code: function( background, sprites, priorities ) {
  		this.bgBuffer.set( background, this.index );
  		this.spriteBuffer.set( sprites, this.index );
  		this.prioBuffer.set( priorities, this.index );
  		this.index += 256;
  	}
docs: Output a scanline.
  @param {Uint8Array} background - Scanline background buffer
  @param {Uint8Array} sprites - Scanline sprite buffer
  @param {Uint8Array} priorities - Scanline sprite priority buffer