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Diffstat (limited to 'LibOVR/Include/OVR_CAPI_0_5_0.h')
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diff --git a/LibOVR/Include/OVR_CAPI_0_5_0.h b/LibOVR/Include/OVR_CAPI_0_5_0.h new file mode 100755 index 0000000..c235cba --- /dev/null +++ b/LibOVR/Include/OVR_CAPI_0_5_0.h @@ -0,0 +1,1192 @@ +/************************************************************************************ + +Filename : OVR_CAPI_0_5_0.h +Content : C Interface to Oculus tracking and rendering. +Copyright : Copyright 2014 Oculus VR, LLC All Rights reserved. + +Licensed under the Oculus VR Rift SDK License Version 3.2 (the "License"); +you may not use the Oculus VR Rift SDK except in compliance with the License, +which is provided at the time of installation or download, or which +otherwise accompanies this software in either electronic or hard copy form. + +You may obtain a copy of the License at + +http://www.oculusvr.com/licenses/LICENSE-3.2 + +Unless required by applicable law or agreed to in writing, the Oculus VR SDK +distributed under the License is distributed on an "AS IS" BASIS, +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +See the License for the specific language governing permissions and +limitations under the License. + +************************************************************************************/ + +/// @file OVR_CAPI_0_5_0.h +/// Exposes all general Rift functionality. + +#ifndef OVR_CAPI_h // We don't use version numbers within this, as all versioned variations of +#define OVR_CAPI_h // this file are currently mutually exclusive. + + +#include "OVR_CAPI_Keys.h" +#include "OVR_Version.h" + + +#include <stdint.h> + +#if defined(_MSC_VER) + #pragma warning(push) + #pragma warning(disable: 4324) // structure was padded due to __declspec(align()) +#endif + + + +//----------------------------------------------------------------------------------- +// ***** OVR_OS +// +#if !defined(OVR_OS_WIN32) && defined(_WIN32) + #define OVR_OS_WIN32 +#endif + +#if !defined(OVR_OS_MAC) && defined(__APPLE__) + #define OVR_OS_MAC +#endif + +#if !defined(OVR_OS_LINUX) && defined(__linux__) + #define OVR_OS_LINUX +#endif + + + +//----------------------------------------------------------------------------------- +// ***** OVR_CPP +// +#if !defined(OVR_CPP) + #if defined(__cplusplus) + #define OVR_CPP(x) x + #else + #define OVR_CPP(x) /* Not C++ */ + #endif +#endif + + + +//----------------------------------------------------------------------------------- +// ***** OVR_CDECL +// +// LibOVR calling convention for 32-bit Windows builds. +// +#if !defined(OVR_CDECL) + #if defined(_WIN32) + #define OVR_CDECL __cdecl + #else + #define OVR_CDECL + #endif +#endif + + + +//----------------------------------------------------------------------------------- +// ***** OVR_EXTERN_C +// +// Defined as extern "C" when built from C++ code. +// +#if !defined(OVR_EXTERN_C) + #ifdef __cplusplus + #define OVR_EXTERN_C extern "C" + #else + #define OVR_EXTERN_C + #endif +#endif + + + +//----------------------------------------------------------------------------------- +// ***** OVR_PUBLIC_FUNCTION / OVR_PRIVATE_FUNCTION +// +// OVR_PUBLIC_FUNCTION - Functions that externally visible from a shared library. Corresponds to Microsoft __dllexport. +// OVR_PUBLIC_CLASS - C++ structs and classes that are externally visible from a shared library. Corresponds to Microsoft __dllexport. +// OVR_PRIVATE_FUNCTION - Functions that are not visible outside of a shared library. They are private to the shared library. +// OVR_PRIVATE_CLASS - C++ structs and classes that are not visible outside of a shared library. They are private to the shared library. +// +// OVR_DLL_BUILD - Used to indicate that the current compilation unit is of a shared library. +// OVR_DLL_IMPORT - Used to indicate that the current compilation unit is a user of the corresponding shared library. +// OVR_DLL_BUILD - used to indicate that the current compilation unit is not a shared library but rather statically linked code. +// +#if !defined(OVR_PUBLIC_FUNCTION) + #if defined(OVR_DLL_BUILD) + #if defined(_WIN32) + #define OVR_PUBLIC_FUNCTION(rval) OVR_EXTERN_C __declspec(dllexport) rval OVR_CDECL + #define OVR_PUBLIC_CLASS __declspec(dllexport) + #define OVR_PRIVATE_FUNCTION + #define OVR_PRIVATE_CLASS + #else + #define OVR_PUBLIC_FUNCTION(rval) OVR_EXTERN_C __attribute__((visibility("default"))) rval OVR_CDECL /* Requires GCC 4.0+ */ + #define OVR_PUBLIC_CLASS __attribute__((visibility("default"))) /* Requires GCC 4.0+ */ + #define OVR_PRIVATE_FUNCTION __attribute__((visibility("hidden"))) + #define OVR_PRIVATE_CLASS __attribute__((visibility("hidden"))) + #endif + #elif defined(OVR_DLL_IMPORT) + #if defined(_WIN32) + #define OVR_PUBLIC_FUNCTION(rval) OVR_EXTERN_C __declspec(dllimport) rval OVR_CDECL + #define OVR_PUBLIC_CLASS __declspec(dllimport) + #define OVR_PRIVATE_FUNCTION + #define OVR_PRIVATE_CLASS + #else + #define OVR_PUBLIC_FUNCTION(rval) OVR_EXTERN_C rval OVR_CDECL + #define OVR_PUBLIC_CLASS + #define OVR_PRIVATE_FUNCTION + #define OVR_PRIVATE_CLASS + #endif + #else // OVR_STATIC_BUILD + #define OVR_PUBLIC_FUNCTION(rval) OVR_EXTERN_C rval OVR_CDECL + #define OVR_PUBLIC_CLASS + #define OVR_PRIVATE_FUNCTION + #define OVR_PRIVATE_CLASS + #endif +#endif + + +//----------------------------------------------------------------------------------- +// ***** OVR_EXPORT +// +// Provided for backward compatibility with older usage. + +#if !defined(OVR_EXPORT) + #ifdef OVR_OS_WIN32 + #define OVR_EXPORT __declspec(dllexport) + #else + #define OVR_EXPORT + #endif +#endif + + + +//----------------------------------------------------------------------------------- +// ***** OVR_ALIGNAS +// + +#if !defined(OVR_ALIGNAS) + // C++11 alignas + #if defined(__GNUC__) && (((__GNUC__ * 100) + __GNUC_MINOR__) >= 408) && (defined(__GXX_EXPERIMENTAL_CXX0X__) || (__cplusplus >= 201103L)) + #define OVR_ALIGNAS(n) alignas(n) + #elif defined(__clang__) && !defined(__APPLE__) && (((__clang_major__ * 100) + __clang_minor__) >= 300) && (__cplusplus >= 201103L) + #define OVR_ALIGNAS(n) alignas(n) + #elif defined(__clang__) && defined(__APPLE__) && (((__clang_major__ * 100) + __clang_minor__) >= 401) && (__cplusplus >= 201103L) + #define OVR_ALIGNAS(n) alignas(n) + #elif defined(_MSC_VER) && (_MSC_VER >= 1900) + #define OVR_ALIGNAS(n) alignas(n) + #elif defined(__EDG_VERSION__) && (__EDG_VERSION__ >= 408) + #define OVR_ALIGNAS(n) alignas(n) + + // Pre-C++11 alignas fallbacks + #elif defined(__GNUC__) || defined(__clang__) + #define OVR_ALIGNAS(n) __attribute__((aligned(n))) + #elif defined(_MSC_VER) || defined(__INTEL_COMPILER) + #define