Bump OculusVR RIFT SDK to 0.4.4

1 files changed, 318 insertions, 0 deletions

diff --git a/LibOVR/Src/Kernel/OVR_ThreadCommandQueue.h b/LibOVR/Src/Kernel/OVR_ThreadCommandQueue.h
new file mode 100644
index 0000000..9c2a7d3
--- /dev/null
+++ b/LibOVR/Src/Kernel/OVR_ThreadCommandQueue.h
@@ -0,0 +1,318 @@
+/************************************************************************************
+
+PublicHeader:   None
+Filename    :   OVR_ThreadCommandQueue.h
+Content     :   Command queue for operations executed on a thread
+Created     :   October 29, 2012
+Author      :   Michael Antonov
+
+Copyright   :   Copyright 2014 Oculus VR, LLC All Rights reserved.
+
+Licensed under the Oculus VR Rift SDK License Version 3.2 (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-3.2 
+
+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.
+
+************************************************************************************/
+
+#ifndef OVR_ThreadCommandQueue_h
+#define OVR_ThreadCommandQueue_h
+
+#include "../Kernel/OVR_Types.h"
+#include "../Kernel/OVR_List.h"
+#include "../Kernel/OVR_Atomic.h"
+#include "../Kernel/OVR_Threads.h"
+
+namespace OVR {
+
+class ThreadCommand;
+class ThreadCommandQueue;
+
+
+//-------------------------------------------------------------------------------------
+// ***** ThreadCommand
+
+// ThreadCommand is a base class implementation for commands stored in ThreadCommandQueue.
+class ThreadCommand
+{
+public:    
+    // NotifyEvent is used by ThreadCommandQueue::PushCallAndWait to notify the
+    // calling (producer)  thread when command is completed or queue slot is available.
+    class NotifyEvent : public ListNode<NotifyEvent>, public NewOverrideBase
+    {
+        Event E;
+    public:   
+        NotifyEvent() { }
+
+        void Wait()        { E.Wait(); }
+        void PulseEvent()  { E.PulseEvent(); }
+    };
+
+    // ThreadCommand::PopBuffer is temporary storage for a command popped off
+    // by ThreadCommandQueue::PopCommand. 
+    class PopBuffer
+    {
+        enum { MaxSize = 256 };
+
+        size_t Size;
+        union {            
+            uint8_t Buffer[MaxSize];
+            size_t Align;
+        };
+
+        ThreadCommand* toCommand() const { return (ThreadCommand*)Buffer; }
+
+    public:
+        PopBuffer() : Size(0) { }
+        ~PopBuffer();
+
+        void        InitFromBuffer(void* data);
+
+        bool        HasCommand() const  { return Size != 0; }
+        size_t      GetSize() const     { return Size; }
+        bool        NeedsWait() const   { return toCommand()->NeedsWait(); }
+        NotifyEvent* GetEvent() const   { return toCommand()->pEvent; }
+
+        // Execute the command and also notifies caller to finish waiting,
+        // if necessary.
+        void        Execute();
+    };
+    
+    uint16_t     Size;
+    bool         WaitFlag; 
+    bool         ExitFlag; // Marks the last exit command. 
+    NotifyEvent* pEvent;
+
+    ThreadCommand(size_t size, bool waitFlag, bool exitFlag = false)
+        : Size((uint16_t)size), WaitFlag(waitFlag), ExitFlag(exitFlag), pEvent(0) { }
+    virtual ~ThreadCommand() { }
+
+    bool          NeedsWait() const { return WaitFlag; }
+    size_t        GetSize() const   { return Size; }
+
+    virtual void            Execute() const = 0;
+    // Copy constructor used for serializing this to memory buffer.
+    virtual ThreadCommand*  CopyConstruct(void* p) const = 0;
+};
+
+
+//-------------------------------------------------------------------------------------
+
+// CleanType is a template that strips 'const' and '&' modifiers from the argument type;
+// for example, typename CleanType<A&>::Type is equivalent to A.
+template<class T> struct CleanType           { typedef T Type; };
+template<class T> struct CleanType<T&>       { typedef T Type; };
+template<class T> struct CleanType<const T>  { typedef T Type; };
+template<class T> struct CleanType<const T&> { typedef T Type; };
+
+// SelfType is a template that yields the argument type. This helps avoid conflicts with
+// automatic template argument deduction for function calls when identical argument
+// is already defined.
+template<class T> struct SelfType { typedef T Type; };
+
+
+
+//-------------------------------------------------------------------------------------
+// ThreadCommand specializations for member functions with different number of
+// arguments and argument types.
