mod context;
mod error;
mod game;
mod images;
mod key;
mod log;
pub mod graphics;
mod resources;
mod rectangle;
mod point;
mod color;
mod collections;
mod random;
mod input;
mod metrics;
use metrics::*;
pub use rectangle::*;
pub use point::*;
pub use color::*;
pub use graphics::SpriteBatch;
pub use random::*;
pub use input::*;
pub use context::*;
pub use error::*;
pub use log::*;
pub use game::*;
pub use images::*;
pub use key::*;
use wasm_bindgen::prelude::*;
use wasm_bindgen::JsCast;
use wasm_bindgen::convert::FromWasmAbi;
use std::cell::RefCell;
use std::rc::Rc;
use std::collections::VecDeque;
use web_sys::{
WebGl2RenderingContext,
KeyboardEvent,
EventTarget,
};
use glow::Context as GlowContext;
use glow::HasContext;
#[derive(Debug)]
pub enum Event {
KeyDown(Key),
KeyUp(Key),
ImageLoaded(u32),
}
pub fn clear(context: &mut Context, color: Color) {
let (r, g, b, a) = color.into_normalized();
unsafe {
context.gl.clear_color(r, g, b, a);
context.gl.clear(glow::COLOR_BUFFER_BIT | glow::DEPTH_BUFFER_BIT);
};
}
#[cfg(target_arch = "wasm32")]
fn create_context(canvas: web_sys::HtmlCanvasElement) -> Result<glow::Context, JsValue> {
let gl = canvas
.get_context("webgl2")?
.unwrap()
.dyn_into::<WebGl2RenderingContext>()?;
Ok(GlowContext::from_webgl2_context(gl))
}
#[cfg(not(target_arch = "wasm32"))]
fn create_context(canvas: web_sys::HtmlCanvasElement) -> Result<glow::Context, JsValue> {
unimplemented!()
}
pub fn run(mut game: Box<dyn Game>) -> Result<(), JsValue> {
let document = web_sys::window().unwrap().document().unwrap();
let canvas = document.get_element_by_id("canvas").unwrap();
let canvas: web_sys::HtmlCanvasElement = canvas.dyn_into::<web_sys::HtmlCanvasElement>()?;
let event_queue = Rc::new(RefCell::new(VecDeque::new()));
let event_queue_handle = Rc::clone(&event_queue);
let closure = event(&document, "keydown", move |event: KeyboardEvent| {
event.prevent_default();
event.stop_propagation();
if let Some(key) = into_key(event) {
event_queue_handle.borrow_mut().push_back(Event::KeyDown(key));
}
}).unwrap();
closure.forget();
let event_queue_handle = Rc::clone(&event_queue);
let closure = event(&document, "keyup", move |event: KeyboardEvent| {
event.prevent_default();
event.stop_propagation();
if let Some(key) = into_key(event) {
event_queue_handle.borrow_mut().push_back(Event::KeyUp(key));
}
}).unwrap();
closure.forget();
let gl = create_context(canvas)?;
let f = Rc::new(RefCell::new(None));
let g = f.clone();
let sprite_shader = crate::graphics::Shader::create(
&gl,
crate::resources::SPRITE_BATCH_VERTEX,
crate::resources::SPRITE_BATCH_FRAGMENT
).expect("could not create sprite shader");
unsafe {
gl.viewport(0, 0, 1280, 720);
}
let input = Input::new();
let metrics = Metrics::new();
let mut context = Context::new(gl, event_queue, Images::new(), input, metrics, sprite_shader);
game.initialize(&mut context).expect("Error while initializing");
*g.borrow_mut() = Some(Closure::wrap(Box::new(move || {
context.metrics.reset();
while let Some(event) = context.event_queue.borrow_mut().pop_front() {
match event {
Event::ImageLoaded(id) => {
context.images.finish_loading(id, &mut context.gl).expect("could not finish loading an image");
},
Event::KeyDown(key) => {
context.input.set_key(key);
},
Event::KeyUp(key) => {
context.input.reset_key(key);
},
}
}
context.metrics.start_update();
game.update(&mut context).expect("Error while updating");
