added linux makefile

modules/oculus_sdk_linux/LibOVR/Src/CAPI/CAPI_HMDState.cpp

@@ -0,0 +1,804 @@
+/************************************************************************************
+
+Filename    :   CAPI_HMDState.cpp
+Content     :   State associated with a single HMD
+Created     :   January 24, 2014
+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 "CAPI_HMDState.h"
+#include "CAPI_GlobalState.h"
+#include "../OVR_Profile.h"
+
+namespace OVR { namespace CAPI {
+
+//-------------------------------------------------------------------------------------
+// ***** HMDState
+
+
+HMDState::HMDState(HMDDevice* device)
+    : pHMD(device), HMDInfoW(device), HMDInfo(HMDInfoW.h),    
+      EnabledHmdCaps(0), HmdCapsAppliedToSensor(0),
+      SensorStarted(0), SensorCreated(0), SensorCaps(0),
+      AddSensorCount(0), AddLatencyTestCount(0), AddLatencyTestDisplayCount(0),
+      RenderState(getThis(), pHMD->GetProfile(), HMDInfoW.h),
+      LastFrameTimeSeconds(0.0f), LastGetFrameTimeSeconds(0.0),
+      LatencyTestActive(false),
+      LatencyTest2Active(false)
+{
+    pLastError = 0;
+    GlobalState::pInstance->AddHMD(this);
+    
+    // Should be in renderer?
+    TimeManager.Init(RenderState.RenderInfo);
+
+    EyeRenderActive[0] = false;
+    EyeRenderActive[1] = false;
+
+    LatencyTestDrawColor[0] = 0;
+    LatencyTestDrawColor[1] = 0;
+    LatencyTestDrawColor[2] = 0;
+
+    OVR_CAPI_VISION_CODE( pPoseTracker = 0; )
+
+    RenderingConfigured = false;
+    BeginFrameCalled    = false;
+    BeginFrameThreadId  = 0;
+    BeginFrameTimingCalled = false;
+}
+
+HMDState::HMDState(ovrHmdType hmdType)
+  : pHMD(0), HMDInfoW(hmdType), HMDInfo(HMDInfoW.h),
+    EnabledHmdCaps(0),
+    SensorStarted(0), SensorCreated(0), SensorCaps(0),
+    AddSensorCount(0), AddLatencyTestCount(0), AddLatencyTestDisplayCount(0),
+    RenderState(getThis(), 0, HMDInfoW.h), // No profile. 
+    LastFrameTimeSeconds(0.0), LastGetFrameTimeSeconds(0.0)
+{
+    // TBD: We should probably be looking up the default profile for the given
+    // device type + user.
+
+    pLastError = 0;
+    GlobalState::pInstance->AddHMD(this);
+
+    // Should be in renderer?
+    TimeManager.Init(RenderState.RenderInfo);
+
+    EyeRenderActive[0] = false;
+    EyeRenderActive[1] = false;
+
+    OVR_CAPI_VISION_CODE( pPoseTracker = 0; )
+
+    RenderingConfigured = false;
+    BeginFrameCalled   = false;
+    BeginFrameThreadId = 0;
+    BeginFrameTimingCalled = false;
+}
+
+
+HMDState::~HMDState()
+{
+    OVR_ASSERT(GlobalState::pInstance);
+   
+    StopSensor();
+    ConfigureRendering(0,0,0,0);
+
+    OVR_CAPI_VISION_CODE( OVR_ASSERT(pPoseTracker == 0); )
+
+    GlobalState::pInstance->RemoveHMD(this);
+}
+
+
+
+//-------------------------------------------------------------------------------------
+// *** Sensor 
+
+bool HMDState::StartSensor(unsigned supportedCaps, unsigned requiredCaps)
+{
+    Lock::Locker lockScope(&DevicesLock);
+
+    bool crystalCoveOrBetter = (HMDInfo.HmdType == HmdType_CrystalCoveProto) ||
+                               (HMDInfo.HmdType == HmdType_DK2);
+    bool sensorCreatedJustNow = false;
+
+    // TBD: In case of sensor not being immediately available, it would be good to check
+    //      yaw config availability to match it with ovrHmdCap_YawCorrection requirement.
+    // 
+
+    if (!crystalCoveOrBetter)
+    {
+        if (requiredCaps & ovrSensorCap_Position)
+        {
+            pLastError = "ovrSensorCap_Position not supported on this HMD.";
+            return false;            
+        }
+    }
+
+    supportedCaps |= requiredCaps;
+
+    if (pHMD && !pSensor)
+    {
+        // Zero AddSensorCount before creation, in case it fails (or succeeds but then
+        // immediately gets disconnected) followed by another Add notification.        
