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adysoft
New Participant
December 6, 2014

Clean shutdown

Hi,
I've just started trying to integrate oculus to my game engine and i am having issues to perform a clean shutdown.
I am trying to wrap oculus access inside a OculusWrapper class.
I get a pointer to this wrapper in my game, and on exit, i call oculus shutdown, then free my wrapper. AFAIK this should work in theory, but it doesn't, and i get an Access Violation exception. I am no C++ expert so it might be totally my fault, but i can't see where the issue is.
Code sample :


// OculusWrapper.cpp
OculusWrapper::OculusWrapper(): mHmd(0)
{
}

void OculusWrapper::Initialize()
{
	ovr_Initialize();
	mHmd = ovrHmd_Create(0);
	if (mHmd)
	{
		ovrSizei resolution = mHmd->Resolution;
	}
}

void OculusWrapper::Shutdown()
{
	if (mHmd)
	{	
		ovrHmd_Destroy(mHmd);
		ovr_Shutdown();		
	}
}

OculusWrapper::~OculusWrapper()
{	
}



// LightGame.cpp

LightGame::LightGame(HINSTANCE hInstance)
: mOculusWrapper(nullptr)
{
    ...
    mOculusWrapper = new OculusWrapper();
    mOculusWrapper->Initialize();
    ...
}

LightGame::~LightGame()
{
    ...	
    mOculusWrapper->Shutdown();
    delete mOculusWrapper;
    ...
}


Exception :
Unhandled exception at 0x77091A91 in Light.exe: 0xC0000005: Access violation executing location 0x00000000.

If i don't call shutdown, i don't get any exception, but i'd like to do things properly.
Any idea ?

    1 reply

    AlcoJaguar
    New Participant
    July 27, 2015
    This may be a bit too late, or may not help much, but I ran into an access violation when calling ovrHmd_Destroy(...) before freeing the mirror texture and swap texture set I created using that HMD structure. Making sure those textures are freed via the LibOVR destroy functions before calling ovrHmd_Destroy(...) fixed my issue. This wasn't a case of the texture destroy functions causing the violation either, it seems that ovrHmd_Destroy(...) will fail if there are any currently allocated textures associated with it, at least in my experience. I don't see you creating any textures in this example, but did you happen to allocate something else you may have overlooked?

    I'm currently using 0.6.0.1-beta
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