GrainPlayer.hpp

#pragma once

#include <stdint.h>
#include <stdlib.h>
#include <boost/intrusive/list.hpp>

#include "Grain.hpp"
#include "fabricMaths.hpp"
#include "LinearSmoother.h"

#define MAX_GRAINS 128

struct GrainPlayerControl
{
    float scanSpeed = 1.f;
    float spray = 0.01f;
    float density = 0.01f;
    float length = 0.01f;
    float gainSpray = 0.f;
    float direction = 1.0f;
    float pitch = 1.f;
    float pitchSpray = 0.f;
    float stereoWidth = 1.f;
    float panSpray = 1.f;
    float sides = 0.5f;
    float tilt = 0.f;
    float playHeadPos = 0.f;
    float sampleRate = 44100.f;
};

class GrainPlayer
{
public:
    using GrainList = boost::intrusive::list<Grain>;

    Grain grainArray[MAX_GRAINS];
    GrainList grains_used;
    GrainList grains_free;


    GrainPlayer();
    virtual ~GrainPlayer();
    void generate(float** outputs, float** st_audioBuffer, int bufferSize, uint32_t frames);
    GrainPlayerControl controls;

private:
    uint32_t _frames;
    int _nextGrainTime = {0};
    int _bufferSize = {0};
    bool addGrain(int currentFrame);
    void generateSubdivision(float** outputs, float** st_audioBuffer, int bufferSize, uint32_t subdivStart, uint32_t subdivFrames);
    void processSmoothers(uint32_t frames);

    fabricMaths::fast_rand m_seed;
    fabricMaths::fast_real_distribution<float> m_fRandomNormalized;
    fabricMaths::fast_real_distribution<float> m_fRandomBiPolNormalized; 

    LinearSmoother m_pitchSmooth;
    float * m_pitchSmoothData;

    LinearSmoother m_lengthSmooth;
    float * m_lengthSmoothData;
};