egl: Create a way to bypass render completely

If render is disabled, we essentially go headless. This is necessary on android
because when our window is destroyed, all graphics operations become errors.

This also has the effect of dropping cpu usage down to ~0% while we're running
in the background, so it could be used on other platforms when minimized.

xbmc/Application.cpp

@@ -2955,7 +2955,7 @@ void CApplication::FrameMove(bool processEvents, bool processGUI)
     // never set a frametime less than 2 fps to avoid problems when debuggin and on breaks
     if( frameTime > 0.5 ) frameTime = 0.5;
 
-    if (processGUI)
+    if (processGUI && m_renderGUI)
     {
       g_graphicsContext.Lock();
       // check if there are notifications to display
@@ -2985,13 +2985,13 @@ void CApplication::FrameMove(bool processEvents, bool processGUI)
     ProcessGamepad(frameTime);
     ProcessEventServer(frameTime);
     ProcessPeripherals(frameTime);
-    if (processGUI)
+    if (processGUI && m_renderGUI)
     {
       m_pInertialScrollingHandler->ProcessInertialScroll(frameTime);
       m_seekHandler->Process();
     }
   }
-  if (processGUI)
+  if (processGUI && m_renderGUI)
   {
     if (!m_bStop)
       g_windowManager.Process(CTimeUtils::GetFrameTime());
@@ -6030,6 +6030,11 @@ bool CApplication::IsPresentFrame()
   return ret;
 }
 
+void CApplication::SetRenderGUI(bool renderGUI)
+{
+  m_renderGUI = renderGUI;
+}
+
 #if defined(HAS_LINUX_NETWORK)
 CNetworkLinux& CApplication::getNetwork()
 {

xbmc/Application.h

@@ -371,6 +371,7 @@ class CApplication : public CXBApplicationEx, public IPlayerCallback, public IMs
   bool SwitchToFullScreen();
 
   CSplash* GetSplash() { return m_splash; }
+  void SetRenderGUI(bool renderGUI);
 protected:
   bool LoadSkin(const CStdString& skinID);
   void LoadSkin(const boost::shared_ptr<ADDON::CSkinInfo>& skin);

xbmc/XBApplicationEx.cpp

@@ -82,6 +82,7 @@ INT CXBApplicationEx::Run(bool renderGUI)
   unsigned int lastFrameTime = 0;
   unsigned int frameTime = 0;
   const unsigned int noRenderFrameTime = 15;  // Simulates ~66fps
+  m_renderGUI = renderGUI;
 
 #ifdef XBMC_TRACK_EXCEPTIONS
   BYTE processExceptionCount = 0;
@@ -138,7 +139,7 @@ INT CXBApplicationEx::Run(bool renderGUI)
     try
     {
 #endif
-      if (!m_bStop) FrameMove(true, renderGUI);
+      if (!m_bStop) FrameMove(true, m_renderGUI);
       //reset exception count
 #ifdef XBMC_TRACK_EXCEPTIONS
       frameMoveExceptionCount = 0;
@@ -173,8 +174,8 @@ INT CXBApplicationEx::Run(bool renderGUI)
     try
     {
 #endif
-      if (renderGUI && !m_bStop) Render();
-      else if (!renderGUI)
+      if (m_renderGUI && !m_bStop) Render();
+      else if (!m_renderGUI)
       {
         frameTime = XbmcThreads::SystemClockMillis() - lastFrameTime;
         if(frameTime < noRenderFrameTime)

xbmc/XBApplicationEx.h

@@ -42,10 +42,12 @@ class CXBApplicationEx : public IWindowManagerCallback
   int  m_ExitCode;
   bool m_AppActive;
   bool m_AppFocused;
+  bool m_renderGUI;
 
   // Overridable functions for the 3D scene created by the app
   virtual bool Initialize() { return true; }
   virtual bool Cleanup() { return true; }
+  virtual void SetRenderGUI(bool renderGUI) {};
 
 public:
   // Functions to create, run, and clean up the application