optimize generated vertex programs a bit

Use new internal state to avoid per-vertex normalization of static spot
direction vector. Use internal state for simpler per-vertex fog computations
(MAD instead of SUB/MUL for linear fog, EX2 instead of POW for EXP/EXP2 fog).
Simplify point size calc (2 MADs instead of MOV, MUL, MUL, DP3), and while
there fix it up (RSQ instead of RCP). All untested...

1 files changed, 2 insertions, 0 deletions

diff --git a/src/mesa/shader/program.h b/src/mesa/shader/program.h
index af06c03598..a0bde07762 100644
--- a/src/mesa/shader/program.h
+++ b/src/mesa/shader/program.h
@@ -190,6 +190,8 @@ enum state_index {
    STATE_NORMAL_SCALE,
    STATE_TEXRECT_SCALE,
    STATE_POSITION_NORMALIZED,   /* normalized light position */
+   STATE_FOG_PARAMS_OPTIMIZED,  /* for faster fog calc */
+   STATE_SPOT_DIR_NORMALIZED,   /* pre-normalized spot dir */
    STATE_INTERNAL_DRIVER	/* first available state index for drivers (must be last) */
 };