Mesa (master): mesa/main: set PREFER_DP4 to match position_invarient code

[Keith Whitwell]

Module: Mesa
Branch: master
Commit: 22b417b75ce0e6658a5d1e0e80cb6c3fdf631774
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=22b417b75ce0e6658a5d1e0e80cb6c3fdf631774

Author: Keith Whitwell <keithw at vmware.com>
Date:   Fri May  1 18:20:42 2009 +0100

mesa/main: set PREFER_DP4 to match position_invarient code

This is a quick fix for z fighting in quake4 caused by the mismatch
between vertex transformation here and in the position_invarient code.
Full fix would be to make this driver-tunable and adjust both
position_invarient and ffvertex_prog.c code to respect driver
preferences.

---

 src/mesa/main/ffvertex_prog.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/src/mesa/main/ffvertex_prog.c b/src/mesa/main/ffvertex_prog.c
index 1ce5685..82e1c4a 100644
--- a/src/mesa/main/ffvertex_prog.c
+++ b/src/mesa/main/ffvertex_prog.c
@@ -319,7 +319,7 @@ static void make_state_key( GLcontext *ctx, struct state_key *key )
  * multiplications with DP4's or with MUL/MAD's?  SSE works better
  * with the latter, drivers may differ.
  */
-#define PREFER_DP4 0
+#define PREFER_DP4 1
 
 
 /* Use uregs to represent registers internally, translate to Mesa's