config: framebuffer scaling

This option allows setting a different resolution for the world or gui framebuffer than the actual screen has. This can improve performance if you don't need as much quality and the whole game is fragment shader bottlenecked

src/integration-test/kotlin/de/bixilon/minosoft/gui/rendering/system/dummy/buffer/DummyFramebuffer.kt

@@ -1,6 +1,6 @@
 /*
  * Minosoft
- * Copyright (C) 2020-2022 Moritz Zwerger
+ * Copyright (C) 2020-2024 Moritz Zwerger
  *
  * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
  *
@@ -37,6 +37,6 @@ class DummyFramebuffer : Framebuffer {
     override fun bindTexture() {
     }
 
-    override fun resize(size: Vec2i) {
+    override fun resize(size: Vec2i, scale: Float) {
     }
 }

src/main/java/de/bixilon/minosoft/config/profile/profiles/rendering/RenderingProfile.kt

@@ -1,6 +1,6 @@
 /*
  * Minosoft
- * Copyright (C) 2020-2023 Moritz Zwerger
+ * Copyright (C) 2020-2024 Moritz Zwerger
  *
  * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
  *
@@ -26,6 +26,7 @@ import de.bixilon.minosoft.config.profile.profiles.rendering.light.LightC
 import de.bixilon.minosoft.config.profile.profiles.rendering.movement.MovementC
 import de.bixilon.minosoft.config.profile.profiles.rendering.overlay.OverlayC
 import de.bixilon.minosoft.config.profile.profiles.rendering.performance.PerformanceC
+import de.bixilon.minosoft.config.profile.profiles.rendering.quality.QualityC
 import de.bixilon.minosoft.config.profile.profiles.rendering.sky.SkyC
 import de.bixilon.minosoft.config.profile.profiles.rendering.textures.TexturesC
 import de.bixilon.minosoft.config.profile.storage.ProfileStorage
@@ -53,6 +54,7 @@ class RenderingProfile(
     val overlay = OverlayC(this)
     val sky = SkyC(this)
     val textures = TexturesC(this)
+    val quality = QualityC(this)
 
 
     override fun toString(): String {

src/main/java/de/bixilon/minosoft/config/profile/profiles/rendering/quality/QualityC.kt

@@ -0,0 +1,21 @@
+/*
+ * Minosoft
+ * Copyright (C) 2020-2024 Moritz Zwerger
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * This software is not affiliated with Mojang AB, the original developer of Minecraft.
+ */
+
+package de.bixilon.minosoft.config.profile.profiles.rendering.quality
+
+import de.bixilon.minosoft.config.profile.profiles.rendering.RenderingProfile
+import de.bixilon.minosoft.config.profile.profiles.rendering.quality.resolution.ResolutionC
+
+class QualityC(profile: RenderingProfile) {
+    val resolution = ResolutionC(profile)
+}

src/main/java/de/bixilon/minosoft/config/profile/profiles/rendering/quality/resolution/ResolutionC.kt

@@ -0,0 +1,34 @@
+/*
+ * Minosoft
+ * Copyright (C) 2020-2024 Moritz Zwerger
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * This software is not affiliated with Mojang AB, the original developer of Minecraft.
+ */
+
+package de.bixilon.minosoft.config.profile.profiles.rendering.quality.resolution
+
+import de.bixilon.minosoft.config.profile.delegate.primitive.FloatDelegate
+import de.bixilon.minosoft.config.profile.profiles.rendering.RenderingProfile
+
+class ResolutionC(profile: RenderingProfile) {
+
+    /**
+     * Scale of the gui (and hud) framebuffer. If you change this, the font will look weird and maybe blurry. Do not change this.
+     */
+    var guiScale by FloatDelegate(profile, 1.0f, ranges = arrayOf(0.0001f..4.0f))
+
+    /**
+     * Scale of the world (blocks, entities, particles, ...) framebuffer.
+     * If you lower this, the framebuffer will be smaller and thus performance should go up.
+     * This is only useful when your gpu is bottlenecked by the number of pixels/texels
+     * (e.g. if you make the window smaller, your fps go up)
+     * Otherwise do not change this, this will not reduce cpu load or gpu load of other stages.
+     */
+    var worldScale by FloatDelegate(profile, 1.0f, ranges = arrayOf(0.0001f..4.0f))
+}

src/main/java/de/bixilon/minosoft/gui/rendering/framebuffer/FramebufferManager.kt

