Re: framebuffer -> texture

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Phil Keslin (philk++at++cthulhu.engr.sgi.com)
Wed, 16 Jun 1999 12:06:23 -0700

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Ken Lindsay wrote:
>
> hi,
>
> is there a technique for using rendered framebuffer images as textures
> on other objects without copying back the data to main memory? i have
> RE2/MCO graphics with 4 RM boards. if RE2 can't do this, can IR/IR2?

You can use either glCopyTexSubImage2D or glCopyTexImage2D (there are
analogs for the 1D and 2D cases as well). Both of these calls should not
need to read back to the host for either RE2 or IR. On the RE2, however,
there is no texture readback support. If the texture is forced to swap
you will not get the correct texture when it is rebound.

- Phil

-- 
Phil Keslin <philk++at++engr.sgi.com>

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