+= redstoneBlock(2, " Back")
-        children :+= redstoneBlock(3, "Front")
+        children :+= redstoneBlock(Direction.Back, " Back")
+        children :+= redstoneBlock(Direction.Front, "Front")
       }
       children :+= new Widget {
         override protected val layout: Layout = new LinearLayout(this, orientation = Orientation.Vertical)
-        children :+= redstoneBlock(4, "Right")
-        children :+= redstoneBlock(5, " Left")
+        children :+= redstoneBlock(Direction.Right, "Right")
+        children :+= redstoneBlock(Direction.Left, " Left")
       }
     }
   }, Padding2D.equal(8))

src/main/scala/ocelot/desktop/ui/widget/card/Redstone2Window.scala

@@ -7,22 +7,22 @@ import ocelot.desktop.ui.widget.window.BasicWindow
 import ocelot.desktop.ui.widget.{Knob, Label, PaddingBox, Widget}
 import ocelot.desktop.util.{DrawUtils, Orientation}
 import totoro.ocelot.brain.entity.Redstone
-import totoro.ocelot.brain.util.DyeColor
+import totoro.ocelot.brain.util.{Direction, DyeColor}
 
 class Redstone2Window(card: Redstone.Tier2) extends BasicWindow {
-  private def bundledKnob(side: Int, col: Int) = new Knob(DyeColor.byCode(col)) {
+  private def bundledKnob(side: Direction.Value, col: Int) = new Knob(DyeColor.byCode(col)) {
     override def input: Int = {
-      card.bundledRedstoneInput(side)(col) min 15 max 0
+      card.bundledRedstoneInput(side.id)(col) min 15 max 0
     }
 
     override def input_=(v: Int): Unit = {
-      card.bundledRedstoneInput(side)(col) = v
+      card.setBundledInput(side, col, v)
     }
 
-    override def output: Int = card.bundledRedstoneOutput(side)(col) min 15 max 0
+    override def output: Int = card.bundledRedstoneOutput(side.id)(col) min 15 max 0
   }
 
-  private def bundledBlock(side: Int, name: String) = new PaddingBox(new Widget {
+  private def bundledBlock(side: Direction.Value, name: String) = new PaddingBox(new Widget {
     override protected val layout: Layout = new LinearLayout(this) {
       orientation = Orientation.Vertical
       contentAlignment = Alignment.Center
@@ -69,18 +69,18 @@ class Redstone2Window(card: Redstone.Tier2) extends BasicWindow {
     children :+= new Widget {
       children :+= new Widget {
         override protected val layout: Layout = new LinearLayout(this, orientation = Orientation.Vertical)
-        children :+= bundledBlock(0, "Bottom")
-        children :+= bundledBlock(1, "Top")
+        children :+= bundledBlock(Direction.Down, "Bottom")
+        children :+= bundledBlock(Direction.Up, "Top")
       }
       children :+= new Widget {
         override protected val layout: Layout = new LinearLayout(this, orientation = Orientation.Vertical)
-        children :+= bundledBlock(2, "Back")
-        children :+= bundledBlock(3, "Front")
+        children :+= bundledBlock(Direction.Back, "Back")
+        children :+= bundledBlock(Direction.Front, "Front")
       }
       children :+= new Widget {
         override protected val layout: Layout = new LinearLayout(this, orientation = Orientation.Vertical)
-        children :+= bundledBlock(4, "Right")
-        children :+= bundledBlock(5, "Left")
+        children :+= bundledBlock(Direction.Right, "Right")
+        children :+= bundledBlock(Direction.Left, "Left")
       }
     }
   }, Padding2D.equal(8))

src/main/scala/ocelot/desktop/ui/widget/component/ComponentSelectors.scala

@@ -7,10 +7,12 @@ import ocelot.desktop.ui.layout.Layout
 import ocelot.desktop.ui.widget.Widget
 import org.lwjgl.input.Keyboard
 
+import scala.collection.immutable.ArraySeq
+
 class ComponentSelectors extends Widget {
   override protected val layout: Layout = new Layout(this)
 
