vendor

egui/crates/egui_glium/examples/pure_glium.rs

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+//! Example how to use `egui_glium`.
+
+#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")] // hide console window on Windows in release
+
+use glium::glutin;
+
+fn main() {
+    let event_loop = glutin::event_loop::EventLoopBuilder::with_user_event().build();
+    let display = create_display(&event_loop);
+
+    let mut egui_glium = egui_glium::EguiGlium::new(&display, &event_loop);
+
+    let mut color_test = egui_demo_lib::ColorTest::default();
+
+    event_loop.run(move |event, _, control_flow| {
+        let mut redraw = || {
+            let mut quit = false;
+
+            let repaint_after = egui_glium.run(&display, |egui_ctx| {
+                egui::SidePanel::left("my_side_panel").show(egui_ctx, |ui| {
+                    ui.heading("Hello World!");
+                    if ui.button("Quit").clicked() {
+                        quit = true;
+                    }
+                });
+
+                egui::CentralPanel::default().show(egui_ctx, |ui| {
+                    egui::ScrollArea::vertical().show(ui, |ui| {
+                        color_test.ui(ui);
+                    });
+                });
+            });
+
+            *control_flow = if quit {
+                glutin::event_loop::ControlFlow::Exit
+            } else if repaint_after.is_zero() {
+                display.gl_window().window().request_redraw();
+                glutin::event_loop::ControlFlow::Poll
+            } else if let Some(repaint_after_instant) =
+                std::time::Instant::now().checked_add(repaint_after)
+            {
+                glutin::event_loop::ControlFlow::WaitUntil(repaint_after_instant)
+            } else {
+                glutin::event_loop::ControlFlow::Wait
+            };
+
+            {
+                use glium::Surface as _;
+                let mut target = display.draw();
+
+                let color = egui::Rgba::from_rgb(0.1, 0.3, 0.2);
+                target.clear_color(color[0], color[1], color[2], color[3]);
+
+                // draw things behind egui here
+
+                egui_glium.paint(&display, &mut target);
+
+                // draw things on top of egui here
+
+                target.finish().unwrap();
+            }
+        };
+
+        match event {
+            // Platform-dependent event handlers to workaround a winit bug
+            // See: https://github.com/rust-windowing/winit/issues/987
+            // See: https://github.com/rust-windowing/winit/issues/1619
+            glutin::event::Event::RedrawEventsCleared if cfg!(windows) => redraw(),
+            glutin::event::Event::RedrawRequested(_) if !cfg!(windows) => redraw(),
+
+            glutin::event::Event::WindowEvent { event, .. } => {
+                use glutin::event::WindowEvent;
+                if matches!(event, WindowEvent::CloseRequested | WindowEvent::Destroyed) {
+                    *control_flow = glutin::event_loop::ControlFlow::Exit;
+                }
+
+                let event_response = egui_glium.on_event(&event);
+
+                if event_response.repaint {
+                    display.gl_window().window().request_redraw();
+                }
+            }
+            glutin::event::Event::NewEvents(glutin::event::StartCause::ResumeTimeReached {
+                ..
+            }) => {
+                display.gl_window().window().request_redraw();
+            }
+            _ => (),
+        }
+    });
+}
+
+fn create_display(event_loop: &glutin::event_loop::EventLoop<()>) -> glium::Display {
+    let window_builder = glutin::window::WindowBuilder::new()
+        .with_resizable(true)
+        .with_inner_size(glutin::dpi::LogicalSize {
+            width: 800.0,
+            height: 600.0,
+        })
+        .with_title("egui_glium example");
+
+    let context_builder = glutin::ContextBuilder::new()
+        .with_depth_buffer(0)
+        .with_stencil_buffer(0)
+        .with_vsync(true);
+
+    glium::Display::new(window_builder, context_builder, event_loop).unwrap()
+}