read interp fract
read from table, linear interpolated.'offset' and 'range' define the area inside the table to read from.
Inlets
frac32buffer.positive index in fraction of table size
frac32.positive offset
frac32.positive range
Outlets
frac32buffer table[a]
Attributes
objref table
Declaration
int32_t max;
int32_t offset;
uint8_t shift;
Init
shift = 27 - attr_table.LENGTHPOW;
Control Rate
offset = ___SMMUL(inlet_offset, (attr_table.LENGTH << 5));
// this is NOT an elegant solution
if (inlet_range == (1 << 27) - 1)
max = ___SMMUL(inlet_range, (attr_table.LENGTH << 5)) + offset + 1;
else
max = ___SMMUL(inlet_range, (attr_table.LENGTH << 5)) + offset;
Audio Rate
uint32_t phase =
__USAT((___SMMUL(inlet_phase, inlet_range) << 5) + inlet_offset, 27);
int index = phase >> shift;
int index2;
// this is also not the best I guess.but it works (;
if ((index + 1) < max)
index2 = index + 1;
else
index2 = offset;
int32_t y1 = attr_table.array[index] << attr_table.GAIN;
int32_t y2 = attr_table.array[index2] << attr_table.GAIN;
int frac = (phase - (index << shift)) << (attr_table.LENGTHPOW + 3);
int32_t rr;
rr = ___SMMUL(y1, (1 << 30) - frac);
rr = ___SMMLA(y2, frac, rr);
outlet_out = rr << 2;