Adding windows 0.3.1 SDK

1 files changed, 911 insertions, 0 deletions

diff --git a/LibOVR/Src/OVR_CAPI.cpp b/LibOVR/Src/OVR_CAPI.cpp
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+++ b/LibOVR/Src/OVR_CAPI.cpp
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+/************************************************************************************
+
+Filename    :   OVR_CAPI.cpp
+Content     :   Experimental simple C interface to the HMD - version 1.
+Created     :   November 30, 2013
+Authors     :   Michael Antonov
+
+Copyright   :   Copyright 2014 Oculus VR, Inc. All Rights reserved.
+
+Licensed under the Oculus VR Rift SDK License Version 3.1 (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-3.1 
+
+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.
+
+************************************************************************************/
+
+#include "OVR_CAPI.h"
+#include "Kernel/OVR_Timer.h"
+#include "Kernel/OVR_Math.h"
+#include "Kernel/OVR_System.h"
+#include "OVR_Stereo.h"
+#include "OVR_Profile.h"
+
+#include "CAPI/CAPI_GlobalState.h"
+#include "CAPI/CAPI_HMDState.h"
+#include "CAPI/CAPI_FrameTimeManager.h"
+
+
+using namespace OVR;
+using namespace OVR::Util::Render;
+
+//-------------------------------------------------------------------------------------
+// Math
+namespace OVR {
+
+
+// ***** FovPort
+
+// C-interop support: FovPort <-> ovrFovPort
+FovPort::FovPort(const ovrFovPort &src)
+    : UpTan(src.UpTan), DownTan(src.DownTan), LeftTan(src.LeftTan), RightTan(src.RightTan)
+{ }    
+
+FovPort::operator const ovrFovPort () const
+{
+    ovrFovPort result;
+    result.LeftTan  = LeftTan;
+    result.RightTan = RightTan;
+    result.UpTan    = UpTan;
+    result.DownTan  = DownTan;
+    return result;
+}
+
+// Converts Fov Tan angle units to [-1,1] render target NDC space
+Vector2f FovPort::TanAngleToRendertargetNDC(Vector2f const &tanEyeAngle)
+{  
+    ScaleAndOffset2D eyeToSourceNDC = CreateNDCScaleAndOffsetFromFov(*this);
+    return tanEyeAngle * eyeToSourceNDC.Scale + eyeToSourceNDC.Offset;
+}
+
+
+// ***** SensorState
+
+SensorState::SensorState(const ovrSensorState& s)
+{
+    Predicted       = s.Predicted;
+    Recorded        = s.Recorded;
+    Temperature     = s.Temperature;
+    StatusFlags     = s.StatusFlags;
+}
+
+SensorState::operator const ovrSensorState() const
+{
+    ovrSensorState result;
+    result.Predicted    = Predicted;
+    result.Recorded     = Recorded;
+    result.Temperature  = Temperature;
+    result.StatusFlags  = StatusFlags;
+    return result;
+}
+
+
+} // namespace OVR
+
+//-------------------------------------------------------------------------------------
+
+using namespace OVR::CAPI;
+
+#ifdef __cplusplus 
+extern "C" {
+#endif
+
+
+// Used to generate projection from ovrEyeDesc::Fov
+OVR_EXPORT ovrMatrix4f ovrMatrix4f_Projection(ovrFovPort fov, float znear, float zfar, ovrBool rightHanded)
+{
+    return CreateProjection(rightHanded ? true : false, fov, znear, zfar);
+}
+
+
+OVR_EXPORT ovrMatrix4f ovrMatrix4f_OrthoSubProjection(ovrMatrix4f projection, ovrVector2f orthoScale,
+                                                      float orthoDistance, float eyeViewAdjustX)
+{
+
+    float orthoHorizontalOffset = eyeViewAdjustX / orthoDistance;
+
+    // Current projection maps real-world vector (x,y,1) to the RT.
+    // We want to find the projection that maps the range [-FovPixels/2,FovPixels/2] to
+    // the physical [-orthoHalfFov,orthoHalfFov]
+    // Note moving the offset from M[0][2]+M[1][2] to M[0][3]+M[1][3] - this means
+    // we don't have to feed in Z=1 all the time.
+    // The horizontal offset math is a little hinky because the destination is
+    // actually [-orthoHalfFov+orthoHorizontalOffset,orthoHalfFov+orthoHorizontalOffset]
+    // So we need to first map [-FovPixels/2,FovPixels/2] to
+    //                         [-orthoHalfFov+orthoHorizontalOffset,orthoHalfFov+orthoHorizontalOffset]:
+    // x1 = x0 * orthoHalfFov/(FovPixels/2) + orthoHorizontalOffset;
+    //    = x0 * 2*orthoHalfFov/FovPixels + orthoHorizontalOffset;
+    // But then we need the sam mapping as the existing projection matrix, i.e.
