[Mesa3d-dev] util_format cleanup leftover: Gallium BGRA vertex swizzles

[Marek O. <ma...@gm...>]

Please see this commit:
http://cgit.freedesktop.org/~mareko/mesa/commit/?id=177a4432aa88fc68d83895ae71b7ad2c86a1e7e3

Subject: [PATCH] gallium: fix BGRA vertex color swizzles

The mapping for vertex_array_bgra:
(gl -> st -> translate)
GL_RGBA -> PIPE_FORMAT_R8G8B8A8 (RGBA) -> no swizzle (XYZW)
GL_BGRA -> PIPE_FORMAT_A8R8G8B8 (ARGB) -> ZYXW (BGRA again??)

Iẗ́'s pretty clear that PIPE_FORMAT_A8R8G8B8 here is wrong. This commit
fixes the pipe format and removes obvious workarounds in util/translate.

Tested with: softpipe, llvmpipe, r300g.

Please review.

-Marek