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OpenXR: Add support for hand tracking source extension

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This commit is contained in:
Bastiaan Olij 2023-11-22 17:00:32 +11:00
parent 9b522ac1a8
commit 4c806c03df
5 changed files with 118 additions and 11 deletions
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22
modules/openxr/doc_classes/OpenXRInterface.xml
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@ -71,6 +71,13 @@
If handtracking is enabled, returns the rotation of a joint ([param joint]) of a hand ([param hand]) as provided by OpenXR.
</description>
</method>
<method name="get_hand_tracking_source" qualifiers="const">
<return type="int" enum="OpenXRInterface.HandTrackedSource" />
<param index="0" name="hand" type="int" enum="OpenXRInterface.Hand" />
<description>
If handtracking is enabled and hand tracking source is supported, gets the source of the hand tracking data for [param hand].
</description>
</method>
<method name="get_motion_range" qualifiers="const">
<return type="int" enum="OpenXRInterface.HandMotionRange" />
<param index="0" name="hand" type="int" enum="OpenXRInterface.Hand" />
@ -177,10 +184,25 @@
Maximum value for the hand enum.
</constant>
<constant name="HAND_MOTION_RANGE_UNOBSTRUCTED" value="0" enum="HandMotionRange">
Full hand range, if user closes their hands, we make a full fist.
</constant>
<constant name="HAND_MOTION_RANGE_CONFORM_TO_CONTROLLER" value="1" enum="HandMotionRange">
Conform to controller, if user closes their hands, the tracked data conforms to the shape of the controller.
</constant>
<constant name="HAND_MOTION_RANGE_MAX" value="2" enum="HandMotionRange">
Maximum value for the motion range enum.
</constant>
<constant name="HAND_TRACKED_SOURCE_UNKNOWN" value="0" enum="HandTrackedSource">
The source of hand tracking data is unknown (the extension is likely unsupported).
</constant>
<constant name="HAND_TRACKED_SOURCE_UNOBSTRUCTED" value="1" enum="HandTrackedSource">
The source of hand tracking is unobstructed, this means that an accurate method of hand tracking is used, e.g. optical hand tracking, data gloves, etc.
</constant>
<constant name="HAND_TRACKED_SOURCE_CONTROLLER" value="2" enum="HandTrackedSource">
The source of hand tracking is a controller, bone positions are inferred from controller inputs.
</constant>
<constant name="HAND_TRACKED_SOURCE_MAX" value="3" enum="HandTrackedSource">
Maximum value for the hand tracked source enum.
</constant>
<constant name="HAND_JOINT_PALM" value="0" enum="HandJoints">
Palm joint.

57
modules/openxr/extensions/openxr_hand_tracking_extension.cpp
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@ -60,6 +60,7 @@ HashMap<String, bool *> OpenXRHandTrackingExtension::get_requested_extensions()
request_extensions[XR_EXT_HAND_TRACKING_EXTENSION_NAME] = &hand_tracking_ext;
request_extensions[XR_EXT_HAND_JOINTS_MOTION_RANGE_EXTENSION_NAME] = &hand_motion_range_ext;
request_extensions[XR_EXT_HAND_TRACKING_DATA_SOURCE_EXTENSION_NAME] = &hand_tracking_source_ext;
return request_extensions;
}
@ -137,20 +138,32 @@ void OpenXRHandTrackingExtension::on_process() {
for (int i = 0; i < OPENXR_MAX_TRACKED_HANDS; i++) {
if (hand_trackers[i].hand_tracker == XR_NULL_HANDLE) {
XrHandTrackerCreateInfoEXT createInfo = {
void *next_pointer = nullptr;
// Originally not all XR runtimes supported hand tracking data sourced both from controllers and normal hand tracking.
// With this extension we can indicate we accept input from both sources so hand tracking data is consistently provided
// on runtimes that support this.
