Mesa (master): st/mesa: add comment to explain _min(), _maxf(), etc. functions
Brian Paul
brianp at kemper.freedesktop.org
Tue Feb 25 19:38:15 UTC 2014
Module: Mesa
Branch: master
Commit: c88a0b6af318c02b2ffa6958187672da9b3838ce
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=c88a0b6af318c02b2ffa6958187672da9b3838ce
Author: Brian Paul <brianp at vmware.com>
Date: Tue Feb 25 09:53:49 2014 -0700
st/mesa: add comment to explain _min(), _maxf(), etc. functions
Reviewed-by: Marek Olšák <marek.olsak at amd.com>
---
src/mesa/state_tracker/st_extensions.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/src/mesa/state_tracker/st_extensions.c b/src/mesa/state_tracker/st_extensions.c
index d053efb..18ddd4e 100644
--- a/src/mesa/state_tracker/st_extensions.c
+++ b/src/mesa/state_tracker/st_extensions.c
@@ -39,6 +39,12 @@
#include "st_extensions.h"
#include "st_format.h"
+
+/*
+ * Note: we use these function rather than the MIN2, MAX2, CLAMP macros to
+ * avoid evaluating arguments (which are often function calls) more than once.
+ */
+
static unsigned _min(unsigned a, unsigned b)
{
return (a < b) ? a : b;
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