gl_shader: use glConfig2 instead of cvar (it can be disabled if hardw…

…are is too weak)

Use glConfig2 instead of cvar (it can be disabled if hardware is too weak).

Also delete an unused define (the USE_PHYSICAL_MAPPING macro is used instead).

src/engine/renderer/gl_shader.cpp

@@ -729,7 +729,7 @@ static std::string GenEngineConstants() {
 		AddDefine( str, "r_showLightTiles", 1 );
 	}
 
-	if ( r_normalMapping->integer )
+	if ( glConfig2.normalMapping )
 	{
 		AddDefine( str, "r_normalMapping", 1 );
 	}
@@ -739,16 +739,11 @@ static std::string GenEngineConstants() {
 		AddDefine( str, "r_liquidMapping", 1 );
 	}
 
-	if ( r_specularMapping->integer )
+	if ( glConfig2.specularMapping )
 	{
 		AddDefine( str, "r_specularMapping", 1 );
 	}
 
-	if ( r_physicalMapping->integer )
-	{
-		AddDefine( str, "r_physicalMapping", 1 );
-	}
-
 	if ( r_glowMapping->integer )
 	{
 		AddDefine( str, "r_glowMapping", 1 );