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#ifndef OSC_H
#define OSC_H
#include <math.h>
/**
* The main idea of the osc is the following:
* The root of the sound is a periodic wave function.
* This can be a stored period of a wave in a wavetable
* or a function like sin(). In order to play a sound with
* the wave an external float offset is kept that points to the
* next sample, a function is provided to advance this offset
* a calucalted step amount, depending on the desired frequency.
* Linear interpolation is used so that a float offset can work
* and provide autosmoothing.
*/
enum osc_type {
WAVE,
SAMPLE
};
typedef struct osc_t {
char name[16];
float * data;
long len;
long start;
long end;
enum osc_type type;
} osc_t;
/* Initializes the wavetables and functions for the oscilators */
void init_osc();
float osc_interpolate(float offset, float start, float end);
float osc_next_offset(osc_t * osc, float f, float offset);
int osc_next_index(osc_t * osc, float offset);
int osc_load_wav(osc_t * osc, const char * path);
/***************/
/* OSCILATORS */
/***************/
#define OSC_COMMON(osc) \
void \
set_##osc##_start(long start) \
{ OSC_##osc.start = start; } \
void \
set_##osc##_end(long end) \
{ OSC_##osc.end = end; }
#define OSC_COMMON_H(osc) \
void \
set_##osc##_start(long start); \
void \
set_##osc##_end(long end); \
float \
osc_##osc(float offset); \
float \
osc_##osc##_next(float f, float offset);
/*****************/
/* osc functions */
/*****************/
OSC_COMMON_H(tri)
OSC_COMMON_H(sin)
OSC_COMMON_H(weird)
OSC_COMMON_H(sound)
#endif /* OSC_H */
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