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+/************************************************************************************
+
+Filename : OVR_DeviceHandle.cpp
+Content : Implementation of device handle class
+Created : February 5, 2013
+Authors : Lee Cooper
+
+Copyright : Copyright 2014 Oculus VR, Inc. All Rights reserved.
+
+Licensed under the Oculus VR Rift SDK License Version 3.1 (the "License");
+you may not use the Oculus VR Rift SDK except in compliance with the License,
+which is provided at the time of installation or download, or which
+otherwise accompanies this software in either electronic or hard copy form.
+
+You may obtain a copy of the License at
+
+http://www.oculusvr.com/licenses/LICENSE-3.1
+
+Unless required by applicable law or agreed to in writing, the Oculus VR SDK
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+*************************************************************************************/
+
+#include "OVR_DeviceHandle.h"
+
+#include "OVR_DeviceImpl.h"
+
+namespace OVR {
+
+//-------------------------------------------------------------------------------------
+// ***** DeviceHandle
+
+DeviceHandle::DeviceHandle(DeviceCreateDesc* impl) : pImpl(impl)
+{
+ if (pImpl)
+ pImpl->AddRef();
+}
+
+DeviceHandle::DeviceHandle(const DeviceHandle& src) : pImpl(src.pImpl)
+{
+ if (pImpl)
+ pImpl->AddRef();
+}
+
+DeviceHandle::~DeviceHandle()
+{
+ if (pImpl)
+ pImpl->Release();
+}
+
+void DeviceHandle::operator = (const DeviceHandle& src)
+{
+ if (src.pImpl)
+ src.pImpl->AddRef();
+ if (pImpl)
+ pImpl->Release();
+ pImpl = src.pImpl;
+}
+
+DeviceBase* DeviceHandle::GetDevice_AddRef() const
+{
+ if (pImpl && pImpl->pDevice)
+ {
+ pImpl->pDevice->AddRef();
+ return pImpl->pDevice;
+ }
+ return NULL;
+}
+
+// Returns true, if the handle contains the same device ptr
+// as specified in the parameter.
+bool DeviceHandle::IsDevice(DeviceBase* pdev) const
+{
+ return (pdev && pImpl && pImpl->pDevice) ?
+ pImpl->pDevice == pdev : false;
+}
+
+DeviceType DeviceHandle::GetType() const
+{
+ return pImpl ? pImpl->Type : Device_None;
+}
+
+bool DeviceHandle::GetDeviceInfo(DeviceInfo* info) const
+{
+ return pImpl ? pImpl->GetDeviceInfo(info) : false;
+}
+bool DeviceHandle::IsAvailable() const
+{
+ // This isn't "atomically safe", but the function only returns the
+ // recent state that may change.
+ return pImpl ? (pImpl->Enumerated && pImpl->pLock->pManager) : false;
+}
+
+bool DeviceHandle::IsCreated() const
+{
+ return pImpl ? (pImpl->pDevice != 0) : false;
+}
+
+DeviceBase* DeviceHandle::CreateDevice()
+{
+ if (!pImpl)
+ return 0;
+
+ DeviceBase* device = 0;
+ Ptr<DeviceManagerImpl> manager= 0;
+
+ // Since both manager and device pointers can only be destroyed during a lock,
+ // hold it while checking for availability.
+ // AddRef to manager so that it doesn't get released on us.
+ {
+ Lock::Locker deviceLockScope(pImpl->GetLock());
+
+ if (pImpl->pDevice)
+ {
+ pImpl->pDevice->AddRef();
+ return pImpl->pDevice;
+ }
+ manager = pImpl->GetManagerImpl();
+ }
+
+ if (manager)
+ {
+ if (manager->GetThreadId() != OVR::GetCurrentThreadId())
+ {
+ // Queue up a CreateDevice request. This fills in '&device' with AddRefed value,
+ // or keep it at null.
+ manager->GetThreadQueue()->PushCallAndWaitResult(
+ manager.GetPtr(), &DeviceManagerImpl::CreateDevice_MgrThread,
+ &device, pImpl, (DeviceBase*)0);
+ }
+ else
+ device = manager->CreateDevice_MgrThread(pImpl, (DeviceBase*)0);
+ }
+ return device;
+}
+
+void DeviceHandle::Clear()
+{
+ if (pImpl)
+ {
+ pImpl->Release();
+ pImpl = 0;
+ }
+}
+
+bool DeviceHandle::enumerateNext(const DeviceEnumerationArgs& args)
+{
+ if (GetType() == Device_None)
+ return false;
+
+ Ptr<DeviceManagerImpl> managerKeepAlive;
+ Lock::Locker lockScope(pImpl->GetLock());
+
+ DeviceCreateDesc* next = pImpl;
+ // If manager was destroyed, we get removed from the list.
+ if (!pImpl->pNext)
+ return false;
+
+ managerKeepAlive = next->GetManagerImpl();
+ OVR_ASSERT(managerKeepAlive);
+
+ do {
+ next = next->pNext;
+
+ if (managerKeepAlive->Devices.IsNull(next))
+ {
+ pImpl->Release();
+ pImpl = 0;
+ return false;
+ }
+
+ } while(!args.MatchRule(next->Type, next->Enumerated));
+
+ next->AddRef();
+ pImpl->Release();
+ pImpl = next;
+
+ return true;
+}
+
+} // namespace OVR
+