[Bug 1424] Font rendering glitches with Render Acceleration enabled on radeon

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https://freedesktop.org/bugzilla/show_bug.cgi?id=1424        
   




------- Additional Comments From mhopf at suse.de  2004-11-02 08:57 -------
Created an attachment (id=1209)
 --> (https://freedesktop.org/bugzilla/attachment.cgi?id=1209&action=view)
Patch for pre-rendering small textures for Render Acceleration on R100

This patch adds pre-rendering of small textures to the R100 code path. They are

rendered to off-screen memory in order to invalidate the texture cache.

Note that this has to be dicussed before inclusion into mainline, because it
still is some sort of hack. The correct way to deal with the situation would be
to invalidate the texture cache without rendering large texture splats. If
anybody knows how to do this on R100, please respond!

The performance hit is measurable, but text output is still much faster than
w/o using RenderAccel, even for small regions (e.g. single chars).
Performance meassurement pending.

Note that the code relys on magic constants (in the top of the source) that
need to be verified, as they might depend on too many constraints for me to
test them all. So far verified with RV200 on 1024x768 with 2 different CPUs.

Please test, and if you still encounter glitches, feel free to change the
constants and add your values to this bugzilla entry.        
   
   
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