+    // x2 = x1 * Projection.M[0][0] + Projection.M[0][2];
+    //    = x0 * (2*orthoHalfFov/FovPixels + orthoHorizontalOffset) * Projection.M[0][0] + Projection.M[0][2];
+    //    = x0 * Projection.M[0][0]*2*orthoHalfFov/FovPixels +
+    //      orthoHorizontalOffset*Projection.M[0][0] + Projection.M[0][2];
+    // So in the new projection matrix we need to scale by Projection.M[0][0]*2*orthoHalfFov/FovPixels and
+    // offset by orthoHorizontalOffset*Projection.M[0][0] + Projection.M[0][2].
+
+    Matrix4f ortho;
+    ortho.M[0][0] = projection.M[0][0] * orthoScale.x;
+    ortho.M[0][1] = 0.0f;
+    ortho.M[0][2] = 0.0f;
+    ortho.M[0][3] = -projection.M[0][2] + ( orthoHorizontalOffset * projection.M[0][0] );
+
+    ortho.M[1][0] = 0.0f;
+    ortho.M[1][1] = -projection.M[1][1] * orthoScale.y;       // Note sign flip (text rendering uses Y=down).
+    ortho.M[1][2] = 0.0f;
+    ortho.M[1][3] = -projection.M[1][2];
+
+    /*
+    if ( fabsf ( zNear - zFar ) < 0.001f )
+    {
+        ortho.M[2][0] = 0.0f;
+        ortho.M[2][1] = 0.0f;
+        ortho.M[2][2] = 0.0f;
+        ortho.M[2][3] = zFar;
+    }
+    else
+    {
+        ortho.M[2][0] = 0.0f;
+        ortho.M[2][1] = 0.0f;
+        ortho.M[2][2] = zFar / (zNear - zFar);
+        ortho.M[2][3] = (zFar * zNear) / (zNear - zFar);
+    }
+    */
+
+    // MA: Undo effect of sign
+    ortho.M[2][0] = 0.0f;
+    ortho.M[2][1] = 0.0f;
+    //ortho.M[2][2] = projection.M[2][2] * projection.M[3][2] * -1.0f; // reverse right-handedness
+    ortho.M[2][2] = 0.0f;
+    ortho.M[2][3] = 0.0f;
+        //projection.M[2][3];
+
+    // No perspective correction for ortho.
+    ortho.M[3][0] = 0.0f;
+    ortho.M[3][1] = 0.0f;
+    ortho.M[3][2] = 0.0f;
+    ortho.M[3][3] = 1.0f;
+
+    return ortho;
+}
+
+
+OVR_EXPORT double ovr_GetTimeInSeconds()
+{
+    return Timer::GetSeconds();
+}
+
+// Waits until the specified absolute time.
+OVR_EXPORT double ovr_WaitTillTime(double absTime)
+{
+    volatile int i;
+    double       initialTime = ovr_GetTimeInSeconds();
+    double       newTime     = initialTime;
+    
+    while(newTime < absTime)
+    {
+        for (int j = 0; j < 50; j++)
+            i = 0;
+        newTime = ovr_GetTimeInSeconds();
+    }
+
+    // How long we waited
+    return newTime - initialTime;
+}
+
+//-------------------------------------------------------------------------------------
+
+// 1. Init/shutdown.
+
+static ovrBool CAPI_SystemInitCalled = FALSE;
+
+OVR_EXPORT ovrBool ovr_Initialize()
+{
+    if (OVR::CAPI::GlobalState::pInstance)
+        return TRUE;
+
+    // We must set up the system for the plugin to work
+    if (!OVR::System::IsInitialized())
+    {        
+        OVR::System::Init(OVR::Log::ConfigureDefaultLog(OVR::LogMask_All));
+        CAPI_SystemInitCalled = TRUE;
+    }
+
+    // Constructor detects devices
+    GlobalState::pInstance = new GlobalState;
+    return TRUE;
+}
+
+OVR_EXPORT void ovr_Shutdown()
+{
+    if (!GlobalState::pInstance)
+       return;
+
+    delete GlobalState::pInstance;
+    GlobalState::pInstance = 0;
+
+    // We should clean up the system to be complete
+    if (CAPI_SystemInitCalled)
+    {
+        OVR::System::Destroy();
+        CAPI_SystemInitCalled = FALSE;
+    }    
+    return;
+}
+
+
+// There is a thread safety issue with ovrHmd_Detect in that multiple calls from different
+// threads can corrupt the global array state. This would lead to two problems:
+//  a) Create(index) enumerator may miss or overshoot items. Probably not a big deal
+//     as game logic can easily be written to only do Detect(s)/Creates in one place.
