Dear Oleg, James, Dario, all,
`control` looks promising, however, it is not as straight-forward as I thought:
```
import("stdfaust.lib");
// a sinewave
sineFloatFreq = os.oscp(1000.0, 0);
// an impulse with variable frequency and leading trigger
trigger = impulse(1000) with {
impulse(freq) = 1-1', (lfsaw_uni(freq, 0) : strictFalling) :> _;
strictFalling(x) = x < x';
lfsaw_uni(freq, phase) = inc(freq) + phaseChange(phase : ma.frac) : + ~
ma.frac with {
phaseChange(phase) = phase - phase';
inc(freq) = freq/float(ma.SR);
};
};
process = trigger <: _, _, _, _ :
_, // trigger
sineFloatFreq, // sine wave, try to toggle-comment this
line
// 0, // with this line to see how it affects
// computational behaviour
control(sineFloatFreq, _), // outer sine wave
control(innerSine, _), // inner sine wave (integer frequency)
control(innerSineFloatFreq, _) // inner sine wave (same definition as
outer sine wave)
with {
innerSine = os.oscp(1000, 0);
innerSineFloatFreq = os.oscp(1000.0, 0);
};
```
if you run this e.g. in the faustide[1], you'll see that `sineFloatFreq` and
`innerSineFloatFreq ` reduce to the same code, while `innerSine`, which has a
slightly different definition (`freq` is `(int) 1000` instead of
`float(1000.0)`) behaves as I'd expect.
Note that, although definitions are equivalent, output of all is different
This means that a recursive definition with latch is still needed.
I'll investigate further.
all the best
Till
[1] (I turned off autorun but it seems to have no effect...)
https://faustide.grame.fr/?autorun=0&voices=0&name=controlDemand&inline=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
--
Till Bovermann
https://tai-studio.org | http://lfsaw.de | https://www.instagram.com/_lfsaw/
> On 14. Jul 2020, at 14:42, Oleg Nesterov <[email protected]> wrote:
>
> On 07/14, Till Bovermann wrote:
>>
>> Thanks also to you, Oleg; is there somewhere an example for the control
>> primitive,
>
> Sorry, I do not know. But see below.
>
> However, I did "git pull" and it seems that "control/enable" are already
> supported in FIR scalar mode. Probably the commit 32846af52e92498? Cool.
>
> Say,
>
> process = control(sin, _);
>
> compiles to
>
> virtual void compute(int count, FAUSTFLOAT** inputs, FAUSTFLOAT**
> outputs) {
> FAUSTFLOAT* input0 = inputs[0];
> FAUSTFLOAT* input1 = inputs[1];
> FAUSTFLOAT* output0 = outputs[0];
> float fTemp0 = fTempPerm0;
> for (int i = 0; (i < count); i = (i + 1)) {
> if (float(input1[i]) != 0.0f) {
> fTemp0 = std::sin(float(input0[i]));
> }
> output0[i] = FAUSTFLOAT(fTemp0);
> }
> fTempPerm0 = fTemp0;
> }
>
> note that sin(input0[i]) is only evaluated if input1[i] != 0.
>
> Oleg.
>
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