docs: function GlowFilter(distance, outerStrength, innerStrength, color, quality) {
      PIXI.Filter.call(this,
          // vertex shader
          // vertex shader
          glslify('./glow.vert'),
          // fragment shader
          glslify('./glow.frag')
              .replace(/%QUALITY_DIST%/gi, '' + (1 / quality / distance).toFixed(7))
              .replace(/%DIST%/gi, '' + distance.toFixed(7))
      );
  
      this.uniforms.distance = distance;
      this.uniforms.glowColor = new Float32Array([0, 0, 0, 1]);
  
      quality = Math.pow(quality, 1/3);
      this.quality = quality;
  
      this.uniforms.distance.value *= quality;
  
      this.color = color;
      this.outerStrength = outerStrength;
      this.innerStrength = innerStrength;
  }