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Packages/com.htc.upm.vive.openxr/Runtime/Features/CompositionLayer/Scripts/ViveCompositionLayer.cs

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+// Copyright HTC Corporation All Rights Reserved.
+
+using System.Collections.Generic;
+using UnityEditor;
+using UnityEngine.XR.OpenXR;
+using UnityEngine.XR.OpenXR.Features;
+using AOT;
+using UnityEngine;
+using System;
+using System.Runtime.InteropServices;
+using System.Linq;
+
+#if UNITY_EDITOR
+using UnityEditor.XR.OpenXR.Features;
+#endif
+
+namespace VIVE.OpenXR.CompositionLayer
+{
+#if UNITY_EDITOR
+	[OpenXRFeature(UiName = "VIVE XR Composition Layer",
+		Desc = "Enable this feature to use the Composition Layer.",
+		Company = "HTC",
+		DocumentationLink = "..\\Documentation",
+		OpenxrExtensionStrings = kOpenxrExtensionStrings,
+		Version = "1.0.0",
+		BuildTargetGroups = new[] { BuildTargetGroup.Android },
+		FeatureId = featureId
+	)]
+#endif
+	public class ViveCompositionLayer : OpenXRFeature
+	{
+		const string LOG_TAG = "VIVE.OpenXR.ViveCompositionLayer";
+		static void DEBUG(string msg) { Debug.Log(LOG_TAG + " " + msg); }
+		static void WARNING(string msg) { Debug.LogWarning(LOG_TAG + " " + msg); }
+		static void ERROR(string msg) { Debug.LogError(LOG_TAG + " " + msg); }
+
+		/// <summary>
+		/// Enable auto fallback or Not.
+		/// </summary>
+		public bool enableAutoFallback = false;
+
+		/// <summary>
+		/// The feature id string. This is used to give the feature a well known id for reference.
+		/// </summary>
+		public const string featureId = "vive.openxr.feature.compositionlayer";
+
+		public const string kOpenxrExtensionStrings = "";
+
+		#region OpenXR Life Cycle
+		private bool m_XrInstanceCreated = false;
+		/// <summary>
+		/// The XR instance is created or not.
+		/// </summary>
+		public bool XrInstanceCreated
+		{
+			get { return m_XrInstanceCreated; }
+		}
+		private XrInstance m_XrInstance = 0;
+		protected override bool OnInstanceCreate(ulong xrInstance)
+		{
+			foreach (string kOpenxrExtensionString in kOpenxrExtensionStrings.Split(' '))
+			{
+				if (!OpenXRRuntime.IsExtensionEnabled(kOpenxrExtensionString))
+				{
+					WARNING("OnInstanceCreate() " + kOpenxrExtensionString + " is NOT enabled.");
+				}
+			}
+
+			m_XrInstanceCreated = true;
+			m_XrInstance = xrInstance;
+			DEBUG("OnInstanceCreate() " + m_XrInstance);
+
+			return GetXrFunctionDelegates(m_XrInstance);
+		}
+
+		protected override void OnInstanceDestroy(ulong xrInstance)
+		{
+			m_XrInstanceCreated = false;
+			DEBUG("OnInstanceDestroy() " + m_XrInstance);
+		}
+
+		private XrSystemId m_XrSystemId = 0;
+		protected override void OnSystemChange(ulong xrSystem)
+		{
+			m_XrSystemId = xrSystem;
+			DEBUG("OnSystemChange() " + m_XrSystemId);
+		}
+
+		private bool m_XrSessionCreated = false;
+		/// <summary>
+		/// The XR session is created or not.
+		/// </summary>
+		public bool XrSessionCreated
+		{
+			get { return m_XrSessionCreated; }
+		}
+		private XrSession m_XrSession = 0;
+		protected override void OnSessionCreate(ulong xrSession)
+		{
+			m_XrSession = xrSession;
+			m_XrSessionCreated = true;
+			DEBUG("OnSessionCreate() " + m_XrSession);
+		}
+
+		private bool m_XrSessionEnding = false;
+		/// <summary>
+		/// The XR session is ending or not.
+		/// </summary>
+		public bool XrSessionEnding
+		{
+			get { return m_XrSessionEnding; }
+		}
+
+		private XrSpace m_WorldLockSpaceOriginOnHead = 0, m_WorldLockSpaceOriginOnFloor = 0, m_HeadLockSpace = 0;
+		/// <summary>
+		/// The XrSpace of world lock space origin on head.
+		/// </summary>
+		public XrSpace WorldLockSpaceOriginOnHead
+		{
+			get { return m_WorldLockSpaceOriginOnHead; }
+		}
+		/// <summary>
+		/// The XrSpace of world lock space origin on floor.
+		/// </summary>
+		public XrSpace WorldLockSpaceOriginOnFloor
+		{
+			get { return m_WorldLockSpaceOriginOnFloor; }
+		}
+		/// <summary>
+		/// The XrSpace of head lock space.
+		/// </summary>
+		public XrSpace HeadLockSpace
+		{
+			get { return m_HeadLockSpace; }
+		}
+
+		protected override void OnSessionBegin(ulong xrSession)
+		{
+			m_XrSessionEnding = false;
+			DEBUG("OnSessionBegin() " + m_XrSession);
+
+			// Enumerate supported reference space types and create the XrSpace.
+			XrReferenceSpaceType[] spaces = new XrReferenceSpaceType[Enum.GetNames(typeof(XrReferenceSpaceType)).Count()];
+			UInt32 spaceCountOutput;
+			if (EnumerateReferenceSpaces(
+				spaceCapacityInput: 0,
+				spaceCountOutput: out spaceCountOutput,
+				spaces: out spaces[0]) == XrResult.XR_SUCCESS)
+			{
+				//DEBUG("spaceCountOutput: " + spaceCountOutput);
+
+				Array.Resize(ref spaces, (int)spaceCountOutput);
+				if (EnumerateReferenceSpaces(
+					spaceCapacityInput: spaceCountOutput,
+					spaceCountOutput: out spaceCountOutput,
+					spaces: out spaces[0]) == XrResult.XR_SUCCESS)
+				{
+					if (spaces.Contains(XrReferenceSpaceType.XR_REFERENCE_SPACE_TYPE_LOCAL))
+					{
+						XrReferenceSpaceCreateInfo referenceSpaceCreateInfoWorldLock;
+						referenceSpaceCreateInfoWorldLock.type = XrStructureType.XR_TYPE_REFERENCE_SPACE_CREATE_INFO;
+						referenceSpaceCreateInfoWorldLock.next = IntPtr.Zero;
+						referenceSpaceCreateInfoWorldLock.referenceSpaceType = XrReferenceSpaceType.XR_REFERENCE_SPACE_TYPE_LOCAL;
+						referenceSpaceCreateInfoWorldLock.poseInReferenceSpace.orientation = new XrQuaternionf(0, 0, 0, 1);
+						referenceSpaceCreateInfoWorldLock.poseInReferenceSpace.position = new XrVector3f(0, 0, 0);
+
+						if (CreateReferenceSpace(
+						createInfo: ref referenceSpaceCreateInfoWorldLock,
+						space: out m_WorldLockSpaceOriginOnHead) == XrResult.XR_SUCCESS)
+						{
+							//DEBUG("CreateReferenceSpace: " + m_WorldLockSpaceOriginOnHead);
+						}
+						else
+						{
+							ERROR("CreateReferenceSpace for world lock layers on head failed.");
+						}
+					}
+					else
+					{
+						ERROR("CreateReferenceSpace no space type for world lock on head layers.");
+					}
+
+					if (spaces.Contains(XrReferenceSpaceType.XR_REFERENCE_SPACE_TYPE_STAGE))
+					{
+						XrReferenceSpaceCreateInfo referenceSpaceCreateInfoWorldLock;
+						referenceSpaceCreateInfoWorldLock.type = XrStructureType.XR_TYPE_REFERENCE_SPACE_CREATE_INFO;
+						referenceSpaceCreateInfoWorldLock.next = IntPtr.Zero;
+						referenceSpaceCreateInfoWorldLock.referenceSpaceType = XrReferenceSpaceType.XR_REFERENCE_SPACE_TYPE_STAGE;
+						referenceSpaceCreateInfoWorldLock.poseInReferenceSpace.orientation = new XrQuaternionf(0, 0, 0, 1);
+						referenceSpaceCreateInfoWorldLock.poseInReferenceSpace.position = new XrVector3f(0, 0, 0);
+
+						if (CreateReferenceSpace(
+						createInfo: ref referenceSpaceCreateInfoWorldLock,
+						space: out m_WorldLockSpaceOriginOnFloor) == XrResult.XR_SUCCESS)
+						{
+							//DEBUG("CreateReferenceSpace: " + m_WorldLockSpaceOriginOnFloor);
+						}
+						else
+						{
+							ERROR("CreateReferenceSpace for world lock layers on floor failed.");
+						}
+					}
+					else
+					{
+						ERROR("CreateReferenceSpace no space type for world lock on floor layers.");
+					}
+
+					if (spaces.Contains(XrReferenceSpaceType.XR_REFERENCE_SPACE_TYPE_VIEW))
+					{
+						XrReferenceSpaceCreateInfo referenceSpaceCreateInfoHeadLock;
+						referenceSpaceCreateInfoHeadLock.type = XrStructureType.XR_TYPE_REFERENCE_SPACE_CREATE_INFO;
+						referenceSpaceCreateInfoHeadLock.next = IntPtr.Zero;
+						referenceSpaceCreateInfoHeadLock.referenceSpaceType = XrReferenceSpaceType.XR_REFERENCE_SPACE_TYPE_VIEW;
+						referenceSpaceCreateInfoHeadLock.poseInReferenceSpace.orientation = new XrQuaternionf(0, 0, 0, 1);
+						referenceSpaceCreateInfoHeadLock.poseInReferenceSpace.position = new XrVector3f(0, 0, 0);
+
+						if (CreateReferenceSpace(
+						createInfo: ref referenceSpaceCreateInfoHeadLock,
+						space: out m_HeadLockSpace) == XrResult.XR_SUCCESS)
+						{
+							//DEBUG("CreateReferenceSpace: " + m_HeadLockSpace);
+						}
+						else
+						{
+							ERROR("CreateReferenceSpace for head lock layers failed.");
+						}
+					}
+					else
+					{
+						ERROR("CreateReferenceSpace no space type for head lock layers.");
+					}
+				}
+				else
+				{
+					ERROR("EnumerateReferenceSpaces(" + spaceCountOutput + ") failed.");
+				}
+			}
+			else
+			{
+				ERROR("EnumerateReferenceSpaces(0) failed.");
+			}
+		}
+
+		protected override void OnSessionEnd(ulong xrSession)
+		{
+			m_XrSessionEnding = true;
+			DEBUG("OnSessionEnd() " + m_XrSession);
+		}
+
+
+		protected override void OnSessionDestroy(ulong xrSession)
+		{
+			m_XrSessionCreated = false;
+			DEBUG("OnSessionDestroy() " + xrSession);
+
+			if (m_HeadLockSpace != 0)
+			{
+				DestroySpace(m_HeadLockSpace);
+				m_HeadLockSpace = 0;
+			}
+			if (m_WorldLockSpaceOriginOnFloor != 0)
+			{
+				DestroySpace(m_WorldLockSpaceOriginOnFloor);
+				m_WorldLockSpaceOriginOnFloor = 0;
+			}
+			if (m_WorldLockSpaceOriginOnHead != 0)
+			{
+				DestroySpace(m_WorldLockSpaceOriginOnHead);
+				m_WorldLockSpaceOriginOnHead = 0;
+			}
+		}
+
+		/// <summary>
+		/// The current XR Session state.
+		/// </summary>
+		public XrSessionState XrSessionCurrentState
+		{
+			get { return m_XrSessionNewState; }
+		}
+		private XrSessionState m_XrSessionNewState = XrSessionState.XR_SESSION_STATE_UNKNOWN;
+		private XrSessionState m_XrSessionOldState = XrSessionState.XR_SESSION_STATE_UNKNOWN;
+		protected override void OnSessionStateChange(int oldState, int newState)
+		{
+			DEBUG("OnSessionStateChange() oldState: " + oldState + " newState:" + newState);
+
+			if (Enum.IsDefined(typeof(XrSessionState), oldState))
+			{
+				m_XrSessionOldState = (XrSessionState)oldState;
+			}
+			else
+			{
+				DEBUG("OnSessionStateChange() oldState undefined");
+			}
+
+			if (Enum.IsDefined(typeof(XrSessionState), newState)) 
+			{
+				m_XrSessionNewState = (XrSessionState)newState;
+			}
+			else
+			{
+				DEBUG("OnSessionStateChange() newState undefined");
+			}
+			
+		}
+		#endregion
+
+		#region OpenXR function delegates
+		/// xrGetInstanceProcAddr
+		OpenXRHelper.xrGetInstanceProcAddrDelegate XrGetInstanceProcAddr;
+
+		/// xrGetSystemProperties
+		OpenXRHelper.xrGetSystemPropertiesDelegate xrGetSystemProperties;
+		/// <summary>
+		/// Helper function to get this feature' properties.
+		/// See <see href="https://registry.khronos.org/OpenXR/specs/1.0/html/xrspec.html#xrGetSystemProperties">xrGetSystemProperties</see>
+		/// </summary>
+		public XrResult GetSystemProperties(ref XrSystemProperties properties)
+		{
+			if (m_XrInstanceCreated)
+			{
+				return xrGetSystemProperties(m_XrInstance, m_XrSystemId, ref properties);
+			}
+
+			return XrResult.XR_ERROR_INSTANCE_LOST;
+		}
+
+		/// xrEnumerateReferenceSpaces
+		OpenXRHelper.xrEnumerateReferenceSpacesDelegate xrEnumerateReferenceSpaces;
+		/// <summary>
+		/// Enumerate available reference spaces
+		/// See <see href="https://registry.khronos.org/OpenXR/specs/1.0/man/html/xrEnumerateReferenceSpaces.html">xrEnumerateReferenceSpaces</see>
+		/// </summary>
+		public XrResult EnumerateReferenceSpaces(UInt32 spaceCapacityInput, out UInt32 spaceCountOutput, out XrReferenceSpaceType spaces)
+		{
+			if (!m_XrSessionCreated)
+			{
+				spaceCountOutput = 0;
+				spaces = XrReferenceSpaceType.XR_REFERENCE_SPACE_TYPE_UNBOUNDED_MSFT;
+				return XrResult.XR_ERROR_SESSION_NOT_RUNNING;
+			}
+
+			return xrEnumerateReferenceSpaces(m_XrSession, spaceCapacityInput, out spaceCountOutput, out spaces);
+		}
+
+		/// xrCreateReferenceSpace
+		OpenXRHelper.xrCreateReferenceSpaceDelegate xrCreateReferenceSpace;
+		/// <summary>
+		/// Creates a reference space
+		/// See <see href="https://registry.khronos.org/OpenXR/specs/1.0/man/html/xrCreateReferenceSpace.html">xrCreateReferenceSpace</see>
+		/// </summary>
+		public XrResult CreateReferenceSpace(ref XrReferenceSpaceCreateInfo createInfo, out XrSpace space)
+		{
+			if (!m_XrSessionCreated)
+			{
+				space = 0;
+				return XrResult.XR_ERROR_SESSION_NOT_RUNNING;
+			}
+
+			return xrCreateReferenceSpace(m_XrSession, ref createInfo, out space);
+		}
+
+		/// xrDestroySpace
+		OpenXRHelper.xrDestroySpaceDelegate xrDestroySpace;
+		/// <summary>
+		/// Destroys an XrSpace
+		/// See <see href="https://registry.khronos.org/OpenXR/specs/1.0/man/html/xrDestroySpace.html">xrDestroySpace</see>
+		/// </summary>
+		public XrResult DestroySpace(XrSpace space)
+		{
+			if (space != 0)
+			{
+				return xrDestroySpace(space);
+			}
+			return XrResult.XR_ERROR_REFERENCE_SPACE_UNSUPPORTED;
+		}
+
+		private bool GetXrFunctionDelegates(XrInstance xrInstance)
+        {
+            /// xrGetInstanceProcAddr
+            if (xrGetInstanceProcAddr != null && xrGetInstanceProcAddr != IntPtr.Zero)
+            {
+                DEBUG("Get function pointer of xrGetInstanceProcAddr.");
+                XrGetInstanceProcAddr = Marshal.GetDelegateForFunctionPointer(
+                    xrGetInstanceProcAddr,
+                    typeof(OpenXRHelper.xrGetInstanceProcAddrDelegate)) as OpenXRHelper.xrGetInstanceProcAddrDelegate;
+            }
+            else
+            {
+                ERROR("xrGetInstanceProcAddr");
+                return false;
+            }
+
+            IntPtr funcPtr = IntPtr.Zero;
+            /// xrGetSystemProperties
+            if (XrGetInstanceProcAddr(xrInstance, "xrGetSystemProperties", out funcPtr) == XrResult.XR_SUCCESS)
+            {
+                if (funcPtr != IntPtr.Zero)
+                {
+                    DEBUG("Get function pointer of xrGetSystemProperties.");
+                    xrGetSystemProperties = Marshal.GetDelegateForFunctionPointer(
+                        funcPtr,
+                        typeof(OpenXRHelper.xrGetSystemPropertiesDelegate)) as OpenXRHelper.xrGetSystemPropertiesDelegate;
+                }
+            }
+            else
+            {
+                ERROR("xrGetSystemProperties");
+                return false;
+            }
+			/// xrEnumerateReferenceSpaces
+			if (XrGetInstanceProcAddr(xrInstance, "xrEnumerateReferenceSpaces", out funcPtr) == XrResult.XR_SUCCESS)
+			{
+				if (funcPtr != IntPtr.Zero)
+				{
+					DEBUG("Get function pointer of xrEnumerateReferenceSpaces.");
+					xrEnumerateReferenceSpaces = Marshal.GetDelegateForFunctionPointer(
+						funcPtr,
+						typeof(OpenXRHelper.xrEnumerateReferenceSpacesDelegate)) as OpenXRHelper.xrEnumerateReferenceSpacesDelegate;
+				}
+			}
+			else
+			{
+				ERROR("xrEnumerateReferenceSpaces");
+				return false;
+			}
+			/// xrCreateReferenceSpace
+			if (XrGetInstanceProcAddr(xrInstance, "xrCreateReferenceSpace", out funcPtr) == XrResult.XR_SUCCESS)
+			{
+				if (funcPtr != IntPtr.Zero)
+				{
+					DEBUG("Get function pointer of xrCreateReferenceSpace.");
+					xrCreateReferenceSpace = Marshal.GetDelegateForFunctionPointer(
+						funcPtr,
+						typeof(OpenXRHelper.xrCreateReferenceSpaceDelegate)) as OpenXRHelper.xrCreateReferenceSpaceDelegate;
+				}
+			}
+			else
+			{
+				ERROR("xrCreateReferenceSpace");
+				return false;
+			}
+			/// xrDestroySpace
+			if (XrGetInstanceProcAddr(xrInstance, "xrDestroySpace", out funcPtr) == XrResult.XR_SUCCESS)
+			{
+				if (funcPtr != IntPtr.Zero)
+				{
+					DEBUG("Get function pointer of xrDestroySpace.");
+					xrDestroySpace = Marshal.GetDelegateForFunctionPointer(
+						funcPtr,
+						typeof(OpenXRHelper.xrDestroySpaceDelegate)) as OpenXRHelper.xrDestroySpaceDelegate;
+				}
+			}
+			else
+			{
+				ERROR("xrDestroySpace");
+				return false;
+			}
+
+			if (CompositionLayer_GetFuncAddrs(xrInstance, xrGetInstanceProcAddr) == XrResult.XR_SUCCESS)
+			{
+				DEBUG("Get function pointers in native.");
+			}
+			else
+			{
+				ERROR("CompositionLayer_GetFuncAddrs");
+				return false;
+			}
+
+			return true;
+        }
+		#endregion
+
+		#region Wrapper Functions
+		private const string ExtLib = "viveopenxr";
+		[DllImportAttribute(ExtLib, EntryPoint = "compositionlayer_GetExternalSurfaceObj")]
+		public static extern IntPtr VIVEOpenXR_Compositionlayer_GetExternalSurfaceObj();
+		public IntPtr Compositionlayer_GetExternalSurfaceObj()
+		{
+			return VIVEOpenXR_Compositionlayer_GetExternalSurfaceObj();
+		}
+
+		[DllImportAttribute(ExtLib, EntryPoint = "compositionlayer_GetExternalSurfaceObj2")]
+		public static extern IntPtr VIVEOpenXR_Compositionlayer_GetExternalSurfaceObj2(int layerID);
+		public IntPtr Compositionlayer_GetExternalSurfaceObj2(int layerID)
+		{
+			return VIVEOpenXR_Compositionlayer_GetExternalSurfaceObj2(layerID);
+		}
+
+		[DllImportAttribute(ExtLib, EntryPoint = "compositionlayer_Init")]
+		public static extern int VIVEOpenXR_CompositionLayer_Init(XrSession session, uint textureWidth, uint textureHeight, GraphicsAPI graphicsAPI, bool isDynamic, bool isProtected, out uint imageCount, bool isExternal);
+		/// <summary>
+		/// Init composion layer.
+		/// </summary>
+		public int CompositionLayer_Init(uint textureWidth, uint textureHeight, GraphicsAPI graphicsAPI, bool isDynamic, bool isProtected, out uint imageCount, bool isExternal = false)
+		{
+			if (!m_XrSessionCreated)
+			{
+				ERROR("Xr Session not found");
+				imageCount = 0;
+				return 0;
+			}
+
+			return VIVEOpenXR_CompositionLayer_Init(m_XrSession, textureWidth, textureHeight, graphicsAPI, isDynamic, isProtected, out imageCount, isExternal);
+		}
+
+		[DllImportAttribute(ExtLib, EntryPoint = "compositionlayer_GetTexture")]
+		public static extern IntPtr VIVEOpenXR_CompositionLayer_GetTexture(int layerID, out uint imageIndex);
+		/// <summary>
+		/// Get composition layer texture.
+		/// </summary>
+		public IntPtr CompositionLayer_GetTexture(int layerID, out uint imageIndex)
+		{
+			return VIVEOpenXR_CompositionLayer_GetTexture(layerID, out imageIndex);
+		}
+
+		[DllImportAttribute(ExtLib, EntryPoint = "compositionlayer_ReleaseTexture")]
+		public static extern bool VIVEOpenXR_CompositionLayer_ReleaseTexture(int layerID);
+		/// <summary>
+		/// release composition layer texture.
+		/// </summary>
+		public bool CompositionLayer_ReleaseTexture(int layerID)
+		{
+			return VIVEOpenXR_CompositionLayer_ReleaseTexture(layerID);
+		}
+
+		[DllImportAttribute(ExtLib, EntryPoint = "compositionlayer_Destroy")]
+		public static extern bool VIVEOpenXR_CompositionLayer_Destroy(int layerID);
+		/// <summary>
+		/// destroy composition layer.
+		/// </summary>
+		public bool CompositionLayer_Destroy(int layerID)
+		{
+			return VIVEOpenXR_CompositionLayer_Destroy(layerID);
+		}
+
+		[DllImportAttribute(ExtLib, EntryPoint = "submit_CompositionLayerQuad")]
+		public static extern void VIVEOpenXR_Submit_CompositionLayerQuad(XrCompositionLayerQuad quad, LayerType layerType, uint compositionDepth, int layerID);
+		/// <summary>
+		/// submit compostion layer of type quad.
+		/// </summary>
+		public void Submit_CompositionLayerQuad(XrCompositionLayerQuad quad, LayerType layerType, uint compositionDepth, int layerID)
+		{
+			VIVEOpenXR_Submit_CompositionLayerQuad(quad, layerType, compositionDepth, layerID);
+			return;
+		}
+		#endregion
+
+		#region Hook native functions
+		protected override IntPtr HookGetInstanceProcAddr(IntPtr func)
+		{
+			DEBUG("CompositionLayer_GetInstanceProcAddr");
+			return CompositionLayer_GetInstanceProcAddr(func);
+		}
+
+		[DllImport(ExtLib, EntryPoint = "compositionlayer_intercept_xrGetInstanceProcAddr")]
+		private static extern IntPtr CompositionLayer_GetInstanceProcAddr(IntPtr func);
+
+		[DllImportAttribute(ExtLib, EntryPoint = "compositionlayer_GetFuncAddrs")]
+		public static extern XrResult VIVEOpenXR_CompositionLayer_GetFuncAddrs(XrInstance xrInstance, IntPtr xrGetInstanceProcAddrFuncPtr);
+		/// <summary>
+		/// get function address of composition layer.
+		/// </summary>
+		public XrResult CompositionLayer_GetFuncAddrs(XrInstance xrInstance, IntPtr xrGetInstanceProcAddrFuncPtr)
+		{
+			return VIVEOpenXR_CompositionLayer_GetFuncAddrs(xrInstance, xrGetInstanceProcAddrFuncPtr);
+		}
+
+		#endregion
+	}
+}

