_common_2_ak_platform_funcs_8h

Wwise SDK 2022.1.12

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 released in source code form as part of the SDK installer package.
  
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 // AkPlatformFuncs.h
  
 /// \file 
 /// Platform-dependent functions definition.
  
 #ifndef _AK_TOOLS_COMMON_AKPLATFORMFUNCS_H
 #define _AK_TOOLS_COMMON_AKPLATFORMFUNCS_H
  
 #include <AK/SoundEngine/Common/AkTypes.h>
 #include <AK/SoundEngine/Common/AkAtomic.h>
  
 // Uncomment the following to enable built-in platform profiler markers in the sound engine
 //#define AK_ENABLE_INSTRUMENT
  
 #if defined(AK_WIN)
 #include <AK/Tools/Win32/AkPlatformFuncs.h>
  
 #elif defined (AK_XBOX)
 #include <AK/Tools/XboxOne/AkPlatformFuncs.h>
  
 #elif defined (AK_APPLE)
 #include <AK/Tools/Mac/AkPlatformFuncs.h>
 #include <AK/Tools/POSIX/AkPlatformFuncs.h>
  
 #elif defined( AK_ANDROID ) || defined ( AK_LINUX_AOSP ) 
 #include <AK/Tools/Android/AkPlatformFuncs.h>
  
 #elif defined (AK_PS4)
 #include <AK/Tools/PS4/AkPlatformFuncs.h>
  
 #elif defined (AK_PS5)
 #include <AK/Tools/PS5/AkPlatformFuncs.h>
  
 #elif defined (AK_EMSCRIPTEN)
 #include <AK/Tools/Emscripten/AkPlatformFuncs.h>
  
 #elif defined (AK_LINUX)
  
 #ifdef AK_GGP
 #include <AK/Tools/GGP/AkPlatformFuncs.h>
 #endif
 #include <AK/Tools/Linux/AkPlatformFuncs.h>
 #include <AK/Tools/POSIX/AkPlatformFuncs.h>
  
 #elif defined (AK_QNX)
 #include <AK/Tools/QNX/AkPlatformFuncs.h>
 #include <AK/Tools/POSIX/AkPlatformFuncs.h>
  
 #elif defined (AK_NX)
 #include <AK/Tools/NX/AkPlatformFuncs.h>
  
 #else
 #error AkPlatformFuncs.h: Undefined platform
 #endif
  
 #ifndef AkPrefetchZero
 #define AkPrefetchZero(___Dest, ___Size)
 #endif
  
 #ifndef AkPrefetchZeroAligned
 #define AkPrefetchZeroAligned(___Dest, ___Size)
 #endif
  
 #ifndef AkZeroMemAligned
 #define AkZeroMemAligned(___Dest, ___Size) AKPLATFORM::AkMemSet(___Dest, 0, ___Size);
 #endif
 #ifndef AkZeroMemLarge
 #define AkZeroMemLarge(___Dest, ___Size) AKPLATFORM::AkMemSet(___Dest, 0, ___Size);
 #endif
 #ifndef AkZeroMemSmall
 #define AkZeroMemSmall(___Dest, ___Size) AKPLATFORM::AkMemSet(___Dest, 0, ___Size);
 #endif
  
 #ifndef AkAllocaSIMD
 #ifdef __clang__
 #if __has_builtin( __builtin_alloca_with_align )
 #define AkAllocaSIMD( _size_ ) __builtin_alloca_with_align( _size_, 128 )
 #else
 // work around alloca alignment issues in versions of clang before 4.0
 #define AkAllocaSIMD( _size_ ) (void*)( ( ( uintptr_t )AkAlloca( _size_ + 16 ) + 0xF ) & ~0xF )
 #endif
 #else
 #define AkAllocaSIMD( _size_ ) AkAlloca( _size_ )
 #endif
 #endif
  
 #ifndef AK_THREAD_INIT_CODE
 #define AK_THREAD_INIT_CODE(_threadProperties)
 #endif
  
 /// Utility functions
 namespace AK
 {
     /// Count non-zero bits.
     /// \return Number of channels.
     AkForceInline AkUInt32 GetNumNonZeroBits( AkUInt32 in_uWord )
     {
         AkUInt32 num = 0;
         while( in_uWord ){ ++num; in_uWord &= in_uWord-1; }
         return num;
     }
  
     /// Computes the next power of two given a value.
     /// \return next power of two.
     AkForceInline AkUInt32 GetNextPowerOfTwo( AkUInt32 in_uValue )
     {
         in_uValue--;
         in_uValue |= in_uValue >> 1;
         in_uValue |= in_uValue >> 2;
         in_uValue |= in_uValue >> 4;
         in_uValue |= in_uValue >> 8;
         in_uValue |= in_uValue >> 16;
         in_uValue++;
         return in_uValue;
     }
  
     AkForceInline AkUInt32 ROTL32( AkUInt32 x, AkUInt32 r )
     {
         return ( x << r ) | ( x >> ( 32 - r ) );
     }
  
     AkForceInline AkUInt64 ROTL64( AkUInt64 x, AkUInt64 r )
     {
         return ( x << r ) | ( x >> ( 64 - r ) );
     }
 }
  
