Adding upstream version 7.0.6-dfsg.upstream/7.0.6-dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

2 files changed, 4350 insertions, 0 deletions

diff --git a/src/libs/dxvk-native-1.9.2a/include/openvr/LICENSE b/src/libs/dxvk-native-1.9.2a/include/openvr/LICENSE
new file mode 100644
index 00000000..acf1c011
--- /dev/null
+++ b/src/libs/dxvk-native-1.9.2a/include/openvr/LICENSE
@@ -0,0 +1,27 @@
+Copyright (c) 2015, Valve Corporation
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this
+list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice,
+this list of conditions and the following disclaimer in the documentation and/or
+other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its contributors
+may be used to endorse or promote products derived from this software without
+specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
\ No newline at end of file
diff --git a/src/libs/dxvk-native-1.9.2a/include/openvr/openvr.hpp b/src/libs/dxvk-native-1.9.2a/include/openvr/openvr.hpp
new file mode 100644
index 00000000..34a39088
--- /dev/null
+++ b/src/libs/dxvk-native-1.9.2a/include/openvr/openvr.hpp
@@ -0,0 +1,4323 @@
+#pragma once
+
+// openvr.h
+//========= Copyright Valve Corporation ============//
+// Dynamically generated file. Do not modify this file directly.
+
+#ifndef _OPENVR_API
+#define _OPENVR_API
+
+#include <stdint.h>
+
+
+
+// vrtypes.h
+#ifndef _INCLUDE_VRTYPES_H
+#define _INCLUDE_VRTYPES_H
+
+// Forward declarations to avoid requiring vulkan.h
+struct VkDevice_T;
+struct VkPhysicalDevice_T;
+struct VkInstance_T;
+struct VkQueue_T;
+
+// Forward declarations to avoid requiring d3d12.h
+struct ID3D12Resource;
+struct ID3D12CommandQueue;
+
+namespace vr
+{
+#pragma pack( push, 8 )
+
+typedef void* glSharedTextureHandle_t;
+typedef int32_t glInt_t;
+typedef uint32_t glUInt_t;
+
+// right-handed system
+// +y is up
+// +x is to the right
+// -z is forward
+// Distance unit is  meters
+struct HmdMatrix34_t
+{
+	float m[3][4];
+};
+
+struct HmdMatrix44_t
+{
+	float m[4][4];
+};
+
+struct HmdVector3_t
+{
+	float v[3];
+};
+
+struct HmdVector4_t
+{
+	float v[4];
+};
+
+struct HmdVector3d_t
+{
+	double v[3];
+};
+
+struct HmdVector2_t
+{
+	float v[2];
+};
+
+struct HmdQuaternion_t
+{
+	double w, x, y, z;
+};
+
+struct HmdQuaternionf_t
+{
+	float w, x, y, z;
+};
+
+struct HmdColor_t
+{
+	float r, g, b, a;
+};
+
+struct HmdQuad_t
+{
+	HmdVector3_t vCorners[ 4 ];
+};
+
+struct HmdRect2_t
+{
+	HmdVector2_t vTopLeft;
+	HmdVector2_t vBottomRight;
+};
+
+/** Used to return the post-distortion UVs for each color channel. 
+* UVs range from 0 to 1 with 0,0 in the upper left corner of the 
+* source render target. The 0,0 to 1,1 range covers a single eye. */
+struct DistortionCoordinates_t
+{
+	float rfRed[2];
+	float rfGreen[2];
+	float rfBlue[2];
+};
+
+enum EVREye
+{
+	Eye_Left = 0,
+	Eye_Right = 1
+};
+
+enum ETextureType
+{
+	TextureType_DirectX = 0, // Handle is an ID3D11Texture
+	TextureType_OpenGL = 1,  // Handle is an OpenGL texture name or an OpenGL render buffer name, depending on submit flags
+	TextureType_Vulkan = 2, // Handle is a pointer to a VRVulkanTextureData_t structure
+	TextureType_IOSurface = 3, // Handle is a macOS cross-process-sharable IOSurfaceRef
+	TextureType_DirectX12 = 4, // Handle is a pointer to a D3D12TextureData_t structure
+	TextureType_DXGISharedHandle = 5, // Handle is a HANDLE DXGI share handle, only supported for Overlay render targets. 
+									  // this texture is used directly by our renderer, so only perform atomic (copyresource or resolve) on it
+};
+
+enum EColorSpace
+{
+	ColorSpace_Auto = 0,	// Assumes 'gamma' for 8-bit per component formats, otherwise 'linear'.  This mirrors the DXGI formats which have _SRGB variants.
+	ColorSpace_Gamma = 1,	// Texture data can be displayed directly on the display without any conversion (a.k.a. display native format).
+	ColorSpace_Linear = 2,	// Same as gamma but has been converted to a linear representation using DXGI's sRGB conversion algorithm.
+};
+
+struct Texture_t
+{
+	void* handle; // See ETextureType definition above
+	ETextureType eType;
+	EColorSpace eColorSpace;
+};
+
+// Handle to a shared texture (HANDLE on Windows obtained using OpenSharedResource).
+typedef uint64_t SharedTextureHandle_t;
+#define INVALID_SHARED_TEXTURE_HANDLE	((vr::SharedTextureHandle_t)0)
+
+enum ETrackingResult
+{
+	TrackingResult_Uninitialized			= 1,
+
+	TrackingResult_Calibrating_InProgress	= 100,
+	TrackingResult_Calibrating_OutOfRange	= 101,
+
+	TrackingResult_Running_OK				= 200,
+	TrackingResult_Running_OutOfRange		= 201,
+};
+
+typedef uint32_t DriverId_t;
+static const uint32_t k_nDriverNone = 0xFFFFFFFF;
+
+static const uint32_t k_unMaxDriverDebugResponseSize = 32768;
+
+/** Used to pass device IDs to API calls */
+typedef uint32_t TrackedDeviceIndex_t;
+static const uint32_t k_unTrackedDeviceIndex_Hmd = 0;
+static const uint32_t k_unMaxTrackedDeviceCount = 64;
+static const uint32_t k_unTrackedDeviceIndexOther = 0xFFFFFFFE;
+static const uint32_t k_unTrackedDeviceIndexInvalid = 0xFFFFFFFF;
+
+/** Describes what kind of object is being tracked at a given ID */
+enum ETrackedDeviceClass
+{
+	TrackedDeviceClass_Invalid = 0,				// the ID was not valid.
+	TrackedDeviceClass_HMD = 1,					// Head-Mounted Displays
+	TrackedDeviceClass_Controller = 2,			// Tracked controllers
+	TrackedDeviceClass_GenericTracker = 3,		// Generic trackers, similar to controllers
+	TrackedDeviceClass_TrackingReference = 4,	// Camera and base stations that serve as tracking reference points
+	TrackedDeviceClass_DisplayRedirect = 5,		// Accessories that aren't necessarily tracked themselves, but may redirect video output from other tracked devices
+};
+
+
+/** Describes what specific role associated with a tracked device */
+enum ETrackedControllerRole
+{
+	TrackedControllerRole_Invalid = 0,					// Invalid value for controller type
+	TrackedControllerRole_LeftHand = 1,					// Tracked device associated with the left hand
+	TrackedControllerRole_RightHand = 2,				// Tracked device associated with the right hand
+	TrackedControllerRole_OptOut = 3,					// Tracked device is opting out of left/right hand selection
+	TrackedControllerRole_Max = 4
+};
+
+
+/** describes a single pose for a tracked object */
+struct TrackedDevicePose_t
+{
+	HmdMatrix34_t mDeviceToAbsoluteTracking;
+	HmdVector3_t vVelocity;				// velocity in tracker space in m/s
+	HmdVector3_t vAngularVelocity;		// angular velocity in radians/s (?)
+	ETrackingResult eTrackingResult;
+	bool bPoseIsValid;
+
+	// This indicates that there is a device connected for this spot in the pose array.
+	// It could go from true to false if the user unplugs the device.
+	bool bDeviceIsConnected;
+};
+
+/** Identifies which style of tracking origin the application wants to use
+* for the poses it is requesting */
+enum ETrackingUniverseOrigin
+{
+	TrackingUniverseSeated = 0,		// Poses are provided relative to the seated zero pose
+	TrackingUniverseStanding = 1,	// Poses are provided relative to the safe bounds configured by the user
+	TrackingUniverseRawAndUncalibrated = 2,	// Poses are provided in the coordinate system defined by the driver.  It has Y up and is unified for devices of the same driver. You usually don't want this one.
+};
+
+typedef uint64_t WebConsoleHandle_t;
+#define INVALID_WEB_CONSOLE_HANDLE	((vr::WebConsoleHandle_t)0)
+
+// Refers to a single container of properties
+typedef uint64_t PropertyContainerHandle_t;
+typedef uint32_t PropertyTypeTag_t;
+
+static const PropertyContainerHandle_t k_ulInvalidPropertyContainer = 0;
+static const PropertyTypeTag_t k_unInvalidPropertyTag = 0;
+
+typedef PropertyContainerHandle_t DriverHandle_t;
+static const PropertyContainerHandle_t k_ulInvalidDriverHandle = 0;
+
+// Use these tags to set/get common types as struct properties
+static const PropertyTypeTag_t k_unFloatPropertyTag = 1;
+static const PropertyTypeTag_t k_unInt32PropertyTag = 2;
+static const PropertyTypeTag_t k_unUint64PropertyTag = 3;
+static const PropertyTypeTag_t k_unBoolPropertyTag = 4;
+static const PropertyTypeTag_t k_unStringPropertyTag = 5;
+
+static const PropertyTypeTag_t k_unHmdMatrix34PropertyTag = 20;
+static const PropertyTypeTag_t k_unHmdMatrix44PropertyTag = 21;
+static const PropertyTypeTag_t k_unHmdVector3PropertyTag = 22;
+static const PropertyTypeTag_t k_unHmdVector4PropertyTag = 23;
+
+static const PropertyTypeTag_t k_unHiddenAreaPropertyTag = 30;
+static const PropertyTypeTag_t k_unPathHandleInfoTag = 31;
+static const PropertyTypeTag_t k_unActionPropertyTag = 32;
+static const PropertyTypeTag_t k_unInputValuePropertyTag = 33;
+static const PropertyTypeTag_t k_unWildcardPropertyTag = 34;
+static const PropertyTypeTag_t k_unHapticVibrationPropertyTag = 35;
+static const PropertyTypeTag_t k_unSkeletonPropertyTag = 36;
+
+static const PropertyTypeTag_t k_unOpenVRInternalReserved_Start = 1000;
+static const PropertyTypeTag_t k_unOpenVRInternalReserved_End = 10000;
+
+
+/** Each entry in this enum represents a property that can be retrieved about a
+* tracked device. Many fields are only valid for one ETrackedDeviceClass. */
+enum ETrackedDeviceProperty
+{
+	Prop_Invalid								= 0,
+
+	// general properties that apply to all device classes
+	Prop_TrackingSystemName_String				= 1000,
+	Prop_ModelNumber_String						= 1001,
+	Prop_SerialNumber_String					= 1002,
+	Prop_RenderModelName_String					= 1003,
+	Prop_WillDriftInYaw_Bool					= 1004,
+	Prop_ManufacturerName_String				= 1005,
+	Prop_TrackingFirmwareVersion_String			= 1006,
+	Prop_HardwareRevision_String				= 1007,
+	Prop_AllWirelessDongleDescriptions_String	= 1008,
+	Prop_ConnectedWirelessDongle_String			= 1009,
+	Prop_DeviceIsWireless_Bool					= 1010,
+	Prop_DeviceIsCharging_Bool					= 1011,
+	Prop_DeviceBatteryPercentage_Float			= 1012, // 0 is empty, 1 is full
+	Prop_StatusDisplayTransform_Matrix34		= 1013,
+	Prop_Firmware_UpdateAvailable_Bool			= 1014,
+	Prop_Firmware_ManualUpdate_Bool				= 1015,
+	Prop_Firmware_ManualUpdateURL_String		= 1016,
+	Prop_HardwareRevision_Uint64				= 1017,
+	Prop_FirmwareVersion_Uint64					= 1018,
+	Prop_FPGAVersion_Uint64						= 1019,
+	Prop_VRCVersion_Uint64						= 1020,
+	Prop_RadioVersion_Uint64					= 1021,
+	Prop_DongleVersion_Uint64					= 1022,
+	Prop_BlockServerShutdown_Bool				= 1023,
+	Prop_CanUnifyCoordinateSystemWithHmd_Bool	= 1024,
+	Prop_ContainsProximitySensor_Bool			= 1025,
+	Prop_DeviceProvidesBatteryStatus_Bool		= 1026,
+	Prop_DeviceCanPowerOff_Bool					= 1027,
+	Prop_Firmware_ProgrammingTarget_String		= 1028,
+	Prop_DeviceClass_Int32						= 1029,
+	Prop_HasCamera_Bool							= 1030,
+	Prop_DriverVersion_String                   = 1031,
+	Prop_Firmware_ForceUpdateRequired_Bool      = 1032,
+	Prop_ViveSystemButtonFixRequired_Bool		= 1033,
+	Prop_ParentDriver_Uint64					= 1034,
+	Prop_ResourceRoot_String					= 1035,
+	Prop_RegisteredDeviceType_String			= 1036,
+	Prop_InputProfilePath_String				= 1037, // input profile to use for this device in the input system. Will default to tracking system name if this isn't provided
+	Prop_NeverTracked_Bool						= 1038, // Used for devices that will never have a valid pose by design
+	Prop_NumCameras_Int32						= 1039,
+	Prop_CameraFrameLayout_Int32				= 1040, // EVRTrackedCameraFrameLayout value
+
+	// Properties that are unique to TrackedDeviceClass_HMD
+	Prop_ReportsTimeSinceVSync_Bool				= 2000,
+	Prop_SecondsFromVsyncToPhotons_Float		= 2001,
+	Prop_DisplayFrequency_Float					= 2002,
+	Prop_UserIpdMeters_Float					= 2003,
+	Prop_CurrentUniverseId_Uint64				= 2004, 
+	Prop_PreviousUniverseId_Uint64				= 2005, 
+	Prop_DisplayFirmwareVersion_Uint64			= 2006,
+	Prop_IsOnDesktop_Bool						= 2007,
+	Prop_DisplayMCType_Int32					= 2008,
+	Prop_DisplayMCOffset_Float					= 2009,
+	Prop_DisplayMCScale_Float					= 2010,
+	Prop_EdidVendorID_Int32						= 2011,
+	Prop_DisplayMCImageLeft_String              = 2012,
+	Prop_DisplayMCImageRight_String             = 2013,
+	Prop_DisplayGCBlackClamp_Float				= 2014,
+	Prop_EdidProductID_Int32					= 2015,
+	Prop_CameraToHeadTransform_Matrix34			= 2016,
+	Prop_DisplayGCType_Int32					= 2017,
+	Prop_DisplayGCOffset_Float					= 2018,
+	Prop_DisplayGCScale_Float					= 2019,
+	Prop_DisplayGCPrescale_Float				= 2020,
+	Prop_DisplayGCImage_String					= 2021,
+	Prop_LensCenterLeftU_Float					= 2022,
+	Prop_LensCenterLeftV_Float					= 2023,
+	Prop_LensCenterRightU_Float					= 2024,
+	Prop_LensCenterRightV_Float					= 2025,
+	Prop_UserHeadToEyeDepthMeters_Float			= 2026,
+	Prop_CameraFirmwareVersion_Uint64			= 2027,
+	Prop_CameraFirmwareDescription_String		= 2028,
+	Prop_DisplayFPGAVersion_Uint64				= 2029,
+	Prop_DisplayBootloaderVersion_Uint64		= 2030,
+	Prop_DisplayHardwareVersion_Uint64			= 2031,
+	Prop_AudioFirmwareVersion_Uint64			= 2032,
+	Prop_CameraCompatibilityMode_Int32			= 2033,
+	Prop_ScreenshotHorizontalFieldOfViewDegrees_Float = 2034,
+	Prop_ScreenshotVerticalFieldOfViewDegrees_Float = 2035,
+	Prop_DisplaySuppressed_Bool					= 2036,
+	Prop_DisplayAllowNightMode_Bool				= 2037,
+	Prop_DisplayMCImageWidth_Int32				= 2038,
+	Prop_DisplayMCImageHeight_Int32				= 2039,
+	Prop_DisplayMCImageNumChannels_Int32		= 2040,
+	Prop_DisplayMCImageData_Binary				= 2041,
+	Prop_SecondsFromPhotonsToVblank_Float		= 2042,
+	Prop_DriverDirectModeSendsVsyncEvents_Bool	= 2043,
+	Prop_DisplayDebugMode_Bool					= 2044,
+	Prop_GraphicsAdapterLuid_Uint64				= 2045,
+	Prop_DriverProvidedChaperonePath_String		= 2048,
+	Prop_ExpectedTrackingReferenceCount_Int32	= 2049, // expected number of sensors or basestations to reserve UI space for
+	Prop_ExpectedControllerCount_Int32			= 2050, // expected number of tracked controllers to reserve UI space for
+	Prop_NamedIconPathControllerLeftDeviceOff_String	= 2051, // placeholder icon for "left" controller if not yet detected/loaded
+	Prop_NamedIconPathControllerRightDeviceOff_String	= 2052, // placeholder icon for "right" controller if not yet detected/loaded
+	Prop_NamedIconPathTrackingReferenceDeviceOff_String	= 2053, // placeholder icon for sensor/base if not yet detected/loaded
+	Prop_DoNotApplyPrediction_Bool				= 2054,
+	Prop_CameraToHeadTransforms_Matrix34_Array	= 2055,
+	Prop_DistortionMeshResolution_Int32			= 2056, // custom resolution of compositor calls to IVRSystem::ComputeDistortion
+	Prop_DriverIsDrawingControllers_Bool		= 2057,
+	Prop_DriverRequestsApplicationPause_Bool	= 2058,
+	Prop_DriverRequestsReducedRendering_Bool	= 2059,
+	Prop_MinimumIpdStepMeters_Float				= 2060,
+	Prop_AudioBridgeFirmwareVersion_Uint64		= 2061,
+	Prop_ImageBridgeFirmwareVersion_Uint64		= 2062,
+	Prop_ImuToHeadTransform_Matrix34			= 2063,
+	Prop_ImuFactoryGyroBias_Vector3				= 2064,
+	Prop_ImuFactoryGyroScale_Vector3			= 2065,
+	Prop_ImuFactoryAccelerometerBias_Vector3	= 2066,
+	Prop_ImuFactoryAccelerometerScale_Vector3	= 2067,
+
+	// Properties that are unique to TrackedDeviceClass_Controller
+	Prop_AttachedDeviceId_String				= 3000,
+	Prop_SupportedButtons_Uint64				= 3001,
+	Prop_Axis0Type_Int32						= 3002, // Return value is of type EVRControllerAxisType
+	Prop_Axis1Type_Int32						= 3003, // Return value is of type EVRControllerAxisType
+	Prop_Axis2Type_Int32						= 3004, // Return value is of type EVRControllerAxisType
+	Prop_Axis3Type_Int32						= 3005, // Return value is of type EVRControllerAxisType
+	Prop_Axis4Type_Int32						= 3006, // Return value is of type EVRControllerAxisType
+	Prop_ControllerRoleHint_Int32				= 3007, // Return value is of type ETrackedControllerRole
+
+	// Properties that are unique to TrackedDeviceClass_TrackingReference
+	Prop_FieldOfViewLeftDegrees_Float			= 4000,
+	Prop_FieldOfViewRightDegrees_Float			= 4001,
+	Prop_FieldOfViewTopDegrees_Float			= 4002,
+	Prop_FieldOfViewBottomDegrees_Float			= 4003,
+	Prop_TrackingRangeMinimumMeters_Float		= 4004,
+	Prop_TrackingRangeMaximumMeters_Float		= 4005,
+	Prop_ModeLabel_String						= 4006,
+
+	// Properties that are used for user interface like icons names
+	Prop_IconPathName_String						= 5000, // DEPRECATED. Value not referenced. Now expected to be part of icon path properties.
+	Prop_NamedIconPathDeviceOff_String				= 5001, // {driver}/icons/icon_filename - PNG for static icon, or GIF for animation, 50x32 for headsets and 32x32 for others
+	Prop_NamedIconPathDeviceSearching_String		= 5002, // {driver}/icons/icon_filename - PNG for static icon, or GIF for animation, 50x32 for headsets and 32x32 for others
+	Prop_NamedIconPathDeviceSearchingAlert_String	= 5003, // {driver}/icons/icon_filename - PNG for static icon, or GIF for animation, 50x32 for headsets and 32x32 for others
+	Prop_NamedIconPathDeviceReady_String			= 5004, // {driver}/icons/icon_filename - PNG for static icon, or GIF for animation, 50x32 for headsets and 32x32 for others
+	Prop_NamedIconPathDeviceReadyAlert_String		= 5005, // {driver}/icons/icon_filename - PNG for static icon, or GIF for animation, 50x32 for headsets and 32x32 for others
+	Prop_NamedIconPathDeviceNotReady_String			= 5006, // {driver}/icons/icon_filename - PNG for static icon, or GIF for animation, 50x32 for headsets and 32x32 for others
+	Prop_NamedIconPathDeviceStandby_String			= 5007, // {driver}/icons/icon_filename - PNG for static icon, or GIF for animation, 50x32 for headsets and 32x32 for others
+	Prop_NamedIconPathDeviceAlertLow_String			= 5008, // {driver}/icons/icon_filename - PNG for static icon, or GIF for animation, 50x32 for headsets and 32x32 for others
+
+	// Properties that are used by helpers, but are opaque to applications
+	Prop_DisplayHiddenArea_Binary_Start				= 5100,
+	Prop_DisplayHiddenArea_Binary_End				= 5150,
+	Prop_ParentContainer							= 5151,
+
+	// Properties that are unique to drivers
+	Prop_UserConfigPath_String					= 6000,
+	Prop_InstallPath_String						= 6001,
+	Prop_HasDisplayComponent_Bool				= 6002,
+	Prop_HasControllerComponent_Bool			= 6003,
+	Prop_HasCameraComponent_Bool				= 6004,
+	Prop_HasDriverDirectModeComponent_Bool		= 6005,
+	Prop_HasVirtualDisplayComponent_Bool		= 6006,
+
+	// Properties that are set internally based on other information provided by drivers
+	Prop_ControllerType_String					= 7000,
+	Prop_LegacyInputProfile_String				= 7001,
+
+	// Vendors are free to expose private debug data in this reserved region
+	Prop_VendorSpecific_Reserved_Start			= 10000,
+	Prop_VendorSpecific_Reserved_End			= 10999,
+	
+	Prop_TrackedDeviceProperty_Max				= 1000000,
+};
+
+/** No string property will ever be longer than this length */
+static const uint32_t k_unMaxPropertyStringSize = 32 * 1024;
+
+/** Used to return errors that occur when reading properties. */
+enum ETrackedPropertyError
+{
+	TrackedProp_Success						= 0,
+	TrackedProp_WrongDataType				= 1,
+	TrackedProp_WrongDeviceClass			= 2,
+	TrackedProp_BufferTooSmall				= 3,
+	TrackedProp_UnknownProperty				= 4, // Driver has not set the property (and may not ever).
+	TrackedProp_InvalidDevice				= 5,
+	TrackedProp_CouldNotContactServer		= 6,
+	TrackedProp_ValueNotProvidedByDevice	= 7,
+	TrackedProp_StringExceedsMaximumLength	= 8,
+	TrackedProp_NotYetAvailable				= 9, // The property value isn't known yet, but is expected soon. Call again later.
+	TrackedProp_PermissionDenied			= 10,
+	TrackedProp_InvalidOperation			= 11,
+	TrackedProp_CannotWriteToWildcards		= 12,
+};
+
+/** Allows the application to control what part of the provided texture will be used in the
+* frame buffer. */
+struct VRTextureBounds_t
+{
+	float uMin, vMin;
+	float uMax, vMax;
+};
+
+/** Allows specifying pose used to render provided scene texture (if different from value returned by WaitGetPoses). */
+struct VRTextureWithPose_t : public Texture_t
+{
+	HmdMatrix34_t mDeviceToAbsoluteTracking; // Actual pose used to render scene textures.
+};
+
+struct VRTextureDepthInfo_t
+{
+	void* handle; // See ETextureType definition above
+	HmdMatrix44_t mProjection;
+	HmdVector2_t vRange; // 0..1
+};
+
+struct VRTextureWithDepth_t : public Texture_t
+{
+	VRTextureDepthInfo_t depth;
+};
+
+struct VRTextureWithPoseAndDepth_t : public VRTextureWithPose_t
+{
+	VRTextureDepthInfo_t depth;
+};
+
+/** Allows the application to control how scene textures are used by the compositor when calling Submit. */
+enum EVRSubmitFlags
+{
+	// Simple render path. App submits rendered left and right eye images with no lens distortion correction applied.
+	Submit_Default = 0x00,
+
+	// App submits final left and right eye images with lens distortion already applied (lens distortion makes the images appear
+	// barrel distorted with chromatic aberration correction applied). The app would have used the data returned by
+	// vr::IVRSystem::ComputeDistortion() to apply the correct distortion to the rendered images before calling Submit().
+	Submit_LensDistortionAlreadyApplied = 0x01,
+
+	// If the texture pointer passed in is actually a renderbuffer (e.g. for MSAA in OpenGL) then set this flag.
+	Submit_GlRenderBuffer = 0x02,
+
+	// Do not use
+	Submit_Reserved = 0x04,
+
+	// Set to indicate that pTexture is a pointer to a VRTextureWithPose_t.
+	// This flag can be combined with Submit_TextureWithDepth to pass a VRTextureWithPoseAndDepth_t.
+	Submit_TextureWithPose = 0x08,
+
+	// Set to indicate that pTexture is a pointer to a VRTextureWithDepth_t.
+	// This flag can be combined with Submit_TextureWithPose to pass a VRTextureWithPoseAndDepth_t.
+	Submit_TextureWithDepth = 0x10,
+};
+
+/** Data required for passing Vulkan textures to IVRCompositor::Submit.
+* Be sure to call OpenVR_Shutdown before destroying these resources. */
+struct VRVulkanTextureData_t
+{
+	uint64_t m_nImage; // VkImage
+	VkDevice_T *m_pDevice;
+	VkPhysicalDevice_T *m_pPhysicalDevice;
+	VkInstance_T *m_pInstance;
+	VkQueue_T *m_pQueue;
+	uint32_t m_nQueueFamilyIndex;
+	uint32_t m_nWidth, m_nHeight, m_nFormat, m_nSampleCount;
+};
+
+/** Data required for passing D3D12 textures to IVRCompositor::Submit.