Packages/com.htc.upm.vive.openxr/Runtime/Features/CompositionLayer/Scripts/ViveCompositionLayer.cs.meta

@@ -0,0 +1,11 @@
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Packages/com.htc.upm.vive.openxr/Runtime/Features/CompositionLayer/Scripts/ViveCompositionLayerColorScaleBias.cs

@@ -0,0 +1,89 @@
+// Copyright HTC Corporation All Rights Reserved.
+
+using System.Collections.Generic;
+using UnityEditor;
+using UnityEngine.XR.OpenXR;
+using UnityEngine.XR.OpenXR.Features;
+using AOT;
+using UnityEngine;
+using System;
+using System.Runtime.InteropServices;
+using System.Linq;
+
+#if UNITY_EDITOR
+using UnityEditor.XR.OpenXR.Features;
+#endif
+
+namespace VIVE.OpenXR.CompositionLayer
+{
+#if UNITY_EDITOR
+	[OpenXRFeature(UiName = "VIVE XR Composition Layer (Color Scale Bias)",
+		Desc = "Enable this feature to enable the Composition Layer Color Scale Bias Extension",
+		Company = "HTC",
+		DocumentationLink = "..\\Documentation",
+		OpenxrExtensionStrings = kOpenXRColorScaleBiasExtensionString,
+		Version = "1.0.0",
+		BuildTargetGroups = new[] { BuildTargetGroup.Android },
+		FeatureId = featureId
+	)]
+#endif
+	public class ViveCompositionLayerColorScaleBias : OpenXRFeature
+	{
+		const string LOG_TAG = "VIVE.OpenXR.ViveCompositionLayer.ColorScaleBias";
+		static void DEBUG(string msg) { Debug.Log(LOG_TAG + " " + msg); }
+		static void WARNING(string msg) { Debug.LogWarning(LOG_TAG + " " + msg); }
+		static void ERROR(string msg) { Debug.LogError(LOG_TAG + " " + msg); }
+
+		/// <summary>
+		/// The feature id string. This is used to give the feature a well known id for reference.
+		/// </summary>
+		public const string featureId = "vive.openxr.feature.compositionlayer.colorscalebias";
+
+		private const string kOpenXRColorScaleBiasExtensionString = "XR_KHR_composition_layer_color_scale_bias";
+
+		private bool m_ColorScaleBiasExtensionEnabled = true;
+		/// <summary>
+		/// The extension of "XR_KHR_composition_layer_color_scale_bias" is enabled or not.
+		/// </summary>
+		public bool ColorScaleBiasExtensionEnabled
+		{
+			get { return m_ColorScaleBiasExtensionEnabled; }
+		}
+
+
+		#region OpenXR Life Cycle
+		protected override bool OnInstanceCreate(ulong xrInstance)
+		{
+			if (!OpenXRRuntime.IsExtensionEnabled(kOpenXRColorScaleBiasExtensionString))
+			{
+				WARNING("OnInstanceCreate() " + kOpenXRColorScaleBiasExtensionString + " is NOT enabled.");
+
+				m_ColorScaleBiasExtensionEnabled = false;
+				return false;
+			}
+
+			return true;
+		}
+		#endregion
+
+		#region Wrapper Functions
+		private const string ExtLib = "viveopenxr";
+
+		[DllImportAttribute(ExtLib, EntryPoint = "submit_CompositionLayerColorBias")]
+		public static extern void VIVEOpenXR_Submit_CompositionLayerColorBias(XrCompositionLayerColorScaleBiasKHR colorBias, int layerID);
+		/// <summary>
+		/// Submit Compostion Layer Color Bias Settings to specific layer ID.
+		/// </summary>
+		public void Submit_CompositionLayerColorBias(XrCompositionLayerColorScaleBiasKHR colorBias, int layerID)
+		{
+			if (!ColorScaleBiasExtensionEnabled)
+			{
+				ERROR("Submit_CompositionLayerColorBias: " + kOpenXRColorScaleBiasExtensionString + " is not enabled.");
+				return;
+			}
+
+			VIVEOpenXR_Submit_CompositionLayerColorBias(colorBias, layerID);
+		}
+		#endregion
+	}
+}

Packages/com.htc.upm.vive.openxr/Runtime/Features/CompositionLayer/Scripts/ViveCompositionLayerColorScaleBias.cs.meta

@@ -0,0 +1,11 @@
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Packages/com.htc.upm.vive.openxr/Runtime/Features/CompositionLayer/Scripts/ViveCompositionLayerCylinder.cs

