From: eihrul <eihrul@d7cf8633-e32d-0410-b094-e92efae38249>
Date: Sun, 20 May 2012 14:24:52 +0000 (+0000)
Subject: slightly cheaper linear PCF sequence
X-Git-Tag: xonotic-v0.8.0~96^2~217
X-Git-Url: https://git.rm.cloudns.org/?a=commitdiff_plain;h=81ba94a32c7a34f72fc64d69529adfe62c07e750;p=xonotic%2Fdarkplaces.git

slightly cheaper linear PCF sequence


git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@11821 d7cf8633-e32d-0410-b094-e92efae38249
---

diff --git a/shader_glsl.h b/shader_glsl.h
index dbc19d57..b47f7609 100644
--- a/shader_glsl.h
+++ b/shader_glsl.h
@@ -883,9 +883,9 @@
 "#  else\n"
 "#   ifdef USESHADOWSAMPLER\n"
 "#     ifdef USESHADOWMAPPCF\n"
-"#       define texval(off) dp_shadow2D(Texture_ShadowMap2D, vec3((center + off)*ShadowMap_TextureScale, shadowmaptc.z))  \n"
-"	vec2 offset = fract(shadowmaptc.xy - 0.5), center = shadowmaptc.xy - offset;\n"
-"	vec4 size = vec4(offset + 1.0, 2.0 - offset), weight = vec4(2.0 - 1.0 / size.xy, 1.0 / size.zw - 1.0);\n"
+"#       define texval(off) dp_shadow2D(Texture_ShadowMap2D, vec3(off, shadowmaptc.z))  \n"
+"	vec2 offset = fract(shadowmaptc.xy - 0.5);\n"
+"	vec4 size = vec4(offset + 1.0, 2.0 - offset), weight = (vec4(2.0 - 1.0 / size.xy, 1.0 / size.zw - 1.0) + (shadowmaptc.xy - offset).xyxy)*ShadowMap_TextureScale.xyxy;\n"
 "	f = (1.0/9.0)*dot(size.zxzx*size.wwyy, vec4(texval(weight.zw), texval(weight.xw), texval(weight.zy), texval(weight.xy)));\n"
 "//#       define texval(x, y) dp_shadow2D(Texture_ShadowMap2D, vec3(center + vec2(x, y)*ShadowMap_TextureScale, shadowmaptc.z))  \n"
 "//	vec2 center = shadowmaptc.xy*ShadowMap_TextureScale;\n"