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Packages/PICO Unity Integration SDK-3.3.2-20251111/Runtime/CompositionLayers/PXR_Utility.cs

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+using System.Runtime.InteropServices;
+using UnityEngine;
+
+namespace Unity.XR.PXR
+{
+    /// <summary>
+    /// PXR_ Utility Class contains helper methods that any script can use.
+    /// </summary>
+    public static class PXR_Utility
+    {
+        /// <summary>
+        /// Computes the inverse of the given pose.
+        /// </summary>
+        private static Pose Inverse(Pose p)
+        {
+            Pose ret;
+            ret.rotation = Quaternion.Inverse(p.rotation);
+            ret.position = ret.rotation * -p.position;
+            return ret;
+        }
+
+        /// <summary>
+        /// Recalculate object position and rotation from tracking-space to world-space, for use cases like teleporting.
+        /// </summary>
+        /// <param name="t">original transform of the object in the scene, typically obtained by gameObject.transform</param>
+        /// <param name="camera">camera the calculation is based on, normally it is the main camera</param>
+        /// <returns>the recalculated pose <see cref="UnityEngine.Pose"/> in world-space.</returns>
+        public static Pose ComputePoseToWorldSpace(Transform t, Camera camera)
+        {
+            if (camera == null)
+                return default;
+
+            Transform cameraTransform = camera.transform;
+            Pose headPose = new Pose(cameraTransform.localPosition, cameraTransform.localRotation);
+            Pose camPose = new Pose(cameraTransform.position, cameraTransform.rotation);
+            Pose transformPose = new Pose(t.position, t.rotation);
+
+            Pose headSpacePose = transformPose.GetTransformedBy(Inverse(camPose));
+            return headSpacePose.GetTransformedBy(headPose);
+        }
+
+        /// <summary>
+        /// Returns if the current session is in the focused state.
+        /// See <a href="https://registry.khronos.org/PXR_/specs/1.0/html/xrspec.html#session-states">XR_SESSION_STATE_FOCUSED.</a> for reference.
+        /// </summary>
+        public static bool IsSessionFocused => Internal_IsSessionFocused();
+        /// <summary>
+        ///  Returns the change of user presence, such as when the user has taken off or put on an XR headset.
+        ///  If the system does not support user presence sensing, runtime assumes that the user is always present and IsUserPresent always returns True.
+        ///  If the system supports the sensing of user presence, returns true when detected the presence of a user and returns false when detected the absence of a user.
+        ///  See <a href="https://registry.khronos.org/PXR_/specs/1.0/html/xrspec.html#XR_EXT_user_presence">XR_EXT_user_presence.</a> for reference.
+        /// </summary>
+        public static bool IsUserPresent => Internal_GetUserPresence();
+
+        private const string LibraryName = "PxrPlatform";
+
+        [DllImport(LibraryName, EntryPoint = "NativeConfig_IsSessionFocused")]
+        [return: MarshalAs(UnmanagedType.U1)]
+        private static extern bool Internal_IsSessionFocused();
+
+        [DllImport(LibraryName, EntryPoint = "NativeConfig_GetUserPresence")]
+        [return: MarshalAs(UnmanagedType.U1)]
+        private static extern bool Internal_GetUserPresence();
+    }
+}