support multiple screen canvas targets

examples/files.json

@@ -351,6 +351,7 @@
 		"webgpu_materials_toon",
 		"webgpu_materials_video",
 		"webgpu_materialx_noise",
+		"webgpu_multiple_canvases",
 		"webgpu_multiple_rendertargets",
 		"webgpu_multiple_rendertargets_readback",
 		"webgpu_morphtargets",

examples/jsm/nodes/display/PassNode.js

@@ -133,9 +133,9 @@ class PassNode extends TempNode {
 		const { renderer } = frame;
 		const { scene, camera } = this;
 
-		this._pixelRatio = renderer.getPixelRatio();
+		this._pixelRatio = renderer.getActivePixelRatio();
 
-		const size = renderer.getSize( new Vector2() );
+		const size = renderer.getActiveSize( new Vector2() );
 
 		this.setSize( size.width, size.height );
 

examples/jsm/nodes/display/ViewportNode.js

@@ -47,11 +47,11 @@ class ViewportNode extends Node {
 
 		if ( this.scope === ViewportNode.VIEWPORT ) {
 
-			renderer.getViewport( viewportResult );
+			renderer.getActiveViewport( viewportResult );
 
 		} else {
 
-			renderer.getDrawingBufferSize( resolution );
+			renderer.getActiveDrawingBufferSize( resolution );
 
 		}
 

examples/jsm/nodes/display/ViewportTextureNode.js

@@ -31,7 +31,7 @@ class ViewportTextureNode extends TextureNode {
 	updateBefore( frame ) {
 
 		const renderer = frame.renderer;
-		renderer.getDrawingBufferSize( _size );
+		renderer.getActiveDrawingBufferSize( _size );
 
 		//
 

examples/jsm/nodes/utils/ReflectorNode.js

@@ -55,7 +55,7 @@ class ReflectorNode extends TextureNode {
 
 		const resolution = this.resolution;
 
-		renderer.getDrawingBufferSize( _size );
+		renderer.getActiveDrawingBufferSize( _size );
 
 		renderTarget.setSize( Math.round( _size.width * resolution ), Math.round( _size.height * resolution ) );
 
@@ -126,7 +126,7 @@ class ReflectorNode extends TextureNode {
 		const virtualCamera = this.getVirtualCamera( camera );
 		const renderTarget = this.getRenderTarget( virtualCamera );
 
-		renderer.getDrawingBufferSize( _size );
+		renderer.getActiveDrawingBufferSize( _size );
 
 		this._updateResolution( renderTarget, renderer );
 

examples/jsm/renderers/common/Backend.js

@@ -1,9 +1,7 @@
-let vector2 = null;
-let vector4 = null;
 let color4 = null;
 
 import Color4 from './Color4.js';
-import { Vector2, Vector4, REVISION, createCanvasElement } from 'three';
+import { REVISION, createCanvasElement } from 'three';
 
 class Backend {
 
@@ -86,8 +84,6 @@ class Backend {
 
 	getContext() { }
 
-	updateSize() { }
-
 	// utils
 
 	resolveTimestampAsync( renderContext, type ) { }
@@ -104,22 +100,6 @@ class Backend {
 
 	}
 
-	getDrawingBufferSize() {
-
-		vector2 = vector2 || new Vector2();
-
-		return this.renderer.getDrawingBufferSize( vector2 );
-
-	}
-
-	getScissor() {
-
-		vector4 = vector4 || new Vector4();
-
-		return this.renderer.getScissor( vector4 );
-
-	}
-
 	setScissorTest( boolean ) { }
 
