First commit

src/main.rs

@@ -0,0 +1,80 @@
+// Fractal Explorer — Rust + wgpu + egui + WGSL deep-zoom Mandelbrot.
+//
+// A single binary drives both native and web (WASM/WebGPU) builds; the two
+// `main` functions below are selected by target. Trunk builds the wasm32 target
+// and calls the wasm `main`, which boots eframe onto the page's <canvas>.
+
+mod app;
+mod fractal;
+mod view;
+
+#[cfg(not(target_arch = "wasm32"))]
+mod worker;
+
+use app::FractalApp;
+
+#[cfg(not(target_arch = "wasm32"))]
+fn main() -> eframe::Result {
+    env_logger::builder()
+        .filter_level(log::LevelFilter::Info)
+        .parse_default_env()
+        .init();
+
+    let native_options = eframe::NativeOptions {
+        renderer: eframe::Renderer::Wgpu,
+        viewport: egui::ViewportBuilder::default()
+            .with_inner_size([1280.0, 800.0])
+            .with_min_inner_size([640.0, 480.0])
+            .with_title("Fractal Explorer"),
+        ..Default::default()
+    };
+
+    eframe::run_native(
+        "Fractal Explorer",
+        native_options,
+        Box::new(|cc| Ok(Box::new(FractalApp::new(cc)))),
+    )
+}
+
+#[cfg(target_arch = "wasm32")]
+fn main() {
+    use eframe::wasm_bindgen::JsCast as _;
+
+    console_error_panic_hook::set_once();
+    let _ = console_log::init_with_level(log::Level::Info);
+
+    let web_options = eframe::WebOptions::default();
+
+    wasm_bindgen_futures::spawn_local(async {
+        let document = web_sys::window()
+            .expect("no window")
+            .document()
+            .expect("no document");
+        let canvas = document
+            .get_element_by_id("the_canvas_id")
+            .expect("missing element with id `the_canvas_id`")
+            .dyn_into::<web_sys::HtmlCanvasElement>()
+            .expect("`the_canvas_id` is not a <canvas>");
+
+        let result = eframe::WebRunner::new()
+            .start(
+                canvas,
+                web_options,
+                Box::new(|cc| Ok(Box::new(FractalApp::new(cc)))),
+            )
+            .await;
+
+        // Remove the "Loading…" splash regardless of success/failure.
+        if let Some(loading) = document.get_element_by_id("loading_text") {
+            match result {
+                Ok(_) => loading.remove(),
+                Err(e) => {
+                    loading.set_inner_html(
+                        "<p>The app has crashed. See the developer console for details.</p>",
+                    );
+                    log::error!("failed to start eframe: {e:?}");
+                }
+            }
+        }
+    });
+}