code: function save() {
           this._colorStack.push(this.currentColor.clone());
  
           this._matrixStack.push(this.currentTransform.clone());
  
           if (this.gl.isEnabled(this.gl.SCISSOR_TEST)) {
             // FIXME avoid slice and object realloc
             this._scissorStack.push(this.currentScissor.slice());
           }
         }
docs: saves the canvas context
  @name save
  @memberOf me.WebGLRenderer.prototype
  @function