Spawn Bevy canvas at full viewport size

studio/src/viewport.rs

@@ -0,0 +1,37 @@
+use bevy::window::WindowResolution;
+use wasm_bindgen::prelude::*;
+
+#[wasm_bindgen]
+pub struct ViewportSize {
+    pub width: f32,
+    pub height: f32,
+}
+
+#[wasm_bindgen]
+impl ViewportSize {
+    #[wasm_bindgen(constructor)]
+    pub fn new(width: f32, height: f32) -> Self {
+        Self { width, height }
+    }
+}
+
+impl Default for ViewportSize {
+    fn default() -> Self {
+        WindowResolution::default().into()
+    }
+}
+
+impl From<ViewportSize> for WindowResolution {
+    fn from(value: ViewportSize) -> Self {
+        Self::new(value.width, value.height)
+    }
+}
+
+impl From<WindowResolution> for ViewportSize {
+    fn from(value: WindowResolution) -> Self {
+        Self {
+            width: value.width(),
+            height: value.height(),
+        }
+    }
+}