@@ -1,6 +1,6 @@
 /*
  * Minosoft
- * Copyright (C) 2020-2023 Moritz Zwerger
+ * Copyright (C) 2020-2024 Moritz Zwerger
  *
  * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
  *
@@ -33,8 +33,8 @@ class FramebufferManager(
         gui.init()
 
         context.connection.events.listen<ResizeWindowEvent> {
-            world.framebuffer.resize(it.size)
-            gui.framebuffer.resize(it.size)
+            world.resize(it.size)
+            gui.resize(it.size)
         }
     }
 

src/main/java/de/bixilon/minosoft/gui/rendering/framebuffer/IntegratedFramebuffer.kt

@@ -1,6 +1,6 @@
 /*
  * Minosoft
- * Copyright (C) 2020-2023 Moritz Zwerger
+ * Copyright (C) 2020-2024 Moritz Zwerger
  *
  * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
  *
@@ -13,6 +13,7 @@
 
 package de.bixilon.minosoft.gui.rendering.framebuffer
 
+import de.bixilon.kotlinglm.vec2.Vec2i
 import de.bixilon.minosoft.gui.rendering.RenderContext
 import de.bixilon.minosoft.gui.rendering.renderer.drawable.Drawable
 import de.bixilon.minosoft.gui.rendering.system.base.BlendingFunctions
@@ -54,4 +55,9 @@ interface IntegratedFramebuffer : Drawable {
         shader.use()
         mesh.draw()
     }
+
+    fun resize(size: Vec2i) = resize(size, 1.0f)
+    fun resize(size: Vec2i, scale: Float) {
+        framebuffer.resize(size, scale)
+    }
 }

src/main/java/de/bixilon/minosoft/gui/rendering/framebuffer/gui/GUIFramebuffer.kt

@@ -1,6 +1,6 @@
 /*
  * Minosoft
- * Copyright (C) 2020-2023 Moritz Zwerger
+ * Copyright (C) 2020-2024 Moritz Zwerger
  *
  * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
  *
@@ -13,6 +13,8 @@
 
 package de.bixilon.minosoft.gui.rendering.framebuffer.gui
 
+import de.bixilon.kotlinglm.vec2.Vec2i
+import de.bixilon.kutil.observer.DataObserver.Companion.observe
 import de.bixilon.minosoft.gui.rendering.RenderContext
 import de.bixilon.minosoft.gui.rendering.framebuffer.FramebufferMesh
 import de.bixilon.minosoft.gui.rendering.framebuffer.FramebufferShader
@@ -28,4 +30,15 @@ class GUIFramebuffer(
     override val framebuffer: Framebuffer = context.system.createFramebuffer(color = true, depth = false)
     override val mesh = FramebufferMesh(context)
     override var polygonMode: PolygonModes = PolygonModes.DEFAULT
+
+    private var scale = 1.0f
+
+    override fun init() {
+        super.init()
+        context.connection.profiles.rendering.quality.resolution::guiScale.observe(this, instant = true) { this.scale = it }
+    }
+
+    override fun resize(size: Vec2i) {
+        super.resize(size, this.scale)
+    }
 }

src/main/java/de/bixilon/minosoft/gui/rendering/framebuffer/world/WorldFramebuffer.kt

@@ -1,6 +1,6 @@
 /*
  * Minosoft
- * Copyright (C) 2020-2023 Moritz Zwerger
+ * Copyright (C) 2020-2024 Moritz Zwerger
  *
  * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
  *
@@ -13,6 +13,8 @@
 
 package de.bixilon.minosoft.gui.rendering.framebuffer.world
 
+import de.bixilon.kotlinglm.vec2.Vec2i
+import de.bixilon.kutil.observer.DataObserver.Companion.observe
 import de.bixilon.minosoft.gui.rendering.RenderContext
 import de.bixilon.minosoft.gui.rendering.framebuffer.FramebufferMesh
 import de.bixilon.minosoft.gui.rendering.framebuffer.FramebufferShader
@@ -35,6 +37,8 @@ class WorldFramebuffer(
     override val mesh = FramebufferMesh(context)
     override var polygonMode: PolygonModes = PolygonModes.DEFAULT
 
