Mesa (gallium-docs): docs: Explain TGSI_SEMANTIC_NORMAL.

[Michał Król]

Module: Mesa
Branch: gallium-docs
Commit: 86b336f71b21c813a1fa890440553aedcfb08fa7
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=86b336f71b21c813a1fa890440553aedcfb08fa7

Author: Michal Krol <michal at vmware.com>
Date:   Mon Jan  4 13:38:58 2010 +0100

docs: Explain TGSI_SEMANTIC_NORMAL.

---

 src/gallium/docs/source/tgsi.rst |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/src/gallium/docs/source/tgsi.rst b/src/gallium/docs/source/tgsi.rst
index 492a1b7..ebee490 100644
--- a/src/gallium/docs/source/tgsi.rst
+++ b/src/gallium/docs/source/tgsi.rst
@@ -1253,7 +1253,8 @@ can be stored inside a four-component vector.
 TGSI_SEMANTIC_NORMAL
 """"""""""""""""""""
 
-XXX no clue.
+Vertex normal; could be used to implement per-pixel lighting for legacy APIs
+that allow mixing fixed-function and programmable stages.
 
 TGSI_SEMANTIC_FACE
 """"""""""""""""""