Tring out eframe and egui, so i copied an example file, wrote a little demo app and tried generating the wasm to run it in a browser with
RUSTFLAGS='--cfg=web_sys_unstable_apis --cfg getrandom_backend="wasm_js" -Zmacro-backtrace' cargo +nightly build -p "${CRATE_NAME}" --release --lib --target wasm32-unknown-unknown
+nightly and -Zmacro-backtrace to debug the macro expansion, but its not that useful.
In the lib file i have:
mod helper;
mod app;
mod app_logic;
#[cfg(target_arch = "wasm32")]
mod web;
#[cfg(target_arch = "wasm32")]
pub use web::*;
and in the web.rs file:
#![allow(clippy::mem_forget)] // False positives from #[wasm_bindgen] macro
use eframe::wasm_bindgen::{self, prelude::*};
use crate::app::RandomAppRunner;
#[derive(Clone)]
#[wasm_bindgen()]
pub struct WebHandle {
runner: eframe::WebRunner,
}
#[wasm_bindgen()]
impl WebHandle {
/// Installs a panic hook, then returns.
#[allow(clippy::new_without_default, clippy::allow_attributes)]
#[wasm_bindgen(constructor)]
pub fn new() -> Self {
// Redirect [`log`] message to `console.log` and friends:
let log_level = if cfg!(debug_assertions) {
log::LevelFilter::Trace
} else {
log::LevelFilter::Debug
};
eframe::WebLogger::init(log_level).ok();
Self {
runner: eframe::WebRunner::new(),
}
}
/// Call this once from JavaScript to start your app.
#[wasm_bindgen]
pub async fn start(
&self,
canvas: web_sys::HtmlCanvasElement,
) -> Result<(), wasm_bindgen::JsValue> {
self.runner
.start(
canvas,
eframe::WebOptions::default(),
Box::new(|cc| Ok(Box::new(RandomAppRunner::new(cc)))),
)
.await
}
#[wasm_bindgen]
pub fn destroy(&self) {
self.runner.destroy();
}
/// Example on how to call into your app from JavaScript.
#[wasm_bindgen]
pub fn example(&self) {
if let Some(_app) = self.runner.app_mut::<WrapApp>() {
// _app.example();
}
}
/// The JavaScript can check whether or not your app has crashed:
#[wasm_bindgen]
pub fn has_panicked(&self) -> bool {
self.runner.has_panicked()
}
#[wasm_bindgen]
pub fn panic_message(&self) -> Option<String> {
self.runner.panic_summary().map(|s| s.message())
}
#[wasm_bindgen]
pub fn panic_callstack(&self) -> Option<String> {
self.runner.panic_summary().map(|s| s.callstack())
}
}
taken directly from the egui repo.
RandomAppRunner implements eframe::App in another file.
This is the error:
error: recursion limit reached while expanding `#[derive]`
--> random_app/src/web.rs:9:1
|
9 | #[wasm_bindgen]
| ^^^^^^^^^^^^^^^ in this attribute macro expansion
|
::: ~/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/wasm-bindgen-macro-0.2.104/src/lib.rs:10:1
|
10 | pub fn wasm_bindgen(attr: TokenStream, input: TokenStream) -> TokenStream {
| ------------------------------------------------------------------------- in this expansion of `#[wasm_bindgen]`
|
= help: consider increasing the recursion limit by adding a `#![recursion_limit = "256"]` attribute to your crate (`reaction_systems_gui`)
error: could not compile `random_app` (lib) due to 1 previous error
I tried searching and this might be a similar issue but its marked as resolved and I'm using version 104, so I'm confused.
Runs native just fine, so its not the gui that is the problem.
