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//use super::handler::GlHandler;
use super::inputs::{self, Input, KeySet, Mouse, MouseBtn, MouseWheel};
use super::screen::Screen;
use futures::executor::block_on;
use px_backend::winit::{
self,
event::{Event, WindowEvent},
};
/// A Wrapper around an Engine
#[derive(Debug)]
pub struct EngineWrapper(Option<Engine>);
impl EngineWrapper {
/// Create the Engine and the Wrapper
pub fn new(title: String, size: (u32, u32, u32)) -> Self {
Self(Some(Engine::new(title, size)))
}
/// Get a Referance to the inner Engine
pub fn get_inner(&mut self) -> &mut Engine {
self.0.as_mut().unwrap()
}
/// The core of your program,
///
/// Takes a function F that will be run every frame, It will do the event handling and similar
/// things between frames.
pub fn run<F>(mut self, mut main_func: F) -> Self
where
F: (FnMut(&mut Engine) -> Result<bool, Box<dyn std::error::Error>>) + 'static,
{
let mut engine = self.0.unwrap();
self.0 = None;
let mut force_exit = false;
let event_loop = engine.event_loop.unwrap();
engine.event_loop = None;
let mut redraw = true;
let mut redraw_last_frame = false;
event_loop.run(move |e, _, control_flow| {
if redraw_last_frame {
for key in &engine.k_pressed {
engine.k_held.insert(*key);
}
engine.k_pressed.clear();
engine.k_released.clear();
for i in 0..3 {
if engine.mouse.buttons[i].released {
engine.mouse.buttons[i].released = false;
}
if engine.mouse.buttons[i].pressed {
engine.mouse.buttons[i].pressed = false;
engine.mouse.buttons[i].held = true;
}
}
engine.mouse.wheel = MouseWheel::None;
redraw_last_frame = false;
}
match e {
Event::WindowEvent {
event: e,
window_id,
} if window_id == engine.window.id() => match e {
WindowEvent::KeyboardInput { input: inp, .. } => {
if let Some(k) = inp.virtual_keycode {
if inp.state == winit::event::ElementState::Released {
engine.k_pressed.remove(&inputs::Key::from(inp));
engine.k_held.remove(&inputs::Key::from(inp));
engine.k_released.insert(inputs::Key::from(inp));
} else if !engine.k_held.has(k) {
engine.k_pressed.insert(inputs::Key::from(inp));
}
}
}
WindowEvent::CloseRequested => {
force_exit = true;
}
WindowEvent::CursorMoved { position, .. } => {
let (x, y): (f64, f64) = position.into();
//events.push(Events::MouseMove(x, y));
engine.mouse.pos = (
(x / engine.size.2 as f64).floor() as u32,
(y / engine.size.2 as f64).floor() as u32,
);
}
WindowEvent::MouseWheel { delta, .. } => match delta {
winit::event::MouseScrollDelta::LineDelta(x, y) => {
engine.mouse.wheel = if x.abs() > y.abs() {
if x > 0.0 {
MouseWheel::Right
} else if x < 0.0 {
MouseWheel::Left
} else {
MouseWheel::None
}
} else if y > 0.0 {
MouseWheel::Down
} else if y < 0.0 {
MouseWheel::Up
} else {
MouseWheel::None
};
}
winit::event::MouseScrollDelta::PixelDelta(lp) => {
let (x, y): (f64, f64) = lp.into();
engine.mouse.wheel = if x.abs() > y.abs() {
if x > 0.0 {
MouseWheel::Right
} else if x < 0.0 {
MouseWheel::Left
} else {
MouseWheel::None
}
} else if y > 0.0 {
MouseWheel::Down
} else if y < 0.0 {
MouseWheel::Up
} else {
MouseWheel::None
};
}
},
WindowEvent::MouseInput { button, state, .. } => {
if std::mem::discriminant(&button)
!= std::mem::discriminant(&winit::event::MouseButton::Other(0))
{
let btn = match button {
winit::event::MouseButton::Left => MouseBtn::Left,
winit::event::MouseButton::Right => MouseBtn::Right,
winit::event::MouseButton::Middle => MouseBtn::Middle,
winit::event::MouseButton::Other(_) => {
unreachable!("MouseButton::Other()")
}
};
if state == winit::event::ElementState::Pressed {
engine.mouse.buttons[match btn {
MouseBtn::Left => 0,
MouseBtn::Right => 1,
MouseBtn::Middle => 2,
}]
.pressed = true;
} else {
engine.mouse.buttons[match btn {
MouseBtn::Left => 0,
MouseBtn::Right => 1,
MouseBtn::Middle => 2,
}]
.released = true;
engine.mouse.buttons[match btn {
MouseBtn::Left => 0,
MouseBtn::Right => 1,
MouseBtn::Middle => 2,
}]
.held = false;
