add Support for XR anchors

Packages/webxr/CHANGELOG.md

@@ -13,6 +13,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Hands tracking update.
 - Flickering on touch input in immersive WebXR sessions by queueing synthesized touch events and dispatching them during the XR animation frame.
 
+### Added
+- WebXR Anchors: Session anchor support for immersive AR sessions, including creating anchors from viewer hit-test results or Unity poses and receiving per-frame anchor pose updates.
+- WebXR Anchors: To use anchors, enable the `anchors` optional feature in WebXR AR settings and see samples for usage.
+
 ## [0.22.1] - 2024-11-09
 ### Added
 - Support for WebAssembly Table, to support newer Unity versions features.

Packages/webxr/Runtime/Plugins/WebGL/webxr.jslib

@@ -29,6 +29,35 @@ var LibraryWebXR = {
     Module.HandsArrayOffset = byteOffset / 4;
   },
 
+  InitAnchorsArray: function(byteOffset) {
+    Module.AnchorsArrayOffset = byteOffset / 4;
+  },
+
+  SetWebXRAnchorEvents: function(onAnchorCreatedPtr, onAnchorDeletedPtr) {
+    Module.WebXR.onAnchorCreatedPtr = onAnchorCreatedPtr;
+    Module.WebXR.onAnchorDeletedPtr = onAnchorDeletedPtr;
+  },
+
+  CreateAnchorFromViewerHitTest: function() {
+    Module.WebXR.createAnchorFromViewerHitTest();
+  },
+
+  CreateAnchorFromWaitingForViewerHitTest: function() {
+    Module.WebXR.createAnchorFromWaitingForViewerHitTest();
+  },
+
+  CreateAnchorFromPose: function(px, py, pz, qx, qy, qz, qw) {
+    Module.WebXR.createAnchorFromPose(px, py, pz, qx, qy, qz, qw);
+  },
+
+  DeleteAnchor: function(anchorId) {
+    Module.WebXR.deleteAnchor(anchorId);
+  },
+
+  DeleteAllAnchors: function() {
+    Module.WebXR.deleteAllAnchors();
+  },
+
   InitViewerHitTestPoseArray: function(byteOffset) {
     Module.ViewerHitTestPoseArrayOffset = byteOffset / 4;
   },