On 02/22/2011 03:52 AM, Marek Olšák wrote:
Brian,
I realized that this clear color translation is wrong because it won't
work for multiple render targets. It's possible to have mixed format
attachments like one with GL_LUMINANCE8_ALPHA8 and another one with
GL_RGBA8 in slots 0 and 1 respectively, the ARB_fbo spec allows it. I
think we should let drivers swizzle the clear color for each active
render target separately if they need it.
I thought of that too and was going to look at that again when I had
more time. I should have noted such in the commit message or code.
For now, I don't know of any apps that mix color buffers like that so
I think we're safe for the short term.
For example, we setup r300 to only read the R and A components for
LUMINANCE8_ALPHA8, so it doesn't need any help from the state tracker,
and the other render targets are unaffected. r500 and later GPUs *can*
do mixed attachments.
OK.
-Brian
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