[Xorg] new kdrive patch for 32bpp support and hw composition

[Damien Ciabrini]

Hi all,

Following my previous posts, I've finally got time to do a new patch for 
supporting the matrox g4xx cards into kdrive.

This patch adds a proper support for 32bpp modes. It also fixes a race 
condition between the gfxcard and the processor that exists in the original 
mga driver.

Like the old patch, it allows to do HW alpha blending. It benefits from the 
two texture units of the g4xx.

I ran tests with the server in 32bpp with aewm, fdclock and xcompmgr. 
Everything seems to work correctly.

Jaymz (Julian), maybe you could test this patch with your hardware ?

Also, I'd like to know if it would be possible to merge my patches into the 
kdrive CVS ? I think it's desirable, since nobody seems to maintain this 
driver anymore. I don't know whom I must ask for this ?

Regards,

Damien
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