api changes

xr_api/src/api.rs

@@ -7,8 +7,12 @@ use crate::prelude::*;
 pub struct Entry(Rc<dyn EntryTrait>);
 
 impl Entry {
+    /// Constructs a new Xr entry
     pub fn new() -> Self {
-        todo!()
+        #[cfg(target_family = "wasm")]
+        return crate::backend::webxr::WebXrEntry::new().into();
+        #[cfg(not(target_family = "wasm"))]
+        return crate::backend::oxr::OXrEntry::new().into();
     }
 }
 
@@ -18,6 +22,9 @@ pub struct Instance(Rc<dyn InstanceTrait>);
 #[derive(Clone)]
 pub struct Session(Rc<dyn SessionTrait>);
 
+#[derive(Clone)]
+pub struct View(Rc<dyn ViewTrait>);
+
 #[derive(Clone)]
 pub struct Input(Rc<dyn InputTrait>);
 
@@ -48,6 +55,14 @@ impl Deref for Session {
     }
 }
 
+impl Deref for View {
+    type Target = dyn ViewTrait;
+
+    fn deref(&self) -> &Self::Target {
+        &*self.0
+    }
+}
+
 impl Deref for Input {
     type Target = dyn InputTrait;
 
@@ -86,6 +101,12 @@ impl<T: SessionTrait + 'static> From<T> for Session {
     }
 }
 
+impl<T: ViewTrait + 'static> From<T> for View {
+    fn from(value: T) -> Self {
+        Self(Rc::new(value))
+    }
+}
+
 impl<T: InputTrait + 'static> From<T> for Input {
     fn from(value: T) -> Self {
         Self(Rc::new(value))

xr_api/src/api_traits.rs

@@ -32,6 +32,15 @@ pub trait SessionTrait {
     fn end_frame(&self) -> Result<()>;
 }
 
+pub trait ViewTrait {
+    /// Returns the [TextureView] used to render this view.
+    fn texture_view(&self) -> TextureView;
+    /// Returns the [Pose] representing the current position of this view.
+    fn pose(&self) -> Pose;
+    /// Returns the projection matrix for the current view.
+    fn projection_matrix(&self) -> glam::Mat4;
+}
+
 pub trait InputTrait {
     /// Get the haptic action at the specified path.
     fn get_haptics(&self, path: ActionId) -> Result<Action<Haptic>>;

xr_api/src/backend/webxr.rs

@@ -16,6 +16,17 @@ use utils::*;
 #[derive(Clone)]
 pub struct WebXrEntry(web_sys::XrSystem);
 
+impl WebXrEntry {
+    pub fn new() -> Self {
+        Self(
+            web_sys::window()
+                .expect("No window available in current environment")
+                .navigator()
+                .xr(),
+        )
+    }
+}
+
 impl EntryTrait for WebXrEntry {
     fn available_extensions(&self) -> Result<ExtensionSet> {
         Ok(ExtensionSet::default())
@@ -45,7 +56,7 @@ impl InstanceTrait for WebXrInstance {
         self.exts
     }
 
-    fn create_session(&self, info: SessionCreateInfo) -> Result<Session> {
+    fn create_session(&self, _info: SessionCreateInfo) -> Result<Session> {
         Ok(WebXrSession {
             instance: self.clone().into(),
             session: self
@@ -170,15 +181,15 @@ impl InputTrait for WebXrInput {
         Ok(WebXrHaptics(haptics, path).into())
     }
 
-    fn get_pose(&self, path: ActionId) -> Result<Action<Pose>> {
+    fn get_pose(&self, _path: ActionId) -> Result<Action<Pose>> {
         todo!()
     }
 
-    fn get_float(&self, path: ActionId) -> Result<Action<f32>> {
+    fn get_float(&self, _path: ActionId) -> Result<Action<f32>> {
         todo!()
     }
 
-    fn get_bool(&self, path: ActionId) -> Result<Action<bool>> {
+    fn get_bool(&self, _path: ActionId) -> Result<Action<bool>> {
         todo!()
     }
 }

xr_api/src/error.rs

@@ -10,7 +10,7 @@ pub enum XrError {
 }
 
 impl Display for XrError {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+    fn fmt(&self, _f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         todo!()
     }
 }