Renderer: Document more modules.

src/nodes/core/NodeBuilder.js

@@ -497,6 +497,15 @@ class NodeBuilder {
 
 	}
 
+	/**
+	 * Returns the output struct name which is required by
+	 * {@link module:OutputStructNode}.
+	 *
+	 * @abstract
+	 * @return {String} The name of the output struct.
+	 */
+	getOutputStructName() {}
+
 	/**
 	 * Returns a bind group for the given group name and binding.
 	 *
@@ -1034,10 +1043,11 @@ class NodeBuilder {
 	 * @param {Texture} texture - The texture.
 	 * @param {String} textureProperty - The texture property name.
 	 * @param {String} uvSnippet - Snippet defining the texture coordinates.
+	 * @param {String?} depthSnippet - Snippet defining the 0-based texture array index to sample.
 	 * @param {String} levelSnippet - Snippet defining the mip level.
 	 * @return {String} The generated shader string.
 	 */
-	generateTextureLod( /* texture, textureProperty, uvSnippet, levelSnippet */ ) {
+	generateTextureLod( /* texture, textureProperty, uvSnippet, depthSnippet, levelSnippet */ ) {
 
 		console.warn( 'Abstract function.' );
 
@@ -1211,11 +1221,11 @@ class NodeBuilder {
 	}
 
 	/**
-	 * Whether the given texture needs a conversion to working color space.
+	 * Checks if the given texture requires a manual conversion to the working color space.
 	 *
 	 * @abstract
 	 * @param {Texture} texture - The texture to check.
-	 * @return {Boolean} Whether a color space conversion is required or not.
+	 * @return {Boolean} Whether the given texture requires a conversion to working color space or not.
 	 */
 	needsToWorkingColorSpace( /*texture*/ ) {
 

src/renderers/common/Backend.js

@@ -317,15 +317,16 @@ class Backend {
 	 * Returns texture data as a typed array.
 	 *
 	 * @abstract
+	 * @async
 	 * @param {Texture} texture - The texture to copy.
 	 * @param {Number} x - The x coordinate of the copy origin.
 	 * @param {Number} y - The y coordinate of the copy origin.
 	 * @param {Number} width - The width of the copy.
 	 * @param {Number} height - The height of the copy.
 	 * @param {Number} faceIndex - The face index.
-	 * @return {TypedArray} The texture data as a typed array.
+	 * @return {Promise<TypedArray>} A Promise that resolves with a typed array when the copy operation has finished.
 	 */
-	copyTextureToBuffer( /*texture, x, y, width, height, faceIndex*/ ) {}
+	async copyTextureToBuffer( /*texture, x, y, width, height, faceIndex*/ ) {}
 
 	/**
 	 * Copies data of the given source texture to the given destination texture.

src/renderers/webgl-fallback/WebGLBackend.js

@@ -1161,15 +1161,16 @@ class WebGLBackend extends Backend {
 	/**
 	 * Returns texture data as a typed array.
 	 *
+	 * @async
 	 * @param {Texture} texture - The texture to copy.
 	 * @param {Number} x - The x coordinate of the copy origin.
 	 * @param {Number} y - The y coordinate of the copy origin.
 	 * @param {Number} width - The width of the copy.
 	 * @param {Number} height - The height of the copy.
 	 * @param {Number} faceIndex - The face index.
-	 * @return {TypedArray} The texture data as a typed array.
+	 * @return {Promise<TypedArray>} A Promise that resolves with a typed array when the copy operation has finished.
 	 */
-	copyTextureToBuffer( texture, x, y, width, height, faceIndex ) {
+	async copyTextureToBuffer( texture, x, y, width, height, faceIndex ) {
 
 		return this.textureUtils.copyTextureToBuffer( texture, x, y, width, height, faceIndex );