GPGPU pipeline working on iOS 9, not on OS X 10.11
Emmanuel D'ANGELO
I’m checking the GPGPU possibilities with Metal, and I have a small test app that creates a Compute pipeline and all the required objects, encoders, etc. This pipeline then launches a shader that writes some test data (like a gradient based on the current pixel position) to a texture and fetches this data back. The texture is created as 8 bit RGBA and accessed in the shader as floating-point, write-only (using MTLTextureusageShaderWrite in the texture descriptor).
All this seems to work fine (no error is launched at any point even when I had a look at a reflection object, arguments are bounds correctly to shader argument tables, etc).
However, while this test app works fine on iOS, I constantly get a zero-everywhere output on MacOS, and I have no clue on what’s going on or how to investigate further.
Am I missing something that would be OS X specific? Or is there any way where I could try to debug / investigate the issue?
For the hardware side, I’m using a MBP Early 2013, and I get the same issue with the integrated Intel HD4000 and the NVIDIA GT650M. I’m running OS X 10.11.3 now, but I already got the same issue with 10.11.2.
Any help would be greatly appreciated!
Best regards,
Emmanuel
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