WebGPU: GTAO is incompatible with logarithmicDepthBuffer

[ligaofeng0901]

Description

https://threejs.org/examples/?q=ao#webgpu_postprocessing_ao
In this example, if logarithmicDepthBuffer is true, it's broken. The error message is below:

Depth stencil state is not present when fragment stage ([ShaderModule "fragment"], [EntryPoint "main"]) is writing to frag_depth.
 - While validating fragment state.
 - While calling [Device].CreateRenderPipeline([RenderPipelineDescriptor "renderPipeline_GTAO_20"]).

Reproduction steps

Code

renderer = new THREE.WebGPURenderer({
	logarithmicDepthBuffer: true,
});

Live example

• jsfiddle-latest-release WebGLRenderer
• jsfiddle-dev WebGLRenderer
• jsfiddle-latest-release WebGPURenderer
• jsfiddle-dev WebGPURenderer

Screenshots

No response

Version

0.170.0

Device

Desktop

Browser

No response

OS

No response

[ligaofeng0901]

I've found the relevant code of this issue
https://github.com/mrdoob/three.js/blob/dev/examples/jsm/tsl/display/GTAONode.js#L37
If the depth buffer of any render target is disabled, the error occurs, even if in post processing.

[Mugen87]

#29799 should fix the warning, however, the AO does not look right yet. Probably because the depth values differ compared to the normal depth buffer.

Related: #29447 (comment)