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Improve native_texture.rs demo

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This commit is contained in:
Emil Ernerfeldt 2021-09-20 22:39:44 +02:00
parent a5a5d6176d
commit cfb6b31914
1 changed files with 25 additions and 14 deletions
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39
egui_glium/examples/native_texture.rs
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@ -1,7 +1,6 @@
//! Example how to use [epi::NativeTexture] with glium.
use epi::NativeTexture;
use glium::glutin;
use std::io::Cursor;
fn create_display(event_loop: &glutin::event_loop::EventLoop<()>) -> glium::Display {
let window_builder = glutin::window::WindowBuilder::new()
@ -21,25 +20,37 @@ fn create_display(event_loop: &glutin::event_loop::EventLoop<()>) -> glium::Disp
glium::Display::new(window_builder, context_builder, event_loop).unwrap()
}
fn load_glium_image(png_data: &[u8]) -> glium::texture::RawImage2d<u8> {
// Load image using the image crate:
let image = image::load_from_memory(png_data).unwrap().to_rgba8();
let image_dimensions = image.dimensions();
// Premultiply alpha:
let pixels: Vec<_> = image
.into_vec()
.chunks_exact(4)
.map(|p| egui::Color32::from_rgba_unmultiplied(p[0], p[1], p[2], p[3]))
.flat_map(|color| color.to_array())
.collect();
// Convert to glium image:
glium::texture::RawImage2d::from_raw_rgba(pixels, image_dimensions)
}
fn main() {
let event_loop = glutin::event_loop::EventLoop::with_user_event();
let display = create_display(&event_loop);
let mut egui = egui_glium::EguiGlium::new(&display);
//load image by image crate
let image = image::load(
Cursor::new(&include_bytes!("../../eframe/examples/rust-logo-256x256.png")[..]),
image::ImageFormat::Png,
)
.unwrap()
.to_rgba8();
let image_dimensions = image.dimensions();
//mark as image
let image = glium::texture::RawImage2d::from_raw_rgba(image.into_raw(), image_dimensions);
//load to gpu memory
let png_data = include_bytes!("../../eframe/examples/rust-logo-256x256.png");
let image = load_glium_image(png_data);
let image_size = egui::Vec2::new(image.width as f32, image.height as f32);
// Load to gpu memory
let native_texture = glium::texture::SrgbTexture2d::new(&display, image).unwrap();
//allocate egui's texture id for GL texture
// Allocate egui's texture id for GL texture
let texture_id = egui.painter_mut().register_native_texture(native_texture);
event_loop.run(move |event, _, control_flow| {
let mut redraw = || {
egui.begin_frame(&display);
@ -53,7 +64,7 @@ fn main() {
}
});
egui::Window::new("NativeTextureDisplay").show(egui.ctx(), |ui| {
ui.image(texture_id, egui::Vec2::new(128.0, 128.0));
ui.image(texture_id, image_size);
});
let (needs_repaint, shapes) = egui.end_frame(&display);