altering mga to use less mem for texture with dri

[Ed Sweetman <ed.sweetman@xxxxxxxxx>]

Yes, most uses of DRI are 3d and all. But it has some 2D uses.  You can 
achieve more 2d memory (the default mode i believe does not give 
adequeate memory to have multiple virtual desktops, multiple xvideo 
outputs and populate those desktops with a bunch of windows).
In mga_storm.c line 866 or so,  whatever line it is before this :
pMGADRIServer->textureOffset = (pMga->FbMapSize -
                                       pMGADRIServer->textureSize + 

                                       MGA_BUFFER_ALIGN) & 			 
                              ~MGA_BUFFER_ALIGN;

All you need on the line before that is the following command with your 
memory size in bytes you wanna fork over. The remaining memory can then 
be used by xaa and the server to do all the stuff you normally do when 
dri is not loaded.

pMGADRIServer->textureSize = SIZE_IN_BYTES;

This could easily just be coded into a configuration file option for the 
mga driver to give you the ability to change this without recompiling. I 
set it to 512KB, and i dont play any video games.



This is just a "just so ya know" post.  I've been annoyed by the fact 
that using some drm/dri features meant i had to fight with 2d 
performance, some other people may too.




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