DMA from Alpha to Depth

From: Performer-ML (wryperf++at++dst.nk-exa.co.jp)
Date: 03/30/2000 22:46:55

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Hello,

Although this is an OpenGL question, it's also about
real-time graphics, so let me ask about this here please!

I have some fish-eye background images, and each image has
depth per pixel as its alpha values.
When drawing it with hemi-sphere geometries, I'd like to
draw its alpha values into depth buffer.

I know, glRead/DrawPixels can handle depth buffer, but
it isn't smart method because it has to use system memory.

I remember there was a routine called "zdraw" in IRIS-GL.
But I couldn't find the same functionarity in OpenGL...

When I use OpenGL, do I have to use glRead/DrawPixels ?
Or are there any other good methods ?

Thank you,

--
M.Y.

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