From 5fcb3c84d49b65972cf174aa3b33b4335298d5b3 Mon Sep 17 00:00:00 2001
From: Josh Matthews <josh@joshmatthews.net>
Date: Wed, 15 Apr 2020 18:06:58 -0400
Subject: [PATCH] Depend on the preview OpenXR runtime for performance fixes.

---
 support/hololens/ServoApp/Package.appxmanifest   | 2 +-
 support/hololens/ServoApp/ServoControl/Servo.cpp | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/support/hololens/ServoApp/Package.appxmanifest b/support/hololens/ServoApp/Package.appxmanifest
index 5ada19983d7..26091d47f0a 100644
--- a/support/hololens/ServoApp/Package.appxmanifest
+++ b/support/hololens/ServoApp/Package.appxmanifest
@@ -9,7 +9,7 @@
   </Properties>
   <Dependencies>
     <TargetDeviceFamily Name="Windows.Universal" MinVersion="10.0.0.0" MaxVersionTested="10.0.0.0" />
-    <PackageDependency Name="Microsoft.WindowsMixedReality.Runtime" Publisher="CN=Microsoft Corporation, O=Microsoft Corporation, L=Redmond, S=Washington, C=US" MinVersion="0.0.1.0" />
+    <PackageDependency Name="Microsoft.WindowsMixedReality.Runtime" Publisher="CN=Microsoft Corporation, O=Microsoft Corporation, L=Redmond, S=Washington, C=US" MinVersion="100.2004.3007.0"/>
   </Dependencies>
   <Resources>
     <Resource Language="x-generate" />
diff --git a/support/hololens/ServoApp/ServoControl/Servo.cpp b/support/hololens/ServoApp/ServoControl/Servo.cpp
index 76753d0758f..5b59620bf05 100644
--- a/support/hololens/ServoApp/ServoControl/Servo.cpp
+++ b/support/hololens/ServoApp/ServoControl/Servo.cpp
@@ -109,6 +109,7 @@ const char *prompt_input(const char *message, const char *default,
 Servo::Servo(hstring url, hstring args, GLsizei width, GLsizei height,
              float dpi, ServoDelegate &aDelegate)
     : mWindowHeight(height), mWindowWidth(width), mDelegate(aDelegate) {
+  SetEnvironmentVariableA("PreviewRuntimeEnabled", "1");
 
   capi::CInitOptions o;
   hstring defaultPrefs = L" --pref dom.webxr.enabled --devtools";