+//     The alternative would be to return list handle.
+//  b) TBD: Un-mutexed Detect access from two threads could lead to crash. We should
+//         probably check this.
+//
+
+OVR_EXPORT int ovrHmd_Detect()
+{
+    if (!GlobalState::pInstance)
+        return 0;
+    return GlobalState::pInstance->EnumerateDevices();
+}
+
+
+// ovrHmd_Create us explicitly separated from StartSensor and Configure to allow creation of 
+// a relatively light-weight handle that would reference the device going forward and would 
+// survive future ovrHmd_Detect calls. That is once ovrHMD is returned, index is no longer
+// necessary and can be changed by a ovrHmd_Detect call.
+
+OVR_EXPORT ovrHmd ovrHmd_Create(int index)
+{
+    if (!GlobalState::pInstance)
+        return 0;
+    Ptr<HMDDevice> device = *GlobalState::pInstance->CreateDevice(index);
+    if (!device)
+        return 0;
+
+    HMDState* hmds = new HMDState(device);
+    if (!hmds)
+        return 0;
+
+    return hmds;
+}
+
+OVR_EXPORT ovrHmd ovrHmd_CreateDebug(ovrHmdType type)
+{
+    if (!GlobalState::pInstance)
+        return 0;    
+
+    HMDState* hmds = new HMDState(type);    
+    return hmds;
+}
+
+OVR_EXPORT void ovrHmd_Destroy(ovrHmd hmd)
+{
+    if (!hmd)
+        return;
+    // TBD: Any extra shutdown?
+    HMDState* hmds = (HMDState*)hmd;
+        
+    {   // Thread checker in its own scope, to avoid access after 'delete'.
+        // Essentially just checks that no other RenderAPI function is executing.
+        ThreadChecker::Scope checkScope(&hmds->RenderAPIThreadChecker, "ovrHmd_Destroy");
+    }    
+
+    delete (HMDState*)hmd;
+}
+
+
+OVR_EXPORT const char* ovrHmd_GetLastError(ovrHmd hmd)
+{
+    using namespace OVR;
+    if (!hmd)
+    {
+        if (!GlobalState::pInstance)  
+            return "LibOVR not initialized.";
+        return GlobalState::pInstance->GetLastError();
+    }
+    HMDState* p = (HMDState*)hmd;
+    return p->GetLastError();
+}
+
+
+//-------------------------------------------------------------------------------------
+// *** Sensor
+
+// Sensor APIs are separated from Create & Configure for several reasons:
+//  - They need custom parameters that control allocation of heavy resources
+//    such as Vision tracking, which you don't want to create unless necessary.
+//  - A game may want to switch some sensor settings based on user input, 
+//    or at lease enable/disable features such as Vision for debugging.
+//  - The same or syntactically similar sensor interface is likely to be used if we 
+//    introduce controllers.
+//
+//  - Sensor interface functions are all Thread-safe, unlike the frame/render API
+//    functions that have different rules (all frame access functions
+//    must be on render thread)
+
+OVR_EXPORT ovrBool ovrHmd_StartSensor(ovrHmd hmd, unsigned int supportedCaps, unsigned int requiredCaps)
+{
+    HMDState* p = (HMDState*)hmd;
+    // TBD: Decide if we null-check arguments.
+    return p->StartSensor(supportedCaps, requiredCaps);
+}
+
+OVR_EXPORT void ovrHmd_StopSensor(ovrHmd hmd)
+{
+    HMDState* p = (HMDState*)hmd;
+    p->StopSensor();
+}
+
+OVR_EXPORT void ovrHmd_ResetSensor(ovrHmd hmd)
+{
+    HMDState* p = (HMDState*)hmd;
+    p->ResetSensor();
+}
+
+OVR_EXPORT ovrSensorState ovrHmd_GetSensorState(ovrHmd hmd, double absTime)
+{
+    HMDState* p = (HMDState*)hmd;
+    return p->PredictedSensorState(absTime);
+}
+
+// Returns information about a sensor. Only valid after SensorStart.
