Added support for AMD PowerXpress override.

Generalized _GLFW_USE_OPTIMUS_HPG to _GLFW_USE_HYBRID_HPG to reflect the
change.

Fixes #520.

CMakeLists.txt

@@ -26,7 +26,7 @@ option(GLFW_INSTALL "Generate installation target" ON)
 option(GLFW_DOCUMENT_INTERNALS "Include internals in documentation" OFF)
 
 if (WIN32)
-    option(GLFW_USE_OPTIMUS_HPG "Force use of high-performance GPU on Optimus systems" OFF)
+    option(GLFW_USE_HYBRID_HPG "Force use of high-performance GPU on hybrid systems" OFF)
 endif()
 
 if (APPLE)
@@ -235,8 +235,8 @@ if (_GLFW_WIN32)
 
     list(APPEND glfw_PKG_LIBS "-lgdi32")
 
-    if (GLFW_USE_OPTIMUS_HPG)
-        set(_GLFW_USE_OPTIMUS_HPG 1)
+    if (GLFW_USE_HYBRID_HPG)
+        set(_GLFW_USE_HYBRID_HPG 1)
     endif()
 endif()
 

README.md

@@ -63,6 +63,8 @@ GLFW bundles a number of dependencies in the `deps/` directory.
 ## Changelog
 
  - Minimum required CMake version updated to 2.8.12
+ - Renamed hybrid GPU override compile-time option to `_GLFW_USE_HYBRID_HPG` and
+   added support for AMD PowerXpress systems
  - Bugfix: Initialization failed on headless systems
  - Bugfix: The cached current context could get out of sync
  - [Cocoa] Bugfix: The cached `NSScreen` for a monitor could get out of sync

docs/compile.dox

@@ -221,11 +221,11 @@ DLL version of the Visual C++ library is used.  It is recommended to set this to
 `ON`, as this keeps the executable smaller and benefits from security and bug
 fix updates of the Visual C++ runtime.
 
-`GLFW_USE_OPTIMUS_HPG` determines whether to export the `NvOptimusEnablement`
-symbol, which forces the use of the high-performance GPU on Nvidia Optimus
-systems.  This symbol needs to be exported by the EXE to be detected by the
-driver, so the override will not work if GLFW is built as a DLL.  See _Enabling
-High Performance Graphics Rendering on Optimus Systems_ for more details.
+`GLFW_USE_HYBRID_HPG` determines whether to export the `NvOptimusEnablement` and
+`AmdPowerXpressRequestHighPerformance` symbols, which force the use of the
+high-performance GPU on Nvidia Optimus and AMD PowerXpress systems.  These symbols
+need to be exported by the EXE to be detected by the driver, so the override
+will not work if GLFW is built as a DLL.
 
 
 @subsubsection compile_options_egl EGL specific CMake options

src/glfw_config.h.in

@@ -57,8 +57,8 @@
 // Define this to 1 if building as a shared library / dynamic library / DLL
 #cmakedefine _GLFW_BUILD_DLL
 
-// Define this to 1 to force use of high-performance GPU on Optimus systems
-#cmakedefine _GLFW_USE_OPTIMUS_HPG
+// Define this to 1 to force use of high-performance GPU on hybrid systems
+#cmakedefine _GLFW_USE_HYBRID_HPG
 
 // Define this to 1 if the XInput X11 extension is available
 #cmakedefine _GLFW_HAS_XINPUT

src/win32_init.c

@@ -31,14 +31,21 @@
 #include <malloc.h>
 
 
-#if defined(_GLFW_USE_OPTIMUS_HPG)
+#if defined(_GLFW_USE_HYBRID_HPG) || defined(_GLFW_USE_OPTIMUS_HPG)
 
 // Applications exporting this symbol with this value will be automatically
-// directed to the high-performance GPU on Nvidia Optimus systems
+// directed to the high-performance GPU on Nvidia Optimus systems with
+// up-to-date drivers
 //
-__declspec(dllexport) DWORD NvOptimusEnablement = 0x00000001;
+__declspec(dllexport) DWORD NvOptimusEnablement = 1;
 
-#endif // _GLFW_USE_OPTIMUS_HPG
+// Applications exporting this symbol with this value will be automatically
+// directed to the high-performance GPU on AMD PowerXpress systems with
+// up-to-date drivers
+//
+__declspec(dllexport) int AmdPowerXpressRequestHighPerformance = 1;
+
+#endif // _GLFW_USE_HYBRID_HPG
 
 #if defined(_GLFW_BUILD_DLL)