}
}
}
_ => {}
},
Event::RedrawRequested(_) => {
redraw = true;
}
Event::MainEventsCleared => {
engine.window.request_redraw();
}
_ => {}
}
if redraw {
engine.elapsed = (std::time::SystemTime::now()
.duration_since(engine.timer)
.map_err(|err| err.to_string())
.unwrap())
.as_secs_f64();
// End
engine.timer = std::time::SystemTime::now();
engine.frame_timer += engine.elapsed;
engine.frame_count += 1;
if engine.frame_timer > 1.0 {
engine.frame_timer -= 1.0;
engine
.window
.set_title(&format!("{} - {}fps", engine.title, engine.frame_count));
engine.frame_count = 0;
}
let r = (main_func)(&mut engine);
if r.is_err() || r.as_ref().ok() == Some(&false) || force_exit {
if let Err(e) = r {
if cfg!(debug_assertions) {
println!("Game Stopped:\n{:?}", e);
} else {
println!("Game Stopped:\n{}", e);
}
}
*control_flow = winit::event_loop::ControlFlow::Exit;
}
engine
.handler
.get_screen_slice()
.clone_from_slice(&engine.screen.get_raw());
engine.handler.render();
redraw = false;
redraw_last_frame = true;
}
});
#[allow(unreachable_code)]
{
engine.event_loop = Some(event_loop);
self.0 = Some(engine);
self
}
}
}
/**
* Bone of the Engine, join everything;
**/
pub struct Engine {
/* FRONTEND */
/// Main title of the window, Window's full title will be "Title - fps"
pub title: String,
/// Size of the window, with (x-size,y-size,pixel-size)
pub size: (u32, u32, u32),
/* TIME */
/// Time between current frame and last frame, usefull for movement's calculations
pub elapsed: f64,
timer: std::time::SystemTime,
frame_count: u64,
frame_timer: f64,
/* BACKEND */
/// Game's screen manager, let you draw on the screen
pub screen: Screen,
handler: px_backend::Context,
k_pressed: std::collections::HashSet<inputs::Key>,
k_held: std::collections::HashSet<inputs::Key>,
k_released: std::collections::HashSet<inputs::Key>,
mouse: Mouse,
event_loop: Option<winit::event_loop::EventLoop<()>>,
window: winit::window::Window,
}
impl std::fmt::Debug for Engine {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.debug_struct("Engine")
.field("title", &self.title)
.field("size", &self.size)
.field("elapsed", &self.elapsed)
.field("screen", &self.screen)
.finish()
}
}
impl Engine {
/// Create a new [Engine]
fn new(title: String, size: (u32, u32, u32)) -> Self {
let event_loop = winit::event_loop::EventLoop::new();
let window = winit::window::WindowBuilder::new()
.with_inner_size(winit::dpi::PhysicalSize::new(
(size.0 * size.2) as f32,
(size.1 * size.2) as f32,
))
.with_title(&title)
.with_resizable(false)
.build(&event_loop)
.expect("Error when constructing window");
Engine {
/* FRONTEND */
size,
title,
/* TIME */
timer: std::time::SystemTime::now(),
frame_count: 0u64,
frame_timer: 0f64,
elapsed: 0f64,
/* BACKEND */
handler: block_on(px_backend::Context::new(&window, size)),
screen: Screen::new((size.0, size.1)),
k_pressed: std::collections::HashSet::new(),
k_held: std::collections::HashSet::new(),
k_released: std::collections::HashSet::new(),
mouse: Mouse::new(),
window,
event_loop: Some(event_loop),
}
}
/// Get The status of a key
#[inline]
pub fn get_key(&self, keycode: inputs::Keycodes) -> Input {
Input::new(
self.k_pressed.has(keycode),
self.k_held.has(keycode),
self.k_released.has(keycode),
)
}
/// Get the status of a Mouse Button
pub fn get_mouse_btn(&self, btn: MouseBtn) -> Input {
self.mouse.buttons[match btn {
MouseBtn::Left => 0,
MouseBtn::Right => 1,
MouseBtn::Middle => 2,
}]
}
/// Get the mouse location (in pixel) on the screen
/// Will be defaulted to (0,0) at the start of the program
pub fn get_mouse_location(&self) -> (u32, u32) {
self.mouse.pos
}
/// Get the scroll wheel direction (If Any) during the frame
pub fn get_mouse_wheel(&self) -> MouseWheel {
self.mouse.wheel
}
/// Get all Keys pressed during the last frame
pub fn get_pressed(&self) -> std::collections::HashSet<inputs::Keycodes> {
self.k_pressed.clone().iter().map(|k| k.key).collect()
}
}