@@ -0,0 +1,88 @@
+// Copyright HTC Corporation All Rights Reserved.
+
+using System.Collections.Generic;
+using UnityEditor;
+using UnityEngine.XR.OpenXR;
+using UnityEngine.XR.OpenXR.Features;
+using AOT;
+using UnityEngine;
+using System;
+using System.Runtime.InteropServices;
+using System.Linq;
+
+#if UNITY_EDITOR
+using UnityEditor.XR.OpenXR.Features;
+#endif
+
+namespace VIVE.OpenXR.CompositionLayer
+{
+#if UNITY_EDITOR
+	[OpenXRFeature(UiName = "VIVE XR Composition Layer (Cylinder)",
+		Desc = "Enable this feature to enable the Composition Layer Cylinder Extension",
+		Company = "HTC",
+		DocumentationLink = "..\\Documentation",
+		OpenxrExtensionStrings = kOpenXRCylinderExtensionString,
+		Version = "1.0.0",
+		BuildTargetGroups = new[] { BuildTargetGroup.Android },
+		FeatureId = featureId
+	)]
+#endif
+	public class ViveCompositionLayerCylinder : OpenXRFeature
+	{
+		const string LOG_TAG = "VIVE.OpenXR.ViveCompositionLayer.Cylinder";
+		static void DEBUG(string msg) { Debug.Log(LOG_TAG + " " + msg); }
+		static void WARNING(string msg) { Debug.LogWarning(LOG_TAG + " " + msg); }
+		static void ERROR(string msg) { Debug.LogError(LOG_TAG + " " + msg); }
+
+		/// <summary>
+		/// The feature id string. This is used to give the feature a well known id for reference.
+		/// </summary>
+		public const string featureId = "vive.openxr.feature.compositionlayer.cylinder";
+
+		private const string kOpenXRCylinderExtensionString = "XR_KHR_composition_layer_cylinder";
+
+		private bool m_CylinderExtensionEnabled = true;
+		/// <summary>
+		/// The extension "XR_KHR_composition_layer_cylinder" is enabled or not.
+		/// </summary>
+		public bool CylinderExtensionEnabled
+		{
+			get { return m_CylinderExtensionEnabled; }
+		}
+
+
+		#region OpenXR Life Cycle
+		protected override bool OnInstanceCreate(ulong xrInstance)
+		{
+			if (!OpenXRRuntime.IsExtensionEnabled(kOpenXRCylinderExtensionString))
+			{
+				WARNING("OnInstanceCreate() " + kOpenXRCylinderExtensionString + " is NOT enabled.");
+
+				m_CylinderExtensionEnabled = false;
+				return false;
+			}
+
+			return true;
+		}
+		#endregion
+
+		#region Wrapper Functions
+		private const string ExtLib = "viveopenxr";
+
+		[DllImportAttribute(ExtLib, EntryPoint = "submit_CompositionLayerCylinder")]
+		public static extern void VIVEOpenXR_Submit_CompositionLayerCylinder(XrCompositionLayerCylinderKHR cylinder, LayerType layerType, uint compositionDepth, int layerID);
+		/// <summary>
+		/// submit compostion layer of type cylinder.
+		/// </summary>
+		public void Submit_CompositionLayerCylinder(XrCompositionLayerCylinderKHR cylinder, LayerType layerType, uint compositionDepth, int layerID)
+		{
+			if (!CylinderExtensionEnabled)
+			{
+				ERROR("Submit_CompositionLayerCylinder: " + kOpenXRCylinderExtensionString + " is NOT enabled.");
+			}
+
+			VIVEOpenXR_Submit_CompositionLayerCylinder(cylinder, layerType, compositionDepth, layerID);
+		}
+		#endregion
+	}
+}

Packages/com.htc.upm.vive.openxr/Runtime/Features/CompositionLayer/Scripts/ViveCompositionLayerCylinder.cs.meta

@@ -0,0 +1,11 @@
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Packages/com.htc.upm.vive.openxr/Runtime/Features/CompositionLayer/Scripts/ViveCompositionLayerEquirect.cs

@@ -0,0 +1,120 @@
+// Copyright HTC Corporation All Rights Reserved.
+
+using System.Collections.Generic;
+using UnityEditor;
+using UnityEngine.XR.OpenXR;
+using UnityEngine.XR.OpenXR.Features;
+using AOT;
+using UnityEngine;
+using System;
+using System.Runtime.InteropServices;
+using System.Linq;
+
+#if UNITY_EDITOR
+using UnityEditor.XR.OpenXR.Features;
+#endif
+
+namespace VIVE.OpenXR.CompositionLayer
+{
+#if UNITY_EDITOR
+	[OpenXRFeature(UiName = "VIVE XR Composition Layer (Equirect)",
+		Desc = "Enable this feature to enable the Composition Layer Equirect Extension",
+		Company = "HTC",
+		DocumentationLink = "..\\Documentation",
+		OpenxrExtensionStrings = kOpenXRCylinderExtensionString,
+		Version = "1.0.0",
+		BuildTargetGroups = new[] { BuildTargetGroup.Android },
+		FeatureId = featureId
+	)]
+#endif
+	public class ViveCompositionLayerEquirect : OpenXRFeature
+	{
+		const string LOG_TAG = "VIVE.OpenXR.ViveCompositionLayer.Equirect";
+		static void DEBUG(string msg) { Debug.Log(LOG_TAG + " " + msg); }
+		static void WARNING(string msg) { Debug.LogWarning(LOG_TAG + " " + msg); }
+		static void ERROR(string msg) { Debug.LogError(LOG_TAG + " " + msg); }
+
+		/// <summary>
+		/// The feature id string. This is used to give the feature a well known id for reference.
+		/// </summary>
+		public const string featureId = "vive.openxr.feature.compositionlayer.equirect";
+
+		private const string kOpenXRCylinderExtensionString = "XR_KHR_composition_layer_equirect XR_KHR_composition_layer_equirect2";
+
+		private bool m_EquirectExtensionEnabled = true;
+		/// <summary>
+		/// The extension "XR_KHR_composition_layer_equirect" is enabled or not.
+		/// </summary>
+		public bool EquirectExtensionEnabled
+		{
+			get { return m_EquirectExtensionEnabled; }
+		}
+
+		private bool m_Equirect2ExtensionEnabled = true;
+		/// <summary>
+		/// The extension "XR_KHR_composition_layer_equirect2" is enabled or not.
+		/// </summary>
+		public bool Equirect2ExtensionEnabled
+		{
+			get { return m_Equirect2ExtensionEnabled; }
+		}
+
+
+		#region OpenXR Life Cycle
+		protected override bool OnInstanceCreate(ulong xrInstance)
+		{
+			if (!OpenXRRuntime.IsExtensionEnabled("XR_KHR_composition_layer_equirect"))
+			{
+				WARNING("OnInstanceCreate() " + "XR_KHR_composition_layer_equirect" + " is NOT enabled.");
+
+				m_EquirectExtensionEnabled = false;
+				return false;
+			}
+			
+			if (!OpenXRRuntime.IsExtensionEnabled("XR_KHR_composition_layer_equirect2"))
+			{
+				WARNING("OnInstanceCreate() " + "XR_KHR_composition_layer_equirect2" + " is NOT enabled.");
+
+				m_Equirect2ExtensionEnabled = false;
+				return false;
+			}
+
+			return true;
+		}
+		#endregion
+
+		#region Wrapper Functions
+		private const string ExtLib = "viveopenxr";
+
+		[DllImportAttribute(ExtLib, EntryPoint = "submit_CompositionLayerEquirect")]
+		public static extern void VIVEOpenXR_Submit_CompositionLayerEquirect(XrCompositionLayerEquirectKHR equirect, LayerType layerType, uint compositionDepth, int layerID);
+		/// <summary>
+		/// submit compostion layer of type equirect.
+		/// </summary>
+		public void Submit_CompositionLayerEquirect(XrCompositionLayerEquirectKHR equirect, LayerType layerType, uint compositionDepth, int layerID)
+		{
+			if (!EquirectExtensionEnabled)
+			{
+				ERROR("Submit_CompositionLayerEquirect: " + "XR_KHR_composition_layer_equirect" + " is NOT enabled.");
+			}
+
+			VIVEOpenXR_Submit_CompositionLayerEquirect(equirect, layerType, compositionDepth, layerID);
+		}
+		
+		[DllImportAttribute(ExtLib, EntryPoint = "submit_CompositionLayerEquirect2")]
+		public static extern void VIVEOpenXR_Submit_CompositionLayerEquirect2(XrCompositionLayerEquirect2KHR equirect2, LayerType layerType, uint compositionDepth, int layerID);
+		/// <summary>
+		/// submit compostion layer of type equirect2.
+		/// </summary>
+		public void Submit_CompositionLayerEquirect2(XrCompositionLayerEquirect2KHR equirect2, LayerType layerType, uint compositionDepth, int layerID)
+		{
+			if (!Equirect2ExtensionEnabled)
+			{
+				ERROR("Submit_CompositionLayerEquirect2: " + "XR_KHR_composition_layer_equirect2" + " is NOT enabled.");
+			}
+
+			VIVEOpenXR_Submit_CompositionLayerEquirect2(equirect2, layerType, compositionDepth, layerID);
+		}
+		#endregion
+	}
+}

Packages/com.htc.upm.vive.openxr/Runtime/Features/CompositionLayer/Scripts/ViveCompositionLayerEquirect.cs.meta

@@ -0,0 +1,11 @@
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+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
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+  assetBundleName: 
+  assetBundleVariant: 

Packages/com.htc.upm.vive.openxr/Runtime/Features/CompositionLayer/Scripts/ViveCompositionLayerExtraSettings.cs

@@ -0,0 +1,203 @@
+// Copyright HTC Corporation All Rights Reserved.
+
+using UnityEditor;
+using UnityEngine.XR.OpenXR;
+using UnityEngine.XR.OpenXR.Features;
+using UnityEngine;
+using System;
+using System.Runtime.InteropServices;
+
+#if UNITY_EDITOR
+using UnityEditor.XR.OpenXR.Features;
+#endif
+
+namespace VIVE.OpenXR.CompositionLayer
+{
+#if UNITY_EDITOR
+	[OpenXRFeature(UiName = "VIVE XR Composition Layer (Extra Settings) (Beta)",
+		Desc = "Enable this feature to use the Composition Layer Extra Settings.",
+		Company = "HTC",
+		DocumentationLink = "..\\Documentation",
+		OpenxrExtensionStrings = kOpenxrExtensionStrings,
+		Version = "1.0.0",
+		BuildTargetGroups = new[] { BuildTargetGroup.Android },
+		FeatureId = featureId
+	)]
+#endif
+	public class ViveCompositionLayerExtraSettings : OpenXRFeature
+	{
+		const string LOG_TAG = "VIVE.OpenXR.ViveCompositionLayer.ExtraSettings";
+		static void DEBUG(string msg) { Debug.Log(LOG_TAG + " " + msg); }
+		static void WARNING(string msg) { Debug.LogWarning(LOG_TAG + " " + msg); }
+		static void ERROR(string msg) { Debug.LogError(LOG_TAG + " " + msg); }
+
+		/// <summary>
+		/// Settings Editor Enable Sharpening or Not.
+		/// </summary>
+		public bool SettingsEditorEnableSharpening = false;
+
+		/// <summary>
+		/// Support Sharpening or Not.
+		/// </summary>
+		public bool supportSharpening = false;
+
+		/// <summary>
+		/// Settings Editor Sharpening Mode
+		/// </summary>
+		public XrSharpeningModeHTC SettingsEditorSharpeningMode = XrSharpeningModeHTC.FAST;
+
+		/// <summary>
+		/// Settings Editor Sharpening Levell
+		/// </summary>
+		[Range(0.0f, 1.0f)]
+		public float SettingsEditorSharpeningLevel = 1.0f;
+
+		/// <summary>
+		/// The feature id string. This is used to give the feature a well known id for reference.
+		/// </summary>
+		public const string featureId = "vive.openxr.feature.compositionlayer.extrasettings";
+
+		/// <summary>
+		/// OpenXR specification.
+		/// </summary>
+		public const string kOpenxrExtensionStrings = "XR_HTC_composition_layer_extra_settings";
+
+		#region OpenXR Life Cycle
+		private bool m_XrInstanceCreated = false;
+		/// <summary>
+		/// The XR instance is created or not.
+		/// </summary>
+		public bool XrInstanceCreated
+		{
+			get { return m_XrInstanceCreated; }
+		}
+		private XrInstance m_XrInstance = 0;
+		protected override bool OnInstanceCreate(ulong xrInstance)
+		{
+			foreach (string kOpenxrExtensionString in kOpenxrExtensionStrings.Split(' '))
+			{
+				if (!OpenXRRuntime.IsExtensionEnabled(kOpenxrExtensionString))
+				{
+					WARNING("OnInstanceCreate() " + kOpenxrExtensionString + " is NOT enabled.");
+				}
+			}
+
+			m_XrInstanceCreated = true;
+			m_XrInstance = xrInstance;
+			DEBUG("OnInstanceCreate() " + m_XrInstance);
+
+			return true;
+		}
+
+		protected override void OnInstanceDestroy(ulong xrInstance)
+		{
+			m_XrInstanceCreated = false;
+			DEBUG("OnInstanceDestroy() " + m_XrInstance);
+		}
+
+		private XrSystemId m_XrSystemId = 0;
+		protected override void OnSystemChange(ulong xrSystem)
+		{
+			m_XrSystemId = xrSystem;
+			DEBUG("OnSystemChange() " + m_XrSystemId);
+		}
+
+		private bool m_XrSessionCreated = false;
+		/// <summary>
+		/// The XR session is created or not.
+		/// </summary>
+		public bool XrSessionCreated
+		{
+			get { return m_XrSessionCreated; }
+		}
+		private XrSession m_XrSession = 0;
+		protected override void OnSessionCreate(ulong xrSession)
+		{
+			m_XrSession = xrSession;
+			m_XrSessionCreated = true;
+			DEBUG("OnSessionCreate() " + m_XrSession);
+		}
+
+		private bool m_XrSessionEnding = false;
+		/// <summary>
+		/// The XR session is ending or not.
+		/// </summary>
+		public bool XrSessionEnding
+		{
+			get { return m_XrSessionEnding; }
+		}
+
+		protected override void OnSessionBegin(ulong xrSession)
+		{
+			m_XrSessionEnding = false;
+			DEBUG("OnSessionBegin() " + m_XrSession);
+
+			//enable Sharpening 
+			if (OpenXRRuntime.IsExtensionEnabled("XR_HTC_composition_layer_extra_settings"))
+			{
+				ViveCompositionLayer_UpdateSystemProperties(m_XrInstance, m_XrSystemId);
+				supportSharpening = ViveCompositionLayer_IsSupportSharpening();
+				if (supportSharpening && SettingsEditorEnableSharpening)
+				{
+					EnableSharpening(SettingsEditorSharpeningMode, SettingsEditorSharpeningLevel);
+				}
+			}
+		}
+
+		protected override void OnSessionEnd(ulong xrSession)
+		{
+			m_XrSessionEnding = true;
+			DEBUG("OnSessionEnd() " + m_XrSession);
+		}
+
+		protected override void OnSessionDestroy(ulong xrSession)
+		{
+			m_XrSessionCreated = false;
+			DEBUG("OnSessionDestroy() " + xrSession);
+		}
+
+		#endregion
+
+		#region Wrapper Functions
+		private const string ExtLib = "viveopenxr";
+
+		[DllImportAttribute(ExtLib, EntryPoint = "viveCompositionLayer_UpdateSystemProperties")]
+		private static extern int VIVEOpenXR_ViveCompositionLayer_UpdateSystemProperties(XrInstance instance, XrSystemId system_id);
+		private int ViveCompositionLayer_UpdateSystemProperties(XrInstance instance, XrSystemId system_id)
+		{
+			return VIVEOpenXR_ViveCompositionLayer_UpdateSystemProperties(instance, system_id);
+		}
+
+		[DllImportAttribute(ExtLib, EntryPoint = "viveCompositionLayer_IsSupportSharpening")]
+		private static extern bool VIVEOpenXR_ViveCompositionLayer_IsSupportSharpening();
+		private bool ViveCompositionLayer_IsSupportSharpening()
+		{
+			return VIVEOpenXR_ViveCompositionLayer_IsSupportSharpening();
+		}
+
+		[DllImportAttribute(ExtLib, EntryPoint = "viveCompositionLayer_enableSharpening")]
+		private static extern int VIVEOpenXR_ViveCompositionLayer_enableSharpening(XrSharpeningModeHTC sharpeningMode, float sharpeningLevel);
+		/// <summary>
+		/// Enable the sharpening setting applying to the projection layer.
+		/// </summary>
+		/// <param name="sharpeningMode">The sharpening mode in <see cref="XrSharpeningModeHTC"/>.</param>
+		/// <param name="sharpeningLevel">The sharpening level in float [0, 1].</param>
+		/// <returns>True for success.</returns>
+		public bool EnableSharpening(XrSharpeningModeHTC sharpeningMode, float sharpeningLevel)
+		{
+			return (VIVEOpenXR_ViveCompositionLayer_enableSharpening(sharpeningMode, sharpeningLevel) == 0);
+		}
+
+		[DllImportAttribute(ExtLib, EntryPoint = "viveCompositionLayer_disableSharpening")]
+		private static extern int VIVEOpenXR_ViveCompositionLayer_DisableSharpening();
+		/// <summary>
+		/// Disable the sharpening setting on the projection layer.
+		/// </summary>
+		/// <returns>True for success</returns>
+		public bool DisableSharpening()
+		{
+			return (VIVEOpenXR_ViveCompositionLayer_DisableSharpening() == 0);
+		}
+		#endregion
+	}
+}

