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Adding OpenXR hand tracking support

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Bastiaan Olij
2022-04-17 12:58:09 +10:00
parent 3472bdd6b6
commit 23d32c0e16
10 changed files with 823 additions and 7 deletions
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modules/openxr/extensions/openxr_hand_tracking_extension.cpp Normal file
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/*************************************************************************/
/* openxr_hand_tracking_extension.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#include "openxr_hand_tracking_extension.h"
#include "../openxr_api.h"
#include "core/string/print_string.h"
#include "servers/xr_server.h"
#include <openxr/openxr.h>
OpenXRHandTrackingExtension *OpenXRHandTrackingExtension::singleton = nullptr;
OpenXRHandTrackingExtension *OpenXRHandTrackingExtension::get_singleton() {
return singleton;
}
OpenXRHandTrackingExtension::OpenXRHandTrackingExtension(OpenXRAPI *p_openxr_api) :
OpenXRExtensionWrapper(p_openxr_api) {
singleton = this;
// Extensions we use for our hand tracking.
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_FB_HAND_TRACKING_AIM_EXTENSION_NAME] = &hand_tracking_aim_state_ext;
// Make sure this is cleared until we actually request it
handTrackingSystemProperties.supportsHandTracking = false;
}
OpenXRHandTrackingExtension::~OpenXRHandTrackingExtension() {
singleton = nullptr;
}
void OpenXRHandTrackingExtension::on_instance_created(const XrInstance p_instance) {
if (hand_tracking_ext) {
EXT_INIT_XR_FUNC(xrCreateHandTrackerEXT);
EXT_INIT_XR_FUNC(xrDestroyHandTrackerEXT);
EXT_INIT_XR_FUNC(xrLocateHandJointsEXT);
hand_tracking_ext = xrCreateHandTrackerEXT_ptr && xrDestroyHandTrackerEXT_ptr && xrLocateHandJointsEXT_ptr;
}
}
void OpenXRHandTrackingExtension::on_session_destroyed() {
cleanup_hand_tracking();
}
void OpenXRHandTrackingExtension::on_instance_destroyed() {
xrCreateHandTrackerEXT_ptr = nullptr;
xrDestroyHandTrackerEXT_ptr = nullptr;
xrLocateHandJointsEXT_ptr = nullptr;
}
void *OpenXRHandTrackingExtension::set_system_properties_and_get_next_pointer(void *p_next_pointer) {
if (!hand_tracking_ext) {
// not supported...
return p_next_pointer;
}
handTrackingSystemProperties = {
XR_TYPE_SYSTEM_HAND_TRACKING_PROPERTIES_EXT, // type
p_next_pointer, // next
false, // supportsHandTracking
};
return &handTrackingSystemProperties;
}
void OpenXRHandTrackingExtension::on_state_ready() {
if (!handTrackingSystemProperties.supportsHandTracking) {
// not supported...
return;
}
// Setup our hands and reset data
for (int i = 0; i < MAX_OPENXR_TRACKED_HANDS; i++) {
// we'll do this later
hand_trackers[i].is_initialised = false;
hand_trackers[i].hand_tracker = XR_NULL_HANDLE;
hand_trackers[i].aimState.aimPose = { { 0.0, 0.0, 0.0, 0.0 }, { 0.0, 0.0, 0.0 } };
hand_trackers[i].aimState.pinchStrengthIndex = 0.0;
hand_trackers[i].aimState.pinchStrengthMiddle = 0.0;
hand_trackers[i].aimState.pinchStrengthRing = 0.0;
hand_trackers[i].aimState.pinchStrengthLittle = 0.0;
hand_trackers[i].locations.isActive = false;
for (int j = 0; j < XR_HAND_JOINT_COUNT_EXT; j++) {
hand_trackers[i].joint_locations[j] = { 0, { { 0.0, 0.0, 0.0, 0.0 }, { 0.0, 0.0, 0.0 } }, 0.0 };
hand_trackers[i].joint_velocities[j] = { 0, { 0.0, 0.0, 0.0 }, { 0.0, 0.0, 0.0 } };
}
}
}
void OpenXRHandTrackingExtension::on_process() {
if (!handTrackingSystemProperties.supportsHandTracking) {
// not supported...
return;
}
// process our hands
const XrTime time = openxr_api->get_next_frame_time(); // This data will be used for the next frame we render
XrResult result;
for (int i = 0; i < MAX_OPENXR_TRACKED_HANDS; i++) {
if (hand_trackers[i].hand_tracker == XR_NULL_HANDLE) {
XrHandTrackerCreateInfoEXT createInfo = {
XR_TYPE_HAND_TRACKER_CREATE_INFO_EXT, // type
nullptr, // next
i == 0 ? XR_HAND_LEFT_EXT : XR_HAND_RIGHT_EXT, // hand
XR_HAND_JOINT_SET_DEFAULT_EXT, // handJointSet
};
result = xrCreateHandTrackerEXT(openxr_api->get_session(), &createInfo, &hand_trackers[i].hand_tracker);
if (XR_FAILED(result)) {
// not successful? then we do nothing.
