CommandBuffer.SetRenderTarget doesn't works on Android

The goal:

In custom SRP I need to render offscreen lowres buffer. It would be used by some shader on scene.

The idea:

1. Create temporary render texture with lower size
2. Set it as render target
3. Render something
4. Switch render target back to camera target
5. Render shaders, that needs this render texture
6. Release render texture

To simplify, on step 3 I just call ClearRenderTarget() to fill texture with some color.

The code:

Pipeline code is very basic with just Renderer.Render() call.

Spoiler: CustomRenderPipeline

Code (CSharp):

1. private readonly CameraRenderer cameraRenderer = new CameraRenderer();
2.  
3. protected override void Render(ScriptableRenderContext context, Camera[] cameras) {
4.     var pipelineAsset = GraphicsSettings.currentRenderPipeline as CustomRenderPipelineAsset;
5.     if (pipelineAsset == null) return;
6.     foreach (var camera in cameras) {
7.         cameraRenderer.Render(context, camera, pipelineAsset);
8.     }
9. }

Renderer draws the offscreen buffer first, than sets render target to cameraTarget and draws scene content.

Spoiler: CameraRenderer

Code (CSharp):

1. public void Render(ScriptableRenderContext context, Camera camera, CustomRenderPipelineAsset pipelineAsset)
2. {
3.     // Setup camera, buffer, etc.
4.     DrawOffscreenBuffer(pipelineAsset);
5.     DrawVisibleGeometry();
6.     Cleanup();
7.     // Execute buffer and submit context.
8. }
9.  
10. private void DrawOffscreenBuffer(CustomRenderPipelineAsset pipelineAsset)
11. {
12.     var renderScale = pipelineAsset.renderScale;
13.     buffer.GetTemporaryRT(renderBufferID,
14.         (int) (camera.pixelWidth * renderScale),
15.         (int) (camera.pixelHeight * renderScale), 24);
16.     buffer.SetRenderTarget(renderBufferID,
17.         RenderBufferLoadAction.DontCare,
18.         RenderBufferStoreAction.DontCare);
19.  
20.     buffer.ClearRenderTarget(true, true, Color.cyan);
21.  
22.     buffer.SetRenderTarget(BuiltinRenderTextureType.CameraTarget);
23.     ExecuteBuffer();
24. }
25.  
26. private void DrawVisibleGeometry()
27. {
28.     // Draw scene content.
29. }
30.  
31. private void Cleanup()
32. {
33.     buffer.ReleaseTemporaryRT(renderBufferID);
34. }

Shader inverts the color

Spoiler: Shader

Code (CSharp):

1. sampler2D _RenderBuffer;
2. half4 _RenderBuffer_TexelSize;
3.  
4. interpolators vert(vertexInput v)
5. {
6.    interpolators o;
7.    o.clipPosition = UnityObjectToClipPos(v.objectPosition);
8.    o.backgroundPosition = ComputeGrabScreenPos(o.clipPosition);
9.    return o;
10. }
11.  
12. half3 frag(interpolators i) : SV_TARGET
13. {
14.    half3 outputColor;
15.    outputColor.rgb = 1 - tex2Dproj(_RenderBuffer, i.backgroundPosition);
16.    return outputColor;
17. }

The result:

UnityEditor on Windows directX - how it should look like.

Spoiler: Unity

Frame debugger info.

Spoiler: Editor Frame debugger

Android OpenGLES 3 - for some reason render texture is black (shader inverts the color).

Spoiler: Android

But in the frame debugger it looks the same as in the first case.

Spoiler: Android Frame debugger

So, questions:

1. Why SetRenderTarget on OpenGLES3 doesn't do what it should do?
2. Is the problem really in SetRenderTarget, or it can be somwhere else?

 

Did you find any solution to this problem?

 

Have you tried setting the "RenderBufferLoadAction" to load and "RenderBufferStoreAction" to store?

You should explicitly set the load & store actions on mobile platforms, or it'll be set to don't care.

 

Yes I did. I followed post and added "RanderBufferLoad" and "RanderBufferStore" actions to both load and store but it's not working.
https://issuetracker.unity3d.com/is...r-dot-setrendertarget-doesnt-works-on-android

 

Perhaps it's not the same issue. Have you tried testing your effect on desktop OpenGL?

 

It works in editor.

 

I suggest making a bug report with a project that can reproduce the issue.