public FPSTestState(TextureManager textureManager)
 {
     _textureManager = textureManager;
     _font = new Font(textureManager.Get("font"),
         FontParser.Parse("font.fnt"));
     _fpsText = new Text("FPS:", _font);
 }
        public DrawSpriteState(TextureManager textureManager)
        {
            _textureManager = textureManager;
            Texture texture = _textureManager.Get("face_alpha");
            Gl.glEnable(Gl.GL_TEXTURE_2D);
            Gl.glBindTexture(Gl.GL_TEXTURE_2D, texture.Id);
            Gl.glEnable(Gl.GL_BLEND);
            Gl.glBlendFunc(Gl.GL_SRC_ALPHA, Gl.GL_ONE_MINUS_SRC_ALPHA);

        }