context.metrics.end_update();
unsafe {
context.gl.viewport(0, 0, 1280, 720);
}
context.metrics.start_draw();
game.draw(&mut context).expect("Error while drawing");
context.metrics.end_draw();
context.metrics.debug_print();
request_animation_frame(f.borrow().as_ref().unwrap());
}) as Box<dyn FnMut()>));
request_animation_frame(g.borrow().as_ref().unwrap());
Ok(())
}
pub fn load_image(context: &mut Context, url: &str) -> Result<Image, Error> {
let event_queue_handle = Rc::clone(&context.event_queue);
context.images.create_image_from_url(url, event_queue_handle)
}
fn window() -> web_sys::Window {
web_sys::window().expect("no global `window` exists")
}
fn request_animation_frame(f: &Closure<dyn FnMut()>) {
window()
.request_animation_frame(f.as_ref().unchecked_ref())
.expect("should register `requestAnimationFrame` OK");
}
fn event<F, T>(target: &EventTarget, event_name: &str, callback: F) -> Result<Closure<dyn FnMut(T)>, Error>
where
F: FnMut(T) + 'static,
T: FromWasmAbi + 'static,
{
let callback = Closure::wrap(Box::new(callback) as Box<dyn FnMut(T)>);
target.add_event_listener_with_callback(event_name, callback.as_ref().unchecked_ref()).unwrap();
Ok(callback)
}
fn into_key(event: KeyboardEvent) -> Option<Key> {
match (event.key().as_ref(), event.location()) {
("a", _) | ("A", _) => Some(Key::A),
("b", _) | ("B", _) => Some(Key::B),
("c", _) | ("C", _) => Some(Key::C),
("d", _) | ("D", _) => Some(Key::D),
("e", _) | ("E", _) => Some(Key::E),
("f", _) | ("F", _) => Some(Key::F),
("g", _) | ("G", _) => Some(Key::G),
("h", _) | ("H", _) => Some(Key::H),
("i", _) | ("I", _) => Some(Key::I),
("j", _) | ("J", _) => Some(Key::J),
("k", _) | ("K", _) => Some(Key::K),
("l", _) | ("L", _) => Some(Key::L),
("m", _) | ("M", _) => Some(Key::M),
("n", _) | ("N", _) => Some(Key::N),
("o", _) | ("O", _) => Some(Key::O),
("p", _) | ("P", _) => Some(Key::P),
("q", _) | ("Q", _) => Some(Key::Q),
("r", _) | ("R", _) => Some(Key::R),
("s", _) | ("S", _) => Some(Key::S),
("t", _) | ("T", _) => Some(Key::T),
("u", _) | ("U", _) => Some(Key::U),
("v", _) | ("V", _) => Some(Key::V),
("w", _) | ("W", _) => Some(Key::W),
("x", _) | ("X", _) => Some(Key::X),
("y", _) | ("Y", _) => Some(Key::Y),
("z", _) | ("Z", _) => Some(Key::Z),
("0", KeyboardEvent::DOM_KEY_LOCATION_STANDARD) => Some(Key::D0),
("1", KeyboardEvent::DOM_KEY_LOCATION_STANDARD) => Some(Key::D1),
("2", KeyboardEvent::DOM_KEY_LOCATION_STANDARD) => Some(Key::D2),
("3", KeyboardEvent::DOM_KEY_LOCATION_STANDARD) => Some(Key::D3),
("4", KeyboardEvent::DOM_KEY_LOCATION_STANDARD) => Some(Key::D4),
("5", KeyboardEvent::DOM_KEY_LOCATION_STANDARD) => Some(Key::D5),
("6", KeyboardEvent::DOM_KEY_LOCATION_STANDARD) => Some(Key::D6),
("7", KeyboardEvent::DOM_KEY_LOCATION_STANDARD) => Some(Key::D7),
("8", KeyboardEvent::DOM_KEY_LOCATION_STANDARD) => Some(Key::D8),
("9", KeyboardEvent::DOM_KEY_LOCATION_STANDARD) => Some(Key::D9),
("F1", _) => Some(Key::F1),
("F2", _) => Some(Key::F2),
("F3", _) => Some(Key::F3),
("F4", _) => Some(Key::F4),
("F5", _) => Some(Key::F5),
("F6", _) => Some(Key::F6),
("F7", _) => Some(Key::F7),
("F8", _) => Some(Key::F8),
("F9", _) => Some(Key::F9),
("F10", _) => Some(Key::F10),
("F11", _) => Some(Key::F11),
("F12", _) => Some(Key::F12),
("F13", _) => Some(Key::F13),
("F14", _) => Some(Key::F14),
("F15", _) => Some(Key::F15),
("F16", _) => Some(Key::F16),
("F17", _) => Some(Key::F17),
("F18", _) => Some(Key::F18),
