Merge pull request #443 from Unity-Technologies/mobile-fixes

OpenGL ES 3: Disable ColorGrading 3D lut code path

Author: Chman

PostProcessing/Runtime/Effects/ColorGrading.cs

@@ -176,7 +176,8 @@ public override void Render(PostProcessRenderContext context)
             var gradingMode = settings.gradingMode.value;
             var supportComputeTex3D = SystemInfo.supports3DRenderTextures
                 && SystemInfo.supportsComputeShaders
-                && SystemInfo.graphicsDeviceType != GraphicsDeviceType.OpenGLCore;
+                && SystemInfo.graphicsDeviceType != GraphicsDeviceType.OpenGLCore
+                && SystemInfo.graphicsDeviceType != GraphicsDeviceType.OpenGLES3;
 
             if (gradingMode == GradingMode.External)
                 RenderExternalPipeline3D(context);