Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Add Shape::Callback to do custom rendering inside of an egui UI (#1351)
* Add Shape::Callback to do custom rendering inside of an egui UI * Use Rc<glow::Context> everywhere * Remove trait WebPainter * Add glow::Context to epi::App::setup
- Loading branch information
Showing
34 changed files
with
776 additions
and
384 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Some generated files are not rendered by default. Learn more about how customized files appear on GitHub.
Oops, something went wrong.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| 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(painter) = render_ctx.downcast_ref::<egui_glow::Painter>() { | ||
| let mut rotating_triangle = rotating_triangle.lock(); | ||
| let rotating_triangle = rotating_triangle | ||
| .get_or_insert_with(|| RotatingTriangle::new(painter.gl())); | ||
| rotating_triangle.paint(painter.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); | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Oops, something went wrong.