OVR_ALIGNAS(n) __declspec(align(n)) // For Microsoft the alignment must be a literal integer. + #elif defined(__CC_ARM) + #define OVR_ALIGNAS(n) __align(n) + #else + #error Need to define OVR_ALIGNAS + #endif +#endif + + +//----------------------------------------------------------------------------------- +// ***** ovrBool + +typedef char ovrBool; +#define ovrFalse 0 +#define ovrTrue 1 + + +//----------------------------------------------------------------------------------- +// ***** Simple Math Structures + +/// A 2D vector with integer components. +typedef struct ovrVector2i_ +{ + int x, y; +} ovrVector2i; + +/// A 2D size with integer components. +typedef struct ovrSizei_ +{ + int w, h; +} ovrSizei; +/// A 2D rectangle with a position and size. +/// All components are integers. +typedef struct ovrRecti_ +{ + ovrVector2i Pos; + ovrSizei Size; +} ovrRecti; + +/// A quaternion rotation. +typedef struct ovrQuatf_ +{ + float x, y, z, w; +} ovrQuatf; + +/// A 2D vector with float components. +typedef struct ovrVector2f_ +{ + float x, y; +} ovrVector2f; + +/// A 3D vector with float components. +typedef struct ovrVector3f_ +{ + float x, y, z; +} ovrVector3f; + +/// A 4x4 matrix with float elements. +typedef struct ovrMatrix4f_ +{ + float M[4][4]; +} ovrMatrix4f; + +/// Position and orientation together. +typedef struct ovrPosef_ +{ + ovrQuatf Orientation; + ovrVector3f Position; +} ovrPosef; + +/// A full pose (rigid body) configuration with first and second derivatives. +typedef struct OVR_ALIGNAS(8) ovrPoseStatef_ +{ + ovrPosef ThePose; ///< The body's position and orientation. + ovrVector3f AngularVelocity; ///< The body's angular velocity in radians per second. + ovrVector3f LinearVelocity; ///< The body's velocity in meters per second. + ovrVector3f AngularAcceleration; ///< The body's angular acceleration in radians per second per second. + ovrVector3f LinearAcceleration; ///< The body's acceleration in meters per second per second. + float Pad; ///< Unused struct padding. + double TimeInSeconds; ///< Absolute time of this state sample. +} ovrPoseStatef; + +/// Field Of View (FOV) in tangent of the angle units. +/// As an example, for a standard 90 degree vertical FOV, we would +/// have: { UpTan = tan(90 degrees / 2), DownTan = tan(90 degrees / 2) }. +typedef struct ovrFovPort_ +{ + float UpTan; ///< The tangent of the angle between the viewing vector and the top edge of the field of view. + float DownTan; ///< The tangent of the angle between the viewing vector and the bottom edge of the field of view. + float LeftTan; ///< The tangent of the angle between the viewing vector and the left edge of the field of view. + float RightTan; ///< The tangent of the angle between the viewing vector and the right edge of the field of view. +} ovrFovPort; + +//----------------------------------------------------------------------------------- +// ***** HMD Types + +/// Enumerates all HMD types that we support. +typedef enum ovrHmdType_ +{ + ovrHmd_None = 0, + ovrHmd_DK1 = 3, + ovrHmd_DKHD = 4, + ovrHmd_DK2 = 6, + ovrHmd_BlackStar = 7, + ovrHmd_CB = 8, + ovrHmd_Other = 9, + ovrHmd_EnumSize = 0x7fffffff ///< Force type int32_t. +} ovrHmdType; + +/// HMD capability bits reported by device. +typedef enum ovrHmdCaps_ +{ + // Read-only flags. + ovrHmdCap_Present = 0x0001, ///< (read only) The HMD is plugged in and detected by the system. + ovrHmdCap_Available = 0x0002, ///< (read only) The HMD and its sensor are available for ownership use. + ///< i.e. it is not already owned by another application. + ovrHmdCap_Captured = 0x0004, ///< (read only) Set to 'true' if we captured ownership of this HMD. + ovrHmdCap_ExtendDesktop = 0x0008, ///< (read only) Means the display driver works via acting as an addition display monitor. + ovrHmdCap_DebugDevice = 0x0010, ///< (read only) Means HMD device is a virtual debug device. + + // Modifiable flags (through ovrHmd_SetEnabledCaps). + ovrHmdCap_NoMirrorToWindow = 0x2000, ///< Disables mirroring of HMD output to the window. This may improve + ///< rendering performance slightly (only if 'ExtendDesktop' is off). + ovrHmdCap_DisplayOff = 0x0040, ///< Turns off HMD screen and output (only if 'ExtendDesktop' is off). + ovrHmdCap_LowPersistence = 0x0080, ///< HMD supports low persistence mode. + ovrHmdCap_DynamicPrediction = 0x0200, ///< Adjust prediction dynamically based on internally measured latency. + ovrHmdCap_NoVSync = 0x1000, ///< Support rendering without VSync for debugging. + + // These bits can be modified by ovrHmd_SetEnabledCaps. + ovrHmdCap_Writable_Mask = ovrHmdCap_NoMirrorToWindow | + ovrHmdCap_DisplayOff | + ovrHmdCap_LowPersistence | + ovrHmdCap_DynamicPrediction | + ovrHmdCap_NoVSync, + + /// These flags are currently passed into the service. May change without notice. + ovrHmdCap_Service_Mask = ovrHmdCap_NoMirrorToWindow | + ovrHmdCap_DisplayOff | + ovrHmdCap_LowPersistence | + ovrHmdCap_DynamicPrediction + , ovrHmdCap_EnumSize = 0x7fffffff ///< Force type int32_t. +} ovrHmdCaps; + + +/// Tracking capability bits reported by the device. +/// Used with ovrHmd_ConfigureTracking. +typedef enum ovrTrackingCaps_ +{ + ovrTrackingCap_Orientation = 0x0010, ///< Supports orientation tracking (IMU). + ovrTrackingCap_MagYawCorrection = 0x0020, ///< Supports yaw drift correction via a magnetometer or other means. + ovrTrackingCap_Position = 0x0040, ///< Supports positional tracking. + /// Overrides the other flags. Indicates that the application + /// doesn't care about tracking settings. This is the internal + /// default before ovrHmd_ConfigureTracking is called. + ovrTrackingCap_Idle = 0x0100, + ovrTrackingCap_EnumSize = 0x7fffffff ///< Force type int32_t. +} ovrTrackingCaps; + +/// Distortion capability bits reported by device. +/// Used with ovrHmd_ConfigureRendering and ovrHmd_CreateDistortionMesh. +typedef enum ovrDistortionCaps_ +{ + // 0x01 unused - Previously ovrDistortionCap_Chromatic now enabled permanently. + ovrDistortionCap_TimeWarp = 0x02, ///< Supports timewarp. + // 0x04 unused + + ovrDistortionCap_Vignette = 0x08, ///< Supports vignetting around the edges of the view. + ovrDistortionCap_NoRestore = 0x10, ///< Do not save and restore the graphics and compute state when rendering distortion. + ovrDistortionCap_FlipInput = 0x20, ///< Flip the vertical texture coordinate of input images. + ovrDistortionCap_SRGB = 0x40, ///< Assume input images are in sRGB gamma-corrected color space. + ovrDistortionCap_Overdrive = 0x80, ///< Overdrive brightness transitions to reduce artifacts on DK2+ displays + ovrDistortionCap_HqDistortion = 0x100, ///< High-quality sampling of distortion buffer for anti-aliasing + ovrDistortionCap_LinuxDevFullscreen = 0x200, ///< Indicates window is fullscreen on a device when set. The SDK will automatically apply distortion mesh rotation if needed. + ovrDistortionCap_ComputeShader = 0x400, ///< Using compute shader (DX11+ only) + //ovrDistortionCap_NoTimewarpJit = 0x800 RETIRED - do not reuse this bit without major versioning changes. + ovrDistortionCap_TimewarpJitDelay = 0x1000, ///< Enables a spin-wait that tries to push time-warp to be as close to V-sync as possible. WARNING - this may backfire and cause framerate loss - use with caution. + + ovrDistortionCap_ProfileNoSpinWaits = 0x10000, ///< Use when profiling with timewarp to remove false positives + ovrDistortionCap_EnumSize = 0x7fffffff ///< Force type int32_t. +} ovrDistortionCaps; + +/// Specifies which eye is being used for rendering. +/// This type explicitly does not include a third "NoStereo" option, as such is +/// not required for an HMD-centered API. +typedef enum ovrEyeType_ +{ + ovrEye_Left = 0, + ovrEye_Right = 1, + ovrEye_Count = 2, + ovrEye_EnumSize = 0x7fffffff ///< Force type int32_t. +} ovrEyeType; + +/// This is a complete descriptor of the HMD. +typedef struct ovrHmdDesc_ +{ + /// Internal handle of this HMD. + struct ovrHmdStruct* Handle; + + /// This HMD's type. + ovrHmdType Type; + + /// Name string describing the product: "Oculus Rift DK1", etc. + const char* ProductName; + /// String describing the manufacturer. Usually "Oculus". + const char* Manufacturer; + + /// HID Vendor ID of the device. + short VendorId; + /// HID Product ID of the device. + short ProductId; + /// Sensor (and display) serial number. + char SerialNumber[24]; + /// Sensor firmware major version number. + short FirmwareMajor; + /// Sensor firmware minor version number. + short FirmwareMinor; + // External tracking camera frustum dimensions (if present). + float CameraFrustumHFovInRadians; ///< Horizontal field-of-view + float CameraFrustumVFovInRadians; ///< Vertical field-of-view + float CameraFrustumNearZInMeters; ///< Near clip distance + float CameraFrustumFarZInMeters; ///< Far clip distance + + /// Capability bits described by ovrHmdCaps. + unsigned int HmdCaps; + /// Capability bits described by ovrTrackingCaps. + unsigned int TrackingCaps; + /// Capability bits described by ovrDistortionCaps. + unsigned int DistortionCaps; + + /// The recommended optical FOV for the HMD. + ovrFovPort DefaultEyeFov[ovrEye_Count]; + /// The maximum optical FOV for the HMD. + ovrFovPort MaxEyeFov[ovrEye_Count]; + + /// Preferred eye rendering order for best performance. + /// Can help reduce latency on sideways-scanned screens. + ovrEyeType EyeRenderOrder[ovrEye_Count]; + + /// Resolution of the full HMD screen (both eyes) in pixels. + ovrSizei Resolution; + /// Location of the application window on the desktop (or 0,0). + ovrVector2i WindowsPos; + + /// Display that the HMD should present on. + /// TBD: It may be good to remove this information relying on WindowPos instead. + /// Ultimately, we may need to come up with a more convenient alternative, + /// such as API-specific functions that return adapter, or something that will + /// work with our monitor driver. + /// Windows: (e.g. "\\\\.\\DISPLAY3", can be used in EnumDisplaySettings/CreateDC). + const char* DisplayDeviceName; + /// MacOS: + int DisplayId; + +} ovrHmdDesc; + +/// Simple type ovrHmd is used in ovrHmd_* calls. +typedef const ovrHmdDesc * ovrHmd; + +/// Bit flags describing the current status of sensor tracking. +// The values must be the same as in enum StatusBits +typedef enum ovrStatusBits_ +{ + ovrStatus_OrientationTracked = 0x0001, ///< Orientation is currently tracked (connected and in use). + ovrStatus_PositionTracked = 0x0002, ///< Position is currently tracked (false if out of range). + ovrStatus_CameraPoseTracked = 0x0004, ///< Camera pose is currently tracked. + ovrStatus_PositionConnected = 0x0020, ///< Position tracking hardware is connected. + ovrStatus_HmdConnected = 0x0080, ///< HMD Display is available and connected. + ovrStatus_EnumSize = 0x7fffffff ///< Force type int32_t. +} ovrStatusBits; + +/// Specifies a reading we can query from the sensor. +typedef struct ovrSensorData_ +{ + ovrVector3f Accelerometer; /// Acceleration reading in m/s^2. + ovrVector3f Gyro; /// Rotation rate in rad/s. + ovrVector3f Magnetometer; /// Magnetic field in Gauss. + float Temperature; /// Temperature of the sensor in degrees Celsius. + float TimeInSeconds; /// Time when the reported IMU reading took place, in seconds. +} ovrSensorData; + + +/// Tracking state at a given absolute time (describes predicted HMD pose etc). +/// Returned by ovrHmd_GetTrackingState. +typedef struct ovrTrackingState_ +{ + /// Predicted head pose (and derivatives) at the requested absolute time. + /// The look-ahead interval is equal to (HeadPose.TimeInSeconds - RawSensorData.TimeInSeconds). + ovrPoseStatef HeadPose; + + /// Current pose of the external camera (if present). + /// This pose includes camera tilt (roll and pitch). For a leveled coordinate + /// system use LeveledCameraPose. + ovrPosef CameraPose; + + /// Camera frame aligned with gravity. + /// This value includes position and yaw of the camera, but not roll and pitch. + /// It can be used as a reference point to render real-world objects in the correct location. + ovrPosef LeveledCameraPose; + + /// The most recent sensor data received from the HMD. + ovrSensorData RawSensorData; + + /// Tracking status described by ovrStatusBits. + unsigned int StatusFlags; + + /// Tag the vision processing results to a certain frame counter number. + uint32_t LastCameraFrameCounter; + + /// Unused struct padding. + uint32_t Pad; +} ovrTrackingState; + + + +/// Frame timing data reported by ovrHmd_BeginFrameTiming() or ovrHmd_BeginFrame(). +typedef struct OVR_ALIGNAS(8) ovrFrameTiming_ +{ + /// The amount of time that has passed since the previous frame's + /// ThisFrameSeconds value (usable for movement scaling). + /// This will be clamped to no more than 0.1 seconds to prevent + /// excessive movement after pauses due to loading or initialization. + float DeltaSeconds; + + /// Unused struct padding. + float Pad; + + /// It is generally expected that the following holds: + /// ThisFrameSeconds < TimewarpPointSeconds < NextFrameSeconds < + /// EyeScanoutSeconds[EyeOrder[0]] <= ScanoutMidpointSeconds <= EyeScanoutSeconds[EyeOrder[1]]. + + /// Absolute time value when rendering of this frame began or is expected to + /// begin. Generally equal to NextFrameSeconds of the previous frame. Can be used + /// for animation timing. + double ThisFrameSeconds; + + /// Absolute point when IMU expects to be sampled for this frame. + double TimewarpPointSeconds; + + /// Absolute