OpenGL2: Add r_glossIsRoughness.

code/renderergl2/tr_shade.c

@@ -449,11 +449,10 @@ static void ComputeShaderColors( shaderStage_t *pStage, vec4_t baseColor, vec4_t
 		|| ((blend & GLS_DSTBLEND_BITS) == GLS_DSTBLEND_SRC_COLOR)
 		|| ((blend & GLS_DSTBLEND_BITS) == GLS_DSTBLEND_ONE_MINUS_SRC_COLOR);
 
-	qboolean isWorldDraw = !(backEnd.refdef.rdflags & RDF_NOWORLDMODEL);
-
 #if defined(USE_OVERBRIGHT)
 	float exactLight = 1.0f;
 #else
+	qboolean isWorldDraw = !(backEnd.refdef.rdflags & RDF_NOWORLDMODEL);
 	float exactLight = (isBlend || !isWorldDraw) ? 1.0f : (float)(1 << r_mapOverBrightBits->integer);
 #endif