Elance Exams Answers PDF file

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When do you use glFlush and glFinish?

You use glFlush to clear the screen and glFinish to draw the screen to the display.
Usually around certain operations, such as during a glReadPixel after writing, or when OpenGL must flush or finish its currently buffered calls. Their utility has decreased over time.
glFlush and glFinish should be called once and only once per application. Their utility has increased over time and is required for any OpenGL application no matter how simple (a three line demo) or complex (a 450,000 AAA video game).
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