expose OpenXR hand tracker handles

modules/openxr/doc_classes/OpenXRAPIExtension.xml

@@ -30,6 +30,13 @@
 				Returns an error string for the given [url=https://registry.khronos.org/OpenXR/specs/1.0/man/html/XrResult.html]XrResult[/url].
 			</description>
 		</method>
+		<method name="get_hand_tracker">
+			<return type="int" />
+			<param index="0" name="hand_index" type="int" />
+			<description>
+				Returns the corresponding [code]XRHandTrackerEXT[/code] handle for the given hand index value.
+			</description>
+		</method>
 		<method name="get_instance">
 			<return type="int" />
 			<description>

modules/openxr/openxr_api.cpp

@@ -57,6 +57,7 @@
 #include "extensions/openxr_fb_display_refresh_rate_extension.h"
 #include "extensions/openxr_fb_foveation_extension.h"
 #include "extensions/openxr_fb_update_swapchain_extension.h"
+#include "extensions/openxr_hand_tracking_extension.h"
 
 #ifdef ANDROID_ENABLED
 #define OPENXR_LOADER_NAME "libopenxr_loader.so"
@@ -1536,6 +1537,12 @@ void OpenXRAPI::cleanup_extension_wrappers() {
 	registered_extension_wrappers.clear();
 }
 
+XrHandTrackerEXT OpenXRAPI::get_hand_tracker(int p_hand_index) {
+	ERR_FAIL_INDEX_V(p_hand_index, OpenXRHandTrackingExtension::HandTrackedHands::OPENXR_MAX_TRACKED_HANDS, XR_NULL_HANDLE);
+	OpenXRHandTrackingExtension::HandTrackedHands hand = static_cast<OpenXRHandTrackingExtension::HandTrackedHands>(p_hand_index);
+	return OpenXRHandTrackingExtension::get_singleton()->get_hand_tracker(hand)->hand_tracker;
+}
+
 Size2 OpenXRAPI::get_recommended_target_size() {
 	ERR_FAIL_NULL_V(view_configuration_views, Size2());
 

modules/openxr/openxr_api.h

@@ -359,6 +359,8 @@ public:
 	XrTime get_next_frame_time() { return frame_state.predictedDisplayTime + frame_state.predictedDisplayPeriod; }
 	bool can_render() { return instance != XR_NULL_HANDLE && session != XR_NULL_HANDLE && running && view_pose_valid && frame_state.shouldRender; }
 
+	XrHandTrackerEXT get_hand_tracker(int p_hand_index);
+
 	Size2 get_recommended_target_size();
 	XRPose::TrackingConfidence get_head_center(Transform3D &r_transform, Vector3 &r_linear_velocity, Vector3 &r_angular_velocity);
 	bool get_view_transform(uint32_t p_view, Transform3D &r_transform);

modules/openxr/openxr_api_extension.cpp

@@ -51,6 +51,8 @@ void OpenXRAPIExtension::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("get_next_frame_time"), &OpenXRAPIExtension::get_next_frame_time);
 	ClassDB::bind_method(D_METHOD("can_render"), &OpenXRAPIExtension::can_render);
 
+	ClassDB::bind_method(D_METHOD("get_hand_tracker", "hand_index"), &OpenXRAPIExtension::get_hand_tracker);
+
 	ClassDB::bind_method(D_METHOD("register_composition_layer_provider", "extension"), &OpenXRAPIExtension::register_composition_layer_provider);
 	ClassDB::bind_method(D_METHOD("unregister_composition_layer_provider", "extension"), &OpenXRAPIExtension::unregister_composition_layer_provider);
 
@@ -138,6 +140,11 @@ bool OpenXRAPIExtension::can_render() {
 	return OpenXRAPI::get_singleton()->can_render();
 }
 
+uint64_t OpenXRAPIExtension::get_hand_tracker(int p_hand_index) {
+	ERR_FAIL_NULL_V(OpenXRAPI::get_singleton(), 0);
+	return (uint64_t)OpenXRAPI::get_singleton()->get_hand_tracker(p_hand_index);
+}
+
 void OpenXRAPIExtension::register_composition_layer_provider(OpenXRExtensionWrapperExtension *p_extension) {
 	ERR_FAIL_NULL(OpenXRAPI::get_singleton());
 	OpenXRAPI::get_singleton()->register_composition_layer_provider(p_extension);

modules/openxr/openxr_api_extension.h

@@ -72,6 +72,8 @@ public:
 	int64_t get_next_frame_time();
 	bool can_render();
 
+	uint64_t get_hand_tracker(int p_hand_index);
+
 	void register_composition_layer_provider(OpenXRExtensionWrapperExtension *p_extension);
 	void unregister_composition_layer_provider(OpenXRExtensionWrapperExtension *p_extension);