 	getClearColor() {

examples/jsm/renderers/common/CanvasRenderTarget.js

@@ -0,0 +1,219 @@
+import { EventDispatcher, Vector4, REVISION, createCanvasElement, SRGBColorSpace } from 'three';
+
+class CanvasRenderTarget extends EventDispatcher {
+
+	constructor( parameters ) {
+
+		super();
+
+		this.isCanvasRenderTarget = true;
+
+		this.canvas = parameters.canvas;
+		this.context = parameters.context;
+		this._domElement = parameters.domElement;
+		this.alpha = ( parameters.alpha === undefined ) ? true : parameters.alpha;
+
+		this.antialias = ( parameters.antialias === true );
+
+		if ( this.antialias === true ) {
+
+			this.sampleCount = ( parameters.sampleCount === undefined ) ? 4 : parameters.sampleCount;
+
+		} else {
+
+			this.sampleCount = 1;
+
+		}
+
+		this.outputColorSpace = SRGBColorSpace;
+
+		this.depth = true;
+		this.stencil = false;
+
+		this._width = 0;
+		this._height = 0;
+		this.pixelRatio = 1;
+
+		this.viewport = new Vector4( 0, 0, this._width, this._height );
+		this.scissor = new Vector4( 0, 0, this._width, this._height );
+		this._scissorTest = false;
+
+		this.version = 0;
+
+	}
+
+	set needsUpdate( value ) {
+
+		if ( value === true ) this.version ++;
+
+	}
+
+	get domElement() {
+
+		let domElement = this._domElement;
+
+		if ( ! domElement ) {
+
+			domElement = ( this.canvas !== undefined ) ? this.canvas : createCanvasElement();
+
+			// OffscreenCanvas does not have setAttribute, see #22811
+			if ( 'setAttribute' in domElement ) domElement.setAttribute( 'data-engine', `three.js r${REVISION} webgpu` );
+
+			this._domElement = domElement;
+
+		}
+
+		return domElement;
+
+	}
+
+	get samples() {
+
+		return this.sampleCount;
+
+	}
+
+	get depthBuffer() {
+
+		return this.depth;
+
+	}
+
+	get stencilBuffer() {
+
+		return this.stencil;
+
+	}
+
+	getPixelRatio() {
+
+		return this.pixelRatio;
+
+	}
+
+	getDrawingBufferSize( target ) {
+
+		return target.set( this._width * this.pixelRatio, this._height * this.pixelRatio ).floor();
+
+	}
+
+	getSize( target ) {
+
+		return target.set( this._width, this._height );
+
+	}
+
+	setPixelRatio( value = 1 ) {
+
+		this.pixelRatio = value;
+
+		this.setSize( this._width, this._height, false );
+
+	}
+
+	setDrawingBufferSize( width, height, pixelRatio ) {
+
+		this._width = width;
+		this._height = height;
+
+		this.pixelRatio = pixelRatio;
+
+		this.domElement.width = Math.floor( width * pixelRatio );
+		this.domElement.height = Math.floor( height * pixelRatio );
+
+		this.setViewport( 0, 0, width, height );
+
+		this.needsUpdate = true;
+
+	}
+
+	setSize( width, height, updateStyle = true ) {
+
+		this._width = width;
+		this._height = height;
+
+		this.domElement.width = Math.floor( width * this.pixelRatio );
+		this.domElement.height = Math.floor( height * this.pixelRatio );
+
+		if ( updateStyle === true ) {
+
+			this.domElement.style.width = width + 'px';
+			this.domElement.style.height = height + 'px';
+
+		}
+
+		this.setViewport( 0, 0, width, height );
+
+		this.needsUpdate = true;
+
+	}
+
+	getScissor( target ) {
+
+		const scissor = this.scissor;
+
+		target.x = scissor.x;
+		target.y = scissor.y;
+		target.width = scissor.width;
+		target.height = scissor.height;
+
+		return target;
+
+	}
+
+	setScissor( x, y, width, height ) {
+
+		const scissor = this.scissor;
+
+		if ( x.isVector4 ) {
+
+			scissor.copy( x );
+
+		} else {
+
+			scissor.set( x, y, width, height );
+
+		}
+
+	}
+
+	getScissorTest() {
+
+		return this._scissorTest;
+
+	}
+
+	getViewport( target ) {
+
+		return target.copy( this.viewport );
+
+	}
+
+	setViewport( x, y, width, height, minDepth = 0, maxDepth = 1 ) {
+
+		const viewport = this.viewport;
+
+		if ( x.isVector4 ) {
+
+			viewport.copy( x );
+
+		} else {
+
+			viewport.set( x, y, width, height );
+
+		}
+
+		viewport.minDepth = minDepth;
+		viewport.maxDepth = maxDepth;
+
+	}
+
+	dispose() {
+
+		this.dispatchEvent( { type: 'dispose' } );
+
+	}
+
+}
+
+export default CanvasRenderTarget;

examples/jsm/renderers/common/RenderContexts.js

@@ -9,15 +9,15 @@ class RenderContexts {
 
 	}
 
-	get( scene, camera, renderTarget = null ) {
+	get( scene, camera, renderTarget ) {
 
 		const chainKey = [ scene, camera ];
 
 		let attachmentState;
 
-		if ( renderTarget === null ) {
+		if ( renderTarget.isCanvasRenderTarget ) {
 
-			attachmentState = 'default';
+			attachmentState = `${ renderTarget.samples }:${ renderTarget.depth }:${ renderTarget.stencil }`;
 
 		} else {
 
@@ -38,9 +38,11 @@ class RenderContexts {
 
 			chainMap.set( chainKey, renderState );
 
-		}
+			renderState.sampleCount = renderTarget.samples === 0 ? 1 : renderTarget.samples;
+			renderState.depth = renderTarget.depthBuffer;
+			renderState.stencil = renderTarget.stencilBuffer;
 
-		if ( renderTarget !== null ) renderState.sampleCount = renderTarget.samples === 0 ? 1 : renderTarget.samples;
+		}
 
 		return renderState;