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render only when necessary

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Funkymunky    1413
i'm developing an editor programming. it uses opengl for the rendering, with multiple contexts for multiple windows. i don't need to render at 60fps, in fact i really only want to render when necessary. right now i just render on mouse movement, so i can easily run my mouse over it and see what it is, but what would be the best way to render only when the display needs updating?

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