shader_prepass example is broken

[rparrett]

Bevy version

first bad commit is c3a4682

Relevant system information

AdapterInfo { name: "Apple M1 Max", vendor: 0, device: 0, device_type: IntegratedGpu, driver: "", driver_info: "", backend: Metal }
SystemInfo { os: "MacOS 13.1 ", kernel: "22.2.0", cpu: "Apple M1 Max", core_count: "10", memory: "64.0 GiB" }

What you did

• cargo run --example shader_prepass
• press space bar

What went wrong

Depth information in grayscale should be shown, but it's just a black screen.

There's some error output:

2023-01-26T21:15:17.623605Z ERROR bevy_render::render_resource::pipeline_cache: failed to process shader:
error: expected constant, found '#'
   ┌─ wgsl:38:41
   │
38 │     cascades: array<DirectionalCascade, #{MAX_CASCADES_PER_LIGHT}>,
   │                                         ^ expected constant


2023-01-26T21:15:17.842460Z ERROR bevy_render::render_resource::pipeline_cache: failed to process shader:
error: expected constant, found '#'
   ┌─ wgsl:38:41
   │
38 │     cascades: array<DirectionalCascade, #{MAX_CASCADES_PER_LIGHT}>,
   │                                         ^ expected constant

[JMS55]

CC @IceSentry

[Elabajaba]

Copying my answer from the wgpu 0.15 pr

Looks like the cascaded shadow maps (CSM) PR probably broke both of them, as I'm now getting failures when running those examples after rebasing on main with CSM.

#6997 is a bit of a bodge and needs to be updated for CSM, but should fix them. #5703 is probably the better fix, but might not land in time for the next bevy release?

[hymm]

the post_processing example is broken too with the same error.