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

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

mhopf at suse.de changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |eich at pdx.freedesktop.org,
                   |                            |xorg-bugzilla-
                   |                            |noise at freedesktop.org
             Status|NEW                         |ASSIGNED




------- Additional Comments From mhopf at suse.de  2004-11-02 08:51 -------
Ok, more info (just that so this is not lost):

It seems that the GPU does not fetch the new texture but uses its texture cache
until a sufficiently large (whatever that is) primitive is rendered.

I added a texture buffer ring so that no consecutive textures are stored into 
the same part of the video memory - with no effect.

I increased the minimum loaded texture size to 64x64 - with no effect.

I increased the minimum *drawn* texture to 64x8 -> everything looks all right!

Unfortunately, this is no solution, as the render system just has to be able to 
draw smaller parts of the texture. E.g. if I fix it for scrolling up (which I 
did by adding transparent lines below the current texture), I cannot use the 
same texture for scrolling down. And even if I fix both, it is possible that 
only a small span of the middle of the texture has to be rendered.

Two possible sollutions:
a) There must be some command like 'fetch the texture. do it now.'
b) For small textures draw a large version into a off-screen frame buffer before 
using it. This may sound horribly complicated or slow, but it shouldn't be.
However, the size of the texture that has to be drawn is some magic constant..        
   
   
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