@phaserjs/phaser/math/mat4/Mat4PerspectiveFromFieldOfView.js

Phaser 4

import { Matrix4 } from "./Matrix4";
export function Mat4PerspectiveFromFieldOfView(fov, near, far, out = new Matrix4()) {
  const upTan = Math.tan(fov.upDegrees * Math.PI / 180);
  const downTan = Math.tan(fov.downDegrees * Math.PI / 180);
  const leftTan = Math.tan(fov.leftDegrees * Math.PI / 180);
  const rightTan = Math.tan(fov.rightDegrees * Math.PI / 180);
  const xScale = 2 / (leftTan + rightTan);
  const yScale = 2 / (upTan + downTan);
  return out.set(xScale, 0, 0, 0, 0, yScale, 0, 0, -((leftTan - rightTan) * xScale * 0.5), (upTan - downTan) * yScale * 0.5, far / (near - far), -1, 0, 0, far * near / (near - far), 0);
}