+* Be sure to call OpenVR_Shutdown before destroying these resources. */
+struct D3D12TextureData_t
+{
+	ID3D12Resource *m_pResource;
+	ID3D12CommandQueue *m_pCommandQueue;
+	uint32_t m_nNodeMask;
+};
+
+/** Status of the overall system or tracked objects */
+enum EVRState
+{
+	VRState_Undefined = -1,
+	VRState_Off = 0,
+	VRState_Searching = 1,
+	VRState_Searching_Alert = 2,
+	VRState_Ready = 3,
+	VRState_Ready_Alert = 4,
+	VRState_NotReady = 5,
+	VRState_Standby = 6,
+	VRState_Ready_Alert_Low = 7,
+};
+
+/** The types of events that could be posted (and what the parameters mean for each event type) */
+enum EVREventType
+{
+	VREvent_None = 0,
+
+	VREvent_TrackedDeviceActivated		= 100,
+	VREvent_TrackedDeviceDeactivated	= 101,
+	VREvent_TrackedDeviceUpdated		= 102,
+	VREvent_TrackedDeviceUserInteractionStarted	= 103,
+	VREvent_TrackedDeviceUserInteractionEnded	= 104,
+	VREvent_IpdChanged					= 105,
+	VREvent_EnterStandbyMode			= 106,
+	VREvent_LeaveStandbyMode			= 107,
+	VREvent_TrackedDeviceRoleChanged	= 108,
+	VREvent_WatchdogWakeUpRequested		= 109,
+	VREvent_LensDistortionChanged		= 110,
+	VREvent_PropertyChanged				= 111,
+	VREvent_WirelessDisconnect			= 112,
+	VREvent_WirelessReconnect			= 113,
+
+	VREvent_ButtonPress					= 200, // data is controller
+	VREvent_ButtonUnpress				= 201, // data is controller
+	VREvent_ButtonTouch					= 202, // data is controller
+	VREvent_ButtonUntouch				= 203, // data is controller
+
+	VREvent_DualAnalog_Press			= 250, // data is dualAnalog
+	VREvent_DualAnalog_Unpress			= 251, // data is dualAnalog
+	VREvent_DualAnalog_Touch			= 252, // data is dualAnalog
+	VREvent_DualAnalog_Untouch			= 253, // data is dualAnalog
+	VREvent_DualAnalog_Move				= 254, // data is dualAnalog
+	VREvent_DualAnalog_ModeSwitch1		= 255, // data is dualAnalog
+	VREvent_DualAnalog_ModeSwitch2		= 256, // data is dualAnalog
+	VREvent_DualAnalog_Cancel			= 257, // data is dualAnalog
+
+	VREvent_MouseMove					= 300, // data is mouse
+	VREvent_MouseButtonDown				= 301, // data is mouse
+	VREvent_MouseButtonUp				= 302, // data is mouse
+	VREvent_FocusEnter					= 303, // data is overlay
+	VREvent_FocusLeave					= 304, // data is overlay
+	VREvent_Scroll						= 305, // data is mouse
+	VREvent_TouchPadMove				= 306, // data is mouse
+	VREvent_OverlayFocusChanged			= 307, // data is overlay, global event
+
+	VREvent_InputFocusCaptured			= 400, // data is process DEPRECATED
+	VREvent_InputFocusReleased			= 401, // data is process DEPRECATED
+	VREvent_SceneFocusLost				= 402, // data is process
+	VREvent_SceneFocusGained			= 403, // data is process
+	VREvent_SceneApplicationChanged		= 404, // data is process - The App actually drawing the scene changed (usually to or from the compositor)
+	VREvent_SceneFocusChanged			= 405, // data is process - New app got access to draw the scene
+	VREvent_InputFocusChanged			= 406, // data is process
+	VREvent_SceneApplicationSecondaryRenderingStarted = 407, // data is process
+	VREvent_SceneApplicationUsingWrongGraphicsAdapter = 408, // data is process
+	VREvent_ActionBindingReloaded		 = 409, // data is process - The App that action binds reloaded for
+
+	VREvent_HideRenderModels			= 410, // Sent to the scene application to request hiding render models temporarily
+	VREvent_ShowRenderModels			= 411, // Sent to the scene application to request restoring render model visibility
+
+	VREvent_ConsoleOpened               = 420,
+	VREvent_ConsoleClosed               = 421,
+
+	VREvent_OverlayShown				= 500,
+	VREvent_OverlayHidden				= 501,
+	VREvent_DashboardActivated			= 502,
+	VREvent_DashboardDeactivated		= 503,
+	VREvent_DashboardThumbSelected		= 504, // Sent to the overlay manager - data is overlay
+	VREvent_DashboardRequested			= 505, // Sent to the overlay manager - data is overlay
+	VREvent_ResetDashboard				= 506, // Send to the overlay manager
+	VREvent_RenderToast					= 507, // Send to the dashboard to render a toast - data is the notification ID
+	VREvent_ImageLoaded					= 508, // Sent to overlays when a SetOverlayRaw or SetOverlayFromFile call finishes loading
+	VREvent_ShowKeyboard				= 509, // Sent to keyboard renderer in the dashboard to invoke it
+	VREvent_HideKeyboard				= 510, // Sent to keyboard renderer in the dashboard to hide it
+	VREvent_OverlayGamepadFocusGained	= 511, // Sent to an overlay when IVROverlay::SetFocusOverlay is called on it
+	VREvent_OverlayGamepadFocusLost		= 512, // Send to an overlay when it previously had focus and IVROverlay::SetFocusOverlay is called on something else
+	VREvent_OverlaySharedTextureChanged = 513,
+	//VREvent_DashboardGuideButtonDown	= 514, // These are no longer sent
+	//VREvent_DashboardGuideButtonUp		= 515,
+	VREvent_ScreenshotTriggered			= 516, // Screenshot button combo was pressed, Dashboard should request a screenshot
+	VREvent_ImageFailed					= 517, // Sent to overlays when a SetOverlayRaw or SetOverlayfromFail fails to load
+	VREvent_DashboardOverlayCreated		= 518,
+	VREvent_SwitchGamepadFocus			= 519,
+
+	// Screenshot API
+	VREvent_RequestScreenshot				= 520, // Sent by vrclient application to compositor to take a screenshot
+	VREvent_ScreenshotTaken					= 521, // Sent by compositor to the application that the screenshot has been taken
+	VREvent_ScreenshotFailed				= 522, // Sent by compositor to the application that the screenshot failed to be taken
+	VREvent_SubmitScreenshotToDashboard		= 523, // Sent by compositor to the dashboard that a completed screenshot was submitted
+	VREvent_ScreenshotProgressToDashboard	= 524, // Sent by compositor to the dashboard that a completed screenshot was submitted
+
+	VREvent_PrimaryDashboardDeviceChanged	= 525,
+	VREvent_RoomViewShown					= 526, // Sent by compositor whenever room-view is enabled
+	VREvent_RoomViewHidden					= 527, // Sent by compositor whenever room-view is disabled
+
+	VREvent_Notification_Shown				= 600,
+	VREvent_Notification_Hidden				= 601,
+	VREvent_Notification_BeginInteraction	= 602,
+	VREvent_Notification_Destroyed			= 603,
+
+	VREvent_Quit							= 700, // data is process
+	VREvent_ProcessQuit						= 701, // data is process
+	VREvent_QuitAborted_UserPrompt			= 702, // data is process
+	VREvent_QuitAcknowledged				= 703, // data is process
+	VREvent_DriverRequestedQuit				= 704, // The driver has requested that SteamVR shut down
+
+	VREvent_ChaperoneDataHasChanged			= 800,
+	VREvent_ChaperoneUniverseHasChanged		= 801,
+	VREvent_ChaperoneTempDataHasChanged		= 802,
+	VREvent_ChaperoneSettingsHaveChanged	= 803,
+	VREvent_SeatedZeroPoseReset				= 804,
+
+	VREvent_AudioSettingsHaveChanged		= 820,
+
+	VREvent_BackgroundSettingHasChanged		   = 850,
+	VREvent_CameraSettingsHaveChanged		   = 851,
+	VREvent_ReprojectionSettingHasChanged	   = 852,
+	VREvent_ModelSkinSettingsHaveChanged	   = 853,
+	VREvent_EnvironmentSettingsHaveChanged	   = 854,
+	VREvent_PowerSettingsHaveChanged		   = 855,
+	VREvent_EnableHomeAppSettingsHaveChanged   = 856,
+	VREvent_SteamVRSectionSettingChanged       = 857,
+	VREvent_LighthouseSectionSettingChanged    = 858,
+	VREvent_NullSectionSettingChanged          = 859,
+	VREvent_UserInterfaceSectionSettingChanged = 860,
+	VREvent_NotificationsSectionSettingChanged = 861,
+	VREvent_KeyboardSectionSettingChanged      = 862,
+	VREvent_PerfSectionSettingChanged          = 863,
+	VREvent_DashboardSectionSettingChanged     = 864,
+	VREvent_WebInterfaceSectionSettingChanged  = 865,
+
+	VREvent_StatusUpdate					= 900,
+
+	VREvent_WebInterface_InstallDriverCompleted = 950,
+
+	VREvent_MCImageUpdated					= 1000,
+
+	VREvent_FirmwareUpdateStarted			= 1100,
+	VREvent_FirmwareUpdateFinished			= 1101,
+
+	VREvent_KeyboardClosed					= 1200,
+	VREvent_KeyboardCharInput				= 1201,
+	VREvent_KeyboardDone					= 1202, // Sent when DONE button clicked on keyboard
+
+	VREvent_ApplicationTransitionStarted		= 1300,
+	VREvent_ApplicationTransitionAborted		= 1301,
+	VREvent_ApplicationTransitionNewAppStarted	= 1302,
+	VREvent_ApplicationListUpdated				= 1303,
+	VREvent_ApplicationMimeTypeLoad				= 1304,
+	VREvent_ApplicationTransitionNewAppLaunchComplete = 1305,
+	VREvent_ProcessConnected					= 1306,
+	VREvent_ProcessDisconnected					= 1307,
+
+	VREvent_Compositor_MirrorWindowShown		= 1400,
+	VREvent_Compositor_MirrorWindowHidden		= 1401,
+	VREvent_Compositor_ChaperoneBoundsShown		= 1410,
+	VREvent_Compositor_ChaperoneBoundsHidden	= 1411,
+
+	VREvent_TrackedCamera_StartVideoStream  = 1500,
+	VREvent_TrackedCamera_StopVideoStream   = 1501,
+	VREvent_TrackedCamera_PauseVideoStream  = 1502,
+	VREvent_TrackedCamera_ResumeVideoStream = 1503,
+	VREvent_TrackedCamera_EditingSurface    = 1550,
+
+	VREvent_PerformanceTest_EnableCapture	= 1600,
+	VREvent_PerformanceTest_DisableCapture	= 1601,
+	VREvent_PerformanceTest_FidelityLevel	= 1602,
+
+	VREvent_MessageOverlay_Closed			= 1650,
+	VREvent_MessageOverlayCloseRequested	= 1651,
+	
+	VREvent_Input_HapticVibration			= 1700, // data is hapticVibration
+	VREvent_Input_BindingLoadFailed			= 1701, // data is process
+	VREvent_Input_BindingLoadSuccessful		= 1702, // data is process
+
+	// Vendors are free to expose private events in this reserved region
+	VREvent_VendorSpecific_Reserved_Start	= 10000,
+	VREvent_VendorSpecific_Reserved_End		= 19999,
+};
+
+
+/** Level of Hmd activity */
+// UserInteraction_Timeout means the device is in the process of timing out.
+// InUse = ( k_EDeviceActivityLevel_UserInteraction || k_EDeviceActivityLevel_UserInteraction_Timeout )
+// VREvent_TrackedDeviceUserInteractionStarted fires when the devices transitions from Standby -> UserInteraction or Idle -> UserInteraction.
+// VREvent_TrackedDeviceUserInteractionEnded fires when the devices transitions from UserInteraction_Timeout -> Idle
+enum EDeviceActivityLevel
+{	
+	k_EDeviceActivityLevel_Unknown = -1,									
+	k_EDeviceActivityLevel_Idle = 0,						// No activity for the last 10 seconds
+	k_EDeviceActivityLevel_UserInteraction = 1,				// Activity (movement or prox sensor) is happening now	
+	k_EDeviceActivityLevel_UserInteraction_Timeout = 2,		// No activity for the last 0.5 seconds
+	k_EDeviceActivityLevel_Standby = 3,						// Idle for at least 5 seconds (configurable in Settings -> Power Management)
+};
+
+
+/** VR controller button and axis IDs */
+enum EVRButtonId
+{
+	k_EButton_System			= 0,
+	k_EButton_ApplicationMenu	= 1,
+	k_EButton_Grip				= 2,
+	k_EButton_DPad_Left			= 3,
+	k_EButton_DPad_Up			= 4,
+	k_EButton_DPad_Right		= 5,
+	k_EButton_DPad_Down			= 6,
+	k_EButton_A					= 7,
+	
+	k_EButton_ProximitySensor   = 31,
+
+	k_EButton_Axis0				= 32,
+	k_EButton_Axis1				= 33,
+	k_EButton_Axis2				= 34,
+	k_EButton_Axis3				= 35,
+	k_EButton_Axis4				= 36,
+
+	// aliases for well known controllers
+	k_EButton_SteamVR_Touchpad	= k_EButton_Axis0,
+	k_EButton_SteamVR_Trigger	= k_EButton_Axis1,
+
+	k_EButton_Dashboard_Back	= k_EButton_Grip,
+
+	k_EButton_Max				= 64
+};
+
+inline uint64_t ButtonMaskFromId( EVRButtonId id ) { return 1ull << id; }
+
+/** used for controller button events */
+struct VREvent_Controller_t
+{
+	uint32_t button; // EVRButtonId enum
+};
+
+
+/** used for simulated mouse events in overlay space */
+enum EVRMouseButton
+{
+	VRMouseButton_Left					= 0x0001,
+	VRMouseButton_Right					= 0x0002,
+	VRMouseButton_Middle				= 0x0004,
+};
+
+
+/** used for simulated mouse events in overlay space */
+struct VREvent_Mouse_t
+{
+	float x, y; // co-ords are in GL space, bottom left of the texture is 0,0
+	uint32_t button; // EVRMouseButton enum
+};
+
+/** used for simulated mouse wheel scroll in overlay space */
+struct VREvent_Scroll_t
+{
+	float xdelta, ydelta; // movement in fraction of the pad traversed since last delta, 1.0 for a full swipe
+	uint32_t repeatCount;
+};
+
+/** when in mouse input mode you can receive data from the touchpad, these events are only sent if the users finger
+   is on the touchpad (or just released from it). These events are sent to overlays with the VROverlayFlags_SendVRTouchpadEvents
+   flag set.
+**/
+struct VREvent_TouchPadMove_t
+{
+	// true if the users finger is detected on the touch pad
+	bool bFingerDown;
+
+	// How long the finger has been down in seconds
+	float flSecondsFingerDown;
+
+	// These values indicate the starting finger position (so you can do some basic swipe stuff)
+	float fValueXFirst;
+	float fValueYFirst;
+
+	// This is the raw sampled coordinate without deadzoning
+	float fValueXRaw;
+	float fValueYRaw;
+};
+
+/** notification related events. Details will still change at this point */
+struct VREvent_Notification_t
+{
+	uint64_t ulUserValue;
+	uint32_t notificationId;
+};
+
+/** Used for events about processes */
+struct VREvent_Process_t
+{
+	uint32_t pid;
+	uint32_t oldPid;
+	bool bForced;
+};
+
+
+/** Used for a few events about overlays */
+struct VREvent_Overlay_t
+{
+	uint64_t overlayHandle;
+	uint64_t devicePath;
+};
+
+
+/** Used for a few events about overlays */
+struct VREvent_Status_t
+{
+	uint32_t statusState; // EVRState enum
+};
+
+/** Used for keyboard events **/
+struct VREvent_Keyboard_t
+{
+	char cNewInput[8];	// Up to 11 bytes of new input
+	uint64_t uUserValue;	// Possible flags about the new input
+};
+
+struct VREvent_Ipd_t
+{
+	float ipdMeters;
+};
+
+struct VREvent_Chaperone_t
+{
+	uint64_t m_nPreviousUniverse;
+	uint64_t m_nCurrentUniverse;
+};
+
+/** Not actually used for any events */
+struct VREvent_Reserved_t
+{
+	uint64_t reserved0;
+	uint64_t reserved1;
+	uint64_t reserved2;
+	uint64_t reserved3;
+};
+
+struct VREvent_PerformanceTest_t
+{
+	uint32_t m_nFidelityLevel;
+};
+
+struct VREvent_SeatedZeroPoseReset_t
+{
+	bool bResetBySystemMenu;
+};
+
+struct VREvent_Screenshot_t
+{
+	uint32_t handle;
+	uint32_t type;
+};
+
+struct VREvent_ScreenshotProgress_t
+{
+	float progress;
+};
+
+struct VREvent_ApplicationLaunch_t
+{
+	uint32_t pid;
+	uint32_t unArgsHandle;
+};
+
+struct VREvent_EditingCameraSurface_t
+{
+	uint64_t overlayHandle;
+	uint32_t nVisualMode;
+};
+
+struct VREvent_MessageOverlay_t
+{
+	uint32_t unVRMessageOverlayResponse; // vr::VRMessageOverlayResponse enum
+};
+
+struct VREvent_Property_t
+{
+	PropertyContainerHandle_t container;
+	ETrackedDeviceProperty prop;
+};
+
+enum EDualAnalogWhich
+{
+	k_EDualAnalog_Left = 0,
+	k_EDualAnalog_Right = 1,
+};
+
+struct VREvent_DualAnalog_t
+{
+	float x, y; // coordinates are -1..1 analog values
+	float transformedX, transformedY; // transformed by the center and radius numbers provided by the overlay
+	EDualAnalogWhich which;
+};
+
+struct VREvent_HapticVibration_t
+{
+	uint64_t containerHandle; // property container handle of the device with the haptic component
+	uint64_t componentHandle; // Which haptic component needs to vibrate
+	float fDurationSeconds;
+	float fFrequency;
+	float fAmplitude;
+};
+
+struct VREvent_WebConsole_t
+{
+	WebConsoleHandle_t webConsoleHandle;
+};
+
+struct VREvent_InputBindingLoad_t
+{
+	vr::PropertyContainerHandle_t ulAppContainer;
+	uint64_t pathMessage;
+	uint64_t pathUrl;
+};
+
+
+/** NOTE!!! If you change this you MUST manually update openvr_interop.cs.py */
+typedef union
+{
+	VREvent_Reserved_t reserved;
+	VREvent_Controller_t controller;
+	VREvent_Mouse_t mouse;
+	VREvent_Scroll_t scroll;
+	VREvent_Process_t process;
+	VREvent_Notification_t notification;
+	VREvent_Overlay_t overlay;
+	VREvent_Status_t status;
+	VREvent_Keyboard_t keyboard;
+	VREvent_Ipd_t ipd;
+	VREvent_Chaperone_t chaperone;
+	VREvent_PerformanceTest_t performanceTest;
+	VREvent_TouchPadMove_t touchPadMove;
+	VREvent_SeatedZeroPoseReset_t seatedZeroPoseReset;
+	VREvent_Screenshot_t screenshot;
+	VREvent_ScreenshotProgress_t screenshotProgress;
+	VREvent_ApplicationLaunch_t applicationLaunch;
+	VREvent_EditingCameraSurface_t cameraSurface;
+	VREvent_MessageOverlay_t messageOverlay;
+	VREvent_Property_t property;
+	VREvent_DualAnalog_t dualAnalog;
+	VREvent_HapticVibration_t hapticVibration;
+	VREvent_WebConsole_t webConsole;
+	VREvent_InputBindingLoad_t inputBinding;
+} VREvent_Data_t;
+
+
+#if defined(__linux__) || defined(__APPLE__) 
+// This structure was originally defined mis-packed on Linux, preserved for 
+// compatibility. 
+#pragma pack( push, 4 )
+#endif
+
+/** An event posted by the server to all running applications */
+struct VREvent_t
+{
+	uint32_t eventType; // EVREventType enum
+	TrackedDeviceIndex_t trackedDeviceIndex;
+	float eventAgeSeconds;
+	// event data must be the end of the struct as its size is variable
+	VREvent_Data_t data;
+};
+
+#if defined(__linux__) || defined(__APPLE__) 
+#pragma pack( pop )
+#endif
+
+enum EVRInputError
+{
+	VRInputError_None = 0,
+	VRInputError_NameNotFound = 1,
+	VRInputError_WrongType = 2,
+	VRInputError_InvalidHandle = 3,
+	VRInputError_InvalidParam = 4,
+	VRInputError_NoSteam = 5,
+	VRInputError_MaxCapacityReached = 6,
+	VRInputError_IPCError = 7,
+	VRInputError_NoActiveActionSet = 8,
+	VRInputError_InvalidDevice = 9,
+	VRInputError_InvalidSkeleton = 10,
+	VRInputError_InvalidBoneCount = 11,
+	VRInputError_InvalidCompressedData = 12,
+	VRInputError_NoData = 13,
+	VRInputError_BufferTooSmall = 14,
+	VRInputError_MismatchedActionManifest = 15,
+};
+
+
+/** The mesh to draw into the stencil (or depth) buffer to perform 
+* early stencil (or depth) kills of pixels that will never appear on the HMD.
+* This mesh draws on all the pixels that will be hidden after distortion. 
+*
+* If the HMD does not provide a visible area mesh pVertexData will be
+* NULL and unTriangleCount will be 0. */
+struct HiddenAreaMesh_t
+{
+	const HmdVector2_t *pVertexData;
+	uint32_t unTriangleCount;
+};
+
+
+enum EHiddenAreaMeshType
+{
+	k_eHiddenAreaMesh_Standard = 0,
+	k_eHiddenAreaMesh_Inverse = 1,
+	k_eHiddenAreaMesh_LineLoop = 2,
+
+	k_eHiddenAreaMesh_Max = 3,
+};
+
+
+/** Identifies what kind of axis is on the controller at index n. Read this type 
+* with pVRSystem->Get( nControllerDeviceIndex, Prop_Axis0Type_Int32 + n );
+*/
+enum EVRControllerAxisType
+{
+	k_eControllerAxis_None = 0,
+	k_eControllerAxis_TrackPad = 1,
+	k_eControllerAxis_Joystick = 2,
+	k_eControllerAxis_Trigger = 3, // Analog trigger data is in the X axis
+};
+
+
+/** contains information about one axis on the controller */
+struct VRControllerAxis_t
+{
+	float x; // Ranges from -1.0 to 1.0 for joysticks and track pads. Ranges from 0.0 to 1.0 for triggers were 0 is fully released.
+	float y; // Ranges from -1.0 to 1.0 for joysticks and track pads. Is always 0.0 for triggers.
+};
+
+
+/** the number of axes in the controller state */
+static const uint32_t k_unControllerStateAxisCount = 5;
+
+
+#if defined(__linux__) || defined(__APPLE__) 
+// This structure was originally defined mis-packed on Linux, preserved for 
+// compatibility. 
+#pragma pack( push, 4 )
+#endif
+
+/** Holds all the state of a controller at one moment in time. */
+struct VRControllerState001_t
+{
+	// If packet num matches that on your prior call, then the controller state hasn't been changed since 
+	// your last call and there is no need to process it
+	uint32_t unPacketNum;
+
+	// bit flags for each of the buttons. Use ButtonMaskFromId to turn an ID into a mask
+	uint64_t ulButtonPressed;
+	uint64_t ulButtonTouched;
+
+	// Axis data for the controller's analog inputs
+	VRControllerAxis_t rAxis[ k_unControllerStateAxisCount ];
+};
+#if defined(__linux__) || defined(__APPLE__) 
+#pragma pack( pop )
+#endif
+
+
+typedef VRControllerState001_t VRControllerState_t;
+
+
+/** determines how to provide output to the application of various event processing functions. */
+enum EVRControllerEventOutputType
+{
+	ControllerEventOutput_OSEvents = 0,
+	ControllerEventOutput_VREvents = 1,
+};
+
+
+
+/** Collision Bounds Style */
+enum ECollisionBoundsStyle
+{
+	COLLISION_BOUNDS_STYLE_BEGINNER = 0,
+	COLLISION_BOUNDS_STYLE_INTERMEDIATE,
+	COLLISION_BOUNDS_STYLE_SQUARES,
+	COLLISION_BOUNDS_STYLE_ADVANCED,
+	COLLISION_BOUNDS_STYLE_NONE,
+
+	COLLISION_BOUNDS_STYLE_COUNT
+};
+
+/** Allows the application to customize how the overlay appears in the compositor */
+struct Compositor_OverlaySettings
+{
+	uint32_t size; // sizeof(Compositor_OverlaySettings)
+	bool curved, antialias;
+	float scale, distance, alpha;
+	float uOffset, vOffset, uScale, vScale;
+	float gridDivs, gridWidth, gridScale;
+	HmdMatrix44_t transform;
+};
+
+/** used to refer to a single VR overlay */
+typedef uint64_t VROverlayHandle_t;
+
+static const VROverlayHandle_t k_ulOverlayHandleInvalid = 0;
+
+/** Errors that can occur around VR overlays */
+enum EVROverlayError
+{
+	VROverlayError_None						= 0,
+
+	VROverlayError_UnknownOverlay			= 10,
+	VROverlayError_InvalidHandle			= 11,
+	VROverlayError_PermissionDenied			= 12,
+	VROverlayError_OverlayLimitExceeded		= 13, // No more overlays could be created because the maximum number already exist
+	VROverlayError_WrongVisibilityType		= 14,
+	VROverlayError_KeyTooLong				= 15,
+	VROverlayError_NameTooLong				= 16,
+	VROverlayError_KeyInUse					= 17,
+	VROverlayError_WrongTransformType		= 18,
+	VROverlayError_InvalidTrackedDevice		= 19,
+	VROverlayError_InvalidParameter			= 20,
+	VROverlayError_ThumbnailCantBeDestroyed	= 21,
+	VROverlayError_ArrayTooSmall			= 22,
+	VROverlayError_RequestFailed			= 23,
+	VROverlayError_InvalidTexture			= 24,
+	VROverlayError_UnableToLoadFile			= 25,
+	VROverlayError_KeyboardAlreadyInUse		= 26,
+	VROverlayError_NoNeighbor				= 27,
+	VROverlayError_TooManyMaskPrimitives	= 29,
+	VROverlayError_BadMaskPrimitive			= 30,
+	VROverlayError_TextureAlreadyLocked		= 31,
+	VROverlayError_TextureLockCapacityReached = 32,
+	VROverlayError_TextureNotLocked			= 33,
+};
+
+/** enum values to pass in to VR_Init to identify whether the application will 
+* draw a 3D scene. */
+enum EVRApplicationType
+{
+	VRApplication_Other = 0,		// Some other kind of application that isn't covered by the other entries 
+	VRApplication_Scene	= 1,		// Application will submit 3D frames 
+	VRApplication_Overlay = 2,		// Application only interacts with overlays
+	VRApplication_Background = 3,	// Application should not start SteamVR if it's not already running, and should not
+									// keep it running if everything else quits.
+	VRApplication_Utility = 4,		// Init should not try to load any drivers. The application needs access to utility
+									// interfaces (like IVRSettings and IVRApplications) but not hardware.