+        AddSensorCount      = 0;
+        pSensor             = *pHMD->GetSensor();
+        sensorCreatedJustNow= true;
+
+        if (pSensor)
+        {
+            pSensor->SetReportRate(500);
+            SFusion.AttachToSensor(pSensor);
+            applyProfileToSensorFusion();
+        }
+        else
+        {
+            if (requiredCaps & ovrSensorCap_Orientation)
+            {
+                pLastError = "Failed to create sensor.";
+                return false;
+            }
+        }
+    }
+
+
+    if ((requiredCaps & ovrSensorCap_YawCorrection) && !pSensor->IsMagCalibrated())
+    {
+        pLastError = "ovrHmdCap_YawCorrection not available.";
+        if (sensorCreatedJustNow)
+        {
+            SFusion.AttachToSensor(0);
+            SFusion.Reset();
+            pSensor.Clear();
+        }
+        return false;
+    }        
+
+    SFusion.SetYawCorrectionEnabled((supportedCaps & ovrSensorCap_YawCorrection) != 0);
+
+    if (pSensor && sensorCreatedJustNow)
+    {
+        LogText("Sensor created.\n");
+        SensorCreated = true;
+    }
+
+    updateDK2FeaturesTiedToSensor(sensorCreatedJustNow);    
+    
+
+#ifdef OVR_CAPI_VISIONSUPPORT
+
+    if (crystalCoveOrBetter && (supportedCaps & ovrSensorCap_Position))
+    {
+        if (!pPoseTracker)
+        {
+            pPoseTracker = new Vision::PoseTracker(SFusion);
+            if (pPoseTracker)
+            {
+                pPoseTracker->AssociateHMD(pSensor);
+                LogText("Sensor Pose tracker created.\n");
+            }
+        }
+
+        // TBD: How do we verify that position tracking is actually available
+        //      i.e. camera is plugged in?
+    }
+    else if (pPoseTracker)
+    {
+        // TBD: Internals not thread safe - must fix!!
+        delete pPoseTracker;
+        pPoseTracker = 0;
+        LogText("Sensor Pose tracker destroyed.\n");
+    }
+
+#endif // OVR_CAPI_VISIONSUPPORT
+
+    SensorCaps    = supportedCaps;
+    SensorStarted = true;
+
+    return true;
+}
+
+
+// Stops sensor sampling, shutting down internal resources.
+void HMDState::StopSensor()
+{
+    Lock::Locker lockScope(&DevicesLock);
+
+    if (SensorStarted)
+    {
+#ifdef OVR_CAPI_VISIONSUPPORT
+        if (pPoseTracker)
+        {
+            // TBD: Internals not thread safe - must fix!!
+            delete pPoseTracker;
+            pPoseTracker = 0;
+            LogText("Sensor Pose tracker destroyed.\n");
+        }        
+#endif // OVR_CAPI_VISION_CODE
+
+        SFusion.AttachToSensor(0);
+        SFusion.Reset();
+        pSensor.Clear();
+        HmdCapsAppliedToSensor = 0;
+        AddSensorCount = 0;
+        SensorCaps     = 0;
+        SensorCreated  = false;
+        SensorStarted  = false;
+
+        LogText("StopSensor succeeded.\n");
+    }
+}
+
+// Resets sensor orientation.
+void HMDState::ResetSensor()
+{
+    SFusion.Reset();
+}
+
+
+// Returns prediction for time.
+ovrSensorState HMDState::PredictedSensorState(double absTime)
+{    
+    SensorState ss;
+
+    // We are trying to keep this path lockless unless we are notified of new device
+    // creation while not having a sensor yet. It's ok to check SensorCreated volatile
+    // flag here, since GetSensorStateAtTime() is internally lockless and safe.
+
+    if (SensorCreated || checkCreateSensor())
+    {   
+        ss = SFusion.GetSensorStateAtTime(absTime);
+
+        if (!(ss.StatusFlags & ovrStatus_OrientationTracked))
+        {
+            Lock::Locker lockScope(&DevicesLock);
+
+#ifdef OVR_CAPI_VISIONSUPPORT
+            if (pPoseTracker)
+            {
+                // TBD: Internals not thread safe - must fix!!
