diff options
| -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 f5678c744b..205e7b8539 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 |