time when frame Present followed by GPU Flush will finish and the next frame begins. + double NextFrameSeconds; + + /// Time when half of the screen will be scanned out. Can be passed as an absolute time + /// to ovrHmd_GetTrackingState() to get the predicted general orientation. + double ScanoutMidpointSeconds; + + /// Timing points when each eye will be scanned out to display. Used when rendering each eye. + double EyeScanoutSeconds[2]; +} ovrFrameTiming; + +/// Rendering information for each eye. Computed by either ovrHmd_ConfigureRendering() +/// or ovrHmd_GetRenderDesc() based on the specified FOV. Note that the rendering viewport +/// is not included here as it can be specified separately and modified per frame through: +/// (a) ovrHmd_GetRenderScaleAndOffset in the case of client rendered distortion, +/// or (b) passing different values via ovrTexture in the case of SDK rendered distortion. +typedef struct ovrEyeRenderDesc_ +{ + ovrEyeType Eye; ///< The eye index this instance corresponds to. + ovrFovPort Fov; ///< The field of view. + ovrRecti DistortedViewport; ///< Distortion viewport. + ovrVector2f PixelsPerTanAngleAtCenter; ///< How many display pixels will fit in tan(angle) = 1. + ovrVector3f HmdToEyeViewOffset; ///< Translation to be applied to view matrix for each eye offset. +} ovrEyeRenderDesc; + +/// Rendering information for positional TimeWarp. +/// Contains the data necessary to properly calculate position info for timewarp matrices +/// and also interpret depth info provided via the depth buffer to the timewarp shader +typedef struct ovrPositionTimewarpDesc_ +{ + /// The same offset value pair provided in ovrEyeRenderDesc. + ovrVector3f HmdToEyeViewOffset[2]; + /// The near clip distance used in the projection matrix. + float NearClip; + /// The far clip distance used in the projection matrix + /// utilized when rendering the eye depth textures provided in ovrHmd_EndFrame + float FarClip; +} ovrPositionTimewarpDesc; + +//----------------------------------------------------------------------------------- +// ***** Platform-independent Rendering Configuration + +/// These types are used to hide platform-specific details when passing +/// render device, OS, and texture data to the API. +/// +/// The benefit of having these wrappers versus platform-specific API functions is +/// that they allow game glue code to be portable. A typical example is an +/// engine that has multiple back ends, say GL and D3D. Portable code that calls +/// these back ends may also use LibOVR. To do this, back ends can be modified +/// to return portable types such as ovrTexture and ovrRenderAPIConfig. +typedef enum ovrRenderAPIType_ +{ +#if !defined(HEADLESS_APP) + ovrRenderAPI_None, + ovrRenderAPI_OpenGL, + ovrRenderAPI_Android_GLES, // May include extra native window pointers, etc. + ovrRenderAPI_D3D9, // Deprecated: Not supported for SDK rendering + ovrRenderAPI_D3D10, // Deprecated: Not supported for SDK rendering + ovrRenderAPI_D3D11, + ovrRenderAPI_Count, + ovrRenderAPI_EnumSize = 0x7fffffff ///< Force type int32_t. +#else /* !defined(HEADLESS_APP) */ + ovrRenderAPI_None, + ovrRenderAPI_Count, + ovrRenderAPI_EnumSize = 0x7fffffff ///< Force type int32_t. +#endif /* !defined(HEADLESS_APP) */ +} ovrRenderAPIType; + +/// Platform-independent part of rendering API-configuration data. +/// It is a part of ovrRenderAPIConfig, passed to ovrHmd_Configure. +typedef struct ovrRenderAPIConfigHeader_ +{ + ovrRenderAPIType API; ///< The graphics API in use. + ovrSizei BackBufferSize; ///< Previously named RTSize. + int Multisample; ///< The number of samples per pixel. +} ovrRenderAPIConfigHeader; + +/// Contains platform-specific information for rendering. +typedef struct ovrRenderAPIConfig_ +{ + ovrRenderAPIConfigHeader Header; ///< Platform-independent rendering information. + uintptr_t PlatformData[8]; ///< Platform-specific rendering information. +} ovrRenderAPIConfig; + +/// Platform-independent part of the eye texture descriptor. +/// It is a part of ovrTexture, passed to ovrHmd_EndFrame. +/// If RenderViewport is all zeros then the full texture will be used. +typedef struct ovrTextureHeader_ +{ + ovrRenderAPIType API; ///< The graphics API in use. + ovrSizei TextureSize; ///< The size of the texture. + ovrRecti RenderViewport; ///< Pixel viewport in texture that holds eye image. +} ovrTextureHeader; + +/// Contains platform-specific information about a texture. +/// Specialized for different rendering APIs in: +/// ovrGLTexture, ovrD3D11Texture +typedef struct ovrTexture_ +{ + ovrTextureHeader Header; ///< Platform-independent data about the texture. + uintptr_t PlatformData[8]; ///< Specialized in ovrGLTextureData, ovrD3D11TextureData etc. +} ovrTexture; + + +// ----------------------------------------------------------------------------------- +// ***** API Interfaces + +// Basic steps to use the API: +// +// Setup: +// * ovrInitialize() +// * ovrHMD hmd = ovrHmd_Create(0) +// * Use hmd members and ovrHmd_GetFovTextureSize() to determine graphics configuration. +// * Call ovrHmd_ConfigureTracking() to configure and initialize tracking. +// * Call ovrHmd_ConfigureRendering() to setup graphics for SDK rendering, +// which is the preferred approach. +// Please refer to "Client Distortion Rendering" below if you prefer to do that instead. +// * If the ovrHmdCap_ExtendDesktop flag is not set, then use ovrHmd_AttachToWindow to +// associate the relevant application window with the hmd. +// * Allocate render target textures as needed. +// +// Game Loop: +// * Call ovrHmd_BeginFrame() to get the current frame timing information. +// * Render each eye using ovrHmd_GetEyePoses() to get each eye pose. +// * Call ovrHmd_EndFrame() to render the distorted textures to the back buffer +// and present them on the hmd. +// +// Shutdown: +// * ovrHmd_Destroy(hmd) +// * ovr_Shutdown() +// + +#ifdef __cplusplus +extern "C" { +#endif + + +#if !defined(HEADLESS_APP) +/// ovr_InitializeRenderingShim initializes the rendering shim apart from everything +/// else in LibOVR. This may be helpful if the application prefers to avoid +/// creating any OVR resources (allocations, service connections, etc) at this point. +/// ovr_InitializeRenderingShim does not bring up anything within LibOVR except the +/// necessary hooks to enable the Direct-to-Rift functionality. +/// +/// Either ovr_InitializeRenderingShim() or ovr_Initialize() must be called before any +/// Direct3D or OpenGL initialization is done by application (creation of devices, etc). +/// ovr_Initialize() must still be called after to use the rest of LibOVR APIs. +/// +/// Same as ovr_InitializeRenderingShim except it requests to