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

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 a30e6e6072251acc68ccd76f1a017e3c2dd65c3a..33a255bac0ece36e40667a174d72a5f94077ee83 100644 (file)
--- 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"