render( deltaTime ) {

		// deltaTime value is in seconds

		if ( deltaTime === undefined ) {

			deltaTime = this.clock.getDelta();

		}

		const currentRenderTarget = this.renderer.getRenderTarget();

		let maskActive = false;

		for ( let i = 0, il = this.passes.length; i < il; i ++ ) {

			const pass = this.passes[ i ];

			if ( pass.enabled === false ) continue;

			pass.renderToScreen = ( this.renderToScreen && this.isLastEnabledPass( i ) );
			pass.render( this.renderer, this.writeBuffer, this.readBuffer, deltaTime, maskActive );

			if ( pass.needsSwap ) {

				if ( maskActive ) {

					const context = this.renderer.getContext();
					const stencil = this.renderer.state.buffers.stencil;

					//context.stencilFunc( context.NOTEQUAL, 1, 0xffffffff );
					stencil.setFunc( context.NOTEQUAL, 1, 0xffffffff );

					this.copyPass.render( this.renderer, this.writeBuffer, this.readBuffer, deltaTime );

					//context.stencilFunc( context.EQUAL, 1, 0xffffffff );
					stencil.setFunc( context.EQUAL, 1, 0xffffffff );

				}

				this.swapBuffers();

			}

			if ( MaskPass !== undefined ) {

				if ( pass instanceof MaskPass ) {

					maskActive = true;

				} else if ( pass instanceof ClearMaskPass ) {

					maskActive = false;

				}

			}

		}

		this.renderer.setRenderTarget( currentRenderTarget );

	}
Executes all enabled post-processing passes in order to produce the final frame.

@param {number} deltaTime - The delta time in seconds. If not given, the composer computes
its own time delta value.