Packages/com.htc.upm.vive.openxr/Runtime/Features/CompositionLayer/Scripts/ViveCompositionLayerExtraSettings.cs.meta

@@ -0,0 +1,11 @@
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Packages/com.htc.upm.vive.openxr/Runtime/Features/CompositionLayer/Scripts/ViveCompositionLayerHelper.cs

@@ -0,0 +1,583 @@
+// Copyright HTC Corporation All Rights Reserved.
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.InteropServices;
+
+namespace VIVE.OpenXR.CompositionLayer
+{
+	public struct XrSwapchain : IEquatable<ulong>
+	{
+		private readonly ulong value;
+
+		public XrSwapchain(ulong u)
+		{
+			value = u;
+		}
+
+		public static implicit operator ulong(XrSwapchain xrBool)
+		{
+			return xrBool.value;
+		}
+		public static implicit operator XrSwapchain(ulong u)
+		{
+			return new XrSwapchain(u);
+		}
+
+		public bool Equals(XrSwapchain other)
+		{
+			return value == other.value;
+		}
+		public bool Equals(ulong other)
+		{
+			return value == other;
+		}
+		public override bool Equals(object obj)
+		{
+			return obj is XrSwapchain && Equals((XrSwapchain)obj);
+		}
+
+		public override int GetHashCode()
+		{
+			return value.GetHashCode();
+		}
+
+		public override string ToString()
+		{
+			return value.ToString();
+		}
+
+		public static bool operator ==(XrSwapchain a, XrSwapchain b) { return a.Equals(b); }
+		public static bool operator !=(XrSwapchain a, XrSwapchain b) { return !a.Equals(b); }
+		public static bool operator >=(XrSwapchain a, XrSwapchain b) { return a.value >= b.value; }
+		public static bool operator <=(XrSwapchain a, XrSwapchain b) { return a.value <= b.value; }
+		public static bool operator >(XrSwapchain a, XrSwapchain b) { return a.value > b.value; }
+		public static bool operator <(XrSwapchain a, XrSwapchain b) { return a.value < b.value; }
+		public static XrSwapchain operator +(XrSwapchain a, XrSwapchain b) { return a.value + b.value; }
+		public static XrSwapchain operator -(XrSwapchain a, XrSwapchain b) { return a.value - b.value; }
+		public static XrSwapchain operator *(XrSwapchain a, XrSwapchain b) { return a.value * b.value; }
+		public static XrSwapchain operator /(XrSwapchain a, XrSwapchain b)
+		{
+			if (b.value == 0)
+			{
+				throw new DivideByZeroException();
+			}
+			return a.value / b.value;
+		}
+
+	}
+
+	public struct XrSwapchainCreateFlags : IEquatable<UInt64>
+	{
+		private readonly UInt64 value;
+
+		public XrSwapchainCreateFlags(UInt64 u)
+		{
+			value = u;
+		}
+
+		public static implicit operator UInt64(XrSwapchainCreateFlags xrBool)
+		{
+			return xrBool.value;
+		}
+		public static implicit operator XrSwapchainCreateFlags(UInt64 u)
+		{
+			return new XrSwapchainCreateFlags(u);
+		}
+
+		public bool Equals(XrSwapchainCreateFlags other)
+		{
+			return value == other.value;
+		}
+		public bool Equals(UInt64 other)
+		{
+			return value == other;
+		}
+		public override bool Equals(object obj)
+		{
+			return obj is XrSwapchainCreateFlags && Equals((XrSwapchainCreateFlags)obj);
+		}
+
+		public override int GetHashCode()
+		{
+			return value.GetHashCode();
+		}
+
+		public override string ToString()
+		{
+			return value.ToString();
+		}
+
+		public static bool operator ==(XrSwapchainCreateFlags a, XrSwapchainCreateFlags b) { return a.Equals(b); }
+		public static bool operator !=(XrSwapchainCreateFlags a, XrSwapchainCreateFlags b) { return !a.Equals(b); }
+		public static bool operator >=(XrSwapchainCreateFlags a, XrSwapchainCreateFlags b) { return a.value >= b.value; }
+		public static bool operator <=(XrSwapchainCreateFlags a, XrSwapchainCreateFlags b) { return a.value <= b.value; }
+		public static bool operator >(XrSwapchainCreateFlags a, XrSwapchainCreateFlags b) { return a.value > b.value; }
+		public static bool operator <(XrSwapchainCreateFlags a, XrSwapchainCreateFlags b) { return a.value < b.value; }
+		public static XrSwapchainCreateFlags operator +(XrSwapchainCreateFlags a, XrSwapchainCreateFlags b) { return a.value + b.value; }
+		public static XrSwapchainCreateFlags operator -(XrSwapchainCreateFlags a, XrSwapchainCreateFlags b) { return a.value - b.value; }
+		public static XrSwapchainCreateFlags operator *(XrSwapchainCreateFlags a, XrSwapchainCreateFlags b) { return a.value * b.value; }
+		public static XrSwapchainCreateFlags operator /(XrSwapchainCreateFlags a, XrSwapchainCreateFlags b)
+		{
+			if (b.value == 0)
+			{
+				throw new DivideByZeroException();
+			}
+			return a.value / b.value;
+		}
+	}
+
+	public struct XrSwapchainUsageFlags : IEquatable<UInt64>
+	{
+		private readonly UInt64 value;
+
+		public XrSwapchainUsageFlags(UInt64 u)
+		{
+			value = u;
+		}
+
+		public static implicit operator UInt64(XrSwapchainUsageFlags xrBool)
+		{
+			return xrBool.value;
+		}
+		public static implicit operator XrSwapchainUsageFlags(UInt64 u)
+		{
+			return new XrSwapchainUsageFlags(u);
+		}
+
+		public bool Equals(XrSwapchainUsageFlags other)
+		{
+			return value == other.value;
+		}
+		public bool Equals(UInt64 other)
+		{
+			return value == other;
+		}
+		public override bool Equals(object obj)
+		{
+			return obj is XrSwapchainUsageFlags && Equals((XrSwapchainUsageFlags)obj);
+		}
+
+		public override int GetHashCode()
+		{
+			return value.GetHashCode();
+		}
+
+		public override string ToString()
+		{
+			return value.ToString();
+		}
+
+		public static bool operator ==(XrSwapchainUsageFlags a, XrSwapchainUsageFlags b) { return a.Equals(b); }
+		public static bool operator !=(XrSwapchainUsageFlags a, XrSwapchainUsageFlags b) { return !a.Equals(b); }
+		public static bool operator >=(XrSwapchainUsageFlags a, XrSwapchainUsageFlags b) { return a.value >= b.value; }
+		public static bool operator <=(XrSwapchainUsageFlags a, XrSwapchainUsageFlags b) { return a.value <= b.value; }
+		public static bool operator >(XrSwapchainUsageFlags a, XrSwapchainUsageFlags b) { return a.value > b.value; }
+		public static bool operator <(XrSwapchainUsageFlags a, XrSwapchainUsageFlags b) { return a.value < b.value; }
+		public static XrSwapchainUsageFlags operator +(XrSwapchainUsageFlags a, XrSwapchainUsageFlags b) { return a.value + b.value; }
+		public static XrSwapchainUsageFlags operator -(XrSwapchainUsageFlags a, XrSwapchainUsageFlags b) { return a.value - b.value; }
+		public static XrSwapchainUsageFlags operator *(XrSwapchainUsageFlags a, XrSwapchainUsageFlags b) { return a.value * b.value; }
+		public static XrSwapchainUsageFlags operator /(XrSwapchainUsageFlags a, XrSwapchainUsageFlags b)
+		{
+			if (b.value == 0)
+			{
+				throw new DivideByZeroException();
+			}
+			return a.value / b.value;
+		}
+	}
+
+	[StructLayout(LayoutKind.Sequential)]
+	public struct XrCompositionLayerQuad
+	{
+		public XrStructureType type;
+		public IntPtr next;
+		public XrCompositionLayerFlags layerFlags;
+		public XrSpace space;
+		public XrEyeVisibility eyeVisibility;
+		public XrSwapchainSubImage subImage;
+		public XrPosef pose;
+		public XrExtent2Df size;
+	}
+	[StructLayout(LayoutKind.Sequential)]
+	public struct XrCompositionLayerCylinderKHR
+	{
+		public XrStructureType type;
+		public IntPtr next;
+		public XrCompositionLayerFlags layerFlags;
+		public XrSpace space;
+		public XrEyeVisibility eyeVisibility;
+		public XrSwapchainSubImage subImage;
+		public XrPosef pose;
+		public float radius;
+		public float centralAngle;
+		public float aspectRatio;
+	}
+	[StructLayout(LayoutKind.Sequential)]
+	public struct XrCompositionLayerEquirectKHR
+	{
+		public XrStructureType type;
+		public IntPtr next;
+		public XrCompositionLayerFlags layerFlags;
+		public XrSpace space;
+		public XrEyeVisibility eyeVisibility;
+		public XrSwapchainSubImage subImage;
+		public XrPosef pose;
+		public float radius;
+		public XrVector2f scale;
+		public XrVector2f bias;
+	}
+	[StructLayout(LayoutKind.Sequential)]
+	public struct XrCompositionLayerEquirect2KHR
+	{
+		public XrStructureType type;
+		public IntPtr next;
+		public XrCompositionLayerFlags layerFlags;
+		public XrSpace space;
+		public XrEyeVisibility eyeVisibility;
+		public XrSwapchainSubImage subImage;
+		public XrPosef pose;
+		public float radius;
+		public float centralHorizontalAngle;
+		public float upperVerticalAngle;
+		public float lowerVerticalAngle;
+	}
+	[StructLayout(LayoutKind.Sequential)]
+	public struct XrSwapchainSubImage
+	{
+		public XrSwapchain swapchain;
+		public XrRect2Di imageRect;
+		public uint imageArrayIndex;
+	}
+	[StructLayout(LayoutKind.Sequential)]
+	public struct XrCompositionLayerColorScaleBiasKHR
+	{
+		public XrStructureType type;
+		public IntPtr next;
+		public XrColor4f colorScale;
+		public XrColor4f colorBias;
+	}
+	[StructLayout(LayoutKind.Sequential)]
+	public struct XrCompositionLayerSharpeningSettingHTC
+	{
+        public XrStructureType type;
+        public IntPtr next;
+        public XrSharpeningModeHTC mode;
+        public float sharpeningLevel;
+    }
+	[StructLayout(LayoutKind.Sequential)]
+    public struct XrCompositionLayerSuperSamplingSettingHTC
+	{
+        public XrStructureType type;
+        public IntPtr next;
+        public XrSuperSamplingModeHTC mode;
+    }
+	public enum XrSharpeningModeHTC
+	{
+        FAST = 0,
+        NORMAL = 1,
+        QUALITY = 2,
+        AUTOMATIC = 3,
+	}
+	public enum XrSuperSamplingModeHTC
+	{
+        FAST = 0,
+        NORMAL = 1,
+        QUALITY = 2,
+        AUTOMATIC = 3,
+    }
+
+	public enum GraphicsAPI
+	{
+		GLES3	= 1,
+		Vulkan	= 2
+	}
+	public enum LayerType
+	{
+		///<summary> Overlays are composition layers rendered after the projection layer </summary>
+		Overlay = 1,
+		///<summary> Underlays are composition layers rendered before the projection layer </summary>
+		Underlay = 2
+	}
+
+	/// <summary>
+	/// An application can create an <see cref="XrPassthroughHTC">XrPassthroughHTC</see> handle by calling <see cref="ViveCompositionLayerHelper.xrCreatePassthroughHTC">xrCreatePassthroughHTC</see>. The returned passthrough handle can be subsequently used in API calls.
+	/// </summary>
+	public struct XrPassthroughHTC : IEquatable<UInt64>
+	{
+		private readonly UInt64 value;
+
+		public XrPassthroughHTC(UInt64 u)
+		{
+			value = u;
+		}
+
+		public static implicit operator UInt64(XrPassthroughHTC equatable)
+		{
+			return equatable.value;
+		}
+		public static implicit operator XrPassthroughHTC(UInt64 u)
+		{
+			return new XrPassthroughHTC(u);
+		}
+
+		public bool Equals(XrPassthroughHTC other)
+		{
+			return value == other.value;
+		}
+		public bool Equals(UInt64 other)
+		{
+			return value == other;
+		}
+		public override bool Equals(object obj)
+		{
+			return obj is XrPassthroughHTC && Equals((XrPassthroughHTC)obj);
+		}
+
+		public override int GetHashCode()
+		{
+			return value.GetHashCode();
+		}
+
+		public override string ToString()
+		{
+			return value.ToString();
+		}
+
+		public static bool operator ==(XrPassthroughHTC a, XrPassthroughHTC b) { return a.Equals(b); }
+		public static bool operator !=(XrPassthroughHTC a, XrPassthroughHTC b) { return !a.Equals(b); }
+		public static bool operator >=(XrPassthroughHTC a, XrPassthroughHTC b) { return a.value >= b.value; }
+		public static bool operator <=(XrPassthroughHTC a, XrPassthroughHTC b) { return a.value <= b.value; }
+		public static bool operator >(XrPassthroughHTC a, XrPassthroughHTC b) { return a.value > b.value; }
+		public static bool operator <(XrPassthroughHTC a, XrPassthroughHTC b) { return a.value < b.value; }
+		public static XrPassthroughHTC operator +(XrPassthroughHTC a, XrPassthroughHTC b) { return a.value + b.value; }
+		public static XrPassthroughHTC operator -(XrPassthroughHTC a, XrPassthroughHTC b) { return a.value - b.value; }
+		public static XrPassthroughHTC operator *(XrPassthroughHTC a, XrPassthroughHTC b) { return a.value * b.value; }
+		public static XrPassthroughHTC operator /(XrPassthroughHTC a, XrPassthroughHTC b)
+		{
+			if (b.value == 0)
+			{
+				throw new DivideByZeroException();
+			}
+			return a.value / b.value;
+		}
+
+	}
+
+	/// <summary>
+	/// The XrPassthroughFormHTC enumeration identifies the form of the passthrough, presenting the passthrough fill the full screen or project onto a specified mesh.
+	/// </summary>
+	public enum XrPassthroughFormHTC
+	{
+		/// <summary>
+		/// Presents the passthrough with full of the entire screen..
+		/// </summary>
+		XR_PASSTHROUGH_FORM_PLANAR_HTC = 0,
+		/// <summary>
+		/// Presents the passthrough projecting onto a custom mesh.
+		/// </summary>
+		XR_PASSTHROUGH_FORM_PROJECTED_HTC = 1,
+	};
+
+	/// <summary>
+	/// The XrPassthroughCreateInfoHTC structure describes the information to create an <see cref="XrPassthroughCreateInfoHTC">XrPassthroughCreateInfoHTC</see> handle.
+	/// </summary>
+	[StructLayout(LayoutKind.Sequential)]
+	public struct XrPassthroughCreateInfoHTC
+	{
+		/// <summary>
+		/// The <see cref="XrStructureType">XrStructureType</see> of this structure.
+		/// </summary>
+		public XrStructureType type;
+		/// <summary>
+		/// NULL or a pointer to the next structure in a structure chain. No such structures are defined in core OpenXR or this extension.
+		/// </summary>
+		public IntPtr next;
+		/// <summary>
+		/// The form specifies the form of passthrough.
+		/// </summary>
+		public XrPassthroughFormHTC form;
+
+		/// <param name="in_type">The <see cref="XrStructureType">XrStructureType</see> of this structure.</param>
+		/// <param name="in_next">NULL or a pointer to the next structure in a structure chain. No such structures are defined in core OpenXR or this extension.</param>
+		/// <param name="in_facialTrackingType">An XrFacialTrackingTypeHTC which describes which type of facial tracking should be used for this handle.</param>
+		public XrPassthroughCreateInfoHTC(XrStructureType in_type, IntPtr in_next, XrPassthroughFormHTC in_form)
+		{
+			type = in_type;
+			next = in_next;
+			form = in_form;
+		}
+	};
+	/// <summary>
+	/// The application can specify the XrPassthroughColorHTC to adjust the alpha value of the passthrough. The range is between 0.0f and 1.0f, 1.0f means opaque.
+	/// </summary>
+	[StructLayout(LayoutKind.Sequential)]
+	public struct XrPassthroughColorHTC
+	{
+		/// <summary>
+		/// The XrStructureType of this structure.
+		/// </summary>
+		public XrStructureType type;
+		/// <summary>
+		/// Next is NULL or a pointer to the next structure in a structure chain, such as XrPassthroughMeshTransformInfoHTC.
+		/// </summary>
+		public IntPtr next;
+		/// <summary>
+		/// The alpha value of the passthrough in the range [0, 1].
+		/// </summary>
+		public float alpha;
+		public XrPassthroughColorHTC(XrStructureType in_type, IntPtr in_next, float in_alpha)
+        {
+			type = in_type;
+			next = in_next;
+			alpha = in_alpha;
+		}
+	};
+	/// <summary>
+	/// A pointer to XrCompositionLayerPassthroughHTC may be submitted in xrEndFrame as a pointer to the base structure XrCompositionLayerBaseHeader, in the desired layer order, to request the runtime to composite a passthrough layer into the final frame output.
+	/// </summary>
+	[StructLayout(LayoutKind.Sequential)]
+	public struct XrCompositionLayerPassthroughHTC
+	{
+		/// <summary>
+		/// The XrStructureType of this structure.
+		/// </summary>
+		public XrStructureType type;
+		/// <summary>
+		/// Next is NULL or a pointer to the next structure in a structure chain, such as XrPassthroughMeshTransformInfoHTC.
+		/// </summary>
+		public IntPtr next;
+		/// <summary>
+		/// A bitmask of XrCompositionLayerFlagBits describing flags to apply to the layer.
+		/// </summary>
+		public XrCompositionLayerFlags layerFlags;
+		/// <summary>
+		/// The XrSpace that specifies the layer’s space - must be XR_NULL_HANDLE.
+		/// </summary>
+		public XrSpace space;
+		/// <summary>
+		/// The XrPassthroughHTC previously created by xrCreatePassthroughHTC.
+		/// </summary>
+		public XrPassthroughHTC passthrough;
+		/// <summary>
+		/// The XrPassthroughColorHTC describing the color information with the alpha value of the passthrough layer.
+		/// </summary>
+		public XrPassthroughColorHTC color;
+		public XrCompositionLayerPassthroughHTC(XrStructureType in_type, IntPtr in_next, XrCompositionLayerFlags in_layerFlags,
+			XrSpace in_space, XrPassthroughHTC in_passthrough, XrPassthroughColorHTC in_color)
+		{
+			type = in_type;
+			next = in_next;
+			layerFlags = in_layerFlags;
+			space = in_space;
+			passthrough = in_passthrough;
+			color = in_color;
+		}
+	};
+
+	/// <summary>
+	/// The XrPassthroughMeshTransformInfoHTC structure describes the mesh and transformation.
+	/// </summary>
+	[StructLayout(LayoutKind.Sequential)]
+	public struct XrPassthroughMeshTransformInfoHTC
+	{
+		/// <summary>
+		/// The XrStructureType of this structure.
+		/// </summary>
+		public XrStructureType type;
+		/// <summary>
+		/// Next is NULL or a pointer to the next structure in a structure chain.
+		/// </summary>
+		public IntPtr next;
+		/// <summary>
+		/// The count of vertices array in the mesh.
+		/// </summary>
+		public UInt32 vertexCount;
+		/// <summary>
+		/// An array of XrVector3f. The size of the array must be equal to vertexCount.
+		/// </summary>
+		public XrVector3f[] vertices;
+		/// <summary>
+		/// The count of indices array in the mesh.
+		/// </summary>
+		public UInt32 indexCount;
+		/// <summary>
+		/// An array of triangle indices. The size of the array must be equal to indexCount.
+		/// </summary>
+		public UInt32[] indices;
+		/// <summary>
+		/// The XrSpace that defines the projected passthrough's base space for transformations.
+		/// </summary>
+		public XrSpace baseSpace;
+		/// <summary>
+		/// The XrTime that defines the time at which the transform is applied.
+		/// </summary>
+		public XrTime time;
+		/// <summary>
+		/// The XrPosef that defines the pose of the mesh
+		/// </summary>
+		public XrPosef pose;
+		/// <summary>
+		/// The XrVector3f that defines the scale of the mesh
+		/// </summary>
+		public XrVector3f scale;
+		public XrPassthroughMeshTransformInfoHTC(XrStructureType in_type, IntPtr in_next, UInt32 in_vertexCount,
+			XrVector3f[] in_vertices, UInt32 in_indexCount, UInt32[] in_indices, XrSpace in_baseSpace, XrTime in_time,
+			XrPosef in_pose, XrVector3f in_scale)
+		{
+			type = in_type;
+			next = in_next;
+			vertexCount = in_vertexCount;
+			vertices = in_vertices;
+			indexCount = in_indexCount;
+			indices = in_indices;
+			baseSpace = in_baseSpace;
+			time = in_time;
+			pose = in_pose;
+			scale = in_scale;
+		}
+	};
+
+	public static class ViveCompositionLayerHelper
+	{
+		/// <summary>
+		/// The delegate function of <see href="https://registry.khronos.org/OpenXR/specs/1.0/html/xrspec.html#xrCreatePassthroughHTC">xrCreatePassthroughHTC</see>.
+		/// </summary>
+		/// <param name="session">An <see cref="XrSession">XrSession</see>  in which the passthrough will be active.</param>
+		/// <param name="createInfo">createInfo is a pointer to an <see cref="XrPassthroughCreateInfoHTC">XrPassthroughCreateInfoHTC</see> structure containing information about how to create the passthrough.</param>
+		/// <param name="passthrough">passthrough is a pointer to a handle in which the created <see cref="XrPassthroughHTC">XrPassthroughHTC</see> is returned.</param>
+		/// <returns>XR_SUCCESS for success.</returns>
+		public delegate XrResult xrCreatePassthroughHTCDelegate(
+			XrSession session,
+			XrPassthroughCreateInfoHTC createInfo,
+			out XrPassthroughHTC passthrough);
+
+		/// <summary>
+		/// The delegate function of <see href="https://registry.khronos.org/OpenXR/specs/1.0/html/xrspec.html#xrDestroyPassthroughHTC">xrDestroyFacialTrackerHTC</see>.
+		/// </summary>
+		/// <param name="passthrough">passthrough is the <see cref="XrPassthroughHTC">XrPassthroughHTC</see> to be destroyed..</param>
+		/// <returns>XR_SUCCESS for success.</returns>
+		public delegate XrResult xrDestroyPassthroughHTCDelegate(
+			XrPassthroughHTC passthrough);
+		// Flag bits for XrCompositionLayerFlags
+		public static XrCompositionLayerFlags XR_COMPOSITION_LAYER_CORRECT_CHROMATIC_ABERRATION_BIT = 0x00000001;
+		public static XrCompositionLayerFlags XR_COMPOSITION_LAYER_BLEND_TEXTURE_SOURCE_ALPHA_BIT = 0x00000002;
+		public static XrCompositionLayerFlags XR_COMPOSITION_LAYER_UNPREMULTIPLIED_ALPHA_BIT = 0x00000004;
+
+		// Flag bits for XrSwapchainCreateFlags
+		public static XrSwapchainCreateFlags XR_SWAPCHAIN_CREATE_PROTECTED_CONTENT_BIT = 0x00000001;
+		public static XrSwapchainCreateFlags XR_SWAPCHAIN_CREATE_STATIC_IMAGE_BIT = 0x00000002;
+
+		// Flag bits for XrSwapchainUsageFlags
+		public static XrSwapchainUsageFlags XR_SWAPCHAIN_USAGE_COLOR_ATTACHMENT_BIT = 0x00000001;
+		public static XrSwapchainUsageFlags XR_SWAPCHAIN_USAGE_DEPTH_STENCIL_ATTACHMENT_BIT = 0x00000002;
+		public static XrSwapchainUsageFlags XR_SWAPCHAIN_USAGE_UNORDERED_ACCESS_BIT = 0x00000004;
+		public static XrSwapchainUsageFlags XR_SWAPCHAIN_USAGE_TRANSFER_SRC_BIT = 0x00000008;
+		public static XrSwapchainUsageFlags XR_SWAPCHAIN_USAGE_TRANSFER_DST_BIT = 0x00000010;
+		public static XrSwapchainUsageFlags XR_SWAPCHAIN_USAGE_SAMPLED_BIT = 0x00000020;
+		public static XrSwapchainUsageFlags XR_SWAPCHAIN_USAGE_MUTABLE_FORMAT_BIT = 0x00000040;
+		public static XrSwapchainUsageFlags XR_SWAPCHAIN_USAGE_INPUT_ATTACHMENT_BIT_MND = 0x00000080;
+		public static XrSwapchainUsageFlags XR_SWAPCHAIN_USAGE_INPUT_ATTACHMENT_BIT_KHR = 0x00000080;
+	}
+}

Packages/com.htc.upm.vive.openxr/Runtime/Features/CompositionLayer/Scripts/ViveCompositionLayerHelper.cs.meta

@@ -0,0 +1,11 @@
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+  serializedVersion: 2
+  defaultReferences: []
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Packages/com.htc.upm.vive.openxr/Runtime/Features/CompositionLayer/Scripts/ViveCompositionLayerPassthrough.cs

