PxCoreUtilityTypes.h

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#ifndef PX_CORE_UTILTY_TYPES_H
#define PX_CORE_UTILTY_TYPES_H

#include "foundation/PxAssert.h"
#include "foundation/PxMemory.h"

#if !PX_DOXYGEN
namespace physx
{
#endif


struct PxStridedData
{
    PxU32 stride;
    const void* data;

    PxStridedData() : stride( 0 ), data( NULL ) {}

    template<typename TDataType>
    PX_INLINE const TDataType& at( PxU32 idx ) const
    {
        PxU32 theStride( stride );
        if ( theStride == 0 )
            theStride = sizeof( TDataType );
        PxU32 offset( theStride * idx );
        return *(reinterpret_cast<const TDataType*>( reinterpret_cast< const PxU8* >( data ) + offset ));
    }
};

template<typename TDataType>
struct PxTypedStridedData
{
    PxU32 stride;
    const TDataType* data;

    PxTypedStridedData()
        : stride( 0 )
        , data( NULL )
    {
    }

};

struct PxBoundedData : public PxStridedData
{
    PxU32 count;
    PxBoundedData() : count( 0 ) {}
};

template<PxU8 TNumBytes>
struct PxPadding
{
    PxU8 mPadding[TNumBytes];
    PxPadding()
    {
        for ( PxU8 idx =0; idx < TNumBytes; ++idx )
            mPadding[idx] = 0;
    }
};

template <PxU32 NB_ELEMENTS> class PxFixedSizeLookupTable
{
//= ATTENTION! =====================================================================================
// Changing the data layout of this class breaks the binary serialization format.  See comments for 
// PX_BINARY_SERIAL_VERSION.  If a modification is required, please adjust the getBinaryMetaData 
// function.  If the modification is made on a custom branch, please change PX_BINARY_SERIAL_VERSION
// accordingly.
//==================================================================================================
public:
    
    PxFixedSizeLookupTable() 
        : mNbDataPairs(0)
    {
    }

    PxFixedSizeLookupTable(const PxEMPTY) {}

    PxFixedSizeLookupTable(const PxReal* dataPairs, const PxU32 numDataPairs)
    {
        PxMemCopy(mDataPairs,dataPairs,sizeof(PxReal)*2*numDataPairs);
        mNbDataPairs=numDataPairs;
    }

    PxFixedSizeLookupTable(const PxFixedSizeLookupTable& src)
    {
        PxMemCopy(mDataPairs,src.mDataPairs,sizeof(PxReal)*2*src.mNbDataPairs);
        mNbDataPairs=src.mNbDataPairs;
    }

    ~PxFixedSizeLookupTable()
    {
    }

    PxFixedSizeLookupTable& operator=(const PxFixedSizeLookupTable& src)
    {
        PxMemCopy(mDataPairs,src.mDataPairs,sizeof(PxReal)*2*src.mNbDataPairs);
        mNbDataPairs=src.mNbDataPairs;
        return *this;
    }

    PX_FORCE_INLINE void addPair(const PxReal x, const PxReal y)
    {
        PX_ASSERT(mNbDataPairs<NB_ELEMENTS);
        mDataPairs[2*mNbDataPairs+0]=x;
        mDataPairs[2*mNbDataPairs+1]=y;
        mNbDataPairs++;
    }

    PX_FORCE_INLINE PxReal getYVal(const PxReal x) const
    {
        if(0==mNbDataPairs)
        {
            PX_ASSERT(false);
            return 0;
        }

        if(1==mNbDataPairs || x<getX(0))
        {
            return getY(0);
        }

        PxReal x0=getX(0);
        PxReal y0=getY(0);

        for(PxU32 i=1;i<mNbDataPairs;i++)
        {
            const PxReal x1=getX(i);
            const PxReal y1=getY(i);

            if((x>=x0)&&(x<x1))
            {
                return (y0+(y1-y0)*(x-x0)/(x1-x0));
            }

            x0=x1;
            y0=y1;
        }

        PX_ASSERT(x>=getX(mNbDataPairs-1));
        return getY(mNbDataPairs-1);
    }

    PxU32 getNbDataPairs() const {return mNbDataPairs;}
    
    void clear()
    {
        memset(mDataPairs, 0, NB_ELEMENTS*2*sizeof(PxReal));
        mNbDataPairs = 0;
    }

    PX_FORCE_INLINE PxReal getX(const PxU32 i) const
    {
        return mDataPairs[2*i];
    }
    PX_FORCE_INLINE PxReal getY(const PxU32 i) const
    {
        return mDataPairs[2*i+1];
    }

    PxReal mDataPairs[2*NB_ELEMENTS];
    PxU32 mNbDataPairs;
    PxU32 mPad[3];

    
};

#if !PX_DOXYGEN
} // namespace physx
#endif

#endif