Whenever I pass an argument to emscripten_set_main_loop_arg, it looks like
it becomes a dangling pointer...
I'm very new to rust, so I might be missing something very obvious.
How can I go somewhere, if my application states/variables can't stay valid
between to steps of my main loop?
Here is my source code (main.rs) :
// tried with cargo rustc --release --target wasm32-unknown-emscripten
// and with cargo rustc asmjs-unknown-emscripten -- -C link-args="-g4"
// bindings for emscripten_set_main_loop_arg in Rust:
#![allow(non_camel_case_types)]
#![allow(non_snake_case)]
pub type em_arg_callback_func = Option<unsafe extern "C" fn(arg1: *mut
::std::os::raw::c_void)>;
extern "C" {
pub fn emscripten_set_main_loop_arg(
func: em_arg_callback_func,
arg: *mut ::std::os::raw::c_void,
fps: ::std::os::raw::c_int,
simulate_infinite_loop: ::std::os::raw::c_int,
);
}
// my program
struct ApplicationData {
some_value: u32,
}
extern "C" fn loop_wrapper(ctx: *mut std::os::raw::c_void) {
unsafe {
let a = &mut *(ctx as *mut ApplicationData );
println!("{}", a.some_value); // doesn't print '1982' :(
}
}
fn main() {
unsafe {
let mut a = ApplicationData { some_value:1982 };
let ptr = &mut a as *mut _ as *mut std::os::raw::c_void;
emscripten_set_main_loop_arg(Some(loop_wrapper), ptr, 0, 1);
}
}
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