+OVR_EXPORT ovrBool ovrHmd_GetSensorDesc(ovrHmd hmd, ovrSensorDesc* descOut)
+{
+    HMDState* p = (HMDState*)hmd;
+    return p->GetSensorDesc(descOut) ? TRUE : FALSE;
+}
+
+
+
+//-------------------------------------------------------------------------------------
+// *** General Setup
+
+
+OVR_EXPORT void ovrHmd_GetDesc(ovrHmd hmd, ovrHmdDesc* desc)
+{
+    HMDState* hmds = (HMDState*)hmd;    
+    *desc = hmds->RenderState.GetDesc();
+    desc->Handle = hmd;
+}
+
+// Per HMD -> calculateIdealPixelSize
+OVR_EXPORT ovrSizei ovrHmd_GetFovTextureSize(ovrHmd hmd, ovrEyeType eye, ovrFovPort fov,
+                                             float pixelsPerDisplayPixel)
+{
+    if (!hmd) return Sizei(0);
+    
+    HMDState* hmds = (HMDState*)hmd;
+    return hmds->RenderState.GetFOVTextureSize(eye, fov, pixelsPerDisplayPixel);
+}
+
+
+//-------------------------------------------------------------------------------------
+
+
+OVR_EXPORT 
+ovrBool ovrHmd_ConfigureRendering( ovrHmd hmd,
+                                   const ovrRenderAPIConfig* apiConfig,
+                                   unsigned int hmdCaps,
+                                   unsigned int distortionCaps,
+                                   const ovrEyeDesc eyeDescIn[2],
+                                   ovrEyeRenderDesc eyeRenderDescOut[2] )
+{
+    if (!hmd) return FALSE;
+    return ((HMDState*)hmd)->ConfigureRendering(eyeRenderDescOut, eyeDescIn,
+                                                apiConfig, hmdCaps, distortionCaps);
+}
+
+
+
+// TBD: MA - Deprecated, need alternative
+void ovrHmd_SetVsync(ovrHmd hmd, ovrBool vsync)
+{
+    if (!hmd) return;
+
+    return ((HMDState*)hmd)->TimeManager.SetVsync(vsync? true : false);
+}
+
+
+OVR_EXPORT ovrFrameTiming ovrHmd_BeginFrame(ovrHmd hmd, unsigned int frameIndex)
+{           
+    HMDState* hmds = (HMDState*)hmd;
+    if (!hmds)
+    {
+        ovrFrameTiming f;
+        memset(&f, 0, sizeof(f));
+        return f;
+    }
+
+    // Check: Proper configure and threading state for the call.
+    hmds->checkRenderingConfigured("ovrHmd_BeginFrame");
+    OVR_ASSERT_LOG(hmds->BeginFrameCalled == false, ("ovrHmd_BeginFrame called multiple times."));
+    ThreadChecker::Scope checkScope(&hmds->RenderAPIThreadChecker, "ovrHmd_BeginFrame");
+    
+    hmds->BeginFrameCalled   = true;
+    hmds->BeginFrameThreadId = OVR::GetCurrentThreadId();
+
+    return ovrHmd_BeginFrameTiming(hmd, frameIndex);
+}
+
+
+// Renders textures to frame buffer
+OVR_EXPORT void ovrHmd_EndFrame(ovrHmd hmd)
+{
+    HMDState* hmds = (HMDState*)hmd;
+    if (!hmds) return;
+
+    // Debug state checks: Must be in BeginFrame, on the same thread.
+    hmds->checkBeginFrameScope("ovrHmd_EndFrame");
+    ThreadChecker::Scope checkScope(&hmds->RenderAPIThreadChecker, "ovrHmd_EndFrame");  
+
+    // TBD: Move directly into renderer
+    bool dk2LatencyTest = (hmds->HMDInfo.HmdType == HmdType_DK2) &&
+                           (hmds->SensorCaps & ovrHmdCap_LatencyTest);
+    if (dk2LatencyTest)
+    {
+        hmds->LatencyTest2DrawColor[0] = hmds->TimeManager.GetFrameLatencyTestDrawColor();
+        hmds->LatencyTest2DrawColor[1] = hmds->LatencyTest2DrawColor[0];
+        hmds->LatencyTest2DrawColor[2] = hmds->LatencyTest2DrawColor[0];
+    }
+
+    if (hmds->pRenderer)
+    {
+        hmds->pRenderer->EndFrame(true,
+                                  hmds->LatencyTestActive ? hmds->LatencyTestDrawColor : NULL,
+                            
+                                  // MA: Use this color since we are running DK2 test all the time.