+
+// Used to return nothing from a ThreadCommand, to avoid problems with 'void'.
+struct Void
+{
+    Void() {}
+    Void(int) {}
+};
+
+// ThreadCommand for member function with 0 arguments.
+template<class C, class R>
+class ThreadCommandMF0 : public ThreadCommand
+{   
+    typedef R (C::*FnPtr)();
+    C*      pClass;
+    FnPtr   pFn;
+    R*      pRet;
+
+    void executeImpl() const
+    {
+        pRet ? (void)(*pRet = (pClass->*pFn)()) :
+	           (void)(pClass->*pFn)();
+    }
+
+public:    
+    ThreadCommandMF0(C* pclass, FnPtr fn, R* ret, bool needsWait)
+        : ThreadCommand(sizeof(ThreadCommandMF0), needsWait),
+          pClass(pclass), pFn(fn), pRet(ret) { }
+
+    virtual void           Execute() const { executeImpl(); }
+    virtual ThreadCommand* CopyConstruct(void* p) const
+    { return Construct<ThreadCommandMF0>(p, *this); }
+};
+
+
+// ThreadCommand for member function with 1 argument.
+template<class C, class R, class A0>
+class ThreadCommandMF1 : public ThreadCommand
+{   
+    typedef R (C::*FnPtr)(A0);
+    C*                           pClass;
+    FnPtr                        pFn;
+    R*                           pRet;
+    typename CleanType<A0>::Type AVal0;
+
+    void executeImpl() const
+    {
+      pRet ? (void)(*pRet = (pClass->*pFn)(AVal0)) :
+	         (void)(pClass->*pFn)(AVal0);
+    }
+
+public:    
+    ThreadCommandMF1(C* pclass, FnPtr fn, R* ret, A0 a0, bool needsWait)
+        : ThreadCommand(sizeof(ThreadCommandMF1), needsWait),
+          pClass(pclass), pFn(fn), pRet(ret), AVal0(a0) { }
+
+    virtual void           Execute() const { executeImpl(); }
+    virtual ThreadCommand* CopyConstruct(void* p) const
+    { return Construct<ThreadCommandMF1>(p, *this); }
+};
+
+// ThreadCommand for member function with 2 arguments.
+template<class C, class R, class A0, class A1>
+class ThreadCommandMF2 : public ThreadCommand
+{   
+    typedef R (C::*FnPtr)(A0, A1);
+    C*                            pClass;
+    FnPtr                         pFn;
+    R*                            pRet;
+    typename CleanType<A0>::Type  AVal0;
+    typename CleanType<A1>::Type  AVal1;
+
+    void executeImpl() const
+    {
+        pRet ? (void)(*pRet = (pClass->*pFn)(AVal0, AVal1)) :
+	           (void)(pClass->*pFn)(AVal0, AVal1);
+    }
+
+public:    
+    ThreadCommandMF2(C* pclass, FnPtr fn, R* ret, A0 a0, A1 a1, bool needsWait)
+        : ThreadCommand(sizeof(ThreadCommandMF2), needsWait),
+          pClass(pclass), pFn(fn), pRet(ret), AVal0(a0), AVal1(a1) { }
+    
+    virtual void           Execute() const { executeImpl(); }
+    virtual ThreadCommand* CopyConstruct(void* p) const 
+    { return Construct<ThreadCommandMF2>(p, *this); }
+};
+
+
+//-------------------------------------------------------------------------------------
+// ***** ThreadCommandQueue
+
+// ThreadCommandQueue is a queue of executable function-call commands intended to be
+// serviced by a single consumer thread. Commands are added to the queue with PushCall
+// and removed with PopCall; they are processed in FIFO order. Multiple producer threads
+// are supported and will be blocked if internal data buffer is full.
+
+class ThreadCommandQueue
+{
+public:
+
+    ThreadCommandQueue();
+    virtual ~ThreadCommandQueue();
+
+
+    // Pops the next command from the thread queue, if any is available.
+    // The command should be executed by calling popBuffer->Execute().
+    // Returns 'false' if no command is available at the time of the call.
+    bool PopCommand(ThreadCommand::PopBuffer* popBuffer);
+
+    // Generic implementaion of PushCommand; enqueues a command for execution.
+    // Returns 'false' if push failed, usually indicating thread shutdown.
+    bool PushCommand(const ThreadCommand& command);
+
+    // 
+    void PushExitCommand(bool wait);
+
+    // Returns 'true' once ExitCommand has been processed, so the thread can shut down.
