code: function _AlphaState() {
                  this._isAlphaBlendDirty = false;
                  this._isBlendFunctionParametersDirty = false;
                  this._isBlendEquationParametersDirty = false;
                  this._isBlendConstantsDirty = false;
                  this._alphaBlend = false;
                  this._blendFunctionParameters = new Array(4);
                  this._blendEquationParameters = new Array(2);
                  this._blendConstants = new Array(4);
                  this.reset();
              }
docs: Initializes the state.