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// This code contains NVIDIA Confidential Information and is disclosed to you
// under a form of NVIDIA software license agreement provided separately to you.
//
// Notice
// NVIDIA Corporation and its licensors retain all intellectual property and
// proprietary rights in and to this software and related documentation and
// any modifications thereto. Any use, reproduction, disclosure, or
// distribution of this software and related documentation without an express
// license agreement from NVIDIA Corporation is strictly prohibited.
//
// ALL NVIDIA DESIGN SPECIFICATIONS, CODE ARE PROVIDED "AS IS.". NVIDIA MAKES
// NO WARRANTIES, EXPRESSED, IMPLIED, STATUTORY, OR OTHERWISE WITH RESPECT TO
// THE MATERIALS, AND EXPRESSLY DISCLAIMS ALL IMPLIED WARRANTIES OF NONINFRINGEMENT,
// MERCHANTABILITY, AND FITNESS FOR A PARTICULAR PURPOSE.
//
// Information and code furnished is believed to be accurate and reliable.
// However, NVIDIA Corporation assumes no responsibility for the consequences of use of such
// information or for any infringement of patents or other rights of third parties that may
// result from its use. No license is granted by implication or otherwise under any patent
// or patent rights of NVIDIA Corporation. Details are subject to change without notice.
// This code supersedes and replaces all information previously supplied.
// NVIDIA Corporation products are not authorized for use as critical
// components in life support devices or systems without express written approval of
// NVIDIA Corporation.
//
// 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.
#pragma once
namespace nv
{
namespace cloth
{
// acts as a poor mans random access iterator
template <typename T4f, typename BaseIterator>
class LerpIterator
{
LerpIterator& operator = (const LerpIterator&); // not implemented
public:
LerpIterator(BaseIterator start, BaseIterator target, float alpha)
: mAlpha(simd4f(alpha)), mStart(start), mTarget(target)
{
}
// return the interpolated point at a given index
inline T4f operator[](size_t index) const
{
return mStart[index] + (mTarget[index] - mStart[index]) * mAlpha;
}
inline T4f operator*() const
{
return (*this)[0];
}
// prefix increment only
inline LerpIterator& operator ++ ()
{
++mStart;
++mTarget;
return *this;
}
private:
// interpolation parameter
const T4f mAlpha;
BaseIterator mStart;
BaseIterator mTarget;
};
template <typename T4f, size_t Stride>
class UnalignedIterator
{
UnalignedIterator& operator = (const UnalignedIterator&); // not implemented
public:
UnalignedIterator(const float* pointer) : mPointer(pointer)
{
}
inline T4f operator[](size_t index) const
{
return load(mPointer + index * Stride);
}
inline T4f operator*() const
{
return (*this)[0];
}
// prefix increment only
inline UnalignedIterator& operator ++ ()
{
mPointer += Stride;
return *this;
}
private:
const float* mPointer;
};
// acts as an iterator but returns a constant
template <typename T4f>
class ConstantIterator
{
public:
ConstantIterator(const T4f& value) : mValue(value)
{
}
inline T4f operator*() const
{
return mValue;
}
inline ConstantIterator& operator ++ ()
{
return *this;
}
private:
ConstantIterator& operator = (const ConstantIterator&);
const T4f mValue;
};
// wraps an iterator with constant scale and bias
template <typename T4f, typename BaseIterator>
class ScaleBiasIterator
{
public:
ScaleBiasIterator(BaseIterator base, const T4f& scale, const T4f& bias)
: mScale(scale), mBias(bias), mBaseIterator(base)
{
}
inline T4f operator*() const
{
return (*mBaseIterator) * mScale + mBias;
}
inline ScaleBiasIterator& operator ++ ()
{
++mBaseIterator;
return *this;
}
private:
ScaleBiasIterator& operator = (const ScaleBiasIterator&);
const T4f mScale;
const T4f mBias;
BaseIterator mBaseIterator;
};
} // namespace cloth
} // namespace nv
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