131 lines
4.1 KiB
Rust
131 lines
4.1 KiB
Rust
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//! Example how to use pure `egui_glow` without [`epi`].
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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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unsafe {
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use glow::HasContext;
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gl.enable(glow::FRAMEBUFFER_SRGB);
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}
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(gl_window, gl)
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}
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fn main() {
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let event_loop = glutin::event_loop::EventLoop::with_user_event();
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let (gl_window, gl) = create_display(&event_loop);
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let mut egui = egui_glow::EguiGlow::new(&gl_window, &gl);
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event_loop.run(move |event, _, control_flow| {
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let mut redraw = || {
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egui.begin_frame(gl_window.window());
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let mut quit = false;
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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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egui::ComboBox::from_label("Version")
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.width(150.0)
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.selected_text("foo")
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.show_ui(ui, |ui| {
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egui::CollapsingHeader::new("Dev")
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.default_open(true)
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.show(ui, |ui| {
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ui.label("contents");
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});
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});
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});
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let (needs_repaint, shapes) = egui.end_frame(gl_window.window());
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*control_flow = if quit {
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glutin::event_loop::ControlFlow::Exit
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} else if needs_repaint {
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gl_window.window().request_redraw();
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glutin::event_loop::ControlFlow::Poll
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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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let clear_color = egui::Rgba::from_rgb(0.1, 0.3, 0.2);
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unsafe {
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use glow::HasContext;
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gl.clear_color(
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clear_color[0],
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clear_color[1],
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clear_color[2],
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clear_color[3],
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);
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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.paint(&gl_window, &gl, shapes);
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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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if egui.is_quit_event(&event) {
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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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}
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egui.on_event(&event);
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gl_window.window().request_redraw(); // TODO: 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.destroy(&gl);
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}
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_ => (),
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}
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});
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}
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