render( renderer, writeBuffer, readBuffer, deltaTime /*, maskActive */ ) {

		this.uniforms[ 'tDiffuse' ].value = readBuffer.texture;
		this.uniforms[ 'time' ].value += deltaTime;

		if ( this.renderToScreen ) {

			renderer.setRenderTarget( null );
			this._fsQuad.render( renderer );

		} else {

			renderer.setRenderTarget( writeBuffer );
			if ( this.clear ) renderer.clear();
			this._fsQuad.render( renderer );

		}

	}
Performs the film pass.

@param {WebGLRenderer} renderer - The renderer.
@param {WebGLRenderTarget} writeBuffer - The write buffer. This buffer is intended as the rendering
destination for the pass.
@param {WebGLRenderTarget} readBuffer - The read buffer. The pass can access the result from the
previous pass from this buffer.
@param {number} deltaTime - The delta time in seconds.
@param {boolean} maskActive - Whether masking is active or not.