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gallium: switch dedicated centroid field to interpolation location

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The new location field can be either center, centroid, or sample, which
indicates the location that the shader should interpolate at.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
This commit is contained in:
Ilia Mirkin
2014-07-01 20:54:01 -04:00
parent e3b16294cb
commit 4c97ed4411
17 changed files with 57 additions and 31 deletions
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5
src/gallium/docs/source/tgsi.rst
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@@ -2735,6 +2735,11 @@ This token is only valid for fragment shader INPUT declarations.
The Interpolate field specifes the way input is being interpolated by
the rasteriser and is one of TGSI_INTERPOLATE_*.
The Location field specifies the location inside the pixel that the
interpolation should be done at, one of ``TGSI_INTERPOLATE_LOC_*``. Note that
when per-sample shading is enabled, the implementation may choose to
interpolate at the sample irrespective of the Location field.
The CylindricalWrap bitfield specifies which register components
should be subject to cylindrical wrapping when interpolating by the
rasteriser. If TGSI_CYLINDRICAL_WRAP_X is set to 1, the X component