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diff --git a/third_party/rust/naga/README.md b/third_party/rust/naga/README.md new file mode 100644 index 0000000000..0de0cd61bb --- /dev/null +++ b/third_party/rust/naga/README.md @@ -0,0 +1,87 @@ +# Naga + +[](https://matrix.to/#/#naga:matrix.org) +[](https://crates.io/crates/naga) +[](https://docs.rs/naga) +[](https://github.com/gfx-rs/naga/actions) + +[](https://codecov.io/gh/gfx-rs/naga) + +The shader translation library for the needs of [wgpu](https://github.com/gfx-rs/wgpu). + +## Supported end-points + +Front-end | Status | Feature | Notes | +--------------- | ------------------ | ------- | ----- | +SPIR-V (binary) | :white_check_mark: | spv-in | | +WGSL | :white_check_mark: | wgsl-in | Fully validated | +GLSL | :ok: | glsl-in | GLSL 440+ and Vulkan semantics only | + +Back-end | Status | Feature | Notes | +--------------- | ------------------ | -------- | ----- | +SPIR-V | :white_check_mark: | spv-out | | +WGSL | :ok: | wgsl-out | | +Metal | :white_check_mark: | msl-out | | +HLSL | :white_check_mark: | hlsl-out | Shader Model 5.0+ (DirectX 11+) | +GLSL | :ok: | glsl-out | GLSL 330+ and GLSL ES 300+ | +AIR | | | | +DXIL/DXIR | | | | +DXBC | | | | +DOT (GraphViz) | :ok: | dot-out | Not a shading language | + +:white_check_mark: = Primary support — :ok: = Secondary support — :construction: = Unsupported, but support in progress + +## Conversion tool + +Naga can be used as a CLI, which allows to test the conversion of different code paths. + +First, install `naga-cli` from crates.io or directly from GitHub. + +```bash +# release version +cargo install naga-cli + +# development version +cargo install naga-cli --git https://github.com/gfx-rs/naga.git +``` + +Then, you can run `naga` command. + +```bash +naga my_shader.wgsl # validate only +naga my_shader.spv my_shader.txt # dump the IR module into a file +naga my_shader.spv my_shader.metal --flow-dir flow-dir # convert the SPV to Metal, also dump the SPIR-V flow graph to `flow-dir` +naga my_shader.wgsl my_shader.vert --profile es310 # convert the WGSL to GLSL vertex stage under ES 3.20 profile +``` + +As naga includes a default binary target, you can also use `cargo run` without installation. This is useful when you develop naga itself, or investigate the behavior of naga at a specific commit (e.g. [wgpu](https://github.com/gfx-rs/wgpu) might pin a different version of naga than the `HEAD` of this repository). + +```bash +cargo run my_shader.wgsl +``` + +## Development workflow + +The main instrument aiding the development is the good old `cargo test --all-features --workspace`, +which will run the unit tests, and also update all the snapshots. You'll see these +changes in git before committing the code. + +If working on a particular front-end or back-end, it may be convenient to +enable the relevant features in `Cargo.toml`, e.g. +```toml +default = ["spv-out"] #TEMP! +``` +This allows IDE basic checks to report errors there, unless your IDE is sufficiently configurable already. + +Finally, when changes to the snapshots are made, we should verify that the produced shaders +are indeed valid for the target platforms they are compiled for. We automate this with `Makefile`: +```bash +make validate-spv # for Vulkan shaders, requires SPIRV-Tools installed +make validate-msl # for Metal shaders, requires XCode command-line tools installed +make validate-glsl # for OpenGL shaders, requires GLSLang installed +make validate-dot # for dot files, requires GraphViz installed +make validate-wgsl # for WGSL shaders +make validate-hlsl-dxc # for HLSL shaders via DXC +make validate-hlsl-fxc # for HLSL shaders via FXC +# Note: HLSL Make targets make use of the "sh" shell. This is not the default shell in Windows. +``` |