src/app/statistics_reporter.rs

@@ -1,31 +0,0 @@
-use log::info;
-
-pub struct StatisticsReporter {
-    total_time_seconds: f64,
-    frame_count: u32,
-}
-
-impl StatisticsReporter {
-    pub fn new() -> Self {
-        let total_time_seconds = 0.0;
-        let frame_count = 0;
-        Self {
-            total_time_seconds,
-            frame_count,
-        }
-    }
-
-    pub fn log_frame_time_seconds(&mut self, t: f64) {
-        self.total_time_seconds += t;
-        self.frame_count += 1;
-        if self.total_time_seconds >= 1.0 {
-            info!(
-                "Average frame time: {:.0} ms ({:.1} fps)",
-                self.total_time_seconds * 1000.0 / (self.frame_count as f64),
-                (self.frame_count as f64) / self.total_time_seconds
-            );
-            self.total_time_seconds = 0.0;
-            self.frame_count = 0;
-        }
-    }
-}

src/lib.rs

@@ -23,6 +23,6 @@ pub fn main() {
 
 #[cfg(target_arch = "wasm32")]
 #[wasm_bindgen]
-pub async fn init_pteropus() -> Result<wasm::PteropusCanvas, wasm::PteropusInitError> {
+pub async fn init_pteropus() -> wasm::PteropusCanvas {
     run(App::new(), Rc::new(Model::new())).await
 }

src/wasm/mod.rs

@@ -9,7 +9,7 @@ use {
 use crate::{
     app::{App, Model},
     mvu,
-    mvu::{Event, MvuApp, Size2i},
+    mvu::{Event, File, MvuApp, Size2i},
 };
 
 struct FrameTimer {
@@ -52,23 +52,9 @@ pub struct PteropusCanvas {
     model: Rc<Model>,
 }
 
-#[wasm_bindgen(getter_with_clone)]
-#[derive(Clone)]
-pub struct PteropusInitError {
-    pub message: String,
-}
-
-impl PteropusInitError {
-    fn new<M: Into<String>>(message: M) -> Self {
-        Self {
-            message: message.into(),
-        }
-    }
-}
-
 #[wasm_bindgen]
 impl PteropusCanvas {
-    async fn init(&self) -> Result<(), PteropusInitError> {
+    async fn init(&self) {
         let html_canvas = self.get_canvas();
         let size = Size2i {
             width: html_canvas.client_width() as u32,
@@ -76,17 +62,15 @@ impl PteropusCanvas {
         };
         let instance = wgpu::Instance::default();
         let surface_target = SurfaceTarget::Canvas(html_canvas);
-        let surface = instance.create_surface(surface_target).map_err(|_| {
-            PteropusInitError::new(
-                "Could not initialize canvas. This browser may not support WebGPU.",
-            )
-        })?;
+        let surface = instance
+            .create_surface(surface_target)
+            .expect("create graphics surface for canvas");
+
         self.app
             .lock()
             .expect("get app mutex")
             .init(&instance, surface, size, Box::new(FrameTimer::new()))
             .await;
-        Ok(())
     }
 
     #[wasm_bindgen]
@@ -150,11 +134,11 @@ impl PteropusCanvas {
     }
 }
 
-pub async fn run(app: App, model: Rc<Model>) -> Result<PteropusCanvas, PteropusInitError> {
+pub async fn run(app: App, model: Rc<Model>) -> PteropusCanvas {
     let app = Rc::new(Mutex::new(app));
     std::panic::set_hook(Box::new(console_error_panic_hook::hook));
     console_log::init_with_level(log::Level::Info).expect("Couldn't initialize logger");
     let pteropus_canvas = PteropusCanvas { app, model };
-    pteropus_canvas.init().await?;
-    Ok(pteropus_canvas)
+    pteropus_canvas.init().await;
+    pteropus_canvas
 }

web/pteropus-frame.js

@@ -1,4 +1,4 @@
-import init, {init_pteropus, PteropusInitError} from '../pkg/pteropus.js';
+import init, {init_pteropus} from '../pkg/pteropus.js';
 
 function fileDragOverHandler(event) {
     event.preventDefault();
@@ -7,26 +7,13 @@ function fileDragOverHandler(event) {
 async function run() {
     await init();
 
-    try {
     let pteropus = await init_pteropus();
-    } catch(e) {
-        const errorParagraph = document.createElement("p");
-        if(e instanceof PteropusInitError) {
-            const errorMessage = document.createTextNode(e.message);
-            errorParagraph.appendChild(errorMessage);
-        } else {
-            const errorMessage = document.createTextNode("Something unexpected happened.");
-            errorParagraph.appendChild(errorMessage);
-        }
-        document.getElementById("whole-window").replaceWith(errorParagraph);
-        return;
-    }
 
     let test_file_data = null;
     let needs_resize = true;
     let clear_scene = false;
 
-    const mainCanvas = document.getElementById("pteropus-canvas");
+    let mainCanvas = document.getElementById("pteropus-canvas");
     mainCanvas.addEventListener("drop", async (event) => {
         event.preventDefault();
         test_file_data = event.dataTransfer.files[0]
@@ -37,7 +24,7 @@ async function run() {
     });
     resizeObserver.observe(mainCanvas);
 
-    const fileUploadButton = document.getElementById("file-upload-file-input");
+    let fileUploadButton = document.getElementById("file-upload-file-input");
     fileUploadButton.addEventListener("change", () => {
         const files = fileUploadButton.files;
         if(files.length > 0) {
@@ -45,7 +32,7 @@ async function run() {
         }
     });
 
-    const clearSceneButton = document.getElementById("clear-scene-button");
+    let clearSceneButton = document.getElementById("clear-scene-button");
     clearSceneButton.addEventListener("click", () => {
         clear_scene = true;
     });