-  private def selectors: Array[ComponentSelector] = children.map(_.asInstanceOf[ComponentSelector])
+  private def selectors: ArraySeq[ComponentSelector] = children.map(_.asInstanceOf[ComponentSelector])
 
   override def receiveAllMouseEvents: Boolean = true
 

src/main/scala/ocelot/desktop/ui/widget/contextmenu/ContextMenu.scala

@@ -9,6 +9,8 @@ import ocelot.desktop.util.animation.ValueAnimation
 import ocelot.desktop.util.animation.easing.EaseInOutQuad
 import ocelot.desktop.util.{DrawUtils, Orientation}
 
+import scala.collection.immutable.ArraySeq
+
 class ContextMenu extends Widget {
   private[contextmenu] var isClosing = false
   private[contextmenu] var isOpening = false
@@ -38,7 +40,7 @@ class ContextMenu extends Widget {
     inner.children :+= new Separator
   }
 
-  private[contextmenu] def entries: Array[ContextMenuEntry] = inner.children
+  private[contextmenu] def entries: ArraySeq[ContextMenuEntry] = inner.children
     .filter(_.isInstanceOf[ContextMenuEntry])
     .map(_.asInstanceOf[ContextMenuEntry])
 

src/main/scala/ocelot/desktop/ui/widget/contextmenu/ContextMenuEntry.scala

@@ -12,13 +12,17 @@ import ocelot.desktop.ui.widget._
 import ocelot.desktop.util.animation.ValueAnimation
 import ocelot.desktop.util.animation.easing.{EaseInQuad, EaseOutQuad}
 
-class ContextMenuEntry(label: String,
-                       onClick: () => Unit = () => {},
-                       icon: Option[IconDef] = None,
-                       sound: SoundSource = SoundSources.InterfaceClick,
-                       soundDisabled: SoundSource = SoundSources.InterfaceClickLow)
-  extends Widget with ClickHandler with HoverHandler with ClickSoundSource
-{
+class ContextMenuEntry(
+  label: String,
+  onClick: () => Unit = () => {},
+  icon: Option[IconDef] = None,
+  sound: SoundSource = SoundSources.InterfaceClick,
+  soundDisabled: SoundSource = SoundSources.InterfaceClickLow
+) extends Widget
+  with ClickHandler
+  with HoverHandler
+  with ClickSoundSource {
+
   private[contextmenu] val alpha = new ValueAnimation(0f, 10f)
   private[contextmenu] val textAlpha = new ValueAnimation(0f, 5f)
   private[contextmenu] val trans = new ValueAnimation(0f, 20f)
@@ -32,22 +36,27 @@ class ContextMenuEntry(label: String,
     case _ => 12f
   }
 
-  children :+= new PaddingBox(new Widget {
-    override val layout: Layout = new LinearLayout(this) {
-      contentAlignment = Alignment.Center
-    }
+  children :+= new PaddingBox(
+    new Widget {
+      override val layout: Layout = new LinearLayout(this) {
+        contentAlignment = Alignment.Center
+      }
 
-    icon match {
-      case Some(icon) =>
-        children :+= new PaddingBox(new Icon(icon), Padding2D(left = 8f, right = 6f))
-      case _ =>
-    }
+      icon match {
+        case Some(icon) =>
+          children :+= new PaddingBox(new Icon(icon), Padding2D(left = 8f, right = 6f))
+        case _ =>
+      }
 
-    children :+= new PaddingBox(new Label {
-      override def text: String = label
-      override def color: Color = ColorScheme("ContextMenuText")
-    }, Padding2D(top = 3f, bottom = 3f))
-  }, Padding2D(left = padLeft, right = 16f, top = 2f, bottom = 2f))
+      children :+= new PaddingBox(
+        new Label {
+          override def text: String = label
+
+          override def color: Color = ColorScheme("ContextMenuText")
+        }, Padding2D(top = 3f, bottom = 3f)
+      )
+    }, Padding2D(left = padLeft, right = 16f, top = 2f, bottom = 2f)
+  )
 
   override def receiveMouseEvents: Boolean = !isGhost
 
@@ -113,3 +122,19 @@ class ContextMenuEntry(label: String,
   override protected def clickSoundSource: SoundSource =
     if (isEnabled) sound else soundDisabled
 }
+
+object ContextMenuEntry {
+  def apply(
+    label: String,
+    icon: Option[IconDef] = None,
+    sound: SoundSource = SoundSources.InterfaceClick,
+    soundDisabled: SoundSource = SoundSources.InterfaceClickLow
+  )(onClick: => Unit): ContextMenuEntry =
+    new ContextMenuEntry(
+      label,
+      onClick = onClick _,
+      icon = icon,
+      sound = sound,
+      soundDisabled = soundDisabled
+    )
+}

