spectral_jitter.hpp

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#pragma once
 
#include <cstdint>

namespace pulp::gpu_audio {
 
constexpr float kSpectralTwoPi = 6.2831853071795864f;

inline float spectral_phase_hash(std::uint32_t bin, std::uint32_t seed) {
    std::uint32_t h = bin * 2654435761u + seed * 40503u;
    h = (h ^ (h >> 15u)) * 2246822519u;
    h = (h ^ (h >> 13u)) * 3266489917u;
    h = h ^ (h >> 16u);
    return static_cast<float>(h >> 8u) / 16777216.0f - 0.5f;
}

inline std::uint32_t advance_spectral_seed(std::uint32_t seed) {
    return seed * 1664525u + 1013904223u;
}

constexpr std::uint32_t kSpectralSeedInit = 0x9E3779B9u;
 
} // namespace pulp::gpu_audio