sdl3-main

This crate provides tools for using SDL 3's main and callback APIs, and for interfacing with the main thread of the process.

SDL main

To provide your own main but call it through SDL, use the main attribute macro. See the documentation for that for more information.

Callback API

To use the SDL callback API, you can use either the app_impl attribute macro, or all four of the app_init, app_iterate, app_event and app_quit attribute macros. Don't use the main attribute macro in this mode. See the documentation for more information.

Main thread helpers

Some SDL functions have to be called on the main thread of the process. This crate provides some helper types and functions to alleviate this.

• MainThreadToken: Zero-sized token that can only exist on the main thread.
• MainThreadData: Wrapper for data that can move between threads but that should only be accessed on the main thread.
• run_sync_on_main_thread(): Run a callback on the main thread, synchronously.
• run_async_on_main_thread(): Run a callback on the main thread, asynchronously.

Features

Recent changes

• 0.5.4:

  • Fix accidental dependency on Rust 1.84

• 0.5.3:

  • Only use the alloc-less optimization of run_async_on_main_thread if the size of the callback is zero, because that's the only way to guarantee we won't copy uninit bytes, which would be unsound

• 0.5.2:

  • Fix more unsoundness in run_async_on_main_thread

• 0.5.1:

  • Fix unsoundness in run_async_on_main_thread
  • Don't allocate in run_async_on_main_thread unless it's necessary

• 0.5.0:

  • Update sdl3-sys to 0.5.0
  • Add optional parking_lot integration
  • Add run_{sync,async}_on_main_thread and MainThreadData::get[_mut]_on_main_thread
  • impl Copy for MainThreadToken
  • impl FromResidual for AppResult* on nightly

See ChangeLog.md for older changes