+                                  dk2LatencyTest ? hmds->LatencyTest2DrawColor : 0
+                                  //hmds->LatencyTest2Active ? hmds->LatencyTest2DrawColor : NULL
+                                  );
+    }
+    // Call after present
+    ovrHmd_EndFrameTiming(hmd);
+
+    if (dk2LatencyTest)
+    {
+        hmds->TimeManager.UpdateFrameLatencyTrackingAfterEndFrame(
+            hmds->LatencyTest2DrawColor[0], hmds->LatencyUtil2.GetLocklessState());
+    }
+
+    // Out of BeginFrame
+    hmds->BeginFrameThreadId = 0;
+    hmds->BeginFrameCalled   = false;
+}
+
+
+OVR_EXPORT ovrPosef ovrHmd_BeginEyeRender(ovrHmd hmd, ovrEyeType eye)
+{
+    HMDState* hmds = (HMDState*)hmd;
+    if (!hmds) return ovrPosef();
+    return hmds->BeginEyeRender(eye);
+}
+
+OVR_EXPORT void ovrHmd_EndEyeRender(ovrHmd hmd, ovrEyeType eye,
+                                    ovrPosef renderPose, ovrTexture* eyeTexture)
+{
+    HMDState* hmds = (HMDState*)hmd;
+    if (!hmds) return;
+    hmds->EndEyeRender(eye, renderPose, eyeTexture);
+}
+
+
+//-------------------------------------------------------------------------------------
+// ***** Frame Timing logic
+
+
+OVR_EXPORT ovrFrameTiming ovrHmd_GetFrameTiming(ovrHmd hmd, unsigned int frameIndex)
+{
+    ovrFrameTiming f;
+    memset(&f, 0, sizeof(f));
+
+    HMDState* hmds = (HMDState*)hmd;
+    if (hmds)
+    {
+        FrameTimeManager::Timing frameTiming = hmds->TimeManager.GetFrameTiming(frameIndex);
+
+        f.ThisFrameSeconds     = frameTiming.ThisFrameTime;
+        f.NextFrameSeconds       = frameTiming.NextFrameTime;
+        f.TimewarpPointSeconds  = frameTiming.TimewarpPointTime;
+        f.ScanoutMidpointSeconds= frameTiming.MidpointTime;
+        f.EyeScanoutSeconds[0]  = frameTiming.EyeRenderTimes[0];
+        f.EyeScanoutSeconds[1]  = frameTiming.EyeRenderTimes[1];
+
+         // Compute DeltaSeconds.
+        f.DeltaSeconds = (hmds->LastGetFrameTimeSeconds == 0.0f) ? 0.0f :
+                         (float) (f.ThisFrameSeconds - hmds->LastFrameTimeSeconds);    
+        hmds->LastGetFrameTimeSeconds = f.ThisFrameSeconds;
+        if (f.DeltaSeconds > 1.0f)
+            f.DeltaSeconds = 1.0f;
+    }
+        
+    return f;
+}
+
+OVR_EXPORT ovrFrameTiming ovrHmd_BeginFrameTiming(ovrHmd hmd, unsigned int frameIndex)
+{
+    ovrFrameTiming f;
+    memset(&f, 0, sizeof(f));
+
+    HMDState* hmds = (HMDState*)hmd;
+    if (!hmds) return f;
+
+    // Check: Proper state for the call.    
+    OVR_ASSERT_LOG(hmds->BeginFrameTimingCalled == false,
+                    ("ovrHmd_BeginFrameTiming called multiple times."));    
+    hmds->BeginFrameTimingCalled = true;
+
+    double thisFrameTime = hmds->TimeManager.BeginFrame(frameIndex);        
+
+    const FrameTimeManager::Timing &frameTiming = hmds->TimeManager.GetFrameTiming();
+
+    f.ThisFrameSeconds     = thisFrameTime;
+    f.NextFrameSeconds       = frameTiming.NextFrameTime;
+    f.TimewarpPointSeconds  = frameTiming.TimewarpPointTime;
+    f.ScanoutMidpointSeconds= frameTiming.MidpointTime;
+    f.EyeScanoutSeconds[0]  = frameTiming.EyeRenderTimes[0];
+    f.EyeScanoutSeconds[1]  = frameTiming.EyeRenderTimes[1];
+
+    // Compute DeltaSeconds.
+    f.DeltaSeconds = (hmds->LastFrameTimeSeconds == 0.0f) ? 0.0f :
+                     (float) (thisFrameTime - hmds->LastFrameTimeSeconds);    
+    hmds->LastFrameTimeSeconds = thisFrameTime;
+    if (f.DeltaSeconds > 1.0f)
+        f.DeltaSeconds = 1.0f;
+
+    return f;
+}
+
+
+OVR_EXPORT void ovrHmd_EndFrameTiming(ovrHmd hmd)
+{
+    HMDState* hmds = (HMDState*)hmd;
+    if (!hmds) return;
+
+    // Debug state checks: Must be in BeginFrameTiming, on the same thread.
+    hmds->checkBeginFrameTimingScope("ovrHmd_EndTiming");
+   // MA TBD: Correct chek or not?