@@ -0,0 +1,943 @@
+// Copyright HTC Corporation All Rights Reserved.
+
+using System.Collections.Generic;
+using UnityEditor;
+using UnityEngine.XR.OpenXR;
+using UnityEngine.XR.OpenXR.Features;
+using AOT;
+using UnityEngine;
+using System;
+using System.Runtime.InteropServices;
+using System.Linq;
+using UnityEngine.XR;
+
+#if UNITY_EDITOR
+using UnityEditor.XR.OpenXR.Features;
+#endif
+
+namespace VIVE.OpenXR.CompositionLayer.Passthrough
+{
+#if UNITY_EDITOR
+	[OpenXRFeature(UiName = "VIVE XR Composition Layer (Passthrough) (Deprecated)",
+		Desc = "Enable this feature to use the HTC Passthrough feature.",
+		Company = "HTC",
+		DocumentationLink = "..\\Documentation",
+		OpenxrExtensionStrings = kOpenxrExtensionStrings,
+		Version = "1.0.0",
+		BuildTargetGroups = new[] { BuildTargetGroup.Android ,BuildTargetGroup.Standalone},
+		FeatureId = featureId
+	)]
+#endif
+	[Obsolete("This class is deprecated. Please use VivePassthrough instead.")]
+	public class ViveCompositionLayerPassthrough : OpenXRFeature
+	{
+		const string LOG_TAG = "VIVE.OpenXR.ViveCompositionLayerPassthrough";
+		static void DEBUG(string msg) { Debug.Log(LOG_TAG + " " + msg); }
+		static void WARNING(string msg) { Debug.LogWarning(LOG_TAG + " " + msg); }
+		static void ERROR(string msg) { Debug.LogError(LOG_TAG + " " + msg); }
+
+		private List<int> passthroughIDList = new List<int>();
+		/// <summary>
+		/// The List of passthrough ID.
+		/// </summary>
+		public List<int> PassthroughIDList { get{ return new List<int>(passthroughIDList); } }
+
+		private List<XRInputSubsystem> inputSubsystems = new List<XRInputSubsystem>();
+
+		/// <summary>
+		/// The feature id string. This is used to give the feature a well known id for reference.
+		/// </summary>
+		public const string featureId = "vive.openxr.feature.compositionlayer.passthrough";
+
+		/// <summary>
+		/// The extension string.
+		/// </summary>
+		public const string kOpenxrExtensionStrings = "XR_HTC_passthrough";
+
+		private bool m_HTCPassthroughExtensionEnabled = true;
+		/// <summary>
+		/// The HTC Passthrough extension is enabled or not.
+		/// </summary>
+		public bool HTCPassthroughExtensionEnabled
+		{
+			get { return m_HTCPassthroughExtensionEnabled; }
+		}
+
+		#region OpenXR Life Cycle
+		private bool m_XrInstanceCreated = false;
+		/// <summary>
+		/// The XR instance is created or not.
+		/// </summary>
+		public bool XrInstanceCreated
+		{
+			get { return m_XrInstanceCreated; }
+		}
+#if UNITY_STANDALONE
+		private static IntPtr xrGetInstanceProcAddr_prev;
+		private static IntPtr XrEndFrame_prev;
+		private static IntPtr XrWaitFrame_prev;
+		private static List<IntPtr> layerListOrigin = new List<IntPtr>();
+		private static List<IntPtr> layerListModified = new List<IntPtr>();
+		private static IntPtr layersModified = Marshal.AllocHGlobal((int)(Marshal.SizeOf(typeof(IntPtr)) * 30)); //Preallocate a layer buffer with sufficient size and reuse it for each frame.
+		protected override IntPtr HookGetInstanceProcAddr(IntPtr func)
+		{
+			UnityEngine.Debug.Log("EXT: registering our own xrGetInstanceProcAddr");
+			xrGetInstanceProcAddr_prev = func;
+			return Marshal.GetFunctionPointerForDelegate(Intercept_xrGetInstanceProcAddr);
+		}
+		[MonoPInvokeCallback(typeof(OpenXRHelper.xrGetInstanceProcAddrDelegate))]
+		private static XrResult InterceptXrEndFrame_xrGetInstanceProcAddr(XrInstance instance, string name, out IntPtr function)
+		{
+			if (xrGetInstanceProcAddr_prev == null || xrGetInstanceProcAddr_prev == IntPtr.Zero)
+			{
+				UnityEngine.Debug.LogError("xrGetInstanceProcAddr_prev is null");
+				function = IntPtr.Zero;
+				return XrResult.XR_ERROR_VALIDATION_FAILURE;
+			}
+
+			// Get delegate of old xrGetInstanceProcAddr.
+			var xrGetProc = Marshal.GetDelegateForFunctionPointer<OpenXRHelper.xrGetInstanceProcAddrDelegate>(xrGetInstanceProcAddr_prev);
+			XrResult result = xrGetProc(instance, name, out function);
+			if (name == "xrEndFrame")
+			{
+				XrEndFrame_prev = function;
+				m_intercept_xrEndFrame = intercepted_xrEndFrame;
+				function = Marshal.GetFunctionPointerForDelegate(m_intercept_xrEndFrame); ;
+				UnityEngine.Debug.Log("Getting xrEndFrame func");
+			}
+			if (name == "xrWaitFrame")
+			{
+				XrWaitFrame_prev = function;
+				m_intercept_xrWaitFrame = intercepted_xrWaitFrame;
+				function = Marshal.GetFunctionPointerForDelegate(m_intercept_xrWaitFrame); ;
+				UnityEngine.Debug.Log("Getting xrWaitFrame func");
+			}
+			return result;
+		}
+
+		[MonoPInvokeCallback(typeof(OpenXRHelper.xrEndFrameDelegate))]
+		private static XrResult intercepted_xrEndFrame(XrSession session, ref XrFrameEndInfo frameEndInfo)
+		{
+			XrResult res;
+			// Get delegate of prev xrEndFrame.
+			var xrEndFrame = Marshal.GetDelegateForFunctionPointer<OpenXRHelper.xrEndFrameDelegate>(XrEndFrame_prev);
+
+			layerListOrigin.Clear();
+			uint layerCount = frameEndInfo.layerCount;
+			IntPtr layers = frameEndInfo.layers;
+			for (int i = 0; i < layerCount; i++)
+			{
+				IntPtr ptr = Marshal.ReadIntPtr(layers, i * Marshal.SizeOf(typeof(IntPtr)));
+				XrCompositionLayerBaseHeader header = (XrCompositionLayerBaseHeader)Marshal.PtrToStructure(ptr, typeof(XrCompositionLayerBaseHeader));
+				layerListOrigin.Add(ptr);
+			}
+			List<IntPtr> layerListNew;
+			if (layerListModified.Count != 0)
+			{
+				layerListNew = new List<IntPtr>(layerListModified);
+			}
+			else
+			{
+				layerListNew = new List<IntPtr>(layerListOrigin);
+			}
+			for (int i = 0; i < layerListNew.Count; i++)
+			{
+				Marshal.WriteIntPtr(layersModified, i * Marshal.SizeOf(typeof(IntPtr)), layerListNew[i]);
+			}
+			frameEndInfo.layers = layersModified;
+			frameEndInfo.layerCount = (uint)layerListNew.Count;
+
+			res = xrEndFrame(session, ref frameEndInfo);
+			return res;
+		}
+		private static XrFrameWaitInfo m_frameWaitInfo;
+		private static XrFrameState m_frameState;
+		[MonoPInvokeCallback(typeof(OpenXRHelper.xrWaitFrameDelegate))]
+		private static int intercepted_xrWaitFrame(ulong session, ref XrFrameWaitInfo frameWaitInfo, ref XrFrameState frameState)
+		{
+			var xrWaitFrame = Marshal.GetDelegateForFunctionPointer<OpenXRHelper.xrWaitFrameDelegate>(XrWaitFrame_prev);
+			int res = xrWaitFrame(session, ref frameWaitInfo, ref frameState);
+			m_frameWaitInfo = frameWaitInfo;
+			m_frameState = frameState;
+			return res;
+		}
+		public void GetOriginEndFrameLayerList(out List<IntPtr> layers)
+		{
+			layers = new List<IntPtr>(layerListOrigin);
+		}
+
+		public void SubmitLayers(List<IntPtr> layers)
+		{
+			layerListModified = new List<IntPtr>(layers);
+			//UnityEngine.Debug.Log("####Update submit end " + layerListModified.Count);
+		}
+		public XrFrameState GetFrameState()
+		{
+			return m_frameState;
+		}
+#endif
+
+		private XrInstance m_XrInstance = 0;
+		protected override bool OnInstanceCreate(ulong xrInstance)
+		{
+			foreach (string kOpenxrExtensionString in kOpenxrExtensionStrings.Split(' '))
+			{
+				if (!OpenXRRuntime.IsExtensionEnabled(kOpenxrExtensionString))
+				{
+					WARNING("OnInstanceCreate() " + kOpenxrExtensionString + " is NOT enabled.");
+
+					m_HTCPassthroughExtensionEnabled = false;
+					return false;
+				}
+			}
+
+			m_XrInstanceCreated = true;
+			m_XrInstance = xrInstance;
+			DEBUG("OnInstanceCreate() " + m_XrInstance);
+
+			return GetXrFunctionDelegates(m_XrInstance);
+		}
+
+		protected override void OnInstanceDestroy(ulong xrInstance)
+		{
+			m_XrInstanceCreated = false;
+			DEBUG("OnInstanceDestroy() " + m_XrInstance);
+		}
+
+		private XrSystemId m_XrSystemId = 0;
+		protected override void OnSystemChange(ulong xrSystem)
+		{
+			m_XrSystemId = xrSystem;
+			DEBUG("OnSystemChange() " + m_XrSystemId);
+		}
+
+		private bool m_XrSessionCreated = false;
+		/// <summary>
+		/// The XR session is created or not.
+		/// </summary>
+		public bool XrSessionCreated
+		{
+			get { return m_XrSessionCreated; }
+		}
+		private XrSession m_XrSession = 0;
+		protected override void OnSessionCreate(ulong xrSession)
+		{
+			m_XrSession = xrSession;
+			m_XrSessionCreated = true;
+			DEBUG("OnSessionCreate() " + m_XrSession);
+		}
+
+		private bool m_XrSessionEnding = false;
+		/// <summary>
+		/// The XR session is ending or not.
+		/// </summary>
+		public bool XrSessionEnding
+		{
+			get { return m_XrSessionEnding; }
+		}
+
+		private XrSpace m_WorldLockSpaceOriginOnHead = 0, m_WorldLockSpaceOriginOnFloor = 0, m_HeadLockSpace = 0;
+		private XrSpace WorldLockSpaceOriginOnHead
+		{
+			get { return m_WorldLockSpaceOriginOnHead; }
+		}
+		private XrSpace WorldLockSpaceOriginOnFloor
+		{
+			get { return m_WorldLockSpaceOriginOnFloor; }
+		}
+		private XrSpace HeadLockSpace
+		{
+			get { return m_HeadLockSpace; }
+		}
+
+		protected override void OnSessionBegin(ulong xrSession)
+		{
+			m_XrSessionEnding = false;
+			DEBUG("OnSessionBegin() " + m_XrSession);
+
+			// Enumerate supported reference space types and create the XrSpace.
+			XrReferenceSpaceType[] spaces = new XrReferenceSpaceType[Enum.GetNames(typeof(XrReferenceSpaceType)).Count()];
+			UInt32 spaceCountOutput;
+			if (EnumerateReferenceSpaces(
+				spaceCapacityInput: 0,
+				spaceCountOutput: out spaceCountOutput,
+				spaces: out spaces[0]) == XrResult.XR_SUCCESS)
+			{
+				//DEBUG("spaceCountOutput: " + spaceCountOutput);
+
+				Array.Resize(ref spaces, (int)spaceCountOutput);
+				if (EnumerateReferenceSpaces(
+					spaceCapacityInput: spaceCountOutput,
+					spaceCountOutput: out spaceCountOutput,
+					spaces: out spaces[0]) == XrResult.XR_SUCCESS)
+				{
+					if (spaces.Contains(XrReferenceSpaceType.XR_REFERENCE_SPACE_TYPE_LOCAL))
+					{
+						XrReferenceSpaceCreateInfo referenceSpaceCreateInfoWorldLock;
+						referenceSpaceCreateInfoWorldLock.type = XrStructureType.XR_TYPE_REFERENCE_SPACE_CREATE_INFO;
+						referenceSpaceCreateInfoWorldLock.next = IntPtr.Zero;
+						referenceSpaceCreateInfoWorldLock.referenceSpaceType = XrReferenceSpaceType.XR_REFERENCE_SPACE_TYPE_LOCAL;
+						referenceSpaceCreateInfoWorldLock.poseInReferenceSpace.orientation = new XrQuaternionf(0, 0, 0, 1);
+						referenceSpaceCreateInfoWorldLock.poseInReferenceSpace.position = new XrVector3f(0, 0, 0);
+
+						if (CreateReferenceSpace(
+						createInfo: ref referenceSpaceCreateInfoWorldLock,
+						space: out m_WorldLockSpaceOriginOnHead) == XrResult.XR_SUCCESS)
+						{
+							//DEBUG("CreateReferenceSpace: " + m_WorldLockSpaceOriginOnHead);
+						}
+						else
+						{
+							ERROR("CreateReferenceSpace for world lock layers on head failed.");
+						}
+					}
+					else
+					{
+						ERROR("CreateReferenceSpace no space type for world lock on head layers.");
+					}
+
+					if (spaces.Contains(XrReferenceSpaceType.XR_REFERENCE_SPACE_TYPE_STAGE))
+					{
+						XrReferenceSpaceCreateInfo referenceSpaceCreateInfoWorldLock;
+						referenceSpaceCreateInfoWorldLock.type = XrStructureType.XR_TYPE_REFERENCE_SPACE_CREATE_INFO;
+						referenceSpaceCreateInfoWorldLock.next = IntPtr.Zero;
+						referenceSpaceCreateInfoWorldLock.referenceSpaceType = XrReferenceSpaceType.XR_REFERENCE_SPACE_TYPE_STAGE;
+						referenceSpaceCreateInfoWorldLock.poseInReferenceSpace.orientation = new XrQuaternionf(0, 0, 0, 1);
