Serious issues with Rage128 on PowerPC

[Ian Romanick]

I was trying to test the latest version of my ReadPixels work to make 
sure I didn't break anything on big-endian.  However, it seems someone 
beat me to it in the Rage128 driver. :)  In a nutshell, I can get one 
frame of gears, and then the 3D engine is toast.  After that frame is 
drawn, gears is at 100% and X is unresponsive.  When I kill gears, 
everything goes back to semi-normal.  If I run another 3D program, I get 
an empty (just a frame!) window.

Looking at the output from R128_DEBUG=all, it appears to be stuck in 
r128EmitHwStateLocked.

That single frame of gears is also wrong.  The colors are pinks and 
purples.  I suspect this may just be a byte-ordering problem.  I notice 
that the driver wants to use BGRA for primary color, but I suspect the 
hardware really wants ARGB.  Ditto for secondary color / fog.

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