NvBlastIndexFns.h

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#ifndef NVBLASTINDEXFNS_H
#define NVBLASTINDEXFNS_H


#include "NvBlastTypes.h"

#include <cstring>


namespace Nv
{
namespace Blast
{

template<typename T>
NV_INLINE T invalidIndex()
{
    return ~(T)0;
}


template<typename T>
NV_INLINE bool isInvalidIndex(T index)
{
    return index == invalidIndex<T>();
}


template<typename T>
void createIndexStartLookup(T* lookup, T indexBase, T indexRange, T* indexSource, T indexCount, T indexByteStride)
{
    ++indexBase;    // Ordering invalidIndex<T>() as lowest value
    T indexPos = 0;
    for (T i = 0; i <= indexRange; ++i)
    {
        for (; indexPos < indexCount; ++indexPos, indexSource = (T*)((uintptr_t)indexSource + indexByteStride))
        {
            if (*indexSource + 1 >= i + indexBase)  // +1 to order invalidIndex<T>() as lowest value
            {
                lookup[i] = indexPos;
                break;
            }
        }
        if (indexPos == indexCount)
        {
            lookup[i] = indexPos;
        }
    }
    lookup[indexRange + 1] = indexCount;
}


template<typename T>
void invertMap(T* inverseMap, const T* map, const T size)
{
    memset(inverseMap, invalidIndex<T>(), size*sizeof(T));

    for (T i = 0; i < size; i++)
    {
        if (!isInvalidIndex(map[i]))
        {
            inverseMap[map[i]] = i;
        }
    }
}

} // end namespace Blast
} // end namespace Nv


#endif // #ifndef NVBLASTINDEXFNS_H