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#include "SampleRandomPrecomputed.h"
#include "PhysXSample.h"
#include "SampleAllocator.h"
#include "PxTkStream.h"

using namespace PxToolkit;

#define WRITE_SEQUENCE 0

PX_FORCE_INLINE PxF32 flip(const PxF32* v)
{
	const PxU8* b = (const PxU8*)v;
	PxF32 f;
	PxU8* bf = (PxU8*)&f;
	bf[0] = b[3];
	bf[1] = b[2];
	bf[2] = b[1];
	bf[3] = b[0];
	return f;
}

SampleRandomPrecomputed::SampleRandomPrecomputed(PhysXSample& app)
: mPrecomputedRandomSequence(NULL),
  mPrecomputedRandomSequenceCount(0)
{
	mPrecomputedRandomSequence = (PxF32*)SAMPLE_ALLOC(sizeof(PxF32)*(PRECOMPUTED_RANDOM_SEQUENCE_SIZE+1));

#if WRITE_SEQUENCE
	char buffer[256];
	const char* filename = getSampleOutputDirManager().getFilePath("SampleBaseRandomSequence", buffer, false);
	const PxF32 denom = (1.0f / float(RAND_MAX));
	for(PxU32 i=0;i<PRECOMPUTED_RANDOM_SEQUENCE_SIZE;i++)
	{
		mPrecomputedRandomSequence[i] = float(rand()) * denom;
	}
	mPrecomputedRandomSequence[PRECOMPUTED_RANDOM_SEQUENCE_SIZE]=1.0f;
	PxDefaultFileOutputStream stream(filename);
	stream.write(mPrecomputedRandomSequence,sizeof(PxF32)*(PRECOMPUTED_RANDOM_SEQUENCE_SIZE+1));

#else
	const char* filename = getSampleMediaFilename("SampleBaseRandomSequence");
	PxDefaultFileInputData stream(filename);
	if(!stream.isValid())
		app.fatalError("SampleBaseRandomSequence file not found");
	stream.read(mPrecomputedRandomSequence,sizeof(PxF32)*(PRECOMPUTED_RANDOM_SEQUENCE_SIZE+1));

	const bool mismatch = (1.0f != mPrecomputedRandomSequence[PRECOMPUTED_RANDOM_SEQUENCE_SIZE]);
	if(mismatch)
	{
		for(PxU32 i=0;i<PRECOMPUTED_RANDOM_SEQUENCE_SIZE;i++)
		{
			mPrecomputedRandomSequence[i]=flip(&mPrecomputedRandomSequence[i]);
		}
	}

#endif
}

SampleRandomPrecomputed::~SampleRandomPrecomputed()
{
	SAMPLE_FREE(mPrecomputedRandomSequence);
	mPrecomputedRandomSequenceCount=0;
}