[Mesa-dev] [PATCH 2/2] softpipe: fix blending for luminance/intensity surfaces

[Marek Olšák]

On Thu, Sep 15, 2011 at 5:38 PM, Brian Paul <brian.e.paul at gmail.com> wrote:
> From: Brian Paul <brianp at vmware.com>
>
> If we're drawing to a luminance, luminance/alpha or intensity surface
> we have to adjust (rebase) the fragment/quad colors before writing them
> to the tile cache.  The tile cache always stores RGBA colors but if
> we're caching a L/A surface (for example) we need to be sure that R=G=B
> so that subsequent reads from the surface cache appear to return L/A
>
> We previously had a special case for RGB (no alpha) surfaces.  This
> change generalizes that for the other base formats.
>
> Fixes https://bugs.freedesktop.org/show_bug.cgi?id=40408, but sRGB
> formats are still failing.  That'll be addressed in a later patch.

The fbo-blending-formats test isn't complete for sRGB yet and it's not
in all.tests for the very same reason. It might work with
GL_FRAMEBUFFER_SRGB disabled though, not sure.

Marek