pmj.h

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// SPDX-License-Identifier: Apache-2.0
// Copyright Contributors to the OpenQMC Project.
 
 
#pragma once
 
#include "gpu.h"
#include "lookup.h"
#include "sampler.h"
#include "state.h"
#include "stochastic.h"
 
#include <cstddef>
#include <cstdint>
 
namespace oqmc
{
 
class PmjImpl
{
    // See SamplerInterface for public API documentation.
    friend SamplerInterface<PmjImpl>;
 
    struct CacheType
    {
        std::uint32_t samples[State64Bit::maxIndexSize][4];
    };
 
    static constexpr std::size_t cacheSize = sizeof(CacheType);
    static void initialiseCache(void* cache);
 
    /*AUTO_DEFINED*/ PmjImpl() = default;
    OQMC_HOST_DEVICE PmjImpl(State64Bit state, const CacheType* cache);
    OQMC_HOST_DEVICE PmjImpl(int x, int y, int frame, int index,
                             const void* cache);
 
    OQMC_HOST_DEVICE PmjImpl newDomain(int key) const;
    OQMC_HOST_DEVICE PmjImpl newDomainSplit(int key, int size, int index) const;
    OQMC_HOST_DEVICE PmjImpl newDomainDistrib(int key, int index) const;
 
    template <int Size>
    OQMC_HOST_DEVICE void drawSample(std::uint32_t sample[Size]) const;
 
    template <int Size>
    OQMC_HOST_DEVICE void drawRnd(std::uint32_t rnd[Size]) const;
 
    State64Bit state;
    const CacheType* cache;
};
 
inline void PmjImpl::initialiseCache(void* cache)
{
    assert(cache);
 
    auto typedCache = static_cast<CacheType*>(cache);
 
    stochasticPmjInit(State64Bit::maxIndexSize, typedCache->samples);
}
 
inline PmjImpl::PmjImpl(State64Bit state, const CacheType* cache)
    : state(state), cache(cache)
{
    assert(cache);
}
 
inline PmjImpl::PmjImpl(int x, int y, int frame, int index, const void* cache)
    : state(x, y, frame, index), cache(static_cast<const CacheType*>(cache))
{
    assert(cache);
 
    state = state.pixelDecorrelate();
}
 
inline PmjImpl PmjImpl::newDomain(int key) const
{
    return {state.newDomain(key), cache};
}
 
inline PmjImpl PmjImpl::newDomainSplit(int key, int size, int index) const
{
    return {state.newDomainSplit(key, size, index), cache};
}
 
inline PmjImpl PmjImpl::newDomainDistrib(int key, int index) const
{
    return {state.newDomainDistrib(key, index), cache};
}
 
template <int Size>
void PmjImpl::drawSample(std::uint32_t sample[Size]) const
{
    shuffledScrambledLookup<4, Size>(
        state.sampleId, pcg::output(state.patternId), cache->samples, sample);
}
 
template <int Size>
void PmjImpl::drawRnd(std::uint32_t rnd[Size]) const
{
    state.drawRnd<Size>(rnd);
}
 
using PmjSampler = SamplerInterface<PmjImpl>;
 
} // namespace oqmc