[Mesa-dev] [PATCH] i965: Fix gl_TessLevelOuter[] for isolines.

Kenneth Graunke 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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