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drawing on C++ Builder Components

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i already know how to draw to a TPanel in c++ builder 5 but i need doublebuffering to make it not flicker and swapping the buffers slows things down alot. i was wondering if anyone knows how i can draw on top of the components using the same rendering context as my original window. i would set the viewport when switching between. also, my program only needs to draw to a certain chunk of the screen and i was planning on using glScissor. would that help to speed things up?

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