renaming session supported function

src/Cameras/XR/webXREnterExitUI.ts

@@ -80,7 +80,7 @@ export class WebXREnterExitUI implements IDisposable {
     public static CreateAsync(scene: Scene, helper: WebXRExperienceHelper, options: WebXREnterExitUIOptions): Promise<WebXREnterExitUI> {
         var ui = new WebXREnterExitUI(scene, options);
         var supportedPromises = ui._buttons.map((btn) => {
-            return helper.sessionManager.supportsSessionAsync(btn.sessionMode);
+            return helper.sessionManager.isSessionSupportedAsync(btn.sessionMode);
         });
         helper.onStateChangedObservable.add((state) => {
             if (state == WebXRState.NOT_IN_XR) {

src/Cameras/XR/webXRExperienceHelper.ts

@@ -100,13 +100,16 @@ export class WebXRExperienceHelper implements IDisposable {
      */
     public enterXRAsync(sessionMode: XRSessionMode, referenceSpaceType: XRReferenceSpaceType, renderTarget: WebXRRenderTarget = this.sessionManager.getWebXRRenderTarget()): Promise<WebXRSessionManager> {
         if (!this._supported) {
-            throw "XR session not supported by this browser";
+            throw "XR not available";
         }
         this._setState(WebXRState.ENTERING_XR);
         let sessionCreationOptions = {
             optionalFeatures: (referenceSpaceType !== "viewer" && referenceSpaceType !== "local") ? [referenceSpaceType] : []
         };
-        return this.sessionManager.initializeSessionAsync(sessionMode, sessionCreationOptions).then(() => {
+        // make sure that the session mode is supported
+        return this.sessionManager.isSessionSupportedAsync(sessionMode).then(() => {
+            return this.sessionManager.initializeSessionAsync(sessionMode, sessionCreationOptions);
+        }).then(() => {
             return this.sessionManager.setReferenceSpaceAsync(referenceSpaceType);
         }).then(() => {
             return renderTarget.initializeXRLayerAsync(this.sessionManager.session);

src/Cameras/XR/webXRSessionManager.ts

@@ -120,7 +120,7 @@ export class WebXRSessionManager implements IDisposable {
         // Check if the browser supports webXR
         this._xrNavigator = navigator;
         if (!this._xrNavigator.xr) {
-            return Promise.reject("webXR not supported by this browser");
+            return Promise.reject("WebXR not available");
         }
         return Promise.resolve();
     }
@@ -269,7 +269,7 @@ export class WebXRSessionManager implements IDisposable {
      * @param sessionMode session mode to check if supported eg. immersive-vr
      * @returns true if supported
      */
-    public supportsSessionAsync(sessionMode: XRSessionMode) {
+    public isSessionSupportedAsync(sessionMode: XRSessionMode) {
         return WebXRSessionManager.IsSessionSupportedAsync(sessionMode);
     }