XrHandTrackingDataSourceEXT data_sources[2] = { XR_HAND_TRACKING_DATA_SOURCE_UNOBSTRUCTED_EXT, XR_HAND_TRACKING_DATA_SOURCE_CONTROLLER_EXT };
XrHandTrackingDataSourceInfoEXT data_source_info = { XR_TYPE_HAND_TRACKING_DATA_SOURCE_INFO_EXT, next_pointer, 2, data_sources };
if (hand_tracking_source_ext) {
// If supported include this info
next_pointer = &data_source_info;
}
XrHandTrackerCreateInfoEXT create_info = {
XR_TYPE_HAND_TRACKER_CREATE_INFO_EXT, // type
nullptr, // next
next_pointer, // next
i == 0 ? XR_HAND_LEFT_EXT : XR_HAND_RIGHT_EXT, // hand
XR_HAND_JOINT_SET_DEFAULT_EXT, // handJointSet
};
result = xrCreateHandTrackerEXT(OpenXRAPI::get_singleton()->get_session(), &createInfo, &hand_trackers[i].hand_tracker);
result = xrCreateHandTrackerEXT(OpenXRAPI::get_singleton()->get_session(), &create_info, &hand_trackers[i].hand_tracker);
if (XR_FAILED(result)) {
// not successful? then we do nothing.
print_line("OpenXR: Failed to obtain hand tracking information [", OpenXRAPI::get_singleton()->get_error_string(result), "]");
hand_trackers[i].is_initialized = false;
} else {
void *next_pointer = nullptr;
next_pointer = nullptr;
hand_trackers[i].velocities.type = XR_TYPE_HAND_JOINT_VELOCITIES_EXT;
hand_trackers[i].velocities.next = next_pointer;
@ -158,6 +171,14 @@ void OpenXRHandTrackingExtension::on_process() {
hand_trackers[i].velocities.jointVelocities = hand_trackers[i].joint_velocities;
next_pointer = &hand_trackers[i].velocities;
if (hand_tracking_source_ext) {
hand_trackers[i].data_source.type = XR_TYPE_HAND_TRACKING_DATA_SOURCE_STATE_EXT;
hand_trackers[i].data_source.next = next_pointer;
hand_trackers[i].data_source.isActive = false;
hand_trackers[i].data_source.dataSource = XrHandTrackingDataSourceEXT(0);
next_pointer = &hand_trackers[i].data_source;
}
hand_trackers[i].locations.type = XR_TYPE_HAND_JOINT_LOCATIONS_EXT;
hand_trackers[i].locations.next = next_pointer;
hand_trackers[i].locations.isActive = false;
@ -171,14 +192,9 @@ void OpenXRHandTrackingExtension::on_process() {
if (hand_trackers[i].is_initialized) {
void *next_pointer = nullptr;
XrHandJointsMotionRangeInfoEXT motionRangeInfo;
XrHandJointsMotionRangeInfoEXT motion_range_info = { XR_TYPE_HAND_JOINTS_MOTION_RANGE_INFO_EXT, next_pointer, hand_trackers[i].motion_range };
if (hand_motion_range_ext) {
motionRangeInfo.type = XR_TYPE_HAND_JOINTS_MOTION_RANGE_INFO_EXT;
motionRangeInfo.next = next_pointer;
motionRangeInfo.handJointsMotionRange = hand_trackers[i].motion_range;
next_pointer = &motionRangeInfo;
next_pointer = &motion_range_info;
}
XrHandJointsLocateInfoEXT locateInfo = {
@ -240,6 +256,25 @@ XrHandJointsMotionRangeEXT OpenXRHandTrackingExtension::get_motion_range(HandTra
return hand_trackers[p_hand].motion_range;
}