+	VRApplication_VRMonitor = 5,	// Reserved for vrmonitor
+	VRApplication_SteamWatchdog = 6,// Reserved for Steam
+	VRApplication_Bootstrapper = 7, // Start up SteamVR
+
+	VRApplication_Max
+};
+
+
+/** error codes for firmware */
+enum EVRFirmwareError
+{
+	VRFirmwareError_None = 0,
+	VRFirmwareError_Success = 1,
+	VRFirmwareError_Fail = 2,
+};
+
+
+/** error codes for notifications */
+enum EVRNotificationError
+{
+	VRNotificationError_OK = 0,
+	VRNotificationError_InvalidNotificationId = 100,
+	VRNotificationError_NotificationQueueFull = 101,
+	VRNotificationError_InvalidOverlayHandle = 102,
+	VRNotificationError_SystemWithUserValueAlreadyExists = 103,
+};
+
+
+/** Holds the transform for a single bone */
+struct VRBoneTransform_t
+{
+	HmdVector4_t position;
+	HmdQuaternionf_t orientation;
+};
+
+
+/** error codes returned by Vr_Init */
+
+// Please add adequate error description to https://developer.valvesoftware.com/w/index.php?title=Category:SteamVRHelp
+enum EVRInitError
+{
+	VRInitError_None	= 0,
+	VRInitError_Unknown = 1,
+
+	VRInitError_Init_InstallationNotFound			= 100,
+	VRInitError_Init_InstallationCorrupt			= 101,
+	VRInitError_Init_VRClientDLLNotFound			= 102,
+	VRInitError_Init_FileNotFound					= 103,
+	VRInitError_Init_FactoryNotFound				= 104,
+	VRInitError_Init_InterfaceNotFound				= 105,
+	VRInitError_Init_InvalidInterface				= 106,
+	VRInitError_Init_UserConfigDirectoryInvalid		= 107,
+	VRInitError_Init_HmdNotFound					= 108,
+	VRInitError_Init_NotInitialized					= 109,
+	VRInitError_Init_PathRegistryNotFound			= 110,
+	VRInitError_Init_NoConfigPath					= 111,
+	VRInitError_Init_NoLogPath						= 112,
+	VRInitError_Init_PathRegistryNotWritable		= 113,
+	VRInitError_Init_AppInfoInitFailed				= 114,
+	VRInitError_Init_Retry							= 115, // Used internally to cause retries to vrserver
+	VRInitError_Init_InitCanceledByUser				= 116, // The calling application should silently exit. The user canceled app startup
+	VRInitError_Init_AnotherAppLaunching			= 117, 
+	VRInitError_Init_SettingsInitFailed				= 118, 
+	VRInitError_Init_ShuttingDown					= 119,
+	VRInitError_Init_TooManyObjects					= 120,
+	VRInitError_Init_NoServerForBackgroundApp		= 121,
+	VRInitError_Init_NotSupportedWithCompositor		= 122,
+	VRInitError_Init_NotAvailableToUtilityApps		= 123,
+	VRInitError_Init_Internal				 		= 124,
+	VRInitError_Init_HmdDriverIdIsNone		 		= 125,
+	VRInitError_Init_HmdNotFoundPresenceFailed 		= 126,
+	VRInitError_Init_VRMonitorNotFound				= 127,
+	VRInitError_Init_VRMonitorStartupFailed			= 128,
+	VRInitError_Init_LowPowerWatchdogNotSupported	= 129, 
+	VRInitError_Init_InvalidApplicationType			= 130,
+	VRInitError_Init_NotAvailableToWatchdogApps		= 131,
+	VRInitError_Init_WatchdogDisabledInSettings		= 132,
+	VRInitError_Init_VRDashboardNotFound			= 133,
+	VRInitError_Init_VRDashboardStartupFailed		= 134,
+	VRInitError_Init_VRHomeNotFound					= 135,
+	VRInitError_Init_VRHomeStartupFailed			= 136,
+	VRInitError_Init_RebootingBusy					= 137,
+	VRInitError_Init_FirmwareUpdateBusy				= 138,
+	VRInitError_Init_FirmwareRecoveryBusy			= 139,
+	VRInitError_Init_USBServiceBusy					= 140,
+	VRInitError_Init_VRWebHelperStartupFailed		= 141,
+
+	VRInitError_Driver_Failed						= 200,
+	VRInitError_Driver_Unknown						= 201,
+	VRInitError_Driver_HmdUnknown					= 202,
+	VRInitError_Driver_NotLoaded					= 203,
+	VRInitError_Driver_RuntimeOutOfDate				= 204,
+	VRInitError_Driver_HmdInUse						= 205,
+	VRInitError_Driver_NotCalibrated				= 206,
+	VRInitError_Driver_CalibrationInvalid			= 207,
+	VRInitError_Driver_HmdDisplayNotFound			= 208,
+	VRInitError_Driver_TrackedDeviceInterfaceUnknown = 209,
+	// VRInitError_Driver_HmdDisplayNotFoundAfterFix = 210, // not needed: here for historic reasons
+	VRInitError_Driver_HmdDriverIdOutOfBounds		= 211,
+	VRInitError_Driver_HmdDisplayMirrored			= 212,
+
+	VRInitError_IPC_ServerInitFailed				= 300,
+	VRInitError_IPC_ConnectFailed					= 301,
+	VRInitError_IPC_SharedStateInitFailed			= 302,
+	VRInitError_IPC_CompositorInitFailed			= 303,
+	VRInitError_IPC_MutexInitFailed					= 304,
+	VRInitError_IPC_Failed							= 305,
+	VRInitError_IPC_CompositorConnectFailed			= 306,
+	VRInitError_IPC_CompositorInvalidConnectResponse = 307,
+	VRInitError_IPC_ConnectFailedAfterMultipleAttempts = 308,
+
+	VRInitError_Compositor_Failed					= 400,
+	VRInitError_Compositor_D3D11HardwareRequired	= 401,
+	VRInitError_Compositor_FirmwareRequiresUpdate	= 402,
+	VRInitError_Compositor_OverlayInitFailed		= 403,
+	VRInitError_Compositor_ScreenshotsInitFailed	= 404,
+	VRInitError_Compositor_UnableToCreateDevice		= 405,
+
+	VRInitError_VendorSpecific_UnableToConnectToOculusRuntime		= 1000,
+	VRInitError_VendorSpecific_WindowsNotInDevMode					= 1001,
+
+	VRInitError_VendorSpecific_HmdFound_CantOpenDevice 				= 1101,
+	VRInitError_VendorSpecific_HmdFound_UnableToRequestConfigStart	= 1102,
+	VRInitError_VendorSpecific_HmdFound_NoStoredConfig 				= 1103,
+	VRInitError_VendorSpecific_HmdFound_ConfigTooBig 				= 1104,
+	VRInitError_VendorSpecific_HmdFound_ConfigTooSmall 				= 1105,
+	VRInitError_VendorSpecific_HmdFound_UnableToInitZLib 			= 1106,
+	VRInitError_VendorSpecific_HmdFound_CantReadFirmwareVersion 	= 1107,
+	VRInitError_VendorSpecific_HmdFound_UnableToSendUserDataStart	= 1108,
+	VRInitError_VendorSpecific_HmdFound_UnableToGetUserDataStart	= 1109,
+	VRInitError_VendorSpecific_HmdFound_UnableToGetUserDataNext		= 1110,
+	VRInitError_VendorSpecific_HmdFound_UserDataAddressRange		= 1111,
+	VRInitError_VendorSpecific_HmdFound_UserDataError				= 1112,
+	VRInitError_VendorSpecific_HmdFound_ConfigFailedSanityCheck		= 1113,
+
+	VRInitError_Steam_SteamInstallationNotFound = 2000,
+};
+
+enum EVRScreenshotType
+{
+	VRScreenshotType_None = 0,
+	VRScreenshotType_Mono = 1, // left eye only
+	VRScreenshotType_Stereo = 2,
+	VRScreenshotType_Cubemap = 3,
+	VRScreenshotType_MonoPanorama = 4,
+	VRScreenshotType_StereoPanorama = 5
+};
+
+enum EVRScreenshotPropertyFilenames
+{
+	VRScreenshotPropertyFilenames_Preview = 0,
+	VRScreenshotPropertyFilenames_VR = 1,
+};
+
+enum EVRTrackedCameraError
+{
+	VRTrackedCameraError_None                       = 0,
+	VRTrackedCameraError_OperationFailed            = 100,
+	VRTrackedCameraError_InvalidHandle              = 101,	
+	VRTrackedCameraError_InvalidFrameHeaderVersion  = 102,
+	VRTrackedCameraError_OutOfHandles               = 103,
+	VRTrackedCameraError_IPCFailure                 = 104,
+	VRTrackedCameraError_NotSupportedForThisDevice  = 105,
+	VRTrackedCameraError_SharedMemoryFailure        = 106,
+	VRTrackedCameraError_FrameBufferingFailure      = 107,
+	VRTrackedCameraError_StreamSetupFailure         = 108,
+	VRTrackedCameraError_InvalidGLTextureId         = 109,
+	VRTrackedCameraError_InvalidSharedTextureHandle = 110,
+	VRTrackedCameraError_FailedToGetGLTextureId     = 111,
+	VRTrackedCameraError_SharedTextureFailure       = 112,
+	VRTrackedCameraError_NoFrameAvailable           = 113,
+	VRTrackedCameraError_InvalidArgument            = 114,
+	VRTrackedCameraError_InvalidFrameBufferSize     = 115,
+};
+
+enum EVRTrackedCameraFrameLayout
+{
+	EVRTrackedCameraFrameLayout_Mono				= 0x0001,
+	EVRTrackedCameraFrameLayout_Stereo				= 0x0002,
+	EVRTrackedCameraFrameLayout_VerticalLayout		= 0x0010,	// Stereo frames are Top/Bottom (left/right)
+	EVRTrackedCameraFrameLayout_HorizontalLayout	= 0x0020,	// Stereo frames are Left/Right
+};
+	
+enum EVRTrackedCameraFrameType
+{
+	VRTrackedCameraFrameType_Distorted = 0,			// This is the camera video frame size in pixels, still distorted.
+	VRTrackedCameraFrameType_Undistorted,			// In pixels, an undistorted inscribed rectangle region without invalid regions. This size is subject to changes shortly.
+	VRTrackedCameraFrameType_MaximumUndistorted,	// In pixels, maximum undistorted with invalid regions. Non zero alpha component identifies valid regions.
+	MAX_CAMERA_FRAME_TYPES
+};
+
+typedef uint64_t TrackedCameraHandle_t;
+#define INVALID_TRACKED_CAMERA_HANDLE	((vr::TrackedCameraHandle_t)0)
+
+struct CameraVideoStreamFrameHeader_t
+{
+	EVRTrackedCameraFrameType eFrameType;
+
+	uint32_t nWidth;
+	uint32_t nHeight;
+	uint32_t nBytesPerPixel;
+
+	uint32_t nFrameSequence;
+
+	TrackedDevicePose_t standingTrackedDevicePose;
+};
+
+// Screenshot types
+typedef uint32_t ScreenshotHandle_t;
+
+static const uint32_t k_unScreenshotHandleInvalid = 0;
+
+/** Frame timing data provided by direct mode drivers. */
+struct DriverDirectMode_FrameTiming
+{
+	uint32_t m_nSize; // Set to sizeof( DriverDirectMode_FrameTiming )
+	uint32_t m_nNumFramePresents; // number of times frame was presented
+	uint32_t m_nNumMisPresented; // number of times frame was presented on a vsync other than it was originally predicted to
+	uint32_t m_nNumDroppedFrames; // number of additional times previous frame was scanned out (i.e. compositor missed vsync)
+	uint32_t m_nReprojectionFlags;
+};
+
+enum EVSync
+{
+	VSync_None,
+	VSync_WaitRender,	// block following render work until vsync
+	VSync_NoWaitRender,	// do not block following render work (allow to get started early)
+};
+
+/** raw IMU data provided by IVRIOBuffer from paths to tracked devices with IMUs */
+enum Imu_OffScaleFlags
+{
+	OffScale_AccelX	= 0x01,
+	OffScale_AccelY	= 0x02,
+	OffScale_AccelZ	= 0x04,
+	OffScale_GyroX	= 0x08,
+	OffScale_GyroY	= 0x10,
+	OffScale_GyroZ	= 0x20,
+};
+	
+struct ImuSample_t
+{
+	double fSampleTime;
+	HmdVector3d_t vAccel;
+	HmdVector3d_t vGyro;
+	uint32_t unOffScaleFlags;
+};
+
+#pragma pack( pop )
+
+// figure out how to import from the VR API dll
+#if defined(_WIN32)
+
+#ifdef VR_API_EXPORT
+#define VR_INTERFACE extern "C" __declspec( dllexport )
+#else
+#define VR_INTERFACE extern "C" __declspec( dllimport )
+#endif
+
+#elif defined(__GNUC__) || defined(COMPILER_GCC) || defined(__APPLE__)
+
+#ifdef VR_API_EXPORT
+#define VR_INTERFACE extern "C" __attribute__((visibility("default")))
+#else
+#define VR_INTERFACE extern "C" 
+#endif
+
+#else
+#error "Unsupported Platform."
+#endif
+
+
+#if defined( _WIN32 )
+#define VR_CALLTYPE __cdecl
+#else
+#define VR_CALLTYPE 
+#endif
+
+} // namespace vr
+
+#endif // _INCLUDE_VRTYPES_H
+
+
+// vrannotation.h
+#ifdef API_GEN
+# define VR_CLANG_ATTR(ATTR) __attribute__((annotate( ATTR )))
+#else
+# define VR_CLANG_ATTR(ATTR)
+#endif
+
+#define VR_METHOD_DESC(DESC) VR_CLANG_ATTR( "desc:" #DESC ";" )
+#define VR_IGNOREATTR() VR_CLANG_ATTR( "ignore" )
+#define VR_OUT_STRUCT() VR_CLANG_ATTR( "out_struct: ;" )
+#define VR_OUT_STRING() VR_CLANG_ATTR( "out_string: ;" )
+#define VR_OUT_ARRAY_CALL(COUNTER,FUNCTION,PARAMS) VR_CLANG_ATTR( "out_array_call:" #COUNTER "," #FUNCTION "," #PARAMS ";" )
+#define VR_OUT_ARRAY_COUNT(COUNTER) VR_CLANG_ATTR( "out_array_count:" #COUNTER ";" )
+#define VR_ARRAY_COUNT(COUNTER) VR_CLANG_ATTR( "array_count:" #COUNTER ";" )
+#define VR_ARRAY_COUNT_D(COUNTER, DESC) VR_CLANG_ATTR( "array_count:" #COUNTER ";desc:" #DESC )
+#define VR_BUFFER_COUNT(COUNTER) VR_CLANG_ATTR( "buffer_count:" #COUNTER ";" )
+#define VR_OUT_BUFFER_COUNT(COUNTER) VR_CLANG_ATTR( "out_buffer_count:" #COUNTER ";" )
+#define VR_OUT_STRING_COUNT(COUNTER) VR_CLANG_ATTR( "out_string_count:" #COUNTER ";" )
+
+// ivrsystem.h
+namespace vr
+{
+
+class IVRSystem
+{
+public:
+
+
+	// ------------------------------------
+	// Display Methods
+	// ------------------------------------
+
+	/** Suggested size for the intermediate render target that the distortion pulls from. */
+	virtual void GetRecommendedRenderTargetSize( uint32_t *pnWidth, uint32_t *pnHeight ) = 0;
+
+	/** The projection matrix for the specified eye */
+	virtual HmdMatrix44_t GetProjectionMatrix( EVREye eEye, float fNearZ, float fFarZ ) = 0;
+
+	/** The components necessary to build your own projection matrix in case your
+	* application is doing something fancy like infinite Z */
+	virtual void GetProjectionRaw( EVREye eEye, float *pfLeft, float *pfRight, float *pfTop, float *pfBottom ) = 0;
+
+	/** Gets the result of the distortion function for the specified eye and input UVs. UVs go from 0,0 in 
+	* the upper left of that eye's viewport and 1,1 in the lower right of that eye's viewport.
+	* Returns true for success. Otherwise, returns false, and distortion coordinates are not suitable. */
+	virtual bool ComputeDistortion( EVREye eEye, float fU, float fV, DistortionCoordinates_t *pDistortionCoordinates ) = 0;
+
+	/** Returns the transform from eye space to the head space. Eye space is the per-eye flavor of head
+	* space that provides stereo disparity. Instead of Model * View * Projection the sequence is Model * View * Eye^-1 * Projection. 
+	* Normally View and Eye^-1 will be multiplied together and treated as View in your application. 
+	*/
+	virtual HmdMatrix34_t GetEyeToHeadTransform( EVREye eEye ) = 0;
+
+	/** Returns the number of elapsed seconds since the last recorded vsync event. This 
+	*	will come from a vsync timer event in the timer if possible or from the application-reported
+	*   time if that is not available. If no vsync times are available the function will 
+	*   return zero for vsync time and frame counter and return false from the method. */
+	virtual bool GetTimeSinceLastVsync( float *pfSecondsSinceLastVsync, uint64_t *pulFrameCounter ) = 0;
+
+	/** [D3D9 Only]
+	* Returns the adapter index that the user should pass into CreateDevice to set up D3D9 in such
+	* a way that it can go full screen exclusive on the HMD. Returns -1 if there was an error.
+	*/
+	virtual int32_t GetD3D9AdapterIndex() = 0;
+
+	/** [D3D10/11 Only]
+	* Returns the adapter index that the user should pass into EnumAdapters to create the device 
+	* and swap chain in DX10 and DX11. If an error occurs the index will be set to -1.
+	*/
+	virtual void GetDXGIOutputInfo( int32_t *pnAdapterIndex ) = 0;
+	
+	/**
+	 * Returns platform- and texture-type specific adapter identification so that applications and the
+	 * compositor are creating textures and swap chains on the same GPU. If an error occurs the device
+	 * will be set to 0.
+	 * pInstance is an optional parameter that is required only when textureType is TextureType_Vulkan.
+	 * [D3D10/11/12 Only (D3D9 Not Supported)]
+	 *  Returns the adapter LUID that identifies the GPU attached to the HMD. The user should
+	 *  enumerate all adapters using IDXGIFactory::EnumAdapters and IDXGIAdapter::GetDesc to find
+	 *  the adapter with the matching LUID, or use IDXGIFactory4::EnumAdapterByLuid.
+	 *  The discovered IDXGIAdapter should be used to create the device and swap chain.
+	 * [Vulkan Only]
+	 *  Returns the VkPhysicalDevice that should be used by the application.
+	 *  pInstance must be the instance the application will use to query for the VkPhysicalDevice.  The application
+	 *  must create the VkInstance with extensions returned by IVRCompositor::GetVulkanInstanceExtensionsRequired enabled.
+	 * [macOS Only]
+	 *  For TextureType_IOSurface returns the id<MTLDevice> that should be used by the application.
+	 *  On 10.13+ for TextureType_OpenGL returns the 'registryId' of the renderer which should be used
+	 *   by the application. See Apple Technical Q&A QA1168 for information on enumerating GL Renderers, and the
+	 *   new kCGLRPRegistryIDLow and kCGLRPRegistryIDHigh CGLRendererProperty values in the 10.13 SDK.
+	 *  Pre 10.13 for TextureType_OpenGL returns 0, as there is no dependable way to correlate the HMDs MTLDevice
+	 *   with a GL Renderer.
+	 */
+	virtual void GetOutputDevice( uint64_t *pnDevice, ETextureType textureType, VkInstance_T *pInstance = nullptr ) = 0;
+
+	// ------------------------------------
+	// Display Mode methods
+	// ------------------------------------
+
+	/** Use to determine if the headset display is part of the desktop (i.e. extended) or hidden (i.e. direct mode). */
+	virtual bool IsDisplayOnDesktop() = 0;
+
+	/** Set the display visibility (true = extended, false = direct mode).  Return value of true indicates that the change was successful. */
+	virtual bool SetDisplayVisibility( bool bIsVisibleOnDesktop ) = 0;
+
+	// ------------------------------------
+	// Tracking Methods
+	// ------------------------------------
+
+	/** The pose that the tracker thinks that the HMD will be in at the specified number of seconds into the 
+	* future. Pass 0 to get the state at the instant the method is called. Most of the time the application should
+	* calculate the time until the photons will be emitted from the display and pass that time into the method.
+	*
+	* This is roughly analogous to the inverse of the view matrix in most applications, though 
+	* many games will need to do some additional rotation or translation on top of the rotation
+	* and translation provided by the head pose.
+	*
+	* For devices where bPoseIsValid is true the application can use the pose to position the device
+	* in question. The provided array can be any size up to k_unMaxTrackedDeviceCount. 
+	*
+	* Seated experiences should call this method with TrackingUniverseSeated and receive poses relative
+	* to the seated zero pose. Standing experiences should call this method with TrackingUniverseStanding 
+	* and receive poses relative to the Chaperone Play Area. TrackingUniverseRawAndUncalibrated should 
+	* probably not be used unless the application is the Chaperone calibration tool itself, but will provide
+	* poses relative to the hardware-specific coordinate system in the driver.
+	*/
+	virtual void GetDeviceToAbsoluteTrackingPose( ETrackingUniverseOrigin eOrigin, float fPredictedSecondsToPhotonsFromNow, VR_ARRAY_COUNT(unTrackedDevicePoseArrayCount) TrackedDevicePose_t *pTrackedDevicePoseArray, uint32_t unTrackedDevicePoseArrayCount ) = 0;
+
+	/** Sets the zero pose for the seated tracker coordinate system to the current position and yaw of the HMD. After 
+	* ResetSeatedZeroPose all GetDeviceToAbsoluteTrackingPose calls that pass TrackingUniverseSeated as the origin 
+	* will be relative to this new zero pose. The new zero coordinate system will not change the fact that the Y axis 
+	* is up in the real world, so the next pose returned from GetDeviceToAbsoluteTrackingPose after a call to 
+	* ResetSeatedZeroPose may not be exactly an identity matrix.
+	*
+	* NOTE: This function overrides the user's previously saved seated zero pose and should only be called as the result of a user action. 
+	* Users are also able to set their seated zero pose via the OpenVR Dashboard.
+	**/
+	virtual void ResetSeatedZeroPose() = 0;
+
+	/** Returns the transform from the seated zero pose to the standing absolute tracking system. This allows 
+	* applications to represent the seated origin to used or transform object positions from one coordinate
+	* system to the other. 
+	*
+	* The seated origin may or may not be inside the Play Area or Collision Bounds returned by IVRChaperone. Its position 
+	* depends on what the user has set from the Dashboard settings and previous calls to ResetSeatedZeroPose. */
+	virtual HmdMatrix34_t GetSeatedZeroPoseToStandingAbsoluteTrackingPose() = 0;
+
+	/** Returns the transform from the tracking origin to the standing absolute tracking system. This allows
+	* applications to convert from raw tracking space to the calibrated standing coordinate system. */
+	virtual HmdMatrix34_t GetRawZeroPoseToStandingAbsoluteTrackingPose() = 0;
+
+	/** Get a sorted array of device indices of a given class of tracked devices (e.g. controllers).  Devices are sorted right to left
+	* relative to the specified tracked device (default: hmd -- pass in -1 for absolute tracking space).  Returns the number of devices
+	* in the list, or the size of the array needed if not large enough. */
+	virtual uint32_t GetSortedTrackedDeviceIndicesOfClass( ETrackedDeviceClass eTrackedDeviceClass, VR_ARRAY_COUNT(unTrackedDeviceIndexArrayCount) vr::TrackedDeviceIndex_t *punTrackedDeviceIndexArray, uint32_t unTrackedDeviceIndexArrayCount, vr::TrackedDeviceIndex_t unRelativeToTrackedDeviceIndex = k_unTrackedDeviceIndex_Hmd ) = 0;
+
+	/** Returns the level of activity on the device. */
+	virtual EDeviceActivityLevel GetTrackedDeviceActivityLevel( vr::TrackedDeviceIndex_t unDeviceId ) = 0;
+
+	/** Convenience utility to apply the specified transform to the specified pose.
+	*   This properly transforms all pose components, including velocity and angular velocity
+	*/
+	virtual void ApplyTransform( TrackedDevicePose_t *pOutputPose, const TrackedDevicePose_t *pTrackedDevicePose, const HmdMatrix34_t *pTransform ) = 0;
+
+	/** Returns the device index associated with a specific role, for example the left hand or the right hand. */
+	virtual vr::TrackedDeviceIndex_t GetTrackedDeviceIndexForControllerRole( vr::ETrackedControllerRole unDeviceType ) = 0;
+
+	/** Returns the controller type associated with a device index. */
+	virtual vr::ETrackedControllerRole GetControllerRoleForTrackedDeviceIndex( vr::TrackedDeviceIndex_t unDeviceIndex ) = 0;
+
+	// ------------------------------------
+	// Property methods
+	// ------------------------------------
+
+	/** Returns the device class of a tracked device. If there has not been a device connected in this slot
+	* since the application started this function will return TrackedDevice_Invalid. For previous detected
+	* devices the function will return the previously observed device class. 
+	*
+	* To determine which devices exist on the system, just loop from 0 to k_unMaxTrackedDeviceCount and check
+	* the device class. Every device with something other than TrackedDevice_Invalid is associated with an 
+	* actual tracked device. */
+	virtual ETrackedDeviceClass GetTrackedDeviceClass( vr::TrackedDeviceIndex_t unDeviceIndex ) = 0;
+
+	/** Returns true if there is a device connected in this slot. */
+	virtual bool IsTrackedDeviceConnected( vr::TrackedDeviceIndex_t unDeviceIndex ) = 0;
+
+	/** Returns a bool property. If the device index is not valid or the property is not a bool type this function will return false. */
+	virtual bool GetBoolTrackedDeviceProperty( vr::TrackedDeviceIndex_t unDeviceIndex, ETrackedDeviceProperty prop, ETrackedPropertyError *pError = 0L ) = 0;
+
+	/** Returns a float property. If the device index is not valid or the property is not a float type this function will return 0. */
+	virtual float GetFloatTrackedDeviceProperty( vr::TrackedDeviceIndex_t unDeviceIndex, ETrackedDeviceProperty prop, ETrackedPropertyError *pError = 0L ) = 0;
+
+	/** Returns an int property. If the device index is not valid or the property is not a int type this function will return 0. */
+	virtual int32_t GetInt32TrackedDeviceProperty( vr::TrackedDeviceIndex_t unDeviceIndex, ETrackedDeviceProperty prop, ETrackedPropertyError *pError = 0L ) = 0;
+
+	/** Returns a uint64 property. If the device index is not valid or the property is not a uint64 type this function will return 0. */
+	virtual uint64_t GetUint64TrackedDeviceProperty( vr::TrackedDeviceIndex_t unDeviceIndex, ETrackedDeviceProperty prop, ETrackedPropertyError *pError = 0L ) = 0;
+
+	/** Returns a matrix property. If the device index is not valid or the property is not a matrix type, this function will return identity. */
+	virtual HmdMatrix34_t GetMatrix34TrackedDeviceProperty( vr::TrackedDeviceIndex_t unDeviceIndex, ETrackedDeviceProperty prop, ETrackedPropertyError *pError = 0L ) = 0;
+	
+	/** Returns an array of one type of property. If the device index is not valid or the property is not a single value or an array of the specified type,
+	* this function will return 0. Otherwise it returns the number of bytes necessary to hold the array of properties. If unBufferSize is
+	* greater than the returned size and pBuffer is non-NULL, pBuffer is filled with the contents of array of properties. */
+	virtual uint32_t GetArrayTrackedDeviceProperty( vr::TrackedDeviceIndex_t unDeviceIndex, ETrackedDeviceProperty prop, PropertyTypeTag_t propType, void *pBuffer, uint32_t unBufferSize, ETrackedPropertyError *pError = 0L ) = 0;
+
+	/** Returns a string property. If the device index is not valid or the property is not a string type this function will 
+	* return 0. Otherwise it returns the length of the number of bytes necessary to hold this string including the trailing
+	* null. Strings will always fit in buffers of k_unMaxPropertyStringSize characters. */
+	virtual uint32_t GetStringTrackedDeviceProperty( vr::TrackedDeviceIndex_t unDeviceIndex, ETrackedDeviceProperty prop, VR_OUT_STRING() char *pchValue, uint32_t unBufferSize, ETrackedPropertyError *pError = 0L ) = 0;
+
+	/** returns a string that corresponds with the specified property error. The string will be the name 
+	* of the error enum value for all valid error codes */
+	virtual const char *GetPropErrorNameFromEnum( ETrackedPropertyError error ) = 0;
+
+	// ------------------------------------
+	// Event methods
+	// ------------------------------------
+
+	/** Returns true and fills the event with the next event on the queue if there is one. If there are no events
+	* this method returns false. uncbVREvent should be the size in bytes of the VREvent_t struct */
+	virtual bool PollNextEvent( VREvent_t *pEvent, uint32_t uncbVREvent ) = 0;
+
+	/** Returns true and fills the event with the next event on the queue if there is one. If there are no events
+	* this method returns false. Fills in the pose of the associated tracked device in the provided pose struct. 
+	* This pose will always be older than the call to this function and should not be used to render the device. 
+	uncbVREvent should be the size in bytes of the VREvent_t struct */
+	virtual bool PollNextEventWithPose( ETrackingUniverseOrigin eOrigin, VREvent_t *pEvent, uint32_t uncbVREvent, vr::TrackedDevicePose_t *pTrackedDevicePose ) = 0;
+
+	/** returns the name of an EVREvent enum value */
+	virtual const char *GetEventTypeNameFromEnum( EVREventType eType ) = 0;
+
+	// ------------------------------------
+	// Rendering helper methods
+	// ------------------------------------
+
+	/** Returns the hidden area mesh for the current HMD. The pixels covered by this mesh will never be seen by the user after the lens distortion is
+	* applied based on visibility to the panels. If this HMD does not have a hidden area mesh, the vertex data and count will be NULL and 0 respectively.
+	* This mesh is meant to be rendered into the stencil buffer (or into the depth buffer setting nearz) before rendering each eye's view. 
+	* This will improve performance by letting the GPU early-reject pixels the user will never see before running the pixel shader.
+	* NOTE: Render this mesh with backface culling disabled since the winding order of the vertices can be different per-HMD or per-eye.
+	* Setting the bInverse argument to true will produce the visible area mesh that is commonly used in place of full-screen quads. The visible area mesh covers all of the pixels the hidden area mesh does not cover.
+	* Setting the bLineLoop argument will return a line loop of vertices in HiddenAreaMesh_t->pVertexData with HiddenAreaMesh_t->unTriangleCount set to the number of vertices.
+	*/
+	virtual HiddenAreaMesh_t GetHiddenAreaMesh( EVREye eEye, EHiddenAreaMeshType type = k_eHiddenAreaMesh_Standard ) = 0;
+
+	// ------------------------------------
+	// Controller methods
+	// ------------------------------------
+
+	/** Fills the supplied struct with the current state of the controller. Returns false if the controller index
+	* is invalid. */
+	virtual bool GetControllerState( vr::TrackedDeviceIndex_t unControllerDeviceIndex, vr::VRControllerState_t *pControllerState, uint32_t unControllerStateSize ) = 0;
+
+	/** fills the supplied struct with the current state of the controller and the provided pose with the pose of 
+	* the controller when the controller state was updated most recently. Use this form if you need a precise controller
+	* pose as input to your application when the user presses or releases a button. */
+	virtual bool GetControllerStateWithPose( ETrackingUniverseOrigin eOrigin, vr::TrackedDeviceIndex_t unControllerDeviceIndex, vr::VRControllerState_t *pControllerState, uint32_t unControllerStateSize, TrackedDevicePose_t *pTrackedDevicePose ) = 0;
+
+	/** Trigger a single haptic pulse on a controller. After this call the application may not trigger another haptic pulse on this controller
+	* and axis combination for 5ms. */
+	virtual void TriggerHapticPulse( vr::TrackedDeviceIndex_t unControllerDeviceIndex, uint32_t unAxisId, unsigned short usDurationMicroSec ) = 0;
+
+	/** returns the name of an EVRButtonId enum value */
+	virtual const char *GetButtonIdNameFromEnum( EVRButtonId eButtonId ) = 0;
+
+	/** returns the name of an EVRControllerAxisType enum value */
+	virtual const char *GetControllerAxisTypeNameFromEnum( EVRControllerAxisType eAxisType ) = 0;
+
+	/** Returns true if this application is receiving input from the system. This would return false if 
+	* system-related functionality is consuming the input stream. */
+	virtual bool IsInputAvailable() = 0;
+
+	/** Returns true SteamVR is drawing controllers on top of the application. Applications should consider
+	* not drawing anything attached to the user's hands in this case. */
+	virtual bool IsSteamVRDrawingControllers() = 0;
+
+	/** Returns true if the user has put SteamVR into a mode that is distracting them from the application.
+	* For applications where this is appropriate, the application should pause ongoing activity. */
+	virtual bool ShouldApplicationPause() = 0;
+
+	/** Returns true if SteamVR is doing significant rendering work and the game should do what it can to reduce
+	* its own workload. One common way to do this is to reduce the size of the render target provided for each eye. */
+	virtual bool ShouldApplicationReduceRenderingWork() = 0;
+
+	// ------------------------------------
+	// Debug Methods
+	// ------------------------------------
+
+	/** Sends a request to the driver for the specified device and returns the response. The maximum response size is 32k,
+	* but this method can be called with a smaller buffer. If the response exceeds the size of the buffer, it is truncated. 
+	* The size of the response including its terminating null is returned. */
+	virtual uint32_t DriverDebugRequest( vr::TrackedDeviceIndex_t unDeviceIndex, const char *pchRequest, VR_OUT_STRING() char *pchResponseBuffer, uint32_t unResponseBufferSize ) = 0;
+
+	// ------------------------------------
+	// Firmware methods
+	// ------------------------------------
+	
+	/** Performs the actual firmware update if applicable. 
