xevion/rust-sdl2-emscripten
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Strip to hello-world repo

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Xevion
2024-04-14 01:35:42 -05:00
parent d0b8ebfff5
commit 903dedafd1
7 changed files with 91 additions and 159 deletions
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2
.cargo/config.toml
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@@ -4,7 +4,7 @@ rustflags = [
# "-O", "-C", "link-args=-O2 --profiling",
#"-C", "link-args=-O3 --closure 1",
# "-C", "link-args=-sASYNCIFY -sALLOW_MEMORY_GROWTH=1",
"-C", "link-args=-sUSE_SDL=2 -sUSE_SDL_IMAGE=2 -sSDL2_IMAGE_FORMATS=['png']",
# "-C", "link-args=-sUSE_SDL=2 -sUSE_SDL_IMAGE=2 -sSDL2_IMAGE_FORMATS=['png']",
# USE_OGG, USE_VORBIS for OGG/VORBIS usage
# "-C", "link-args=--preload-file assets/",
]

2
.github/workflows/deploy.yaml vendored
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@@ -26,7 +26,7 @@ jobs:
uses: Swatinem/rust-cache@v1
- name: Build # build
run: ./scripts/build-wasm.sh
run: ./scripts/build.sh -r
- name: Upload Artifact
uses: actions/upload-pages-artifact@v2

2
Cargo.toml
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@@ -10,6 +10,6 @@ colors-transform = "0.2.11"
lazy_static = "1.4.0"
sdl2 = { version = "0.36", features = ["image", "ttf", "mixer"] }
spin_sleep = "1.1.1"
tracing = { version = "0.1.37", features = ["max_level_debug", "release_max_level_warn"]}
tracing = { version = "0.1.37", features = ["max_level_debug", "release_max_level_debug"]}
tracing-error = "0.2.0"
tracing-subscriber = {version = "0.3.17", features = ["env-filter"]}

13
scripts/build-wasm.sh
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@@ -1,13 +0,0 @@
#!/bin/sh
# set -eu
echo "Building WASM with Emscripten"
cargo build --target=wasm32-unknown-emscripten --release
echo "Copying release files to dist/"
mkdir -p dist
output_folder="target/wasm32-unknown-emscripten/release"
cp $output_folder/pacman.wasm dist
cp $output_folder/pacman.js dist
cp $output_folder/deps/pacman.data dist
cp assets/index.html dist

45
scripts/build.sh Executable file
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@@ -0,0 +1,45 @@
#!/bin/bash
set -eu
release='false'
serve='false'
print_usage() {
printf "Usage: -r RELEASE -d DEBUG -s SERVE\n"
}
while getopts 'rds' flag; do
case "${flag}" in
r) release='true' ;;
d) release='false' ;;
s) serve='true' ;;
*) print_usage
exit 1 ;;
esac
done
echo "Activating Emscripten"
./../emsdk/emsdk activate latest
source ../emsdk/emsdk_env.sh
export EMCC_CFLAGS="-s USE_SDL=2"
echo "Building WASM with Emscripten"
build_type='debug'
if [ "$release" = 'true' ]; then
cargo build --target=wasm32-unknown-emscripten --release
build_type='release'
else
cargo build --target=wasm32-unknown-emscripten
fi
echo "Copying WASM files"
mkdir -p dist
output_folder="target/wasm32-unknown-emscripten/$build_type"
cp assets/index.html dist
cp $output_folder/pacman.wasm dist
cp $output_folder/pacman.js dist
if [ "$serve" = 'true' ]; then
echo "Serving WASM with Emscripten"
python3 -m http.server -d ./dist/ 8080
fi

8
scripts/serve-wasm.sh
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@@ -1,8 +0,0 @@
#!/bin/sh
set -eu
echo "Building WASM with Emscripten"
./scripts/build-wasm.sh
echo "Serving WASM with Emscripten"
python3 -m http.server -d ./dist/ 8080

