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gallium/docs: document TGSI_SEMANTIC_EDGEFLAG

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Brian Paul
2010-06-23 17:38:58 -06:00
parent a544a8a82a
commit 7315300fa5
1 changed files with 9 additions and 1 deletions
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10
src/gallium/docs/source/tgsi.rst
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@@ -1397,7 +1397,15 @@ back-facing.
TGSI_SEMANTIC_EDGEFLAG TGSI_SEMANTIC_EDGEFLAG
"""""""""""""""""""""" """"""""""""""""""""""
XXX no clue For vertex shaders, this sematic label indicates that an input or
output is a boolean edge flag. The register layout is [F, x, x, x]
where F is 0.0 or 1.0 and x = don't care. Normally, the vertex shader
simply copies the edge flag input to the edgeflag output.
Edge flags are used to control which lines or points are actually
drawn when the polygon mode converts triangles/quads/polygons into
points or lines.
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