Method bindShader

src/webgl/p5.Shader.js:796–808

* initializes (if needed) and binds the shader program. * @private

(shaderType, options)

   * @private
   */
  bindShader(shaderType, options) {
    if (this.shaderType && this.shaderType !== shaderType) {
      throw new Error(
        `You've already used this shader as a ${this.shaderType} shader, but are now using it as a ${shaderType}.`
      );
    }
    this.shaderType = shaderType;
    this.init();
    if (!this._bound) {
      this.useProgram(options);
      this._bound = true;
    }
  }

  /**
   * @chainable