When you use generic double-buffered rendering on Microsoft Windows 2000 or Microsoft Windows XP, rendering to a child window can suffer from clipping problems. This also can occur in SDI and MDI applications because these applications render to a child window by default.

The typical behavior is that the right and bottom window borders are not rendered upon (are black) when the window is enlarged beyond its initial size.

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This behavior does not occur if a hardware-accelerated pixel format is used (on systems that contain hardware acceleration). This behavior occurs only with generic pixel formats (typically on unaccelerated systems).

To work around this problem, render to a DIB (or DIBSection) as demonstrated by the GLDib sample.

For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

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Microsoft has confirmed this to be a bug in the generic implementation of OpenGL for Windows 2000.

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