Slow GPU bake and blown out baking cycles render #46207
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Reference: blender/blender#46207
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System Information
Card name: AMD Radeon (TM) R9 Fury Series
Card name: AMD FirePro W8100 (FireGL V)
Operating System: Windows Embedded 8.1 Industry Pro 64-bit (6.3, Build 9600) (9600.winblue_ltsb.150715-0840)
Processor: Intel(R) Core(TM) i7-5820K CPU @ 3.30GHz (12 CPUs), ~3.3GHz
Memory: 32768MB RAM
Blender Version
Broken: 2.7.6rc1 and 2.7.5.4
Short description of error
When baking in GPU compute am receiving blown out Ambient Occlusion and Normal maps. Works fine in CPU.
when baked with CPU: http://snag.gy/BlvA7.jpg
when baked with GPU: http://snag.gy/SsJI3.jpg
Exact steps for others to reproduce the error
Switch mode to cycles render. Add Suzanne smart uv unwrap her. Add image texture in node editor, and create and use a texture. Switch device to GPU compute in render properties. Switch Bake type to Ambient Occlusion or Normals.
Changed status to: 'Open'
Added subscriber: @edisto
#48130 was marked as duplicate of this issue
I realized after posting that techs might not be familiar with baking. So I attached a premade file that just requires you to hit bake within the render properties under bake tab.
bakeTest2.blend
I'm guessing this bug probably has something to do with my Radeon Fury X.
Edit
The moment I posted that comment I remembered I could go to system and use a single card. After checking It does it on both cards. So the Radeon Fury X and Firepro w8100.
Added subscriber: @Sergey
Can confirm OpemCL is producing totally wrong result. Not totally sure yet why, will need to have a closer look.
Added subscriber: @brecht
Findings so far:
clFinish()
between baking samples does not solve the issue (though we should add it)MEM_READ_WRITE
does not solve the issue (though we should do that)Commenting out some parts of the code in the kernel seems to make it work, though I'm not sure if that's avoiding some kind of race condition, working around a compiler bug, or something else.
Added subscriber: @VeloFX
This issue was referenced by
d2bb0e660b
Changed status from 'Open' to: 'Resolved'
This issue was referenced by blender/cycles@78ab79ade6