oscLight
PIWT osc, needs to connect to a PIWT.
Inlets
bool32 disables the object
frac32.bipolar pitch
frac32.bipolar freq offset
Outlets
frac32buffer.bipolar wave
Parameters
frac32.s.map.pitch pitch
Attributes
objref piwt
Declaration
uint32_t p, dp; // phase and delta phase aka freq
int32_t I1_1;
int32_t inv;
Init
p = 0;
dp = 1;
I1_1 = 0;
Control Rate
if (!inlet_disable) {
int32_t nextDp;
MTOFEXTENDED(param_pitch + inlet_pitch, nextDp);
nextDp = ___SMMLA(0x01000000, inlet_freq_space_offset, nextDp);
nextDp >>= 32 - 22 - attr_piwt.LENGTHPOW;
// the float division execs in parallel with integer operations.
float nextInv = (((float)(1 << 16)) / arm::q_to_float(nextDp, 32));
for (int j = 0; j < BUFSIZE; j++) {
p += dp;
int32_t I1_0 = attr_piwt.I1p32(p);
outlet_wave[j] = ___SMMUL(I1_0 - I1_1, inv) << 13;
I1_1 = I1_0;
}
dp = nextDp;
inv = (int32_t)nextInv;
} else { // disabled
for (int j = 0; j < BUFSIZE; j++) {
outlet_wave[j] = 0;
}
}