/* Compute f(i,el) for the current i. */
int osc_get(osc_t *osc, int el)
{
if (!osc)
return 0;
switch (osc->type) {
case otyp_Constant:
return osc->u.oconstant.val;
case otyp_Bounce:
return osc->u.obounce.val;
case otyp_Wrap:
return osc->u.owrap.val;
case otyp_VeloWrap:
return osc->u.ovelowrap.val;
case otyp_Linear:
return osc_get(osc->u.olinear.base, el)
+ el * osc_get(osc->u.olinear.diff, el);
case otyp_Multiplex: {
struct omultiplex_struct *ox = &(osc->u.omultiplex);
int sel = osc_get(ox->sel, el);
return osc_get(ox->val[sel % NUM_PHASES], el);
}
case otyp_Phaser: {
struct ophaser_struct *ox = &(osc->u.ophaser);
return ox->curphase;
}
case otyp_RandPhaser: {
struct orandphaser_struct *ox = &(osc->u.orandphaser);
return ox->curphase;
}
case otyp_Buffer: {
struct obuffer_struct *ox = &(osc->u.obuffer);
return ox->el[(ox->firstel + el) % NUM_ELS];
}
default:
return 0;
}
}
osc_t *new_osc_buffer(osc_t *val)
{
int ix;
osc_t *osc = create_osc(otyp_Buffer);
if (!osc)
return NULL;
osc->u.obuffer.val = val;
osc->u.obuffer.firstel = NUM_ELS-1;
/* The last N values are stored in a ring buffer, which we must initialize
here. */
for (ix=0; ix<NUM_ELS; ix++) {
osc->u.obuffer.el[ix] = osc_get(val, 0);
}
return osc;
}
osc_t *new_osc_buffer(stonerview_state *st, osc_t *val)
{
int ix;
osc_t *osc = create_osc(st, otyp_Buffer);
if (!osc)
return NULL;
osc->u.obuffer.val = val;
osc->u.obuffer.firstel = st->num_els-1;
/* The last N values are stored in a ring buffer, which we must initialize
here. */
for (ix=0; ix<st->num_els; ix++) {
osc->u.obuffer.el[ix] = osc_get(st, val, 0);
}
return osc;
}
/* Increment i. This affects all osc_t objects; we go down the linked list to
get them all. */
void osc_increment()
{
osc_t *osc;
for (osc = oscroot; osc; osc = osc->next) {
switch (osc->type) {
case otyp_Bounce: {
struct obounce_struct *ox = &(osc->u.obounce);
ox->val += ox->step;
if (ox->val < ox->min && ox->step < 0) {
ox->step = -(ox->step);
ox->val = ox->min + (ox->min - ox->val);
}
if (ox->val > ox->max && ox->step > 0) {
ox->step = -(ox->step);
ox->val = ox->max + (ox->max - ox->val);
}
break;
}
case otyp_Wrap: {
struct owrap_struct *ox = &(osc->u.owrap);
ox->val += ox->step;
if (ox->val < ox->min && ox->step < 0) {
ox->val += (ox->max - ox->min);
}
if (ox->val > ox->max && ox->step > 0) {
ox->val -= (ox->max - ox->min);
}
break;
}
case otyp_VeloWrap: {
struct ovelowrap_struct *ox = &(osc->u.ovelowrap);
int diff = (ox->max - ox->min);
ox->val += osc_get(ox->step, 0);
while (ox->val < ox->min)
ox->val += diff;
while (ox->val > ox->max)
ox->val -= diff;
break;
}
case otyp_Phaser: {
struct ophaser_struct *ox = &(osc->u.ophaser);
ox->count++;
if (ox->count >= ox->phaselen) {
ox->count = 0;
ox->curphase++;
if (ox->curphase >= NUM_PHASES)
ox->curphase = 0;
}
break;
}
case otyp_RandPhaser: {
struct orandphaser_struct *ox = &(osc->u.orandphaser);
ox->count++;
if (ox->count >= ox->curphaselen) {
ox->count = 0;
ox->curphaselen = rand_range(ox->minphaselen, ox->maxphaselen);
ox->curphase++;
if (ox->curphase >= NUM_PHASES)
ox->curphase = 0;
}
break;
}
case otyp_Buffer: {
struct obuffer_struct *ox = &(osc->u.obuffer);
ox->firstel--;
if (ox->firstel < 0)
ox->firstel += NUM_ELS;
ox->el[ox->firstel] = osc_get(ox->val, 0);
/* We can assume that ox->val has already been incremented, since it
was created first. This is why new objects are put on the end
of the linked list... yeah, it's gross. */
break;
}
default:
break;
}
}
}