print_line("OpenXR: Failed to obtain hand tracking information [", openxr_api->get_error_string(result), "]");
hand_trackers[i].is_initialised = false;
} else {
void *next_pointer = nullptr;
if (hand_tracking_aim_state_ext) {
hand_trackers[i].aimState.type = XR_TYPE_HAND_TRACKING_AIM_STATE_FB;
hand_trackers[i].aimState.next = next_pointer;
hand_trackers[i].aimState.status = 0;
hand_trackers[i].aimState.aimPose = { { 0.0, 0.0, 0.0, 0.0 }, { 0.0, 0.0, 0.0 } };
hand_trackers[i].aimState.pinchStrengthIndex = 0.0;
hand_trackers[i].aimState.pinchStrengthMiddle = 0.0;
hand_trackers[i].aimState.pinchStrengthRing = 0.0;
hand_trackers[i].aimState.pinchStrengthLittle = 0.0;
next_pointer = &hand_trackers[i].aimState;
}
hand_trackers[i].velocities.type = XR_TYPE_HAND_JOINT_VELOCITIES_EXT;
hand_trackers[i].velocities.next = next_pointer;
hand_trackers[i].velocities.jointCount = XR_HAND_JOINT_COUNT_EXT;
hand_trackers[i].velocities.jointVelocities = hand_trackers[i].joint_velocities;
next_pointer = &hand_trackers[i].velocities;
hand_trackers[i].locations.type = XR_TYPE_HAND_JOINT_LOCATIONS_EXT;
hand_trackers[i].locations.next = next_pointer;
hand_trackers[i].locations.isActive = false;
hand_trackers[i].locations.jointCount = XR_HAND_JOINT_COUNT_EXT;
hand_trackers[i].locations.jointLocations = hand_trackers[i].joint_locations;
hand_trackers[i].is_initialised = true;
}
}
if (hand_trackers[i].is_initialised) {
void *next_pointer = nullptr;
XrHandJointsMotionRangeInfoEXT motionRangeInfo;
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;
}
XrHandJointsLocateInfoEXT locateInfo = {
XR_TYPE_HAND_JOINTS_LOCATE_INFO_EXT, // type
next_pointer, // next
openxr_api->get_play_space(), // baseSpace
time, // time
};
result = xrLocateHandJointsEXT(hand_trackers[i].hand_tracker, &locateInfo, &hand_trackers[i].locations);
if (XR_FAILED(result)) {
// not successful? then we do nothing.
print_line("OpenXR: Failed to get tracking for hand", i, "[", openxr_api->get_error_string(result), "]");
continue;
}
// For some reason an inactive controller isn't coming back as inactive but has coordinates either as NAN or very large
const XrPosef &palm = hand_trackers[i].joint_locations[XR_HAND_JOINT_PALM_EXT].pose;
if (
!hand_trackers[i].locations.isActive || isnan(palm.position.x) || palm.position.x < -1000000.00 || palm.position.x > 1000000.00) {
hand_trackers[i].locations.isActive = false; // workaround, make sure its inactive
}
/* TODO change this to managing the controller from openxr_interface
if (hand_tracking_aim_state_ext && hand_trackers[i].locations.isActive && check_bit(XR_HAND_TRACKING_AIM_VALID_BIT_FB, hand_trackers[i].aimState.status)) {
// Controllers are updated based on the aim state's pose and pinches' strength
if (hand_trackers[i].aim_state_godot_controller == -1) {
hand_trackers[i].aim_state_godot_controller =
arvr_api->godot_arvr_add_controller(
const_cast<char *>(hand_controller_names[i]),
i + HAND_CONTROLLER_ID_OFFSET,
true,
true);
}
}
*/
}
}
}
void OpenXRHandTrackingExtension::on_state_stopping() {
// cleanup
cleanup_hand_tracking();
}
void OpenXRHandTrackingExtension::cleanup_hand_tracking() {
XRServer *xr_server = XRServer::get_singleton();
ERR_FAIL_NULL(xr_server);
for (int i = 0; i < MAX_OPENXR_TRACKED_HANDS; i++) {
if (hand_trackers[i].hand_tracker != XR_NULL_HANDLE) {
xrDestroyHandTrackerEXT(hand_trackers[i].hand_tracker);
hand_trackers[i].is_initialised = false;
hand_trackers[i].hand_tracker = XR_NULL_HANDLE;
}
}
}
bool OpenXRHandTrackingExtension::get_active() {
return handTrackingSystemProperties.supportsHandTracking;
}
const OpenXRHandTrackingExtension::HandTracker *OpenXRHandTrackingExtension::get_hand_tracker(uint32_t p_hand) const {
ERR_FAIL_UNSIGNED_INDEX_V(p_hand, MAX_OPENXR_TRACKED_HANDS, nullptr);
return &hand_trackers[p_hand];
}
XrHandJointsMotionRangeEXT OpenXRHandTrackingExtension::get_motion_range(uint32_t p_hand) const {
ERR_FAIL_UNSIGNED_INDEX_V(p_hand, MAX_OPENXR_TRACKED_HANDS, XR_HAND_JOINTS_MOTION_RANGE_MAX_ENUM_EXT);
return hand_trackers[p_hand].motion_range;
}
void OpenXRHandTrackingExtension::set_motion_range(uint32_t p_hand, XrHandJointsMotionRangeEXT p_motion_range) {
ERR_FAIL_UNSIGNED_INDEX(p_hand, MAX_OPENXR_TRACKED_HANDS);
hand_trackers[p_hand].motion_range = p_motion_range;
}