Some video SW clean up and bug fixes. Did a hacky fix for bad light data. Add fog rendering. Add some offsets to make rasterized pixel locations and texture coordinates more accurate.

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@5361 8ced0084-cf51-0410-be5f-012b33b47a6e

Source/Plugins/Plugin_VideoSoftware/Src/Rasterizer.h

@@ -35,9 +35,8 @@ namespace Rasterizer
         float dfdx;
         float dfdy;
         float f0;
-        float x0;
-        float y0;
-        float GetValue(s32 x, s32 y) { return f0 + (dfdx * (x - x0)) + (dfdy * (y - y0)); }
+
+		float GetValue(float dx, float dy) { return f0 + (dfdx * dx) + (dfdy * dy); }
     };
 
 	struct RasterBlockPixel
@@ -57,4 +56,4 @@ namespace Rasterizer
     
 }
 
-#endif
+#endif