MRTNode: Allow clear colors per attachment

types/three/src/nodes/core/MRTNode.d.ts

@@ -1,4 +1,6 @@
+import { ColorRepresentation } from "../../math/Color.js";
 import BlendMode from "../../renderers/common/BlendMode.js";
+import Color4 from "../../renderers/common/Color4.js";
 import { Texture } from "../../textures/Texture.js";
 import { Node } from "../Nodes.js";
 import OutputStructNode from "./OutputStructNode.js";
@@ -10,6 +12,8 @@ declare class MRTNode extends OutputStructNode {
 
     blendModes: { [name: string]: BlendMode };
 
+    clearColors: { [name: string]: Color4 };
+
     readonly isMRTNode: true;
 
     constructor(outputNodes: { [name: string]: Node });
@@ -18,6 +22,10 @@ declare class MRTNode extends OutputStructNode {
 
     getBlendMode(name: string): BlendMode;
 
+    setClearColor(name: string, color: ColorRepresentation, alpha?: number): this;
+
+    getClearColor(name: string): Color4 | null;
+
     has(name: string): boolean;
 
     get: (name: string) => Node;

types/three/src/renderers/common/Color4.d.ts

@@ -0,0 +1,53 @@
+import { Color, ColorRepresentation } from "../../math/Color.js";
+
+/**
+ * A four-component version of {@link Color} which is internally
+ * used by the renderer to represents clear color with alpha as
+ * one object.
+ *
+ * @private
+ */
+declare class Color4 extends Color {
+    /**
+     * The alpha value.
+     */
+    a: number;
+
+    /**
+     * Constructs a new four-component color.
+     * You can also pass a single THREE.Color, hex or
+     * string argument to this constructor.
+     *
+     * @param r - The red value.
+     * @param g - The green value.
+     * @param b - The blue value.
+     * @param a - The alpha value.
+     */
+    constructor(r?: ColorRepresentation, g?: number, b?: number, a?: number);
+
+    /**
+     * Overwrites the default to honor alpha.
+     * You can also pass a single THREE.Color, hex or
+     * string argument to this method.
+     */
+    set(...args: [color: ColorRepresentation] | [r: number, g: number, b: number, a?: number]): this;
+
+    /**
+     * Overwrites the default to honor alpha.
+     *
+     * @param color - The color to copy.
+     * @return A reference to this object.
+     */
+    copy(color: Color4): this;
+
+    /**
+     * Overwrites the default to honor alpha.
+     *
+     * @return The cloned color.
+     */
+    clone(): this;
+
+    [Symbol.iterator](): Generator<number, void>;
+}
+
+export default Color4;