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I am using OpenGL 4.0 (although I am also interested in a solution for previous versions). I basically want to access the front buffer, or the back buffer before the swap, an copy/paint it into my own buffer, so I can either save it in a file, or stream it, etc. Extra points if I can access directly as a YUV 420 file.
Just use
glReadPixels. Preferably into a pixel buffer, if you like performance.It’s not stored as YUV 420.