+	 * The following events will be sent, if VRFirmwareError_None was returned: VREvent_FirmwareUpdateStarted, VREvent_FirmwareUpdateFinished 
+	 * Use the properties Prop_Firmware_UpdateAvailable_Bool, Prop_Firmware_ManualUpdate_Bool, and Prop_Firmware_ManualUpdateURL_String
+	 * to figure our whether a firmware update is available, and to figure out whether its a manual update 
+	 * Prop_Firmware_ManualUpdateURL_String should point to an URL describing the manual update process */
+	virtual vr::EVRFirmwareError PerformFirmwareUpdate( vr::TrackedDeviceIndex_t unDeviceIndex ) = 0;
+
+	// ------------------------------------
+	// Application life cycle methods
+	// ------------------------------------
+
+	/** Call this to acknowledge to the system that VREvent_Quit has been received and that the process is exiting.
+	* This extends the timeout until the process is killed. */
+	virtual void AcknowledgeQuit_Exiting() = 0;
+
+	/** Call this to tell the system that the user is being prompted to save data. This
+	* halts the timeout and dismisses the dashboard (if it was up). Applications should be sure to actually 
+	* prompt the user to save and then exit afterward, otherwise the user will be left in a confusing state. */
+	virtual void AcknowledgeQuit_UserPrompt() = 0;
+
+};
+
+static const char * const IVRSystem_Version = "IVRSystem_019";
+
+}
+
+
+// ivrapplications.h
+namespace vr
+{
+
+	/** Used for all errors reported by the IVRApplications interface */
+	enum EVRApplicationError
+	{
+		VRApplicationError_None = 0,
+
+		VRApplicationError_AppKeyAlreadyExists = 100,	// Only one application can use any given key
+		VRApplicationError_NoManifest = 101,			// the running application does not have a manifest
+		VRApplicationError_NoApplication = 102,			// No application is running
+		VRApplicationError_InvalidIndex = 103,
+		VRApplicationError_UnknownApplication = 104,	// the application could not be found
+		VRApplicationError_IPCFailed = 105,				// An IPC failure caused the request to fail
+		VRApplicationError_ApplicationAlreadyRunning = 106, 
+		VRApplicationError_InvalidManifest = 107,
+		VRApplicationError_InvalidApplication = 108,
+		VRApplicationError_LaunchFailed = 109,			// the process didn't start
+		VRApplicationError_ApplicationAlreadyStarting = 110, // the system was already starting the same application
+		VRApplicationError_LaunchInProgress = 111,		// The system was already starting a different application
+		VRApplicationError_OldApplicationQuitting = 112, 
+		VRApplicationError_TransitionAborted = 113,
+		VRApplicationError_IsTemplate = 114, // error when you try to call LaunchApplication() on a template type app (use LaunchTemplateApplication)
+		VRApplicationError_SteamVRIsExiting = 115,
+
+		VRApplicationError_BufferTooSmall = 200,		// The provided buffer was too small to fit the requested data
+		VRApplicationError_PropertyNotSet = 201,		// The requested property was not set
+		VRApplicationError_UnknownProperty = 202,
+		VRApplicationError_InvalidParameter = 203,
+	};
+
+	/** The maximum length of an application key */
+	static const uint32_t k_unMaxApplicationKeyLength = 128;
+
+	/** these are the properties available on applications. */
+	enum EVRApplicationProperty
+	{
+		VRApplicationProperty_Name_String				= 0,
+
+		VRApplicationProperty_LaunchType_String			= 11,
+		VRApplicationProperty_WorkingDirectory_String	= 12,
+		VRApplicationProperty_BinaryPath_String			= 13,
+		VRApplicationProperty_Arguments_String			= 14,
+		VRApplicationProperty_URL_String				= 15,
+
+		VRApplicationProperty_Description_String		= 50,
+		VRApplicationProperty_NewsURL_String			= 51,
+		VRApplicationProperty_ImagePath_String			= 52,
+		VRApplicationProperty_Source_String				= 53,
+		VRApplicationProperty_ActionManifestURL_String	= 54,
+
+		VRApplicationProperty_IsDashboardOverlay_Bool	= 60,
+		VRApplicationProperty_IsTemplate_Bool			= 61,
+		VRApplicationProperty_IsInstanced_Bool			= 62,
+		VRApplicationProperty_IsInternal_Bool			= 63,
+		VRApplicationProperty_WantsCompositorPauseInStandby_Bool = 64,
+
+		VRApplicationProperty_LastLaunchTime_Uint64		= 70,
+	};
+
+	/** These are states the scene application startup process will go through. */
+	enum EVRApplicationTransitionState
+	{
+		VRApplicationTransition_None = 0,
+
+		VRApplicationTransition_OldAppQuitSent = 10,
+		VRApplicationTransition_WaitingForExternalLaunch = 11,
+		
+		VRApplicationTransition_NewAppLaunched = 20,
+	};
+
+	struct AppOverrideKeys_t
+	{
+		const char *pchKey;
+		const char *pchValue;
+	};
+
+	/** Currently recognized mime types */
+	static const char * const k_pch_MimeType_HomeApp		= "vr/home";
+	static const char * const k_pch_MimeType_GameTheater	= "vr/game_theater";
+
+	class IVRApplications
+	{
+	public:
+
+		// ---------------  Application management  --------------- //
+
+		/** Adds an application manifest to the list to load when building the list of installed applications. 
+		* Temporary manifests are not automatically loaded */
+		virtual EVRApplicationError AddApplicationManifest( const char *pchApplicationManifestFullPath, bool bTemporary = false ) = 0;
+
+		/** Removes an application manifest from the list to load when building the list of installed applications. */
+		virtual EVRApplicationError RemoveApplicationManifest( const char *pchApplicationManifestFullPath ) = 0;
+
+		/** Returns true if an application is installed */
+		virtual bool IsApplicationInstalled( const char *pchAppKey ) = 0;
+
+		/** Returns the number of applications available in the list */
+		virtual uint32_t GetApplicationCount() = 0;
+
+		/** Returns the key of the specified application. The index is at least 0 and is less than the return 
+		* value of GetApplicationCount(). The buffer should be at least k_unMaxApplicationKeyLength in order to 
+		* fit the key. */
+		virtual EVRApplicationError GetApplicationKeyByIndex( uint32_t unApplicationIndex, VR_OUT_STRING() char *pchAppKeyBuffer, uint32_t unAppKeyBufferLen ) = 0;
+
+		/** Returns the key of the application for the specified Process Id. The buffer should be at least 
+		* k_unMaxApplicationKeyLength in order to fit the key. */
+		virtual EVRApplicationError GetApplicationKeyByProcessId( uint32_t unProcessId, VR_OUT_STRING() char *pchAppKeyBuffer, uint32_t unAppKeyBufferLen ) = 0;
+
+		/** Launches the application. The existing scene application will exit and then the new application will start.
+		* This call is not valid for dashboard overlay applications. */
+		virtual EVRApplicationError LaunchApplication( const char *pchAppKey ) = 0;
+
+		/** Launches an instance of an application of type template, with its app key being pchNewAppKey (which must be unique) and optionally override sections
+		* from the manifest file via AppOverrideKeys_t
+		*/
+		virtual EVRApplicationError LaunchTemplateApplication( const char *pchTemplateAppKey, const char *pchNewAppKey, VR_ARRAY_COUNT( unKeys ) const AppOverrideKeys_t *pKeys, uint32_t unKeys ) = 0;
+
+		/** launches the application currently associated with this mime type and passes it the option args, typically the filename or object name of the item being launched */
+		virtual vr::EVRApplicationError LaunchApplicationFromMimeType( const char *pchMimeType, const char *pchArgs ) = 0;
+
+		/** Launches the dashboard overlay application if it is not already running. This call is only valid for 
+		* dashboard overlay applications. */
+		virtual EVRApplicationError LaunchDashboardOverlay( const char *pchAppKey ) = 0;
+
+		/** Cancel a pending launch for an application */
+		virtual bool CancelApplicationLaunch( const char *pchAppKey ) = 0;
+
+		/** Identifies a running application. OpenVR can't always tell which process started in response
+		* to a URL. This function allows a URL handler (or the process itself) to identify the app key 
+		* for the now running application. Passing a process ID of 0 identifies the calling process. 
+		* The application must be one that's known to the system via a call to AddApplicationManifest. */
+		virtual EVRApplicationError IdentifyApplication( uint32_t unProcessId, const char *pchAppKey ) = 0;
+
+		/** Returns the process ID for an application. Return 0 if the application was not found or is not running. */
+		virtual uint32_t GetApplicationProcessId( const char *pchAppKey ) = 0;
+
+		/** Returns a string for an applications error */
+		virtual const char *GetApplicationsErrorNameFromEnum( EVRApplicationError error ) = 0;
+
+		// ---------------  Application properties  --------------- //
+
+		/** Returns a value for an application property. The required buffer size to fit this value will be returned. */
+		virtual uint32_t GetApplicationPropertyString( const char *pchAppKey, EVRApplicationProperty eProperty, VR_OUT_STRING() char *pchPropertyValueBuffer, uint32_t unPropertyValueBufferLen, EVRApplicationError *peError = nullptr ) = 0;
+
+		/** Returns a bool value for an application property. Returns false in all error cases. */
+		virtual bool GetApplicationPropertyBool( const char *pchAppKey, EVRApplicationProperty eProperty, EVRApplicationError *peError = nullptr ) = 0;
+
+		/** Returns a uint64 value for an application property. Returns 0 in all error cases. */
+		virtual uint64_t GetApplicationPropertyUint64( const char *pchAppKey, EVRApplicationProperty eProperty, EVRApplicationError *peError = nullptr ) = 0;
+
+		/** Sets the application auto-launch flag. This is only valid for applications which return true for VRApplicationProperty_IsDashboardOverlay_Bool. */
+		virtual EVRApplicationError SetApplicationAutoLaunch( const char *pchAppKey, bool bAutoLaunch ) = 0;
+
+		/** Gets the application auto-launch flag. This is only valid for applications which return true for VRApplicationProperty_IsDashboardOverlay_Bool. */
+		virtual bool GetApplicationAutoLaunch( const char *pchAppKey ) = 0;
+
+		/** Adds this mime-type to the list of supported mime types for this application*/
+		virtual EVRApplicationError SetDefaultApplicationForMimeType( const char *pchAppKey, const char *pchMimeType ) = 0;
+
+		/** return the app key that will open this mime type */
+		virtual bool GetDefaultApplicationForMimeType( const char *pchMimeType, VR_OUT_STRING() char *pchAppKeyBuffer, uint32_t unAppKeyBufferLen ) = 0;
+
+		/** Get the list of supported mime types for this application, comma-delimited */
+		virtual bool GetApplicationSupportedMimeTypes( const char *pchAppKey, VR_OUT_STRING() char *pchMimeTypesBuffer, uint32_t unMimeTypesBuffer ) = 0;
+
+		/** Get the list of app-keys that support this mime type, comma-delimited, the return value is number of bytes you need to return the full string */
+		virtual uint32_t GetApplicationsThatSupportMimeType( const char *pchMimeType, VR_OUT_STRING() char *pchAppKeysThatSupportBuffer, uint32_t unAppKeysThatSupportBuffer ) = 0;
+
+		/** Get the args list from an app launch that had the process already running, you call this when you get a VREvent_ApplicationMimeTypeLoad */
+		virtual uint32_t GetApplicationLaunchArguments( uint32_t unHandle, VR_OUT_STRING() char *pchArgs, uint32_t unArgs ) = 0;
+
+		// ---------------  Transition methods --------------- //
+
+		/** Returns the app key for the application that is starting up */
+		virtual EVRApplicationError GetStartingApplication( VR_OUT_STRING() char *pchAppKeyBuffer, uint32_t unAppKeyBufferLen ) = 0;
+
+		/** Returns the application transition state */
+		virtual EVRApplicationTransitionState GetTransitionState() = 0;
+
+		/** Returns errors that would prevent the specified application from launching immediately. Calling this function will
+		* cause the current scene application to quit, so only call it when you are actually about to launch something else.
+		* What the caller should do about these failures depends on the failure:
+		*   VRApplicationError_OldApplicationQuitting - An existing application has been told to quit. Wait for a VREvent_ProcessQuit
+		*                                               and try again.
+		*   VRApplicationError_ApplicationAlreadyStarting - This application is already starting. This is a permanent failure.
+		*   VRApplicationError_LaunchInProgress	      - A different application is already starting. This is a permanent failure.
+		*   VRApplicationError_None                   - Go ahead and launch. Everything is clear.
+		*/
+		virtual EVRApplicationError PerformApplicationPrelaunchCheck( const char *pchAppKey ) = 0;
+
+		/** Returns a string for an application transition state */
+		virtual const char *GetApplicationsTransitionStateNameFromEnum( EVRApplicationTransitionState state ) = 0;
+
+		/** Returns true if the outgoing scene app has requested a save prompt before exiting */
+		virtual bool IsQuitUserPromptRequested() = 0;
+
+		/** Starts a subprocess within the calling application. This
+		* suppresses all application transition UI and automatically identifies the new executable 
+		* as part of the same application. On success the calling process should exit immediately. 
+		* If working directory is NULL or "" the directory portion of the binary path will be 
+		* the working directory. */
+		virtual EVRApplicationError LaunchInternalProcess( const char *pchBinaryPath, const char *pchArguments, const char *pchWorkingDirectory ) = 0;
+
+		/** Returns the current scene process ID according to the application system. A scene process will get scene
+		* focus once it starts rendering, but it will appear here once it calls VR_Init with the Scene application
+		* type. */
+		virtual uint32_t GetCurrentSceneProcessId() = 0;
+	};
+
+	static const char * const IVRApplications_Version = "IVRApplications_006";
+
+} // namespace vr
+
+// ivrsettings.h
+namespace vr
+{
+	enum EVRSettingsError
+	{
+		VRSettingsError_None = 0,
+		VRSettingsError_IPCFailed = 1,
+		VRSettingsError_WriteFailed = 2,
+		VRSettingsError_ReadFailed = 3,
+		VRSettingsError_JsonParseFailed = 4,
+		VRSettingsError_UnsetSettingHasNoDefault = 5, // This will be returned if the setting does not appear in the appropriate default file and has not been set
+	};
+
+	// The maximum length of a settings key
+	static const uint32_t k_unMaxSettingsKeyLength = 128;
+
+	class IVRSettings
+	{
+	public:
+		virtual const char *GetSettingsErrorNameFromEnum( EVRSettingsError eError ) = 0;
+
+		// Returns true if file sync occurred (force or settings dirty)
+		virtual bool Sync( bool bForce = false, EVRSettingsError *peError = nullptr ) = 0;
+
+		virtual void SetBool( const char *pchSection, const char *pchSettingsKey, bool bValue, EVRSettingsError *peError = nullptr ) = 0;
+		virtual void SetInt32( const char *pchSection, const char *pchSettingsKey, int32_t nValue, EVRSettingsError *peError = nullptr ) = 0;
+		virtual void SetFloat( const char *pchSection, const char *pchSettingsKey, float flValue, EVRSettingsError *peError = nullptr ) = 0;
+		virtual void SetString( const char *pchSection, const char *pchSettingsKey, const char *pchValue, EVRSettingsError *peError = nullptr ) = 0;
+
+		// Users of the system need to provide a proper default in default.vrsettings in the resources/settings/ directory
+		// of either the runtime or the driver_xxx directory. Otherwise the default will be false, 0, 0.0 or ""
+		virtual bool GetBool( const char *pchSection, const char *pchSettingsKey, EVRSettingsError *peError = nullptr ) = 0;
+		virtual int32_t GetInt32( const char *pchSection, const char *pchSettingsKey, EVRSettingsError *peError = nullptr ) = 0;
+		virtual float GetFloat( const char *pchSection, const char *pchSettingsKey, EVRSettingsError *peError = nullptr ) = 0;
+		virtual void GetString( const char *pchSection, const char *pchSettingsKey, VR_OUT_STRING() char *pchValue, uint32_t unValueLen, EVRSettingsError *peError = nullptr ) = 0;
+
+		virtual void RemoveSection( const char *pchSection, EVRSettingsError *peError = nullptr ) = 0;
+		virtual void RemoveKeyInSection( const char *pchSection, const char *pchSettingsKey, EVRSettingsError *peError = nullptr ) = 0;
+	};
+
+	//-----------------------------------------------------------------------------
+	static const char * const IVRSettings_Version = "IVRSettings_002";
+
+	//-----------------------------------------------------------------------------
+	// steamvr keys
+	static const char * const k_pch_SteamVR_Section = "steamvr";
+	static const char * const k_pch_SteamVR_RequireHmd_String = "requireHmd";
+	static const char * const k_pch_SteamVR_ForcedDriverKey_String = "forcedDriver";
+	static const char * const k_pch_SteamVR_ForcedHmdKey_String = "forcedHmd";
+	static const char * const k_pch_SteamVR_DisplayDebug_Bool = "displayDebug";
+	static const char * const k_pch_SteamVR_DebugProcessPipe_String = "debugProcessPipe";
+	static const char * const k_pch_SteamVR_DisplayDebugX_Int32 = "displayDebugX";
+	static const char * const k_pch_SteamVR_DisplayDebugY_Int32 = "displayDebugY";
+	static const char * const k_pch_SteamVR_SendSystemButtonToAllApps_Bool= "sendSystemButtonToAllApps";
+	static const char * const k_pch_SteamVR_LogLevel_Int32 = "loglevel";
+	static const char * const k_pch_SteamVR_IPD_Float = "ipd";
+	static const char * const k_pch_SteamVR_Background_String = "background";
+	static const char * const k_pch_SteamVR_BackgroundUseDomeProjection_Bool = "backgroundUseDomeProjection";
+	static const char * const k_pch_SteamVR_BackgroundCameraHeight_Float = "backgroundCameraHeight";
+	static const char * const k_pch_SteamVR_BackgroundDomeRadius_Float = "backgroundDomeRadius";
+	static const char * const k_pch_SteamVR_GridColor_String = "gridColor";
+	static const char * const k_pch_SteamVR_PlayAreaColor_String = "playAreaColor";
+	static const char * const k_pch_SteamVR_ShowStage_Bool = "showStage";
+	static const char * const k_pch_SteamVR_ActivateMultipleDrivers_Bool = "activateMultipleDrivers";
+	static const char * const k_pch_SteamVR_DirectMode_Bool = "directMode";
+	static const char * const k_pch_SteamVR_DirectModeEdidVid_Int32 = "directModeEdidVid";
+	static const char * const k_pch_SteamVR_DirectModeEdidPid_Int32 = "directModeEdidPid";
+	static const char * const k_pch_SteamVR_UsingSpeakers_Bool = "usingSpeakers";
+	static const char * const k_pch_SteamVR_SpeakersForwardYawOffsetDegrees_Float = "speakersForwardYawOffsetDegrees";
+	static const char * const k_pch_SteamVR_BaseStationPowerManagement_Bool = "basestationPowerManagement";
+	static const char * const k_pch_SteamVR_NeverKillProcesses_Bool = "neverKillProcesses";
+	static const char * const k_pch_SteamVR_SupersampleScale_Float = "supersampleScale";
+	static const char * const k_pch_SteamVR_AllowAsyncReprojection_Bool = "allowAsyncReprojection";
+	static const char * const k_pch_SteamVR_AllowReprojection_Bool = "allowInterleavedReprojection";
+	static const char * const k_pch_SteamVR_ForceReprojection_Bool = "forceReprojection";
+	static const char * const k_pch_SteamVR_ForceFadeOnBadTracking_Bool = "forceFadeOnBadTracking";
+	static const char * const k_pch_SteamVR_DefaultMirrorView_Int32 = "defaultMirrorView";
+	static const char * const k_pch_SteamVR_ShowMirrorView_Bool = "showMirrorView";
+	static const char * const k_pch_SteamVR_MirrorViewGeometry_String = "mirrorViewGeometry";
+	static const char * const k_pch_SteamVR_StartMonitorFromAppLaunch = "startMonitorFromAppLaunch";
+	static const char * const k_pch_SteamVR_StartCompositorFromAppLaunch_Bool = "startCompositorFromAppLaunch";
+	static const char * const k_pch_SteamVR_StartDashboardFromAppLaunch_Bool = "startDashboardFromAppLaunch";
+	static const char * const k_pch_SteamVR_StartOverlayAppsFromDashboard_Bool = "startOverlayAppsFromDashboard";
+	static const char * const k_pch_SteamVR_EnableHomeApp = "enableHomeApp";
+	static const char * const k_pch_SteamVR_CycleBackgroundImageTimeSec_Int32 = "CycleBackgroundImageTimeSec";
+	static const char * const k_pch_SteamVR_RetailDemo_Bool = "retailDemo";
+	static const char * const k_pch_SteamVR_IpdOffset_Float = "ipdOffset";
+	static const char * const k_pch_SteamVR_AllowSupersampleFiltering_Bool = "allowSupersampleFiltering";
+	static const char * const k_pch_SteamVR_SupersampleManualOverride_Bool = "supersampleManualOverride";
+	static const char * const k_pch_SteamVR_EnableLinuxVulkanAsync_Bool = "enableLinuxVulkanAsync";
+	static const char * const k_pch_SteamVR_AllowDisplayLockedMode_Bool = "allowDisplayLockedMode";
+	static const char * const k_pch_SteamVR_HaveStartedTutorialForNativeChaperoneDriver_Bool = "haveStartedTutorialForNativeChaperoneDriver";
+	static const char * const k_pch_SteamVR_ForceWindows32bitVRMonitor = "forceWindows32BitVRMonitor";
+	static const char * const k_pch_SteamVR_DebugInput = "debugInput";
+	static const char * const k_pch_SteamVR_LegacyInputRebinding = "legacyInputRebinding";
+	static const char * const k_pch_SteamVR_DebugInputBinding = "debugInputBinding";
+
+	//-----------------------------------------------------------------------------
+	// lighthouse keys
+	static const char * const k_pch_Lighthouse_Section = "driver_lighthouse";
+	static const char * const k_pch_Lighthouse_DisableIMU_Bool = "disableimu";
+	static const char * const k_pch_Lighthouse_DisableIMUExceptHMD_Bool = "disableimuexcepthmd";
+	static const char * const k_pch_Lighthouse_UseDisambiguation_String = "usedisambiguation";
+	static const char * const k_pch_Lighthouse_DisambiguationDebug_Int32 = "disambiguationdebug";
+	static const char * const k_pch_Lighthouse_PrimaryBasestation_Int32 = "primarybasestation";
+	static const char * const k_pch_Lighthouse_DBHistory_Bool = "dbhistory";
+	static const char * const k_pch_Lighthouse_EnableBluetooth_Bool = "enableBluetooth";
+	static const char * const k_pch_Lighthouse_PowerManagedBaseStations_String = "PowerManagedBaseStations";
+
+	//-----------------------------------------------------------------------------
+	// null keys
+	static const char * const k_pch_Null_Section = "driver_null";
+	static const char * const k_pch_Null_SerialNumber_String = "serialNumber";
+	static const char * const k_pch_Null_ModelNumber_String = "modelNumber";
+	static const char * const k_pch_Null_WindowX_Int32 = "windowX";
+	static const char * const k_pch_Null_WindowY_Int32 = "windowY";
+	static const char * const k_pch_Null_WindowWidth_Int32 = "windowWidth";
+	static const char * const k_pch_Null_WindowHeight_Int32 = "windowHeight";
+	static const char * const k_pch_Null_RenderWidth_Int32 = "renderWidth";
+	static const char * const k_pch_Null_RenderHeight_Int32 = "renderHeight";
+	static const char * const k_pch_Null_SecondsFromVsyncToPhotons_Float = "secondsFromVsyncToPhotons";
+	static const char * const k_pch_Null_DisplayFrequency_Float = "displayFrequency";
+
+	//-----------------------------------------------------------------------------
+	// user interface keys
+	static const char * const k_pch_UserInterface_Section = "userinterface";
+	static const char * const k_pch_UserInterface_StatusAlwaysOnTop_Bool = "StatusAlwaysOnTop";
+	static const char * const k_pch_UserInterface_MinimizeToTray_Bool = "MinimizeToTray";
+	static const char * const k_pch_UserInterface_Screenshots_Bool = "screenshots";
+	static const char * const k_pch_UserInterface_ScreenshotType_Int = "screenshotType";
+
+	//-----------------------------------------------------------------------------
+	// notification keys
+	static const char * const k_pch_Notifications_Section = "notifications";
+	static const char * const k_pch_Notifications_DoNotDisturb_Bool = "DoNotDisturb";
+
+	//-----------------------------------------------------------------------------
+	// keyboard keys
+	static const char * const k_pch_Keyboard_Section = "keyboard";
+	static const char * const k_pch_Keyboard_TutorialCompletions = "TutorialCompletions";
+	static const char * const k_pch_Keyboard_ScaleX = "ScaleX";
+	static const char * const k_pch_Keyboard_ScaleY = "ScaleY";
+	static const char * const k_pch_Keyboard_OffsetLeftX = "OffsetLeftX";
+	static const char * const k_pch_Keyboard_OffsetRightX = "OffsetRightX";
+	static const char * const k_pch_Keyboard_OffsetY = "OffsetY";
+	static const char * const k_pch_Keyboard_Smoothing = "Smoothing";
+
+	//-----------------------------------------------------------------------------
+	// perf keys
+	static const char * const k_pch_Perf_Section = "perfcheck";
+	static const char * const k_pch_Perf_HeuristicActive_Bool = "heuristicActive";
+	static const char * const k_pch_Perf_NotifyInHMD_Bool = "warnInHMD";
+	static const char * const k_pch_Perf_NotifyOnlyOnce_Bool = "warnOnlyOnce";
+	static const char * const k_pch_Perf_AllowTimingStore_Bool = "allowTimingStore";
+	static const char * const k_pch_Perf_SaveTimingsOnExit_Bool = "saveTimingsOnExit";
+	static const char * const k_pch_Perf_TestData_Float = "perfTestData";
+	static const char * const k_pch_Perf_LinuxGPUProfiling_Bool = "linuxGPUProfiling";
+
+	//-----------------------------------------------------------------------------
+	// collision bounds keys
+	static const char * const k_pch_CollisionBounds_Section = "collisionBounds";
+	static const char * const k_pch_CollisionBounds_Style_Int32 = "CollisionBoundsStyle";
+	static const char * const k_pch_CollisionBounds_GroundPerimeterOn_Bool = "CollisionBoundsGroundPerimeterOn";
+	static const char * const k_pch_CollisionBounds_CenterMarkerOn_Bool = "CollisionBoundsCenterMarkerOn";
+	static const char * const k_pch_CollisionBounds_PlaySpaceOn_Bool = "CollisionBoundsPlaySpaceOn";
+	static const char * const k_pch_CollisionBounds_FadeDistance_Float = "CollisionBoundsFadeDistance";
+	static const char * const k_pch_CollisionBounds_ColorGammaR_Int32 = "CollisionBoundsColorGammaR";
+	static const char * const k_pch_CollisionBounds_ColorGammaG_Int32 = "CollisionBoundsColorGammaG";
+	static const char * const k_pch_CollisionBounds_ColorGammaB_Int32 = "CollisionBoundsColorGammaB";
+	static const char * const k_pch_CollisionBounds_ColorGammaA_Int32 = "CollisionBoundsColorGammaA";
+
+	//-----------------------------------------------------------------------------
+	// camera keys
+	static const char * const k_pch_Camera_Section = "camera";
+	static const char * const k_pch_Camera_EnableCamera_Bool = "enableCamera";
+	static const char * const k_pch_Camera_EnableCameraInDashboard_Bool = "enableCameraInDashboard";
+	static const char * const k_pch_Camera_EnableCameraForCollisionBounds_Bool = "enableCameraForCollisionBounds";
+	static const char * const k_pch_Camera_EnableCameraForRoomView_Bool = "enableCameraForRoomView";
+	static const char * const k_pch_Camera_BoundsColorGammaR_Int32 = "cameraBoundsColorGammaR";
+	static const char * const k_pch_Camera_BoundsColorGammaG_Int32 = "cameraBoundsColorGammaG";
+	static const char * const k_pch_Camera_BoundsColorGammaB_Int32 = "cameraBoundsColorGammaB";
+	static const char * const k_pch_Camera_BoundsColorGammaA_Int32 = "cameraBoundsColorGammaA";
+	static const char * const k_pch_Camera_BoundsStrength_Int32 = "cameraBoundsStrength";
+	static const char * const k_pch_Camera_RoomViewMode_Int32 = "cameraRoomViewMode";
+
+	//-----------------------------------------------------------------------------
+	// audio keys
+	static const char * const k_pch_audio_Section = "audio";
+	static const char * const k_pch_audio_OnPlaybackDevice_String = "onPlaybackDevice";
+	static const char * const k_pch_audio_OnRecordDevice_String = "onRecordDevice";
+	static const char * const k_pch_audio_OnPlaybackMirrorDevice_String = "onPlaybackMirrorDevice";
+	static const char * const k_pch_audio_OffPlaybackDevice_String = "offPlaybackDevice";
+	static const char * const k_pch_audio_OffRecordDevice_String = "offRecordDevice";
+	static const char * const k_pch_audio_VIVEHDMIGain = "viveHDMIGain";
+
+	//-----------------------------------------------------------------------------
+	// power management keys
+	static const char * const k_pch_Power_Section = "power";
+	static const char * const k_pch_Power_PowerOffOnExit_Bool = "powerOffOnExit";
+	static const char * const k_pch_Power_TurnOffScreensTimeout_Float = "turnOffScreensTimeout";
+	static const char * const k_pch_Power_TurnOffControllersTimeout_Float = "turnOffControllersTimeout";
+	static const char * const k_pch_Power_ReturnToWatchdogTimeout_Float = "returnToWatchdogTimeout";
+	static const char * const k_pch_Power_AutoLaunchSteamVROnButtonPress = "autoLaunchSteamVROnButtonPress";
+	static const char * const k_pch_Power_PauseCompositorOnStandby_Bool = "pauseCompositorOnStandby";
+
+	//-----------------------------------------------------------------------------
+	// dashboard keys
+	static const char * const k_pch_Dashboard_Section = "dashboard";
+	static const char * const k_pch_Dashboard_EnableDashboard_Bool = "enableDashboard";
+	static const char * const k_pch_Dashboard_ArcadeMode_Bool = "arcadeMode";
+	static const char * const k_pch_Dashboard_EnableWebUI = "webUI";
+	static const char * const k_pch_Dashboard_EnableWebUIDevTools = "webUIDevTools";
+
+	//-----------------------------------------------------------------------------
+	// model skin keys
+	static const char * const k_pch_modelskin_Section = "modelskins";
+
+	//-----------------------------------------------------------------------------
+	// driver keys - These could be checked in any driver_<name> section
+	static const char * const k_pch_Driver_Enable_Bool = "enable";
+
+	//-----------------------------------------------------------------------------
+	// web interface keys
+	static const char* const k_pch_WebInterface_Section = "WebInterface";
+	static const char* const k_pch_WebInterface_WebPort_String = "WebPort";
+
+	//-----------------------------------------------------------------------------
+	// tracking overrides - keys are device paths, values are the device paths their
+	//  tracking/pose information overrides
+	static const char* const k_pch_TrackingOverride_Section = "TrackingOverrides";
+
+	//-----------------------------------------------------------------------------
+	// per-app keys - the section name for these is the app key itself. Some of these are prefixed by the controller type
+	static const char* const k_pch_App_BindingAutosaveURLSuffix_String = "AutosaveURL";
+	static const char* const k_pch_App_BindingCurrentURLSuffix_String = "CurrentURL";
+	static const char* const k_pch_App_NeedToUpdateAutosaveSuffix_Bool = "NeedToUpdateAutosave";
+	static const char* const k_pch_App_ActionManifestURL_String = "ActionManifestURL";
+
+} // namespace vr
+
+// ivrchaperone.h
+namespace vr
+{
+
+#pragma pack( push, 8 )
+
+enum ChaperoneCalibrationState
+{
+	// OK!
