From 723d641771e37d2576b162efc1c9f8e51f532da7 Mon Sep 17 00:00:00 2001
From: Lubos <tridosm@gmail.com>
Date: Sat, 27 Aug 2022 12:23:03 +0200
Subject: [PATCH] OpenXR - Enable performance mode

---
 Common/VR/VRBase.cpp        |  4 ++++
 Common/VR/VRBase.h          |  2 ++
 Common/VR/VRFramebuffer.cpp | 26 ++++++++++++++++++++++++++
 3 files changed, 32 insertions(+)

diff --git a/Common/VR/VRBase.cpp b/Common/VR/VRBase.cpp
index 56745116e7..9932d09553 100644
--- a/Common/VR/VRBase.cpp
+++ b/Common/VR/VRBase.cpp
@@ -10,6 +10,10 @@ int vr_initialized = 0;
 
 const char* const requiredExtensionNames[] = {
 		XR_KHR_OPENGL_ES_ENABLE_EXTENSION_NAME,
+#ifdef OPENXR_HAS_PERFORMANCE_EXTENSION
+		XR_EXT_PERFORMANCE_SETTINGS_EXTENSION_NAME,
+		XR_KHR_ANDROID_THREAD_SETTINGS_EXTENSION_NAME,
+#endif
 		XR_KHR_COMPOSITION_LAYER_CYLINDER_EXTENSION_NAME};
 const uint32_t numRequiredExtensions =
 		sizeof(requiredExtensionNames) / sizeof(requiredExtensionNames[0]);
diff --git a/Common/VR/VRBase.h b/Common/VR/VRBase.h
index ae7fb7fcd3..482c541a91 100644
--- a/Common/VR/VRBase.h
+++ b/Common/VR/VRBase.h
@@ -73,6 +73,8 @@ static void OXR_CheckErrors(XrInstance instance, XrResult result, const char* fu
 #define OXR(func) func;
 #endif
 
+#define OPENXR_HAS_PERFORMANCE_EXTENSION
+
 enum { ovrMaxLayerCount = 1 };
 enum { ovrMaxNumEyes = 2 };
 
diff --git a/Common/VR/VRFramebuffer.cpp b/Common/VR/VRFramebuffer.cpp
index 81e40ec3d8..cda680908d 100644
--- a/Common/VR/VRFramebuffer.cpp
+++ b/Common/VR/VRFramebuffer.cpp
@@ -273,6 +273,32 @@ void ovrApp_HandleSessionStateChanges(ovrApp* app, XrSessionState state) {
 		OXR(result = xrBeginSession(app->Session, &sessionBeginInfo));
 
 		app->SessionActive = (result == XR_SUCCESS);
+
+		// Set session state once we have entered VR mode and have a valid session object.
+#ifdef OPENXR_HAS_PERFORMANCE_EXTENSION
+		if (app->SessionActive) {
+			XrPerfSettingsLevelEXT cpuPerfLevel = XR_PERF_SETTINGS_LEVEL_BOOST_EXT;
+			XrPerfSettingsLevelEXT gpuPerfLevel = XR_PERF_SETTINGS_LEVEL_BOOST_EXT;
+
+			PFN_xrPerfSettingsSetPerformanceLevelEXT pfnPerfSettingsSetPerformanceLevelEXT = NULL;
+			OXR(xrGetInstanceProcAddr(
+					app->Instance,
+					"xrPerfSettingsSetPerformanceLevelEXT",
+					(PFN_xrVoidFunction*)(&pfnPerfSettingsSetPerformanceLevelEXT)));
+
+			OXR(pfnPerfSettingsSetPerformanceLevelEXT(app->Session, XR_PERF_SETTINGS_DOMAIN_CPU_EXT, cpuPerfLevel));
+			OXR(pfnPerfSettingsSetPerformanceLevelEXT(app->Session, XR_PERF_SETTINGS_DOMAIN_GPU_EXT, gpuPerfLevel));
+
+			PFN_xrSetAndroidApplicationThreadKHR pfnSetAndroidApplicationThreadKHR = NULL;
+			OXR(xrGetInstanceProcAddr(
+					app->Instance,
+					"xrSetAndroidApplicationThreadKHR",
+					(PFN_xrVoidFunction*)(&pfnSetAndroidApplicationThreadKHR)));
+
+			OXR(pfnSetAndroidApplicationThreadKHR(app->Session, XR_ANDROID_THREAD_TYPE_APPLICATION_MAIN_KHR, app->MainThreadTid));
+			OXR(pfnSetAndroidApplicationThreadKHR(app->Session, XR_ANDROID_THREAD_TYPE_RENDERER_MAIN_KHR, app->RenderThreadTid));
+		}
+#endif
 	} else if (state == XR_SESSION_STATE_STOPPING) {
 		assert(app->SessionActive);