WebGPUTextureUtils: Fix readback buffer size. (#31765)

Mugen87 · web-flow · commit cf60b969c46b · 2025-08-28T10:50:39.000+02:00
diff --git a/src/renderers/webgpu/utils/WebGPUTextureUtils.js b/src/renderers/webgpu/utils/WebGPUTextureUtils.js
@@ -540,7 +540,7 @@ class WebGPUTextureUtils {
 
 		const readBuffer = device.createBuffer(
 			{
-				size: width * height * bytesPerTexel,
+				size: ( height - 1 ) * bytesPerRow + width * bytesPerTexel, // see https://github.com/mrdoob/three.js/issues/31658#issuecomment-3229442010
 				usage: GPUBufferUsage.COPY_DST | GPUBufferUsage.MAP_READ
 			}
 		);

Original file line number	Diff line number	Diff line change
`@@ -540,7 +540,7 @@ class WebGPUTextureUtils {`
`540`	`540`
`541`	`541`	`const readBuffer = device.createBuffer(`
`542`	`542`	`{`
`543`		`- size: width * height * bytesPerTexel,`
	`543`	`+ size: ( height - 1 ) * bytesPerRow + width * bytesPerTexel, // see https://github.com/mrdoob/three.js/issues/31658#issuecomment-3229442010`
`544`	`544`	`usage: GPUBufferUsage.COPY_DST \| GPUBufferUsage.MAP_READ`
`545`	`545`	`}`
`546`	`546`	`);`