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OpenGL [directx9] asynchronous gpu pixel upload

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I'm working on procedural surfaces and textures (software rendering)


I've tested several ways to do it ( texture with DYNAMIC_USAGE, backbuffer with DONOTWAIT in LockRect() function, updateTexture() / updateSurface()... )


Whatever approach i use, i have cpu-cycles-spoiling, seems that the cpu is looping waiting gpu has finished copying the pixels.


I found in openGL a tool made to avoid this cpu-spoil (Pixel Buffer Object) based on a double-buffer, so cpu doesn't need to wait the end of copy... i'd like to do the equivalent in directx.

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