Function mask

test/unit/webgl/p5.RendererGL.js:2534–2541

()

    test('It can mask in a shape', function() {
      const mask = () => {
        myp5.background(255);
        myp5.noStroke();
        myp5.clip(() => myp5.rect(10, 10, 30, 30));
        myp5.fill('red');
        myp5.rect(5, 5, 40, 40);
        // console.log(myp5._renderer.canvas.toDataURL());
      };
      const pixels = getClippedPixels(myp5.WEBGL, mask);

      // Regions where nothing is drawn should be white