+    private var scale = 1.0f
+
     override fun init() {
         framebuffer.init()
         defaultShader.load()
@@ -43,6 +47,7 @@ class WorldFramebuffer(
         mesh.load()
 
         overlay.init()
+        context.connection.profiles.rendering.quality.resolution::worldScale.observe(this, instant = true) { this.scale = it }
     }
 
     override fun postInit() {
@@ -56,4 +61,8 @@ class WorldFramebuffer(
         super.draw()
         overlay.draw()
     }
+
+    override fun resize(size: Vec2i) {
+        super.resize(size, this.scale)
+    }
 }

src/main/java/de/bixilon/minosoft/gui/rendering/system/base/RenderSystem.kt

@@ -1,6 +1,6 @@
 /*
  * Minosoft
- * Copyright (C) 2020-2023 Moritz Zwerger
+ * Copyright (C) 2020-2024 Moritz Zwerger
  *
  * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
  *
@@ -142,7 +142,7 @@ interface RenderSystem {
 
     fun createIntUniformBuffer(data: IntArray = IntArray(0)): IntUniformBuffer
     fun createFloatUniformBuffer(data: FloatBuffer): FloatUniformBuffer
-    fun createFramebuffer(color: Boolean, depth: Boolean): Framebuffer
+    fun createFramebuffer(color: Boolean, depth: Boolean, scale: Float = 1.0f): Framebuffer
 
     fun createTextureManager(): TextureManager
 

src/main/java/de/bixilon/minosoft/gui/rendering/system/base/buffer/frame/Framebuffer.kt

@@ -1,6 +1,6 @@
 /*
  * Minosoft
- * Copyright (C) 2020-2022 Moritz Zwerger
+ * Copyright (C) 2020-2024 Moritz Zwerger
  *
  * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
  *
@@ -28,5 +28,5 @@ interface Framebuffer {
 
     fun bindTexture()
 
-    fun resize(size: Vec2i)
+    fun resize(size: Vec2i, scale: Float = 1.0f)
 }

src/main/java/de/bixilon/minosoft/gui/rendering/system/opengl/OpenGLRenderSystem.kt

@@ -98,6 +98,7 @@ class OpenGLRenderSystem(
             }
             if (value == null) {
                 glBindFramebuffer(GL_FRAMEBUFFER, 0)
+                viewport = context.window.size
             } else {
                 check(value is OpenGLFramebuffer) { "Can not use non OpenGL framebuffer!" }
                 value.bind()
@@ -238,7 +239,7 @@ class OpenGLRenderSystem(
     override fun readPixels(start: Vec2i, end: Vec2i): TextureBuffer {
         val size = Vec2i(end.x - start.x, end.y - start.y)
         val buffer = RGB8Buffer(size)
-        glReadPixels(start.x, start.y, end.x, end.y, GL_RGB8, GL_UNSIGNED_BYTE, buffer.data)
+        glReadPixels(start.x, start.y, end.x, end.y, GL_RGB8, GL_UNSIGNED_BYTE, buffer.data) // TODO: This is somehow through a GL_INVALID_ENUM error
         return buffer
     }
 
@@ -258,8 +259,8 @@ class OpenGLRenderSystem(
         return IntOpenGLUniformBuffer(this, uniformBufferBindingIndex++, data)
     }
 
-    override fun createFramebuffer(color: Boolean, depth: Boolean): OpenGLFramebuffer {
-        return OpenGLFramebuffer(this, context.window.size, color, depth)
+    override fun createFramebuffer(color: Boolean, depth: Boolean, scale: Float): OpenGLFramebuffer {
+        return OpenGLFramebuffer(this, context.window.size, scale, color, depth)
     }
 
     override fun createTextureManager(): OpenGLTextureManager {

src/main/java/de/bixilon/minosoft/gui/rendering/system/opengl/buffer/frame/OpenGLFramebuffer.kt

