129 lines
4.4 KiB
Rust
129 lines
4.4 KiB
Rust
//! Example how to use pure `egui_glow`.
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#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")] // hide console window on Windows in release
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#![allow(unsafe_code)]
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fn main() {
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let mut clear_color = [0.1, 0.1, 0.1];
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let event_loop = glutin::event_loop::EventLoopBuilder::with_user_event().build();
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let (gl_window, gl) = create_display(&event_loop);
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let gl = std::sync::Arc::new(gl);
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let mut egui_glow = egui_glow::EguiGlow::new(&event_loop, gl.clone());
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event_loop.run(move |event, _, control_flow| {
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let mut redraw = || {
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let mut quit = false;
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let repaint_after = egui_glow.run(gl_window.window(), |egui_ctx| {
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egui::SidePanel::left("my_side_panel").show(egui_ctx, |ui| {
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ui.heading("Hello World!");
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if ui.button("Quit").clicked() {
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quit = true;
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}
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ui.color_edit_button_rgb(&mut clear_color);
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});
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});
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*control_flow = if quit {
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glutin::event_loop::ControlFlow::Exit
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} else if repaint_after.is_zero() {
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gl_window.window().request_redraw();
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glutin::event_loop::ControlFlow::Poll
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} else if let Some(repaint_after_instant) =
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std::time::Instant::now().checked_add(repaint_after)
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{
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glutin::event_loop::ControlFlow::WaitUntil(repaint_after_instant)
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} else {
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glutin::event_loop::ControlFlow::Wait
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};
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{
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unsafe {
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use glow::HasContext as _;
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gl.clear_color(clear_color[0], clear_color[1], clear_color[2], 1.0);
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gl.clear(glow::COLOR_BUFFER_BIT);
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}
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// draw things behind egui here
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egui_glow.paint(gl_window.window());
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// draw things on top of egui here
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gl_window.swap_buffers().unwrap();
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}
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};
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match event {
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// Platform-dependent event handlers to workaround a winit bug
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// See: https://github.com/rust-windowing/winit/issues/987
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// See: https://github.com/rust-windowing/winit/issues/1619
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glutin::event::Event::RedrawEventsCleared if cfg!(windows) => redraw(),
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glutin::event::Event::RedrawRequested(_) if !cfg!(windows) => redraw(),
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glutin::event::Event::WindowEvent { event, .. } => {
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use glutin::event::WindowEvent;
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if matches!(event, WindowEvent::CloseRequested | WindowEvent::Destroyed) {
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*control_flow = glutin::event_loop::ControlFlow::Exit;
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}
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if let glutin::event::WindowEvent::Resized(physical_size) = &event {
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gl_window.resize(*physical_size);
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} else if let glutin::event::WindowEvent::ScaleFactorChanged {
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new_inner_size,
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..
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} = &event
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{
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gl_window.resize(**new_inner_size);
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}
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egui_glow.on_event(&event);
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gl_window.window().request_redraw(); // TODO(emilk): ask egui if the events warrants a repaint instead
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}
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glutin::event::Event::LoopDestroyed => {
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egui_glow.destroy();
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}
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glutin::event::Event::NewEvents(glutin::event::StartCause::ResumeTimeReached {
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..
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}) => {
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gl_window.window().request_redraw();
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}
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_ => (),
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}
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});
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}
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fn create_display(
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event_loop: &glutin::event_loop::EventLoop<()>,
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) -> (
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glutin::WindowedContext<glutin::PossiblyCurrent>,
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glow::Context,
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) {
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let window_builder = glutin::window::WindowBuilder::new()
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.with_resizable(true)
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.with_inner_size(glutin::dpi::LogicalSize {
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width: 800.0,
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height: 600.0,
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})
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.with_title("egui_glow example");
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let gl_window = unsafe {
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glutin::ContextBuilder::new()
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.with_depth_buffer(0)
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.with_srgb(true)
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.with_stencil_buffer(0)
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.with_vsync(true)
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.build_windowed(window_builder, event_loop)
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.unwrap()
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.make_current()
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.unwrap()
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};
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let gl = unsafe { glow::Context::from_loader_function(|s| gl_window.get_proc_address(s)) };
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(gl_window, gl)
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}
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