+						referenceSpaceCreateInfoWorldLock.poseInReferenceSpace.position = new XrVector3f(0, 0, 0);
+
+						if (CreateReferenceSpace(
+						createInfo: ref referenceSpaceCreateInfoWorldLock,
+						space: out m_WorldLockSpaceOriginOnFloor) == XrResult.XR_SUCCESS)
+						{
+							//DEBUG("CreateReferenceSpace: " + m_WorldLockSpaceOriginOnFloor);
+						}
+						else
+						{
+							ERROR("CreateReferenceSpace for world lock layers on floor failed.");
+						}
+					}
+					else
+					{
+						ERROR("CreateReferenceSpace no space type for world lock on floor layers.");
+					}
+
+					if (spaces.Contains(XrReferenceSpaceType.XR_REFERENCE_SPACE_TYPE_VIEW))
+					{
+						XrReferenceSpaceCreateInfo referenceSpaceCreateInfoHeadLock;
+						referenceSpaceCreateInfoHeadLock.type = XrStructureType.XR_TYPE_REFERENCE_SPACE_CREATE_INFO;
+						referenceSpaceCreateInfoHeadLock.next = IntPtr.Zero;
+						referenceSpaceCreateInfoHeadLock.referenceSpaceType = XrReferenceSpaceType.XR_REFERENCE_SPACE_TYPE_VIEW;
+						referenceSpaceCreateInfoHeadLock.poseInReferenceSpace.orientation = new XrQuaternionf(0, 0, 0, 1);
+						referenceSpaceCreateInfoHeadLock.poseInReferenceSpace.position = new XrVector3f(0, 0, 0);
+
+						if (CreateReferenceSpace(
+						createInfo: ref referenceSpaceCreateInfoHeadLock,
+						space: out m_HeadLockSpace) == XrResult.XR_SUCCESS)
+						{
+							//DEBUG("CreateReferenceSpace: " + m_HeadLockSpace);
+						}
+						else
+						{
+							ERROR("CreateReferenceSpace for head lock layers failed.");
+						}
+					}
+					else
+					{
+						ERROR("CreateReferenceSpace no space type for head lock layers.");
+					}
+				}
+				else
+				{
+					ERROR("EnumerateReferenceSpaces(" + spaceCountOutput + ") failed.");
+				}
+			}
+			else
+			{
+				ERROR("EnumerateReferenceSpaces(0) failed.");
+			}
+		}
+
+		protected override void OnSessionEnd(ulong xrSession)
+		{
+			m_XrSessionEnding = true;
+			DEBUG("OnSessionEnd() " + m_XrSession);
+		}
+
+		/// <summary>
+		/// The delegate of Passthrough Session Destroy.
+		/// </summary>
+		public delegate void OnPassthroughSessionDestroyDelegate(int passthroughID);
+		private Dictionary<int, OnPassthroughSessionDestroyDelegate> OnPassthroughSessionDestroyHandlerDictionary = new Dictionary<int, OnPassthroughSessionDestroyDelegate>();
+		protected override void OnSessionDestroy(ulong xrSession)
+		{
+			m_XrSessionCreated = false;
+			DEBUG("OnSessionDestroy() " + xrSession);
+#if UNITY_ANDROID
+			//Notify that all passthrough layers should be destroyed
+			List<int> currentPassthroughIDs = PassthroughIDList;
+			foreach (int passthroughID in currentPassthroughIDs)
+			{
+				OnPassthroughSessionDestroyDelegate OnPassthroughSessionDestroyHandler = OnPassthroughSessionDestroyHandlerDictionary[passthroughID];
+
+				OnPassthroughSessionDestroyHandler?.Invoke(passthroughID);
+			}
+#endif
+#if UNITY_STANDALONE
+			//Notify that all passthrough layers should be destroyed
+			List<XrPassthroughHTC> currentPassthroughs = PassthroughList;
+			foreach (XrPassthroughHTC passthrough in currentPassthroughs)
+			{
+				DestroyPassthroughHTC(passthrough);
+			}
+#endif
+			if (m_HeadLockSpace != 0)
+			{
+				DestroySpace(m_HeadLockSpace);
+				m_HeadLockSpace = 0;
+			}
+			if (m_WorldLockSpaceOriginOnFloor != 0)
+			{
+				DestroySpace(m_WorldLockSpaceOriginOnFloor);
+				m_WorldLockSpaceOriginOnFloor = 0;
+			}
+			if (m_WorldLockSpaceOriginOnHead != 0)
+			{
+				DestroySpace(m_WorldLockSpaceOriginOnHead);
+				m_WorldLockSpaceOriginOnHead = 0;
+			}
+		}
+
+		/// <summary>
+		/// The current XR session state.
+		/// </summary>
+		public XrSessionState XrSessionCurrentState
+		{
+			get { return m_XrSessionNewState; }
+		}
+		private XrSessionState m_XrSessionNewState = XrSessionState.XR_SESSION_STATE_UNKNOWN;
+		private XrSessionState m_XrSessionOldState = XrSessionState.XR_SESSION_STATE_UNKNOWN;
+		protected override void OnSessionStateChange(int oldState, int newState)
+		{
+			DEBUG("OnSessionStateChange() oldState: " + oldState + " newState:" + newState);
+
+			if (Enum.IsDefined(typeof(XrSessionState), oldState))
+			{
+				m_XrSessionOldState = (XrSessionState)oldState;
+			}
+			else
+			{
+				DEBUG("OnSessionStateChange() oldState undefined");
+			}
+
+			if (Enum.IsDefined(typeof(XrSessionState), newState)) 
+			{
+				m_XrSessionNewState = (XrSessionState)newState;
+			}
+			else
+			{
+				DEBUG("OnSessionStateChange() newState undefined");
+			}
+			
+		}
+#endregion
+
+#region OpenXR function delegates
+		/// xrGetInstanceProcAddr
+		OpenXRHelper.xrGetInstanceProcAddrDelegate XrGetInstanceProcAddr;
+#if UNITY_STANDALONE
+		OpenXRHelper.xrGetInstanceProcAddrDelegate Intercept_xrGetInstanceProcAddr =
+			new OpenXRHelper.xrGetInstanceProcAddrDelegate(InterceptXrEndFrame_xrGetInstanceProcAddr);
+#endif
+		private static OpenXRHelper.xrEndFrameDelegate m_intercept_xrEndFrame;
+		private static OpenXRHelper.xrWaitFrameDelegate m_intercept_xrWaitFrame;
+		/// xrGetSystemProperties
+		OpenXRHelper.xrGetSystemPropertiesDelegate xrGetSystemProperties;
+		/// <summary>
+		/// Helper function to get this feature' properties.
+		/// See <see href="https://registry.khronos.org/OpenXR/specs/1.0/html/xrspec.html#xrGetSystemProperties">xrGetSystemProperties</see>
+		/// </summary>
+		public XrResult GetSystemProperties(ref XrSystemProperties properties)
+		{
+			if (m_XrInstanceCreated)
+			{
+				return xrGetSystemProperties(m_XrInstance, m_XrSystemId, ref properties);
+			}
+
+			return XrResult.XR_ERROR_INSTANCE_LOST;
+		}
+
+		/// xrEnumerateReferenceSpaces
+		OpenXRHelper.xrEnumerateReferenceSpacesDelegate xrEnumerateReferenceSpaces;
+		public XrResult EnumerateReferenceSpaces(UInt32 spaceCapacityInput, out UInt32 spaceCountOutput, out XrReferenceSpaceType spaces)
+		{
+			if (!m_XrSessionCreated)
+			{
+				spaceCountOutput = 0;
+				spaces = XrReferenceSpaceType.XR_REFERENCE_SPACE_TYPE_UNBOUNDED_MSFT;
+				return XrResult.XR_ERROR_SESSION_NOT_RUNNING;
+			}
+
+			return xrEnumerateReferenceSpaces(m_XrSession, spaceCapacityInput, out spaceCountOutput, out spaces);
+		}
+
+		/// xrCreateReferenceSpace
+		OpenXRHelper.xrCreateReferenceSpaceDelegate xrCreateReferenceSpace;
+		/// <summary>
+		/// Creates a reference space
+		/// See <see href="https://registry.khronos.org/OpenXR/specs/1.0/man/html/xrCreateReferenceSpace.html">xrCreateReferenceSpace</see>
+		/// </summary>
+		public XrResult CreateReferenceSpace(ref XrReferenceSpaceCreateInfo createInfo, out XrSpace space)
+		{
+			if (!m_XrSessionCreated)
+			{
+				space = 0;
+				return XrResult.XR_ERROR_SESSION_NOT_RUNNING;
+			}
+
+			return xrCreateReferenceSpace(m_XrSession, ref createInfo, out space);
+		}
+
+		/// xrDestroySpace
+		OpenXRHelper.xrDestroySpaceDelegate xrDestroySpace;
+		private XrResult DestroySpace(XrSpace space)
+		{
+			if (space != 0)
+			{
+				return xrDestroySpace(space);
+			}
+			return XrResult.XR_ERROR_REFERENCE_SPACE_UNSUPPORTED;
+		}
+#if UNITY_STANDALONE
+		private List<XrPassthroughHTC> passthroughList = new List<XrPassthroughHTC>();
+		public List<XrPassthroughHTC> PassthroughList { get { return new List<XrPassthroughHTC>(passthroughList); } }
+		ViveCompositionLayerHelper.xrCreatePassthroughHTCDelegate xrCreatePassthroughHTC;
+		public XrResult CreatePassthroughHTC(XrPassthroughCreateInfoHTC createInfo, out XrPassthroughHTC passthrough)
+		{
+			if (!m_XrSessionCreated)
+			{
+				ERROR("CreatePassthroughHTC() XR_ERROR_SESSION_LOST.");
+				passthrough = 0;
+				return XrResult.XR_ERROR_SESSION_LOST;
+			}
+			if (!m_XrInstanceCreated)
+			{
+				ERROR("CreatePassthroughHTC() XR_ERROR_INSTANCE_LOST.");
+				passthrough = 0;
+				return XrResult.XR_ERROR_INSTANCE_LOST;
+			}
+
+			XrResult res = xrCreatePassthroughHTC(m_XrSession, createInfo, out passthrough);
+			if (res == XrResult.XR_SUCCESS)
+            {
+				passthroughList.Add(passthrough);
+				passthroughIDList.Add(((int)(ulong)passthrough));
+			}
+			else
+				ERROR("CreatePassthroughHTC() "+res);
+			return res;
+		}
+
+		ViveCompositionLayerHelper.xrDestroyPassthroughHTCDelegate xrDestroyPassthroughHTC;
+		public XrResult DestroyPassthroughHTC(XrPassthroughHTC passthrough)
+		{
+			DEBUG("Entry");
+			XrResult res = xrDestroyPassthroughHTC(passthrough);
+			if (res == XrResult.XR_SUCCESS)
+			{
+				passthroughList.Remove(passthrough);
+				passthroughIDList.Remove(((int)(ulong)passthrough));
+			}
+			return res;
+		}
+		/// <summary>
+		/// According to XRInputSubsystem's tracking origin mode, return the corresponding XrSpace.
+		/// </summary>
+		/// <returns></returns>
+		public XrSpace GetTrackingSpace()
+		{
+			var s = GetCurrentAppSpace();
+			Debug.Log("VivePassthrough GetTrackingSpace() s=" + s);
+			return s;
+		}
+#endif
+		private bool GetXrFunctionDelegates(XrInstance xrInstance)
+        {
+            /// xrGetInstanceProcAddr
+            if (xrGetInstanceProcAddr != null && xrGetInstanceProcAddr != IntPtr.Zero)
+            {
+                DEBUG("Get function pointer of xrGetInstanceProcAddr.");
+                XrGetInstanceProcAddr = Marshal.GetDelegateForFunctionPointer(
+                    xrGetInstanceProcAddr,
+                    typeof(OpenXRHelper.xrGetInstanceProcAddrDelegate)) as OpenXRHelper.xrGetInstanceProcAddrDelegate;
+            }
+            else
+            {
+                ERROR("xrGetInstanceProcAddr");
+                return false;
+            }
+
+            IntPtr funcPtr = IntPtr.Zero;
+            /// xrGetSystemProperties
+            if (XrGetInstanceProcAddr(xrInstance, "xrGetSystemProperties", out funcPtr) == XrResult.XR_SUCCESS)
+            {
+                if (funcPtr != IntPtr.Zero)
+                {
+                    DEBUG("Get function pointer of xrGetSystemProperties.");
+                    xrGetSystemProperties = Marshal.GetDelegateForFunctionPointer(
+                        funcPtr,
+                        typeof(OpenXRHelper.xrGetSystemPropertiesDelegate)) as OpenXRHelper.xrGetSystemPropertiesDelegate;
+                }
+            }
+            else
+            {
+                ERROR("xrGetSystemProperties");
+                return false;
+            }
+			/// xrEnumerateReferenceSpaces
+			if (XrGetInstanceProcAddr(xrInstance, "xrEnumerateReferenceSpaces", out funcPtr) == XrResult.XR_SUCCESS)
+			{
+				if (funcPtr != IntPtr.Zero)
+				{
+					DEBUG("Get function pointer of xrEnumerateReferenceSpaces.");
+					xrEnumerateReferenceSpaces = Marshal.GetDelegateForFunctionPointer(
+						funcPtr,
+						typeof(OpenXRHelper.xrEnumerateReferenceSpacesDelegate)) as OpenXRHelper.xrEnumerateReferenceSpacesDelegate;
+				}
+			}
+			else
+			{
+				ERROR("xrEnumerateReferenceSpaces");
+				return false;
+			}
+			/// xrCreateReferenceSpace
+			if (XrGetInstanceProcAddr(xrInstance, "xrCreateReferenceSpace", out funcPtr) == XrResult.XR_SUCCESS)
+			{
+				if (funcPtr != IntPtr.Zero)
+				{
+					DEBUG("Get function pointer of xrCreateReferenceSpace.");
+					xrCreateReferenceSpace = Marshal.GetDelegateForFunctionPointer(
+						funcPtr,
+						typeof(OpenXRHelper.xrCreateReferenceSpaceDelegate)) as OpenXRHelper.xrCreateReferenceSpaceDelegate;
