public ArtMulResource(GraphicsDevice graphics)
 {
     m_Graphics  = graphics;
     m_FileIndex = ClientVersion.InstallationIsUopFormat ?
                   FileManager.CreateFileIndex("artLegacyMUL.uop", 0x10000, false, ".tga") :
                   FileManager.CreateFileIndex("artidx.mul", "art.mul", 0x10000, -1); // !!! must find patch file reference for artdata.
     m_StaticPicking          = new PixelPicking();
     m_LandTileTextureCache   = new Texture2D[0x10000];
     m_StaticTileTextureCache = new Texture2D[0x10000];
 }