support at least the +/// given minor LibOVR library version. +OVR_PUBLIC_FUNCTION(ovrBool) ovr_InitializeRenderingShimVersion(int requestedMinorVersion); + +OVR_PUBLIC_FUNCTION(ovrBool) ovr_InitializeRenderingShim(); +#endif /* !defined(HEADLESS_APP) */ + + +/// Library init/shutdown, must be called around all other OVR code. +/// No other functions calls besides ovr_InitializeRenderingShim are allowed before +/// ovr_Initialize succeeds or after ovr_Shutdown. +/// Initializes all Oculus functionality. +/// A second call to ovr_Initialize after successful second call returns ovrTrue. + +/// Flags for Initialize() +typedef enum ovrInitFlags_ +{ + // When a debug library is requested, a slower debugging version of the library will + // be run which can be used to help solve problems in the library and debug game code. + ovrInit_Debug = 0x00000001, + + // When ServerOptional is set, the ovr_Initialize() call not will block waiting for + // the server to respond. If the server is not reachable it may still succeed. + ovrInit_ServerOptional = 0x00000002, + + // When a version is requested, LibOVR runtime will respect the RequestedMinorVersion + // field and will verify that the RequestedMinorVersion is supported. + ovrInit_RequestVersion = 0x00000004, + + // Forces debug features of LibOVR off explicitly, even if it is built in debug mode. + ovrInit_ForceNoDebug = 0x00000008, + +} ovrInitFlags; + +/// Logging levels +typedef enum ovrLogLevel_ +{ + ovrLogLevel_Debug = 0, + ovrLogLevel_Info = 1, + ovrLogLevel_Error = 2 +} ovrLogLevel; + +/// Signature for the logging callback. +/// Level is one of the ovrLogLevel constants. +typedef void (OVR_CDECL *ovrLogCallback)(int level, const char* message); + +/// Parameters for the ovr_Initialize() call. +typedef struct +{ + /// Flags from ovrInitFlags to override default behavior. + /// Pass 0 for the defaults. + uint32_t Flags; ///< Combination of ovrInitFlags or 0 + + /// Request a specific minimum minor version of the LibOVR runtime. + /// Flags must include ovrInit_RequestVersion or this will be ignored. + uint32_t RequestedMinorVersion; + + /// Log callback function, which may be called at any time asynchronously from + /// multiple threads until ovr_Shutdown() completes. + /// Pass 0 for no log callback. + ovrLogCallback LogCallback; ///< Function pointer or 0 + + /// Number of milliseconds to wait for a connection to the server. + /// Pass 0 for the default timeout. + uint32_t ConnectionTimeoutMS; ///< Timeout in Milliseconds or 0 +} ovrInitParams; + +/// Initialize with extra parameters. +/// Pass 0 to initialize with default parameters, suitable for released games. +/// LibOVRRT shared library search order: +/// 1) Current working directory (often the same as the application directory). +/// 2) Module directory (usually the same as the application directory, but not if the module is a separate shared library). +/// 3) Application directory +/// 4) Development directory (only if OVR_ENABLE_DEVELOPER_SEARCH is enabled, which is off by default). +/// 5) Standard OS shared library search location(s) (OS-specific). +OVR_PUBLIC_FUNCTION(ovrBool) ovr_Initialize(ovrInitParams const* params OVR_CPP(= 0)); + +/// Shuts down all Oculus functionality. +OVR_PUBLIC_FUNCTION(void) ovr_Shutdown(); + +/// Returns version string representing libOVR version. Static, so +/// string remains valid for app lifespan +OVR_PUBLIC_FUNCTION(const char*) ovr_GetVersionString(); + +/// Detects or re-detects HMDs and reports the total number detected. +/// Users can get information about each HMD by calling ovrHmd_Create with an index. +/// Returns -1 when the service is unreachable. +OVR_PUBLIC_FUNCTION(int) ovrHmd_Detect(); + +/// Creates a handle to an HMD which doubles as a description structure. +/// Index can [0 .. ovrHmd_Detect()-1]. Index mappings can cange after each ovrHmd_Detect call. +/// If not null, then the returned handle must be freed with ovrHmd_Destroy. +OVR_PUBLIC_FUNCTION(ovrHmd) ovrHmd_Create(int index); +OVR_PUBLIC_FUNCTION(void) ovrHmd_Destroy(ovrHmd hmd); + +/// Creates a 'fake' HMD used for debugging only. This is not tied to specific hardware, +/// but may be used to debug some of the related rendering. +OVR_PUBLIC_FUNCTION(ovrHmd) ovrHmd_CreateDebug(ovrHmdType type); + +/// Returns last error for HMD state. Returns null for no error. +/// String is valid until next call or GetLastError or HMD is destroyed. +/// Pass null hmd to get global errors (during create etc). +OVR_PUBLIC_FUNCTION(const char*) ovrHmd_GetLastError(ovrHmd hmd); + +#if !defined(HEADLESS_APP) +/// Platform specific function to specify the application window whose output will be +/// displayed on the HMD. Only used if the ovrHmdCap_ExtendDesktop flag is false. +/// Windows: SwapChain associated with this window will be displayed on the HMD. +/// Specify 'destMirrorRect' in window coordinates to indicate an area +/// of the render target output that will be mirrored from 'sourceRenderTargetRect'. +/// Null pointers mean "full size". +/// @note Source and dest mirror rects are not yet implemented. +OVR_PUBLIC_FUNCTION(ovrBool) ovrHmd_AttachToWindow(ovrHmd hmd, void* window, + const ovrRecti* destMirrorRect, + const ovrRecti* sourceRenderTargetRect); +#endif /* !defined(HEADLESS_APP) */ + +/// Returns capability bits that are enabled at this time as described by ovrHmdCaps. +/// Note that this value is different font ovrHmdDesc::HmdCaps, which describes what +/// capabilities are available for that HMD. +OVR_PUBLIC_FUNCTION(unsigned int) ovrHmd_GetEnabledCaps(ovrHmd hmd); + +/// Modifies capability bits described by ovrHmdCaps that can be modified, +/// such as ovrHmdCap_LowPersistance. +OVR_PUBLIC_FUNCTION(void) ovrHmd_SetEnabledCaps(ovrHmd hmd, unsigned int hmdCaps); + +//------------------------------------------------------------------------------------- +// ***** Tracking Interface + +/// All tracking interface functions are thread-safe, allowing tracking state to be sampled +/// from different threads. +/// ConfigureTracking starts sensor sampling, enabling specified capabilities, +/// described by ovrTrackingCaps. +/// - supportedTrackingCaps specifies support that is requested. The function will succeed +/// even if these caps are not available (i.e. sensor or camera is unplugged). Support +/// will automatically be enabled if such device is plugged in later. Software should +/// check ovrTrackingState.StatusFlags for real-time status. +/// - requiredTrackingCaps specify sensor capabilities required at the time of the call. +/// If they are not available, the function will fail. Pass 0 if only specifying +/// supportedTrackingCaps. +/// - Pass 0 for both