From: divverent <divverent@d7cf8633-e32d-0410-b094-e92efae38249>
Date: Sat, 30 Oct 2010 18:19:38 +0000 (+0000)
Subject: offsetmapping: make it work on ATI Radeon 9500-9800/X300 again
X-Git-Tag: xonotic-v0.1.0preview~88
X-Git-Url: https://git.rm.cloudns.org/?a=commitdiff_plain;h=a2ab764a5ee51518cabc116240eacd3094c2ea10;p=xonotic%2Fdarkplaces.git

offsetmapping: make it work on ATI Radeon 9500-9800/X300 again

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@10571 d7cf8633-e32d-0410-b094-e92efae38249
::stable-branch::merge=2138c1a71154ae6661f42f9491f0a9e3d363d5c0
---

diff --git a/gl_rmain.c b/gl_rmain.c
index 9dd6a532..b6cd1527 100644
--- a/gl_rmain.c
+++ b/gl_rmain.c
@@ -1142,15 +1142,14 @@ static const char *builtinshaderstring =
 "	RT += OffsetVector * (step(texture2D(Texture_Normal, RT.xy).a, RT.z) * 0.0625 - 0.03125);\n"
 "	return RT.xy;\n"
 "#else\n"
-"	// 3 sample offset mapping (only 3 samples because of ATI Radeon 9500-9800/X300 limits)\n"
+"	// 2 sample offset mapping (only 2 samples because of ATI Radeon 9500-9800/X300 limits)\n"
 "	// this basically moves forward the full distance, and then backs up based\n"
 "	// on height of samples\n"
 "	//vec2 OffsetVector = vec2(EyeVector.xy * ((1.0 / EyeVector.z) * OffsetMapping_Scale) * vec2(-1, 1));\n"
 "	//vec2 OffsetVector = vec2(normalize(EyeVector.xy) * OffsetMapping_Scale * vec2(-1, 1));\n"
 "	vec2 OffsetVector = vec2(normalize(EyeVector).xy * OffsetMapping_Scale * vec2(-1, 1));\n"
 "	TexCoord += OffsetVector;\n"
-"	OffsetVector *= 0.333;\n"
-"	TexCoord -= OffsetVector * texture2D(Texture_Normal, TexCoord).a;\n"
+"	OffsetVector *= 0.5;\n"
 "	TexCoord -= OffsetVector * texture2D(Texture_Normal, TexCoord).a;\n"
 "	TexCoord -= OffsetVector * texture2D(Texture_Normal, TexCoord).a;\n"
 "	return TexCoord;\n"