Scissor Test And Framebuffer Clearing
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Why doesn't glClear() work for areas outside the scissor rectangle?[edit]
The OpenGL Specification states that glClear() only clears the scissor rectangle when the scissor test is enabled. If you want to clear the entire window, use the code:
glDisable(GL_SCISSOR_TEST);
// glClear(...);
glEnable(GL_SCISSOR_TEST);