supportedTrackingCaps and requiredTrackingCaps to disable tracking. +OVR_PUBLIC_FUNCTION(ovrBool) ovrHmd_ConfigureTracking(ovrHmd hmd, unsigned int supportedTrackingCaps, + unsigned int requiredTrackingCaps); + +/// Re-centers the sensor orientation. +/// Normally this will recenter the (x,y,z) translational components and the yaw +/// component of orientation. +OVR_PUBLIC_FUNCTION(void) ovrHmd_RecenterPose(ovrHmd hmd); + +/// Returns tracking state reading based on the specified absolute system time. +/// Pass an absTime value of 0.0 to request the most recent sensor reading. In this case +/// both PredictedPose and SamplePose will have the same value. +/// ovrHmd_GetEyePoses relies on a valid ovrTrackingState. +/// This may also be used for more refined timing of FrontBuffer rendering logic, etc. +OVR_PUBLIC_FUNCTION(ovrTrackingState) ovrHmd_GetTrackingState(ovrHmd hmd, double absTime); + + + + + +//------------------------------------------------------------------------------------- +// ***** Graphics Setup + +/// Calculates the recommended viewport size for rendering a given eye within the HMD +/// with a given FOV cone. Higher FOV will generally require larger textures to +/// maintain quality. +/// - pixelsPerDisplayPixel specifies the ratio of the number of render target pixels +/// to display pixels at the center of distortion. 1.0 is the default value. Lower +/// values can improve performance, higher values give improved quality. +/// Apps packing multiple eye views together on the same textue should ensure there is +/// roughly 8 pixels of padding between them to prevent texture filtering and chromatic +/// aberration causing images to "leak" between the two eye views. +OVR_PUBLIC_FUNCTION(ovrSizei) ovrHmd_GetFovTextureSize(ovrHmd hmd, ovrEyeType eye, ovrFovPort fov, + float pixelsPerDisplayPixel); + +//------------------------------------------------------------------------------------- +// ***** Rendering API Thread Safety + +// All of rendering functions including the configure and frame functions +// are *NOT thread safe*. It is ok to use ConfigureRendering on one thread and handle +// frames on another thread, but explicit synchronization must be done since +// functions that depend on configured state are not reentrant. +// +// As an extra requirement, any of the following calls must be done on +// the render thread, which is the same thread that calls ovrHmd_BeginFrame +// or ovrHmd_BeginFrameTiming. +// - ovrHmd_EndFrame +// - ovrHmd_GetEyeTimewarpMatrices + +//------------------------------------------------------------------------------------- +// ***** SDK Distortion Rendering Functions + +// These functions support rendering of distortion by the SDK through direct +// access to the underlying rendering API, such as D3D or GL. +// This is the recommended approach since it allows better support for future +// Oculus hardware, and enables a range of low-level optimizations. + +/// Configures rendering and fills in computed render parameters. +/// This function can be called multiple times to change rendering settings. +/// eyeRenderDescOut is a pointer to an array of two ovrEyeRenderDesc structs +/// that are used to return complete rendering information for each eye. +/// - apiConfig provides D3D/OpenGL specific parameters. Pass null +/// to shutdown rendering and release all resources. +/// - distortionCaps describe desired distortion settings. +OVR_PUBLIC_FUNCTION(ovrBool) ovrHmd_ConfigureRendering(ovrHmd hmd, + const ovrRenderAPIConfig* apiConfig, + unsigned int distortionCaps, + const ovrFovPort eyeFovIn[2], + ovrEyeRenderDesc eyeRenderDescOut[2] ); + + +/// Begins a frame, returning timing information. +/// This should be called at the beginning of the game rendering loop (on the render thread). +/// Pass 0 for the frame index if not using ovrHmd_GetFrameTiming. +OVR_PUBLIC_FUNCTION(ovrFrameTiming) ovrHmd_BeginFrame(ovrHmd hmd, unsigned int frameIndex); + +/// Ends a frame, submitting the rendered textures to the frame buffer. +/// - RenderViewport within each eyeTexture can change per frame if necessary. +/// - 'renderPose' will typically be the value returned from ovrHmd_GetEyePoses +/// but can be different if a different head pose was used for rendering. +/// - This may perform distortion and scaling internally, assuming is it not +/// delegated to another thread. +/// - Must be called on the same thread as BeginFrame. +/// - If ovrDistortionCap_DepthProjectedTimeWarp is enabled, then app must provide eyeDepthTexture +/// and posTimewarpDesc. Otherwise both can be NULL. +/// - *** This Function will call Present/SwapBuffers and potentially wait for GPU Sync ***. +OVR_PUBLIC_FUNCTION(void) ovrHmd_EndFrame(ovrHmd hmd, + const ovrPosef renderPose[2], + const ovrTexture eyeTexture[2]); + +/// Returns predicted head pose in outHmdTrackingState and offset eye poses in outEyePoses +/// as an atomic operation. Caller need not worry about applying HmdToEyeViewOffset to the +/// returned outEyePoses variables. +/// - Thread-safe function where caller should increment frameIndex with every frame +/// and pass the index where applicable to functions called on the rendering thread. +/// - hmdToEyeViewOffset[2] can be ovrEyeRenderDesc.HmdToEyeViewOffset returned from +/// ovrHmd_ConfigureRendering or ovrHmd_GetRenderDesc. For monoscopic rendering, +/// use a vector that is the average of the two vectors for both eyes. +/// - If frameIndex is not being utilized, pass in 0. +/// - Assuming outEyePoses are used for rendering, it should be passed into ovrHmd_EndFrame. +/// - If caller doesn't need outHmdTrackingState, it can be passed in as NULL +OVR_PUBLIC_FUNCTION(void) ovrHmd_GetEyePoses(ovrHmd hmd, unsigned int frameIndex, + const ovrVector3f hmdToEyeViewOffset[2], + ovrPosef outEyePoses[2], + ovrTrackingState* outHmdTrackingState); + +/// Function was previously called ovrHmd_GetEyePose +/// Returns the predicted head pose to use when rendering the specified eye. +/// - Important: Caller must apply HmdToEyeViewOffset before using ovrPosef for rendering +/// - Must be called between ovrHmd_BeginFrameTiming and ovrHmd_EndFrameTiming. +/// - If returned pose is used for rendering the eye, it should be passed to ovrHmd_EndFrame. +/// - Parameter 'eye' is used internally for prediction timing only +OVR_PUBLIC_FUNCTION(ovrPosef) ovrHmd_GetHmdPosePerEye(ovrHmd hmd, ovrEyeType eye); + + +//------------------------------------------------------------------------------------- +// ***** Client Distortion Rendering Functions + +// These functions provide the distortion data and render timing support necessary to allow +// client rendering of distortion. Client-side rendering involves