+	ChaperoneCalibrationState_OK = 1,									// Chaperone is fully calibrated and working correctly
+
+	// Warnings
+	ChaperoneCalibrationState_Warning = 100,
+	ChaperoneCalibrationState_Warning_BaseStationMayHaveMoved = 101,	// A base station thinks that it might have moved
+	ChaperoneCalibrationState_Warning_BaseStationRemoved = 102,			// There are less base stations than when calibrated
+	ChaperoneCalibrationState_Warning_SeatedBoundsInvalid = 103,		// Seated bounds haven't been calibrated for the current tracking center
+
+	// Errors
+	ChaperoneCalibrationState_Error = 200,								// The UniverseID is invalid
+	ChaperoneCalibrationState_Error_BaseStationUninitialized = 201,		// Tracking center hasn't be calibrated for at least one of the base stations
+	ChaperoneCalibrationState_Error_BaseStationConflict = 202,			// Tracking center is calibrated, but base stations disagree on the tracking space
+	ChaperoneCalibrationState_Error_PlayAreaInvalid = 203,				// Play Area hasn't been calibrated for the current tracking center
+	ChaperoneCalibrationState_Error_CollisionBoundsInvalid = 204,		// Collision Bounds haven't been calibrated for the current tracking center
+};
+
+
+/** HIGH LEVEL TRACKING SPACE ASSUMPTIONS:
+* 0,0,0 is the preferred standing area center.
+* 0Y is the floor height.
+* -Z is the preferred forward facing direction. */
+class IVRChaperone
+{
+public:
+
+	/** Get the current state of Chaperone calibration. This state can change at any time during a session due to physical base station changes. **/
+	virtual ChaperoneCalibrationState GetCalibrationState() = 0;
+
+	/** Returns the width and depth of the Play Area (formerly named Soft Bounds) in X and Z. 
+	* Tracking space center (0,0,0) is the center of the Play Area. **/
+	virtual bool GetPlayAreaSize( float *pSizeX, float *pSizeZ ) = 0;
+
+	/** Returns the 4 corner positions of the Play Area (formerly named Soft Bounds).
+	* Corners are in counter-clockwise order.
+	* Standing center (0,0,0) is the center of the Play Area.
+	* It's a rectangle.
+	* 2 sides are parallel to the X axis and 2 sides are parallel to the Z axis.
+	* Height of every corner is 0Y (on the floor). **/
+	virtual bool GetPlayAreaRect( HmdQuad_t *rect ) = 0;
+
+	/** Reload Chaperone data from the .vrchap file on disk. */
+	virtual void ReloadInfo( void ) = 0;
+
+	/** Optionally give the chaperone system a hit about the color and brightness in the scene **/
+	virtual void SetSceneColor( HmdColor_t color ) = 0;
+
+	/** Get the current chaperone bounds draw color and brightness **/
+	virtual void GetBoundsColor( HmdColor_t *pOutputColorArray, int nNumOutputColors, float flCollisionBoundsFadeDistance, HmdColor_t *pOutputCameraColor ) = 0;
+
+	/** Determine whether the bounds are showing right now **/
+	virtual bool AreBoundsVisible() = 0;
+
+	/** Force the bounds to show, mostly for utilities **/
+	virtual void ForceBoundsVisible( bool bForce ) = 0;
+};
+
+static const char * const IVRChaperone_Version = "IVRChaperone_003";
+
+#pragma pack( pop )
+
+}
+
+// ivrchaperonesetup.h
+namespace vr
+{
+
+enum EChaperoneConfigFile
+{
+	EChaperoneConfigFile_Live = 1,		// The live chaperone config, used by most applications and games
+	EChaperoneConfigFile_Temp = 2,		// The temporary chaperone config, used to live-preview collision bounds in room setup
+};
+
+enum EChaperoneImportFlags
+{
+	EChaperoneImport_BoundsOnly = 0x0001,
+};
+
+/** Manages the working copy of the chaperone info. By default this will be the same as the 
+* live copy. Any changes made with this interface will stay in the working copy until 
+* CommitWorkingCopy() is called, at which point the working copy and the live copy will be 
+* the same again. */
+class IVRChaperoneSetup
+{
+public:
+
+	/** Saves the current working copy to disk */
+	virtual bool CommitWorkingCopy( EChaperoneConfigFile configFile ) = 0;
+
+	/** Reverts the working copy to match the live chaperone calibration.
+	* To modify existing data this MUST be do WHILE getting a non-error ChaperoneCalibrationStatus.
+	* Only after this should you do gets and sets on the existing data. */
+	virtual void RevertWorkingCopy() = 0;
+
+	/** Returns the width and depth of the Play Area (formerly named Soft Bounds) in X and Z from the working copy.
+	* Tracking space center (0,0,0) is the center of the Play Area. */
+	virtual bool GetWorkingPlayAreaSize( float *pSizeX, float *pSizeZ ) = 0;
+
+	/** Returns the 4 corner positions of the Play Area (formerly named Soft Bounds) from the working copy.
+	* Corners are in clockwise order.
+	* Tracking space center (0,0,0) is the center of the Play Area.
+	* It's a rectangle.
+	* 2 sides are parallel to the X axis and 2 sides are parallel to the Z axis.
+	* Height of every corner is 0Y (on the floor). **/
+	virtual bool GetWorkingPlayAreaRect( HmdQuad_t *rect ) = 0;
+
+	/** Returns the number of Quads if the buffer points to null. Otherwise it returns Quads 
+	* into the buffer up to the max specified from the working copy. */
+	virtual bool GetWorkingCollisionBoundsInfo( VR_OUT_ARRAY_COUNT(punQuadsCount) HmdQuad_t *pQuadsBuffer, uint32_t* punQuadsCount ) = 0;
+
+	/** Returns the number of Quads if the buffer points to null. Otherwise it returns Quads 
+	* into the buffer up to the max specified. */
+	virtual bool GetLiveCollisionBoundsInfo( VR_OUT_ARRAY_COUNT(punQuadsCount) HmdQuad_t *pQuadsBuffer, uint32_t* punQuadsCount ) = 0;
+
+	/** Returns the preferred seated position from the working copy. */
+	virtual bool GetWorkingSeatedZeroPoseToRawTrackingPose( HmdMatrix34_t *pmatSeatedZeroPoseToRawTrackingPose ) = 0;
+
+	/** Returns the standing origin from the working copy. */
+	virtual bool GetWorkingStandingZeroPoseToRawTrackingPose( HmdMatrix34_t *pmatStandingZeroPoseToRawTrackingPose ) = 0;
+
+	/** Sets the Play Area in the working copy. */
+	virtual void SetWorkingPlayAreaSize( float sizeX, float sizeZ ) = 0;
+
+	/** Sets the Collision Bounds in the working copy. */
+	virtual void SetWorkingCollisionBoundsInfo( VR_ARRAY_COUNT(unQuadsCount) HmdQuad_t *pQuadsBuffer, uint32_t unQuadsCount ) = 0;
+
+	/** Sets the preferred seated position in the working copy. */
+	virtual void SetWorkingSeatedZeroPoseToRawTrackingPose( const HmdMatrix34_t *pMatSeatedZeroPoseToRawTrackingPose ) = 0;
+
+	/** Sets the preferred standing position in the working copy. */
+	virtual void SetWorkingStandingZeroPoseToRawTrackingPose( const HmdMatrix34_t *pMatStandingZeroPoseToRawTrackingPose ) = 0;
+
+	/** Tear everything down and reload it from the file on disk */
+	virtual void ReloadFromDisk( EChaperoneConfigFile configFile ) = 0;
+
+	/** Returns the preferred seated position. */
+	virtual bool GetLiveSeatedZeroPoseToRawTrackingPose( HmdMatrix34_t *pmatSeatedZeroPoseToRawTrackingPose ) = 0;
+
+	virtual void SetWorkingCollisionBoundsTagsInfo( VR_ARRAY_COUNT(unTagCount) uint8_t *pTagsBuffer, uint32_t unTagCount ) = 0;
+	virtual bool GetLiveCollisionBoundsTagsInfo( VR_OUT_ARRAY_COUNT(punTagCount) uint8_t *pTagsBuffer, uint32_t *punTagCount ) = 0;
+
+	virtual bool SetWorkingPhysicalBoundsInfo( VR_ARRAY_COUNT(unQuadsCount) HmdQuad_t *pQuadsBuffer, uint32_t unQuadsCount ) = 0;
+	virtual bool GetLivePhysicalBoundsInfo( VR_OUT_ARRAY_COUNT(punQuadsCount) HmdQuad_t *pQuadsBuffer, uint32_t* punQuadsCount ) = 0;
+
+	virtual bool ExportLiveToBuffer( VR_OUT_STRING() char *pBuffer, uint32_t *pnBufferLength ) = 0;
+	virtual bool ImportFromBufferToWorking( const char *pBuffer, uint32_t nImportFlags ) = 0;
+};
+
+static const char * const IVRChaperoneSetup_Version = "IVRChaperoneSetup_005";
+
+
+}
+
+// ivrcompositor.h
+namespace vr
+{
+
+#pragma pack( push, 8 )
+
+/** Errors that can occur with the VR compositor */
+enum EVRCompositorError
+{
+	VRCompositorError_None						= 0,
+	VRCompositorError_RequestFailed				= 1,
+	VRCompositorError_IncompatibleVersion		= 100,
+	VRCompositorError_DoNotHaveFocus			= 101,
+	VRCompositorError_InvalidTexture			= 102,
+	VRCompositorError_IsNotSceneApplication		= 103,
+	VRCompositorError_TextureIsOnWrongDevice	= 104,
+	VRCompositorError_TextureUsesUnsupportedFormat = 105,
+	VRCompositorError_SharedTexturesNotSupported = 106,
+	VRCompositorError_IndexOutOfRange			= 107,
+	VRCompositorError_AlreadySubmitted			= 108,
+	VRCompositorError_InvalidBounds				= 109,
+};
+
+/** Timing mode passed to SetExplicitTimingMode(); see that function for documentation */
+enum EVRCompositorTimingMode
+{
+	VRCompositorTimingMode_Implicit											= 0,
+	VRCompositorTimingMode_Explicit_RuntimePerformsPostPresentHandoff		= 1,
+	VRCompositorTimingMode_Explicit_ApplicationPerformsPostPresentHandoff	= 2,
+};
+
+const uint32_t VRCompositor_ReprojectionReason_Cpu = 0x01;
+const uint32_t VRCompositor_ReprojectionReason_Gpu = 0x02;
+const uint32_t VRCompositor_ReprojectionAsync      = 0x04;	// This flag indicates the async reprojection mode is active,
+															// but does not indicate if reprojection actually happened or not.
+															// Use the ReprojectionReason flags above to check if reprojection
+															// was actually applied (i.e. scene texture was reused).
+															// NumFramePresents > 1 also indicates the scene texture was reused,
+															// and also the number of times that it was presented in total.
+
+/** Provides a single frame's timing information to the app */
+struct Compositor_FrameTiming
+{
+	uint32_t m_nSize; // Set to sizeof( Compositor_FrameTiming )
+	uint32_t m_nFrameIndex;
+	uint32_t m_nNumFramePresents; // number of times this frame was presented
+	uint32_t m_nNumMisPresented; // number of times this frame was presented on a vsync other than it was originally predicted to
+	uint32_t m_nNumDroppedFrames; // number of additional times previous frame was scanned out
+	uint32_t m_nReprojectionFlags;
+
+	/** Absolute time reference for comparing frames.  This aligns with the vsync that running start is relative to. */
+	double m_flSystemTimeInSeconds;
+
+	/** These times may include work from other processes due to OS scheduling.
+	* The fewer packets of work these are broken up into, the less likely this will happen.
+	* GPU work can be broken up by calling Flush.  This can sometimes be useful to get the GPU started
+	* processing that work earlier in the frame. */
+	float m_flPreSubmitGpuMs; // time spent rendering the scene (gpu work submitted between WaitGetPoses and second Submit)
+	float m_flPostSubmitGpuMs; // additional time spent rendering by application (e.g. companion window)
+	float m_flTotalRenderGpuMs; // time between work submitted immediately after present (ideally vsync) until the end of compositor submitted work
+	float m_flCompositorRenderGpuMs; // time spend performing distortion correction, rendering chaperone, overlays, etc.
+	float m_flCompositorRenderCpuMs; // time spent on cpu submitting the above work for this frame
+	float m_flCompositorIdleCpuMs; // time spent waiting for running start (application could have used this much more time)
+
+	/** Miscellaneous measured intervals. */
+	float m_flClientFrameIntervalMs; // time between calls to WaitGetPoses
+	float m_flPresentCallCpuMs; // time blocked on call to present (usually 0.0, but can go long)
+	float m_flWaitForPresentCpuMs; // time spent spin-waiting for frame index to change (not near-zero indicates wait object failure)
+	float m_flSubmitFrameMs; // time spent in IVRCompositor::Submit (not near-zero indicates driver issue)
+
+	/** The following are all relative to this frame's SystemTimeInSeconds */
+	float m_flWaitGetPosesCalledMs;
+	float m_flNewPosesReadyMs;
+	float m_flNewFrameReadyMs; // second call to IVRCompositor::Submit
+	float m_flCompositorUpdateStartMs;
+	float m_flCompositorUpdateEndMs;
+	float m_flCompositorRenderStartMs;
+
+	vr::TrackedDevicePose_t m_HmdPose; // pose used by app to render this frame
+};
+
+/** Cumulative stats for current application.  These are not cleared until a new app connects,
+* but they do stop accumulating once the associated app disconnects. */
+struct Compositor_CumulativeStats
+{
+	uint32_t m_nPid; // Process id associated with these stats (may no longer be running).
+	uint32_t m_nNumFramePresents; // total number of times we called present (includes reprojected frames)
+	uint32_t m_nNumDroppedFrames; // total number of times an old frame was re-scanned out (without reprojection)
+	uint32_t m_nNumReprojectedFrames; // total number of times a frame was scanned out a second time (with reprojection)
+
+	/** Values recorded at startup before application has fully faded in the first time. */
+	uint32_t m_nNumFramePresentsOnStartup;
+	uint32_t m_nNumDroppedFramesOnStartup;
+	uint32_t m_nNumReprojectedFramesOnStartup;
+
+	/** Applications may explicitly fade to the compositor.  This is usually to handle level transitions, and loading often causes
+	* system wide hitches.  The following stats are collected during this period.  Does not include values recorded during startup. */
+	uint32_t m_nNumLoading;
+	uint32_t m_nNumFramePresentsLoading;
+	uint32_t m_nNumDroppedFramesLoading;
+	uint32_t m_nNumReprojectedFramesLoading;
+
+	/** If we don't get a new frame from the app in less than 2.5 frames, then we assume the app has hung and start
+	* fading back to the compositor.  The following stats are a result of this, and are a subset of those recorded above.
+	* Does not include values recorded during start up or loading. */
+	uint32_t m_nNumTimedOut;
+	uint32_t m_nNumFramePresentsTimedOut;
+	uint32_t m_nNumDroppedFramesTimedOut;
+	uint32_t m_nNumReprojectedFramesTimedOut;
+};
+
+#pragma pack( pop )
+
+/** Allows the application to interact with the compositor */
+class IVRCompositor
+{
+public:
+	/** Sets tracking space returned by WaitGetPoses */
+	virtual void SetTrackingSpace( ETrackingUniverseOrigin eOrigin ) = 0;
+
+	/** Gets current tracking space returned by WaitGetPoses */
+	virtual ETrackingUniverseOrigin GetTrackingSpace() = 0;
+
+	/** Scene applications should call this function to get poses to render with (and optionally poses predicted an additional frame out to use for gameplay).
+	* This function will block until "running start" milliseconds before the start of the frame, and should be called at the last moment before needing to
+	* start rendering.
+	*
+	* Return codes:
+	*	- IsNotSceneApplication (make sure to call VR_Init with VRApplicaiton_Scene)
+	*	- DoNotHaveFocus (some other app has taken focus - this will throttle the call to 10hz to reduce the impact on that app)
+	*/
+	virtual EVRCompositorError WaitGetPoses( VR_ARRAY_COUNT(unRenderPoseArrayCount) TrackedDevicePose_t* pRenderPoseArray, uint32_t unRenderPoseArrayCount,
+		VR_ARRAY_COUNT(unGamePoseArrayCount) TrackedDevicePose_t* pGamePoseArray, uint32_t unGamePoseArrayCount ) = 0;
+
+	/** Get the last set of poses returned by WaitGetPoses. */
+	virtual EVRCompositorError GetLastPoses( VR_ARRAY_COUNT( unRenderPoseArrayCount ) TrackedDevicePose_t* pRenderPoseArray, uint32_t unRenderPoseArrayCount,
+		VR_ARRAY_COUNT( unGamePoseArrayCount ) TrackedDevicePose_t* pGamePoseArray, uint32_t unGamePoseArrayCount ) = 0;
+
+	/** Interface for accessing last set of poses returned by WaitGetPoses one at a time.
+	* Returns VRCompositorError_IndexOutOfRange if unDeviceIndex not less than k_unMaxTrackedDeviceCount otherwise VRCompositorError_None.
+	* It is okay to pass NULL for either pose if you only want one of the values. */
+	virtual EVRCompositorError GetLastPoseForTrackedDeviceIndex( TrackedDeviceIndex_t unDeviceIndex, TrackedDevicePose_t *pOutputPose, TrackedDevicePose_t *pOutputGamePose ) = 0;
+
+	/** Updated scene texture to display. If pBounds is NULL the entire texture will be used.  If called from an OpenGL app, consider adding a glFlush after
+	* Submitting both frames to signal the driver to start processing, otherwise it may wait until the command buffer fills up, causing the app to miss frames.
+	*
+	* OpenGL dirty state:
+	*	glBindTexture
+	*
+	* Return codes:
+	*	- IsNotSceneApplication (make sure to call VR_Init with VRApplicaiton_Scene)
+	*	- DoNotHaveFocus (some other app has taken focus)
+	*	- TextureIsOnWrongDevice (application did not use proper AdapterIndex - see IVRSystem.GetDXGIOutputInfo)
+	*	- SharedTexturesNotSupported (application needs to call CreateDXGIFactory1 or later before creating DX device)
+	*	- TextureUsesUnsupportedFormat (scene textures must be compatible with DXGI sharing rules - e.g. uncompressed, no mips, etc.)
+	*	- InvalidTexture (usually means bad arguments passed in)
+	*	- AlreadySubmitted (app has submitted two left textures or two right textures in a single frame - i.e. before calling WaitGetPoses again)
+	*/
+	virtual EVRCompositorError Submit( EVREye eEye, const Texture_t *pTexture, const VRTextureBounds_t* pBounds = 0, EVRSubmitFlags nSubmitFlags = Submit_Default ) = 0;
+
+	/** Clears the frame that was sent with the last call to Submit. This will cause the 
+	* compositor to show the grid until Submit is called again. */
+	virtual void ClearLastSubmittedFrame() = 0;
+
+	/** Call immediately after presenting your app's window (i.e. companion window) to unblock the compositor.
+	* This is an optional call, which only needs to be used if you can't instead call WaitGetPoses immediately after Present.
+	* For example, if your engine's render and game loop are not on separate threads, or blocking the render thread until 3ms before the next vsync would
+	* introduce a deadlock of some sort.  This function tells the compositor that you have finished all rendering after having Submitted buffers for both
+	* eyes, and it is free to start its rendering work.  This should only be called from the same thread you are rendering on. */
+	virtual void PostPresentHandoff() = 0;
+
+	/** Returns true if timing data is filled it.  Sets oldest timing info if nFramesAgo is larger than the stored history.
+	* Be sure to set timing.size = sizeof(Compositor_FrameTiming) on struct passed in before calling this function. */
+	virtual bool GetFrameTiming( Compositor_FrameTiming *pTiming, uint32_t unFramesAgo = 0 ) = 0;
+
+	/** Interface for copying a range of timing data.  Frames are returned in ascending order (oldest to newest) with the last being the most recent frame.
+	* Only the first entry's m_nSize needs to be set, as the rest will be inferred from that.  Returns total number of entries filled out. */
+	virtual uint32_t GetFrameTimings( Compositor_FrameTiming *pTiming, uint32_t nFrames ) = 0;
+
+	/** Returns the time in seconds left in the current (as identified by FrameTiming's frameIndex) frame.
+	* Due to "running start", this value may roll over to the next frame before ever reaching 0.0. */
+	virtual float GetFrameTimeRemaining() = 0;
+
+	/** Fills out stats accumulated for the last connected application.  Pass in sizeof( Compositor_CumulativeStats ) as second parameter. */
+	virtual void GetCumulativeStats( Compositor_CumulativeStats *pStats, uint32_t nStatsSizeInBytes ) = 0;
+
+	/** Fades the view on the HMD to the specified color. The fade will take fSeconds, and the color values are between
+	* 0.0 and 1.0. This color is faded on top of the scene based on the alpha parameter. Removing the fade color instantly 
+	* would be FadeToColor( 0.0, 0.0, 0.0, 0.0, 0.0 ).  Values are in un-premultiplied alpha space. */
+	virtual void FadeToColor( float fSeconds, float fRed, float fGreen, float fBlue, float fAlpha, bool bBackground = false ) = 0;
+
+	/** Get current fade color value. */
+	virtual HmdColor_t GetCurrentFadeColor( bool bBackground = false ) = 0;
+
+	/** Fading the Grid in or out in fSeconds */
+	virtual void FadeGrid( float fSeconds, bool bFadeIn ) = 0;
+
+	/** Get current alpha value of grid. */
+	virtual float GetCurrentGridAlpha() = 0;
+
+	/** Override the skybox used in the compositor (e.g. for during level loads when the app can't feed scene images fast enough)
+	* Order is Front, Back, Left, Right, Top, Bottom.  If only a single texture is passed, it is assumed in lat-long format.
+	* If two are passed, it is assumed a lat-long stereo pair. */
+	virtual EVRCompositorError SetSkyboxOverride( VR_ARRAY_COUNT( unTextureCount ) const Texture_t *pTextures, uint32_t unTextureCount ) = 0;
+
+	/** Resets compositor skybox back to defaults. */
+	virtual void ClearSkyboxOverride() = 0;
+
+	/** Brings the compositor window to the front. This is useful for covering any other window that may be on the HMD
+	* and is obscuring the compositor window. */
+	virtual void CompositorBringToFront() = 0;
+
+	/** Pushes the compositor window to the back. This is useful for allowing other applications to draw directly to the HMD. */
+	virtual void CompositorGoToBack() = 0;
+
+	/** Tells the compositor process to clean up and exit. You do not need to call this function at shutdown. Under normal 
+	* circumstances the compositor will manage its own life cycle based on what applications are running. */
+	virtual void CompositorQuit() = 0;
+	
+	/** Return whether the compositor is fullscreen */
+	virtual bool IsFullscreen() = 0;
+
+	/** Returns the process ID of the process that is currently rendering the scene */
+	virtual uint32_t GetCurrentSceneFocusProcess() = 0;
+
+	/** Returns the process ID of the process that rendered the last frame (or 0 if the compositor itself rendered the frame.)
+	* Returns 0 when fading out from an app and the app's process Id when fading into an app. */
+	virtual uint32_t GetLastFrameRenderer() = 0;
+
+	/** Returns true if the current process has the scene focus */
+	virtual bool CanRenderScene() = 0;
+
+	/** Creates a window on the primary monitor to display what is being shown in the headset. */
+	virtual void ShowMirrorWindow() = 0;
+
+	/** Closes the mirror window. */
+	virtual void HideMirrorWindow() = 0;
+
+	/** Returns true if the mirror window is shown. */
+	virtual bool IsMirrorWindowVisible() = 0;
+
+	/** Writes all images that the compositor knows about (including overlays) to a 'screenshots' folder in the SteamVR runtime root. */
+	virtual void CompositorDumpImages() = 0;
+
+	/** Let an app know it should be rendering with low resources. */
+	virtual bool ShouldAppRenderWithLowResources() = 0;
+
+	/** Override interleaved reprojection logic to force on. */
+	virtual void ForceInterleavedReprojectionOn( bool bOverride ) = 0;
+
+	/** Force reconnecting to the compositor process. */
+	virtual void ForceReconnectProcess() = 0;
+
+	/** Temporarily suspends rendering (useful for finer control over scene transitions). */
+	virtual void SuspendRendering( bool bSuspend ) = 0;
+
+	/** Opens a shared D3D11 texture with the undistorted composited image for each eye.  Use ReleaseMirrorTextureD3D11 when finished
+	* instead of calling Release on the resource itself. */
+	virtual vr::EVRCompositorError GetMirrorTextureD3D11( vr::EVREye eEye, void *pD3D11DeviceOrResource, void **ppD3D11ShaderResourceView ) = 0;
+	virtual void ReleaseMirrorTextureD3D11( void *pD3D11ShaderResourceView ) = 0;
+
+	/** Access to mirror textures from OpenGL. */
+	virtual vr::EVRCompositorError GetMirrorTextureGL( vr::EVREye eEye, vr::glUInt_t *pglTextureId, vr::glSharedTextureHandle_t *pglSharedTextureHandle ) = 0;
+	virtual bool ReleaseSharedGLTexture( vr::glUInt_t glTextureId, vr::glSharedTextureHandle_t glSharedTextureHandle ) = 0;
+	virtual void LockGLSharedTextureForAccess( vr::glSharedTextureHandle_t glSharedTextureHandle ) = 0;
+	virtual void UnlockGLSharedTextureForAccess( vr::glSharedTextureHandle_t glSharedTextureHandle ) = 0;
+
+	/** [Vulkan Only]
+	* return 0. Otherwise it returns the length of the number of bytes necessary to hold this string including the trailing
+	* null.  The string will be a space separated list of-required instance extensions to enable in VkCreateInstance */
+	virtual uint32_t GetVulkanInstanceExtensionsRequired( VR_OUT_STRING() char *pchValue, uint32_t unBufferSize ) = 0;
+
+	/** [Vulkan only]
+	* return 0. Otherwise it returns the length of the number of bytes necessary to hold this string including the trailing
+	* null.  The string will be a space separated list of required device extensions to enable in VkCreateDevice */
+	virtual uint32_t GetVulkanDeviceExtensionsRequired( VkPhysicalDevice_T *pPhysicalDevice, VR_OUT_STRING() char *pchValue, uint32_t unBufferSize ) = 0;
+
+	/** [ Vulkan/D3D12 Only ]
+	* There are two purposes for SetExplicitTimingMode:
+	*	1. To get a more accurate GPU timestamp for when the frame begins in Vulkan/D3D12 applications.
+	*	2. (Optional) To avoid having WaitGetPoses access the Vulkan queue so that the queue can be accessed from
+	*	another thread while WaitGetPoses is executing.
+	*
+	* More accurate GPU timestamp for the start of the frame is achieved by the application calling
+	* SubmitExplicitTimingData immediately before its first submission to the Vulkan/D3D12 queue.
