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crocomire

viewport background color

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glClearColor (r1, g1, b1, a1);
...
glViewport (x1, y1, w1, h1);
...
glClearColor (r2, g2, b2, a2);
...
glViewport (x2, y2, w2, h2);

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glScissor will restrict the area cleared. Since the viewport does not prevent fragments from being generated outside the viewport, I advice you to keep the viewport and the scissor box in sync, unless you have a good reason not to, of course. That way, you will never touch anything outside the viewport, and that includes glClear.

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