Support mono devices in WebXR

modules/webxr/godot_webxr.h

@@ -61,6 +61,7 @@ extern void godot_webxr_initialize(
 		GodotWebXRSimpleEventCallback p_on_simple_event);
 extern void godot_webxr_uninitialize();
 
+extern int godot_webxr_get_view_count();
 extern int *godot_webxr_get_render_targetsize();
 extern float *godot_webxr_get_transform_for_eye(int p_eye);
 extern float *godot_webxr_get_projection_for_eye(int p_eye);

modules/webxr/native/library_godot_webxr.js

@@ -394,6 +394,15 @@ const GodotWebXR = {
 		GodotWebXR.pauseResumeMainLoop();
 	},
 
+	godot_webxr_get_view_count__proxy: 'sync',
+	godot_webxr_get_view_count__sig: 'i',
+	godot_webxr_get_view_count: function () {
+		if (!GodotWebXR.session || !GodotWebXR.pose) {
+			return 0;
+		}
+		return GodotWebXR.pose.views.length;
+	},
+
 	godot_webxr_get_render_targetsize__proxy: 'sync',
 	godot_webxr_get_render_targetsize__sig: 'i',
 	godot_webxr_get_render_targetsize: function () {

modules/webxr/webxr_interface_js.cpp

@@ -197,12 +197,11 @@ StringName WebXRInterfaceJS::get_name() const {
 };
 
 int WebXRInterfaceJS::get_capabilities() const {
-	return XRInterface::XR_STEREO;
+	return XRInterface::XR_STEREO | XRInterface::XR_MONO;
 };
 
 bool WebXRInterfaceJS::is_stereo() {
-	// @todo WebXR can be mono! So, how do we know? Count the views in the frame?
-	return true;
+	return godot_webxr_get_view_count() == 2;
 };
 
 bool WebXRInterfaceJS::is_initialized() const {