+                delete pPoseTracker;
+                pPoseTracker = 0;
+                LogText("Sensor Pose tracker destroyed.\n");
+            }        
+#endif // OVR_CAPI_VISION_CODE
+            // Not needed yet; SFusion.AttachToSensor(0);
+            // This seems to reset orientation anyway...
+            pSensor.Clear();
+            SensorCreated = false;         
+            HmdCapsAppliedToSensor = 0;
+        }
+    }
+    else
+    {
+        // SensorState() defaults to 0s.
+        // ss.Pose.Orientation       = Quatf();
+        // ..
+
+        // John:
+        // We still want valid times so frames will get a delta-time
+        // and allow operation with a joypad when the sensor isn't
+        // connected.
+        ss.Recorded.TimeInSeconds  = absTime;
+        ss.Predicted.TimeInSeconds = absTime;
+    }
+
+    ss.StatusFlags |= ovrStatus_HmdConnected;
+    return ss;
+}
+
+
+bool  HMDState::checkCreateSensor()
+{
+    if (!(SensorStarted && !SensorCreated && AddSensorCount))
+        return false;
+
+    Lock::Locker lockScope(&DevicesLock);
+
+    // Re-check condition once in the lock, in case the state changed.
+    if (SensorStarted && !SensorCreated && AddSensorCount)
+    {        
+        if (pHMD)
+        {
+            AddSensorCount = 0;
+            pSensor        = *pHMD->GetSensor();
+        }
+
+        if (pSensor)
+        {
+            pSensor->SetReportRate(500);
+            SFusion.AttachToSensor(pSensor);
+            SFusion.SetYawCorrectionEnabled((SensorCaps & ovrSensorCap_YawCorrection) != 0);
+            applyProfileToSensorFusion();
+
+#ifdef OVR_CAPI_VISIONSUPPORT
+            if (SensorCaps & ovrSensorCap_Position)
+            {
+                pPoseTracker = new Vision::PoseTracker(SFusion);
+                if (pPoseTracker)
+                {
+                    pPoseTracker->AssociateHMD(pSensor);
+                }
+                LogText("Sensor Pose tracker created.\n");
+            }
+#endif // OVR_CAPI_VISION_CODE
+
+            LogText("Sensor created.\n");
+
+            SensorCreated = true;
+            return true;
+        }
+    }
+
+    return SensorCreated;
+}
+
+bool HMDState::GetSensorDesc(ovrSensorDesc* descOut)
+{
+    Lock::Locker lockScope(&DevicesLock);
+
+    if (SensorCreated)
+    {
+        OVR_ASSERT(pSensor);
+        OVR::SensorInfo si;
+        pSensor->GetDeviceInfo(&si);
+        descOut->VendorId  = si.VendorId;
+        descOut->ProductId = si.ProductId;
+        OVR_ASSERT(si.SerialNumber.GetSize() <= sizeof(descOut->SerialNumber));
+        OVR_strcpy(descOut->SerialNumber, sizeof(descOut->SerialNumber), si.SerialNumber.ToCStr());
+        return true;
+    }
+    return false;
+}
+
+
+void HMDState::applyProfileToSensorFusion()
+{
+    if (!pHMD)
+        return;
+    Profile* profile = pHMD->GetProfile();
+    if (!profile)
+    {
+        OVR_ASSERT(false);
+        return;
+    }
+    SFusion.SetUserHeadDimensions ( *profile, RenderState.RenderInfo );
+}
+
+void HMDState::updateLowPersistenceMode(bool lowPersistence) const
+{
+	OVR_ASSERT(pSensor);
+	DisplayReport dr;
+    
+    if (pSensor.GetPtr())
+    {
+	    pSensor->GetDisplayReport(&dr);
+
+	    dr.Persistence = (UInt16) (dr.TotalRows * (lowPersistence ? 0.18f : 1.0f));
+	    dr.Brightness = lowPersistence ? 255 : 0;
+    
+	    pSensor->SetDisplayReport(dr);
+    }
+}
+
+void HMDState::updateLatencyTestForHmd(bool latencyTesting)
+{
+    if (pSensor.GetPtr())
+    {
+        DisplayReport dr;
+        pSensor->GetDisplayReport(&dr);
+
+        dr.ReadPixel = latencyTesting;
+
+        pSensor->SetDisplayReport(dr);
+    }
+
+    if (latencyTesting)
+    {
+        LatencyUtil2.SetSensorDevice(pSensor.GetPtr());
+    }
+    else
+    {
+        LatencyUtil2.SetSensorDevice(NULL);
+    }
+}
+
+
+void HMDState::updateDK2FeaturesTiedToSensor(bool sensorCreatedJustNow)
+{
+    Lock::Locker lockScope(&DevicesLock);
+
+    if (!SensorCreated || (HMDInfo.HmdType != HmdType_DK2))
+        return;
+
+    // Only send display reports if state changed or sensor initializing first time.
