- remove colormap from texture generation parameters. The one remaining special case, alpha texture on old hardware is now handled by the currently set texture mode at the time of use.

- use the cleaned up decal lighting code from the first GLEW branch.

src/gl/renderer/gl_lightdata.cpp

@@ -170,6 +170,7 @@ void gl_GetRenderStyle(FRenderStyle style, bool drawopaque, bool allowcolorblend
 	}
 	else if (style.Flags & STYLEF_InvertSource)
 	{
+		// The only place where InvertSource is used is for inverted sprites with the infrared powerup.
 		texturemode = TM_INVERSE;
 	}