From: Keith Whitwell <keithw@vmware.com>
Date: Fri, 1 May 2009 17:20:42 +0000 (+0100)
Subject: mesa/main: set PREFER_DP4 to match position_invarient code
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=22b417b75ce0e6658a5d1e0e80cb6c3fdf631774;p=mesa.git

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.
---

diff --git a/src/mesa/main/ffvertex_prog.c b/src/mesa/main/ffvertex_prog.c
index 1ce5685af45..82e1c4af665 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