Method clear

src/webgl/p5.RendererGL.js:626–650

* clears color and depth buffers * with r,g,b,a * @private * @param {Number} r normalized red val. * @param {Number} g normalized green val. * @param {Number} b normalized blue val. * @param {Number} a normalized alpha val.

(...args)

   * @param {Number} a normalized alpha val.
   */
  clear(...args) {
    const _r = args[0] || 0;
    const _g = args[1] || 0;
    const _b = args[2] || 0;
    let _a = args[3] || 0;

    const activeFramebuffer = this.activeFramebuffer();
    if (
      activeFramebuffer &&
      activeFramebuffer.format === constants.UNSIGNED_BYTE &&
      !activeFramebuffer.antialias &&
      _a === 0
    ) {
      // Drivers on Intel Macs check for 0,0,0,0 exactly when drawing to a
      // framebuffer and ignore the command if it's the only drawing command to
      // the framebuffer. To work around it, we can set the alpha to a value so
      // low that it still rounds down to 0, but that circumvents the buggy
      // check in the driver.
      _a = 1e-10;
    }

    this.GL.clearColor(_r * _a, _g * _a, _b * _a, _a);
    this.GL.clearDepth(1);
    this.GL.clear(this.GL.COLOR_BUFFER_BIT | this.GL.DEPTH_BUFFER_BIT);
  }

  /**
   * Resets all depth information so that nothing previously drawn will