[Mesa-dev] [PATCH] i965: Fix gl_TessLevelOuter for isolines.
kenneth at whitecape.org
Mon Mar 14 22:03:11 UTC 2016
On Monday, March 14, 2016 3:00:06 PM PDT Kenneth Graunke wrote:
> Thanks to James Legg for finding this!
> From the ARB_tessellation_shader spec:
> "The number of isolines generated is derived from the first outer
> tessellation level; the number of segments in each isoline is
> derived from the second outer tessellation level."
> According to the PRM, "TF.LineDensity determines # lines" while
> "TF.LineDetail determines # segments". Line Density is stored at
> DWord 6, while Line Detail is at DWord 7. So, they're not reversed
> like they are for triangles and quads.
I forgot to add this to the commit message:
Fixes Piglit's spec/arb_tessellation_shader/execution/isoline,
and about 24 dEQP isoline tests (with GL_EXT_tessellation_shader
hacked on - it's not normally enabled).
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