Comment # 2
on bug 101572
from Matias N. Goldberg
That can't be right. You're suggesting that in order to synchronize writes from FBO with a Compute Shader I am going to dispatch (which btw the Compute Shader is accessing this fbo as a regular sample fetch, not via imageLoad/imageStore) then I either need to: 1. Switch to a dummy FBO, something that is mentioned nowhere: neither on manuals or online documentation, wikis, or tutorials; also it's not mentioned to be a guarantee in the spec either. 2. Use a function that was added in OpenGL 4.5; when Compute Shaders were added in 4.3. I may be misinterpreting the spec; but these solution don't make any sense. Best case Mesa should detect that I am trying to read from an FBO in a compute shader being dispatched and issue a barrier for me; worst case one of the functionality already present in 4.3 (like glMemoryBarrier) that doesn't look esoteric (like switching FBOs) should be enough to synchronize.
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