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Add Shape::Callback to do custom rendering inside of an egui UI
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,193 @@ | ||
| //! 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 callback = egui::epaint::PaintCallback { | ||
| 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(callback); | ||
| } | ||
| } | ||
|
|
||
| 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 shaders: Vec<_> = shader_sources | ||
| .iter() | ||
| .map(|(shader_type, shader_source)| { | ||
| 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); | ||
| shader | ||
| }) | ||
| .collect(); | ||
|
|
||
| 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, | ||
| } | ||
| } | ||
| } | ||
|
|
||
| // TODO: figure out how to call this in a nice way | ||
| #[allow(unused)] | ||
| fn destroy(self, gl: &glow::Context) { | ||
| use glow::HasContext as _; | ||
| unsafe { | ||
| gl.delete_program(self.program); | ||
| gl.delete_vertex_array(self.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); | ||
| } |
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