From: divverent <divverent@d7cf8633-e32d-0410-b094-e92efae38249>
Date: Fri, 25 Sep 2009 20:58:44 +0000 (+0000)
Subject: add an ugly hack to reflections/refractions to "behave" when otherwise black edges... 
X-Git-Tag: xonotic-v0.1.0preview~1399
X-Git-Url: https://git.rm.cloudns.org/?a=commitdiff_plain;h=30115b3a83815b83a72c82f1b1a912c3c32305a0;p=xonotic%2Fdarkplaces.git

add an ugly hack to reflections/refractions to "behave" when otherwise black edges would appear


git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@9234 d7cf8633-e32d-0410-b094-e92efae38249
---

diff --git a/gl_rmain.c b/gl_rmain.c
index a30e6e60..33a255ba 100644
--- a/gl_rmain.c
+++ b/gl_rmain.c
@@ -1065,7 +1065,24 @@ static const char *builtinshaderstring =
 "\n"
 "	vec4 ScreenScaleRefractReflectIW = ScreenScaleRefractReflect * (1.0 / ModelViewProjectionPosition.w);\n"
 "	//vec4 ScreenTexCoord = (ModelViewProjectionPosition.xyxy + normalize(myhalf3(texture2D(Texture_Normal, TexCoord)) - myhalf3(0.5)).xyxy * DistortScaleRefractReflect * 100) * ScreenScaleRefractReflectIW + ScreenCenterRefractReflect;\n"
-"	vec4 ScreenTexCoord = ModelViewProjectionPosition.xyxy * ScreenScaleRefractReflectIW + ScreenCenterRefractReflect + vec2(normalize(myhalf3(texture2D(Texture_Normal, TexCoord)) - myhalf3(0.5))).xyxy * DistortScaleRefractReflect;\n"
+"	vec4 SafeScreenTexCoord = ModelViewProjectionPosition.xyxy * ScreenScaleRefractReflectIW + ScreenCenterRefractReflect;\n"
+"	vec4 ScreenTexCoord = SafeScreenTexCoord + vec2(normalize(myhalf3(texture2D(Texture_Normal, TexCoord)) - myhalf3(0.5))).xyxy * DistortScaleRefractReflect;\n"
+"	// FIXME temporary hack to detect the case that the reflection\n"
+"	// gets blackened at edges due to leaving the area that contains actual\n"
+"	// content.\n"
+"	// Remove this 'ack once we have a better way to stop this thing from\n"
+"	// 'appening.\n"
+"	float f = 1;\n"
+"	f *= min(1, length(texture2D(Texture_Refraction, ScreenTexCoord.xy + vec2(0.05, 0.05))) / 0.02);\n"
+"	f *= min(1, length(texture2D(Texture_Refraction, ScreenTexCoord.xy + vec2(0.05, -0.05))) / 0.02);\n"
+"	f *= min(1, length(texture2D(Texture_Refraction, ScreenTexCoord.xy + vec2(-0.05, 0.05))) / 0.02);\n"
+"	f *= min(1, length(texture2D(Texture_Refraction, ScreenTexCoord.xy + vec2(-0.05, -0.05))) / 0.02);\n"
+"	f *= min(1, length(texture2D(Texture_Reflection, ScreenTexCoord.zw + vec2(0.05, 0.05))) / 0.02);\n"
+"	f *= min(1, length(texture2D(Texture_Reflection, ScreenTexCoord.zw + vec2(0.05, -0.05))) / 0.02);\n"
+"	f *= min(1, length(texture2D(Texture_Reflection, ScreenTexCoord.zw + vec2(-0.05, 0.05))) / 0.02);\n"
+"	f *= min(1, length(texture2D(Texture_Reflection, ScreenTexCoord.zw + vec2(-0.05, -0.05))) / 0.02);\n"
+"	ScreenTexCoord = mix(SafeScreenTexCoord, ScreenTexCoord, f);\n"
+"	// END OF UGLY UGLY UGLY HACK\n"
 "	float Fresnel = pow(min(1.0, 1.0 - float(normalize(EyeVector).z)), 2.0) * ReflectFactor + ReflectOffset;\n"
 "	gl_FragColor = mix(texture2D(Texture_Refraction, ScreenTexCoord.xy) * RefractColor, texture2D(Texture_Reflection, ScreenTexCoord.zw) * ReflectColor, Fresnel);\n"
 "}\n"