NvOptimusEnablement and AmdPowerXpressRequestHighPerformance symbols are

now exported for laptops with dual graphics

src/xenia/app/xenia_main.cc

@@ -26,6 +26,16 @@
 // Available graphics systems:
 #include "xenia/gpu/gl4/gl4_graphics_system.h"
 
+// Nvidia Optimus/AMD PowerXpress support
+// http://developer.download.nvidia.com/devzone/devcenter/gamegraphics/files/OptimusRenderingPolicies.pdf
+// http://stackoverflow.com/questions/17458803/amd-equivalent-to-nvoptimusenablement
+#if XE_PLATFORM_WIN32
+extern "C" {
+	__declspec(dllexport) unsigned long NvOptimusEnablement = 0x00000001;
+	__declspec(dllexport) int AmdPowerXpressRequestHighPerformance = 1;
+}
+#endif // XE_PLATFORM_WIN32
+
 // Available input drivers:
 #include "xenia/hid/nop/nop_hid.h"
 #if XE_PLATFORM_WIN32