cp_rotations.h

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#pragma once

#include <cugar/basic/numbers.h>

namespace cugar {

template <typename Generator, typename Iterator = const float*>
struct CP_rotator
{
    CUGAR_HOST_DEVICE CP_rotator(Generator& gen, Iterator rot, uint32 size, uint32 dim = 0) :
        m_gen( gen ), m_rot( rot ), m_size( size ), m_dim( dim ) {}

    inline CUGAR_HOST_DEVICE float next()
    {
        return cugar::mod( m_gen.next() + m_rot[m_dim++ & (m_size-1)], 1.0f );
    }
    inline CUGAR_HOST_DEVICE float density(const float x) const
    {
        return 1.0f;
    }

    Generator&        m_gen;
    Iterator          m_rot;
    uint32            m_size;
    uint32            m_dim;
};

template <typename Sample_sequence, typename Iterator = const float*>
struct CP_rotated_sequence
{
    typedef CP_rotator<typename Sample_sequence::Sampler_type, Iterator> Sampler_type;

    CUGAR_HOST_DEVICE CP_rotated_sequence(Sample_sequence& sequence, const uint32 dims, Iterator rot, uint32 size) :
        m_sequence( sequence ), m_rot( rot ), m_size( size ), m_dims( dims ) {}

    Sampler_type CUGAR_HOST_DEVICE instance(const uint32 index, const uint32 copy) const
    {
        return Sampler_type( m_sequence.instance( index, copy ), m_rot, m_dims * m_size, copy * m_dims );
    }

    Sample_sequence&    m_sequence;
    Iterator            m_rot;
    uint32              m_size;
    uint32              m_dims;
};

} // namespace cugar