linebender/vello

## Platforms ### Web Because Vello relies heavily on compute shaders, we rely on the emerging WebGPU standard to run on the web. Browser support for WebGPU is still evolving. Vello has been tested using production versions of Chrome, but WebGPU support in Firefox and Safari is still experimental. It may be necessary to use development browsers and explicitly enable WebGPU. The following command builds and runs a web version of the [winit demo](#winit). This uses [`cargo-run-wasm`](https://github.com/rukai/cargo-run-wasm) to build the example for web, and host a local server for it # Make sure the Rust toolchain supports the wasm32 target rustup target add wasm32-unknown-unknown # The binary name must also be explicitly provided as it differs from the package name cargo run_wasm -p with_winit --bin with_winit_bin There is also a web demo [available here](https://linebender.github.io/vello) on supporting web browsers. ### Android The [`with_winit`](#winit) example supports running on Android, using [cargo apk](https://crates.io/crates/cargo-apk). cargo apk run -p with_winit --lib [package.metadata.android.signing.release] path = "$HOME/.android/debug.keystore" keystore_password = "android" For example (with unix shell environment variable syntax): VELLO_STATIC_LOG="vello=trace" VELLO_STATIC_ARGS="--test-scenes" cargo apk run -p with_winit --lib ## Minimum supported Rust Version (MSRV) This version of Vello has been verified to compile with **Rust 1.88** and later. Future versions of Vello might increase the Rust version requirement. It will not be treated as a breaking change and as such can even happen with small patch releases.

Click here if compiling fails.

As time has passed, some of Vello's dependencies could have released versions with a higher Rust requirement. If you encounter a compilation issue due to a dependency and don't want to upgrade your Rust toolchain, then you could downgrade the dependency. # Use the problematic dependency's name and version cargo update -p package_name --precise 0.1.1

## History Vello was previously known as `piet-gpu`. This prior incarnation used a custom cross-API hardware abstraction layer, called `piet-gpu-hal`, instead of [`wgpu`]. An archive of this version can be found in the branches [`custom-hal-archive-with-shaders`] and [`custom-hal-archive`]. This succeeded the previous prototype, [piet-metal], and included work adapted from [piet-dx12]. The decision to lay down `piet-gpu-hal` in favor of WebGPU is discussed in detail in the blog post [Requiem for piet-gpu-hal]. A [vision](https://github.com/linebender/vello/tree/main/doc/vision.md) document dated December 2020 explained the longer-term goals of the project, and how we might get there. Many of these items are out-of-date or completed, but it still may provide some useful background. ## Related projects Vello takes inspiration from many other rendering projects, including: - [Pathfinder](https://github.com/servo/pathfinder) - [Spinel](https://fuchsia.googlesource.com/fuchsia/+/refs/heads/master/src/graphics/lib/compute/spinel/) - [Forma](https://github.com/google/forma) - [Massively Parallel Vector Graphics](https://w3.impa.br/~diego/projects/GanEtAl14/) - [Random-access rendering of general vector graphics](https://hhoppe.com/proj/ravg/) ## License Licensed under either of - Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or ) - MIT license ([LICENSE-MIT](LICENSE-MIT) or ) at your option. In addition, all files in the [`vello_shaders/shader`](https://github.com/linebender/vello/tree/main/vello_shaders/shader) and [`vello_shaders/src/cpu`](https://github.com/linebender/vello/tree/main/vello_shaders/src/cpu) directories and subdirectories thereof are alternatively licensed under the Unlicense ([vello_shaders/shader/UNLICENSE](https://github.com/linebender/vello/tree/main/vello_shaders/shader/UNLICENSE) or ). For clarity, these files are also licensed under either of the above licenses. The intent is for this research to be used in as broad a context as possible. The files in subdirectories of the [`examples/assets`](https://github.com/linebender/vello/tree/main/examples/assets) directory are licensed solely under their respective licenses, available in the `LICENSE` file in their directories.

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