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86 lines
3.6 KiB
Markdown
86 lines
3.6 KiB
Markdown
# 🌋 ash-molten
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[](https://travis-ci.com/EmbarkStudios/ash-molten)
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[](https://crates.io/crates/ash-molten)
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[](https://docs.rs/ash-molten)
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[](CODE_OF_CONDUCT.md)
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[](http://embark.games)
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`ash-molten` is built on top of [ash](https://github.com/MaikKlein/ash) and exposes a new entry point to statically link with [MoltenVK](https://github.com/KhronosGroup/MoltenVK).
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Requires Xcode 11 and Mac OS 10.15 (Catalina) to compile.
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## Why?
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* You want to compile down to a single binary that doesn't need any enviroment variables to bet set.
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* You just want to try out [MoltenVK](https://github.com/KhronosGroup/MoltenVK) without needing to setup the SDK.
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## Why not?
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* [ash](https://github.com/MaikKlein/ash) already supports [MoltenVK](https://github.com/KhronosGroup/MoltenVK) via runtime linking. Runtime linking is the prefered way of using Vulkan because the loader can be updated at anytime without needing to recompile.
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* `ash-molten` doesn't have access to the validation layers and thefore can not output any debug information.
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## How?
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```Rust
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let entry = ash_molten::MoltenEntry::load().expect("Unable to load Molten");
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let app_name = CString::new("Hello Static Molten").unwrap();
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let appinfo = vk::ApplicationInfo::builder()
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.application_name(&app_name)
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.application_version(0)
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.engine_name(&app_name)
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.engine_version(0)
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.api_version(vk_make_version!(1, 0, 0));
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let create_info = vk::InstanceCreateInfo::builder().application_info(&appinfo);
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let instance = entry.create_instance(&create_info, None).expect("Instance");
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let devices = instance.enumerate_physical_devices();
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println!("{:?}", devices);
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```
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You can run the example with `cargo run`.
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## How does it work?
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`ash-molten` links statically with [MoltenVK](https://github.com/KhronosGroup/MoltenVK), it then uses `vkGetInstanceProcAddr` to resolve all the function pointers at runtime.
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### Features
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`cargo build` will clone a specific release of [MoltenVK](https://github.com/KhronosGroup/MoltenVK) compile and statically link it with your application.
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If you want to compile [MoltenVK](https://github.com/KhronosGroup/MoltenVK) yourself, you can use the `external` feature. `cargo build --features external` requires `libMoltenVK` to be visible (`LD_LIBRARY_PATH`).
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### How to update
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To update the version of [MoltenVK](https://github.com/KhronosGroup/MoltenVK) uses, change the following:
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- In `build.rs`, change `let tag = "v1.0.37"` to the new [MoltenVK release](https://github.com/KhronosGroup/MoltenVK/releases) tag name
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- Update the crate version in `Cargo.toml`
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- Bump the patch version
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- Set the version metadata to the MoltenVK release.
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- E.g. `0.2.0+37` -> `0.2.1+38`.
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## Contributing
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We welcome community contributions to this project.
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Please read our [Contributor Guide](CONTRIBUTING.md) for more information on how to get started.
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## License
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Licensed under either of
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* Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
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* MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
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at your option.
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### Contribution
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Unless you explicitly state otherwise, any contribution intentionally
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submitted for inclusion in the work by you, as defined in the Apache-2.0
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license, shall be dual licensed as above, without any additional terms or
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conditions.
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