From 2c951cf418fccbe1309c393d577ea9e0223f1420 Mon Sep 17 00:00:00 2001
From: "C. J. Howard" <cjhoward@protonmail.com>
Date: Wed, 19 Aug 2020 01:40:15 -0700
Subject: [PATCH] Export NvOptimusEnablement global variable to signal Nvidia
 drivers to use high-performance graphics

---
 CMakeLists.txt                  | 12 ++++++++++++
 src/platform/windows/nvidia.cpp | 27 +++++++++++++++++++++++++++
 2 files changed, 39 insertions(+)
 create mode 100644 src/platform/windows/nvidia.cpp

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 55db635..b80be9e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -35,7 +35,19 @@ configure_file(${PROJECT_SOURCE_DIR}/src/configuration.hpp.in
 file(GLOB_RECURSE SOURCE_FILES
 	${PROJECT_SOURCE_DIR}/src/*.cpp)
 
+# Remove platform-specific source files
+set(EXCLUDE_DIR "${PROJECT_SOURCE_DIR}/src/platform/")
+foreach(TMP_PATH ${SOURCE_FILES})
+	string(FIND ${TMP_PATH} ${EXCLUDE_DIR} EXCLUDE_DIR_FOUND)
+	if (NOT ${EXCLUDE_DIR_FOUND} EQUAL -1)
+		list(REMOVE_ITEM SOURCE_FILES ${TMP_PATH})
+	endif ()
+endforeach(TMP_PATH)
+
 if(MSVC)
+	# Add platform-specific source files
+	list(APPEND SOURCE_FILES "${PROJECT_SOURCE_DIR}/src/platform/windows/nvidia.cpp")
+	
 	# Generate Windows icon resource file
 	set(ICON_FILE "${PROJECT_SOURCE_DIR}/../antkeeper-data/src/icons/antkeeper.ico")
 	configure_file(${PROJECT_SOURCE_DIR}/src/platform/windows/icon.rc.in
diff --git a/src/platform/windows/nvidia.cpp b/src/platform/windows/nvidia.cpp
new file mode 100644
index 0000000..c4b7004
--- /dev/null
+++ b/src/platform/windows/nvidia.cpp
@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2020  Christopher J. Howard
+ *
+ * This file is part of Antkeeper source code.
+ *
+ * Antkeeper source code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Antkeeper source code is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+
+// Direct Nvidia Optimus to use high-performance graphics
+extern "C"
+{
+	_declspec(dllexport) DWORD NvOptimusEnablement = 0x00000001;
+}