OpenXRHandTrackingExtension::HandTrackedSource OpenXRHandTrackingExtension::get_hand_tracking_source(HandTrackedHands p_hand) const {
ERR_FAIL_UNSIGNED_INDEX_V(p_hand, OPENXR_MAX_TRACKED_HANDS, OPENXR_SOURCE_UNKNOWN);
if (hand_tracking_source_ext && hand_trackers[p_hand].data_source.isActive) {
switch (hand_trackers[p_hand].data_source.dataSource) {
case XR_HAND_TRACKING_DATA_SOURCE_UNOBSTRUCTED_EXT:
return OPENXR_SOURCE_UNOBSTRUCTED;
case XR_HAND_TRACKING_DATA_SOURCE_CONTROLLER_EXT:
return OPENXR_SOURCE_CONTROLLER;
default:
return OPENXR_SOURCE_UNKNOWN;
}
}
return OPENXR_SOURCE_UNKNOWN;
}
void OpenXRHandTrackingExtension::set_motion_range(HandTrackedHands p_hand, XrHandJointsMotionRangeEXT p_motion_range) {
ERR_FAIL_UNSIGNED_INDEX(p_hand, OPENXR_MAX_TRACKED_HANDS);
hand_trackers[p_hand].motion_range = p_motion_range;

12
modules/openxr/extensions/openxr_hand_tracking_extension.h
View File

@ -43,9 +43,17 @@ public:
OPENXR_MAX_TRACKED_HANDS
};
enum HandTrackedSource {
OPENXR_SOURCE_UNKNOWN,
OPENXR_SOURCE_UNOBSTRUCTED,
OPENXR_SOURCE_CONTROLLER,
OPENXR_SOURCE_MAX
};
struct HandTracker {
bool is_initialized = false;
XrHandJointsMotionRangeEXT motion_range = XR_HAND_JOINTS_MOTION_RANGE_UNOBSTRUCTED_EXT;
HandTrackedSource source = OPENXR_SOURCE_UNKNOWN;
XrHandTrackerEXT hand_tracker = XR_NULL_HANDLE;
XrHandJointLocationEXT joint_locations[XR_HAND_JOINT_COUNT_EXT];
@ -53,6 +61,7 @@ public:
XrHandJointVelocitiesEXT velocities;
XrHandJointLocationsEXT locations;
XrHandTrackingDataSourceStateEXT data_source;
};
static OpenXRHandTrackingExtension *get_singleton();
@ -77,6 +86,8 @@ public:
XrHandJointsMotionRangeEXT get_motion_range(HandTrackedHands p_hand) const;
void set_motion_range(HandTrackedHands p_hand, XrHandJointsMotionRangeEXT p_motion_range);
HandTrackedSource get_hand_tracking_source(HandTrackedHands p_hand) const;
XrSpaceLocationFlags get_hand_joint_location_flags(HandTrackedHands p_hand, XrHandJointEXT p_joint) const;
Quaternion get_hand_joint_rotation(HandTrackedHands p_hand, XrHandJointEXT p_joint) const;
Vector3 get_hand_joint_position(HandTrackedHands p_hand, XrHandJointEXT p_joint) const;
@ -96,6 +107,7 @@ private:
// related extensions
bool hand_tracking_ext = false;
bool hand_motion_range_ext = false;
bool hand_tracking_source_ext = false;
// functions
void cleanup_hand_tracking();

28
modules/openxr/openxr_interface.cpp
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@ -77,6 +77,8 @@ void OpenXRInterface::_bind_methods() {
ClassDB::bind_method(D_METHOD("set_motion_range", "hand", "motion_range"), &OpenXRInterface::set_motion_range);
ClassDB::bind_method(D_METHOD("get_motion_range", "hand"), &OpenXRInterface::get_motion_range);
ClassDB::bind_method(D_METHOD("get_hand_tracking_source", "hand"), &OpenXRInterface::get_hand_tracking_source);
