docs: function TiltShiftAxisFilter()
  {
      core.AbstractFilter.call(this,
          // vertex shader
          null,
          // fragment shader
          fs.readFileSync(__dirname + '/tiltShift.frag', 'utf8'),
          // custom uniforms
          {
              blur:           { type: '1f', value: 100 },
              gradientBlur:   { type: '1f', value: 600 },
              start:          { type: 'v2', value: { x: 0,    y: window.innerHeight / 2 } },
              end:            { type: 'v2', value: { x: 600,  y: window.innerHeight / 2 } },
              delta:          { type: 'v2', value: { x: 30,   y: 30 } },
              texSize:        { type: 'v2', value: { x: window.innerWidth, y: window.innerHeight } }
          }
      );
  
      this.updateDelta();
  }