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bcsenteri

Capture OpenGL surface?

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Hi I'm not OpenGL expert so please excuse me if my question will be a dumb one. I need to send an OpenGL draw aplication to a small LCD which means I have to capture it. I can do this capturing the whole desktop but when something overlaps the OpenGL window, the overlapped content is captured. Is there any way to capture an OpenGL drawn window directly to have his content no matter of the window's Z order? regards, B.

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The standard explicitely defines the content of occluded areas as undefined. If you need reliable buffers, you need to use an offscreen rendering buffer such as pbuffers or framebuffer objects.

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The window what has to be captured can be any OpenGL window - it's not my aplicaton. So I cannot use double buffer or anything else since the aplication already exists.

I was afraid from Your answer ... So it seems that is no way to capture the content of an OpenGL aplication if that one is not visible ...

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