maplibre-rs is an upcoming and cross-platform vector map renderer written in Rust. If you want to get in touch with the developers, visit the #maplibre:matrix.org chat or join the MapLibre (#maplibre and #maplibre-rs) community within the OpenStreetMap Slack. You can get an invitation here.
📰 News
It has been an exciting summer - FOSS4G happened and a paper about maplibre-rs was published. The whole MapLibre team was able to meet! We met our sponsors and other awesome people from the open-source community.
And because a picture is worth a thousand words:
Behind the scenes, I was working on providing an alternative multi-threading implementation for the web platform. Because atomics are only supported by enabling specific HTTP headers, we really need a more portable implementation which does not rely on these atomics. Instead of doing real multithreading in the browser, we want to do multiprocessing through WebWorkers. I designed an interface which should work well for most data-processing needs. The interface is called AsyncProcedureCall.
1#[derive(Clone)]
2pub enum Message<T: Transferables> {
3 TileTessellated(T::TileTessellated),
4 UnavailableLayer(T::UnavailableLayer),
5 TessellatedLayer(T::TessellatedLayer),
6}
7
8#[derive(Clone, Serialize, Deserialize)]
9pub enum Input {
10 TileRequest(TileRequest),
11}
12
13pub type AsyncProcedure<C> = fn(input: Input, context: C) -> AsyncProcedureFuture;
14
15pub trait AsyncProcedureCall<T: Transferables, HC: HttpClient>: 'static {
16 type Context: Context<T, HC> + Send;
17
18 fn receive(&mut self) -> Option<Message<T>>;
19
20 fn schedule(&self, input: Input, procedure: AsyncProcedure<Self::Context>);
21}
Instead of relying on mutexes and MPSC channels, the implementation of this APC for the web relies on WebWorkers and sending ArrayBuffers.
I’m working on this in a rather large PR. As not much else is going on in the project, merging probably won’t cause issues.
🏠 Housekeeping
The following will summarizes what happened last week on GitHub.
🎁 Merged Pull Requests
#169 Add watch functionality for web by @maxammann
We have now build tools for the web which automatically reloads the demo in the browser for changes in Rust.#167 Add citation instructions by @maxammann
The maplibre-rs is now officially citable in others scientific work!#160 Add CLI to demo by @maxammann
A CLI allows users now to configure the demo on Linux, Windows and macOS.#154 Run scheduled builds by @maxammann
We regularly build our main branch now, to detect breaking dependencies.#80 Refactor WebWorker pool by @maxammann
This is the start of a major refactor for async tasks on the web.
🎁 New Issues
#166 ReferenceError: Can’t find variable: Worker by @maxammann
This bug blocks us currently on Safari (iOS/macOS). I’m actively working right now to provide a build which does not use atomics.#164 INVALID_ENUM: framebuffertexture2d invalid attachment by @maxammann
This is a bug in older versions in Safari. With the release of iOS 16 and Safari 16 this is fixed now.#161 Limit the maximum and minimum zoom level by @hanchao
We got a great bug report! It seems like people are experimenting with maplibre-rs in the wild!
🧵 Current Discussions
None.
👋 Contributors
- @karisair
- @birkskyum
- @BezPowell
- @Quillasp - Thanks for working on raster tile support!