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gallium: add new semantics for tessellation

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Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Signed-off-by: Marek Olšák <marek.olsak@amd.com>
This commit is contained in:
Ilia Mirkin
2014-07-19 09:39:18 -04:00
committed by Marek Olšák
parent 88c4f5d0a5
commit 018aa27953
3 changed files with 48 additions and 1 deletions
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37
src/gallium/docs/source/tgsi.rst
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@@ -2894,6 +2894,43 @@ and only the X component is used.
FIXME: This right now can be either a ordinary input or a system value...
TGSI_SEMANTIC_PATCH
"""""""""""""""""""
For tessellation evaluation/control shaders, this semantic label indicates a
generic per-patch attribute. Such semantics will not implicitly be per-vertex
arrays.
TGSI_SEMANTIC_TESSCOORD
"""""""""""""""""""""""
For tessellation evaluation shaders, this semantic label indicates the
coordinates of the vertex being processed. This is available in XYZ; W is
undefined.
TGSI_SEMANTIC_TESSOUTER
"""""""""""""""""""""""
For tessellation evaluation/control shaders, this semantic label indicates the
outer tessellation levels of the patch. Isoline tessellation will only have XY
defined, triangle will have XYZ and quads will have XYZW defined. This
corresponds to gl_TessLevelOuter.
TGSI_SEMANTIC_TESSINNER
"""""""""""""""""""""""
For tessellation evaluation/control shaders, this semantic label indicates the
inner tessellation levels of the patch. The X value is only defined for
triangle tessellation, while quads will have XY defined. This is entirely
undefined for isoline tessellation.
TGSI_SEMANTIC_VERTICESIN
""""""""""""""""""""""""
For tessellation evaluation/control shaders, this semantic label indicates the
number of vertices provided in the input patch. Only the X value is defined.
Declaration Interpolate
^^^^^^^^^^^^^^^^^^^^^^^