Frustum: Support reversed depth in setFromProjectionMatrix()

[WestLangley]

As the title says.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	338.22 78.88	338.22 78.88	+0 B +0 B
WebGPU	560.72 155.17	560.72 155.17	+0 B +0 B
WebGPU Nodes	559.64 154.96	559.64 154.96	+0 B +0 B

🌳 Bundle size after tree-shaking

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

	Before	After	Diff
WebGL	469.49 113.56	469.6 113.58	+103 B +20 B
WebGPU	635.72 172.04	635.83 172.07	+103 B +26 B
WebGPU Nodes	590.37 161.29	590.47 161.31	+103 B +19 B

[WestLangley]

@Mugen87 FYI. Camera.reversedDepth can be set lazily by the renderer, but it has to be set before Frustum.setFromProjectionMatrix() is called, and that is currently a problem...

[Mugen87]

Can't you just pass in the reversedDepthBuffer flag from the renderer when setFromProjectionMatrix() is called?

[WestLangley]

Can't you just pass in the reversedDepthBuffer flag from the renderer when setFromProjectionMatrix() is called?

I don't think the renderer is accessible when the method is called...

[Mugen87]

The light shadow classes could access the renderer if the shadow map module passes its reference to updateMatrices().

FrustumArray is used in context of BatchedMesh which could pass the renderer reference in its onBeforeRender() callback.

AFAICS, with a bit of refactoring, it should be possible to just work with reversedDepthBuffer.

[WestLangley]

TBH, I'd appreciate it if this can be merged so we can get to the point where reverse depth is working correctly. There were so many bugs to address.

I'll be glad to help with a refactoring once this settles down.

Oh, remember, we still have to get reverse depth working for WebGPURenderer.

[Mugen87]

Sorry, my intent was not to block the PR. If we passing the reversed depth buffer boolean from Camera or WebGLRenderer can be implemented at a later point.

I would wait with WebGPURenderer support until the implementation in WebGLRenderer is more stable so we confident the decided approaches work in production.