Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 86 insertions, 0 deletions

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+# Naga
+
+[![Matrix](https://img.shields.io/badge/Matrix-%23naga%3Amatrix.org-blueviolet.svg)](https://matrix.to/#/#naga:matrix.org)
+[![Crates.io](https://img.shields.io/crates/v/naga.svg?label=naga)](https://crates.io/crates/naga)
+[![Docs.rs](https://docs.rs/naga/badge.svg)](https://docs.rs/naga)
+[![Build Status](https://github.com/gfx-rs/naga/workflows/pipeline/badge.svg)](https://github.com/gfx-rs/naga/actions)
+![MSRV](https://img.shields.io/badge/rustc-1.70+-blue.svg)
+[![codecov.io](https://codecov.io/gh/gfx-rs/naga/branch/master/graph/badge.svg?token=9VOKYO8BM2)](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 testing 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:
+```bash
+cargo xtask validate spv # for Vulkan shaders, requires SPIRV-Tools installed
+cargo xtask validate msl # for Metal shaders, requires XCode command-line tools installed
+cargo xtask validate glsl # for OpenGL shaders, requires GLSLang installed
+cargo xtask validate dot # for dot files, requires GraphViz installed
+cargo xtask validate wgsl # for WGSL shaders
+cargo xtask validate hlsl dxc # for HLSL shaders via DXC
+cargo xtask validate hlsl fxc # for HLSL shaders via FXC
+```