ClassDB::bind_method(D_METHOD("get_hand_joint_flags", "hand", "joint"), &OpenXRInterface::get_hand_joint_flags);
ClassDB::bind_method(D_METHOD("get_hand_joint_rotation", "hand", "joint"), &OpenXRInterface::get_hand_joint_rotation);
@ -97,6 +99,11 @@ void OpenXRInterface::_bind_methods() {
BIND_ENUM_CONSTANT(HAND_MOTION_RANGE_CONFORM_TO_CONTROLLER);
BIND_ENUM_CONSTANT(HAND_MOTION_RANGE_MAX);
BIND_ENUM_CONSTANT(HAND_TRACKED_SOURCE_UNKNOWN);
BIND_ENUM_CONSTANT(HAND_TRACKED_SOURCE_UNOBSTRUCTED);
BIND_ENUM_CONSTANT(HAND_TRACKED_SOURCE_CONTROLLER);
BIND_ENUM_CONSTANT(HAND_TRACKED_SOURCE_MAX);
BIND_ENUM_CONSTANT(HAND_JOINT_PALM);
BIND_ENUM_CONSTANT(HAND_JOINT_WRIST);
BIND_ENUM_CONSTANT(HAND_JOINT_THUMB_METACARPAL);
@ -1269,6 +1276,27 @@ OpenXRInterface::HandMotionRange OpenXRInterface::get_motion_range(const Hand p_
return HAND_MOTION_RANGE_MAX;
}
OpenXRInterface::HandTrackedSource OpenXRInterface::get_hand_tracking_source(const Hand p_hand) const {
ERR_FAIL_INDEX_V(p_hand, HAND_MAX, HAND_TRACKED_SOURCE_UNKNOWN);
OpenXRHandTrackingExtension *hand_tracking_ext = OpenXRHandTrackingExtension::get_singleton();
if (hand_tracking_ext && hand_tracking_ext->get_active()) {
OpenXRHandTrackingExtension::HandTrackedSource source = hand_tracking_ext->get_hand_tracking_source(OpenXRHandTrackingExtension::HandTrackedHands(p_hand));
switch (source) {
case OpenXRHandTrackingExtension::OPENXR_SOURCE_UNOBSTRUCTED:
return HAND_TRACKED_SOURCE_UNOBSTRUCTED;
case OpenXRHandTrackingExtension::OPENXR_SOURCE_CONTROLLER:
return HAND_TRACKED_SOURCE_CONTROLLER;
case OpenXRHandTrackingExtension::OPENXR_SOURCE_UNKNOWN:
return HAND_TRACKED_SOURCE_UNKNOWN;
default:
ERR_FAIL_V_MSG(HAND_TRACKED_SOURCE_UNKNOWN, "Unknown hand tracking source returned by OpenXR");
}
}
return HAND_TRACKED_SOURCE_UNKNOWN;
}
BitField<OpenXRInterface::HandJointFlags> OpenXRInterface::get_hand_joint_flags(Hand p_hand, HandJoints p_joint) const {
BitField<OpenXRInterface::HandJointFlags> bits;

10
modules/openxr/openxr_interface.h
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@ -194,6 +194,15 @@ public:
void set_motion_range(const Hand p_hand, const HandMotionRange p_motion_range);
HandMotionRange get_motion_range(const Hand p_hand) const;
enum HandTrackedSource {
HAND_TRACKED_SOURCE_UNKNOWN,
HAND_TRACKED_SOURCE_UNOBSTRUCTED,
HAND_TRACKED_SOURCE_CONTROLLER,
HAND_TRACKED_SOURCE_MAX
};
HandTrackedSource get_hand_tracking_source(const Hand p_hand) const;
enum HandJoints {
HAND_JOINT_PALM = 0,
HAND_JOINT_WRIST = 1,
@ -248,6 +257,7 @@ public:
VARIANT_ENUM_CAST(OpenXRInterface::Hand)
VARIANT_ENUM_CAST(OpenXRInterface::HandMotionRange)
VARIANT_ENUM_CAST(OpenXRInterface::HandTrackedSource)
VARIANT_ENUM_CAST(OpenXRInterface::HandJoints)
VARIANT_BITFIELD_CAST(OpenXRInterface::HandJointFlags)