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