From 614602e7cdda79510b85700c130fede42375d81f Mon Sep 17 00:00:00 2001
From: Harrison <yunyangdeng@gmail.com>
Date: Tue, 7 Jul 2020 01:07:14 -0500
Subject: [PATCH] MeshBatch now records states to reduce data sent to shader
 per call.

---
 .../Graphics/Render/MeshBatch.cs               | 13 ++++++++++---
 .../Utilities/Playground/MainState.cs          | 18 +++++++++---------
 2 files changed, 19 insertions(+), 12 deletions(-)

diff --git a/src/SlatedGameToolkit.Framework/Graphics/Render/MeshBatch.cs b/src/SlatedGameToolkit.Framework/Graphics/Render/MeshBatch.cs
index cd3878c..3685134 100644
--- a/src/SlatedGameToolkit.Framework/Graphics/Render/MeshBatch.cs
+++ b/src/SlatedGameToolkit.Framework/Graphics/Render/MeshBatch.cs
@@ -17,6 +17,7 @@ namespace SlatedGameToolkit.Framework.Graphics.Render
         private float batchDelta;
         public GLContext GLContext {get; private set; }
         private int projALoc, viewALoc, modelALoc, texturedALoc, singleChanneledALoc, flippedALoc;
+        private bool flipped, singleChanneled;
         private Camera camera;
         private RenderProgram renderProgram;
         private ITexture texture;
@@ -31,7 +32,7 @@ namespace SlatedGameToolkit.Framework.Graphics.Render
         private int[] verticeOffsets;
         private int dataIndex, indicesIndex, offsetIndex;
 
-        public MeshBatch(Camera camera, RenderProgram renderProgram = null, uint BatchVertexSize = 4096) {
+        public MeshBatch(Camera camera, RenderProgram renderProgram = null, uint BatchVertexSize = 1024) {
             if (renderProgram == null) {
                 VertexShader vert = new VertexShader(EmbeddedResUtils.ReadEmbeddedResourceText("default.vert"));
                 FragmentShader frag = new FragmentShader(EmbeddedResUtils.ReadEmbeddedResourceText("default.frag"));
@@ -94,8 +95,14 @@ namespace SlatedGameToolkit.Framework.Graphics.Render
                 GLContext.Uniform1i(texturedALoc, texture == null ? 0 : 1);
             }
             if (texture != null) {
-                GLContext.Uniform1i(singleChanneledALoc, texture.SingleChanneled ? 1 : 0);
-                GLContext.Uniform1i(flippedALoc, texture.Flipped ? 1 : 0);
+                if (flipped != texture.Flipped) {
+                    GLContext.Uniform1i(flippedALoc, texture.Flipped ? 1 : 0);
+                    this.flipped = texture.Flipped;
+                }
+                if (singleChanneled != texture.SingleChanneled) {
+                    GLContext.Uniform1i(singleChanneledALoc, texture.SingleChanneled ? 1 : 0);
+                    this.singleChanneled = texture.SingleChanneled;
+                }
             }
             ValueTuple<Vector3, Vector2>[] vertices = mesh.Vertices;
             uint[] indices = mesh.Elements;
diff --git a/src/SlatedGameToolkit.Tools/Utilities/Playground/MainState.cs b/src/SlatedGameToolkit.Tools/Utilities/Playground/MainState.cs
index 6800451..85fbd62 100644
--- a/src/SlatedGameToolkit.Tools/Utilities/Playground/MainState.cs
+++ b/src/SlatedGameToolkit.Tools/Utilities/Playground/MainState.cs
@@ -17,7 +17,7 @@ namespace SlatedGameToolkit.Tools.Utilities.Playground
     {
         private WindowContext window;
         private Camera2D camera;
-        private MeshBatch renderer;
+        private MeshBatch batch;
         private BitmapFont font;
         private Texture logoTexture, fillerTexture;
         private RectangleMesh logo, textureTester, untextured;
@@ -40,7 +40,7 @@ namespace SlatedGameToolkit.Tools.Utilities.Playground
             logoTexture.Dispose();
             fillerTexture.Dispose();
             font.Dispose();
-            renderer.Dispose();
+            batch.Dispose();
             window.Dispose();
         }
 
@@ -55,7 +55,7 @@ namespace SlatedGameToolkit.Tools.Utilities.Playground
             Vector2 drawableDimensions = window.GetDrawableDimensions();
             float ratio = drawableDimensions.Y / drawableDimensions.X;
             camera = new Camera2D(2f, ratio * 2f);
-            renderer = new MeshBatch(camera);
+            batch = new MeshBatch(camera, BatchVertexSize: 2048);
 
             logoTexture = TextureLoader.Load2DTexture("Resources/Playground/yhdnbgnc.png");
             logo = new RectangleMesh(logoTexture, Color.White);
@@ -84,12 +84,12 @@ namespace SlatedGameToolkit.Tools.Utilities.Playground
 
         public void Render(double delta)
         {
-            renderer.Begin(Matrix4x4.Identity, delta);
-            renderer.Draw(logo);
-            renderer.Draw(textureTester);
-            renderer.Draw(untextured);
-            font.WriteLine(renderer, 0.25f, -0.35f, "ABCDEFGHIJKLMNOPQRSTUVWXYZ\n1234567890", Color.White);
-            renderer.End();
+            batch.Begin(Matrix4x4.Identity, delta);
+            batch.Draw(logo);
+            batch.Draw(textureTester);
+            batch.Draw(untextured);
+            font.WriteLine(batch, 0.25f, -0.35f, "ABCDEFGHIJKLMNOPQRSTUVWXYZ\n1234567890", Color.White);
+            batch.End();
         }
 
         public void Update(double timeStep)