enable partial bindless support on metal

[mockersf]

What problem does this solve or what need does it fill?

Metal support some of the features for bindless, and could benefit from it

What solution would you like?

what I mean is that bindless is currently disabled unconditionally unless your platform supports bindless textures, bindless samplers, and bindless buffers. Metal supports the first two but not the last one. However, the last one is not necessary for StandardMaterial if you have flat buffers. So we don't actually need to disable bindless on Metal in most cases.

https://discord.com/channels/691052431525675048/743663924229963868/1346051575306780733

[mate-h]

While investigating bindless support on Metal, I found what appears to be a separate but related issue:

When trying to use texture binding arrays for environment maps (which should be supported on Metal), the shader compilation fails (in the defferred and SSR examples). Interestingly the Texture Binding Array example works.

ERROR: mapping of ResourceBinding { group: 0, binding: 17 } is missing
In Device::create_render_pipeline, label = 'deferred_lighting_pipeline'

While the original issue describes Metal's partial bindless support, the issue I am describing is a bug in wgpu's Metal backend handling of texture binding arrays. Both issues need to be addressed to fully support bindless features on Metal.

gfx-rs/wgpu#3637

cc: @cwfitzgerald @Elabajaba

[colepoirier]

I get this issue running the ssr example on macos on main (crashes) but running off the 0.15.3 tag the example runs flawlessly.

     Running `target/fast-dev/examples/ssr`
2025-03-04T06:03:30.313674Z  INFO bevy_diagnostic::system_information_diagnostics_plugin::internal: SystemInfo { os: "macOS 15.3.1 Sequoia", kernel: "24.3.0", cpu: "Apple M2", core_count: "8", memory: "16.0 GiB" }    
2025-03-04T06:03:30.722464Z  INFO bevy_render::renderer: AdapterInfo { name: "Apple M2", vendor: 0, device: 0, device_type: IntegratedGpu, driver: "", driver_info: "", backend: Metal }
2025-03-04T06:03:31.006153Z  INFO bevy_winit::system: Creating new window Bevy Screen Space Reflections Example (0v1)
2025-03-03 22:03:31.093 ssr[47156:1127900] +[IMKClient subclass]: chose IMKClient_Modern
2025-03-03 22:03:31.093 ssr[47156:1127900] +[IMKInputSession subclass]: chose IMKInputSession_Modern
2025-03-04T06:03:34.668222Z ERROR wgpu::backend::wgpu_core: Shader translation error for stage ShaderStages(FRAGMENT): mapping of ResourceBinding { group: 0, binding: 17 } is missing    
2025-03-04T06:03:34.668235Z ERROR wgpu::backend::wgpu_core: Please report it to https://github.com/gfx-rs/wgpu    
2025-03-04T06:03:34.668243Z ERROR wgpu::backend::wgpu_core: Handling wgpu errors as fatal by default    

thread 'Compute Task Pool (1)' panicked at /Users/colepoirier/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/wgpu-24.0.1/src/backend/wgpu_core.rs:1303:26:
wgpu error: Validation Error

Caused by:
  In Device::create_render_pipeline, label = 'deferred_lighting_pipeline'
    Internal error in ShaderStages(FRAGMENT) shader: mapping of ResourceBinding { group: 0, binding: 17 } is missing


note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
Encountered a panic in system `bevy_render::render_resource::pipeline_cache::PipelineCache::process_pipeline_queue_system`!

thread '<unnamed>' panicked at /Users/colepoirier/bld/bevy/crates/bevy_render/src/render_resource/pipeline_cache.rs:589:28:
index out of bounds: the len is 0 but the index is 22
Encountered a panic in system `bevy_render::renderer::render_system`!

[tychedelia]

Pulling this from the release as I don't think anyone will get to this in time. Called it out in rendering-dev in case anyone want to pick it up.