the following steps: +// +// 1. Setup ovrEyeDesc based on the desired texture size and FOV. +// Call ovrHmd_GetRenderDesc to get the necessary rendering parameters for each eye. +// +// 2. Use ovrHmd_CreateDistortionMesh to generate the distortion mesh. +// +// 3. Use ovrHmd_BeginFrameTiming, ovrHmd_GetEyePoses, and ovrHmd_BeginFrameTiming in +// the rendering loop to obtain timing and predicted head orientation when rendering each eye. +// - When using timewarp, use ovr_WaitTillTime after the rendering and gpu flush, followed +// by ovrHmd_GetEyeTimewarpMatrices to obtain the timewarp matrices used +// by the distortion pixel shader. This will minimize latency. +// + +/// Computes the distortion viewport, view adjust, and other rendering parameters for +/// the specified eye. This can be used instead of ovrHmd_ConfigureRendering to do +/// setup for client rendered distortion. +OVR_PUBLIC_FUNCTION(ovrEyeRenderDesc) ovrHmd_GetRenderDesc(ovrHmd hmd, + ovrEyeType eyeType, ovrFovPort fov); + + +/// Describes a vertex used by the distortion mesh. This is intended to be converted into +/// the engine-specific format. Some fields may be unused based on the ovrDistortionCaps +/// flags selected. TexG and TexB, for example, are not used if chromatic correction is +/// not requested. +typedef struct ovrDistortionVertex_ +{ + ovrVector2f ScreenPosNDC; ///< [-1,+1],[-1,+1] over the entire framebuffer. + float TimeWarpFactor; ///< Lerp factor between time-warp matrices. Can be encoded in Pos.z. + float VignetteFactor; ///< Vignette fade factor. Can be encoded in Pos.w. + ovrVector2f TanEyeAnglesR; ///< The tangents of the horizontal and vertical eye angles for the red channel. + ovrVector2f TanEyeAnglesG; ///< The tangents of the horizontal and vertical eye angles for the green channel. + ovrVector2f TanEyeAnglesB; ///< The tangents of the horizontal and vertical eye angles for the blue channel. +} ovrDistortionVertex; + +/// Describes a full set of distortion mesh data, filled in by ovrHmd_CreateDistortionMesh. +/// Contents of this data structure, if not null, should be freed by ovrHmd_DestroyDistortionMesh. +typedef struct ovrDistortionMesh_ +{ + ovrDistortionVertex* pVertexData; ///< The distortion vertices representing each point in the mesh. + unsigned short* pIndexData; ///< Indices for connecting the mesh vertices into polygons. + unsigned int VertexCount; ///< The number of vertices in the mesh. + unsigned int IndexCount; ///< The number of indices in the mesh. +} ovrDistortionMesh; + +/// Generate distortion mesh per eye. +/// Distortion capabilities will depend on 'distortionCaps' flags. Users should +/// render using the appropriate shaders based on their settings. +/// Distortion mesh data will be allocated and written into the ovrDistortionMesh data structure, +/// which should be explicitly freed with ovrHmd_DestroyDistortionMesh. +/// Users should call ovrHmd_GetRenderScaleAndOffset to get uvScale and Offset values for rendering. +/// The function shouldn't fail unless theres is a configuration or memory error, in which case +/// ovrDistortionMesh values will be set to null. +/// This is the only function in the SDK reliant on eye relief, currently imported from profiles, +/// or overridden here. +OVR_PUBLIC_FUNCTION(ovrBool) ovrHmd_CreateDistortionMesh(ovrHmd hmd, + ovrEyeType eyeType, ovrFovPort fov, + unsigned int distortionCaps, + ovrDistortionMesh *meshData); +OVR_PUBLIC_FUNCTION(ovrBool) ovrHmd_CreateDistortionMeshDebug(ovrHmd hmddesc, + ovrEyeType eyeType, ovrFovPort fov, + unsigned int distortionCaps, + ovrDistortionMesh *meshData, + float debugEyeReliefOverrideInMetres); + + +/// Used to free the distortion mesh allocated by ovrHmd_GenerateDistortionMesh. meshData elements +/// are set to null and zeroes after the call. +OVR_PUBLIC_FUNCTION(void) ovrHmd_DestroyDistortionMesh(ovrDistortionMesh* meshData); + +/// Computes updated 'uvScaleOffsetOut' to be used with a distortion if render target size or +/// viewport changes after the fact. This can be used to adjust render size every frame if desired. +OVR_PUBLIC_FUNCTION(void) ovrHmd_GetRenderScaleAndOffset(ovrFovPort fov, + ovrSizei textureSize, ovrRecti renderViewport, + ovrVector2f uvScaleOffsetOut[2] ); + +/// Thread-safe timing function for the main thread. Caller should increment frameIndex +/// with every frame and pass the index where applicable to functions called on the +/// rendering thread. +OVR_PUBLIC_FUNCTION(ovrFrameTiming) ovrHmd_GetFrameTiming(ovrHmd hmd, unsigned int frameIndex); + +/// Called at the beginning of the frame on the rendering thread. +/// Pass frameIndex == 0 if ovrHmd_GetFrameTiming isn't being used. Otherwise, +/// pass the same frame index as was used for GetFrameTiming on the main thread. +OVR_PUBLIC_FUNCTION(ovrFrameTiming) ovrHmd_BeginFrameTiming(ovrHmd hmd, unsigned int frameIndex); + +/// Marks the end of client distortion rendered frame, tracking the necessary timing information. +/// This function must be called immediately after Present/SwapBuffers + GPU sync. GPU sync is +/// important before this call to reduce latency and ensure proper timing. +OVR_PUBLIC_FUNCTION(void) ovrHmd_EndFrameTiming(ovrHmd hmd); + +/// Initializes and resets frame time tracking. This is typically not necessary, but +/// is helpful if game changes vsync state or video mode. vsync is assumed to be on if this +/// isn't called. Resets internal frame index to the specified number. +OVR_PUBLIC_FUNCTION(void) ovrHmd_ResetFrameTiming(ovrHmd hmd, unsigned int frameIndex); + +/// Computes timewarp matrices used by distortion mesh shader, these are used to adjust +/// for head orientation change since the last call to ovrHmd_GetEyePoses +/// when rendering this eye. The ovrDistortionVertex::TimeWarpFactor is used to blend between the +/// matrices, usually representing two different sides of the screen. +/// Set 'calcPosition' to true when using depth based positional timewarp +/// Must be called on the same thread as ovrHmd_BeginFrameTiming. +OVR_PUBLIC_FUNCTION(void) ovrHmd_GetEyeTimewarpMatrices(ovrHmd hmd, ovrEyeType eye, ovrPosef renderPose, + ovrMatrix4f twmOut[2]); +OVR_PUBLIC_FUNCTION(void) ovrHmd_GetEyeTimewarpMatricesDebug(ovrHmd hmddesc, ovrEyeType eye, ovrPosef renderPose, + ovrQuatf playerTorsoMotion, ovrMatrix4f twmOut[2], + double debugTimingOffsetInSeconds); + + + + +//------------------------------------------------------------------------------------- +// ***** Stateless math setup functions + +/// Returns global, absolute high-resolution time in seconds. This is the same +/// value as used in sensor messages. +OVR_PUBLIC_FUNCTION(double) ovr_GetTimeInSeconds(); + + +// ----------------------------------------------------------------------------------- +// ***** Latency