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// Copyright (c) 2008-2020 NVIDIA Corporation. All rights reserved.
// Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
// Copyright (c) 2001-2004 NovodeX AG. All rights reserved.

#ifndef PSFOUNDATION_PSUTILITIES_H
#define PSFOUNDATION_PSUTILITIES_H

#include "foundation/PxVec3.h"
#include "NvCloth/ps/Ps.h"
#include "NvCloth/ps/PsIntrinsics.h"
#include "NvCloth/ps/PsBasicTemplates.h"
#include "NvCloth/Callbacks.h"

/** \brief NVidia namespace */
namespace nv
{
/** \brief nvcloth namespace */
namespace cloth
{
namespace ps
{

PX_INLINE char littleEndian()
{
	int i = 1;
	return *(reinterpret_cast<char*>(&i));
}

// PT: checked casts
PX_CUDA_CALLABLE PX_FORCE_INLINE physx::PxU32 to32(physx::PxU64 value)
{
	NV_CLOTH_ASSERT(value <= 0xffffffff);
	return physx::PxU32(value);
}
PX_CUDA_CALLABLE PX_FORCE_INLINE physx::PxU16 to16(physx::PxU32 value)
{
	NV_CLOTH_ASSERT(value <= 0xffff);
	return physx::PxU16(value);
}
PX_CUDA_CALLABLE PX_FORCE_INLINE physx::PxU8 to8(physx::PxU16 value)
{
	NV_CLOTH_ASSERT(value <= 0xff);
	return physx::PxU8(value);
}
PX_CUDA_CALLABLE PX_FORCE_INLINE physx::PxU8 to8(physx::PxU32 value)
{
	NV_CLOTH_ASSERT(value <= 0xff);
	return physx::PxU8(value);
}
PX_CUDA_CALLABLE PX_FORCE_INLINE physx::PxU8 to8(physx::PxI32 value)
{
	NV_CLOTH_ASSERT(value <= 0xff);
	NV_CLOTH_ASSERT(value >= 0);
	return physx::PxU8(value);
}
PX_CUDA_CALLABLE PX_FORCE_INLINE physx::PxI8 toI8(physx::PxU32 value)
{
	NV_CLOTH_ASSERT(value <= 0x7f);
	return physx::PxI8(value);
}

/*!
Get number of elements in array
*/
template <typename T, size_t N>
char (&ArraySizeHelper(T (&array)[N]))[N];
#define PX_ARRAY_SIZE(_array) (sizeof(nv::cloth::ps::ArraySizeHelper(_array)))

/*!
Sort two elements using operator<

On return x will be the smaller of the two
*/
template <class T>
PX_CUDA_CALLABLE PX_FORCE_INLINE void order(T& x, T& y)
{
	if(y < x)
		swap(x, y);
}

// most architectures can do predication on real comparisons, and on VMX, it matters

PX_CUDA_CALLABLE PX_FORCE_INLINE void order(physx::PxReal& x, physx::PxReal& y)
{
	physx::PxReal newX = physx::PxMin(x, y);
	physx::PxReal newY = physx::PxMax(x, y);
	x = newX;
	y = newY;
}

/*!
Sort two elements using operator< and also keep order
of any extra data
*/
template <class T, class E1>
PX_CUDA_CALLABLE PX_FORCE_INLINE void order(T& x, T& y, E1& xe1, E1& ye1)
{
	if(y < x)
	{
		swap(x, y);
		swap(xe1, ye1);
	}
}

#if PX_GCC_FAMILY && !PX_EMSCRIPTEN && !PX_LINUX
__attribute__((noreturn))
#endif
    PX_INLINE void debugBreak()
{
#if PX_WINDOWS || PX_XBOXONE
	__debugbreak();
#elif PX_ANDROID
	raise(SIGTRAP); // works better than __builtin_trap. Proper call stack and can be continued.
#elif PX_LINUX
	#if (PX_X64 || PX_X64)
		asm("int $3");
	#else
		raise(SIGTRAP);
	#endif
#elif PX_GCC_FAMILY
	__builtin_trap();
#else
	NV_CLOTH_ASSERT(false);
#endif
}

bool checkValid(const float&);
bool checkValid(const physx::PxVec3&);
bool checkValid(const physx::PxQuat&);
bool checkValid(const physx::PxMat33&);
bool checkValid(const physx::PxTransform&);
bool checkValid(const char*);

// equivalent to std::max_element
template <typename T>
inline const T* maxElement(const T* first, const T* last)
{
	const T* m = first;
	for(const T* it = first + 1; it < last; ++it)
		if(*m < *it)
			m = it;

	return m;
}

} // namespace ps
} // namespace cloth
} // namespace nv

#endif