("F19", _) => Some(Key::F19),
("F20", _) => Some(Key::F20),
("F21", _) => Some(Key::F21),
("F22", _) => Some(Key::F22),
("F23", _) => Some(Key::F23),
("F24", _) => Some(Key::F24),
("NumLock", _) => Some(Key::NumLock),
("0", KeyboardEvent::DOM_KEY_LOCATION_NUMPAD) => Some(Key::NumPad1),
("1", KeyboardEvent::DOM_KEY_LOCATION_NUMPAD) => Some(Key::NumPad2),
("2", KeyboardEvent::DOM_KEY_LOCATION_NUMPAD) => Some(Key::NumPad3),
("3", KeyboardEvent::DOM_KEY_LOCATION_NUMPAD) => Some(Key::NumPad4),
("4", KeyboardEvent::DOM_KEY_LOCATION_NUMPAD) => Some(Key::NumPad5),
("5", KeyboardEvent::DOM_KEY_LOCATION_NUMPAD) => Some(Key::NumPad6),
("6", KeyboardEvent::DOM_KEY_LOCATION_NUMPAD) => Some(Key::NumPad7),
("7", KeyboardEvent::DOM_KEY_LOCATION_NUMPAD) => Some(Key::NumPad8),
("8", KeyboardEvent::DOM_KEY_LOCATION_NUMPAD) => Some(Key::NumPad9),
("9", KeyboardEvent::DOM_KEY_LOCATION_NUMPAD) => Some(Key::NumPad0),
("+", KeyboardEvent::DOM_KEY_LOCATION_NUMPAD) => Some(Key::OemPlus), ("-", KeyboardEvent::DOM_KEY_LOCATION_NUMPAD) => Some(Key::OemMinus), ("*", KeyboardEvent::DOM_KEY_LOCATION_NUMPAD) => Some(Key::Multiply), ("/", KeyboardEvent::DOM_KEY_LOCATION_NUMPAD) => Some(Key::Divide), ("Enter", KeyboardEvent::DOM_KEY_LOCATION_NUMPAD) => Some(Key::Enter),
("Control", KeyboardEvent::DOM_KEY_LOCATION_LEFT) => Some(Key::LeftControl),
("Shift", KeyboardEvent::DOM_KEY_LOCATION_LEFT) => Some(Key::LeftShift),
("Alt", KeyboardEvent::DOM_KEY_LOCATION_LEFT) => Some(Key::LeftAlt),
("Control", KeyboardEvent::DOM_KEY_LOCATION_RIGHT) => Some(Key::RightControl),
("Shift", KeyboardEvent::DOM_KEY_LOCATION_RIGHT) => Some(Key::RightShift),
("Alt", KeyboardEvent::DOM_KEY_LOCATION_RIGHT) => Some(Key::RightAlt),
("ArrowUp", _) => Some(Key::Up),
("ArrowDown", _) => Some(Key::Down),
("ArrowLeft", _) => Some(Key::Left),
("ArrowRight", _) => Some(Key::Right),
("&", _) => Some(Key::None), ("*", KeyboardEvent::DOM_KEY_LOCATION_STANDARD) => Some(Key::None), ("@", _) => Some(Key::None), ("`", _) => Some(Key::None), ("\\", _) => Some(Key::None), ("Backspace", _) => Some(Key::None), ("CapsLock", _) => Some(Key::CapsLock),
("^", _) => Some(Key::None), (":", _) => Some(Key::None), (",", _) => Some(Key::None), ("Delete", _) => Some(Key::Delete),
("$", _) => Some(Key::None), ("\"", _) => Some(Key::None), ("End", _) => Some(Key::End),
("Enter", KeyboardEvent::DOM_KEY_LOCATION_STANDARD) => Some(Key::Enter),
("=", _) => Some(Key::None), ("Escape", _) => Some(Key::Escape),
("!", _) => Some(Key::None), (">", _) => Some(Key::None), ("#", _) => Some(Key::None), ("Home", _) => Some(Key::Home),
("Insert", _) => Some(Key::Insert),
("{", _) => Some(Key::None), ("(", _) => Some(Key::None), ("<", _) => Some(Key::None), ("-", KeyboardEvent::DOM_KEY_LOCATION_STANDARD) => Some(Key::None), ("PageDown", _) => Some(Key::PageDown),
("PageUp", _) => Some(Key::PageUp),
("Pause", _) => Some(Key::Pause),
("%", _) => Some(Key::None), (".", _) => Some(Key::None), ("+", KeyboardEvent::DOM_KEY_LOCATION_STANDARD) => Some(Key::None), ("PrintScreen", _) => Some(Key::PrintScreen),
("?", _) => Some(Key::None), ("'", _) => Some(Key::None), ("}", _) => Some(Key::None), (")", _) => Some(Key::None), ("ScrollLock", _) => Some(Key::None), (";", _) => Some(Key::None), ("/", KeyboardEvent::DOM_KEY_LOCATION_STANDARD) => Some(Key::None), (" ", _) => Some(Key::Space),
("Tab", _) => Some(Key::Tab),
("_", _) => Some(Key::None),
_ => None,
}
}