( function () {

class ClearPass extends THREE.Pass {

constructor( clearColor, clearAlpha ) {

super();

this.needsSwap = false;

this.clearColor = clearColor !== undefined ? clearColor : 0x000000;

this.clearAlpha = clearAlpha !== undefined ? clearAlpha : 0;

this._oldClearColor = new THREE.Color();

}

render( renderer, writeBuffer, readBuffer

/*, deltaTime, maskActive */

) {

let oldClearAlpha;

if ( this.clearColor ) {

renderer.getClearColor( this._oldClearColor );

oldClearAlpha = renderer.getClearAlpha();

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

}

renderer.setRenderTarget( this.renderToScreen ? null : readBuffer );

renderer.clear();

if ( this.clearColor ) {

renderer.setClearColor( this._oldClearColor, oldClearAlpha );

}

}

}

THREE.ClearPass = ClearPass;

} )();