Test interface + +/// Does latency test processing and returns 'TRUE' if specified rgb color should +/// be used to clear the screen. +OVR_PUBLIC_FUNCTION(ovrBool) ovrHmd_ProcessLatencyTest(ovrHmd hmd, unsigned char rgbColorOut[3]); + +/// Returns non-null string once with latency test result, when it is available. +/// Buffer is valid until next call. +OVR_PUBLIC_FUNCTION(const char*) ovrHmd_GetLatencyTestResult(ovrHmd hmd); + +/// Returns the latency testing color in rgbColorOut to render when using a DK2 +/// Returns false if this feature is disabled or not-applicable (e.g. using a DK1) +OVR_PUBLIC_FUNCTION(ovrBool) ovrHmd_GetLatencyTest2DrawColor(ovrHmd hmddesc, unsigned char rgbColorOut[3]); + +//------------------------------------------------------------------------------------- +// ***** Health and Safety Warning Display interface +// + +#if !defined(HEADLESS_APP) + +/// Used by ovrhmd_GetHSWDisplayState to report the current display state. +typedef struct OVR_ALIGNAS(8) ovrHSWDisplayState_ +{ + /// If true then the warning should be currently visible + /// and the following variables have meaning. Else there is no + /// warning being displayed for this application on the given HMD. + ovrBool Displayed; ///< True if the Health&Safety Warning is currently displayed. + char Pad[8-sizeof(ovrBool)]; ///< Unused struct padding. + double StartTime; ///< Absolute time when the warning was first displayed. See ovr_GetTimeInSeconds(). + double DismissibleTime; ///< Earliest absolute time when the warning can be dismissed. May be a time in the past. +} ovrHSWDisplayState; + +/// Returns the current state of the HSW display. If the application is doing the rendering of +/// the HSW display then this function serves to indicate that the warning should be +/// currently displayed. If the application is using SDK-based eye rendering then the SDK by +/// default automatically handles the drawing of the HSW display. An application that uses +/// application-based eye rendering should use this function to know when to start drawing the +/// HSW display itself and can optionally use it in conjunction with ovrhmd_DismissHSWDisplay +/// as described below. +/// +/// Example usage for application-based rendering: +/// bool HSWDisplayCurrentlyDisplayed = false; // global or class member variable +/// ovrHSWDisplayState hswDisplayState; +/// ovrhmd_GetHSWDisplayState(Hmd, &hswDisplayState); +/// +/// if (hswDisplayState.Displayed && !HSWDisplayCurrentlyDisplayed) { +/// <insert model into the scene that stays in front of the user> +/// HSWDisplayCurrentlyDisplayed = true; +/// } +OVR_PUBLIC_FUNCTION(void) ovrHmd_GetHSWDisplayState(ovrHmd hmd, ovrHSWDisplayState *hasWarningState); + +/// Requests a dismissal of the HSWDisplay at the earliest possible time, which may be seconds +/// into the future due to display longevity requirements. +/// Returns true if the display is valid, in which case the request can always be honored. +/// +/// Example usage : +/// void ProcessEvent(int key) { +/// if (key == escape) +/// ovrhmd_DismissHSWDisplay(hmd); +/// } +OVR_PUBLIC_FUNCTION(ovrBool) ovrHmd_DismissHSWDisplay(ovrHmd hmd); + +#endif /* !defined(HEADLESS_APP) */ + +/// Get boolean property. Returns first element if property is a boolean array. +/// Returns defaultValue if property doesn't exist. +OVR_PUBLIC_FUNCTION(ovrBool) ovrHmd_GetBool(ovrHmd hmd, const char* propertyName, ovrBool defaultVal); + +/// Modify bool property; false if property doesn't exist or is readonly. +OVR_PUBLIC_FUNCTION(ovrBool) ovrHmd_SetBool(ovrHmd hmd, const char* propertyName, ovrBool value); + +/// Get integer property. Returns first element if property is an integer array. +/// Returns defaultValue if property doesn't exist. +OVR_PUBLIC_FUNCTION(int) ovrHmd_GetInt(ovrHmd hmd, const char* propertyName, int defaultVal); + +/// Modify integer property; false if property doesn't exist or is readonly. +OVR_PUBLIC_FUNCTION(ovrBool) ovrHmd_SetInt(ovrHmd hmd, const char* propertyName, int value); + +/// Get float property. Returns first element if property is a float array. +/// Returns defaultValue if property doesn't exist. +OVR_PUBLIC_FUNCTION(float) ovrHmd_GetFloat(ovrHmd hmd, const char* propertyName, float defaultVal); + +/// Modify float property; false if property doesn't exist or is readonly. +OVR_PUBLIC_FUNCTION(ovrBool) ovrHmd_SetFloat(ovrHmd hmd, const char* propertyName, float value); + +/// Get float[] property. Returns the number of elements filled in, 0 if property doesn't exist. +/// Maximum of arraySize elements will be written. +OVR_PUBLIC_FUNCTION(unsigned int) ovrHmd_GetFloatArray(ovrHmd hmd, const char* propertyName, + float values[], unsigned int arraySize); + +/// Modify float[] property; false if property doesn't exist or is readonly. +OVR_PUBLIC_FUNCTION(ovrBool) ovrHmd_SetFloatArray(ovrHmd hmd, const char* propertyName, + float values[], unsigned int arraySize); + +/// Get string property. Returns first element if property is a string array. +/// Returns defaultValue if property doesn't exist. +/// String memory is guaranteed to exist until next call to GetString or GetStringArray, or HMD is destroyed. +OVR_PUBLIC_FUNCTION(const char*) ovrHmd_GetString(ovrHmd hmd, const char* propertyName, + const char* defaultVal); + +/// Set string property +OVR_PUBLIC_FUNCTION(ovrBool) ovrHmd_SetString(ovrHmd hmddesc, const char* propertyName, + const char* value); + +// ----------------------------------------------------------------------------------- +// ***** Logging + +/// Send a message string to the system tracing mechanism if enabled (currently Event Tracing for Windows) +/// Level is one of the ovrLogLevel constants. +/// returns the length of the message, or -1 if message is too large +OVR_PUBLIC_FUNCTION(int) ovr_TraceMessage(int level, const char* message); + + +// DEPRECATED: These functions are being phased out in favor of a more comprehensive logging system. +// These functions will return false and do nothing. +OVR_PUBLIC_FUNCTION(ovrBool) ovrHmd_StartPerfLog(ovrHmd hmd, const char* fileName, const char* userData1); +OVR_PUBLIC_FUNCTION(ovrBool) ovrHmd_StopPerfLog(ovrHmd hmd); + + +#ifdef __cplusplus +} // extern "C" +#endif + + +#if defined(_MSC_VER) + #pragma warning(pop) +#endif + + + +// ----------------------------------------------------------------------------------- +// ***** Backward compatibility #includes +// +// This is at the bottom of this file because the following is dependent on the +// declarations above. + +#if !defined(OVR_CAPI_NO_UTILS) + #include "OVR_CAPI_Util.h" +#endif + + +#endif // OVR_CAPI_h |