+    if (sensorCreatedJustNow ||
+         ((HmdCapsAppliedToSensor ^ EnabledHmdCaps) & ovrHmdCap_LowPersistence))
+    {
+        updateLowPersistenceMode((EnabledHmdCaps & ovrHmdCap_LowPersistence) ? true : false);         
+    }
+
+    if (sensorCreatedJustNow || ((HmdCapsAppliedToSensor ^ EnabledHmdCaps) & ovrHmdCap_LatencyTest))
+    {
+        updateLatencyTestForHmd((EnabledHmdCaps & ovrHmdCap_LatencyTest) != 0);
+    }
+
+    HmdCapsAppliedToSensor = EnabledHmdCaps & (ovrHmdCap_LowPersistence|ovrHmdCap_LatencyTest);
+}
+
+
+
+void HMDState::SetEnabledHmdCaps(unsigned hmdCaps)
+{
+    
+    if (HMDInfo.HmdType == HmdType_DK2)
+    {
+        if ((EnabledHmdCaps ^ hmdCaps) & ovrHmdCap_DynamicPrediction)
+        {
+            // DynamicPrediction change
+            TimeManager.ResetFrameTiming(TimeManager.GetFrameTiming().FrameIndex,
+                                         (hmdCaps & ovrHmdCap_DynamicPrediction) ? true : false,
+                                         RenderingConfigured);
+        }
+    }
+
+    if ((EnabledHmdCaps ^ hmdCaps) & ovrHmdCap_NoVSync)
+    {
+        TimeManager.SetVsync((hmdCaps & ovrHmdCap_NoVSync) ? false : true);
+    }
+
+
+    EnabledHmdCaps             = hmdCaps & ovrHmdCap_Writable_Mask;
+    RenderState.EnabledHmdCaps = EnabledHmdCaps;
+
+    // Unfortunately, LowPersistance and other flags are tied to sensor.
+    // This flag will apply the state of sensor is created; otherwise this will be delayed
+    // till StartSensor.
+    // Such behavior is less then ideal, but should be resolved with the service model.
+
+    updateDK2FeaturesTiedToSensor(false);
+}
+
+
+//-------------------------------------------------------------------------------------
+// ***** Property Access
+
+// TBD: This all needs to be cleaned up and organized into namespaces.
+
+float HMDState::getFloatValue(const char* propertyName, float defaultVal)
+{
+	if (OVR_strcmp(propertyName, "LensSeparation") == 0)
+	{
+		return HMDInfo.LensSeparationInMeters;
+	}
+    else if (OVR_strcmp(propertyName, "CenterPupilDepth") == 0)
+    {        
+        return SFusion.GetCenterPupilDepth();
+    }
+	else if (pHMD)
+	{
+		Profile* p = pHMD->GetProfile();
+		if (p)
+		{
+			return p->GetFloatValue(propertyName, defaultVal);
+		}
+	}
+	return defaultVal;
+}
+
+bool HMDState::setFloatValue(const char* propertyName, float value)
+{
+    if (OVR_strcmp(propertyName, "CenterPupilDepth") == 0)
+    {
+        SFusion.SetCenterPupilDepth(value);
+        return true;
+    }
+    return false;
+}
+
+
+static unsigned CopyFloatArrayWithLimit(float dest[], unsigned destSize,
+                                        float source[], unsigned sourceSize)
+{
+    unsigned count = Alg::Min(destSize, sourceSize);
+    for (unsigned i = 0; i < count; i++)
+        dest[i] = source[i];
+    return count;
+}
+
+
+unsigned HMDState::getFloatArray(const char* propertyName, float values[], unsigned arraySize)
+{
+	if (arraySize)
+	{
+		if (OVR_strcmp(propertyName, "ScreenSize") == 0)
+		{
+            float data[2] = { HMDInfo.ScreenSizeInMeters.w, HMDInfo.ScreenSizeInMeters.h };
+
+            return CopyFloatArrayWithLimit(values, arraySize, data, 2);
+		}
+        else if (OVR_strcmp(propertyName, "DistortionClearColor") == 0)
+        {
+            return CopyFloatArrayWithLimit(values, arraySize, RenderState.ClearColor, 4);
+        }
+        else if (OVR_strcmp(propertyName, "DK2Latency") == 0)
+        {
+            if (HMDInfo.HmdType != HmdType_DK2)
+                return 0;
+
+            float data[3];            
+            TimeManager.GetLatencyTimings(data);
+            
+            return CopyFloatArrayWithLimit(values, arraySize, data, 3);
+        }
+
+        /*
+        else if (OVR_strcmp(propertyName, "CenterPupilDepth") == 0)
+        {
+            if (arraySize >= 1)
+            {
+                values[0] = SFusion.GetCenterPupilDepth();
+                return 1;
+            }
+            return 0;
+        } */
+		else if (pHMD)
+		{        
+			Profile* p = pHMD->GetProfile();
+
+			// TBD: Not quite right. Should update profile interface, so that
+			//      we can return 0 in all conditions if property doesn't exist.
