Add a DX12 backend option to force a certain shader model#8984
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cwfitzgerald merged 6 commits intogfx-rs:trunkfrom Feb 11, 2026
Merged
Add a DX12 backend option to force a certain shader model#8984cwfitzgerald merged 6 commits intogfx-rs:trunkfrom
cwfitzgerald merged 6 commits intogfx-rs:trunkfrom
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cwfitzgerald
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Feb 11, 2026
This was referenced Feb 13, 2026
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wgpu update for v29. I have tested on macos m1, m5, and windows. Linux testing is appreciated. - [x] before merge, naga_oil and dlss_wgpu need to be published, and the patches referencing their respective PRs removed from the workspace Cargo.toml ##### other PRs - naga_oil: bevyengine/naga_oil#134 - dlss_wgpu: bevyengine/dlss_wgpu#27 ##### Source of relevant changes - `Dx12Compiler::DynamicDxc` no longer has `max_shader_model` - gfx-rs/wgpu#8607 - `Dx12BackendOptions::force_shader_model` comes from: - gfx-rs/wgpu#8984 - Allow optional `RawDisplayHandle` in `InstanceDescriptor` - gfx-rs/wgpu#8012 - Add `GlDebugFns` option to disable OpenGL debug functions - gfx-rs/wgpu#8931 - Add a DX12 backend option to force a certain shader model - gfx-rs/wgpu#8984 - Migrate validation from maxInterStageShaderComponents to maxInterStageShaderVariables - gfx-rs/wgpu#8652 - gaps are now supported in bind group layouts - gfx-rs/wgpu#9034 - depth validation changed to option to match spec - gfx-rs/wgpu#8840 - SHADER_PRIMITIVE_INDEX is now PRIMITIVE_INDEX - gfx-rs/wgpu#9101 - Support for binding arrays of RT acceleration structures - gfx-rs/wgpu#8923 - Make HasDisplayHandle optional in WindowHandle - gfx-rs/wgpu#8782 - `QueueWriteBufferView` can no longer be dereferenced to `&mut [u8]`, so use `WriteOnly`. - gfx-rs/wgpu#9042 - ~bevy_mesh currently has an added dependency on `wgpu`, can we move `WriteOnly` to wgpu-types?~ (it is in wgpu-types now) - Change max_*_buffer_binding_size type to match WebGPU spec (u32 -> u64) - gfx-rs/wgpu#9146 - raw vulkan init `open_with_callback` takes Limits as argument now - gfx-rs/wgpu#8756 ## Known Issues There is currently one known issue with occlusion culling on macos, which we've decided to disable on macos by checking the limits we actually require. This makes it so that if wgpu releases a patch fix, bevy 0.19 users will benefit from occlusion culling re-enabling for them. <details><summary>More details</summary> On macos, the wpgu limits were changed to align with the spec and now put the early and late GPU occlusion culling `StorageBuffer` limit at 8, but we currently use 9. [Filed in wgpu repo](gfx-rs/wgpu#9287) ``` 2026-03-19T01:37:10.771117Z ERROR bevy_render::error_handler: Caught rendering error: Validation Error Caused by: In Device::create_bind_group_layout, label = 'build mesh uniforms GPU late occlusion culling bind group layout' Too many bindings of type StorageBuffers in Stage ShaderStages(COMPUTE), limit is 8, count was 9. Check the limit `max_storage_buffers_per_shader_stage` passed to `Adapter::request_device` ``` </details> solari working on wgpu 29: <img width="1282" height="752" alt="image" src="https://github.com/user-attachments/assets/4744faec-65c0-4a72-93e1-34a721fc26d8" /> --------- Co-authored-by: atlv <email@atlasdostal.com>
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Related to passthrough shaders
Description
When using passthrough shaders, you might want to use some feature like mesh shaders that is only supported on a high enough shader model. However, wgpu_hal only exposes features based on the shader model that is present, so you would still be forced to ship DXC with your app even though you don't plan on using it.
This adds an option to force a certain shader model version for feature detection. It can probably cause panics in naga when used incorrectly so it requires an unsafe token to work.
I'm open to alternative ideas, but I stand by the idea that some solution to the problem presented is necessary.
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cargo fmt.taplo format.cargo clippy --tests. If applicable, add:--target wasm32-unknown-unknowncargo xtask testto run tests.CHANGELOG.mdentry.