@@ -1,6 +1,6 @@
 /*
  * Minosoft
- * Copyright (C) 2020-2023 Moritz Zwerger
+ * Copyright (C) 2020-2024 Moritz Zwerger
  *
  * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
  *
@@ -29,9 +29,11 @@ import org.lwjgl.opengl.GL30.*
 class OpenGLFramebuffer(
     val system: OpenGLRenderSystem,
     var size: Vec2i,
+    var scale: Float,
     val color: Boolean,
     val depth: Boolean,
 ) : Framebuffer {
+    private var scaled = size
     override var state: FramebufferState = FramebufferState.PREPARING
         private set
 
@@ -43,21 +45,23 @@ class OpenGLFramebuffer(
 
     override fun init() {
         check(state != FramebufferState.COMPLETE) { "Framebuffer is complete!" }
+        if (scale <= 0.0f) throw IllegalArgumentException("Invalid scale: $scale")
+        if (size.x <= 0 || size.y <= 0) throw IllegalArgumentException("Invalid framebuffer size: $size")
         system.log { "Generated framebuffer buffer $this" }
         id = glGenFramebuffers()
         unsafeBind()
 
-        glViewport(0, 0, size.x, size.y)
+        this.scaled = if (scale == 1.0f) size else Vec2i(size.x * scale, size.y * scale)
 
         if (color) {
-            val colorTexture = OpenGLFramebufferColorTexture(size)
+            val colorTexture = OpenGLFramebufferColorTexture(scaled)
             this.colorTexture = colorTexture
             colorTexture.init()
             attach(colorTexture)
         }
 
         if (depth) {
-            val depth = OpenGLRenderbuffer(system, RenderbufferModes.DEPTH_COMPONENT24, size)
+            val depth = OpenGLRenderbuffer(system, RenderbufferModes.DEPTH_COMPONENT24, scaled)
             this.depthBuffer = depth
             depth.init()
             attach(depth)
@@ -75,6 +79,7 @@ class OpenGLFramebuffer(
     fun bind() {
         check(state == FramebufferState.COMPLETE) { "Framebuffer is incomplete: $state" }
         unsafeBind()
+        system.viewport = scaled
     }
 
     private fun unsafeBind() {
@@ -108,12 +113,14 @@ class OpenGLFramebuffer(
         depthTexture?.bind(1)
     }
 
-    override fun resize(size: Vec2i) {
-        if (size == this.size) {
+    override fun resize(size: Vec2i, scale: Float) {
+        if (size.x <= 0 || size.y <= 0) throw IllegalArgumentException("Invalid framebuffer size: $size")
+        if (size == this.size && this.scale == scale) {
             return
         }
         colorTexture?.unload()
         depthBuffer?.unload()
+        this.scale = scale
         this.size = size
         delete()
         init()

src/main/java/de/bixilon/minosoft/gui/rendering/system/window/glfw/GLFWWindow.kt

@@ -1,6 +1,6 @@
 /*
  * Minosoft
- * Copyright (C) 2020-2023 Moritz Zwerger
+ * Copyright (C) 2020-2024 Moritz Zwerger
  *
  * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
  *
@@ -190,6 +190,7 @@ class GLFWWindow(
             setOpenGLVersion(3, 3, true)
         }
         glfwWindowHint(GLFW_VISIBLE, false.glfw)
+        glfwWindowHint(GLFW_ALPHA_BITS, 0)
         glfwWindowHint(GLFW_DEPTH_BITS, 0)
         glfwWindowHint(GLFW_STENCIL_BITS, 0)
 

src/main/java/de/bixilon/minosoft/protocol/PlayerPublicKey.kt

@@ -36,13 +36,11 @@ class PlayerPublicKey(
 
     constructor(nbt: JsonObject) : this(Instant.ofEpochMilli(nbt["expires_at"].toLong()), CryptManager.getPlayerPublicKey(nbt["key"].toString()), nbt["signature"].toString().fromBase64())
 
-    fun toNbt(): JsonObject {
-        return mapOf(
-            "expires_at" to expiresAt.epochSecond,
-            "key" to publicKey.encoded.toBase64(),
-            "signature" to signature.toBase64(),
-        )
-    }
+    fun toNbt() = mapOf(
+        "expires_at" to expiresAt.epochSecond,
+        "key" to publicKey.encoded.toBase64(),
+        "signature" to signature.toBase64(),
+    )
 
     fun isExpired(): Boolean {
         return expiresAt.isAfter(Instant.now())