Z-buffer load

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DAVE HOATSON (hoatso++at++aaicorp.com)
Tue, 16 Mar 1999 12:35:53 -0500

I need to load a color image and a depth image into the frame buffer. The image is a previously rendered static background composed of terrain, sky, clouds, and buildings. In my application, a dynamic aircraft will be rendered into the frame buffer after the background image is loaded.

Currently, I am using "glDrawPixels(WIDTH, HEIGHT, GL_DEPTH_COMPONENT, GL_UNSIGNED_BYTE, depthBuf)"

Although loading the color buffer (in RGBA mode) is fast, loading the depth buffer is very slow. How can I speed this operation up? Can I get a pointer to the Z-buffer and copy the depth image directly, avoiding "glDrawPixels"? Is there a particular frame buffer configuration which allows this operation to execute faster? On the O2, is the Z-buffer located in the standard Unified Memory Architecture RAM? I am running the application on an R5k O2. Thanks.
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              

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