egui_macroquad/
lib.rs

1//! # egui bindings for macroquad
2//!
3//! This is the easiest way to use egui. Just two functions!
4//!
5//! [Web demo.](https://optozorax.github.io/egui-macroquad/)
6//!
7//! # Usage
8//!
9//! You need to call [`ui`] when you need to get information from ui. Then, only after that function you must call [`draw`] function when you need to draw egui contents. All this functions should be called each frame and once per frame.
10//!
11//! Here is the small example on how to use this library:
12//! ```rust
13//! use macroquad::prelude::*;
14//!
15//! #[macroquad::main("egui with macroquad")]
16//! async fn main() {
17//!     loop {
18//!         clear_background(WHITE);
19//!
20//!         // Process keys, mouse etc.
21//!
22//!         egui_macroquad::ui(|egui_ctx| {
23//!             egui::Window::new("egui ❤ macroquad")
24//!                 .show(egui_ctx, |ui| {
25//!                     ui.label("Test");
26//!                 });
27//!         });
28//!
29//!         // Draw things before egui
30//!
31//!         egui_macroquad::draw();
32//!
33//!         // Draw things after egui
34//!
35//!         next_frame().await;
36//!     }
37//! }
38//! ```
39//!
40//! # Building
41//!
42//! Building for native and for web works just as in `macroquad`. You can read about it [here](https://github.com/not-fl3/miniquad/#building-examples). Or you could look at building example at [egui-miniquad](https://github.com/not-fl3/egui-miniquad).
43//!
44//! But for wasm you will need to include two more `.js` files, which is plugins for quads, instruction is written [here](https://github.com/optozorax/quad-url).
45
46use egui_miniquad::EguiMq;
47use macroquad::prelude::*;
48use miniquad as mq;
49
50pub use egui;
51pub use macroquad;
52
53struct Egui {
54    egui_mq: EguiMq,
55    input_subscriber_id: usize,
56}
57
58// Global variable and global functions because it's more like macroquad way
59static mut EGUI: Option<Egui> = None;
60
61fn get_egui() -> &'static mut Egui {
62    unsafe {
63        if let Some(egui) = EGUI.as_mut() {
64            egui
65        } else {
66            EGUI = Some(Egui::new());
67            EGUI.as_mut().unwrap()
68        }
69    }
70}
71
72impl Egui {
73    fn new() -> Self {
74        Self {
75            egui_mq: EguiMq::new(unsafe { get_internal_gl() }.quad_context),
76            input_subscriber_id: macroquad::input::utils::register_input_subscriber(),
77        }
78    }
79
80    fn ui<F>(&mut self, f: F)
81    where
82        F: FnMut(&mut dyn mq::RenderingBackend, &egui::Context),
83    {
84        let gl = unsafe { get_internal_gl() };
85        macroquad::input::utils::repeat_all_miniquad_input(self, self.input_subscriber_id);
86
87        self.egui_mq.run(gl.quad_context, f);
88    }
89
90    fn draw(&mut self) {
91        let mut gl = unsafe { get_internal_gl() };
92        // Ensure that macroquad's shapes are not goint to be lost, and draw them now
93        gl.flush();
94        self.egui_mq.draw(gl.quad_context);
95    }
96}
97
98/// Calculates egui ui. Must be called once per frame.
99pub fn ui<F: FnMut(&egui::Context)>(mut f: F) {
100    get_egui().ui(|_, ctx| f(ctx))
101}
102
103/// Configure egui without beginning or ending a frame.
104pub fn cfg<F: FnOnce(&egui::Context)>(f: F) {
105    f(get_egui().egui_mq.egui_ctx());
106}
107
108/// Draw egui ui. Must be called after `ui` and once per frame.
109pub fn draw() {
110    get_egui().draw()
111}
112
113// Intended to be used only if you recreate the window, making the old EGUI instance invalid.
114#[doc(hidden)]
115pub fn reset_egui() {
116    unsafe {
117        EGUI = None;
118    }
119}
120
121impl mq::EventHandler for Egui {
122    fn update(&mut self) {}
123
124    fn draw(&mut self) {}
125
126    fn mouse_motion_event(&mut self, x: f32, y: f32) {
127        self.egui_mq.mouse_motion_event(x, y);
128    }
129
130    fn mouse_wheel_event(&mut self, dx: f32, dy: f32) {
131        #[cfg(not(target_arch = "wasm32"))]
132        self.egui_mq.mouse_wheel_event(dx / 90., dy / 90.);
133
134        #[cfg(target_arch = "wasm32")]
135        self.egui_mq.mouse_wheel_event(dx / 30., dy / 30.);
136    }
137
138    fn mouse_button_down_event(&mut self, mb: mq::MouseButton, x: f32, y: f32) {
139        self.egui_mq.mouse_button_down_event(mb, x, y);
140    }
141
142    fn mouse_button_up_event(&mut self, mb: mq::MouseButton, x: f32, y: f32) {
143        self.egui_mq.mouse_button_up_event(mb, x, y);
144    }
145
146    fn char_event(&mut self, character: char, _keymods: mq::KeyMods, _repeat: bool) {
147        self.egui_mq.char_event(character);
148    }
149
150    fn key_down_event(&mut self, keycode: mq::KeyCode, keymods: mq::KeyMods, _repeat: bool) {
151        self.egui_mq.key_down_event(keycode, keymods);
152    }
153
154    fn key_up_event(&mut self, keycode: mq::KeyCode, keymods: mq::KeyMods) {
155        self.egui_mq.key_up_event(keycode, keymods);
156    }
157}
egui_macroquad/lib.rs

egui_macroquad/
lib.rs
