So in classic drivers we can hit swrast fallbacks for things like ReadPixels where we know we aren't going to have to want to touch textures at all. This would be useful for the r300 driver where Maciej is working on texture tiling will allow us to avoid the untiling overheads that mapping textures requires for most sw fallbacks.
There may be other operations where we can do this also. For render to texture scenarios the driver should still map the textures via the FBOs anyways. Dave.
swrast_start_rfc.patch
Description: Binary data
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