203d571c8b
* Define NativeTexture trait for offscreen rendering add demo for NativeTexture trait * write changelog * add comment for native texture example * formatting * add license of Rust logo * NativeTexture trait method rename remove duplicate function with native texture remove rust logo * deprecated notice for register_glium_texture,register_webgl_texture * collect deprecated notice
111 lines
3.8 KiB
Rust
111 lines
3.8 KiB
Rust
//! Example how to use [epi::NativeTexture] with glium.
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use epi::NativeTexture;
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use glium::glutin;
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use std::io::Cursor;
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fn create_display(event_loop: &glutin::event_loop::EventLoop<()>) -> glium::Display {
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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_glium example");
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let context_builder = 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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glium::Display::new(window_builder, context_builder, event_loop).unwrap()
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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 display = create_display(&event_loop);
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let mut egui = egui_glium::EguiGlium::new(&display);
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//load image by image crate
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let image = image::load(
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Cursor::new(&include_bytes!("../../eframe/examples/rust-logo-512x512.png")[..]),
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image::ImageFormat::Png,
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)
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.unwrap()
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.to_rgba8();
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let image_dimensions = image.dimensions();
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//mark as image
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let image = glium::texture::RawImage2d::from_raw_rgba(image.into_raw(), image_dimensions);
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//load to gpu memory
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let native_texture = glium::texture::SrgbTexture2d::new(&display, image).unwrap();
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//allocate egui's texture id for GL texture
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let texture_id = egui.painter_mut().register_native_texture(native_texture);
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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(&display);
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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("");
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if ui.button("Quit").clicked() {
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quit = true;
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}
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});
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egui::Window::new("NativeTextureDisplay").show(egui.ctx(), |ui| {
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ui.image(texture_id, egui::Vec2::new(128.0, 128.0));
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});
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let (needs_repaint, shapes) = egui.end_frame(&display);
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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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display.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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use glium::Surface as _;
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let mut target = display.draw();
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let clear_color = egui::Rgba::from_rgb(0.1, 0.3, 0.2);
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target.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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// draw things behind egui here
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egui.paint(&display, &mut target, shapes);
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// draw things on top of egui here
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target.finish().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 = glium::glutin::event_loop::ControlFlow::Exit;
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}
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egui.on_event(&event);
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display.gl_window().window().request_redraw(); // TODO: ask egui if the events warrants a repaint instead
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}
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_ => (),
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}
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});
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}
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