 /// Platform-dependent helpers
 namespace AKPLATFORM
 {
     inline void AkGetDefaultHighPriorityThreadProperties(AkThreadProperties& out_threadProperties)
     {
         AkGetDefaultThreadProperties(out_threadProperties);
         out_threadProperties.nPriority = AK_THREAD_PRIORITY_ABOVE_NORMAL;
     }
  
  
 #if defined _MSC_VER && defined AK_CPU_X86_64
     AkForceInline AkUInt32 AkBitScanForward64(unsigned long long in_bits)
     {
         unsigned long ret = 0;
         _BitScanForward64(&ret, in_bits);
         return ret;
     }
 #elif __clang__ || defined __GNUG__
     AkForceInline AkUInt32 AkBitScanForward64(AkUInt64 in_bits)
     {
         return __builtin_ctzll(in_bits);
     }
 #else
     AkForceInline AkUInt32 AkBitScanForward64(unsigned long long in_bits)
     {
         unsigned long ret = 0;
         if (in_bits)
         {
             while ((in_bits & 1ULL) == 0)
             {
                 in_bits >>= 1;
                 ret++;
             }
         }
         return ret;
     }
 #endif
  
 #if defined _MSC_VER
     AkForceInline AkUInt32 AkBitScanForward(unsigned long in_bits)
     {
         unsigned long ret = 0;
         _BitScanForward(&ret, in_bits);
         return ret;
     }
  
 #elif __clang__ || defined __GNUG__
     AkForceInline AkUInt32 AkBitScanForward(AkUInt32 in_bits)
     {
         return __builtin_ctzl(in_bits);
     }
 #else
     AkForceInline AkUInt32 AkBitScanForward(unsigned long in_bits)
     {
         unsigned long ret = 0;
         if (in_bits)
         {
             while ((in_bits & 1ULL) == 0)
             {
                 in_bits >>= 1;
                 ret++;
             }
         }
         return ret;
     }
 #endif
  
     // fallback implementations for when platform don't have their own implementation
 #if !defined(AK_LIMITEDSPINFORZERO)
     // Waits for a limited amount of time for in_pVal to hit zero (without yielding the thread)
     inline void AkLimitedSpinForZero(AkAtomic32* in_pVal)
     {
         AkInt64 endSpinTime = 0;
         AkInt64 currentTime = 0;
         PerformanceCounter(&endSpinTime);
         endSpinTime += AkInt64(AK::g_fFreqRatio * 0.01); // only spin for about 10us
         while (true)
         {
             // if pval is zero, skip out
             if (AkAtomicLoad32(in_pVal) == 0)
             {
                 break;
             }
             AkSpinHint();
  
             // Check if we've hit the deadline for the timeout
             PerformanceCounter(&currentTime);
             if (currentTime > endSpinTime)
             {
                 break;
             }
         }
     }
  
     // Waits for a limited amount of time for in_pVal to get atomically shift from the expected value to the proposed one
     // returns true if acquisition succeeded
     inline bool AkLimitedSpinToAcquire(AkAtomic32* in_pVal, AkInt32 in_proposed, AkInt32 in_expected)
     {
         if (AkAtomicCas32(in_pVal, in_proposed, in_expected))
         {
             return true;
         }
  
         // Cas failed, start the slower evaluation
         AkInt64 endSpinTime = 0;
         AkInt64 currentTime = 0;
         PerformanceCounter(&endSpinTime);
         endSpinTime += AkInt64(AK::g_fFreqRatio * 0.01); // only spin for about 10us
         while (true)
         {
             // attempt cas to acquire and if successful, skip out
             if (AkAtomicCas32(in_pVal, in_proposed, in_expected))
             {
                 return true;
             }
             AkSpinHint();
  
             // Check if we've hit the deadline for the timeout
             PerformanceCounter(&currentTime);
             if (currentTime > endSpinTime)
             {
                 return false;
             }
         }
     }
 #endif
  
     inline void AkSpinWaitForZero(AkAtomic32* in_pVal)
     {
         if (AkAtomicLoad32(in_pVal) == 0)
         {
             return;
         }
  
         // do a limited spin on-the-spot until in_pVal hits zero
         AkLimitedSpinForZero(in_pVal);
  
         // if in_pVal is still non-zero, then the other thread is either blocked or waiting for us.  Yield for real.
         while (AkAtomicLoad32(in_pVal))
             AkThreadYield();
     }
  
     // Waits for a limited amount of time for in_pVal to get atomically shift from 0 to 1
     inline void AkSpinToAcquire(AkAtomic32* in_pVal, AkInt32 in_proposed, AkInt32 in_expected)
     {
         // do a limited spin on-the-spot until in_pVal can successfully hit 1
         // or if it fails, then the other thread is either blocked or waiting for us.  Yield for real.
         while (!AkLimitedSpinToAcquire(in_pVal, in_proposed, in_expected))
         {
             AkThreadYield();
         }
     }
 }
  
 #ifndef AK_PERF_RECORDING_RESET
 #define AK_PERF_RECORDING_RESET()
 #endif
 #ifndef AK_PERF_RECORDING_START
 #define AK_PERF_RECORDING_START( __StorageName__, __uExecutionCountStart__, __uExecutionCountStop__ )
 #endif
 #ifndef AK_PERF_RECORDING_STOP
 #define AK_PERF_RECORDING_STOP( __StorageName__, __uExecutionCountStart__, __uExecutionCountStop__ )    
 #endif
  
 #endif // _AK_TOOLS_COMMON_AKPLATFORMFUNCS_H