Disable screensaver on OS X

When playing a game on OS X, although the screen does not go to
sleep, the screensaver is still enabled, and therefore, during
gameplay, the screensaver may start running, which is not in
accordance to the behaviour on other other environments (Windows
and X11). It can be argued that the screensaver interrupting
gameplay is a nuissance to many players.

The changes in this commit are intended to allow Dolphin to disable
the screensaver during gameplay, just as intended on other platforms.

The changes have been tested on OS X 10.11 (El Capitan).

1 files changed, 19 insertions, 0 deletions

diff --git a/Source/Core/DolphinWX/FrameTools.cpp b/Source/Core/DolphinWX/FrameTools.cpp
index 608141e94e..6ce69b42c8 100644
--- a/Source/Core/DolphinWX/FrameTools.cpp
+++ b/Source/Core/DolphinWX/FrameTools.cpp
@@ -84,6 +84,10 @@
 #include "VideoCommon/VideoBackendBase.h"
 #include "VideoCommon/VideoConfig.h"
 
+#ifdef __APPLE__
+#import <IOKit/pwr_mgt/IOPMLib.h>
+#endif
+
 class InputConfig;
 class wxFrame;
 
@@ -724,6 +728,14 @@ void CFrame::StartGame(const std::string& filename)
         SConfig::GetInstance().bDisableScreenSaver ? ES_DISPLAY_REQUIRED : 0;
     SetThreadExecutionState(ES_CONTINUOUS | shouldScreenSave | ES_SYSTEM_REQUIRED);
 #endif
+#ifdef __APPLE__
+    CFStringRef reason_for_activity = CFSTR("Emulation Running");
+    if (IOPMAssertionCreateWithName(kIOPMAssertionTypeNoDisplaySleep, kIOPMAssertionLevelOn,
+                                    reason_for_activity, &m_power_assertion) != kIOReturnSuccess)
+    {
+      m_power_assertion = kIOPMNullAssertionID;
+    }
+#endif
 
     // We need this specifically to support setting the focus properly when using
     // the 'render to main window' feature on Windows
@@ -898,6 +910,13 @@ void CFrame::OnStopped()
   // Allow windows to resume normal idling behavior
   SetThreadExecutionState(ES_CONTINUOUS);
 #endif
+#ifdef __APPLE__
+  if (m_power_assertion != kIOPMNullAssertionID)
+  {
+    IOPMAssertionRelease(m_power_assertion);
+    m_power_assertion = kIOPMNullAssertionID;
+  }
+#endif
 
   m_RenderFrame->SetTitle(StrToWxStr(scm_rev_str));