Hey,

So I've been playing with radeon FBOs and have run into a problem with how 
to allow apps to get an FBOs that isn't swrast fallback :-)

radeons can by default render to ARGB8888, ARGB4444, RGB565 mostly, now in 
this case when the app asks for a texture format of GL_RGBA, 
GL_UNSIGNED_BYTE, we return by default a texture format, of 
&_mesa_texformat_rgba8888_rev

This allows us to do memcpy texture uploads in theory, however
when it comes time to render to that texture, I have to go hit a sw 
fallback which sucks badly.

I see my options as 
a) apps are smart, ignore problem and move on.
b) pick FBO friendly texture formats by default at the expense of textures
c) magically change the texture format when I realise something is 
rendering to it (is this possible any ideas?)
d) at least for r300, hack up the fragment shader to swizzle the outputs
though I think for dest blending this might not work like I think it 
would.

hopes nobody tells me the FBO spec covers this and I'm lazy :)

Dave.

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