1 files changed, 72 insertions, 0 deletions
diff --git a/bindgen/rust/src/egui_utils.rs b/bindgen/rust/src/egui_utils.rs
new file mode 100644
index 0000000..b29e271
--- /dev/null
+++ b/bindgen/rust/src/egui_utils.rs
@@ -0,0 +1,72 @@
+use egui_overlay::{EguiOverlay, OverlayApp};
+use egui_render_three_d::ThreeDBackend;
+use egui_window_glfw_passthrough::glfw::Context;
+use egui_window_glfw_passthrough::{GlfwBackend, GlfwConfig};
+
+use crate::Core_Bringup;
+
+// struct CustomEguiOverlay {
+//   backend:
+// }
+
+fn init() {
+    let mut glfw_backend = GlfwBackend::new(GlfwConfig::default());
+    let mut glfw_window_ptr = glfw_backend.window.window_ptr();
+
+    unsafe {
+        // Cast the window pointer to the expected type
+        let window_ptr = glfw_window_ptr as *mut crate::GLFWwindow;
+        Core_Bringup(window_ptr);
+    };
+}
+
+/// After implementing [`EguiOverlay`], just call this function with your app data
+pub fn start<T: EguiOverlay + 'static>(user_data: T) {
+    let mut glfw_backend = GlfwBackend::new(GlfwConfig {
+        // this closure will be called before creating a window
+        glfw_callback: Box::new(|gtx| {
+            // some defualt hints. it is empty atm, but in future we might add some convenience hints to it.
+            (egui_window_glfw_passthrough::GlfwConfig::default().glfw_callback)(gtx);
+            // scale the window size based on monitor scale. as 800x600 looks too small on a 4k screen, compared to a hd screen in absolute pixel sizes.
+            gtx.window_hint(egui_window_glfw_passthrough::glfw::WindowHint::ScaleToMonitor(true));
+        }),
+        opengl_window: Some(true), // macos doesn't support opengl.
+        transparent_window: Some(false),
+        window_title: "Celeritas egui".into(),
+        ..Default::default()
+    });
+
+    // always on top
+    // glfw_backend.window.set_floating(true);
+    // disable borders/titlebar
+    // glfw_backend.window.set_decorated(false);
+
+    let latest_size = glfw_backend.window.get_framebuffer_size();
+    let latest_size = [latest_size.0 as _, latest_size.1 as _];
+
+    let default_gfx_backend = {
+      ThreeDBackend::new(
+          egui_render_three_d::ThreeDConfig {
+              ..Default::default()
+          },
+          |s| glfw_backend.get_proc_address(s),
+          latest_size,
+      )
+  };
+
+    let glfw_window_ptr = glfw_backend.window.window_ptr();
+    unsafe {
+      // Cast the window pointer to the expected type
+      let window_ptr = glfw_window_ptr as *mut crate::GLFWwindow;
+      Core_Bringup(window_ptr);
+    };
+
+    let overlap_app = OverlayApp {
+        user_data,
+        egui_context: Default::default(),
+        default_gfx_backend,
+        glfw_backend,
+    };
+
+    overlap_app.enter_event_loop();
+}