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

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

    THREE.Pass.call(this);

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

    this.overrideMaterial = overrideMaterial;

    this.clearColor = clearColor;
    this.clearAlpha = (clearAlpha !== undefined) ? clearAlpha : 0;

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

};

THREE.RenderPass.prototype = Object.assign(Object.create(THREE.Pass.prototype), {

    constructor: THREE.RenderPass,

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

        var oldAutoClear = renderer.autoClear;
        renderer.autoClear = false;

        this.scene.overrideMaterial = this.overrideMaterial;

        var oldClearColor, oldClearAlpha;

        if (this.clearColor) {

            oldClearColor = renderer.getClearColor().getHex();
            oldClearAlpha = renderer.getClearAlpha();

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

        }

        if (this.clearDepth) {

            renderer.clearDepth();

        }

        renderer.render(this.scene, this.camera, this.renderToScreen ? null : readBuffer, this.clear);

        if (this.clearColor) {

            renderer.setClearColor(oldClearColor, oldClearAlpha);

        }

        this.scene.overrideMaterial = null;
        renderer.autoClear = oldAutoClear;
    }

});