WebGPURenderer with WebGPU Backend: Clear color is not set correctly

[WestLangley]

Description

Clear Color is not set correctly when clear alpha < 1.

Compare WebGPURenderer with both WebGLRenderer and WebGPURenderer/WebGLBackend. The latter two appear to render the same, and I think they are correct.

Reproduction steps

Set clear alpha to less than 1.

Code

See fiddles.

Live example

WebGLRenderer (dev): https://jsfiddle.net/ofyu03vc/

WebGPURenderer (dev): https://jsfiddle.net/fbk0d8s9/

Screenshots

No response

Version

r169dev

Device

Desktop

Browser

Chrome

OS

MacOS

[Mugen87]

With THREE.LinearSRGBColorSpace as output color space the fiddles look identical now:

WebGLRenderer: https://jsfiddle.net/ek84jq9v/
WebGPURenderer: https://jsfiddle.net/mpvb8agu/

Because of #29538 (comment), I would say the WebGPURenderer result is actually the correct one and the issue can be closed.

[WestLangley]

I am not sure that comment is correct... gl.clear() copies the clear color into the buffer; there is no blending involved.