[Dri-devel] GL_DECAL and texture corruption fixes for MGA driver

[Karl L. <klessard@Matrox.COM>]

Hi everybody,

this patch fixes some problems in texturing in the mga driver.

1) It fixes a texture corruption problem, as the mga driver did not use 
the right texture format in some case
      ( I've seen that when an application wants to store a texture in 
RGB5_A1, but it is actually stored in ARGB8 by Mesa).

2) I've enabled again the hardware acceleration for GL_DECAL texture 
function, for both single and multi-texturing. Blending in single 
texturing needs to be emulated through multi-texturing, and problems 
with multi-texturing were probably relied to the bug above (as in Tribes2).

That way, anybody who tries to play Tribes2 with a mga board will be 
impressed by the improvment made by this patch. Please, try it!
As this patch is my first one (wouhou!) , I want to ask you too what's 
the procedures to send a patch and get it approved before it can be 
included in the CVS repository. I did this patch too by using fresh 
XFree-4.1.0 sources, since I don't have access to the DRI cvs tree 
through our firewall.

Thank you!

Karl