nuclear@0: /************************************************************************************
nuclear@0: 
nuclear@0: Filename    :   OVR_System.cpp
nuclear@0: Content     :   General kernel initialization/cleanup, including that
nuclear@0:                 of the memory allocator.
nuclear@0: Created     :   September 19, 2012
nuclear@0: Notes       : 
nuclear@0: 
nuclear@0: Copyright   :   Copyright 2014 Oculus VR, LLC All Rights reserved.
nuclear@0: 
nuclear@0: Licensed under the Oculus VR Rift SDK License Version 3.2 (the "License"); 
nuclear@0: you may not use the Oculus VR Rift SDK except in compliance with the License, 
nuclear@0: which is provided at the time of installation or download, or which 
nuclear@0: otherwise accompanies this software in either electronic or hard copy form.
nuclear@0: 
nuclear@0: You may obtain a copy of the License at
nuclear@0: 
nuclear@0: http://www.oculusvr.com/licenses/LICENSE-3.2 
nuclear@0: 
nuclear@0: Unless required by applicable law or agreed to in writing, the Oculus VR SDK 
nuclear@0: distributed under the License is distributed on an "AS IS" BASIS,
nuclear@0: WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
nuclear@0: See the License for the specific language governing permissions and
nuclear@0: limitations under the License.
nuclear@0: 
nuclear@0: ************************************************************************************/
nuclear@0: 
nuclear@0: #include "OVR_System.h"
nuclear@0: #include "OVR_Threads.h"
nuclear@0: #include "OVR_Timer.h"
nuclear@0: #include "../Displays/OVR_Display.h"
nuclear@0: #ifdef OVR_OS_WIN32
nuclear@0: #include "../Displays/OVR_Win32_ShimFunctions.h"
nuclear@0: #endif
nuclear@0: 
nuclear@0: namespace OVR {
nuclear@0: 
nuclear@0: #ifdef OVR_OS_WIN32
nuclear@0: extern bool anyRiftsInExtendedMode();
nuclear@0: #endif
nuclear@0: 
nuclear@0: // Stack of destroy listeners (push/pop semantics)
nuclear@0: static SystemSingletonInternal *SystemShutdownListenerStack = 0;
nuclear@0: static Lock stackLock;
nuclear@0: static bool DisplayShimInitialized = false;
nuclear@0: 
nuclear@0: void SystemSingletonInternal::PushDestroyCallbacks()
nuclear@0: {
nuclear@0:     Lock::Locker locker(&stackLock);
nuclear@0: 
nuclear@0:     // Push listener onto the stack
nuclear@0:     NextSingleton = SystemShutdownListenerStack;
nuclear@0:     SystemShutdownListenerStack = this;
nuclear@0: }
nuclear@0: 
nuclear@0: void System::DirectDisplayInitialize()
nuclear@0: {
nuclear@0: #ifdef OVR_OS_WIN32
nuclear@0: 	// Set up display code for Windows
nuclear@0: 	Win32::DisplayShim::GetInstance();
nuclear@0: 
nuclear@0: 	// This code will look for the first display. If it's a display
nuclear@0: 	// that's extending the destkop, the code will assume we're in
nuclear@0: 	// compatibility mode. Compatibility mode prevents shim loading
nuclear@0: 	// and renders only to extended Rifts.
nuclear@0: 	// If we find a display and it's application exclusive,
nuclear@0: 	// we load the shim so we can render to it.
nuclear@0: 	// If no display is available, we revert to whatever the
nuclear@0: 	// driver tells us we're in
nuclear@0: 
nuclear@0: 	bool anyExtendedRifts = anyRiftsInExtendedMode() || Display::InCompatibilityMode( false );
nuclear@0: 	
nuclear@0:     DisplayShimInitialized = Win32::DisplayShim::GetInstance().Initialize(anyExtendedRifts);
nuclear@0: #endif
nuclear@0: }
nuclear@0: 
nuclear@0: bool System::DirectDisplayEnabled()
nuclear@0: {
nuclear@0:     return DisplayShimInitialized;
nuclear@0: }
nuclear@0: 
nuclear@0: // Initializes System core, installing allocator.
nuclear@0: void System::Init(Log* log, Allocator *palloc)
nuclear@0: {    
nuclear@0:     if (!Allocator::GetInstance())
nuclear@0:     {
nuclear@0:         Log::SetGlobalLog(log);
nuclear@0:         Timer::initializeTimerSystem();
nuclear@0:         Allocator::setInstance(palloc);
nuclear@0: 		Display::Initialize();
nuclear@0: 		DirectDisplayInitialize();
nuclear@0:     }
nuclear@0:     else
nuclear@0:     {
nuclear@0:         OVR_DEBUG_LOG(("System::Init failed - duplicate call."));
nuclear@0:     }
nuclear@0: }
nuclear@0: 
nuclear@0: void System::Destroy()
nuclear@0: {    
nuclear@0:     if (Allocator::GetInstance())
nuclear@0:     {
nuclear@0: #ifdef OVR_OS_WIN32
nuclear@0: 		Win32::DisplayShim::GetInstance().Shutdown();
nuclear@0: #endif
nuclear@0: 
nuclear@0: 		// Invoke all of the post-finish callbacks (normal case)
nuclear@0:         for (SystemSingletonInternal *listener = SystemShutdownListenerStack; listener; listener = listener->NextSingleton)
nuclear@0: 		{
nuclear@0: 			listener->OnThreadDestroy();
nuclear@0: 		}
nuclear@0: 
nuclear@0: #ifdef OVR_ENABLE_THREADS
nuclear@0: 		// Wait for all threads to finish; this must be done so that memory
nuclear@0: 		// allocator and all destructors finalize correctly.
nuclear@0: 		Thread::FinishAllThreads();
nuclear@0: #endif
nuclear@0: 
nuclear@0: 		// Invoke all of the post-finish callbacks (normal case)
nuclear@0:         for (SystemSingletonInternal *next, *listener = SystemShutdownListenerStack; listener; listener = next)
nuclear@0: 		{
nuclear@0:             next = listener->NextSingleton;
nuclear@0: 
nuclear@0: 			listener->OnSystemDestroy();
nuclear@0: 		}
nuclear@0: 
nuclear@0:         SystemShutdownListenerStack = 0;
nuclear@0: 
nuclear@0: 		// Shutdown heap and destroy SysAlloc singleton, if any.
nuclear@0:         Allocator::GetInstance()->onSystemShutdown();
nuclear@0:         Allocator::setInstance(0);
nuclear@0: 
nuclear@0:         Timer::shutdownTimerSystem();
nuclear@0:         Log::SetGlobalLog(Log::GetDefaultLog());
nuclear@0:     }
nuclear@0:     else
nuclear@0:     {
nuclear@0:         OVR_DEBUG_LOG(("System::Destroy failed - System not initialized."));
nuclear@0:     }
nuclear@0: }
nuclear@0: 
nuclear@0: // Returns 'true' if system was properly initialized.
nuclear@0: bool System::IsInitialized()
nuclear@0: {
nuclear@0:     return Allocator::GetInstance() != 0;
nuclear@0: }
nuclear@0: 
nuclear@0: 
nuclear@0: } // namespace OVR