reuse FloatBuffer in GUIMesh (reduce memory allocations)

doc/rendering/world_renderer.md

@@ -48,4 +48,3 @@
   - Reduce memory usage
   - Unload on minimize
   - Biomes: Check if chunk is single biome
-  - Texture rotation in hopper

src/main/java/de/bixilon/minosoft/gui/rendering/gui/hud/HUDRenderer.kt

@@ -49,6 +49,7 @@ import de.bixilon.minosoft.util.KUtil.synchronizedMapOf
 import de.bixilon.minosoft.util.KUtil.toResourceLocation
 import de.bixilon.minosoft.util.KUtil.toSynchronizedMap
 import de.bixilon.minosoft.util.KUtil.unsafeCast
+import de.bixilon.minosoft.util.collections.DirectArrayFloatList
 import glm_.glm
 import glm_.mat4x4.Mat4
 import glm_.vec2.Vec2
@@ -153,11 +154,15 @@ class HUDRenderer(
     }
 
     override fun drawOther() {
-        if (this::mesh.isInitialized) {
+        val data = if (this::mesh.isInitialized) {
             mesh.unload()
+            mesh.data.buffer.clear()
+            mesh.data
+        } else {
+            DirectArrayFloatList()
         }
 
-        mesh = GUIMesh(renderWindow, matrix)
+        mesh = GUIMesh(renderWindow, matrix, data)
         val hudElements = hudElements.toSynchronizedMap().values
 
         val time = System.currentTimeMillis()

src/main/java/de/bixilon/minosoft/gui/rendering/gui/hud/elements/other/CrosshairHUDElement.kt

@@ -25,6 +25,7 @@ import de.bixilon.minosoft.gui.rendering.input.camera.hit.BlockRaycastHit
 import de.bixilon.minosoft.gui.rendering.input.camera.hit.EntityRaycastHit
 import de.bixilon.minosoft.gui.rendering.system.base.BlendingFunctions
 import de.bixilon.minosoft.util.KUtil.toResourceLocation
+import de.bixilon.minosoft.util.collections.DirectArrayFloatList
 
 class CrosshairHUDElement(hudRenderer: HUDRenderer) : CustomHUDElement(hudRenderer) {
     private lateinit var crosshairAtlasElement: HUDAtlasElement
@@ -62,7 +63,7 @@ class CrosshairHUDElement(hudRenderer: HUDRenderer) : CustomHUDElement(hudRender
         val config = Minosoft.config.config.game.hud.crosshair
 
 
-        val mesh = GUIMesh(renderWindow, hudRenderer.matrix)
+        val mesh = GUIMesh(renderWindow, hudRenderer.matrix, DirectArrayFloatList(42))
 
         // Custom draw to make the crosshair inverted
         if (renderWindow.connection.player.gamemode == Gamemodes.SPECTATOR) {

src/main/java/de/bixilon/minosoft/gui/rendering/gui/mesh/GUIMesh.kt

@@ -19,6 +19,7 @@ import de.bixilon.minosoft.gui.rendering.RenderWindow
 import de.bixilon.minosoft.gui.rendering.system.base.texture.texture.AbstractTexture
 import de.bixilon.minosoft.gui.rendering.util.mesh.Mesh
 import de.bixilon.minosoft.gui.rendering.util.mesh.MeshStruct
+import de.bixilon.minosoft.util.collections.DirectArrayFloatList
 import glm_.mat4x4.Mat4
 import glm_.vec2.Vec2
 import glm_.vec2.Vec2t
@@ -28,7 +29,8 @@ import glm_.vec4.Vec4
 class GUIMesh(
     renderWindow: RenderWindow,
     val matrix: Mat4,
-) : Mesh(renderWindow, GUIMeshStruct, initialCacheSize = 40000), GUIVertexConsumer {
+    data: DirectArrayFloatList,
+) : Mesh(renderWindow, GUIMeshStruct, initialCacheSize = 40000, clearOnLoad = false, data = data), GUIVertexConsumer {
 
     override fun addVertex(position: Vec2t<*>, z: Int, texture: AbstractTexture, uv: Vec2, tint: RGBColor, options: GUIVertexOptions?) {
         data.addAll(createVertex(matrix, position, z, texture, uv, tint, options))

src/main/java/de/bixilon/minosoft/gui/rendering/util/mesh/Mesh.kt

@@ -25,9 +25,11 @@ abstract class Mesh(
     private val struct: MeshStruct,
     private val primitiveType: PrimitiveTypes = renderWindow.renderSystem.preferredPrimitiveType,
     initialCacheSize: Int = 10000,
+    val clearOnLoad: Boolean = true,
+    data: DirectArrayFloatList? = null,
 ) {
     val order = renderWindow.renderSystem.primitiveMeshOrder
-    private var _data: DirectArrayFloatList? = DirectArrayFloatList(initialCacheSize)
+    private var _data: DirectArrayFloatList? = data ?: DirectArrayFloatList(initialCacheSize)
     var data: DirectArrayFloatList
         get() = _data!!
         set(value) {
@@ -46,8 +48,10 @@ abstract class Mesh(
     fun load() {
         buffer = renderWindow.renderSystem.createVertexBuffer(struct, data.buffer, primitiveType)
         buffer.init()
-        data.unload()
+        if (clearOnLoad) {
-        _data = null
+            data.unload()
+            _data = null
+        }
         vertices = buffer.vertices
     }