+			if (p)
+			{
+				unsigned count = p->GetFloatValues(propertyName, values, arraySize);
+				return count;
+			}
+		}
+	}
+
+	return 0;
+}
+
+bool HMDState::setFloatArray(const char* propertyName, float values[], unsigned arraySize)
+{
+    if (!arraySize)
+        return false;
+    
+    if (OVR_strcmp(propertyName, "DistortionClearColor") == 0)
+    {
+        CopyFloatArrayWithLimit(RenderState.ClearColor, 4, values, arraySize);
+        return true;
+    }
+    return false;
+}
+
+
+const char* HMDState::getString(const char* propertyName, const char* defaultVal)
+{
+	if (pHMD)
+	{
+		// For now, just access the profile.
+		Profile* p = pHMD->GetProfile();
+
+		LastGetStringValue[0] = 0;
+		if (p && p->GetValue(propertyName, LastGetStringValue, sizeof(LastGetStringValue)))
+		{
+			return LastGetStringValue;
+		}
+	}
+
+	return defaultVal;
+}
+
+//-------------------------------------------------------------------------------------
+// *** Latency Test
+
+bool HMDState::ProcessLatencyTest(unsigned char rgbColorOut[3])
+{
+    bool result = false;
+
+    // Check create.
+    if (pLatencyTester)
+    {
+        if (pLatencyTester->IsConnected())
+        {
+            Color colorToDisplay;
+
+            LatencyUtil.ProcessInputs();
+            result = LatencyUtil.DisplayScreenColor(colorToDisplay);
+            rgbColorOut[0] = colorToDisplay.R;
+            rgbColorOut[1] = colorToDisplay.G;
+            rgbColorOut[2] = colorToDisplay.B;
+        }
+        else
+        {
+            // Disconnect.
+            LatencyUtil.SetDevice(NULL);
+            pLatencyTester = 0;
+            LogText("LATENCY SENSOR disconnected.\n");
+        }
+    }
+    else if (AddLatencyTestCount > 0)
+    {
+        // This might have some unlikely race condition issue which could cause us to miss a device...
+        AddLatencyTestCount = 0;
+
+        pLatencyTester = *GlobalState::pInstance->GetManager()->
+                            EnumerateDevices<LatencyTestDevice>().CreateDevice();
+        if (pLatencyTester)
+        {
+            LatencyUtil.SetDevice(pLatencyTester);
+            LogText("LATENCY TESTER connected\n");
+        }        
+    }
+    
+    return result;
+}
+
+void HMDState::ProcessLatencyTest2(unsigned char rgbColorOut[3], double startTime)
+{
+    // Check create.
+    if (!(EnabledHmdCaps & ovrHmdCap_LatencyTest))
+        return;
+
+    if (pLatencyTesterDisplay && !LatencyUtil2.HasDisplayDevice())
+    {
+        if (!pLatencyTesterDisplay->IsConnected())
+        {
+            LatencyUtil2.SetDisplayDevice(NULL);
+        }
+    }
+    else if (AddLatencyTestDisplayCount > 0)
+    {
+        // This might have some unlikely race condition issue
+        // which could cause us to miss a device...