+				}
+			}
+			else
+			{
+				ERROR("xrCreateReferenceSpace");
+				return false;
+			}
+			/// xrDestroySpace
+			if (XrGetInstanceProcAddr(xrInstance, "xrDestroySpace", out funcPtr) == XrResult.XR_SUCCESS)
+			{
+				if (funcPtr != IntPtr.Zero)
+				{
+					DEBUG("Get function pointer of xrDestroySpace.");
+					xrDestroySpace = Marshal.GetDelegateForFunctionPointer(
+						funcPtr,
+						typeof(OpenXRHelper.xrDestroySpaceDelegate)) as OpenXRHelper.xrDestroySpaceDelegate;
+				}
+			}
+			else
+			{
+				ERROR("xrDestroySpace");
+				return false;
+			}
+#if UNITY_STANDALONE
+			/// xrCreatePassthroughHTC
+			if (XrGetInstanceProcAddr(xrInstance, "xrCreatePassthroughHTC", out funcPtr) == XrResult.XR_SUCCESS)
+			{
+				if (funcPtr != IntPtr.Zero)
+				{
+					DEBUG("Get function pointer of xrCreatePassthroughHTC.");
+					xrCreatePassthroughHTC = Marshal.GetDelegateForFunctionPointer(
+						funcPtr,
+						typeof(ViveCompositionLayerHelper.xrCreatePassthroughHTCDelegate)) as ViveCompositionLayerHelper.xrCreatePassthroughHTCDelegate;
+				}
+			}
+			else
+			{
+				ERROR("xrCreatePassthroughHTC");
+				return false;
+			}
+			/// xrCreatePassthroughHTC
+			if (XrGetInstanceProcAddr(xrInstance, "xrDestroyPassthroughHTC", out funcPtr) == XrResult.XR_SUCCESS)
+			{
+				if (funcPtr != IntPtr.Zero)
+				{
+					DEBUG("Get function pointer of xrDestroyPassthroughHTC.");
+					xrDestroyPassthroughHTC = Marshal.GetDelegateForFunctionPointer(
+						funcPtr,
+						typeof(ViveCompositionLayerHelper.xrDestroyPassthroughHTCDelegate)) as ViveCompositionLayerHelper.xrDestroyPassthroughHTCDelegate;
+				}
+			}
+			else
+			{
+				ERROR("xrDestroyPassthroughHTC");
+				return false;
+			}
+#endif
+#if UNITY_ANDROID
+			if (HTCPassthrough_GetFuncAddrs(xrInstance, xrGetInstanceProcAddr) == XrResult.XR_SUCCESS)
+			{
+				DEBUG("Get function pointers in native.");
+			}
+			else
+			{
+				ERROR("HTCPassthrough_GetFuncAddrs");
+				return false;
+			}
+#endif
+			return true;
+        }
+#endregion
+
+#region Wrapper Functions
+		private const string ExtLib = "viveopenxr";
+		[DllImportAttribute(ExtLib, EntryPoint = "htcpassthrough_CreatePassthrough")]
+		private static extern int VIVEOpenXR_HTCPassthrough_CreatePassthrough(XrSession session, LayerType layerType, PassthroughLayerForm layerForm, uint compositionDepth = 0);
+		/// <summary>
+		/// Create Passthrough.
+		/// </summary>
+		public int HTCPassthrough_CreatePassthrough(LayerType layerType, PassthroughLayerForm layerForm, OnPassthroughSessionDestroyDelegate onDestroyPassthroughHandler, uint compositionDepth = 0)
+		{
+			if (!m_XrSessionCreated || m_XrSession == 0)
+			{
+				ERROR("Xr Session not found");
+				return 0;
+			}
+
+			if (!HTCPassthroughExtensionEnabled)
+			{
+				ERROR("HTCPassthrough_CreatePassthrough: " + kOpenxrExtensionStrings + " is NOT enabled.");
+				return 0;
+			}
+
+			int passthroughID = VIVEOpenXR_HTCPassthrough_CreatePassthrough(m_XrSession, layerType, layerForm, compositionDepth);
+
+			if (passthroughID != 0)
+			{
+				passthroughIDList.Add(passthroughID);
+				OnPassthroughSessionDestroyHandlerDictionary.Add(passthroughID, onDestroyPassthroughHandler);
+			}
+
+			return passthroughID;
+		}
+
+		[DllImportAttribute(ExtLib, EntryPoint = "htcpassthrough_SetAlpha")]
+		private static extern bool VIVEOpenXR_HTCPassthrough_SetAlpha(int passthroughID, float alpha);
+		/// <summary>
+		/// Set Passthough Alpha.
+		/// </summary>
+		public bool HTCPassthrough_SetAlpha(int passthroughID, float alpha)
+		{
+			if (!HTCPassthroughExtensionEnabled)
+			{
+				ERROR("HTCPassthrough_SetAlpha: " + kOpenxrExtensionStrings + " is NOT enabled.");
+				return false;
+			}
+
+			return VIVEOpenXR_HTCPassthrough_SetAlpha(passthroughID, alpha);
+		}
+
+		[DllImportAttribute(ExtLib, EntryPoint = "htcpassthrough_SetLayerType")]
+		private static extern bool VIVEOpenXR_HTCPassthrough_SetLayerType(int passthroughID, LayerType layerType, uint compositionDepth = 0);
+		/// <summary>
+		/// Set Passthough Layer Type.
+		/// </summary>
+		public bool HTCPassthrough_SetLayerType(int passthroughID, LayerType layerType, uint compositionDepth = 0)
+		{
+			if (!HTCPassthroughExtensionEnabled)
+			{
+				ERROR("HTCPassthrough_SetLayerType: " + kOpenxrExtensionStrings + " is NOT enabled.");
+				return false;
+			}
+
+			return VIVEOpenXR_HTCPassthrough_SetLayerType(passthroughID, layerType, compositionDepth);
+		}
+
+		[DllImportAttribute(ExtLib, EntryPoint = "htcpassthrough_SetMesh")]
+		private static extern bool VIVEOpenXR_HTCPassthrough_SetMesh(int passthroughID, uint vertexCount, [In, Out] XrVector3f[] vertexBuffer, uint indexCount, [In, Out] uint[] indexBuffer);
+		/// <summary>
+		/// Set Passthough Mesh.
+		/// </summary>
+		public bool HTCPassthrough_SetMesh(int passthroughID, uint vertexCount, [In, Out] XrVector3f[] vertexBuffer, uint indexCount, [In, Out] uint[] indexBuffer)
+		{
+			if (!HTCPassthroughExtensionEnabled)
+			{
+				ERROR("HTCPassthrough_SetMesh: " + kOpenxrExtensionStrings + " is NOT enabled.");
+				return false;
+			}
+
+			return VIVEOpenXR_HTCPassthrough_SetMesh(passthroughID, vertexCount, vertexBuffer, indexCount, indexBuffer);
+		}
+
+		[DllImportAttribute(ExtLib, EntryPoint = "htcpassthrough_SetMeshTransform")]
+		private static extern bool VIVEOpenXR_HTCPassthrough_SetMeshTransform(int passthroughID, XrSpace meshSpace, XrPosef meshPose, XrVector3f meshScale);
+		/// <summary>
+		/// Set Passthough Mesh Transform.
+		/// </summary>
+		public bool HTCPassthrough_SetMeshTransform(int passthroughID, XrSpace meshSpace, XrPosef meshPose, XrVector3f meshScale)
+		{
+			if (!HTCPassthroughExtensionEnabled)
+			{
+				ERROR("HTCPassthrough_SetMeshTransform: " + kOpenxrExtensionStrings + " is NOT enabled.");
+				return false;
+			}
+
+			return VIVEOpenXR_HTCPassthrough_SetMeshTransform(passthroughID, meshSpace, meshPose, meshScale);
+		}
+
+		[DllImportAttribute(ExtLib, EntryPoint = "htcpassthrough_SetMeshTransformSpace")]
+		private static extern bool VIVEOpenXR_HTCPassthrough_SetMeshTransformSpace(int passthroughID, XrSpace meshSpace);
+		/// <summary>
+		/// Set Passthough Mesh Transform Space.
+		/// </summary>
+		public bool HTCPassthrough_SetMeshTransformSpace(int passthroughID, XrSpace meshSpace)
+		{
+			if (!HTCPassthroughExtensionEnabled)
+			{
+				ERROR("HTCPassthrough_SetMeshTransformSpace: " + kOpenxrExtensionStrings + " is NOT enabled.");
+				return false;
+			}
+
+			return VIVEOpenXR_HTCPassthrough_SetMeshTransformSpace(passthroughID, meshSpace);
+		}
+
+		[DllImportAttribute(ExtLib, EntryPoint = "htcpassthrough_SetMeshTransformPosition")]
+		private static extern bool VIVEOpenXR_HTCPassthrough_SetMeshTransformPosition(int passthroughID, XrVector3f meshPosition);
+		/// <summary>
+		/// Set Passthough Mesh Transform Position.
+		/// </summary>
+		public bool HTCPassthrough_SetMeshTransformPosition(int passthroughID, XrVector3f meshPosition)
+		{
+			if (!HTCPassthroughExtensionEnabled)
+			{
+				ERROR("HTCPassthrough_SetMeshTransformPosition: " + kOpenxrExtensionStrings + " is NOT enabled.");
+				return false;
+			}
+
+			return VIVEOpenXR_HTCPassthrough_SetMeshTransformPosition(passthroughID, meshPosition);
+		}
+
+		[DllImportAttribute(ExtLib, EntryPoint = "htcpassthrough_SetMeshTransformOrientation")]
+		private static extern bool VIVEOpenXR_HTCPassthrough_SetMeshTransformOrientation(int passthroughID, XrQuaternionf meshOrientation);
+		/// <summary>
+		/// Set Passthough Mesh Transform orientation.
+		/// </summary>
+		public bool HTCPassthrough_SetMeshTransformOrientation(int passthroughID, XrQuaternionf meshOrientation)
+		{
+			if (!HTCPassthroughExtensionEnabled)
+			{
+				ERROR("HTCPassthrough_SetMeshTransformOrientation: " + kOpenxrExtensionStrings + " is NOT enabled.");
+				return false;
+			}
+
+			return VIVEOpenXR_HTCPassthrough_SetMeshTransformOrientation(passthroughID, meshOrientation);
+		}
+
+		[DllImportAttribute(ExtLib, EntryPoint = "htcpassthrough_SetMeshTransformScale")]
+		private static extern bool VIVEOpenXR_HTCPassthrough_SetMeshTransformScale(int passthroughID, XrVector3f meshScale);
+		/// <summary>
+		/// Set Passthough Mesh Transform scale.
+		/// </summary>
+		public bool HTCPassthrough_SetMeshTransformScale(int passthroughID, XrVector3f meshScale)
+		{
+			if (!HTCPassthroughExtensionEnabled)
+			{
+				ERROR("HTCPassthrough_SetMeshTransformScale: " + kOpenxrExtensionStrings + " is NOT enabled.");
+				return false;
+			}
+
+			return VIVEOpenXR_HTCPassthrough_SetMeshTransformScale(passthroughID, meshScale);
+		}
+
+		[DllImportAttribute(ExtLib, EntryPoint = "htcpassthrough_DestroyPassthrough")]
+		private static extern bool VIVEOpenXR_HTCPassthrough_DestroyPassthrough(int passthroughID);
+		/// <summary>
+		/// Destroy Passthough.
+		/// </summary>
+		public bool HTCPassthrough_DestroyPassthrough(int passthroughID)
+		{
+			if (!HTCPassthroughExtensionEnabled)
+			{
+				ERROR("HTCPassthrough_DestroyPassthrough: " + kOpenxrExtensionStrings + " is NOT enabled.");
+				return false;
+			}
+
+			bool destroyed = VIVEOpenXR_HTCPassthrough_DestroyPassthrough(passthroughID);
+
+			if (destroyed)
+			{
+				passthroughIDList.Remove(passthroughID);
+				OnPassthroughSessionDestroyHandlerDictionary.Remove(passthroughID);
+			}
+
+			return destroyed;
+		}
+#endregion
+
+#region Hook native functions
+
+		[DllImportAttribute(ExtLib, EntryPoint = "htcpassthrough_GetFuncAddrs")]
+		private static extern XrResult VIVEOpenXR_HTCPassthrough_GetFuncAddrs(XrInstance xrInstance, IntPtr xrGetInstanceProcAddrFuncPtr);
+		private XrResult HTCPassthrough_GetFuncAddrs(XrInstance xrInstance, IntPtr xrGetInstanceProcAddrFuncPtr)
+		{
+			if (!HTCPassthroughExtensionEnabled)
+			{
+				ERROR("VIVEOpenXR_HTCPassthrough_GetFuncAddrs: " + kOpenxrExtensionStrings + " is NOT enabled.");
+				return XrResult.XR_ERROR_FEATURE_UNSUPPORTED;
+			}
+
+			return VIVEOpenXR_HTCPassthrough_GetFuncAddrs(xrInstance, xrGetInstanceProcAddrFuncPtr);
+		}
+
+#endregion
+
+#region Helper Funcs
+		/// <summary>
+		/// Helper function to get XrSpace from space type.
+		/// </summary>
+		public XrSpace GetXrSpaceFromSpaceType(ProjectedPassthroughSpaceType spaceType)
+		{
+			XrSpace meshSpace = 0;
+			switch (spaceType)
+			{
+				case ProjectedPassthroughSpaceType.Headlock:
+					meshSpace = HeadLockSpace;
+					break;
+				case ProjectedPassthroughSpaceType.Worldlock:
+				default:
+					XRInputSubsystem subsystem = null;
+					SubsystemManager.GetInstances(inputSubsystems);
+					if (inputSubsystems.Count > 0)
+					{
+						subsystem = inputSubsystems[0];
+					}
+
+					if (subsystem != null)
+					{
+						TrackingOriginModeFlags trackingOriginMode = subsystem.GetTrackingOriginMode();
+
+						switch (trackingOriginMode)
+						{
+							default:
+							case TrackingOriginModeFlags.Floor:
+								meshSpace = WorldLockSpaceOriginOnFloor;
+								break;
+							case TrackingOriginModeFlags.Device:
+								meshSpace = WorldLockSpaceOriginOnHead;
+								break;
+						}
+					}
+					else
+					{
+						meshSpace = WorldLockSpaceOriginOnFloor;
+					}
+					break;
+			}
+
+			return meshSpace;
+		}
+
+#endregion
+	}
+}

