http://bugs.freedesktop.org/show_bug.cgi?id=25847





--- Comment #8 from Joakim Sindholt <b...@zhasha.com>  2010-01-02 08:52:53 PST 
---
Listen now, lots and lots of programs will check the extension string to
determine whether certain functionality is available. So say you check for GLSL
in order to do phong shading but in case it's not there you fall back to ff
light. Now we have a problem because that program will see "oh, I have GLSL,
let's shade away" and your application will run at horrendously bad speed.
In order to fall back intelligently you will face a slightly harder problem.
You can't read from textures in VRAM, and VRAM is where we store them to
achieve good speed. Falling back would require either constantly migrating
textures between VRAM and GART or just keeping them in GART thus taking a
serious performance hit on everything that samples from textures.

Now close your bug. I'm tired of getting e-mails of you acting smart.


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