From: divverent <divverent@d7cf8633-e32d-0410-b094-e92efae38249>
Date: Mon, 28 May 2007 13:35:07 +0000 (+0000)
Subject: glsl doesn't allow dividing by zero (result is undefined, although sane on nvidia... 
X-Git-Tag: xonotic-v0.1.0preview~3082
X-Git-Url: https://git.rm.cloudns.org/?a=commitdiff_plain;h=cbf992aa69db144bffd4bd16d8339ba808fcaddc;p=xonotic%2Fdarkplaces.git

glsl doesn't allow dividing by zero (result is undefined, although sane on nvidia), so...
-"      color.rgb = SceneBrightness / (ContrastBoostCoeff + 1 / color.rgb);\n"
+"      color.rgb = color.rgb * SceneBrightness / (ContrastBoostCoeff * color.rgb + 1);\n"
also gains some fps apparently (7600GT here)
Weirdly, *= seems to be by 3fps slower than using = and *


git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@7378 d7cf8633-e32d-0410-b094-e92efae38249
---

diff --git a/gl_rmain.c b/gl_rmain.c
index 8243ef92..fb2fc698 100644
--- a/gl_rmain.c
+++ b/gl_rmain.c
@@ -656,7 +656,10 @@ static const char *builtinshaderstring =
 "#endif\n"
 "\n"
 "#ifdef USECONTRASTBOOST\n"
-"	color.rgb = SceneBrightness / (ContrastBoostCoeff + 1 / color.rgb);\n"
+//"	color.rgb = SceneBrightness / (ContrastBoostCoeff + 1 / color.rgb);\n"
+//"	color.rgb *= SceneBrightness / (ContrastBoostCoeff * color.rgb + 1);\n"
+"	color.rgb = color.rgb * SceneBrightness / (ContrastBoostCoeff * color.rgb + 1);\n"
+//"	color.rgb *= SceneBrightness; color.rgb /= ContrastBoostCoeff * color.rgb + 1;\n"
 "#else\n"
 "	color.rgb *= SceneBrightness;\n"
 "#endif\n"