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/**************************************************************************/
/* openxr_eye_gaze_interaction.cpp */
/**************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/**************************************************************************/
/* Copyright (c) 2024-present Redot Engine contributors */
/* (see REDOT_AUTHORS.md) */
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
/* */
/* 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_eye_gaze_interaction.h"
#include "core/config/project_settings.h"
#include "core/os/os.h"
#include "../action_map/openxr_interaction_profile_metadata.h"
#include "../openxr_api.h"
OpenXREyeGazeInteractionExtension *OpenXREyeGazeInteractionExtension::singleton = nullptr;
OpenXREyeGazeInteractionExtension *OpenXREyeGazeInteractionExtension::get_singleton() {
ERR_FAIL_NULL_V(singleton, nullptr);
return singleton;
}
OpenXREyeGazeInteractionExtension::OpenXREyeGazeInteractionExtension() {
singleton = this;
}
OpenXREyeGazeInteractionExtension::~OpenXREyeGazeInteractionExtension() {
singleton = nullptr;
}
HashMap<String, bool *> OpenXREyeGazeInteractionExtension::get_requested_extensions() {
HashMap<String, bool *> request_extensions;
// Only enable this extension when requested.
// We still register our meta data or the action map editor will fail.
if (GLOBAL_GET("xr/openxr/extensions/eye_gaze_interaction") && (!OS::get_singleton()->has_feature("mobile") || OS::get_singleton()->has_feature(XR_EXT_EYE_GAZE_INTERACTION_EXTENSION_NAME))) {
request_extensions[XR_EXT_EYE_GAZE_INTERACTION_EXTENSION_NAME] = &available;
}
return request_extensions;
}
void *OpenXREyeGazeInteractionExtension::set_system_properties_and_get_next_pointer(void *p_next_pointer) {
if (!available) {
return p_next_pointer;
}
properties.type = XR_TYPE_SYSTEM_EYE_GAZE_INTERACTION_PROPERTIES_EXT;
properties.next = p_next_pointer;
properties.supportsEyeGazeInteraction = false;
return &properties;
}
PackedStringArray OpenXREyeGazeInteractionExtension::get_suggested_tracker_names() {
PackedStringArray arr = { "/user/eyes_ext" };
return arr;
}
bool OpenXREyeGazeInteractionExtension::is_available() {
return available;
}
bool OpenXREyeGazeInteractionExtension::supports_eye_gaze_interaction() {
// The extension being available only means that the OpenXR Runtime supports the extension.
// The `supportsEyeGazeInteraction` is set to true if the device also supports this.
// Thus both need to be true.
// In addition, on mobile runtimes, the proper permission needs to be granted.
if (available && properties.supportsEyeGazeInteraction) {
return !OS::get_singleton()->has_feature("mobile") || OS::get_singleton()->has_feature("PERMISSION_XR_EXT_eye_gaze_interaction");
}
return false;
}
void OpenXREyeGazeInteractionExtension::on_register_metadata() {
OpenXRInteractionProfileMetadata *metadata = OpenXRInteractionProfileMetadata::get_singleton();
ERR_FAIL_NULL(metadata);
// Eyes top path
metadata->register_top_level_path("Eye gaze tracker", "/user/eyes_ext", XR_EXT_EYE_GAZE_INTERACTION_EXTENSION_NAME);
// Eye gaze interaction
metadata->register_interaction_profile("Eye gaze", "/interaction_profiles/ext/eye_gaze_interaction", XR_EXT_EYE_GAZE_INTERACTION_EXTENSION_NAME);
metadata->register_io_path("/interaction_profiles/ext/eye_gaze_interaction", "Gaze pose", "/user/eyes_ext", "/user/eyes_ext/input/gaze_ext/pose", "", OpenXRAction::OPENXR_ACTION_POSE);
}
bool OpenXREyeGazeInteractionExtension::get_eye_gaze_pose(double p_dist, Vector3 &r_eye_pose) {
OpenXRAPI *openxr_api = OpenXRAPI::get_singleton();
ERR_FAIL_NULL_V(openxr_api, false);
if (!init_eye_gaze_pose) {
init_eye_gaze_pose = true;
eye_tracker = openxr_api->find_tracker("/user/eyes_ext");
if (eye_tracker.is_null()) {
WARN_PRINT("Couldn't obtain eye tracker");
}
eye_action = openxr_api->find_action("eye_gaze_pose");
if (eye_action.is_null()) {
WARN_PRINT("Couldn't obtain pose action for `eye_gaze_pose`, make sure to add this to your action map.");
}
}
if (eye_tracker.is_null() || eye_action.is_null()) {
return false;
}
Transform3D eye_transform;
Vector3 linear_velocity;
Vector3 angular_velocity;
XRPose::TrackingConfidence confidence = openxr_api->get_action_pose(eye_action, eye_tracker, eye_transform, linear_velocity, angular_velocity);
if (confidence == XRPose::XR_TRACKING_CONFIDENCE_NONE) {
return false;
}
r_eye_pose = eye_transform.origin + eye_transform.basis[2] * p_dist;
return true;
}
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