176
src/main.rs
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@@ -1,152 +1,60 @@
use sdl2::event::{Event, WindowEvent};
use std::time::{Duration, Instant};
use tracing::event;
use tracing_error::ErrorLayer;
use tracing_subscriber::layer::SubscriberExt;
use std::cell::RefCell;
use std::rc::Rc;
#[cfg(target_family = "wasm")]
pub mod emscripten;
use sdl2::rect::Rect;
pub fn main() {
use pacman::main_loop;
// Resources
// https://developer.mozilla.org/en-US/docs/WebAssembly/Rust_to_Wasm
// https://puddleofcode.com/story/definitive-guide-to-rust-sdl2-and-emscriptem/
// To build locally:
// cargo run
// To build for the web:
// rustup target add asmjs-unknown-emscripten
// export EMCC_CFLAGS="-s USE_SDL=2"
// cargo build --target asmjs-unknown-emscripten && open index.html
fn main() {
let ctx = sdl2::init().unwrap();
let video = ctx.video().unwrap();
let video_ctx = ctx.video().unwrap();
// Setup tracing
let subscriber = tracing_subscriber::fmt()
.with_ansi(cfg!(not(target_os = "emscripten")))
.with_max_level(tracing::Level::DEBUG)
.finish()
.with(ErrorLayer::default());
tracing::subscriber::set_global_default(subscriber).expect("Could not set global default");
let window = video
.window("SDL2 Test", 800, 800)
let window = match video_ctx
.window("Hello, Rust / SDL2 / WASM!", 640, 480)
.position_centered()
.opengl()
.build()
.expect("Could not initialize window");
let mut canvas = window
.into_canvas()
.present_vsync()
.build()
.expect("Could not build canvas");
canvas
.set_logical_size(800, 800)
.expect("Could not set logical size");
// let texture_creator = canvas.texture_creator();
let mut event_pump = ctx
.event_pump()
.expect("Could not get SDL EventPump");
let loop_time = Duration::from_secs(1) / 60;
let mut shown = true;
// The start of a period of time over which we average the frame time.
let mut sleep_time = Duration::ZERO;
let mut main_loop = move || {
let start = Instant::now();
// TODO: Fix key repeat delay issues by using VecDeque for instant key repeat
// for event in event_pump.poll_iter() {
// match event {
// Event::Window { win_event, .. } => match win_event {
// WindowEvent::Hidden => {
// event!(tracing::Level::WARN, "Window hidden");
// shown = false;
// }
// WindowEvent::Shown => {
// event!(tracing::Level::WARN, "Window shown");
// shown = true;
// }
// _ => {}
// },
// // Handle quitting keys or window close
// Event::KeyDown {
// keycode: Some(sdl2::keyboard::Keycode::Escape),
// ..
// }
// | Event::Quit { .. } => {
// event!(tracing::Level::INFO, "Exit requested. Exiting...");
// return;
// }
// _ => {
// event!(tracing::Level::WARN, "Unhandled event: {:?}", event);
// }
// }
// }
if shown {
// Set background to black
canvas.set_draw_color(sdl2::pixels::Color::RGB(0, 0, 0));
canvas.clear();
// // Draw a square under the mouse
// let mouse_state = event_pump.mouse_state();
// let mouse_x = mouse_state.x();
// let mouse_y = mouse_state.y();
// let square = sdl2::rect::Rect::new(mouse_x - 25, mouse_y - 25, 50, 50);
// canvas.set_draw_color(sdl2::pixels::Color::RGB(0, 255, 255));
// canvas.fill_rect(square).unwrap();
// canvas.set_draw_color(sdl2::pixels::Color::RGBA(255, 255, 255, 50));
// canvas
// .draw_line(
// sdl2::rect::Point::new(0, 0),
// sdl2::rect::Point::new(mouse_x, mouse_y),
// )
// .unwrap();
canvas.present();
event!(
tracing::Level::WARN,
"Loop took: {:?} (max {:?})",
start.elapsed(),
loop_time
);
if start.elapsed() < loop_time {
let time = loop_time.saturating_sub(start.elapsed());
if time != Duration::ZERO {
#[cfg(not(target_os = "emscripten"))]
{
spin_sleep::sleep(time);
}
#[cfg(target_os = "emscripten")]
{
std::thread::sleep(time);
}
}
sleep_time += time;
} else {
event!(
tracing::Level::WARN,
"Game loop behind schedule by: {:?}",
start.elapsed() - loop_time
);
}
}
.build() {
Ok(window) => window,
Err(err) => panic!("failed to create window: {}", err)
};
#[cfg(target_family = "wasm")]
use crate::emscripten;
let canvas = match window
.into_canvas()
.present_vsync()
.build() {
Ok(canvas) => canvas,
Err(err) => panic!("failed to create canvas: {}", err)
};
let rect = Rect::new(0, 0, 10, 10);
let ctx = Rc::new(RefCell::new(ctx));
let rect = Rc::new(RefCell::new(rect));
let canvas = Rc::new(RefCell::new(canvas));
#[cfg(target_family = "wasm")]
emscripten::set_main_loop_callback(main_loop);
use pacman::emscripten;
#[cfg(target_family = "wasm")]
emscripten::set_main_loop_callback(main_loop(Rc::clone(&ctx), Rc::clone(&rect), Rc::clone(&canvas)));
#[cfg(not(target_family = "wasm"))]
{
use std::thread::sleep;
use std::time::Duration;
loop {
// main_loop(Rc::clone(&ctx), Rc::clone(&rect), Rc::clone(&canvas))();
main_loop();
main_loop(Rc::clone(&ctx), Rc::clone(&rect), Rc::clone(&canvas))();
sleep(Duration::from_millis(10))
}
}