+   // ThreadChecker::Scope checkScope(&hmds->RenderAPIThreadChecker, "ovrHmd_EndFrame");
+
+    hmds->TimeManager.EndFrame();   
+    hmds->BeginFrameTimingCalled = false;
+}
+
+
+OVR_EXPORT void ovrHmd_ResetFrameTiming(ovrHmd hmd,  unsigned int frameIndex, bool vsync) 
+{
+    HMDState* hmds = (HMDState*)hmd;
+    if (!hmds) return;
+    
+    hmds->TimeManager.ResetFrameTiming(frameIndex, vsync, false,
+                                       hmds->RenderingConfigured);
+    hmds->LastFrameTimeSeconds    = 0.0;
+    hmds->LastGetFrameTimeSeconds = 0.0;
+}
+
+
+
+OVR_EXPORT ovrPosef ovrHmd_GetEyePose(ovrHmd hmd, ovrEyeType eye)
+{
+    HMDState* hmds = (HMDState*)hmd;
+    if (!hmds) return ovrPosef();    
+
+    hmds->checkBeginFrameTimingScope("ovrHmd_GetEyePose");
+    return hmds->TimeManager.GetEyePredictionPose(hmd, eye);
+}
+
+
+OVR_EXPORT void ovrHmd_GetEyeTimewarpMatrices(ovrHmd hmd, ovrEyeType eye,
+                                              ovrPosef renderPose, ovrMatrix4f twmOut[2])
+{
+    HMDState* hmds = (HMDState*)hmd;
+    if (!hmd)
+        return;
+
+    // Debug checks: BeginFrame was called, on the same thread.
+    hmds->checkBeginFrameTimingScope("ovrHmd_GetTimewarpEyeMatrices");   
+
+    hmds->TimeManager.GetTimewarpMatrices(hmd, eye, renderPose, twmOut);
+
+    /*
+    // MA: Took this out because new latency test approach just sames
+    //     the sample times in FrameTimeManager.
+    // TODO: if no timewarp, then test latency in begin eye render
+    if (eye == 0)
+    {        
+        hmds->ProcessLatencyTest2(hmds->LatencyTest2DrawColor, -1.0f);
+    }
+    */
+}
+
+
+
+OVR_EXPORT ovrEyeRenderDesc ovrHmd_GetRenderDesc(ovrHmd hmd, const ovrEyeDesc eyeDesc)
+{
+    ovrEyeRenderDesc erd;
+   
+    HMDState* hmds = (HMDState*)hmd;
+    if (!hmds)
+    {
+        memset(&erd, 0, sizeof(erd));
+        return erd;
+    }
+
+    return hmds->RenderState.calcRenderDesc(eyeDesc);
+}
+
+
+
+#define OVR_OFFSET_OF(s, field) ((size_t)&((s*)0)->field)
+
+
+
+// Generate distortion mesh per eye.
+// scaleAndOffsetOut - this will be needed for shader
+OVR_EXPORT ovrBool ovrHmd_CreateDistortionMesh( ovrHmd hmd, ovrEyeDesc eyeDesc,
+                                                unsigned int distortionCaps,
+                                                ovrVector2f uvScaleOffsetOut[2], 
+                                                ovrDistortionMesh *meshData )
+{
+    if (!meshData)
+        return FALSE;
+    HMDState* hmds = (HMDState*)hmd;
+
+    // Not used now, but Chromatic flag or others could possibly be checked for in the future.
+    OVR_UNUSED1(distortionCaps); 
+    
+    // TBD: We should probably be sharing some C API structures with C++ to avoid this mess...
+    OVR_COMPILER_ASSERT(sizeof(DistortionMeshVertexData)                       == sizeof(ovrDistortionVertex));
+    OVR_COMPILER_ASSERT(OVR_OFFSET_OF(DistortionMeshVertexData, ScreenPosNDC)  == OVR_OFFSET_OF(ovrDistortionVertex, Pos));
+    OVR_COMPILER_ASSERT(OVR_OFFSET_OF(DistortionMeshVertexData, TimewarpLerp)  == OVR_OFFSET_OF(ovrDistortionVertex, TimeWarpFactor));
+    OVR_COMPILER_ASSERT(OVR_OFFSET_OF(DistortionMeshVertexData, Shade)         == OVR_OFFSET_OF(ovrDistortionVertex, VignetteFactor));
+    OVR_COMPILER_ASSERT(OVR_OFFSET_OF(DistortionMeshVertexData, TanEyeAnglesR) == OVR_OFFSET_OF(ovrDistortionVertex, TexR));
+    OVR_COMPILER_ASSERT(OVR_OFFSET_OF(DistortionMeshVertexData, TanEyeAnglesG) == OVR_OFFSET_OF(ovrDistortionVertex, TexG));
+    OVR_COMPILER_ASSERT(OVR_OFFSET_OF(DistortionMeshVertexData, TanEyeAnglesB) == OVR_OFFSET_OF(ovrDistortionVertex, TexB));
+
+
+    // *** Calculate a part of "StereoParams" needed for mesh generation
+
+    // Note that mesh distortion generation is invariant of RenderTarget UVs, allowing
+    // render target size and location to be changed after the fact dynamically. 
