viewport background color
Author
I want to clear multiple viewports each with its own color. What is the best way to do it?
glClearColor (r1, g1, b1, a1);
...
glViewport (x1, y1, w1, h1);
...
glClearColor (r2, g2, b2, a2);
...
glViewport (x2, y2, w2, h2);
...
glViewport (x1, y1, w1, h1);
...
glClearColor (r2, g2, b2, a2);
...
glViewport (x2, y2, w2, h2);
Author
glClear doesn't seem to be restricted by the current viewport, it clears the entire screen.
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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