backend/libs/three/renderers/WebGLMultipleRenderTargets.js

import { WebGLRenderTarget } from './WebGLRenderTarget.js';

class WebGLMultipleRenderTargets extends WebGLRenderTarget {
	constructor(width, height, count) {
		super(width, height);

		const texture = this.texture;

		this.texture = [];

		for (let i = 0; i < count; i++) {
			this.texture[i] = texture.clone();
		}
	}

	setSize(width, height, depth = 1) {
		if (this.width !== width || this.height !== height || this.depth !== depth) {
			this.width = width;
			this.height = height;
			this.depth = depth;

			for (let i = 0, il = this.texture.length; i < il; i++) {
				this.texture[i].image.width = width;
				this.texture[i].image.height = height;
				this.texture[i].image.depth = depth;
			}

			this.dispose();
		}

		this.viewport.set(0, 0, width, height);
		this.scissor.set(0, 0, width, height);

		return this;
	}

	copy(source) {
		this.dispose();

		this.width = source.width;
		this.height = source.height;
		this.depth = source.depth;

		this.viewport.set(0, 0, this.width, this.height);
		this.scissor.set(0, 0, this.width, this.height);

		this.depthBuffer = source.depthBuffer;
		this.stencilBuffer = source.stencilBuffer;
		this.depthTexture = source.depthTexture;

		this.texture.length = 0;

		for (let i = 0, il = source.texture.length; i < il; i++) {
			this.texture[i] = source.texture[i].clone();
		}

		return this;
	}
}

WebGLMultipleRenderTargets.prototype.isWebGLMultipleRenderTargets = true;

export { WebGLMultipleRenderTargets };