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

#pragma once

#include "NvCloth/ps/PsMathUtils.h"

namespace nv
{
namespace cloth
{

#if !NV_SIMD_SIMD
uint32_t findBitSet(uint32_t mask)
{
	uint32_t result = 0;
	while (mask >>= 1)
		++result;
	return result;
}
#endif

inline Scalar4i intFloor(const Scalar4f& v)
{
	using nv::cloth::ps::floor;
	return Scalar4i(int(floor(v.f4[0])), int(floor(v.f4[1])), int(floor(v.f4[2])), int(floor(v.f4[3])));
}

inline Scalar4i horizontalOr(const Scalar4i& mask)
{
	return simd4i(mask.i4[0] | mask.i4[1] | mask.i4[2] | mask.i4[3]);
}

template <>
struct Gather<Scalar4i>
{
	inline Gather(const Scalar4i& index);
	inline Scalar4i operator()(const Scalar4i*) const;

	Scalar4i mIndex;
	Scalar4i mOutOfRange;
};

Gather<Scalar4i>::Gather(const Scalar4i& index)
{
	//index are grid positions

	uint32_t mask = /* sGridSize */ 8 - 1;

	// Get grid index (forced within range)
	mIndex.u4[0] = index.u4[0] & mask;
	mIndex.u4[1] = index.u4[1] & mask;
	mIndex.u4[2] = index.u4[2] & mask;
	mIndex.u4[3] = index.u4[3] & mask;

	// true (filled with all ones = -1) when gridSize <= index || index < 0
	mOutOfRange.i4[0] = index.u4[0] & ~mask ? 0 : -1;
	mOutOfRange.i4[1] = index.u4[1] & ~mask ? 0 : -1;
	mOutOfRange.i4[2] = index.u4[2] & ~mask ? 0 : -1;
	mOutOfRange.i4[3] = index.u4[3] & ~mask ? 0 : -1;
}

Scalar4i Gather<Scalar4i>::operator()(const Scalar4i* ptr) const
{
	//ptr points to the cone/sphere grid
	const int32_t* base = ptr->i4;
	const int32_t* index = mIndex.i4;
	const int32_t* mask = mOutOfRange.i4;
	return Scalar4i(base[index[0]] & mask[0], base[index[1]] & mask[1], base[index[2]] & mask[2],
	                base[index[3]] & mask[3]);
}

} // namespace cloth
} // namespace nv