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https://github.com/Xevion/rust-sdl2-emscripten.git
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Strip to hello-world repo
This commit is contained in:
178
src/main.rs
178
src/main.rs
@@ -1,153 +1,61 @@
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use sdl2::event::{Event, WindowEvent};
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use std::time::{Duration, Instant};
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use tracing::event;
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use tracing_error::ErrorLayer;
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use tracing_subscriber::layer::SubscriberExt;
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use std::cell::RefCell;
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use std::rc::Rc;
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#[cfg(target_family = "wasm")]
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pub mod emscripten;
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use sdl2::rect::Rect;
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pub fn main() {
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use pacman::main_loop;
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// Resources
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// https://developer.mozilla.org/en-US/docs/WebAssembly/Rust_to_Wasm
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// https://puddleofcode.com/story/definitive-guide-to-rust-sdl2-and-emscriptem/
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// To build locally:
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// cargo run
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// To build for the web:
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// rustup target add asmjs-unknown-emscripten
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// export EMCC_CFLAGS="-s USE_SDL=2"
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// cargo build --target asmjs-unknown-emscripten && open index.html
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fn main() {
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let ctx = sdl2::init().unwrap();
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let video = ctx.video().unwrap();
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let video_ctx = ctx.video().unwrap();
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// Setup tracing
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let subscriber = tracing_subscriber::fmt()
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.with_ansi(cfg!(not(target_os = "emscripten")))
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.with_max_level(tracing::Level::DEBUG)
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.finish()
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.with(ErrorLayer::default());
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tracing::subscriber::set_global_default(subscriber).expect("Could not set global default");
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let window = video
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.window("SDL2 Test", 800, 800)
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let window = match video_ctx
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.window("Hello, Rust / SDL2 / WASM!", 640, 480)
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.position_centered()
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.opengl()
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.build()
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.expect("Could not initialize window");
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let mut canvas = window
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.into_canvas()
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.present_vsync()
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.build()
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.expect("Could not build canvas");
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canvas
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.set_logical_size(800, 800)
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.expect("Could not set logical size");
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// let texture_creator = canvas.texture_creator();
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let mut event_pump = ctx
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.event_pump()
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.expect("Could not get SDL EventPump");
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let loop_time = Duration::from_secs(1) / 60;
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let mut shown = true;
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// The start of a period of time over which we average the frame time.
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let mut sleep_time = Duration::ZERO;
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let mut main_loop = move || {
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let start = Instant::now();
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// TODO: Fix key repeat delay issues by using VecDeque for instant key repeat
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// for event in event_pump.poll_iter() {
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// match event {
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// Event::Window { win_event, .. } => match win_event {
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// WindowEvent::Hidden => {
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// event!(tracing::Level::WARN, "Window hidden");
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// shown = false;
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// }
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// WindowEvent::Shown => {
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// event!(tracing::Level::WARN, "Window shown");
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// shown = true;
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// }
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// _ => {}
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// },
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// // Handle quitting keys or window close
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// Event::KeyDown {
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// keycode: Some(sdl2::keyboard::Keycode::Escape),
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// ..
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// }
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// | Event::Quit { .. } => {
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// event!(tracing::Level::INFO, "Exit requested. Exiting...");
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// return;
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// }
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// _ => {
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// event!(tracing::Level::WARN, "Unhandled event: {:?}", event);
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// }
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// }
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// }
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if shown {
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// Set background to black
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canvas.set_draw_color(sdl2::pixels::Color::RGB(0, 0, 0));
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canvas.clear();
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// // Draw a square under the mouse
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// let mouse_state = event_pump.mouse_state();
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// let mouse_x = mouse_state.x();
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// let mouse_y = mouse_state.y();
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// let square = sdl2::rect::Rect::new(mouse_x - 25, mouse_y - 25, 50, 50);
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// canvas.set_draw_color(sdl2::pixels::Color::RGB(0, 255, 255));
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// canvas.fill_rect(square).unwrap();
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// canvas.set_draw_color(sdl2::pixels::Color::RGBA(255, 255, 255, 50));
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// canvas
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// .draw_line(
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// sdl2::rect::Point::new(0, 0),
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// sdl2::rect::Point::new(mouse_x, mouse_y),
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// )
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// .unwrap();
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canvas.present();
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event!(
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tracing::Level::WARN,
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"Loop took: {:?} (max {:?})",
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start.elapsed(),
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loop_time
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);
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if start.elapsed() < loop_time {
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let time = loop_time.saturating_sub(start.elapsed());
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if time != Duration::ZERO {
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#[cfg(not(target_os = "emscripten"))]
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{
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spin_sleep::sleep(time);
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}
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#[cfg(target_os = "emscripten")]
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{
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std::thread::sleep(time);
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}
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}
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sleep_time += time;
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} else {
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event!(
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tracing::Level::WARN,
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"Game loop behind schedule by: {:?}",
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start.elapsed() - loop_time
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);
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}
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}
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.build() {
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Ok(window) => window,
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Err(err) => panic!("failed to create window: {}", err)
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};
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#[cfg(target_family = "wasm")]
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use crate::emscripten;
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let canvas = match window
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.into_canvas()
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.present_vsync()
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.build() {
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Ok(canvas) => canvas,
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Err(err) => panic!("failed to create canvas: {}", err)
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};
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let rect = Rect::new(0, 0, 10, 10);
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let ctx = Rc::new(RefCell::new(ctx));
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let rect = Rc::new(RefCell::new(rect));
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let canvas = Rc::new(RefCell::new(canvas));
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#[cfg(target_family = "wasm")]
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emscripten::set_main_loop_callback(main_loop);
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use pacman::emscripten;
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#[cfg(target_family = "wasm")]
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emscripten::set_main_loop_callback(main_loop(Rc::clone(&ctx), Rc::clone(&rect), Rc::clone(&canvas)));
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#[cfg(not(target_family = "wasm"))]
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{
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use std::thread::sleep;
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use std::time::Duration;
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loop {
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// main_loop(Rc::clone(&ctx), Rc::clone(&rect), Rc::clone(&canvas))();
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main_loop();
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main_loop(Rc::clone(&ctx), Rc::clone(&rect), Rc::clone(&canvas))();
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sleep(Duration::from_millis(10))
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}
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}
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}
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}
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