Usually, there's no user-specified texture swizzle so we can optimize
the swizzle_swizzle() function and skip the loop/switch.
---
src/mesa/state_tracker/st_atom_texture.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/src/mesa/state_tracker/st_atom_texture.c
b/src/mesa/state_tracker/st_atom_texture.c
index a613533..19df662 100644
--- a/src/mesa/state_tracker/st_atom_texture.c
+++ b/src/mesa/state_tracker/st_atom_texture.c
@@ -59,6 +59,11 @@ swizzle_swizzle(unsigned swizzle1, unsigned swizzle2)
{
unsigned i, swz[4];
+ if (swizzle1 == SWIZZLE_XYZW) {
+ /* identity swizzle, no change to swizzle2 */
+ return swizzle2;
+ }
+
for (i = 0; i < 4; i++) {
unsigned s = GET_SWZ(swizzle1, i);
switch (s) {
--
1.9.1
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