[Bug 41263] [r600g] glCopyTexImage2D selects a texture format that involves fallback to software

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=41263

--- Comment #2 from Simon Farnsworth <simon.farnsworth at onelan.co.uk> 2011-09-28 10:07:53 PDT ---
I think it may be core Mesa at fault.

main/teximage.c:2779

         gl_format texFormat = _mesa_choose_texture_format(ctx, texObj,
                                                           target, level,
                                                           internalFormat,
                                                           GL_NONE, GL_NONE);

is called when internalFormat is GL_RGB. Gallium, not unreasonably, treats this
as "choose a nice fast GL_RGB style format", and chooses a reversed format to
that of the source. The result is a slow software copy, not a fast hardware
copy.

So, two possibilities present themselves to me:

1) Gallium should learn to do swizzled hardware blits with a textured quad.
2) Core Mesa should give Gallium more information about the source, so that it
can choose a matching format if possible.

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