swSynth.h

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#pragma once
 
#include <stdint.h>
#include <stdbool.h>
 
#include "fp_math.h"
 
//==============================================================================
// Defines
//==============================================================================
 
#define SPK_MAX_VOLUME 255
 
//==============================================================================
// Enums
//==============================================================================
 
typedef enum
{
    SHAPE_SINE,     
    SHAPE_SAWTOOTH, 
    SHAPE_TRIANGLE, 
    SHAPE_SQUARE,   
    SHAPE_NOISE,    
} oscillatorShape_t;
 
//==============================================================================
// Unions
//==============================================================================
 
typedef union
{
    uint32_t accum32; 
    uint8_t bytes[4]; 
} oscAccum_t;
 
//==============================================================================
// Typedefs
//==============================================================================
 
typedef int8_t (*waveFunc_t)(uint16_t idx, void* data);
 
//==============================================================================
// Structs
//==============================================================================
 
typedef struct
{
    waveFunc_t waveFunc;    
    void* waveFuncData;     
    oscAccum_t accumulator; 
    int32_t stepSize;       
    uint32_t tVol;          
    uint32_t cVol;          
    uint8_t chorus;         
} synthOscillator_t;
 
//==============================================================================
// Function prototypes
//==============================================================================
 
void swSynthInitOscillator(synthOscillator_t* osc, oscillatorShape_t shape, uint32_t freq, uint8_t volume);
void swSynthInitOscillatorWave(synthOscillator_t* osc, waveFunc_t waveFunc, void* waveData, uint32_t freq,
                               uint8_t volume);
void swSynthSetShape(synthOscillator_t* osc, oscillatorShape_t shape);
void swSynthSetWaveFunc(synthOscillator_t* osc, waveFunc_t waveFunc, void* waveFuncData);
void swSynthSetFreq(synthOscillator_t* osc, uint32_t freq);
void swSynthSetFreqPrecise(synthOscillator_t* osc, uq16_16 freq);
void swSynthSetVolume(synthOscillator_t* osc, uint8_t volume);
uint8_t swSynthMixOscillators(synthOscillator_t* oscillators[], uint16_t numOscillators);
int32_t swSynthSumOscillators(synthOscillator_t* oscillators[], uint16_t numOscillators);
int8_t swSynthSampleWave(oscillatorShape_t shape, uint8_t idx);