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/* SPDX-License-Identifier: BSD-3-Clause */
/* SPDX-FileCopyrightText: Olivier Lapicque */
/* SPDX-FileCopyrightText: OpenMPT Project Developers and Contributors */
#pragma once
#include "openmpt/all/BuildSettings.hpp"
#include "mpt/base/arithmetic_shift.hpp"
#include "mpt/base/macros.hpp"
#include "mpt/random/random.hpp"
#include "openmpt/base/Types.hpp"
#include "openmpt/random/ModPlug.hpp"
#include "openmpt/soundbase/MixSample.hpp"
#include "openmpt/soundbase/MixSampleConvert.hpp"
OPENMPT_NAMESPACE_BEGIN
struct Dither_ModPlug
{
public:
using prng_type = mpt::rng::modplug_dither;
template <typename Trd>
static prng_type prng_init(Trd &)
{
return prng_type{0, 0};
}
public:
template <uint32 targetbits, typename Trng>
MPT_FORCEINLINE MixSampleInt process(MixSampleInt sample, Trng &rng)
{
if constexpr(targetbits == 0)
{
MPT_UNREFERENCED_PARAMETER(rng);
return sample;
} else if constexpr(targetbits + MixSampleIntTraits::mix_headroom_bits + 1 >= 32)
{
MPT_UNREFERENCED_PARAMETER(rng);
return sample;
} else
{
sample += mpt::rshift_signed(static_cast<int32>(mpt::random<uint32>(rng)), (targetbits + MixSampleIntTraits::mix_headroom_bits + 1));
return sample;
}
}
template <uint32 targetbits, typename Trng>
MPT_FORCEINLINE MixSampleFloat process(MixSampleFloat sample, Trng &prng)
{
return mix_sample_cast<MixSampleFloat>(process<targetbits>(mix_sample_cast<MixSampleInt>(sample), prng));
}
};
OPENMPT_NAMESPACE_END
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