ash-molten
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🌋 Statically linked MoltenVK for Vulkan on Mac using Ash 🦀
🌋 ash-molten
ash-molten
is built on top of ash and exposes a new entry point to statically link with MoltenVK.
Requires Xcode 12 and Mac OS 10.15 (Catalina) to compile.
Why?
-
You want to compile down to a single binary that doesn't need any environment variables to bet set.
-
You just want to try out MoltenVK without needing to setup the SDK.
Why not?
-
ash already supports MoltenVK via runtime linking. Runtime linking is the preferred way of using Vulkan because the loader can be updated at anytime without needing to recompile.
-
ash-molten
doesn't have access to the validation layers and therefore can not output any debug information.
How?
let entry = ash_molten::MoltenEntry::load().expect("Unable to load Molten");
let app_name = CString::new("Hello Static Molten").unwrap();
let appinfo = vk::ApplicationInfo::builder()
.application_name(&app_name)
.application_version(0)
.engine_name(&app_name)
.engine_version(0)
.api_version(vk_make_version!(1, 0, 0));
let create_info = vk::InstanceCreateInfo::builder().application_info(&appinfo);
let instance = entry.create_instance(&create_info, None).expect("Instance");
let devices = instance.enumerate_physical_devices();
println!("{:?}", devices);
You can run the example with cargo run
.
How does it work?
ash-molten
links statically with MoltenVK, it then uses vkGetInstanceProcAddr
to resolve all the function pointers at runtime.
Features
cargo build
will clone a specific release of MoltenVK compile and statically link it with your application.
cargo build --features pre-built
will download a pre-built version of MoltenVK from a release of ash-molten.
cargo build --features external
provide own MoltenVK library.
If you want to compile MoltenVK yourself, you can use the external
feature. cargo build --features external
requires libMoltenVK
to be visible (LD_LIBRARY_PATH
).
How to update
To update the version of MoltenVK uses, change the following:
- In
build.rs
, changestatic VERSION = "1.1.0"
to the new MoltenVK release tag name - Update the crate version in
Cargo.toml
- Bump the patch version
- Set the version metadata to the MoltenVK release.
- E.g.
0.2.0+1.1.9
->0.2.1+1.1.10
.
- Before you can submit the PR, you must also update the prebuilt version. See the next section.
Updating pre-built version
To update the prebuilt version of MoltenVK that ash-molten uses, change the following:
- Follow the steps mentioned above.
- Download the MoltenVK XCFramework from, for example, the Vulkan SDK for Mac or build MoltenVK yourself.
- in the case of downloading it from an external source make sure MoltenVK version matches
static VERSION
.
- in the case of downloading it from an external source make sure MoltenVK version matches
- From the XCFramework folder, from the built version of MoltenVK, zip the folders of platforms that need to be supported individually.
- Create a release with the tag: MoltenVK-{version number}.
- Upload the zip files to the release with the MoltenVK-{version number} tag.
Contributing
We welcome community contributions to this project.
Please read our Contributor Guide for more information on how to get started.
License
Licensed under either of
- Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
- MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)
at your option.
Contribution
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.