Moved NvOptimusEnablement and AmdPowerXpressRequestHighPerformance out of sfml-main and into a macro the user can place in their own translation unit when they need it. Fixes #1192

CMakeLists.txt

@@ -366,6 +366,7 @@ else()
     add_custom_command(TARGET SFML POST_BUILD COMMAND cp -r
                        ${PROJECT_SOURCE_DIR}/include/SFML/Config.hpp
                        ${PROJECT_SOURCE_DIR}/include/SFML/OpenGL.hpp
+                       ${PROJECT_SOURCE_DIR}/include/SFML/GpuPreference.hpp
                        ${PROJECT_SOURCE_DIR}/include/SFML/System.hpp
                        ${PROJECT_SOURCE_DIR}/include/SFML/Main.hpp
                        ${PROJECT_SOURCE_DIR}/include/SFML/System

include/SFML/GpuPreference.hpp

@@ -0,0 +1,74 @@
+////////////////////////////////////////////////////////////
+//
+// SFML - Simple and Fast Multimedia Library
+// Copyright (C) 2007-2018 Laurent Gomila (laurent@sfml-dev.org)
+//
+// This software is provided 'as-is', without any express or implied warranty.
+// In no event will the authors be held liable for any damages arising from the use of this software.
+//
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it freely,
+// subject to the following restrictions:
+//
+// 1. The origin of this software must not be misrepresented;
+//    you must not claim that you wrote the original software.
+//    If you use this software in a product, an acknowledgment
+//    in the product documentation would be appreciated but is not required.
+//
+// 2. Altered source versions must be plainly marked as such,
+//    and must not be misrepresented as being the original software.
+//
+// 3. This notice may not be removed or altered from any source distribution.
+//
+////////////////////////////////////////////////////////////
+
+#ifndef SFML_GPUPREFERENCE_HPP
+#define SFML_GPUPREFERENCE_HPP
+
+
+////////////////////////////////////////////////////////////
+/// Headers
+////////////////////////////////////////////////////////////
+#include <SFML/Config.hpp>
+
+
+////////////////////////////////////////////////////////////
+/// \file
+///
+/// \brief File containing SFML_DEFINE_DISCRETE_GPU_PREFERENCE
+///
+////////////////////////////////////////////////////////////
+
+
+////////////////////////////////////////////////////////////
+/// \def SFML_DEFINE_DISCRETE_GPU_PREFERENCE
+///
+/// \brief A macro to encourage usage of the discrete GPU
+///
+/// In order to inform the Nvidia/AMD driver that an SFML
+/// application could benefit from using the more powerful
+/// discrete GPU, special symbols have to be publicly
+/// exported from the final executable.
+///
+/// SFML defines a helper macro to easily do this.
+///
+/// Place SFML_DEFINE_DISCRETE_GPU_PREFERENCE in the
+/// global scope of a source file that will be linked into
+/// the final executable. Typically it is best to place it
+/// where the main function is also defined.
+///
+////////////////////////////////////////////////////////////
+#if defined(SFML_SYSTEM_WINDOWS)
+
+    #define SFML_DEFINE_DISCRETE_GPU_PREFERENCE \
+                extern "C" __declspec(dllexport) unsigned long NvOptimusEnablement = 1; \
+                extern "C" __declspec(dllexport) unsigned long AmdPowerXpressRequestHighPerformance = 1;
+
+#else
+
+    #define SFML_DEFINE_DISCRETE_GPU_PREFERENCE
+
+#endif
+
+
+#endif // SFML_GPUPREFERENCE_HPP

include/SFML/Window/Window.hpp

@@ -581,6 +581,14 @@ private:
 /// structure which is passed as an optional argument when creating the
 /// window.
 ///
+/// On dual-graphics systems consisting of a low-power integrated GPU
+/// and a powerful discrete GPU, the driver picks which GPU will run an
+/// SFML application. In order to inform the driver that an SFML application
+/// can benefit from being run on the more powerful discrete GPU,
+/// #SFML_DEFINE_DISCRETE_GPU_PREFERENCE can be placed in a source file
+/// that is compiled and linked into the final application. The macro
+/// should be placed outside of any scopes in the global namespace.
+///
 /// Usage example:
 /// \code
 /// // Declare and create a new window

src/SFML/Main/MainWin32.cpp

@@ -41,14 +41,6 @@
 
 #include <windows.h>
 
-// Inform the Nvidia/AMD driver that this SFML application could
-// benefit from using the more powerful discrete GPU
-extern "C"
-{
-__declspec(dllexport) DWORD NvOptimusEnablement = 0x00000001;
-__declspec(dllexport) int AmdPowerXpressRequestHighPerformance = 1;
-}
-
 extern int main(int argc, char* argv[]);
 
 ////////////////////////////////////////////////////////////