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OpenGL intel gpu behaves different

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Hello, I've written a 2d gui renderer in OpenGL and i don't clear the backbuffer and draw only changes of certain items; for example when the mouse moves over a button it lights up. This works on ATI and NVidia cards but unfortunately not on Intel. It looks like Intel uses different backbuffers and that means I have to redraw everything every frame. does anyone know a solution so I don't have to do this? Thanks, rene

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