+    bool IsExiting() const;
+
+
+    // These two virtual functions serve as notifications for derived
+    // thread waiting.    
+    virtual void OnPushNonEmpty_Locked() { }
+    virtual void OnPopEmpty_Locked()     { }
+
+
+    // *** PushCall with no result
+    
+    // Enqueue a member function of 'this' class to be called on consumer thread.
+    // By default the function returns immediately; set 'wait' argument to 'true' to
+    // wait for completion.
+    template<class C, class R>
+    bool PushCall(R (C::*fn)(), bool wait = false)
+    { return PushCommand(ThreadCommandMF0<C,R>(static_cast<C*>(this), fn, 0, wait)); }       
+    template<class C, class R, class A0>
+    bool PushCall(R (C::*fn)(A0), typename SelfType<A0>::Type a0, bool wait = false)
+    { return PushCommand(ThreadCommandMF1<C,R,A0>(static_cast<C*>(this), fn, 0, a0, wait)); }
+    template<class C, class R, class A0, class A1>
+    bool PushCall(R (C::*fn)(A0, A1),
+                  typename SelfType<A0>::Type a0, typename SelfType<A1>::Type a1, bool wait = false)
+    { return PushCommand(ThreadCommandMF2<C,R,A0,A1>(static_cast<C*>(this), fn, 0, a0, a1, wait)); }
+    // Enqueue a specified member function call of class C.
+    // By default the function returns immediately; set 'wait' argument to 'true' to
+    // wait for completion.
+    template<class C, class R>
+    bool PushCall(C* p, R (C::*fn)(), bool wait = false)
+    { return PushCommand(ThreadCommandMF0<C,R>(p, fn, 0, wait)); }
+    template<class C, class R, class A0>
+    bool PushCall(C* p, R (C::*fn)(A0), typename SelfType<A0>::Type a0, bool wait = false)
+    { return PushCommand(ThreadCommandMF1<C,R,A0>(p, fn, 0, a0, wait)); }
+    template<class C, class R, class A0, class A1>
+    bool PushCall(C* p, R (C::*fn)(A0, A1),
+                  typename SelfType<A0>::Type a0, typename SelfType<A1>::Type a1, bool wait = false)
+    { return PushCommand(ThreadCommandMF2<C,R,A0,A1>(p, fn, 0, a0, a1, wait)); }
+    
+    
+    // *** PushCall with Result
+
+    // Enqueue a member function of 'this' class call and wait for call to complete
+    // on consumer thread before returning.
+    template<class C, class R>
+    bool PushCallAndWaitResult(R (C::*fn)(), R* ret)
+    { return PushCommand(ThreadCommandMF0<C,R>(static_cast<C*>(this), fn, ret, true)); }       
+    template<class C, class R, class A0>
+    bool PushCallAndWaitResult(R (C::*fn)(A0), R* ret, typename SelfType<A0>::Type a0)
+    { return PushCommand(ThreadCommandMF1<C,R,A0>(static_cast<C*>(this), fn, ret, a0, true)); }
+    template<class C, class R, class A0, class A1>
+    bool PushCallAndWaitResult(R (C::*fn)(A0, A1), R* ret,
+                               typename SelfType<A0>::Type a0, typename SelfType<A1>::Type a1)
+    { return PushCommand(ThreadCommandMF2<C,R,A0,A1>(static_cast<C*>(this), fn, ret, a0, a1, true)); }
+    // Enqueue a member function call for class C and wait for the call to complete
+    // on consumer thread before returning.
+    template<class C, class R>
+    bool PushCallAndWaitResult(C* p, R (C::*fn)(), R* ret)
+    { return PushCommand(ThreadCommandMF0<C,R>(p, fn, ret, true)); }
+    template<class C, class R, class A0>
+    bool PushCallAndWaitResult(C* p, R (C::*fn)(A0), R* ret, typename SelfType<A0>::Type a0)
+    { return PushCommand(ThreadCommandMF1<C,R,A0>(p, fn, ret, a0, true)); }
+    template<class C, class R, class A0, class A1>
+    bool PushCallAndWaitResult(C* p, R (C::*fn)(A0, A1), R* ret,
+                               typename SelfType<A0>::Type a0, typename SelfType<A1>::Type a1)
+    { return PushCommand(ThreadCommandMF2<C,R,A0,A1>(p, fn, ret, a0, a1, true)); }
+
+private:
+    class ThreadCommandQueueImpl* pImpl;
+};
+
+
+} // namespace OVR
+
+#endif // OVR_ThreadCommandQueue_h