Packages/com.htc.upm.vive.openxr/Runtime/Features/CompositionLayer/Scripts/ViveCompositionLayerPassthrough.cs.meta

@@ -0,0 +1,11 @@
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+guid: 0e78888b9743d564482402fe284c9126
+MonoImporter:
+  externalObjects: {}
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+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Packages/com.htc.upm.vive.openxr/Runtime/Features/CompositionLayer/Scripts/ViveCompositionLayerPassthroughHelper.cs

@@ -0,0 +1,46 @@
+// Copyright HTC Corporation All Rights Reserved.
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.InteropServices;
+
+namespace VIVE.OpenXR.CompositionLayer.Passthrough
+{
+	[Obsolete("This enumeration is deprecated. Please use XrStructureType instead.")]
+	//[StructLayout(LayoutKind.Sequential)]
+    public enum XrStructureTypeHTC
+    {
+		XR_TYPE_PASSTHROUGH_CREATE_INFO_HTC = 1000317001,
+		XR_TYPE_PASSTHROUGH_COLOR_HTC = 1000317002,
+		XR_TYPE_PASSTHROUGH_MESH_TRANSFORM_INFO_HTC = 1000317003,
+		XR_TYPE_COMPOSITION_LAYER_PASSTHROUGH_HTC = 1000317004,
+	}
+
+	[Obsolete("This enumeration is deprecated. Please use VIVE.OpenXR.Passthrough.PassthroughLayerForm instead.")]
+	public enum PassthroughLayerForm
+	{
+		///<summary> Fullscreen Passthrough Form</summary>
+		Planar = 0,
+		///<summary> Projected Passthrough Form</summary>
+		Projected = 1
+	}
+
+	[Obsolete("This enumeration is deprecated. Please use VIVE.OpenXR.Passthrough.ProjectedPassthroughSpaceType instead.")]
+	public enum ProjectedPassthroughSpaceType
+	{
+		///<summary> 
+		/// XR_REFERENCE_SPACE_TYPE_VIEW at (0,0,0) with orientation (0,0,0,1) 
+		///</summary>
+		Headlock = 0,
+		///<summary> 
+		/// When TrackingOriginMode is TrackingOriginModeFlags.Floor:
+		/// XR_REFERENCE_SPACE_TYPE_STAGE at (0,0,0) with orientation (0,0,0,1) 
+		/// 
+		/// When TrackingOriginMode is TrackingOriginModeFlags.Device:
+		/// XR_REFERENCE_SPACE_TYPE_LOCAL at (0,0,0) with orientation (0,0,0,1) 
+		/// 
+		///</summary>
+		Worldlock = 1
+	}
+}

Packages/com.htc.upm.vive.openxr/Runtime/Features/CompositionLayer/Scripts/ViveCompositionLayerPassthroughHelper.cs.meta

@@ -0,0 +1,11 @@
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+  externalObjects: {}
+  serializedVersion: 2
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