[Mesa-dev] initial mesa/st RG support

[Ian Romanick]

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Dave Airlie wrote:
> Started playing around with adding RG support to st/mesa
> http://cgit.freedesktop.org/~airlied/mesa/?h=gallium-rg
> 
> I'm guessing there is a bit more to  do, I'm not sure r300/r500 can
> render to RG, which is what I'm playing about with.

The FBO tests are structured so that the driver can report
GL_FRAMEBUFFER_UNSUPPORTED for any of the RED or RG formats without
failing.  A good first pass would be to just enable RED and RG for
texturing and always GL_FRAMEBUFFER_UNSUPPORTED for FBO rendering.  I
had planned to do that for i965, but it turned out to be really easy to
get it working on that hardware.
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