rust/hwrunner/src/main.rs
author alfadur
Fri, 22 Mar 2019 23:45:59 +0300
changeset 14714 4df1aac5f090
parent 14709 65c971417780
child 14716 8e74d4eb89f5
permissions -rw-r--r--
a bit of cleanup
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use glutin::{
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    dpi, ContextTrait, DeviceEvent, ElementState, Event, EventsLoop, GlProfile, GlRequest,
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    MouseButton, MouseScrollDelta, WindowEvent, WindowedContext,
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};
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use hedgewars_engine::instance::EngineInstance;
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use integral_geometry::Point;
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fn init(event_loop: &EventsLoop, size: dpi::LogicalSize) -> WindowedContext {
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    use glutin::{ContextBuilder, WindowBuilder};
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    let window = WindowBuilder::new()
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        .with_title("hwengine")
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        .with_dimensions(size);
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    let cxt = ContextBuilder::new()
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        .with_gl(GlRequest::Latest)
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        .with_gl_profile(GlProfile::Core)
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        .build_windowed(window, &event_loop)
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        .ok()
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        .unwrap();
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    unsafe {
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        cxt.make_current().unwrap();
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        gl::load_with(|ptr| cxt.get_proc_address(ptr) as *const _);
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        if let Some(sz) = cxt.get_inner_size() {
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            let phys = sz.to_physical(cxt.get_hidpi_factor());
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            gl::Viewport(0, 0, phys.width as i32, phys.height as i32);
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        }
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    }
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    cxt
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}
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fn main() {
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    let mut event_loop = EventsLoop::new();
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    let (w, h) = (1024.0, 768.0);
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    let window = init(&event_loop, dpi::LogicalSize::new(w, h));
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    let mut engine = EngineInstance::new();
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    engine.world.create_renderer(w as u16, h as u16);
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    let mut dragging = false;
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    use std::time::Instant;
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    let mut now = Instant::now();
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    let mut is_running = true;
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    while is_running {
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        let curr = Instant::now();
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        let delta = curr - now;
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        now = curr;
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        let ms = delta.as_secs() as f64 * 1000.0 + delta.subsec_millis() as f64;
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        window.set_title(&format!("hwengine {:.3}ms", ms));
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        event_loop.poll_events(|event| match event {
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            Event::WindowEvent { event, .. } => match event {
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                WindowEvent::CloseRequested => {
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                    is_running = false;
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                }
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                WindowEvent::MouseInput { button, state, .. } => {
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                    if let MouseButton::Right = button {
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                        dragging = state == ElementState::Pressed;
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                    }
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                }
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                WindowEvent::MouseWheel { delta, .. } => {
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                    let zoom_change = match delta {
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                        MouseScrollDelta::LineDelta(x, y) => y as f32 * 0.1f32,
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                        MouseScrollDelta::PixelDelta(delta) => {
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                            let physical = delta.to_physical(window.get_hidpi_factor());
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                            physical.y as f32 * 0.1f32
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                        }
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                    };
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                    engine.world.move_camera(Point::ZERO, zoom_change);
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                }
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                _ => (),
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            },
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            Event::DeviceEvent { event, .. } => match event {
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                DeviceEvent::MouseMotion { delta } => {
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                    if dragging {
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                        engine
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                            .world
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                            .move_camera(Point::new(delta.0 as i32, delta.1 as i32), 0.0)
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                    }
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                }
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                _ => {}
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            },
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            _ => (),
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        });
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        unsafe { window.make_current().unwrap() };
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        engine.render();
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        window.swap_buffers().unwrap();
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    }
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}