Optimized texture lerping on boundary conditions

Author: Chman

CHANGELOG.md

@@ -6,6 +6,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [2.1.1] - 2018-xx-xx
 
+### Fixed
+- Optimized volume texture blending.
+
 ### Changed
 - Chromatic aberration is now forced to "fast mode" when running on GLES2.0 platforms due to compatibility issues.
 

PostProcessing/Runtime/Utils/TextureLerper.cs

@@ -108,6 +108,10 @@ internal Texture Lerp(Texture from, Texture to, float t)
             if (from == to)
                 return from;
 
+            // Don't need to lerp boundary conditions
+            if (t <= 0f) return from;
+            if (t >= 1f) return to;
+
             bool is3D = from is Texture3D
                     || (from is RenderTexture && ((RenderTexture)from).volumeDepth > 1);
 
@@ -129,8 +133,12 @@ internal Texture Lerp(Texture from, Texture to, float t)
                 m_Command.SetComputeTextureParam(compute, kernel, "_From", from);
                 m_Command.SetComputeTextureParam(compute, kernel, "_To", to);
 
-                int groupSizeXY = Mathf.CeilToInt(size / 8f);
-                int groupSizeZ = Mathf.CeilToInt(size / 8f);
+                uint tgsX, tgsY, tgsZ;
+                compute.GetKernelThreadGroupSizes(kernel, out tgsX, out tgsY, out tgsZ);
+                Assert.AreEqual(tgsX, tgsY);
+                int groupSizeXY = Mathf.CeilToInt(size / (float)tgsX);
+                int groupSizeZ = Mathf.CeilToInt(size / (float)tgsZ);
+
                 m_Command.DispatchCompute(compute, kernel, groupSizeXY, groupSizeXY, groupSizeZ);
                 return rt;
             }

package.json

@@ -1,6 +1,6 @@
 {
     "name": "com.unity.postprocessing",
-    "version": "2.1.0",
+    "version": "2.1.1",
     "displayName": "Post Processing",
     "unity": "2018.1",
     "description": "The post-processing stack (v2) comes with a collection of effects and image filters you can apply to your cameras to improve the visuals of your games.",