rototiller/.git - Collection of software-rendered graphics hacks supporting libdrm and SDL2

Age	Commit message (Collapse)	Author
2020-02-10	libs/sig: triangle wave; sig_ops_tri / sig_new_tri()	Vito Caputo
	Added a triangle wave
2020-02-04	libs/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.
2020-02-04	libs/sig: add sig_new_$op wrappers	Vito Caputo
	Provides improved ergonomics when using the bulitin ops, and much appreciated arity and type checking.
2020-02-03	libs/sig: add sig_ref()	Vito Caputo
	Added some rudimentary refcounting so sig_t's can be readily shared by multiple sig_t's.
2020-02-03	libs/sig: add sig_ops_scale w/test example	Vito Caputo
	This assumes the input value is always 0-1, but may be used to produce values in any signed range, mapped linearly to the input.
2020-02-03	libs/sig: add ops_{abs,ceil,floor,pow,round}	Vito Caputo
	Added a simple test exercising pow and round
2020-02-03	libs/sig: consideration for sig_t.ctxt alignment	Vito Caputo
	The flexible array of void *'s would just align to a pointer, which may not be safe for all members of whatever gets shoved in here. In an effort to make it more robust, make it an array of a junk drawer union of types.
2020-02-03	libs/sig: add sig_ops_rand random generator	Vito Caputo
	(Ab)uses rand_r by feeding ticks_ms as seedp for pseudo-random numbers deterministically derived from ticks_ms.
2020-02-03	libs/sig: convert ops_sin_ctxt_t.hz to a sig_t *	Vito Caputo
	Now hz can vary with time as well...
2020-02-03	libs/sig: introduce a signal generator abstraction	Vito Caputo
	This adds a small framework of sorts for creating and composing signal generators. Two generators are implemented at this time; sig_ops_sin and sig_ops_mult sig_ops_sin accepts a hz variable and will produce a sine wave of that frequency. sig_ops_mult accepts two sig_t generators and multiplies their outputs Callers may construct their own sig_ops_t ops structs and supply them to sig_new(), but it's expected that libs/sig will grow a collection of commonly used generators which can then be used by simply passing their sig_ops_$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.