Generate and use mipmaps for screen textures

src/main/resources/ocelot/desktop/ocelot.conf

@@ -53,4 +53,9 @@ ocelot {
     # Otherwise, content will be shown only in windows
     renderScreenDataOnNodes: true
   }
+
+  render {
+    # Whether mipmap scaling is enabled for screen windows (when shrinking).
+    screenWindowMipmap: true
+  }
 }

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

@@ -50,6 +50,8 @@ class Settings(val config: Config) extends SettingsData {
   saveOnExit = config.getBooleanOrElse("ocelot.workspace.saveOnExit", default = true)
   openLastWorkspace = config.getBooleanOrElse("ocelot.workspace.openLastWorkspace", default = true)
   renderScreenDataOnNodes = config.getBooleanOrElse("ocelot.workspace.renderScreenDataOnNodes", default = true)
+
+  screenWindowMipmap = config.getBooleanOrElse("ocelot.render.screenWindowMipmap", default = true)
 }
 
 object Settings extends Logging {

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

@@ -3,6 +3,7 @@ package ocelot.desktop.graphics
 import ocelot.desktop.color.{Color, RGBAColorNorm}
 import ocelot.desktop.geometry.{Rect2D, Size2D, Transform2D, Vector2D}
 import ocelot.desktop.graphics.IconSource.Animation
+import ocelot.desktop.graphics.Texture.MinFilteringMode
 import ocelot.desktop.graphics.mesh.{Mesh2D, MeshInstance2D, MeshVertex2D}
 import ocelot.desktop.graphics.render.InstanceRenderer
 import ocelot.desktop.ui.UiHandler
@@ -145,11 +146,19 @@ class Graphics(private var width: Int, private var height: Int, private var scal
     flush(mainTexture = viewport.textureColor)
   }
 
-  def blitScreenViewport(viewport: ScreenViewport, bounds: Rect2D, alpha: Float = 1.0f): Unit = {
+  def blitScreenViewport(
+    viewport: ScreenViewport,
+    bounds: Rect2D,
+    filteringMode: MinFilteringMode = MinFilteringMode.Nearest,
+    alpha: Float = 1.0f
+  ): Unit = {
     flush()
     foreground = RGBAColorNorm(1, 1, 1, alpha)
     spriteRect = Rect2D(0, 1f, 1f, -1f)
     _rect(bounds.x, bounds.y, bounds.w, bounds.h, fixUV = false)
+
+    viewport.texture.setMinFilter(filteringMode)
+
     flush(mainTexture = viewport.texture)
   }
 

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

@@ -27,6 +27,8 @@ class ScreenViewport(graphics: Graphics, private var _width: Int, private var _h
   private var _foreground: RGBAColorNorm = RGBAColorNorm(0f, 0f, 0f)
   private var _background: RGBAColorNorm = RGBAColorNorm(1f, 1f, 1f)
 
+  private var mipmapDirty = false
+
   override def freeResource(): Unit = {
     super.freeResource()
 
@@ -110,6 +112,8 @@ class ScreenViewport(graphics: Graphics, private var _width: Int, private var _h
     Spritesheet.texture.bind()
     _font.texture.bind(1)
     renderer.flush()
+
+    mipmapDirty = true
   }
 
   def renderWith(f: => Unit): Unit = {
@@ -121,4 +125,11 @@ class ScreenViewport(graphics: Graphics, private var _width: Int, private var _h
       flush()
     }
   }
+
+  def generateMipmap(): Unit = {
+    if (mipmapDirty) {
+      texture.generateMipmap()
+      mipmapDirty = false
+    }
+  }
 }

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

@@ -1,5 +1,6 @@
 package ocelot.desktop.graphics
 
+import ocelot.desktop.graphics.Texture.MinFilteringMode
 import ocelot.desktop.util.{Logging, Resource}
 import org.lwjgl.BufferUtils
 import org.lwjgl.opengl._
@@ -7,7 +8,7 @@ import org.lwjgl.opengl._
 import java.awt.image.BufferedImage
 import java.nio.ByteBuffer
 
-class Texture extends Logging with Resource {
+class Texture() extends Logging with Resource {
   val texture: Int = GL11.glGenTextures()
 
   bind()
@@ -70,8 +71,30 @@ class Texture extends Logging with Resource {
     GL11.glBindTexture(GL11.GL_TEXTURE_2D, texture)
   }
 
+  def setMinFilter(filter: MinFilteringMode): Unit = {
+    bind()
+    GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MIN_FILTER, filter.glValue)
+  }
+
+  def generateMipmap(): Unit = {
+    bind()
+    GL30.glGenerateMipmap(GL11.GL_TEXTURE_2D)
+  }
+
   override def freeResource(): Unit = {
     super.freeResource()
     GL11.glDeleteTextures(texture)
   }
 }
+
+object Texture {
+  class MinFilteringMode private(private[Texture] val glValue: Int, val needsMipmap: Boolean)
+
+  object MinFilteringMode {
+    val Nearest = new MinFilteringMode(GL11.GL_NEAREST, false)
+    val NearestMipmapNearest = new MinFilteringMode(GL11.GL_NEAREST_MIPMAP_NEAREST, true)
+    val NearestMipmapLinear = new MinFilteringMode(GL11.GL_NEAREST_MIPMAP_LINEAR, true)
+    val LinearMipmapNearest = new MinFilteringMode(GL11.GL_LINEAR_MIPMAP_NEAREST, true)
+    val LinearMipmapLinear = new MinFilteringMode(GL11.GL_LINEAR_MIPMAP_LINEAR, true)
+  }
+}

