i use dependency walker to discover that
so how opengl implements gpu-acceleration on windows
why opengl needs directdraw on windows
It shouldn't need directdraw.i use dependency walker to discover that
so how opengl implements gpu-acceleration on windows
OpenGL is implemented by the hardware manufacturer (in the driver).
DirectDraw is not the DirectX. DirectDraw is a 2D API which allows direct access to video memory and is probably used for accelerating final image output (rendered with OpenGL) to the window or full screen.
Even though OpenGL rendering is performed on the GPU, the result still needs to composited with the window manager (especially when not in fullscreen mode). Interacting with DirectDraw for some part of this is entirely plausible.
Beware that it's Direct3D the accelerated one, DirectDraw is supposed to be the software renderer... But yeah, completely clueless, unless it's going through the software OpenGL implementation from Microsoft. Then again I have absolutely no idea how OpenGL is implemented internally, so who knows.
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