import THREE from 'three'

/**
 * @author alteredq / http://alteredqualia.com/
 */

THREE.RenderPass = function ( scene, camera, overrideMaterial, clearColor, clearAlpha ) {

  this.scene = scene;
  this.camera = camera;

  this.overrideMaterial = overrideMaterial;

  this.clearColor = clearColor;
  this.clearAlpha = ( clearAlpha !== undefined ) ? clearAlpha : 1;

  this.oldClearColor = new THREE.Color();
  this.oldClearAlpha = 1;

  this.enabled = true;
  this.clear = true;
  this.needsSwap = false;

};

THREE.RenderPass.prototype = {

  render: function ( renderer, writeBuffer, readBuffer, delta ) {

    this.scene.overrideMaterial = this.overrideMaterial;

    if ( this.clearColor ) {

      this.oldClearColor.copy( renderer.getClearColor() );
      this.oldClearAlpha = renderer.getClearAlpha();

      renderer.setClearColor( this.clearColor, this.clearAlpha );

    }

    renderer.render( this.scene, this.camera, readBuffer, this.clear );

    if ( this.clearColor ) {

      renderer.setClearColor( this.oldClearColor, this.oldClearAlpha );

    }

    this.scene.overrideMaterial = null;

  }

};

export default THREE.RenderPass;