+	* This is more accurate because normally this GPU timestamp is recorded during WaitGetPoses.  In D3D11, 
+	* WaitGetPoses queues a GPU timestamp write, but it does not actually get submitted to the GPU until the 
+	* application flushes.  By using SubmitExplicitTimingData, the timestamp is recorded at the same place for 
+	* Vulkan/D3D12 as it is for D3D11, resulting in a more accurate GPU time measurement for the frame.
+	*
+	* Avoiding WaitGetPoses accessing the Vulkan queue can be achieved using SetExplicitTimingMode as well.  If this is desired,
+	* the application should set the timing mode to Explicit_ApplicationPerformsPostPresentHandoff and *MUST* call PostPresentHandoff
+	* itself. If these conditions are met, then WaitGetPoses is guaranteed not to access the queue.  Note that PostPresentHandoff
+	* and SubmitExplicitTimingData will access the queue, so only WaitGetPoses becomes safe for accessing the queue from another
+	* thread. */
+	virtual void SetExplicitTimingMode( EVRCompositorTimingMode eTimingMode ) = 0;
+
+	/** [ Vulkan/D3D12 Only ]
+	* Submit explicit timing data.  When SetExplicitTimingMode is true, this must be called immediately before
+	* the application's first vkQueueSubmit (Vulkan) or ID3D12CommandQueue::ExecuteCommandLists (D3D12) of each frame.
+	* This function will insert a GPU timestamp write just before the application starts its rendering.  This function
+	* will perform a vkQueueSubmit on Vulkan so must not be done simultaneously with VkQueue operations on another thread.
+	* Returns VRCompositorError_RequestFailed if SetExplicitTimingMode is not enabled. */
+	virtual EVRCompositorError SubmitExplicitTimingData() = 0;
+};
+
+static const char * const IVRCompositor_Version = "IVRCompositor_022";
+
+} // namespace vr
+
+
+
+// ivrnotifications.h
+namespace vr
+{
+
+#pragma pack( push, 8 )
+
+// Used for passing graphic data
+struct NotificationBitmap_t
+{
+	NotificationBitmap_t()
+		: m_pImageData( nullptr )
+		, m_nWidth( 0 )
+		, m_nHeight( 0 )
+		, m_nBytesPerPixel( 0 )
+	{
+	};
+
+	void *m_pImageData;
+	int32_t m_nWidth;
+	int32_t m_nHeight;
+	int32_t m_nBytesPerPixel;
+};
+
+
+/** Be aware that the notification type is used as 'priority' to pick the next notification */
+enum EVRNotificationType
+{
+	/** Transient notifications are automatically hidden after a period of time set by the user. 
+	* They are used for things like information and chat messages that do not require user interaction. */
+	EVRNotificationType_Transient = 0,
+
+	/** Persistent notifications are shown to the user until they are hidden by calling RemoveNotification().
+	* They are used for things like phone calls and alarms that require user interaction. */
+	EVRNotificationType_Persistent = 1,
+
+	/** System notifications are shown no matter what. It is expected, that the ulUserValue is used as ID.
+	 * If there is already a system notification in the queue with that ID it is not accepted into the queue
+	 * to prevent spamming with system notification */
+	EVRNotificationType_Transient_SystemWithUserValue = 2,
+};
+
+enum EVRNotificationStyle
+{
+	/** Creates a notification with minimal external styling. */
+	EVRNotificationStyle_None = 0,
+
+	/** Used for notifications about overlay-level status. In Steam this is used for events like downloads completing. */
+	EVRNotificationStyle_Application = 100,
+
+	/** Used for notifications about contacts that are unknown or not available. In Steam this is used for friend invitations and offline friends. */
+	EVRNotificationStyle_Contact_Disabled = 200,
+
+	/** Used for notifications about contacts that are available but inactive. In Steam this is used for friends that are online but not playing a game. */
+	EVRNotificationStyle_Contact_Enabled = 201,
+
+	/** Used for notifications about contacts that are available and active. In Steam this is used for friends that are online and currently running a game. */
+	EVRNotificationStyle_Contact_Active = 202,
+};
+
+static const uint32_t k_unNotificationTextMaxSize = 256;
+
+typedef uint32_t VRNotificationId;
+
+
+
+#pragma pack( pop )
+
+/** Allows notification sources to interact with the VR system
+	This current interface is not yet implemented. Do not use yet. */
+class IVRNotifications
+{
+public:
+	/** Create a notification and enqueue it to be shown to the user.
+	* An overlay handle is required to create a notification, as otherwise it would be impossible for a user to act on it.
+	* To create a two-line notification, use a line break ('\n') to split the text into two lines.
+	* The pImage argument may be NULL, in which case the specified overlay's icon will be used instead. */
+	virtual EVRNotificationError CreateNotification( VROverlayHandle_t ulOverlayHandle, uint64_t ulUserValue, EVRNotificationType type, const char *pchText, EVRNotificationStyle style, const NotificationBitmap_t *pImage, /* out */ VRNotificationId *pNotificationId ) = 0;
+
+	/** Destroy a notification, hiding it first if it currently shown to the user. */
+	virtual EVRNotificationError RemoveNotification( VRNotificationId notificationId ) = 0;
+
+};
+
+static const char * const IVRNotifications_Version = "IVRNotifications_002";
+
+} // namespace vr
+
+
+
+// ivroverlay.h
+namespace vr
+{
+
+	/** The maximum length of an overlay key in bytes, counting the terminating null character. */
+	static const uint32_t k_unVROverlayMaxKeyLength = 128;
+
+	/** The maximum length of an overlay name in bytes, counting the terminating null character. */
+	static const uint32_t k_unVROverlayMaxNameLength = 128;
+
+	/** The maximum number of overlays that can exist in the system at one time. */
+	static const uint32_t k_unMaxOverlayCount = 64;
+
+	/** The maximum number of overlay intersection mask primitives per overlay */
+	static const uint32_t k_unMaxOverlayIntersectionMaskPrimitivesCount = 32;
+
+	/** Types of input supported by VR Overlays */
+	enum VROverlayInputMethod
+	{
+		VROverlayInputMethod_None		= 0, // No input events will be generated automatically for this overlay
+		VROverlayInputMethod_Mouse		= 1, // Tracked controllers will get mouse events automatically
+		VROverlayInputMethod_DualAnalog = 2, // Analog inputs from tracked controllers are turned into DualAnalog events
+	};
+
+	/** Allows the caller to figure out which overlay transform getter to call. */
+	enum VROverlayTransformType
+	{
+		VROverlayTransform_Absolute					= 0,
+		VROverlayTransform_TrackedDeviceRelative	= 1,
+		VROverlayTransform_SystemOverlay			= 2,
+		VROverlayTransform_TrackedComponent 		= 3,
+	};
+
+	/** Overlay control settings */
+	enum VROverlayFlags
+	{
+		VROverlayFlags_None			= 0,
+
+		// The following only take effect when rendered using the high quality render path (see SetHighQualityOverlay).
+		VROverlayFlags_Curved		= 1,
+		VROverlayFlags_RGSS4X		= 2,
+
+		// Set this flag on a dashboard overlay to prevent a tab from showing up for that overlay
+		VROverlayFlags_NoDashboardTab = 3,
+
+		// Set this flag on a dashboard that is able to deal with gamepad focus events
+		VROverlayFlags_AcceptsGamepadEvents = 4,
+
+		// Indicates that the overlay should dim/brighten to show gamepad focus
+		VROverlayFlags_ShowGamepadFocus = 5,
+
+		// When in VROverlayInputMethod_Mouse you can optionally enable sending VRScroll_t 
+		VROverlayFlags_SendVRScrollEvents = 6,
+		VROverlayFlags_SendVRTouchpadEvents = 7,
+
+		// If set this will render a vertical scroll wheel on the primary controller, 
+		//  only needed if not using VROverlayFlags_SendVRScrollEvents but you still want to represent a scroll wheel
+		VROverlayFlags_ShowTouchPadScrollWheel = 8,
+
+		// If this is set ownership and render access to the overlay are transferred 
+		// to the new scene process on a call to IVRApplications::LaunchInternalProcess
+		VROverlayFlags_TransferOwnershipToInternalProcess = 9,
+
+		// If set, renders 50% of the texture in each eye, side by side
+		VROverlayFlags_SideBySide_Parallel = 10, // Texture is left/right
+		VROverlayFlags_SideBySide_Crossed = 11, // Texture is crossed and right/left
+
+		VROverlayFlags_Panorama = 12, // Texture is a panorama
+		VROverlayFlags_StereoPanorama = 13, // Texture is a stereo panorama
+
+		// If this is set on an overlay owned by the scene application that overlay
+		// will be sorted with the "Other" overlays on top of all other scene overlays
+		VROverlayFlags_SortWithNonSceneOverlays = 14,
+
+		// If set, the overlay will be shown in the dashboard, otherwise it will be hidden.
+		VROverlayFlags_VisibleInDashboard = 15,
+	};
+
+	enum VRMessageOverlayResponse
+	{
+		VRMessageOverlayResponse_ButtonPress_0 = 0,
+		VRMessageOverlayResponse_ButtonPress_1 = 1,
+		VRMessageOverlayResponse_ButtonPress_2 = 2,
+		VRMessageOverlayResponse_ButtonPress_3 = 3,
+		VRMessageOverlayResponse_CouldntFindSystemOverlay = 4,
+		VRMessageOverlayResponse_CouldntFindOrCreateClientOverlay= 5,
+		VRMessageOverlayResponse_ApplicationQuit = 6
+	};
+
+	struct VROverlayIntersectionParams_t
+	{
+		HmdVector3_t vSource;
+		HmdVector3_t vDirection;
+		ETrackingUniverseOrigin eOrigin;
+	};
+
+	struct VROverlayIntersectionResults_t
+	{
+		HmdVector3_t vPoint;
+		HmdVector3_t vNormal;
+		HmdVector2_t vUVs;
+		float fDistance;
+	};
+
+	// Input modes for the Big Picture gamepad text entry
+	enum EGamepadTextInputMode
+	{
+		k_EGamepadTextInputModeNormal = 0,
+		k_EGamepadTextInputModePassword = 1,
+		k_EGamepadTextInputModeSubmit = 2,
+	};
+
+	// Controls number of allowed lines for the Big Picture gamepad text entry
+	enum EGamepadTextInputLineMode
+	{
+		k_EGamepadTextInputLineModeSingleLine = 0,
+		k_EGamepadTextInputLineModeMultipleLines = 1
+	};
+
+	/** Directions for changing focus between overlays with the gamepad */
+	enum EOverlayDirection
+	{
+		OverlayDirection_Up = 0,
+		OverlayDirection_Down = 1,
+		OverlayDirection_Left = 2,
+		OverlayDirection_Right = 3,
+		
+		OverlayDirection_Count = 4,
+	};
+
+	enum EVROverlayIntersectionMaskPrimitiveType
+	{
+		OverlayIntersectionPrimitiveType_Rectangle,
+		OverlayIntersectionPrimitiveType_Circle,
+	};
+
+	struct IntersectionMaskRectangle_t
+	{
+		float m_flTopLeftX;
+		float m_flTopLeftY;
+		float m_flWidth;
+		float m_flHeight;
+	};
+
+	struct IntersectionMaskCircle_t
+	{
+		float m_flCenterX;
+		float m_flCenterY;
+		float m_flRadius;
+	};
+
+	/** NOTE!!! If you change this you MUST manually update openvr_interop.cs.py and openvr_api_flat.h.py */
+	typedef union
+	{
+		IntersectionMaskRectangle_t m_Rectangle;
+		IntersectionMaskCircle_t m_Circle;
+	} VROverlayIntersectionMaskPrimitive_Data_t;
+
+	struct VROverlayIntersectionMaskPrimitive_t
+	{
+		EVROverlayIntersectionMaskPrimitiveType m_nPrimitiveType;
+		VROverlayIntersectionMaskPrimitive_Data_t m_Primitive;
+	};
+
+	class IVROverlay
+	{
+	public:
+
+		// ---------------------------------------------
+		// Overlay management methods
+		// ---------------------------------------------
+
+		/** Finds an existing overlay with the specified key. */
+		virtual EVROverlayError FindOverlay( const char *pchOverlayKey, VROverlayHandle_t * pOverlayHandle ) = 0;
+
+		/** Creates a new named overlay. All overlays start hidden and with default settings. */
+		virtual EVROverlayError CreateOverlay( const char *pchOverlayKey, const char *pchOverlayName, VROverlayHandle_t * pOverlayHandle ) = 0;
+
+		/** Destroys the specified overlay. When an application calls VR_Shutdown all overlays created by that app are
+		* automatically destroyed. */
+		virtual EVROverlayError DestroyOverlay( VROverlayHandle_t ulOverlayHandle ) = 0;
+
+		/** Specify which overlay to use the high quality render path.  This overlay will be composited in during the distortion pass which
+		* results in it drawing on top of everything else, but also at a higher quality as it samples the source texture directly rather than
+		* rasterizing into each eye's render texture first.  Because if this, only one of these is supported at any given time.  It is most useful
+		* for overlays that are expected to take up most of the user's view (e.g. streaming video).
+		* This mode does not support mouse input to your overlay. */
+		virtual EVROverlayError SetHighQualityOverlay( VROverlayHandle_t ulOverlayHandle ) = 0;
+
+		/** Returns the overlay handle of the current overlay being rendered using the single high quality overlay render path.
+		* Otherwise it will return k_ulOverlayHandleInvalid. */
+		virtual vr::VROverlayHandle_t GetHighQualityOverlay() = 0;
+
+		/** Fills the provided buffer with the string key of the overlay. Returns the size of buffer required to store the key, including
+		* the terminating null character. k_unVROverlayMaxKeyLength will be enough bytes to fit the string. */
+		virtual uint32_t GetOverlayKey( VROverlayHandle_t ulOverlayHandle, VR_OUT_STRING() char *pchValue, uint32_t unBufferSize, EVROverlayError *pError = 0L ) = 0;
+
+		/** Fills the provided buffer with the friendly name of the overlay. Returns the size of buffer required to store the key, including
+		* the terminating null character. k_unVROverlayMaxNameLength will be enough bytes to fit the string. */
+		virtual uint32_t GetOverlayName( VROverlayHandle_t ulOverlayHandle, VR_OUT_STRING() char *pchValue, uint32_t unBufferSize, EVROverlayError *pError = 0L ) = 0;
+
+		/** set the name to use for this overlay */
+		virtual EVROverlayError SetOverlayName( VROverlayHandle_t ulOverlayHandle, const char *pchName ) = 0;
+
+		/** Gets the raw image data from an overlay. Overlay image data is always returned as RGBA data, 4 bytes per pixel. If the buffer is not large enough, width and height 
+		* will be set and VROverlayError_ArrayTooSmall is returned. */
+		virtual EVROverlayError GetOverlayImageData( VROverlayHandle_t ulOverlayHandle, void *pvBuffer, uint32_t unBufferSize, uint32_t *punWidth, uint32_t *punHeight ) = 0;
+
+		/** returns a string that corresponds with the specified overlay error. The string will be the name 
+		* of the error enum value for all valid error codes */
+		virtual const char *GetOverlayErrorNameFromEnum( EVROverlayError error ) = 0;
+
+		// ---------------------------------------------
+		// Overlay rendering methods
+		// ---------------------------------------------
+
+		/** Sets the pid that is allowed to render to this overlay (the creator pid is always allow to render),
+		*	by default this is the pid of the process that made the overlay */
+		virtual EVROverlayError SetOverlayRenderingPid( VROverlayHandle_t ulOverlayHandle, uint32_t unPID ) = 0;
+
+		/** Gets the pid that is allowed to render to this overlay */
+		virtual uint32_t GetOverlayRenderingPid( VROverlayHandle_t ulOverlayHandle ) = 0;
+
+		/** Specify flag setting for a given overlay */
+		virtual EVROverlayError SetOverlayFlag( VROverlayHandle_t ulOverlayHandle, VROverlayFlags eOverlayFlag, bool bEnabled ) = 0;
+
+		/** Sets flag setting for a given overlay */
+		virtual EVROverlayError GetOverlayFlag( VROverlayHandle_t ulOverlayHandle, VROverlayFlags eOverlayFlag, bool *pbEnabled ) = 0;
+
+		/** Sets the color tint of the overlay quad. Use 0.0 to 1.0 per channel. */
+		virtual EVROverlayError SetOverlayColor( VROverlayHandle_t ulOverlayHandle, float fRed, float fGreen, float fBlue ) = 0;
+
+		/** Gets the color tint of the overlay quad. */
+		virtual EVROverlayError GetOverlayColor( VROverlayHandle_t ulOverlayHandle, float *pfRed, float *pfGreen, float *pfBlue ) = 0;
+
+		/** Sets the alpha of the overlay quad. Use 1.0 for 100 percent opacity to 0.0 for 0 percent opacity. */
+		virtual EVROverlayError SetOverlayAlpha( VROverlayHandle_t ulOverlayHandle, float fAlpha ) = 0;
+
+		/** Gets the alpha of the overlay quad. By default overlays are rendering at 100 percent alpha (1.0). */
+		virtual EVROverlayError GetOverlayAlpha( VROverlayHandle_t ulOverlayHandle, float *pfAlpha ) = 0;
+
+		/** Sets the aspect ratio of the texels in the overlay. 1.0 means the texels are square. 2.0 means the texels
+		* are twice as wide as they are tall. Defaults to 1.0. */
+		virtual EVROverlayError SetOverlayTexelAspect( VROverlayHandle_t ulOverlayHandle, float fTexelAspect ) = 0;
+
+		/** Gets the aspect ratio of the texels in the overlay. Defaults to 1.0 */
+		virtual EVROverlayError GetOverlayTexelAspect( VROverlayHandle_t ulOverlayHandle, float *pfTexelAspect ) = 0;
+
+		/** Sets the rendering sort order for the overlay. Overlays are rendered this order:
+		*      Overlays owned by the scene application
+		*      Overlays owned by some other application
+		*
+		*	Within a category overlays are rendered lowest sort order to highest sort order. Overlays with the same 
+		*	sort order are rendered back to front base on distance from the HMD.
+		*
+		*	Sort order defaults to 0. */
+		virtual EVROverlayError SetOverlaySortOrder( VROverlayHandle_t ulOverlayHandle, uint32_t unSortOrder ) = 0;
+
+		/** Gets the sort order of the overlay. See SetOverlaySortOrder for how this works. */
+		virtual EVROverlayError GetOverlaySortOrder( VROverlayHandle_t ulOverlayHandle, uint32_t *punSortOrder ) = 0;
+
+		/** Sets the width of the overlay quad in meters. By default overlays are rendered on a quad that is 1 meter across */
+		virtual EVROverlayError SetOverlayWidthInMeters( VROverlayHandle_t ulOverlayHandle, float fWidthInMeters ) = 0;
+
+		/** Returns the width of the overlay quad in meters. By default overlays are rendered on a quad that is 1 meter across */
+		virtual EVROverlayError GetOverlayWidthInMeters( VROverlayHandle_t ulOverlayHandle, float *pfWidthInMeters ) = 0;
+
+		/** For high-quality curved overlays only, sets the distance range in meters from the overlay used to automatically curve
+		* the surface around the viewer.  Min is distance is when the surface will be most curved.  Max is when least curved. */
+		virtual EVROverlayError SetOverlayAutoCurveDistanceRangeInMeters( VROverlayHandle_t ulOverlayHandle, float fMinDistanceInMeters, float fMaxDistanceInMeters ) = 0;
+
+		/** For high-quality curved overlays only, gets the distance range in meters from the overlay used to automatically curve
+		* the surface around the viewer.  Min is distance is when the surface will be most curved.  Max is when least curved. */
+		virtual EVROverlayError GetOverlayAutoCurveDistanceRangeInMeters( VROverlayHandle_t ulOverlayHandle, float *pfMinDistanceInMeters, float *pfMaxDistanceInMeters ) = 0;
+
+		/** Sets the colorspace the overlay texture's data is in.  Defaults to 'auto'.
+		* If the texture needs to be resolved, you should call SetOverlayTexture with the appropriate colorspace instead. */
+		virtual EVROverlayError SetOverlayTextureColorSpace( VROverlayHandle_t ulOverlayHandle, EColorSpace eTextureColorSpace ) = 0;
+
+		/** Gets the overlay's current colorspace setting. */
+		virtual EVROverlayError GetOverlayTextureColorSpace( VROverlayHandle_t ulOverlayHandle, EColorSpace *peTextureColorSpace ) = 0;
+
+		/** Sets the part of the texture to use for the overlay. UV Min is the upper left corner and UV Max is the lower right corner. */
+		virtual EVROverlayError SetOverlayTextureBounds( VROverlayHandle_t ulOverlayHandle, const VRTextureBounds_t *pOverlayTextureBounds ) = 0;
+
+		/** Gets the part of the texture to use for the overlay. UV Min is the upper left corner and UV Max is the lower right corner. */
+		virtual EVROverlayError GetOverlayTextureBounds( VROverlayHandle_t ulOverlayHandle, VRTextureBounds_t *pOverlayTextureBounds ) = 0;
+
+		/** Gets render model to draw behind this overlay */
+		virtual uint32_t GetOverlayRenderModel( vr::VROverlayHandle_t ulOverlayHandle, VR_OUT_STRING() char *pchValue, uint32_t unBufferSize, HmdColor_t *pColor, vr::EVROverlayError *pError ) = 0;
+
+		/** Sets render model to draw behind this overlay and the vertex color to use, pass null for pColor to match the overlays vertex color. 
+			The model is scaled by the same amount as the overlay, with a default of 1m. */
+		virtual vr::EVROverlayError SetOverlayRenderModel( vr::VROverlayHandle_t ulOverlayHandle, const char *pchRenderModel, const HmdColor_t *pColor ) = 0;
+
+		/** Returns the transform type of this overlay. */
+		virtual EVROverlayError GetOverlayTransformType( VROverlayHandle_t ulOverlayHandle, VROverlayTransformType *peTransformType ) = 0;
+
+		/** Sets the transform to absolute tracking origin. */
+		virtual EVROverlayError SetOverlayTransformAbsolute( VROverlayHandle_t ulOverlayHandle, ETrackingUniverseOrigin eTrackingOrigin, const HmdMatrix34_t *pmatTrackingOriginToOverlayTransform ) = 0;
+
+		/** Gets the transform if it is absolute. Returns an error if the transform is some other type. */
+		virtual EVROverlayError GetOverlayTransformAbsolute( VROverlayHandle_t ulOverlayHandle, ETrackingUniverseOrigin *peTrackingOrigin, HmdMatrix34_t *pmatTrackingOriginToOverlayTransform ) = 0;
+
+		/** Sets the transform to relative to the transform of the specified tracked device. */
+		virtual EVROverlayError SetOverlayTransformTrackedDeviceRelative( VROverlayHandle_t ulOverlayHandle, TrackedDeviceIndex_t unTrackedDevice, const HmdMatrix34_t *pmatTrackedDeviceToOverlayTransform ) = 0;
+
+		/** Gets the transform if it is relative to a tracked device. Returns an error if the transform is some other type. */
+		virtual EVROverlayError GetOverlayTransformTrackedDeviceRelative( VROverlayHandle_t ulOverlayHandle, TrackedDeviceIndex_t *punTrackedDevice, HmdMatrix34_t *pmatTrackedDeviceToOverlayTransform ) = 0;
+
+		/** Sets the transform to draw the overlay on a rendermodel component mesh instead of a quad. This will only draw when the system is
+		* drawing the device. Overlays with this transform type cannot receive mouse events. */
+		virtual EVROverlayError SetOverlayTransformTrackedDeviceComponent( VROverlayHandle_t ulOverlayHandle, TrackedDeviceIndex_t unDeviceIndex, const char *pchComponentName ) = 0;
+
+		/** Gets the transform information when the overlay is rendering on a component. */
+		virtual EVROverlayError GetOverlayTransformTrackedDeviceComponent( VROverlayHandle_t ulOverlayHandle, TrackedDeviceIndex_t *punDeviceIndex, VR_OUT_STRING() char *pchComponentName, uint32_t unComponentNameSize ) = 0;
+
+		/** Gets the transform if it is relative to another overlay. Returns an error if the transform is some other type. */
+		virtual vr::EVROverlayError GetOverlayTransformOverlayRelative( VROverlayHandle_t ulOverlayHandle, VROverlayHandle_t *ulOverlayHandleParent, HmdMatrix34_t *pmatParentOverlayToOverlayTransform ) = 0;
+		
+		/** Sets the transform to relative to the transform of the specified overlay. This overlays visibility will also track the parents visibility */
+		virtual vr::EVROverlayError SetOverlayTransformOverlayRelative( VROverlayHandle_t ulOverlayHandle, VROverlayHandle_t ulOverlayHandleParent, const HmdMatrix34_t *pmatParentOverlayToOverlayTransform ) = 0;
+
+		/** Shows the VR overlay.  For dashboard overlays, only the Dashboard Manager is allowed to call this. */
+		virtual EVROverlayError ShowOverlay( VROverlayHandle_t ulOverlayHandle ) = 0;
+
+		/** Hides the VR overlay.  For dashboard overlays, only the Dashboard Manager is allowed to call this. */
+		virtual EVROverlayError HideOverlay( VROverlayHandle_t ulOverlayHandle ) = 0;
+
+		/** Returns true if the overlay is visible. */
+		virtual bool IsOverlayVisible( VROverlayHandle_t ulOverlayHandle ) = 0;
+
+		/** Get the transform in 3d space associated with a specific 2d point in the overlay's coordinate space (where 0,0 is the lower left). -Z points out of the overlay */
+		virtual EVROverlayError GetTransformForOverlayCoordinates( VROverlayHandle_t ulOverlayHandle, ETrackingUniverseOrigin eTrackingOrigin, HmdVector2_t coordinatesInOverlay, HmdMatrix34_t *pmatTransform ) = 0;
+
+		// ---------------------------------------------
+		// Overlay input methods
+		// ---------------------------------------------
+
+		/** Returns true and fills the event with the next event on the overlay's event queue, if there is one. 
+		* If there are no events this method returns false. uncbVREvent should be the size in bytes of the VREvent_t struct */
+		virtual bool PollNextOverlayEvent( VROverlayHandle_t ulOverlayHandle, VREvent_t *pEvent, uint32_t uncbVREvent ) = 0;
+
+		/** Returns the current input settings for the specified overlay. */
+		virtual EVROverlayError GetOverlayInputMethod( VROverlayHandle_t ulOverlayHandle, VROverlayInputMethod *peInputMethod ) = 0;
+
+		/** Sets the input settings for the specified overlay. */
+		virtual EVROverlayError SetOverlayInputMethod( VROverlayHandle_t ulOverlayHandle, VROverlayInputMethod eInputMethod ) = 0;
+
+		/** Gets the mouse scaling factor that is used for mouse events. The actual texture may be a different size, but this is
+		* typically the size of the underlying UI in pixels. */
+		virtual EVROverlayError GetOverlayMouseScale( VROverlayHandle_t ulOverlayHandle, HmdVector2_t *pvecMouseScale ) = 0;
+
+		/** Sets the mouse scaling factor that is used for mouse events. The actual texture may be a different size, but this is
+		* typically the size of the underlying UI in pixels (not in world space). */
+		virtual EVROverlayError SetOverlayMouseScale( VROverlayHandle_t ulOverlayHandle, const HmdVector2_t *pvecMouseScale ) = 0;
+
+		/** Computes the overlay-space pixel coordinates of where the ray intersects the overlay with the
+		* specified settings. Returns false if there is no intersection. */
+		virtual bool ComputeOverlayIntersection( VROverlayHandle_t ulOverlayHandle, const VROverlayIntersectionParams_t *pParams, VROverlayIntersectionResults_t *pResults ) = 0;
+
+		/** Returns true if the specified overlay is the hover target. An overlay is the hover target when it is the last overlay "moused over" 
+		* by the virtual mouse pointer */
+		virtual bool IsHoverTargetOverlay( VROverlayHandle_t ulOverlayHandle ) = 0;
+
+		/** Returns the current Gamepad focus overlay */
+		virtual vr::VROverlayHandle_t GetGamepadFocusOverlay() = 0;
+
+		/** Sets the current Gamepad focus overlay */
+		virtual EVROverlayError SetGamepadFocusOverlay( VROverlayHandle_t ulNewFocusOverlay ) = 0;
+
+		/** Sets an overlay's neighbor. This will also set the neighbor of the "to" overlay
+		* to point back to the "from" overlay. If an overlay's neighbor is set to invalid both
+		* ends will be cleared */
+		virtual EVROverlayError SetOverlayNeighbor( EOverlayDirection eDirection, VROverlayHandle_t ulFrom, VROverlayHandle_t ulTo ) = 0;
+
+		/** Changes the Gamepad focus from one overlay to one of its neighbors. Returns VROverlayError_NoNeighbor if there is no
+		* neighbor in that direction */
+		virtual EVROverlayError MoveGamepadFocusToNeighbor( EOverlayDirection eDirection, VROverlayHandle_t ulFrom ) = 0;
+
+		/** Sets the analog input to Dual Analog coordinate scale for the specified overlay. */
+		virtual EVROverlayError SetOverlayDualAnalogTransform( VROverlayHandle_t ulOverlay, EDualAnalogWhich eWhich, const HmdVector2_t & vCenter, float fRadius ) = 0;
+
+		/** Gets the analog input to Dual Analog coordinate scale for the specified overlay. */
+		virtual EVROverlayError GetOverlayDualAnalogTransform( VROverlayHandle_t ulOverlay, EDualAnalogWhich eWhich, HmdVector2_t *pvCenter, float *pfRadius ) = 0;
+
+		// ---------------------------------------------
+		// Overlay texture methods
+		// ---------------------------------------------
+
+		/** Texture to draw for the overlay. This function can only be called by the overlay's creator or renderer process (see SetOverlayRenderingPid) .