+    // eyeToSourceUV is computed here for convenience, so that users don't need
+    // to call ovrHmd_GetRenderScaleAndOffset unless changing RT dynamically.
+
+    
+    const HmdRenderInfo&  hmdri          = hmds->RenderState.RenderInfo;    
+    StereoEye             stereoEye      = (eyeDesc.Eye == ovrEye_Left) ? StereoEye_Left : StereoEye_Right;
+
+    const DistortionRenderDesc& distortion = hmds->RenderState.Distortion[eyeDesc.Eye];
+
+    // Find the mapping from TanAngle space to target NDC space.
+    ScaleAndOffset2D      eyeToSourceNDC = CreateNDCScaleAndOffsetFromFov(eyeDesc.Fov);
+    // Find the mapping from TanAngle space to textureUV space.
+    ScaleAndOffset2D      eyeToSourceUV  = CreateUVScaleAndOffsetfromNDCScaleandOffset(
+                                            eyeToSourceNDC,
+                                            Recti(eyeDesc.RenderViewport), eyeDesc.TextureSize );
+
+    uvScaleOffsetOut[0] = eyeToSourceUV.Scale;
+    uvScaleOffsetOut[1] = eyeToSourceUV.Offset;
+
+    int triangleCount = 0;
+    int vertexCount = 0;
+
+    DistortionMeshCreate((DistortionMeshVertexData**)&meshData->pVertexData, (UInt16**)&meshData->pIndexData,
+                          &vertexCount, &triangleCount,
+                          (stereoEye == StereoEye_Right),
+                          hmdri, distortion, eyeToSourceNDC);
+
+    if (meshData->pVertexData)
+    {
+        // Convert to index
+        meshData->IndexCount = triangleCount * 3;
+        meshData->VertexCount = vertexCount;
+        return TRUE;
+    }
+
+    return FALSE;
+}
+
+
+// Frees distortion mesh allocated by ovrHmd_GenerateDistortionMesh. meshData elements
+// are set to null and 0s after the call.
+OVR_EXPORT void ovrHmd_DestroyDistortionMesh(ovrDistortionMesh* meshData)
+{
+    if (meshData->pVertexData)
+        DistortionMeshDestroy((DistortionMeshVertexData*)meshData->pVertexData,
+                              meshData->pIndexData);
+    meshData->pVertexData = 0;
+    meshData->pIndexData  = 0;
+    meshData->VertexCount = 0;
+    meshData->IndexCount  = 0;
+}
+
+
+
+// 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_EXPORT void ovrHmd_GetRenderScaleAndOffset( ovrHmd hmd, ovrEyeDesc eyeDesc,
+                                                unsigned int distortionCaps,
+                                                ovrVector2f uvScaleOffsetOut[2] )
+{        
+    OVR_UNUSED2(hmd, distortionCaps);
+    // TBD: We could remove dependency on HMD here, but what if we need it in the future?
+    //HMDState*        hmds = (HMDState*)hmd;
+
+    // Find the mapping from TanAngle space to target NDC space.
+    ScaleAndOffset2D  eyeToSourceNDC = CreateNDCScaleAndOffsetFromFov(eyeDesc.Fov);
+    // Find the mapping from TanAngle space to textureUV space.
