[Mesa-dev] [PATCH 0/8] i965: Adding TXD/textureGrad support.
kenneth at whitecape.org
Wed Jun 15 01:24:47 PDT 2011
I'd really like to land this for 7.11---apparently Wine applications
really want GL_ARB_shader_texture_lod in place for SM3 shaders.
The extension adds two parts: textureLod in the fragment shader, and
textureGrad in both targets. Lod works fine. Grad...is tricky.
Much more testing is required. So far, I've run Marek's piglit test
(arb_shader_texture_lod-texgrad) on Sandybridge and Ivybridge. One
pixel fails the probe (Eric thinks it's due to a pre-existing bug in
our dFdy implementation), but visually it looks correct.
So I think color buffers work fine. Unfortunately, shadow2DGrad and
depth textures are where all the madness comes into play. It's very
likely broken, especially on pre-Ivybridge. But that's sooo niche. :)
Anyway, I figured some initial review wouldn't hurt. Better than
letting this code languish any longer.
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