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26 lines
611 B
26 lines
611 B
1 year ago
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/*
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* Copyright 2023 jacqueline <me@jacqueline.id.au>
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*
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* SPDX-License-Identifier: GPL-3.0-only
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*/
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#include "sample.hpp"
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#include <cstdint>
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#include "komihash.h"
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namespace sample {
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static uint64_t sSeed1{0};
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static uint64_t sSeed2{0};
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auto applyDither(int64_t src, uint_fast8_t bits) -> int32_t {
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uint64_t mask = 0xFFFFFFFF; // 32 ones
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mask >>= 32 - bits; // `bits` ones
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uint64_t noise = komirand(&sSeed1, &sSeed2) & mask; // `bits` random noise
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return std::clamp<int64_t>(src + noise, INT32_MIN, INT32_MAX);
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}
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} // namespace sample
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