Renderer: Fix transmission flicker. (#32043)

src/renderers/webgpu/WebGPUBackend.js

@@ -777,8 +777,7 @@ class WebGPUBackend extends Backend {
 
 			if ( renderContext.scissor ) {
 
-				const { x, y, width, height } = renderContext.scissorValue;
-				currentPass.setScissorRect( x, y, width, height );
+				this.updateScissor( renderContext );
 
 			}
 
@@ -1138,6 +1137,20 @@ class WebGPUBackend extends Backend {
 
 	}
 
+	/**
+	 * Updates the scissor with the values from the given render context.
+	 *
+	 * @param {RenderContext} renderContext - The render context.
+	 */
+	updateScissor( renderContext ) {
+
+		const { currentPass } = this.get( renderContext );
+		const { x, y, width, height } = renderContext.scissorValue;
+
+		currentPass.setScissorRect( x, y, width, height );
+
+	}
+
 	/**
 	 * Returns the clear color and alpha into a single
 	 * color object.
@@ -2401,6 +2414,15 @@ class WebGPUBackend extends Backend {
 			]
 		);
 
+		// mipmaps must be genereated with the same encoder otherwise the copied texture data
+		// might be out-of-sync, see #31768
+
+		if ( texture.generateMipmaps ) {
+
+			this.textureUtils.generateMipmaps( texture, encoder );
+
+		}
+
 		if ( renderContextData.currentPass ) {
 
 			const { descriptor } = renderContextData;
@@ -2425,9 +2447,7 @@ class WebGPUBackend extends Backend {
 
 			if ( renderContext.scissor ) {
 
-				const { x, y, width, height } = renderContext.scissorValue;
-
-				renderContextData.currentPass.setScissorRect( x, y, width, height );
+				this.updateScissor( renderContext );
 
 			}
 
@@ -2437,12 +2457,6 @@ class WebGPUBackend extends Backend {
 
 		}
 
-		if ( texture.generateMipmaps ) {
-
-			this.textureUtils.generateMipmaps( texture );
-
-		}
-
 	}
 
 	dispose() {

src/renderers/webgpu/utils/WebGPUTexturePassUtils.js

@@ -310,29 +310,27 @@ fn main( @location( 0 ) vTex : vec2<f32> ) -> @location( 0 ) vec4<f32> {
 	 * @param {GPUTexture} textureGPU - The GPU texture object.
 	 * @param {Object} textureGPUDescriptor - The texture descriptor.
 	 * @param {number} [baseArrayLayer=0] - The index of the first array layer accessible to the texture view.
+	 * @param {?GPUCommandEncoder} [encoder=null] - An optional command encoder used to generate mipmaps.
 	 */
-	generateMipmaps( textureGPU, textureGPUDescriptor, baseArrayLayer = 0 ) {
+	generateMipmaps( textureGPU, textureGPUDescriptor, baseArrayLayer = 0, encoder = null ) {
 
 		const textureData = this.get( textureGPU );
 
-		if ( textureData.useCount === undefined ) {
+		if ( textureData.layers === undefined ) {
 
-			textureData.useCount = 0;
 			textureData.layers = [];
 
 		}
 
 		const passes = textureData.layers[ baseArrayLayer ] || this._mipmapCreateBundles( textureGPU, textureGPUDescriptor, baseArrayLayer );
 
-		const commandEncoder = this.device.createCommandEncoder( {} );
+		const commandEncoder = encoder || this.device.createCommandEncoder( { label: 'mipmapEncoder' } );
 
 		this._mipmapRunBundles( commandEncoder, passes );
 
-		this.device.queue.submit( [ commandEncoder.finish() ] );
-
-		if ( textureData.useCount !== 0 ) textureData.layers[ baseArrayLayer ] = passes;
+		if ( encoder === null ) this.device.queue.submit( [ commandEncoder.finish() ] );
 
-		textureData.useCount ++;
+		textureData.layers[ baseArrayLayer ] = passes;
 
 	}
 

src/renderers/webgpu/utils/WebGPUTextureUtils.js

@@ -344,8 +344,9 @@ class WebGPUTextureUtils {
 	 * Generates mipmaps for the given texture.
 	 *
 	 * @param {Texture} texture - The texture.
+	 * @param {?GPUCommandEncoder} [encoder=null] - An optional command encoder used to generate mipmaps.
 	 */
-	generateMipmaps( texture ) {
+	generateMipmaps( texture, encoder = null ) {
 
 		const textureData = this.backend.get( texture );
 
@@ -353,7 +354,7 @@ class WebGPUTextureUtils {
 
 			for ( let i = 0; i < 6; i ++ ) {
 
-				this._generateMipmaps( textureData.texture, textureData.textureDescriptorGPU, i );
+				this._generateMipmaps( textureData.texture, textureData.textureDescriptorGPU, i, encoder );
 
 			}
 
@@ -363,7 +364,7 @@ class WebGPUTextureUtils {
 
 			for ( let i = 0; i < depth; i ++ ) {
 
-				this._generateMipmaps( textureData.texture, textureData.textureDescriptorGPU, i );
+				this._generateMipmaps( textureData.texture, textureData.textureDescriptorGPU, i, encoder );
 
 			}
 
@@ -814,10 +815,11 @@ class WebGPUTextureUtils {
 	 * @param {GPUTexture} textureGPU - The GPU texture object.
 	 * @param {Object} textureDescriptorGPU - The texture descriptor.
 	 * @param {number} [baseArrayLayer=0] - The index of the first array layer accessible to the texture view.
+	 * @param {?GPUCommandEncoder} [encoder=null] - An optional command encoder used to generate mipmaps.
 	 */
-	_generateMipmaps( textureGPU, textureDescriptorGPU, baseArrayLayer = 0 ) {
+	_generateMipmaps( textureGPU, textureDescriptorGPU, baseArrayLayer = 0, encoder = null ) {
 
-		this._getPassUtils().generateMipmaps( textureGPU, textureDescriptorGPU, baseArrayLayer );
+		this._getPassUtils().generateMipmaps( textureGPU, textureDescriptorGPU, baseArrayLayer, encoder );
 
 	}