move to api crate

xr_api/src/backend/oxr.rs

@@ -0,0 +1,30 @@
+use crate::prelude::*;
+
+pub struct OXrEntry(openxr::Entry);
+
+impl EntryTrait for OXrEntry {
+    fn available_extensions(&self) -> Result<ExtensionSet> {
+        // self.0.enumerate_extensions();
+        Ok(ExtensionSet::default())
+    }
+
+    fn create_instance(&self, exts: ExtensionSet) -> Result<Instance> {
+        todo!()
+    }
+}
+
+pub struct OXrInstance(openxr::Instance);
+
+impl InstanceTrait for OXrInstance {
+    fn entry(&self) -> Entry {
+        OXrEntry(self.0.entry().clone()).into()
+    }
+
+    fn enabled_extensions(&self) -> ExtensionSet {
+        todo!()
+    }
+
+    fn create_session(&self, info: SessionCreateInfo) -> Result<Session> {
+        todo!()
+    }
+}