WebGPURenderer: Add warning when video textures with invalid color spaces are used.

[ycw]

This PR continues the work from #31534

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	338.63 79.03	338.63 79.03	+0 B +0 B
WebGPU	567.59 157	567.59 157	+0 B +0 B
WebGPU Nodes	566.2 156.75	566.2 156.75	+0 B +0 B

🌳 Bundle size after tree-shaking

Minimal build including a renderer, camera, empty scene, and dependencies.

	Before	After	Diff
WebGL	470.38 113.78	470.38 113.78	+0 B +0 B
WebGPU	639.34 173.06	639.34 173.06	+0 B +0 B
WebGPU Nodes	593.98 162.33	593.98 162.33	+0 B +0 B

[Mugen87]

How about:

console.warn( 'WebGPURenderer: VideoTexture must be used with sRGB color space.' );

[donmccurdy]

Would we not allow putting data into a video, annotated with NoColorSpace?

[Mugen87]

Not with the current implementation. The copy of video data uses copyExternalImageToTexture() and that method only support sRGB and Display-P3 data. See related PR #31416.

[donmccurdy]

I see! Ok, good to know. Hopefully something we can loosen later, but no objection to the warning in the meantime.

[donmccurdy]

Would we not allow putting data into a video, annotated with NoColorSpace?

[donmccurdy]

I think you may want to check for the sRGB transfer functions, not color space. For example Display P3 uses sRGB transfer functions, and should work fine. Example:

Suggested change

	if ( texture.isVideoTexture && texture.colorSpace !== SRGBColorSpace ) {
	if ( texture.isVideoTexture && ColorManagement.getTransfer( texture.colorSpace ) !== SRGBTransfer ) {

[ycw]

Would we not allow putting data into a video, annotated with NoColorSpace?

I initially considered this use case, so the warning only mentioned rare scenarios...