src/main/scala/ocelot/desktop/ui/widget/contextmenu/ContextMenus.scala

@@ -8,12 +8,14 @@ import ocelot.desktop.ui.layout.Layout
 import ocelot.desktop.ui.widget.Widget
 import org.lwjgl.input.Keyboard
 
+import scala.collection.immutable.ArraySeq
+
 class ContextMenus extends Widget {
   override protected val layout: Layout = new Layout(this)
 
   private var ghost: Option[ContextMenuEntry] = None
 
-  private def menus: Array[ContextMenu] = children.map(_.asInstanceOf[ContextMenu])
+  private def menus: ArraySeq[ContextMenu] = children.map(_.asInstanceOf[ContextMenu])
 
   private[contextmenu] def setGhost(g: ContextMenuEntry): Unit = {
     ghost = Some(g)

src/main/scala/ocelot/desktop/ui/widget/modal/ModalDialogPool.scala

@@ -9,6 +9,8 @@ import ocelot.desktop.ui.layout.Layout
 import ocelot.desktop.ui.widget.Widget
 import ocelot.desktop.util.animation.UnitAnimation
 
+import scala.collection.immutable.ArraySeq
+
 class ModalDialogPool extends Widget with ClickHandler {
   override protected val layout: Layout = new Layout(this) {
     override def relayout(): Unit = {
@@ -22,7 +24,7 @@ class ModalDialogPool extends Widget with ClickHandler {
 
   private val curtainsAlphaAnimation = UnitAnimation.easeInOutQuad(0.13f)
 
-  private def dialogs: Array[ModalDialog] = children.map(_.asInstanceOf[ModalDialog])
+  private def dialogs: ArraySeq[ModalDialog] = children.map(_.asInstanceOf[ModalDialog])
 
   def isVisible: Boolean = dialogs.nonEmpty
 
@@ -60,7 +62,7 @@ class ModalDialogPool extends Widget with ClickHandler {
       else
         curtainsAlphaAnimation.goUp()
       if (dialogs.head.isClosed)
-        children = Array()
+        children = ArraySeq.empty
     } else if (dialogs.head.isClosed) {
       children = children.take(children.length - 1)
     }

src/main/scala/ocelot/desktop/ui/widget/modal/notification/NotificationDialog.scala

@@ -3,7 +3,7 @@ package ocelot.desktop.ui.widget.modal.notification
 import ocelot.desktop.ColorScheme
 import ocelot.desktop.color.Color
 import ocelot.desktop.geometry.Padding2D
-import ocelot.desktop.graphics.{Graphics, IconDef}
+import ocelot.desktop.graphics.{Graphics, IconDef, Icons}
 import ocelot.desktop.ui.layout.LinearLayout
 import ocelot.desktop.ui.widget._
 import ocelot.desktop.ui.widget.modal.ModalDialog
@@ -32,7 +32,7 @@ class NotificationDialog(message: String, notificationType: NotificationType = N
 
       // Icon
       children :+= new PaddingBox(
-        new Icon(new IconDef(s"icons/Notification${notificationType.toString}", 4)),
+        new Icon(Icons.NotificationIcon(notificationType)),
         Padding2D.equal(10)
       )
 

src/main/scala/ocelot/desktop/ui/widget/settings/SettingsTab.scala

@@ -1,5 +1,6 @@
 package ocelot.desktop.ui.widget.settings
 
+import ocelot.desktop.graphics.IconDef
 import ocelot.desktop.ui.layout.LinearLayout
 import ocelot.desktop.ui.widget.Widget
 import ocelot.desktop.util.Orientation
@@ -7,7 +8,7 @@ import ocelot.desktop.util.Orientation
 trait SettingsTab extends Widget {
   override protected val layout = new LinearLayout(this, orientation = Orientation.Vertical)
 
-  val icon: String
+  val icon: IconDef
   val label: String
 
   /**