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

@@ -2,6 +2,7 @@ package ocelot.desktop.node.nodes
 
 import ocelot.desktop.color.{Color, IntColor}
 import ocelot.desktop.geometry.{Rect2D, Size2D}
+import ocelot.desktop.graphics.Texture.MinFilteringMode
 import ocelot.desktop.graphics.{Graphics, IconSource, ScreenViewport}
 import ocelot.desktop.node.Node.{HighlightThickness, NoHighlightSize, Size}
 import ocelot.desktop.node.nodes.ScreenNode.{FontHeight, FontWidth, Margin}
@@ -116,9 +117,8 @@ class ScreenNode(val screen: Screen)
     super.setupContextMenu(menu, event)
   }
 
-  private def drawScreenTexture(): Unit = {
-    if (bufferRendered) return
-
+  private def drawScreenTexture(needsMipmap: Boolean): Unit = {
+    if (!bufferRendered) {
       viewport.renderWith {
         val width = (screen.getWidth * FontWidth).toInt
         val height = (screen.getHeight * FontHeight).toInt
@@ -139,21 +139,33 @@ class ScreenNode(val screen: Screen)
             }
           }
         }
+      }
 
       bufferRendered = true
     }
+
+    if (needsMipmap) {
+      viewport.generateMipmap()
+    }
   }
 
-  def drawScreenData(g: Graphics, startX: Float, startY: Float, scaleX: Float, scaleY: Float): Unit = {
+  def drawScreenData(
+    g: Graphics,
+    startX: Float,
+    startY: Float,
+    scaleX: Float,
+    scaleY: Float,
+    filteringMode: MinFilteringMode
+  ): Unit = {
     g.save()
     g.scale(scaleX, scaleY)
 
     val startXScaled = startX / scaleX
     val startYScaled = startY / scaleY
 
-    drawScreenTexture()
+    drawScreenTexture(filteringMode.needsMipmap)
     val bounds = Rect2D(startXScaled, startYScaled, viewport.width, viewport.height)
-    g.blitScreenViewport(viewport, bounds)
+    g.blitScreenViewport(viewport, bounds, filteringMode = filteringMode)
 
     g.restore()
   }
@@ -351,7 +363,8 @@ class ScreenNode(val screen: Screen)
           virtualScreenBounds.x + virtualScreenBounds.w / 2 - (pixelDataSize.width * scale) / 2,
           virtualScreenBounds.y + virtualScreenBounds.h / 2 - (pixelDataSize.height * scale) / 2,
           scale,
-          scale
+          scale,
+          MinFilteringMode.NearestMipmapNearest
         )
       }
       // Drawing simple overlay otherwise

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

@@ -68,6 +68,15 @@ class UISettingsTab extends SettingsTab {
     }
   }, Padding2D(bottom = 8))
 
+  children :+= new PaddingBox(new Checkbox("Enable mipmaps for screen windows",
+    initialValue = Settings.get.screenWindowMipmap) {
+    override def minimumSize: Size2D = Size2D(512, 24)
+
+    override def onValueChanged(value: Boolean): Unit = {
+      Settings.get.screenWindowMipmap = value
+    }
+  }, Padding2D(bottom = 8))
+
   children :+= new PaddingBox(new Slider((Settings.get.scaleFactor - 1) / 2, "Interface scale", 5) {
     override def minimumSize: Size2D = Size2D(512, 24)
 

src/main/scala/ocelot/desktop/util/SettingsData.scala

@@ -42,6 +42,8 @@ class SettingsData {
   var openLastWorkspace: Boolean = true
   var renderScreenDataOnNodes: Boolean = true
 
+  var screenWindowMipmap: Boolean = true
+
   private val mirror = universe.runtimeMirror(getClass.getClassLoader).reflect(this)
 
   def updateWith(data: SettingsData): Unit = {

src/main/scala/ocelot/desktop/windows/ScreenWindow.scala

@@ -4,6 +4,7 @@ import ocelot.desktop.audio.SoundSource
 import ocelot.desktop.color.RGBAColor
 import ocelot.desktop.geometry.{Rect2D, Size2D, Vector2D}
 import ocelot.desktop.graphics.Graphics
+import ocelot.desktop.graphics.Texture.MinFilteringMode
 import ocelot.desktop.node.nodes.ScreenNode
 import ocelot.desktop.node.nodes.ScreenNode.{FontHeight, FontWidth}
 import ocelot.desktop.ui.UiHandler
@@ -12,7 +13,7 @@ import ocelot.desktop.ui.event.{DragEvent, KeyEvent, MouseEvent, ScrollEvent}
 import ocelot.desktop.ui.widget.window.BasicWindow
 import ocelot.desktop.util.{DrawUtils, Logging}
 import ocelot.desktop.windows.ScreenWindow._
-import ocelot.desktop.{ColorScheme, OcelotDesktop}
+import ocelot.desktop.{ColorScheme, OcelotDesktop, Settings}
 import org.apache.commons.lang3.StringUtils
 import org.lwjgl.input.Keyboard
 import totoro.ocelot.brain.entity.Screen
@@ -254,7 +255,12 @@ class ScreenWindow(screenNode: ScreenNode) extends BasicWindow with Logging {
         startX,
         startY,
         scaleX,
-        scaleY
+        scaleY,
+        if (Settings.get.screenWindowMipmap) {
+          MinFilteringMode.LinearMipmapLinear
+        } else {
+          MinFilteringMode.Nearest
+        }
       )
 
     }