+		*
+		* OpenGL dirty state:
+		*	glBindTexture
+		*/
+		virtual EVROverlayError SetOverlayTexture( VROverlayHandle_t ulOverlayHandle, const Texture_t *pTexture ) = 0;
+
+		/** Use this to tell the overlay system to release the texture set for this overlay. */
+		virtual EVROverlayError ClearOverlayTexture( VROverlayHandle_t ulOverlayHandle ) = 0;
+
+		/** Separate interface for providing the data as a stream of bytes, but there is an upper bound on data 
+		* that can be sent. This function can only be called by the overlay's renderer process. */
+		virtual EVROverlayError SetOverlayRaw( VROverlayHandle_t ulOverlayHandle, void *pvBuffer, uint32_t unWidth, uint32_t unHeight, uint32_t unDepth ) = 0;
+
+		/** Separate interface for providing the image through a filename: can be png or jpg, and should not be bigger than 1920x1080.
+		* This function can only be called by the overlay's renderer process */
+		virtual EVROverlayError SetOverlayFromFile( VROverlayHandle_t ulOverlayHandle, const char *pchFilePath ) = 0;
+
+		/** Get the native texture handle/device for an overlay you have created.
+		* On windows this handle will be a ID3D11ShaderResourceView with a ID3D11Texture2D bound.
+		*
+		* The texture will always be sized to match the backing texture you supplied in SetOverlayTexture above.
+		*
+		* You MUST call ReleaseNativeOverlayHandle() with pNativeTextureHandle once you are done with this texture.
+		*
+		* pNativeTextureHandle is an OUTPUT, it will be a pointer to a ID3D11ShaderResourceView *.
+		* pNativeTextureRef is an INPUT and should be a ID3D11Resource *. The device used by pNativeTextureRef will be used to bind pNativeTextureHandle.
+		*/
+		virtual EVROverlayError GetOverlayTexture( VROverlayHandle_t ulOverlayHandle, void **pNativeTextureHandle, void *pNativeTextureRef, uint32_t *pWidth, uint32_t *pHeight, uint32_t *pNativeFormat, ETextureType *pAPIType, EColorSpace *pColorSpace, VRTextureBounds_t *pTextureBounds ) = 0;
+
+		/** Release the pNativeTextureHandle provided from the GetOverlayTexture call, this allows the system to free the underlying GPU resources for this object,
+		* so only do it once you stop rendering this texture.
+		*/
+		virtual EVROverlayError ReleaseNativeOverlayHandle( VROverlayHandle_t ulOverlayHandle, void *pNativeTextureHandle ) = 0;
+
+		/** Get the size of the overlay texture */
+		virtual EVROverlayError GetOverlayTextureSize( VROverlayHandle_t ulOverlayHandle, uint32_t *pWidth, uint32_t *pHeight ) = 0;
+
+		// ----------------------------------------------
+		// Dashboard Overlay Methods
+		// ----------------------------------------------
+
+		/** Creates a dashboard overlay and returns its handle */
+		virtual EVROverlayError CreateDashboardOverlay( const char *pchOverlayKey, const char *pchOverlayFriendlyName, VROverlayHandle_t * pMainHandle, VROverlayHandle_t *pThumbnailHandle ) = 0;
+
+		/** Returns true if the dashboard is visible */
+		virtual bool IsDashboardVisible() = 0;
+
+		/** returns true if the dashboard is visible and the specified overlay is the active system Overlay */
+		virtual bool IsActiveDashboardOverlay( VROverlayHandle_t ulOverlayHandle ) = 0;
+
+		/** Sets the dashboard overlay to only appear when the specified process ID has scene focus */
+		virtual EVROverlayError SetDashboardOverlaySceneProcess( VROverlayHandle_t ulOverlayHandle, uint32_t unProcessId ) = 0;
+
+		/** Gets the process ID that this dashboard overlay requires to have scene focus */
+		virtual EVROverlayError GetDashboardOverlaySceneProcess( VROverlayHandle_t ulOverlayHandle, uint32_t *punProcessId ) = 0;
+
+		/** Shows the dashboard. */
+		virtual void ShowDashboard( const char *pchOverlayToShow ) = 0;
+
+		/** Returns the tracked device that has the laser pointer in the dashboard */
+		virtual vr::TrackedDeviceIndex_t GetPrimaryDashboardDevice() = 0;
+
+		// ---------------------------------------------
+		// Keyboard methods
+		// ---------------------------------------------
+		
+		/** Show the virtual keyboard to accept input **/
+		virtual EVROverlayError ShowKeyboard( EGamepadTextInputMode eInputMode, EGamepadTextInputLineMode eLineInputMode, const char *pchDescription, uint32_t unCharMax, const char *pchExistingText, bool bUseMinimalMode, uint64_t uUserValue ) = 0;
+
+		virtual EVROverlayError ShowKeyboardForOverlay( VROverlayHandle_t ulOverlayHandle, EGamepadTextInputMode eInputMode, EGamepadTextInputLineMode eLineInputMode, const char *pchDescription, uint32_t unCharMax, const char *pchExistingText, bool bUseMinimalMode, uint64_t uUserValue ) = 0;
+
+		/** Get the text that was entered into the text input **/
+		virtual uint32_t GetKeyboardText( VR_OUT_STRING() char *pchText, uint32_t cchText ) = 0;
+
+		/** Hide the virtual keyboard **/
+		virtual void HideKeyboard() = 0;
+
+		/** Set the position of the keyboard in world space **/
+		virtual void SetKeyboardTransformAbsolute( ETrackingUniverseOrigin eTrackingOrigin, const HmdMatrix34_t *pmatTrackingOriginToKeyboardTransform ) = 0;
+
+		/** Set the position of the keyboard in overlay space by telling it to avoid a rectangle in the overlay. Rectangle coords have (0,0) in the bottom left **/
+		virtual void SetKeyboardPositionForOverlay( VROverlayHandle_t ulOverlayHandle, HmdRect2_t avoidRect ) = 0;
+
+		// ---------------------------------------------
+		// Overlay input methods
+		// ---------------------------------------------
+
+		/** Sets a list of primitives to be used for controller ray intersection
+		* typically the size of the underlying UI in pixels (not in world space). */
+		virtual EVROverlayError SetOverlayIntersectionMask( VROverlayHandle_t ulOverlayHandle, VROverlayIntersectionMaskPrimitive_t *pMaskPrimitives, uint32_t unNumMaskPrimitives, uint32_t unPrimitiveSize = sizeof( VROverlayIntersectionMaskPrimitive_t ) ) = 0;
+
+		virtual EVROverlayError GetOverlayFlags( VROverlayHandle_t ulOverlayHandle, uint32_t *pFlags ) = 0;
+
+		// ---------------------------------------------
+		// Message box methods
+		// ---------------------------------------------
+
+		/** Show the message overlay. This will block and return you a result. **/
+		virtual VRMessageOverlayResponse ShowMessageOverlay( const char* pchText, const char* pchCaption, const char* pchButton0Text, const char* pchButton1Text = nullptr, const char* pchButton2Text = nullptr, const char* pchButton3Text = nullptr ) = 0;
+
+		/** If the calling process owns the overlay and it's open, this will close it. **/
+		virtual void CloseMessageOverlay() = 0;
+	};
+
+	static const char * const IVROverlay_Version = "IVROverlay_018";
+
+} // namespace vr
+
+// ivrrendermodels.h
+namespace vr
+{
+
+static const char * const k_pch_Controller_Component_GDC2015 = "gdc2015";   // Canonical coordinate system of the gdc 2015 wired controller, provided for backwards compatibility
+static const char * const k_pch_Controller_Component_Base = "base";         // For controllers with an unambiguous 'base'.
+static const char * const k_pch_Controller_Component_Tip = "tip";           // For controllers with an unambiguous 'tip' (used for 'laser-pointing')
+static const char * const k_pch_Controller_Component_HandGrip = "handgrip"; // Neutral, ambidextrous hand-pose when holding controller. On plane between neutrally posed index finger and thumb
+static const char * const k_pch_Controller_Component_Status = "status";		// 1:1 aspect ratio status area, with canonical [0,1] uv mapping
+
+#pragma pack( push, 8 )
+
+/** Errors that can occur with the VR compositor */
+enum EVRRenderModelError
+{
+	VRRenderModelError_None = 0,
+	VRRenderModelError_Loading = 100,
+	VRRenderModelError_NotSupported = 200,
+	VRRenderModelError_InvalidArg = 300,
+	VRRenderModelError_InvalidModel = 301,
+	VRRenderModelError_NoShapes = 302,
+	VRRenderModelError_MultipleShapes = 303,
+	VRRenderModelError_TooManyVertices = 304,
+	VRRenderModelError_MultipleTextures = 305,
+	VRRenderModelError_BufferTooSmall = 306,
+	VRRenderModelError_NotEnoughNormals = 307,
+	VRRenderModelError_NotEnoughTexCoords = 308,
+
+	VRRenderModelError_InvalidTexture = 400,
+};
+
+typedef uint32_t VRComponentProperties;
+
+enum EVRComponentProperty
+{
+	VRComponentProperty_IsStatic = (1 << 0),
+	VRComponentProperty_IsVisible = (1 << 1),
+	VRComponentProperty_IsTouched = (1 << 2),
+	VRComponentProperty_IsPressed = (1 << 3),
+	VRComponentProperty_IsScrolled = (1 << 4),
+};
+
+/** Describes state information about a render-model component, including transforms and other dynamic properties */
+struct RenderModel_ComponentState_t
+{
+	HmdMatrix34_t mTrackingToComponentRenderModel;  // Transform required when drawing the component render model
+	HmdMatrix34_t mTrackingToComponentLocal;        // Transform available for attaching to a local component coordinate system (-Z out from surface )
+	VRComponentProperties uProperties;
+};
+
+/** A single vertex in a render model */
+struct RenderModel_Vertex_t
+{
+	HmdVector3_t vPosition;		// position in meters in device space
+	HmdVector3_t vNormal;
+	float rfTextureCoord[2];
+};
+
+/** A texture map for use on a render model */
+#if defined(__linux__) || defined(__APPLE__) 
+// This structure was originally defined mis-packed on Linux, preserved for 
+// compatibility. 
+#pragma pack( push, 4 )
+#endif
+
+struct RenderModel_TextureMap_t
+{
+	uint16_t unWidth, unHeight; // width and height of the texture map in pixels
+	const uint8_t *rubTextureMapData;	// Map texture data. All textures are RGBA with 8 bits per channel per pixel. Data size is width * height * 4ub
+};
+#if defined(__linux__) || defined(__APPLE__) 
+#pragma pack( pop )
+#endif
+
+/**  Session unique texture identifier. Rendermodels which share the same texture will have the same id.
+IDs <0 denote the texture is not present */
+
+typedef int32_t TextureID_t;
+
+const TextureID_t INVALID_TEXTURE_ID = -1;
+
+#if defined(__linux__) || defined(__APPLE__) 
+// This structure was originally defined mis-packed on Linux, preserved for 
+// compatibility. 
+#pragma pack( push, 4 )
+#endif
+
+struct RenderModel_t
+{
+	const RenderModel_Vertex_t *rVertexData;	// Vertex data for the mesh
+	uint32_t unVertexCount;						// Number of vertices in the vertex data
+	const uint16_t *rIndexData;					// Indices into the vertex data for each triangle
+	uint32_t unTriangleCount;					// Number of triangles in the mesh. Index count is 3 * TriangleCount
+	TextureID_t diffuseTextureId;				// Session unique texture identifier. Rendermodels which share the same texture will have the same id. <0 == texture not present
+};
+#if defined(__linux__) || defined(__APPLE__) 
+#pragma pack( pop )
+#endif
+
+
+struct RenderModel_ControllerMode_State_t
+{
+	bool bScrollWheelVisible; // is this controller currently set to be in a scroll wheel mode
+};
+
+#pragma pack( pop )
+
+class IVRRenderModels
+{
+public:
+
+	/** Loads and returns a render model for use in the application. pchRenderModelName should be a render model name
+	* from the Prop_RenderModelName_String property or an absolute path name to a render model on disk. 
+	*
+	* The resulting render model is valid until VR_Shutdown() is called or until FreeRenderModel() is called. When the 
+	* application is finished with the render model it should call FreeRenderModel() to free the memory associated
+	* with the model.
+	*
+	* The method returns VRRenderModelError_Loading while the render model is still being loaded.
+	* The method returns VRRenderModelError_None once loaded successfully, otherwise will return an error. */
+	virtual EVRRenderModelError LoadRenderModel_Async( const char *pchRenderModelName, RenderModel_t **ppRenderModel ) = 0;
+
+	/** Frees a previously returned render model
+	*   It is safe to call this on a null ptr. */
+	virtual void FreeRenderModel( RenderModel_t *pRenderModel ) = 0;
+
+	/** Loads and returns a texture for use in the application. */
+	virtual EVRRenderModelError LoadTexture_Async( TextureID_t textureId, RenderModel_TextureMap_t **ppTexture ) = 0;
+
+	/** Frees a previously returned texture
+	*   It is safe to call this on a null ptr. */
+	virtual void FreeTexture( RenderModel_TextureMap_t *pTexture ) = 0;
+
+	/** Creates a D3D11 texture and loads data into it. */
+	virtual EVRRenderModelError LoadTextureD3D11_Async( TextureID_t textureId, void *pD3D11Device, void **ppD3D11Texture2D ) = 0;
+
+	/** Helper function to copy the bits into an existing texture. */
+	virtual EVRRenderModelError LoadIntoTextureD3D11_Async( TextureID_t textureId, void *pDstTexture ) = 0;
+
+	/** Use this to free textures created with LoadTextureD3D11_Async instead of calling Release on them. */
+	virtual void FreeTextureD3D11( void *pD3D11Texture2D ) = 0;
+
+	/** Use this to get the names of available render models.  Index does not correlate to a tracked device index, but
+	* is only used for iterating over all available render models.  If the index is out of range, this function will return 0.
+	* Otherwise, it will return the size of the buffer required for the name. */
+	virtual uint32_t GetRenderModelName( uint32_t unRenderModelIndex, VR_OUT_STRING() char *pchRenderModelName, uint32_t unRenderModelNameLen ) = 0;
+
+	/** Returns the number of available render models. */
+	virtual uint32_t GetRenderModelCount() = 0;
+
+
+	/** Returns the number of components of the specified render model.
+	*  Components are useful when client application wish to draw, label, or otherwise interact with components of tracked objects.
+	*  Examples controller components:
+	*   renderable things such as triggers, buttons
+	*   non-renderable things which include coordinate systems such as 'tip', 'base', a neutral controller agnostic hand-pose
+	*   If all controller components are enumerated and rendered, it will be equivalent to drawing the traditional render model
+	*   Returns 0 if components not supported, >0 otherwise */
+	virtual uint32_t GetComponentCount( const char *pchRenderModelName ) = 0;
+
+	/** Use this to get the names of available components.  Index does not correlate to a tracked device index, but
+	* is only used for iterating over all available components.  If the index is out of range, this function will return 0.
+	* Otherwise, it will return the size of the buffer required for the name. */
+	virtual uint32_t GetComponentName( const char *pchRenderModelName, uint32_t unComponentIndex, VR_OUT_STRING( ) char *pchComponentName, uint32_t unComponentNameLen ) = 0;
+
+	/** Get the button mask for all buttons associated with this component
+	*   If no buttons (or axes) are associated with this component, return 0
+	*   Note: multiple components may be associated with the same button. Ex: two grip buttons on a single controller.
+	*   Note: A single component may be associated with multiple buttons. Ex: A trackpad which also provides "D-pad" functionality */
+	virtual uint64_t GetComponentButtonMask( const char *pchRenderModelName, const char *pchComponentName ) = 0;
+
+	/** Use this to get the render model name for the specified rendermode/component combination, to be passed to LoadRenderModel.
+	* If the component name is out of range, this function will return 0.
+	* Otherwise, it will return the size of the buffer required for the name. */
+	virtual uint32_t GetComponentRenderModelName( const char *pchRenderModelName, const char *pchComponentName, VR_OUT_STRING( ) char *pchComponentRenderModelName, uint32_t unComponentRenderModelNameLen ) = 0;
+
+	/** Use this to query information about the component, as a function of the controller state.
+	*
+	* For dynamic controller components (ex: trigger) values will reflect component motions
+	* For static components this will return a consistent value independent of the VRControllerState_t
+	*
+	* If the pchRenderModelName or pchComponentName is invalid, this will return false (and transforms will be set to identity).
+	* Otherwise, return true
+	* Note: For dynamic objects, visibility may be dynamic. (I.e., true/false will be returned based on controller state and controller mode state ) */
+	virtual bool GetComponentState( const char *pchRenderModelName, const char *pchComponentName, const vr::VRControllerState_t *pControllerState, const RenderModel_ControllerMode_State_t *pState, RenderModel_ComponentState_t *pComponentState ) = 0;
+
+	/** Returns true if the render model has a component with the specified name */
+	virtual bool RenderModelHasComponent( const char *pchRenderModelName, const char *pchComponentName ) = 0;
+
+	/** Returns the URL of the thumbnail image for this rendermodel */
+	virtual uint32_t GetRenderModelThumbnailURL( const char *pchRenderModelName, VR_OUT_STRING() char *pchThumbnailURL, uint32_t unThumbnailURLLen, vr::EVRRenderModelError *peError ) = 0;
+
+	/** Provides a render model path that will load the unskinned model if the model name provided has been replace by the user. If the model
+	* hasn't been replaced the path value will still be a valid path to load the model. Pass this to LoadRenderModel_Async, etc. to load the
+	* model. */
+	virtual uint32_t GetRenderModelOriginalPath( const char *pchRenderModelName, VR_OUT_STRING() char *pchOriginalPath, uint32_t unOriginalPathLen, vr::EVRRenderModelError *peError ) = 0;
+
+	/** Returns a string for a render model error */
+	virtual const char *GetRenderModelErrorNameFromEnum( vr::EVRRenderModelError error ) = 0;
+};
+
+static const char * const IVRRenderModels_Version = "IVRRenderModels_005";
+
+}
+
+
+// ivrextendeddisplay.h
+namespace vr
+{
+
+	/** NOTE: Use of this interface is not recommended in production applications. It will not work for displays which use
+	* direct-to-display mode. Creating our own window is also incompatible with the VR compositor and is not available when the compositor is running. */
+	class IVRExtendedDisplay
+	{
+	public:
+
+		/** Size and position that the window needs to be on the VR display. */
+		virtual void GetWindowBounds( int32_t *pnX, int32_t *pnY, uint32_t *pnWidth, uint32_t *pnHeight ) = 0;
+
+		/** Gets the viewport in the frame buffer to draw the output of the distortion into */
+		virtual void GetEyeOutputViewport( EVREye eEye, uint32_t *pnX, uint32_t *pnY, uint32_t *pnWidth, uint32_t *pnHeight ) = 0;
+
+		/** [D3D10/11 Only]
+		* Returns the adapter index and output index that the user should pass into EnumAdapters and EnumOutputs
+		* to create the device and swap chain in DX10 and DX11. If an error occurs both indices will be set to -1.
+		*/
+		virtual void GetDXGIOutputInfo( int32_t *pnAdapterIndex, int32_t *pnAdapterOutputIndex ) = 0;
+
+	};
+
+	static const char * const IVRExtendedDisplay_Version = "IVRExtendedDisplay_001";
+
+}
+
+
+// ivrtrackedcamera.h
+namespace vr
+{
+
+class IVRTrackedCamera
+{
+public:
+	/** Returns a string for an error */
+	virtual const char *GetCameraErrorNameFromEnum( vr::EVRTrackedCameraError eCameraError ) = 0;
+
+	/** For convenience, same as tracked property request Prop_HasCamera_Bool */
+	virtual vr::EVRTrackedCameraError HasCamera( vr::TrackedDeviceIndex_t nDeviceIndex, bool *pHasCamera ) = 0;
+
+	/** Gets size of the image frame. */
+	virtual vr::EVRTrackedCameraError GetCameraFrameSize( vr::TrackedDeviceIndex_t nDeviceIndex, vr::EVRTrackedCameraFrameType eFrameType, uint32_t *pnWidth, uint32_t *pnHeight, uint32_t *pnFrameBufferSize ) = 0;
+
+	virtual vr::EVRTrackedCameraError GetCameraIntrinsics( vr::TrackedDeviceIndex_t nDeviceIndex, vr::EVRTrackedCameraFrameType eFrameType, vr::HmdVector2_t *pFocalLength, vr::HmdVector2_t *pCenter ) = 0;
+
+	virtual vr::EVRTrackedCameraError GetCameraProjection( vr::TrackedDeviceIndex_t nDeviceIndex, vr::EVRTrackedCameraFrameType eFrameType, float flZNear, float flZFar, vr::HmdMatrix44_t *pProjection ) = 0;
+
+	/** Acquiring streaming service permits video streaming for the caller. Releasing hints the system that video services do not need to be maintained for this client.
+	* If the camera has not already been activated, a one time spin up may incur some auto exposure as well as initial streaming frame delays.
+	* The camera should be considered a global resource accessible for shared consumption but not exclusive to any caller.
+	* The camera may go inactive due to lack of active consumers or headset idleness. */
+	virtual vr::EVRTrackedCameraError AcquireVideoStreamingService( vr::TrackedDeviceIndex_t nDeviceIndex, vr::TrackedCameraHandle_t *pHandle ) = 0;
+	virtual vr::EVRTrackedCameraError ReleaseVideoStreamingService( vr::TrackedCameraHandle_t hTrackedCamera ) = 0;
+
+	/** Copies the image frame into a caller's provided buffer. The image data is currently provided as RGBA data, 4 bytes per pixel.
+	* A caller can provide null for the framebuffer or frameheader if not desired. Requesting the frame header first, followed by the frame buffer allows
+	* the caller to determine if the frame as advanced per the frame header sequence. 
+	* If there is no frame available yet, due to initial camera spinup or re-activation, the error will be VRTrackedCameraError_NoFrameAvailable.
+	* Ideally a caller should be polling at ~16ms intervals */
+	virtual vr::EVRTrackedCameraError GetVideoStreamFrameBuffer( vr::TrackedCameraHandle_t hTrackedCamera, vr::EVRTrackedCameraFrameType eFrameType, void *pFrameBuffer, uint32_t nFrameBufferSize, vr::CameraVideoStreamFrameHeader_t *pFrameHeader, uint32_t nFrameHeaderSize ) = 0;
+
+	/** Gets size of the image frame. */
+	virtual vr::EVRTrackedCameraError GetVideoStreamTextureSize( vr::TrackedDeviceIndex_t nDeviceIndex, vr::EVRTrackedCameraFrameType eFrameType, vr::VRTextureBounds_t *pTextureBounds, uint32_t *pnWidth, uint32_t *pnHeight ) = 0; 
+
+	/** Access a shared D3D11 texture for the specified tracked camera stream.
+	* The camera frame type VRTrackedCameraFrameType_Undistorted is not supported directly as a shared texture. It is an interior subregion of the shared texture VRTrackedCameraFrameType_MaximumUndistorted.
+	* Instead, use GetVideoStreamTextureSize() with VRTrackedCameraFrameType_Undistorted to determine the proper interior subregion bounds along with GetVideoStreamTextureD3D11() with
+	* VRTrackedCameraFrameType_MaximumUndistorted to provide the texture. The VRTrackedCameraFrameType_MaximumUndistorted will yield an image where the invalid regions are decoded
+	* by the alpha channel having a zero component. The valid regions all have a non-zero alpha component. The subregion as described by VRTrackedCameraFrameType_Undistorted 
+	* guarantees a rectangle where all pixels are valid. */
+	virtual vr::EVRTrackedCameraError GetVideoStreamTextureD3D11( vr::TrackedCameraHandle_t hTrackedCamera, vr::EVRTrackedCameraFrameType eFrameType, void *pD3D11DeviceOrResource, void **ppD3D11ShaderResourceView, vr::CameraVideoStreamFrameHeader_t *pFrameHeader, uint32_t nFrameHeaderSize ) = 0;
+
+	/** Access a shared GL texture for the specified tracked camera stream */
+	virtual vr::EVRTrackedCameraError GetVideoStreamTextureGL( vr::TrackedCameraHandle_t hTrackedCamera, vr::EVRTrackedCameraFrameType eFrameType, vr::glUInt_t *pglTextureId, vr::CameraVideoStreamFrameHeader_t *pFrameHeader, uint32_t nFrameHeaderSize ) = 0;
+	virtual vr::EVRTrackedCameraError ReleaseVideoStreamTextureGL( vr::TrackedCameraHandle_t hTrackedCamera, vr::glUInt_t glTextureId ) = 0;
+};
+
+static const char * const IVRTrackedCamera_Version = "IVRTrackedCamera_003";
+
+} // namespace vr
+
+
+// ivrscreenshots.h
+namespace vr
+{
+
+/** Errors that can occur with the VR compositor */
+enum EVRScreenshotError
+{
+	VRScreenshotError_None							= 0,
+	VRScreenshotError_RequestFailed					= 1,
+	VRScreenshotError_IncompatibleVersion			= 100,
+	VRScreenshotError_NotFound						= 101,
+	VRScreenshotError_BufferTooSmall				= 102,
+	VRScreenshotError_ScreenshotAlreadyInProgress	= 108,
+};
+
+/** Allows the application to generate screenshots */
+class IVRScreenshots
+{
+public:
+	/** Request a screenshot of the requested type.
+	 *  A request of the VRScreenshotType_Stereo type will always
+	 *  work. Other types will depend on the underlying application
+	 *  support.
+	 *  The first file name is for the preview image and should be a
+	 *  regular screenshot (ideally from the left eye). The second
+	 *  is the VR screenshot in the correct format. They should be
+	 *  in the same aspect ratio.  Formats per type:
+	 *  VRScreenshotType_Mono: the VR filename is ignored (can be
+	 *  nullptr), this is a normal flat single shot.
+	 *  VRScreenshotType_Stereo:  The VR image should be a
+	 *  side-by-side with the left eye image on the left.
+	 *  VRScreenshotType_Cubemap: The VR image should be six square
+	 *  images composited horizontally.
+	 *  VRScreenshotType_StereoPanorama: above/below with left eye
+	 *  panorama being the above image.  Image is typically square
+	 *  with the panorama being 2x horizontal.
+	 *  
+	 *  Note that the VR dashboard will call this function when
+	 *  the user presses the screenshot binding (currently System
+	 *  Button + Trigger).  If Steam is running, the destination
+	 *  file names will be in %TEMP% and will be copied into
+	 *  Steam's screenshot library for the running application
+	 *  once SubmitScreenshot() is called.
+	 *  If Steam is not running, the paths will be in the user's
+	 *  documents folder under Documents\SteamVR\Screenshots.
+	 *  Other VR applications can call this to initiate a
+	 *  screenshot outside of user control.
+	 *  The destination file names do not need an extension,
+	 *  will be replaced with the correct one for the format
+	 *  which is currently .png. */
+	virtual vr::EVRScreenshotError RequestScreenshot( vr::ScreenshotHandle_t *pOutScreenshotHandle, vr::EVRScreenshotType type, const char *pchPreviewFilename, const char *pchVRFilename ) = 0;
+
+	/** Called by the running VR application to indicate that it
+	 *  wishes to be in charge of screenshots.  If the
+	 *  application does not call this, the Compositor will only
+	 *  support VRScreenshotType_Stereo screenshots that will be
+	 *  captured without notification to the running app.
+	 *  Once hooked your application will receive a
+	 *  VREvent_RequestScreenshot event when the user presses the
+	 *  buttons to take a screenshot. */
+	virtual vr::EVRScreenshotError HookScreenshot( VR_ARRAY_COUNT( numTypes ) const vr::EVRScreenshotType *pSupportedTypes, int numTypes ) = 0;
+
+	/** When your application receives a
+	 *  VREvent_RequestScreenshot event, call these functions to get
+	 *  the details of the screenshot request. */
+	virtual vr::EVRScreenshotType GetScreenshotPropertyType( vr::ScreenshotHandle_t screenshotHandle, vr::EVRScreenshotError *pError ) = 0;
+
+	/** Get the filename for the preview or vr image (see
+	 *  vr::EScreenshotPropertyFilenames).  The return value is
+	 *  the size of the string.   */
+ 	virtual uint32_t GetScreenshotPropertyFilename( vr::ScreenshotHandle_t screenshotHandle, vr::EVRScreenshotPropertyFilenames filenameType, VR_OUT_STRING() char *pchFilename, uint32_t cchFilename, vr::EVRScreenshotError *pError ) = 0;
+
+	/** Call this if the application is taking the screen shot
+	 *  will take more than a few ms processing. This will result
+	 *  in an overlay being presented that shows a completion
+	 *  bar. */
+	virtual vr::EVRScreenshotError UpdateScreenshotProgress( vr::ScreenshotHandle_t screenshotHandle, float flProgress ) = 0;
+
+	/** Tells the compositor to take an internal screenshot of
+	 *  type VRScreenshotType_Stereo. It will take the current
+	 *  submitted scene textures of the running application and
+	 *  write them into the preview image and a side-by-side file
+	 *  for the VR image.
