Roland Scheidegger wrote:
Ian Romanick wrote:
Another good test would be to modify progs/demos/pixeltexl to use
ATI_fs instead of SGIS_pixel_texture.
Sounds actually not that easy. Or maybe I just don't understand the spec
there very well.
The basic idea of GL_SGIS_pixel_texture and the pixeltex.c demo is
that each RGB value sent to glDrawPixels is converted into an STR
texture coordinate. The texture is sampled with those coordinates and
the resulting colors get drawn where glDrawPixels would normally put
them.
It's a kind of primordial dependent texture lookup.
-Brian
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