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| author | Brian Paul <brianp@vmware.com> | 2010-06-23 17:38:58 -0600 |
|---|---|---|
| committer | Brian Paul <brianp@vmware.com> | 2010-06-23 17:38:58 -0600 |
| commit | 7315300fa5a5e63c16b9e258feb4df76176b5b4b (patch) | |
| tree | 462a1dd2deaff69a753937d79642e9388ea2135e | |
| parent | a544a8a82a74885e0c4bfb3a2c90d1bec07bd01e (diff) | |
gallium/docs: document TGSI_SEMANTIC_EDGEFLAG
| -rw-r--r-- | src/gallium/docs/source/tgsi.rst | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/src/gallium/docs/source/tgsi.rst b/src/gallium/docs/source/tgsi.rst index f5678c744b5..205e7b8539d 100644 --- a/src/gallium/docs/source/tgsi.rst +++ b/src/gallium/docs/source/tgsi.rst @@ -1397,7 +1397,15 @@ back-facing. 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. + Properties |