+	 *  This is similar to request screenshot, but doesn't ever
+	 *  talk to the application, just takes the shot and submits. */
+	virtual vr::EVRScreenshotError TakeStereoScreenshot( vr::ScreenshotHandle_t *pOutScreenshotHandle, const char *pchPreviewFilename, const char *pchVRFilename ) = 0;
+
+	/** Submit the completed screenshot.  If Steam is running
+	 *  this will call into the Steam client and upload the
+	 *  screenshot to the screenshots section of the library for
+	 *  the running application.  If Steam is not running, this
+	 *  function will display a notification to the user that the
+	 *  screenshot was taken. The paths should be full paths with
+	 *  extensions.
+	 *  File paths should be absolute including extensions.
+	 *  screenshotHandle can be k_unScreenshotHandleInvalid if this
+	 *  was a new shot taking by the app to be saved and not
+	 *  initiated by a user (achievement earned or something) */
+	virtual vr::EVRScreenshotError SubmitScreenshot( vr::ScreenshotHandle_t screenshotHandle, vr::EVRScreenshotType type, const char *pchSourcePreviewFilename, const char *pchSourceVRFilename ) = 0;
+};
+
+static const char * const IVRScreenshots_Version = "IVRScreenshots_001";
+
+} // namespace vr
+
+
+
+// ivrresources.h
+namespace vr
+{
+
+class IVRResources
+{
+public:
+
+	// ------------------------------------
+	// Shared Resource Methods
+	// ------------------------------------
+
+	/** Loads the specified resource into the provided buffer if large enough.
+	* Returns the size in bytes of the buffer required to hold the specified resource. */
+	virtual uint32_t LoadSharedResource( const char *pchResourceName, char *pchBuffer, uint32_t unBufferLen ) = 0;
+
+	/** Provides the full path to the specified resource. Resource names can include named directories for
+	* drivers and other things, and this resolves all of those and returns the actual physical path. 
+	* pchResourceTypeDirectory is the subdirectory of resources to look in. */
+	virtual uint32_t GetResourceFullPath( const char *pchResourceName, const char *pchResourceTypeDirectory, VR_OUT_STRING() char *pchPathBuffer, uint32_t unBufferLen ) = 0;
+};
+
+static const char * const IVRResources_Version = "IVRResources_001";
+
+
+}
+// ivrdrivermanager.h
+namespace vr
+{
+
+class IVRDriverManager
+{
+public:
+	virtual uint32_t GetDriverCount() const = 0;
+
+	/** Returns the length of the number of bytes necessary to hold this string including the trailing null. */
+	virtual uint32_t GetDriverName( vr::DriverId_t nDriver, VR_OUT_STRING() char *pchValue, uint32_t unBufferSize ) = 0;
+
+	virtual DriverHandle_t GetDriverHandle( const char *pchDriverName ) = 0;
+};
+
+static const char * const IVRDriverManager_Version = "IVRDriverManager_001";
+
+} // namespace vr
+
+
+
+// ivrinput.h
+namespace vr
+{
+
+	typedef uint64_t VRActionHandle_t;
+	typedef uint64_t VRActionSetHandle_t;
+	typedef uint64_t VRInputValueHandle_t;
+
+	static const VRActionHandle_t k_ulInvalidActionHandle = 0;
+	static const VRActionSetHandle_t k_ulInvalidActionSetHandle = 0;
+	static const VRInputValueHandle_t k_ulInvalidInputValueHandle = 0;
+
+	static const uint32_t k_unMaxActionNameLength = 64;
+	static const uint32_t k_unMaxActionSetNameLength = 64;
+	static const uint32_t k_unMaxActionOriginCount = 16;
+
+	struct InputAnalogActionData_t
+	{
+		// Whether or not this action is currently available to be bound in the active action set
+		bool bActive;
+
+		// The origin that caused this action's current state
+		VRInputValueHandle_t activeOrigin;
+
+		// The current state of this action; will be delta updates for mouse actions
+		float x, y, z;
+
+		// Deltas since the previous call to UpdateActionState()
+		float deltaX, deltaY, deltaZ;
+	
+		// Time relative to now when this event happened. Will be negative to indicate a past time.
+		float fUpdateTime;
+	};
+
+	struct InputDigitalActionData_t
+	{
+		// Whether or not this action is currently available to be bound in the active action set
+		bool bActive;
+
+		// The origin that caused this action's current state
+		VRInputValueHandle_t activeOrigin;
+
+		// The current state of this action; will be true if currently pressed
+		bool bState;
+
+		// This is true if the state has changed since the last frame
+		bool bChanged;
+
+		// Time relative to now when this event happened. Will be negative to indicate a past time.
+		float fUpdateTime;
+	};
+
+	struct InputPoseActionData_t
+	{
+		// Whether or not this action is currently available to be bound in the active action set
+		bool bActive;
+
+		// The origin that caused this action's current state
+		VRInputValueHandle_t activeOrigin;
+
+		// The current state of this action
+		TrackedDevicePose_t pose;
+	};
+
+	enum EVRSkeletalTransformSpace
+	{
+		VRSkeletalTransformSpace_Action = 0,
+		VRSkeletalTransformSpace_Parent = 1,
+		VRSkeletalTransformSpace_Additive = 2,
+	};
+
+
+	struct InputSkeletonActionData_t
+	{
+		// Whether or not this action is currently available to be bound in the active action set
+		bool bActive;
+
+		// The origin that caused this action's current state
+		VRInputValueHandle_t activeOrigin;
+	};
+
+	enum EVRInputFilterCancelType
+	{
+		VRInputFilterCancel_Timers = 0,
+		VRInputFilterCancel_Momentum = 1,
+	};
+
+	struct InputOriginInfo_t
+	{
+		VRInputValueHandle_t devicePath;
+		TrackedDeviceIndex_t trackedDeviceIndex;
+		char rchRenderModelComponentName[128];
+	};
+
+	struct VRActiveActionSet_t
+	{
+		/** This is the handle of the action set to activate for this frame. */
+		VRActionSetHandle_t ulActionSet;
+
+		/** This is the handle of a device path that this action set should be active for. To
+		* activate for all devices, set this to k_ulInvalidInputValueHandle. */
+		VRInputValueHandle_t ulRestrictedToDevice;
+
+		/** The action set to activate for all devices other than ulRestrictedDevice. If 
+		* ulRestrictedToDevice is set to k_ulInvalidInputValueHandle, this parameter is 
+		* ignored. */
+		VRActionSetHandle_t ulSecondaryActionSet;
+	};
+
+
+	class IVRInput
+	{
+	public:
+
+		// ---------------  Handle management   --------------- //
+
+		/** Sets the path to the action manifest JSON file that is used by this application. If this information
+		* was set on the Steam partner site, calls to this function are ignored. If the Steam partner site
+		* setting and the path provided by this call are different, VRInputError_MismatchedActionManifest is returned. 
+		* This call must be made before the first call to UpdateActionState or IVRSystem::PollNextEvent. */
+		virtual EVRInputError SetActionManifestPath( const char *pchActionManifestPath ) = 0;
+
+		/** Returns a handle for an action set. This handle is used for all performance-sensitive calls. */
+		virtual EVRInputError GetActionSetHandle( const char *pchActionSetName, VRActionSetHandle_t *pHandle ) = 0;
+
+		/** Returns a handle for an action. This handle is used for all performance-sensitive calls. */
+		virtual EVRInputError GetActionHandle( const char *pchActionName, VRActionHandle_t *pHandle ) = 0;
+
+		/** Returns a handle for any path in the input system. E.g. /user/hand/right */
+		virtual EVRInputError GetInputSourceHandle( const char *pchInputSourcePath, VRInputValueHandle_t  *pHandle ) = 0;
+
+		// --------------- Reading action state ------------------- //
+
+		/** Reads the current state into all actions. After this call, the results of Get*Action calls 
+		* will be the same until the next call to UpdateActionState. */
+		virtual EVRInputError UpdateActionState( VR_ARRAY_COUNT( unSetCount ) VRActiveActionSet_t *pSets, uint32_t unSizeOfVRSelectedActionSet_t, uint32_t unSetCount ) = 0;
+
+		/** Reads the state of a digital action given its handle. This will return VRInputError_WrongType if the type of
+		* action is something other than digital */
+		virtual EVRInputError GetDigitalActionData( VRActionHandle_t action, InputDigitalActionData_t *pActionData, uint32_t unActionDataSize ) = 0;
+
+		/** Reads the state of an analog action given its handle. This will return VRInputError_WrongType if the type of
+		* action is something other than analog */
+		virtual EVRInputError GetAnalogActionData( VRActionHandle_t action, InputAnalogActionData_t *pActionData, uint32_t unActionDataSize ) = 0;
+
+		/** Reads the state of a pose action given its handle. */
+		virtual EVRInputError GetPoseActionData( VRActionHandle_t action, ETrackingUniverseOrigin eOrigin, float fPredictedSecondsFromNow, InputPoseActionData_t *pActionData, uint32_t unActionDataSize ) = 0;
+
+		/** Reads the state of a skeletal action given its handle. */
+		virtual EVRInputError GetSkeletalActionData( VRActionHandle_t action, EVRSkeletalTransformSpace eBoneParent, float fPredictedSecondsFromNow, InputSkeletonActionData_t *pActionData, uint32_t unActionDataSize, VR_ARRAY_COUNT( unTransformArrayCount ) VRBoneTransform_t *pTransformArray, uint32_t unTransformArrayCount ) = 0;
+
+		/** Reads the state of a skeletal action given its handle in a compressed form that is suitable for
+		* sending over the network. The required buffer size will never exceed ( sizeof(VR_BoneTransform_t)*boneCount + 2).
+		* Usually the size will be much smaller. */
+		virtual EVRInputError GetSkeletalActionDataCompressed( VRActionHandle_t action, EVRSkeletalTransformSpace eBoneParent, float fPredictedSecondsFromNow, VR_OUT_BUFFER_COUNT( unCompressedSize ) void *pvCompressedData, uint32_t unCompressedSize, uint32_t *punRequiredCompressedSize ) = 0;
+
+		/** Turns a compressed buffer from GetSkeletalActionDataCompressed and turns it back into a bone transform array. */
+		virtual EVRInputError UncompressSkeletalActionData( void *pvCompressedBuffer, uint32_t unCompressedBufferSize, EVRSkeletalTransformSpace *peBoneParent, VR_ARRAY_COUNT( unTransformArrayCount ) VRBoneTransform_t *pTransformArray, uint32_t unTransformArrayCount ) = 0;
+
+		// --------------- Haptics ------------------- //
+
+		/** Triggers a haptic event as described by the specified action */
+		virtual EVRInputError TriggerHapticVibrationAction( VRActionHandle_t action, float fStartSecondsFromNow, float fDurationSeconds, float fFrequency, float fAmplitude ) = 0;
+
+		// --------------- Action Origins ---------------- //
+
+		/** Retrieve origin handles for an action */
+		virtual EVRInputError GetActionOrigins( VRActionSetHandle_t actionSetHandle, VRActionHandle_t digitalActionHandle, VR_ARRAY_COUNT( originOutCount ) VRInputValueHandle_t *originsOut, uint32_t originOutCount ) = 0;
+
+		/** Retrieves the name of the origin in the current language */
+		virtual EVRInputError GetOriginLocalizedName( VRInputValueHandle_t origin, VR_OUT_STRING() char *pchNameArray, uint32_t unNameArraySize ) = 0;
+
+		/** Retrieves useful information for the origin of this action */
+		virtual EVRInputError GetOriginTrackedDeviceInfo( VRInputValueHandle_t origin, InputOriginInfo_t *pOriginInfo, uint32_t unOriginInfoSize ) = 0;
+
+		/** Shows the current binding for the action in-headset */
+		virtual EVRInputError ShowActionOrigins( VRActionSetHandle_t actionSetHandle, VRActionHandle_t ulActionHandle ) = 0;
+
+		/** Shows the current binding all the actions in the specified action sets */
+		virtual EVRInputError ShowBindingsForActionSet( VR_ARRAY_COUNT( unSetCount ) VRActiveActionSet_t *pSets, uint32_t unSizeOfVRSelectedActionSet_t, uint32_t unSetCount, VRInputValueHandle_t originToHighlight ) = 0;
+	};
+
+	static const char * const IVRInput_Version = "IVRInput_003";
+
+} // namespace vr
+
+// ivriobuffer.h
+namespace vr
+{
+
+typedef uint64_t IOBufferHandle_t;
+static const uint64_t k_ulInvalidIOBufferHandle = 0;
+	
+	enum EIOBufferError
+	{
+		IOBuffer_Success                  = 0,
+		IOBuffer_OperationFailed          = 100,
+		IOBuffer_InvalidHandle            = 101,
+		IOBuffer_InvalidArgument          = 102,
+		IOBuffer_PathExists               = 103,
+		IOBuffer_PathDoesNotExist         = 104,
+		IOBuffer_Permission               = 105,
+	};
+
+	enum EIOBufferMode
+	{
+		IOBufferMode_Read                 = 0x0001,
+		IOBufferMode_Write                = 0x0002,
+		IOBufferMode_Create               = 0x0200,
+	};
+
+	// ----------------------------------------------------------------------------------------------
+	// Purpose:
+	// ----------------------------------------------------------------------------------------------
+	class IVRIOBuffer
+	{
+	public:
+		/** opens an existing or creates a new IOBuffer of unSize bytes */
+		virtual vr::EIOBufferError Open( const char *pchPath, vr::EIOBufferMode mode, uint32_t unElementSize, uint32_t unElements, vr::IOBufferHandle_t *pulBuffer ) = 0;
+		
+		/** closes a previously opened or created buffer */
+		virtual vr::EIOBufferError Close( vr::IOBufferHandle_t ulBuffer ) = 0;
+		
+		/** reads up to unBytes from buffer into *pDst, returning number of bytes read in *punRead */
+		virtual vr::EIOBufferError Read( vr::IOBufferHandle_t ulBuffer, void *pDst, uint32_t unBytes, uint32_t *punRead ) = 0;
+		
+		/** writes unBytes of data from *pSrc into a buffer. */
+		virtual vr::EIOBufferError Write( vr::IOBufferHandle_t ulBuffer, void *pSrc, uint32_t unBytes ) = 0;
+		
+		/** retrieves the property container of an buffer. */
+		virtual vr::PropertyContainerHandle_t PropertyContainer( vr::IOBufferHandle_t ulBuffer ) = 0;
+	};
+
+	static const char *IVRIOBuffer_Version = "IVRIOBuffer_001";
+}
+// End
+
+#endif // _OPENVR_API
+
+
+namespace vr
+{
+	/** Finds the active installation of the VR API and initializes it. The provided path must be absolute
+	* or relative to the current working directory. These are the local install versions of the equivalent
+	* functions in steamvr.h and will work without a local Steam install.
+	*
+	* This path is to the "root" of the VR API install. That's the directory with
+	* the "drivers" directory and a platform (i.e. "win32") directory in it, not the directory with the DLL itself.
+	*
+	* pStartupInfo is reserved for future use.
+	*/
+	inline IVRSystem *VR_Init( EVRInitError *peError, EVRApplicationType eApplicationType, const char *pStartupInfo = nullptr );
+
+	/** unloads vrclient.dll. Any interface pointers from the interface are
+	* invalid after this point */
+	inline void VR_Shutdown();
+
+	/** Returns true if there is an HMD attached. This check is as lightweight as possible and
+	* can be called outside of VR_Init/VR_Shutdown. It should be used when an application wants
+	* to know if initializing VR is a possibility but isn't ready to take that step yet.
+	*/
+	VR_INTERFACE bool VR_CALLTYPE VR_IsHmdPresent();
+
+	/** Returns true if the OpenVR runtime is installed. */
+	VR_INTERFACE bool VR_CALLTYPE VR_IsRuntimeInstalled();
+
+	/** Returns where the OpenVR runtime is installed. */
+	VR_INTERFACE const char *VR_CALLTYPE VR_RuntimePath();
+
+	/** Returns the name of the enum value for an EVRInitError. This function may be called outside of VR_Init()/VR_Shutdown(). */
+	VR_INTERFACE const char *VR_CALLTYPE VR_GetVRInitErrorAsSymbol( EVRInitError error );
+
+	/** Returns an English string for an EVRInitError. Applications should call VR_GetVRInitErrorAsSymbol instead and
+	* use that as a key to look up their own localized error message. This function may be called outside of VR_Init()/VR_Shutdown(). */
+	VR_INTERFACE const char *VR_CALLTYPE VR_GetVRInitErrorAsEnglishDescription( EVRInitError error );
+
+	/** Returns the interface of the specified version. This method must be called after VR_Init. The
+	* pointer returned is valid until VR_Shutdown is called.
+	*/
+	VR_INTERFACE void *VR_CALLTYPE VR_GetGenericInterface( const char *pchInterfaceVersion, EVRInitError *peError );
+
+	/** Returns whether the interface of the specified version exists.
+	*/
+	VR_INTERFACE bool VR_CALLTYPE VR_IsInterfaceVersionValid( const char *pchInterfaceVersion );
+
+	/** Returns a token that represents whether the VR interface handles need to be reloaded */
+	VR_INTERFACE uint32_t VR_CALLTYPE VR_GetInitToken();
+
+	// These typedefs allow old enum names from SDK 0.9.11 to be used in applications.
+	// They will go away in the future.
+	typedef EVRInitError HmdError;
+	typedef EVREye Hmd_Eye;
+	typedef EColorSpace ColorSpace;
+	typedef ETrackingResult HmdTrackingResult;
+	typedef ETrackedDeviceClass TrackedDeviceClass;
+	typedef ETrackingUniverseOrigin TrackingUniverseOrigin;
+	typedef ETrackedDeviceProperty TrackedDeviceProperty;
+	typedef ETrackedPropertyError TrackedPropertyError;
+	typedef EVRSubmitFlags VRSubmitFlags_t;
+	typedef EVRState VRState_t;
+	typedef ECollisionBoundsStyle CollisionBoundsStyle_t;
+	typedef EVROverlayError VROverlayError;
+	typedef EVRFirmwareError VRFirmwareError;
+	typedef EVRCompositorError VRCompositorError;
+	typedef EVRScreenshotError VRScreenshotsError;
+
+	inline uint32_t &VRToken()
+	{
+		static uint32_t token;
+		return token;
+	}
+
+	class COpenVRContext
+	{
+	public:
+		COpenVRContext() { Clear(); }
+		void Clear();
+
+		inline void CheckClear()
+		{
+			if ( VRToken() != VR_GetInitToken() )
+			{
+				Clear();
+				VRToken() = VR_GetInitToken();
+			}
+		}
+
+		IVRSystem *VRSystem()
+		{
+			CheckClear();
+			if ( m_pVRSystem == nullptr )
+			{
+				EVRInitError eError;
+				m_pVRSystem = ( IVRSystem * )VR_GetGenericInterface( IVRSystem_Version, &eError );
+			}
+			return m_pVRSystem;
+		}
+		IVRChaperone *VRChaperone()
+		{
+			CheckClear();
+			if ( m_pVRChaperone == nullptr )
+			{
+				EVRInitError eError;
+				m_pVRChaperone = ( IVRChaperone * )VR_GetGenericInterface( IVRChaperone_Version, &eError );
+			}
+			return m_pVRChaperone;
+		}
+
+		IVRChaperoneSetup *VRChaperoneSetup()
+		{
+			CheckClear();
+			if ( m_pVRChaperoneSetup == nullptr )
+			{
+				EVRInitError eError;
+				m_pVRChaperoneSetup = ( IVRChaperoneSetup * )VR_GetGenericInterface( IVRChaperoneSetup_Version, &eError );
+			}
+			return m_pVRChaperoneSetup;
+		}
+
+		IVRCompositor *VRCompositor()
+		{
+			CheckClear();
+			if ( m_pVRCompositor == nullptr )
+			{
+				EVRInitError eError;
+				m_pVRCompositor = ( IVRCompositor * )VR_GetGenericInterface( IVRCompositor_Version, &eError );
+			}
+			return m_pVRCompositor;
+		}
+
+		IVROverlay *VROverlay()
+		{
+			CheckClear();
+			if ( m_pVROverlay == nullptr )
+			{
+				EVRInitError eError;
+				m_pVROverlay = ( IVROverlay * )VR_GetGenericInterface( IVROverlay_Version, &eError );
+			}
+			return m_pVROverlay;
+		}
+
+		IVRResources *VRResources()
+		{
+			CheckClear();
+			if ( m_pVRResources == nullptr )
+			{
+				EVRInitError eError;
+				m_pVRResources = (IVRResources *)VR_GetGenericInterface( IVRResources_Version, &eError );
+			}
+			return m_pVRResources;
+		}
+
+		IVRScreenshots *VRScreenshots()
+		{
+			CheckClear();
+			if ( m_pVRScreenshots == nullptr )
+			{
+				EVRInitError eError;
+				m_pVRScreenshots = ( IVRScreenshots * )VR_GetGenericInterface( IVRScreenshots_Version, &eError );
+			}
+			return m_pVRScreenshots;
+		}
+
+		IVRRenderModels *VRRenderModels()
+		{
+			CheckClear();
+			if ( m_pVRRenderModels == nullptr )
+			{
+				EVRInitError eError;
+				m_pVRRenderModels = ( IVRRenderModels * )VR_GetGenericInterface( IVRRenderModels_Version, &eError );
+			}
+			return m_pVRRenderModels;
+		}
+
+		IVRExtendedDisplay *VRExtendedDisplay()
+		{
+			CheckClear();
+			if ( m_pVRExtendedDisplay == nullptr )
+			{
+				EVRInitError eError;
+				m_pVRExtendedDisplay = ( IVRExtendedDisplay * )VR_GetGenericInterface( IVRExtendedDisplay_Version, &eError );
+			}
+			return m_pVRExtendedDisplay;
+		}
+
+		IVRSettings *VRSettings()
+		{
+			CheckClear();
+			if ( m_pVRSettings == nullptr )
+			{
+				EVRInitError eError;
+				m_pVRSettings = ( IVRSettings * )VR_GetGenericInterface( IVRSettings_Version, &eError );
+			}
+			return m_pVRSettings;
+		}
+
+		IVRApplications *VRApplications()
+		{
+			CheckClear();
+			if ( m_pVRApplications == nullptr )
+			{
+				EVRInitError eError;
+				m_pVRApplications = ( IVRApplications * )VR_GetGenericInterface( IVRApplications_Version, &eError );
+			}
+			return m_pVRApplications;
+		}
+
+		IVRTrackedCamera *VRTrackedCamera()
+		{
+			CheckClear();
+			if ( m_pVRTrackedCamera == nullptr )
+			{
+				EVRInitError eError;
+				m_pVRTrackedCamera = ( IVRTrackedCamera * )VR_GetGenericInterface( IVRTrackedCamera_Version, &eError );
+			}
+			return m_pVRTrackedCamera;
+		}
+
+		IVRDriverManager *VRDriverManager()
+		{
+			CheckClear();
+			if ( !m_pVRDriverManager )
+			{
+				EVRInitError eError;
+				m_pVRDriverManager = ( IVRDriverManager * )VR_GetGenericInterface( IVRDriverManager_Version, &eError );
+			}
+			return m_pVRDriverManager;
+		}
+
+		IVRInput *VRInput()
+		{
+			CheckClear();
+			if ( !m_pVRInput )
+			{
+				EVRInitError eError;
+				m_pVRInput = (IVRInput *)VR_GetGenericInterface( IVRInput_Version, &eError );
+			}
+			return m_pVRInput;
+		}
+
+		IVRIOBuffer *VRIOBuffer()
+		{
+			if ( !m_pVRIOBuffer )
+			{
+				EVRInitError eError;
+				m_pVRIOBuffer = ( IVRIOBuffer * )VR_GetGenericInterface( IVRIOBuffer_Version, &eError );
+			}
+			return m_pVRIOBuffer;
+		}
+		
+	private:
+		IVRSystem			*m_pVRSystem;
+		IVRChaperone		*m_pVRChaperone;
+		IVRChaperoneSetup	*m_pVRChaperoneSetup;
+		IVRCompositor		*m_pVRCompositor;
+		IVROverlay			*m_pVROverlay;
+		IVRResources		*m_pVRResources;
+		IVRRenderModels		*m_pVRRenderModels;
+		IVRExtendedDisplay	*m_pVRExtendedDisplay;
+		IVRSettings			*m_pVRSettings;
+		IVRApplications		*m_pVRApplications;
+		IVRTrackedCamera	*m_pVRTrackedCamera;
+		IVRScreenshots		*m_pVRScreenshots;
+		IVRDriverManager	*m_pVRDriverManager;
+		IVRInput			*m_pVRInput;
+		IVRIOBuffer			*m_pVRIOBuffer;
+	};
+
+	inline COpenVRContext &OpenVRInternal_ModuleContext()
+	{
+		static void *ctx[ sizeof( COpenVRContext ) / sizeof( void * ) ];
+		return *( COpenVRContext * )ctx; // bypass zero-init constructor
+	}
+
+	inline IVRSystem *VR_CALLTYPE VRSystem() { return OpenVRInternal_ModuleContext().VRSystem(); }
+	inline IVRChaperone *VR_CALLTYPE VRChaperone() { return OpenVRInternal_ModuleContext().VRChaperone(); }
+	inline IVRChaperoneSetup *VR_CALLTYPE VRChaperoneSetup() { return OpenVRInternal_ModuleContext().VRChaperoneSetup(); }
+	inline IVRCompositor *VR_CALLTYPE VRCompositor() { return OpenVRInternal_ModuleContext().VRCompositor(); }
+	inline IVROverlay *VR_CALLTYPE VROverlay() { return OpenVRInternal_ModuleContext().VROverlay(); }
+	inline IVRScreenshots *VR_CALLTYPE VRScreenshots() { return OpenVRInternal_ModuleContext().VRScreenshots(); }
+	inline IVRRenderModels *VR_CALLTYPE VRRenderModels() { return OpenVRInternal_ModuleContext().VRRenderModels(); }
+	inline IVRApplications *VR_CALLTYPE VRApplications() { return OpenVRInternal_ModuleContext().VRApplications(); }
+	inline IVRSettings *VR_CALLTYPE VRSettings() { return OpenVRInternal_ModuleContext().VRSettings(); }
+	inline IVRResources *VR_CALLTYPE VRResources() { return OpenVRInternal_ModuleContext().VRResources(); }
+	inline IVRExtendedDisplay *VR_CALLTYPE VRExtendedDisplay() { return OpenVRInternal_ModuleContext().VRExtendedDisplay(); }
+	inline IVRTrackedCamera *VR_CALLTYPE VRTrackedCamera() { return OpenVRInternal_ModuleContext().VRTrackedCamera(); }
+	inline IVRDriverManager *VR_CALLTYPE VRDriverManager() { return OpenVRInternal_ModuleContext().VRDriverManager(); }
+	inline IVRInput *VR_CALLTYPE VRInput() { return OpenVRInternal_ModuleContext().VRInput(); }
+	inline IVRIOBuffer *VR_CALLTYPE VRIOBuffer() { return OpenVRInternal_ModuleContext().VRIOBuffer(); }
+
+	inline void COpenVRContext::Clear()
+	{
+		m_pVRSystem = nullptr;
+		m_pVRChaperone = nullptr;
+		m_pVRChaperoneSetup = nullptr;
+		m_pVRCompositor = nullptr;
+		m_pVROverlay = nullptr;
+		m_pVRRenderModels = nullptr;
+		m_pVRExtendedDisplay = nullptr;
+		m_pVRSettings = nullptr;
+		m_pVRApplications = nullptr;
+		m_pVRTrackedCamera = nullptr;
+		m_pVRResources = nullptr;
+		m_pVRScreenshots = nullptr;
+		m_pVRDriverManager = nullptr;
+		m_pVRInput = nullptr;
+		m_pVRIOBuffer = nullptr;
+	}
+	
+	VR_INTERFACE uint32_t VR_CALLTYPE VR_InitInternal2( EVRInitError *peError, EVRApplicationType eApplicationType, const char *pStartupInfo );
+	VR_INTERFACE void VR_CALLTYPE VR_ShutdownInternal();
+
+	/** Finds the active installation of vrclient.dll and initializes it */
+	inline IVRSystem *VR_Init( EVRInitError *peError, EVRApplicationType eApplicationType, const char *pStartupInfo )
+	{
+		IVRSystem *pVRSystem = nullptr;
+
+		EVRInitError eError;
+		VRToken() = VR_InitInternal2( &eError, eApplicationType, pStartupInfo );
+		COpenVRContext &ctx = OpenVRInternal_ModuleContext();
+		ctx.Clear();
+
+		if ( eError == VRInitError_None )
+		{
+			if ( VR_IsInterfaceVersionValid( IVRSystem_Version ) )
+			{
+				pVRSystem = VRSystem();
+			}
+			else
+			{
+				VR_ShutdownInternal();
+				eError = VRInitError_Init_InterfaceNotFound;
+			}
+		}
+
+		if ( peError )
+			*peError = eError;
+		return pVRSystem;
+	}
+
+	/** unloads vrclient.dll. Any interface pointers from the interface are
+	* invalid after this point */
+	inline void VR_Shutdown()
+	{
+		VR_ShutdownInternal();
+	}
+}
\ No newline at end of file