learn-wgpu/code/research/camera/src/main.rs

mod camera;
mod data;
mod demo;
mod pipeline;
mod resource;

use demo::*;

use winit::dpi::*;
use winit::event::*;
use winit::event_loop::{ControlFlow, EventLoop};
use winit::window::*;

use futures::executor::block_on;

use std::time::Instant;

fn main() {
    env_logger::init();
    let event_loop = EventLoop::new();
    let window = WindowBuilder::new()
        .with_inner_size(PhysicalSize::new(800, 600))
        .with_title(env!("CARGO_PKG_NAME"))
        .build(&event_loop)
        .unwrap();
    let mut demo = block_on(Demo::new(&window));
    let mut last_update = Instant::now();
    let mut is_focused = false;
    event_loop.run(move |event, _, control_flow| {
        *control_flow = if is_focused {
            ControlFlow::Poll
        } else if demo.is_running {
            ControlFlow::Wait
        } else {
            ControlFlow::Exit
        };
        match event {
            Event::MainEventsCleared => {
                if is_focused {
                    window.request_redraw();
                }
            }
            Event::WindowEvent {
                ref event,
                window_id,
            } => {
                if window_id == window.id() && !demo.input(event) {
                    match event {
                        WindowEvent::Focused(f) => is_focused = *f,
                        WindowEvent::CloseRequested => *control_flow = ControlFlow::Exit,
                        WindowEvent::ScaleFactorChanged { new_inner_size, .. } => {
                            demo.resize(**new_inner_size)
                        }
                        WindowEvent::Resized(new_size) => demo.resize(*new_size),
                        _ => {}
                    }
                }
            }
            Event::RedrawRequested(window_id) => {
                if window_id == window.id() {
                    let now = Instant::now();
                    let dt = now - last_update;
                    last_update = now;
                    demo.update(dt);
                    demo.render();
                }
            }
            _ => {}
        }
    });
}