+    ScaleAndOffset2D  eyeToSourceUV  = CreateUVScaleAndOffsetfromNDCScaleandOffset(
+                                         eyeToSourceNDC,
+                                         eyeDesc.RenderViewport, eyeDesc.TextureSize );
+
+    uvScaleOffsetOut[0] = eyeToSourceUV.Scale;
+    uvScaleOffsetOut[1] = eyeToSourceUV.Offset;
+}
+
+
+//-------------------------------------------------------------------------------------
+// ***** Latency Test interface
+
+OVR_EXPORT ovrBool ovrHmd_GetLatencyTestDrawColor(ovrHmd hmd, unsigned char rgbColorOut[3])
+{
+    HMDState* p = (HMDState*)hmd;
+    rgbColorOut[0] = p->LatencyTestDrawColor[0];
+    rgbColorOut[1] = p->LatencyTestDrawColor[1];
+    rgbColorOut[2] = p->LatencyTestDrawColor[2];
+    return p->LatencyTestActive;
+}
+
+OVR_EXPORT const char*  ovrHmd_GetLatencyTestResult(ovrHmd hmd)
+{
+    HMDState* p = (HMDState*)hmd;
+    return p->LatencyUtil.GetResultsString();
+}
+
+OVR_EXPORT double ovrHmd_GetMeasuredLatencyTest2(ovrHmd hmd)
+{
+    HMDState* p = (HMDState*)hmd;
+
+    // MA Test
+    float latencies[3];
+    p->TimeManager.GetLatencyTimings(latencies);
+    return latencies[2];
+  //  return p->LatencyUtil2.GetMeasuredLatency();
+}
+
+
+// -----------------------------------------------------------------------------------
+// ***** Property Access
+
+OVR_EXPORT float ovrHmd_GetFloat(ovrHmd hmd, const char* propertyName, float defaultVal)
+{
+    HMDState* hmds = (HMDState*)hmd;
+    if (hmds)
+	{
+		return hmds->getFloatValue(propertyName, defaultVal);
+	}
+
+    return defaultVal;
+}
+
+OVR_EXPORT ovrBool ovrHmd_SetFloat(ovrHmd hmd, const char* propertyName, float value)
+{
+    HMDState* hmds = (HMDState*)hmd;
+    if (hmds)
+    {
+        return hmds->setFloatValue(propertyName, value);
+    }
+    return false;
+}
+
+
+
+OVR_EXPORT unsigned int ovrHmd_GetFloatArray(ovrHmd hmd, const char* propertyName,
+                              float values[], unsigned int arraySize)
+{
+    HMDState* hmds = (HMDState*)hmd;
+    if (hmds)
+    {       
+		return hmds->getFloatArray(propertyName, values, arraySize);
+    }
+
+    return 0;
+}
+
+
+// Modify float[] property; false if property doesn't exist or is readonly.
+OVR_EXPORT ovrBool ovrHmd_SetFloatArray(ovrHmd hmd, const char* propertyName,
+                                        float values[], unsigned int arraySize)
+{
+    HMDState* hmds = (HMDState*)hmd;
+    if (hmds)
+    {       
+        return hmds->setFloatArray(propertyName, values, arraySize);
+    }
+
+    return 0;
+}
+
+OVR_EXPORT const char* ovrHmd_GetString(ovrHmd hmd, const char* propertyName,
+                                        const char* defaultVal)
+{
+    HMDState* hmds = (HMDState*)hmd;
+    if (hmds)
+    {
+		return hmds->getString(propertyName, defaultVal);
+    }
+
+    return defaultVal;
+}
+ 
+/* Not needed yet.
+
+// Get array of strings, i.e. const char* [] property.
+// Returns the number of elements filled in, 0 if property doesn't exist.
+// Maximum of arraySize elements will be written.
+// String memory is guaranteed to exist until next call to GetString or GetStringArray, or HMD is destroyed.
+OVR_EXPORT 
+unsigned int ovrHmd_GetStringArray(ovrHmd hmd, const char* propertyName,
+                               const char* values[], unsigned int arraySize)
+{
+    HMDState* hmds = (HMDState*)hmd;
+    if (hmds && hmds->pHMD && arraySize)
+    {        
+        Profile* p = hmds->pHMD->GetProfile();
+
+        hmds->LastGetStringValue[0] = 0;
+        if (p && p->GetValue(propertyName, hmds->LastGetStringValue, sizeof(hmds->LastGetStringValue)))
+        {
+            values[0] = hmds->LastGetStringValue;
+            return 1;
+        }
+    }
+
+    return 0;
+}
+*/
+
+// Returns array size of a property, 0 if property doesn't exist.
+// Can be used to check existence of a property.
+OVR_EXPORT unsigned int ovrHmd_GetArraySize(ovrHmd hmd, const char* propertyName)
+{
+    HMDState* hmds = (HMDState*)hmd;
+    if (hmds && hmds->pHMD)
+    {
+        // For now, just access the profile.
+        Profile* p = hmds->pHMD->GetProfile();
+        
+        if (p)
+            return p->GetNumValues(propertyName);
+    }
+    return 0;
+}
+
+
+#ifdef __cplusplus 
+} // extern "C"
+#endif
+
+
+//-------------------------------------------------------------------------------------
+// ****** Special access for VRConfig
+
+// Return the sensor fusion object for the purposes of magnetometer calibration.  The
+// function is private and is only exposed through VRConfig header declarations
+OVR::SensorFusion* ovrHmd_GetSensorFusion(ovrHmd hmd)
+{
+    HMDState* p = (HMDState*)hmd;
+    return &p->SFusion;
+}
+
+