function preload() {

  fontRegular = loadFont('assets/Regular.otf');

  fontItalic = loadFont('assets/Italic.ttf');

  fontBold = loadFont('assets/Bold.ttf');

}

function setup() {

  background(210);

  fill(0)

   .strokeWeight(0)

   .textSize(10);

  textFont(fontRegular);

  text('Font Style Normal', 10, 30);

  textFont(fontItalic);

  text('Font Style Italic', 10, 50);

  textFont(fontBold);

  text('Font Style Bold', 10, 70);

}