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custom_3d.rs
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custom_3d.rs
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//! This demo shows how to embed 3D rendering using [`glow`](https://github.com/grovesNL/glow) in `eframe`.
//!
//! This is very advanced usage, and you need to be careful.
//!
//! If you want an easier way to show 3D graphics with egui, take a look at:
//! * [`bevy_egui`](https://github.com/mvlabat/bevy_egui)
//! * [`three-d`](https://github.com/asny/three-d)
#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")] // hide console window on Windows in release
use eframe::{egui, epi};
use parking_lot::Mutex;
use std::sync::Arc;
#[derive(Default)]
struct MyApp {
rotating_triangle: Arc<Mutex<Option<RotatingTriangle>>>,
angle: f32,
}
impl epi::App for MyApp {
fn name(&self) -> &str {
"Custom 3D painting inside an egui window"
}
fn update(&mut self, ctx: &egui::Context, _frame: &epi::Frame) {
egui::CentralPanel::default().show(ctx, |ui| {
ui.heading("Here is some 3D stuff:");
egui::ScrollArea::both().show(ui, |ui| {
egui::Frame::dark_canvas(ui.style()).show(ui, |ui| {
self.custom_painting(ui);
});
ui.label("Drag to rotate!");
});
});
let mut frame = egui::Frame::window(&*ctx.style());
frame.fill = frame.fill.linear_multiply(0.5); // transparent
egui::Window::new("3D stuff in a window")
.frame(frame)
.show(ctx, |ui| {
self.custom_painting(ui);
});
}
}
impl MyApp {
fn custom_painting(&mut self, ui: &mut egui::Ui) {
let (rect, response) =
ui.allocate_exact_size(egui::Vec2::splat(256.0), egui::Sense::drag());
self.angle += response.drag_delta().x * 0.01;
let angle = self.angle;
let rotating_triangle = self.rotating_triangle.clone();
let shape = egui::shape::CallbackShape {
rect,
callback: std::sync::Arc::new(move |render_ctx| {
if let Some(gl) = render_ctx.downcast_ref::<glow::Context>() {
let mut rotating_triangle = rotating_triangle.lock();
let rotating_triangle =
rotating_triangle.get_or_insert_with(|| RotatingTriangle::new(gl));
rotating_triangle.paint(gl, angle);
} else {
eprintln!("Can't do custom painting because we are not using a glow context");
}
}),
};
ui.painter().add(shape);
}
}
struct RotatingTriangle {
program: glow::Program,
vertex_array: glow::VertexArray,
}
impl RotatingTriangle {
fn new(gl: &glow::Context) -> Self {
use glow::HasContext as _;
let shader_version = if cfg!(target_arch = "wasm32") {
"#version 300 es"
} else {
"#version 410"
};
unsafe {
let program = gl.create_program().expect("Cannot create program");
let (vertex_shader_source, fragment_shader_source) = (
r#"
const vec2 verts[3] = vec2[3](
vec2(0.0, 1.0),
vec2(-1.0, -1.0),
vec2(1.0, -1.0)
);
const vec4 colors[3] = vec4[3](
vec4(1.0, 0.0, 0.0, 1.0),
vec4(0.0, 1.0, 0.0, 1.0),
vec4(0.0, 0.0, 1.0, 1.0)
);
out vec4 v_color;
uniform float u_angle;
void main() {
v_color = colors[gl_VertexID];
gl_Position = vec4(verts[gl_VertexID], 0.0, 1.0);
gl_Position.x *= cos(u_angle);
}
"#,
r#"
precision mediump float;
in vec4 v_color;
out vec4 out_color;
void main() {
out_color = v_color;
}
"#,
);
let shader_sources = [
(glow::VERTEX_SHADER, vertex_shader_source),
(glow::FRAGMENT_SHADER, fragment_shader_source),
];
let mut shaders = Vec::with_capacity(shader_sources.len());
for (shader_type, shader_source) in shader_sources.iter() {
let shader = gl
.create_shader(*shader_type)
.expect("Cannot create shader");
gl.shader_source(shader, &format!("{}\n{}", shader_version, shader_source));
gl.compile_shader(shader);
if !gl.get_shader_compile_status(shader) {
panic!("{}", gl.get_shader_info_log(shader));
}
gl.attach_shader(program, shader);
shaders.push(shader);
}
gl.link_program(program);
if !gl.get_program_link_status(program) {
panic!("{}", gl.get_program_info_log(program));
}
for shader in shaders {
gl.detach_shader(program, shader);
gl.delete_shader(shader);
}
let vertex_array = gl
.create_vertex_array()
.expect("Cannot create vertex array");
Self {
program,
vertex_array,
}
}
}
fn paint(&self, gl: &glow::Context, angle: f32) {
use glow::HasContext as _;
unsafe {
gl.use_program(Some(self.program));
gl.uniform_1_f32(
gl.get_uniform_location(self.program, "u_angle").as_ref(),
angle,
);
gl.bind_vertex_array(Some(self.vertex_array));
gl.draw_arrays(glow::TRIANGLES, 0, 3);
}
}
}
fn main() {
let options = eframe::NativeOptions::default();
eframe::run_native(Box::new(MyApp::default()), options);
}