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Buffer Functions

To copy the contents of an off-screen buffer to an on-screen buffer, call SwapBuffers. The SwapBuffers function takes a handle to a device context. The current pixel format for the specified device context must include a back buffer. By default, the back buffer is off-screen, and the front buffer is on-screen.

Note   The SwapBuffers function does not really swap the contents of the two buffers, but rather copies the contents of one buffer to another. The contents of the off-screen buffer are undefined after a call to SwapBuffers. Thus, the result of two consecutive calls to SwapBuffers is undefined.

The following illustration shows how the contents of the buffers are copied when calling SwapBuffers.

Dd318280.opengl00(en-us,VS.85).png

Several OpenGL core functions also manage buffers. The glDrawBuffer function is the one most relevant to double buffering; it specifies the framebuffer or buffers that OpenGL draws into.

The following functions also affect buffers:

 

 

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Build date: 3/6/2012

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