better restoration algorithm

Author: illwieckz

src/engine/renderer/glsl_source/cameraEffects_fp.glsl

@@ -136,15 +136,13 @@ void main()
 			{
 				float t = threshold - ( i * ( threshold / 10 ) );
 
-				bvec3 cutoff = lessThan( mapped, vec3(t) );
-
-				#if __VERSION__ > 120
-					vec3 interpolation = vec3(0.5f) * vec3(cutoff);
-				#else
-					vec3 interpolation = 0.5f * cutoff;
-				#endif
-
-				mapped = mix( mapped, color.rgb, interpolation );
+				if ( ( color.r + color.g + color.b ) < ( 3 * threshold ) )
+				{
+					if ( ( mapped.r + mapped.g + mapped.b ) < ( 3 * threshold ) )
+					{
+						mapped = mix( mapped, color.rgb, 0.5f );
+					}
+				}
 			}
 
 			color.rgb = mapped;