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path: root/src/libs/sig/sig.h
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2020-02-10libs/sig: triangle wave; sig_ops_tri / sig_new_tri()Vito Caputo
Added a triangle wave
2020-02-04libs/sig: square wave; sig_ops_sqr / sig_new_sqr()Vito Caputo
This builds minimally upon the existing sine wave code, just use the sign to drive the signal high or low. Wikipedia shows a third state for 0 values, but that's for a -1..+1 signal. I'm producing all 0-1 signals as it's more convenient for this application, but it seems like it would be awkward to return .5f for the 0 case. So 0 is being treated as just another positive value; high.
2020-02-04libs/sig: add sig_new_$op wrappersVito Caputo
Provides improved ergonomics when using the bulitin ops, and much appreciated arity and type checking.
2020-02-03libs/sig: add sig_ref()Vito Caputo
Added some rudimentary refcounting so sig_t's can be readily shared by multiple sig_t's.
2020-02-03libs/sig: add sig_ops_invVito Caputo
map 0-1 inputs to their inverse 1-0
2020-02-03libs/sig: s/sig_ops_inv/sig_ops_neg/gVito Caputo
Rename inv->neg, preparation for a new sig_ops_inv for inverting 0..1 to 1..0
2020-02-03libs/sig: add sig_ops_divVito Caputo
Included a little hack to defend against divide by zero, seems reasonable given the intended use cases.
2020-02-03libs/sig: add sig_ops_{add,sub}Vito Caputo
2020-02-03libs/sig: add sig_ops_expand convenienceVito Caputo
This is a specialized version of sig_ops_scale which assumes a min..max range of -1..+1 nvidia register combiners docs describe this operation as "expand normal", and they have several variants, but I don't want to go too crazy here right now. Plain expand it is.
2020-02-03libs/sig: add sig_ops_scale w/test exampleVito Caputo
This assumes the input value is always 0-1, but may be used to produce values in any signed range, mapped linearly to the input.
2020-02-03libs/sig: add sig_ops_inv for additive inverseVito Caputo
aka negation
2020-02-03libs/sig: add sig_ops_{max,min}Vito Caputo
Supply two sig_t *'s: a, b
2020-02-03libs/sig: add sig_ops_clampVito Caputo
Supply three sig_t *'s: value, min, max
2020-02-03libs/sig: add ops_{abs,ceil,floor,pow,round}Vito Caputo
Added a simple test exercising pow and round
2020-02-03libs/sig: add sig_ops_rand random generatorVito Caputo
(Ab)uses rand_r by feeding ticks_ms as seedp for pseudo-random numbers deterministically derived from ticks_ms.
2020-02-03libs/sig: add sig_ops_lerp linear interpoplationVito Caputo
This takes three signals; a, b, and t t controls the weight interpolating between a and b, they all key off the same time ticks_ms.
2020-02-03libs/sig: intrduce sig_ops_constVito Caputo
The simplest of signals: a constant value. The immediate need for this is to convert ops_sin_ctxt_t.hz to another sig_t enabling varying hz with time, while still being able to have a fixed hz as well.
2020-02-03libs/sig: introduce a signal generator abstractionVito Caputo
This adds a small framework of sorts for creating and composing signal generators. Two generators are implemented at this time; sig_ops_sin and sig_ops_mult sig_ops_sin accepts a hz variable and will produce a sine wave of that frequency. sig_ops_mult accepts two sig_t generators and multiplies their outputs Callers may construct their own sig_ops_t ops structs and supply them to sig_new(), but it's expected that libs/sig will grow a collection of commonly used generators which can then be used by simply passing their sig_ops_$foo to sig_new(). See the test code at the bottom of libs/sig/sig.c for some contrived sample usage. Note by composing multiple sig_ops_sin generators with a sig_ops_mult generator, one can already easily construct a synth-like LFO generator. Some obvious todos are to add triangle/sawtooth/square wave generators. More compositional generators may be interesting as well, like additive and subtractive for example. Those will need to implement clipping, as it's expected that the generators *always* stay within unity (0-1). No modules use this yet, but I expect to wire this up to rtv for driving knobs.
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