From 8526ac74a51076adda3b4793d39a321bc0e5042d Mon Sep 17 00:00:00 2001
From: Brad Davis <bdavis@saintandreas.org>
Date: Fri, 7 Oct 2016 13:36:49 -0700
Subject: [PATCH] Turn on forced reprojection on i5 systems

---
 plugins/openvr/src/OpenVrDisplayPlugin.cpp | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/plugins/openvr/src/OpenVrDisplayPlugin.cpp b/plugins/openvr/src/OpenVrDisplayPlugin.cpp
index 9247ebea0b..68bb23a84d 100644
--- a/plugins/openvr/src/OpenVrDisplayPlugin.cpp
+++ b/plugins/openvr/src/OpenVrDisplayPlugin.cpp
@@ -39,6 +39,10 @@ const QString StandingHMDSensorMode = "Standing HMD Sensor Mode"; // this probab
 PoseData _nextRenderPoseData;
 PoseData _nextSimPoseData;
 
+#define MIN_CORES_FOR_NORMAL_RENDER 5
+bool forceInterleavedReprojection = (QThread::idealThreadCount() < MIN_CORES_FOR_NORMAL_RENDER);
+
+
 static std::array<vr::Hmd_Eye, 2> VR_EYES { { vr::Eye_Left, vr::Eye_Right } };
 bool _openVrDisplayActive { false };
 // Flip y-axis since GL UV coords are backwards.
@@ -399,7 +403,10 @@ bool OpenVrDisplayPlugin::internalActivate() {
     });
 
     // enable async time warp
-    //vr::VRCompositor()->ForceInterleavedReprojectionOn(true);
+    if (forceInterleavedReprojection) {
+        vr::VRCompositor()->ForceInterleavedReprojectionOn(true);
+    }
+    
 
     // set up default sensor space such that the UI overlay will align with the front of the room.
     auto chaperone = vr::VRChaperone();