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glutPostRedisplay equivalent in Windows

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Been a while since I've messed with MFC/GDI stuff but, from looking at the documentation I think this would be the proper way to handle it. You can check the documentation for more of the flags to control which messages are sent to your windows procedure.

BOOL RedrawWindow(
HWND hWnd, // handle to window
CONST RECT *lprcUpdate, // update rectangle
HRGN hrgnUpdate, // handle to update region
UINT flags // array of redraw flags

/* If both the hrgnUpdate and lprcUpdate parameters are NULL, the entire client area is added to the update region. */

RedrawWindow(hWnd, NULL, NULL, RDW_UPDATENOW);

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