RandPool.cpp

//==================================================================
class RandPool
{
    DVec<U32>   mVals;
    size_t      mIterIdx;

public:
    RandPool( size_t size, U32 seed=0 )
        : mIterIdx(0)
    {
        DUT::RandMT rand( seed );

        mVals.resize( size );

        for (size_t i=0; i < size; ++i)
            mVals[i] = rand.randomMT();
    }

    void IterStart( size_t idx )
    {
        mIterIdx = idx % mVals.size();
    }

    U32 IterNext()
    {
        U32 val = mVals[mIterIdx];

        mIterIdx += 1;
        if ( mIterIdx >= mVals.size() )
            mIterIdx = 0;

        return val;
    }

    float IterNextFloat()
    {
        const U32   PRECISION_N1 = (1 << 16) - 1;
        const float OO_PRECISION = 1.f / (float)PRECISION_N1;
        return (float)(IterNext() & PRECISION_N1) * OO_PRECISION;
    }

    float IterNextRangef( float a, float b )
    {
        return a + (b - a) * IterNextFloat();
    }
};