[Mesa-dev] [PATCH] add support for GL_RGBA + GL_UNSIGNED_INT_8_8_8_8 in st_fast_readpixels

[Pierre-Eric]

As Lightsmark seems to make use of glReadPixels with {GL_RGBA +
GL_UNSIGNED_INT_8_8_8_8} parameters,
I built a short patch to allow 'st_fast_readpixels' to handle this combination.

It's been tested using piglit's pixelFormat test + a custom app.

Best regards,
--Pierre-Eric
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