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#include "osc.h"
osc_t OSC_tri = {
.name = "w_triangle",
.start = 0,
.len = 4,
};
static float
tri(int index)
{
if (index == 0) return 0.0f;
else if (index == 1) return 1.0f;
else if (index == 2) return 0.0f;
else if (index == 3) return -1.0f;
//else return 0.0f;
}
float
osc_tri(float offset)
{
return osc_interpolate(offset,
tri((int)offset),
tri(osc_next_index(&OSC_tri, offset)));
}
float
osc_tri_next(float f, float offset)
{
return osc_next_offset(&OSC_tri, f, offset);
}
static float
tri_sample(osc_t * osc, float offset)
{
return osc_interpolate(offset,
tri((int)offset),
tri(osc_next_index(osc, offset)));
}
static float
tri_next(osc_t * osc, float f, float offset)
{
return osc_next_offset(osc, f, offset);
}
static const struct osc_ops osc_operations = {
.sample = tri_sample,
.next = tri_next,
};
osc_t *
make_tri(const char * name)
{
osc_t * osc = (osc_t *)malloc(sizeof(osc_t));
int len = strlen(name);
strncpy(osc->name, name, 16);
osc->data = NULL;
osc->len = 2;
osc->start = 0;
osc->type = WAVE;
osc->ops = &osc_operations;
return osc;
}
void
free_tri(osc_t * osc)
{
free(osc);
}
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