mesa: comments for some state vars
diff --git a/src/mesa/shader/prog_statevars.h b/src/mesa/shader/prog_statevars.h
index d309114..909bce0 100644
--- a/src/mesa/shader/prog_statevars.h
+++ b/src/mesa/shader/prog_statevars.h
@@ -79,10 +79,10 @@
STATE_SHININESS,
STATE_HALF_VECTOR,
- STATE_POSITION,
- STATE_ATTENUATION,
- STATE_SPOT_DIRECTION,
- STATE_SPOT_CUTOFF,
+ STATE_POSITION, /**< xyzw = position */
+ STATE_ATTENUATION, /**< xyz = attenuation, w = spot exponent */
+ STATE_SPOT_DIRECTION, /**< xyz = direction, w = cos(cutoff) */
+ STATE_SPOT_CUTOFF, /**< x = cutoff, yzw = undefined */
STATE_TEXGEN_EYE_S,
STATE_TEXGEN_EYE_T,