diff options
| -rw-r--r-- | src/emscripten.rs | 44 | ||||
| -rw-r--r-- | src/main.rs | 76 |
2 files changed, 89 insertions, 31 deletions
diff --git a/src/emscripten.rs b/src/emscripten.rs new file mode 100644 index 0000000..3b9b12c --- /dev/null +++ b/src/emscripten.rs @@ -0,0 +1,44 @@ +#[cfg(target_os = "emscripten")] +pub mod emscripten { + use std::cell::RefCell; + use std::os::raw::{c_float, c_int, c_void}; + use std::ptr::null_mut; + + #[allow(non_camel_case_types)] + type em_callback_func = unsafe extern "C" fn(); + + extern "C" { + pub fn emscripten_set_main_loop( + func: em_callback_func, + fps: c_int, + simulate_infinite_loop: c_int, + ); + pub fn emscripten_cancel_main_loop(); + pub fn emscripten_get_now() -> c_float; + } + + thread_local!(static MAIN_LOOP_CALLBACK: RefCell<*mut c_void> = RefCell::new(null_mut())); + + pub fn set_main_loop_callback<F>(callback: F) + where + F: FnMut(), + { + MAIN_LOOP_CALLBACK.with(|log| { + *log.borrow_mut() = &callback as *const _ as *mut c_void; + }); + + unsafe { + emscripten_set_main_loop(wrapper::<F>, 0, 1); + } + + unsafe extern "C" fn wrapper<F>() + where + F: FnMut(), + { + MAIN_LOOP_CALLBACK.with(|z| { + let closure = *z.borrow_mut() as *mut F; + (*closure)(); + }); + } + } +} diff --git a/src/main.rs b/src/main.rs index 51a6ed9..edf6f2e 100644 --- a/src/main.rs +++ b/src/main.rs @@ -10,6 +10,9 @@ use sdl2::event::Event; use sdl2::gfx::primitives::DrawRenderer; use sdl2::pixels::Color; +#[cfg(target_os = "emscripten")] +pub mod emscripten; + fn find_origin() -> (i16, i16) { let mut rng = rand::thread_rng(); (rng.gen_range(100, 400), rng.gen_range(100, 400)) @@ -71,8 +74,8 @@ fn main() { let mut rng = rand::thread_rng(); lines.shuffle(&mut rng); - let a = rng.gen_range(-5.0, 5.0); - let b = rng.gen_range(-5.0, 5.0); + let a = rng.gen_range(-7.0, 7.0); + let b = rng.gen_range(-7.0, 7.0); let mut pixels = Vec::new(); for i in (1000..200000).step_by(10) { @@ -85,36 +88,47 @@ fn main() { }); } - let mut i = 0; - let mut run = true; - while run { - for event in events.poll_iter() { - if let Event::Quit { .. } = event { - run = false - }; - } + let mut main_loop = || { + let mut i = 0; + let mut run = true; + while run { + for event in events.poll_iter() { + if let Event::Quit { .. } = event { + run = false + }; + } - if i < lines.len() { - let line = &lines[i]; - canvas - .line( - line.x1, - line.y1, - line.x2, - line.y2, - Color::RGB(255, 255, 255), - ) - .unwrap(); - } - if i < pixels.len() { - let pixel = &pixels[i]; - canvas - .pixel(pixel.x, pixel.y, Color::RGB(255, 255, 255)) - .unwrap(); + if i < lines.len() { + let line = &lines[i]; + canvas + .line( + line.x1, + line.y1, + line.x2, + line.y2, + Color::RGB(255, 255, 255), + ) + .unwrap(); + } + if i < pixels.len() { + let pixel = &pixels[i]; + canvas + .pixel(pixel.x, pixel.y, Color::RGB(255, 255, 255)) + .unwrap(); + } + + canvas.present(); + thread::sleep(Duration::from_millis(10)); + i += 1; } + }; - canvas.present(); - thread::sleep(Duration::from_millis(10)); - i += 1; - } + #[cfg(target_os = "emscripten")] + use emscripten::emscripten; + + #[cfg(target_os = "emscripten")] + emscripten::set_main_loop_callback(main_loop); + + #[cfg(not(target_os = "emscripten"))] + main_loop(); } |