+        AddLatencyTestDisplayCount = 0;
+
+        pLatencyTesterDisplay = *GlobalState::pInstance->GetManager()->
+                                 EnumerateDevices<LatencyTestDevice>().CreateDevice();
+        if (pLatencyTesterDisplay)
+        {
+            LatencyUtil2.SetDisplayDevice(pLatencyTesterDisplay);
+        }
+    }
+
+    if (LatencyUtil2.HasDevice() && pSensor && pSensor->IsConnected())
+    {
+        LatencyUtil2.BeginTest(startTime);
+
+        Color colorToDisplay;
+        LatencyTest2Active = LatencyUtil2.DisplayScreenColor(colorToDisplay);
+        rgbColorOut[0] = colorToDisplay.R;
+        rgbColorOut[1] = colorToDisplay.G;
+        rgbColorOut[2] = colorToDisplay.B;
+    }
+    else
+    {
+        LatencyTest2Active = false;
+    }
+}
+
+//-------------------------------------------------------------------------------------
+// *** Rendering
+
+bool HMDState::ConfigureRendering(ovrEyeRenderDesc eyeRenderDescOut[2],
+                                  const ovrFovPort eyeFovIn[2],
+                                  const ovrRenderAPIConfig* apiConfig,                                  
+                                  unsigned distortionCaps)
+{
+    ThreadChecker::Scope checkScope(&RenderAPIThreadChecker, "ovrHmd_ConfigureRendering");
+
+    // null -> shut down.
+    if (!apiConfig)
+    {
+        if (pRenderer)
+            pRenderer.Clear();        
+        RenderingConfigured = false; 
+        return true;
+    }
+
+    if (pRenderer &&
+        (apiConfig->Header.API != pRenderer->GetRenderAPI()))
+    {
+        // Shutdown old renderer.
+        if (pRenderer)
+            pRenderer.Clear();
+    }
+
+
+    // Step 1: do basic setup configuration
+    RenderState.setupRenderDesc(eyeRenderDescOut, eyeFovIn);
+    RenderState.EnabledHmdCaps = EnabledHmdCaps;     // This is a copy... Any cleaner way?
+    RenderState.DistortionCaps = distortionCaps;
+
+    TimeManager.ResetFrameTiming(0,
+                                 (EnabledHmdCaps & ovrHmdCap_DynamicPrediction) ? true : false,
+                                 true);
+
+    LastFrameTimeSeconds = 0.0f;
+
+    // Set RenderingConfigured early to avoid ASSERTs in renderer initialization.
+    RenderingConfigured = true;
+
+    if (!pRenderer)
+    {
+        pRenderer = *DistortionRenderer::APICreateRegistry
+                        [apiConfig->Header.API](this, TimeManager, RenderState);
+    }
+
+    if (!pRenderer ||
+        !pRenderer->Initialize(apiConfig, distortionCaps))
+    {
+        RenderingConfigured = false;
+        return false;
+    }    
+
+    return true;
+}
+
+
+
+ovrPosef HMDState::BeginEyeRender(ovrEyeType eye)
+{
+    // Debug checks.
+    checkBeginFrameScope("ovrHmd_BeginEyeRender");
+    ThreadChecker::Scope checkScope(&RenderAPIThreadChecker, "ovrHmd_BeginEyeRender");
+
+    // Unknown eyeId provided in ovrHmd_BeginEyeRender
+    OVR_ASSERT_LOG(eye == ovrEye_Left || eye == ovrEye_Right,
+                   ("ovrHmd_BeginEyeRender eyeId out of range."));     
+    OVR_ASSERT_LOG(EyeRenderActive[eye] == false,
+                   ("Multiple calls to ovrHmd_BeginEyeRender for the same eye."));
+
+    EyeRenderActive[eye] = true;
+    
+    // Only process latency tester for drawing the left eye (assumes left eye is drawn first)
+    if (pRenderer && eye == 0)
+    {
+        LatencyTestActive = ProcessLatencyTest(LatencyTestDrawColor);
+    }
+
+    return ovrHmd_GetEyePose(this, eye);
+}
+
+
+void HMDState::EndEyeRender(ovrEyeType eye, ovrPosef renderPose, ovrTexture* eyeTexture)
+{
+    // Debug checks.
+    checkBeginFrameScope("ovrHmd_EndEyeRender");
+    ThreadChecker::Scope checkScope(&RenderAPIThreadChecker, "ovrHmd_EndEyeRender");
+
+    if (!EyeRenderActive[eye])
+    {
+        OVR_ASSERT_LOG(false,
+                       ("ovrHmd_EndEyeRender called without ovrHmd_BeginEyeRender."));
+        return;
+    }
+
+    RenderState.EyeRenderPoses[eye] = renderPose;
+
+    if (pRenderer)
+        pRenderer->SubmitEye(eye, eyeTexture);
+
+    EyeRenderActive[eye] = false;
+}
+
+}} // namespace OVR::CAPI
+