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Add Lua bindings for libtemporal type operations

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This allows to use standard arithmetic (+ - * / %) and
relational (< <= ==) operations on Temporal::timepos_t
and Temporal::timecnt_t class instances.

Furthermore `print()` outputs the actual value (no longer
user-data pointer to the instance).
This commit is contained in:
Robin Gareus 2022-01-24 06:21:12 +01:00
parent d51a1ccd99
commit 90ff5de6e3
Signed by: rgareus
GPG Key ID: A090BCE02CF57F04
1 changed files with 69 additions and 3 deletions
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72
libs/ardour/luabindings.cc
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@ -101,6 +101,22 @@
#include "LuaBridge/LuaBridge.h"
/* lambda function to use for Lua metatable methods.
* A generic C++ template won't work here because
* operators cannot be used as template parameters.
*/
#define CPPOPERATOR2(RTYPE, TYPE1, TYPE2, OP) \
[] (lua_State* L) { \
TYPE1* const t0 = luabridge::Userdata::get <TYPE1> (L, 1, false); \
TYPE2* const t1 = luabridge::Userdata::get <TYPE2> (L, 2, false); \
luabridge::Stack <RTYPE>::push (L, (*t0 OP *t1)); \
return 1; \
}
#define CPPCOMPERATOR(TYPE, OP) CPPOPERATOR2 (bool, TYPE, TYPE, OP)
#define CPPOPERATOR(TYPE, OP) CPPOPERATOR2 (TYPE, TYPE, TYPE, OP)
#ifdef PLATFORM_WINDOWS
/* luabridge uses addresses of static functions/variables to identify classes.
*
@ -548,6 +564,12 @@ LuaBindings::common (lua_State* L)
.addConst ("superclock_ticks_per_second", Temporal::superclock_ticks_per_second)
.addConst ("ticks_per_beat", Temporal::ticks_per_beat)
.beginClass <Temporal::ratio_t> ("ratio")
.addConstructor <void (*) (int64_t, int64_t)> ()
.addFunction ("is_unity", &Temporal::ratio_t::is_unity)
.addFunction ("is_zero", &Temporal::ratio_t::is_zero)
.endClass ()
.beginClass <Temporal::Beats> ("Beats")
.addConstructor <void (*) (int32_t, int32_t)> ()
.addStaticFunction ("from_double", &Temporal::Beats::from_double)
@ -560,17 +582,61 @@ LuaBindings::common (lua_State* L)
// add wrappers to construct timepos_t from samples
.beginClass <Temporal::timepos_t> ("timepos_t")
.addVoidConstructor ()
.addConstructor <void (*) (Temporal::samplepos_t)> ()
.addOperator ("__add", CPPOPERATOR(Temporal::timepos_t, +))
.addOperator ("__mod", CPPOPERATOR2(Temporal::timepos_t, Temporal::timepos_t, Temporal::timecnt_t, %))
.addOperator ("__mul", CPPOPERATOR2(Temporal::timepos_t, Temporal::timepos_t, Temporal::ratio_t , *))
.addOperator ("__div", CPPOPERATOR2(Temporal::timepos_t, Temporal::timepos_t, Temporal::ratio_t , /))
.addOperator ("__lt", CPPCOMPERATOR(Temporal::timepos_t, <))
.addOperator ("__le", CPPCOMPERATOR(Temporal::timepos_t, <=))
.addOperator ("__eq", CPPCOMPERATOR(Temporal::timepos_t, ==))
.addStaticFunction ("zero", &Temporal::timepos_t::zero)
.addStaticFunction ("from_superclock", &Temporal::timepos_t::from_superclock)
.addStaticFunction ("from_ticks", &Temporal::timepos_t::from_ticks)
.addFunction ("is_positive", &Temporal::timepos_t::is_positive)
.addFunction ("is_negative", &Temporal::timepos_t::is_negative)
.addFunction ("is_zero", &Temporal::timepos_t::is_zero)
.addFunction ("is_beats", &Temporal::timepos_t::is_beats)
.addFunction ("is_superclock", &Temporal::timepos_t::is_superclock)
.addFunction ("superclocks", &Temporal::timepos_t::superclocks)
.addFunction ("samples", &Temporal::timepos_t::samples)
.addFunction ("ticks", &Temporal::timepos_t::ticks)
.addFunction ("beats", &Temporal::timepos_t::beats)
.addFunction ("str", &Temporal::timepos_t::str)
.addMetamethod ("__tostring", &Temporal::timepos_t::str)
.endClass ()
.beginClass <timecnt_t> ("timecnt_t")
.addVoidConstructor ()
.addStaticFunction ("zero", &timecnt_t::zero)
.addConstructor <void (*) (Temporal::samplepos_t)> ()
.addOperator ("__add", CPPOPERATOR(Temporal::timecnt_t, +))
.addOperator ("__sub", CPPOPERATOR(Temporal::timecnt_t, -))
.addOperator ("__mul", CPPOPERATOR2(Temporal::timecnt_t, Temporal::timecnt_t, Temporal::ratio_t , *))
.addOperator ("__div", CPPOPERATOR2(Temporal::timecnt_t, Temporal::timecnt_t, Temporal::ratio_t , /))
.addOperator ("__lt", CPPCOMPERATOR(Temporal::timecnt_t, <))
.addOperator ("__le", CPPCOMPERATOR(Temporal::timecnt_t, <=))
.addOperator ("__eq", CPPCOMPERATOR(Temporal::timecnt_t, ==))
#if 0 // TODO these methods are, despite the static_cast<>, ambiguous
.addStaticFunction ("zero", &Temporal::timecnt_t::zero)
.addStaticFunction ("from_superclock", static_cast<Temporal::timecnt_t(Temporal::timecnt_t::*)(Temporal::superclock_t)>(&Temporal::timecnt_t::from_superclock))
.addStaticFunction ("from_samples", static_cast<Temporal::timecnt_t(Temporal::timecnt_t::*)(Temporal::samplepos_t)>(&Temporal::timecnt_t::from_samples))
.addStaticFunction ("from_ticks", static_cast<Temporal::timecnt_t(Temporal::timecnt_t::*)(int64_t)>(&Temporal::timecnt_t::from_ticks))
#endif
.addFunction ("magnitude", &Temporal::timecnt_t::magnitude)
.addFunction ("position", &Temporal::timecnt_t::position)
.addFunction ("origin", &Temporal::timecnt_t::origin)
.addFunction ("set_position", &Temporal::timecnt_t::set_position)
.addFunction ("is_positive", &Temporal::timecnt_t::is_positive)
.addFunction ("is_negative", &Temporal::timecnt_t::is_negative)
.addFunction ("is_zero", &Temporal::timecnt_t::is_zero)
.addFunction ("abs", &Temporal::timecnt_t::abs)
.addFunction ("time_domain", &Temporal::timecnt_t::time_domain)
.addFunction ("set_time_domain", &Temporal::timecnt_t::set_time_domain)
.addFunction ("superclocks", &Temporal::timecnt_t::superclocks)
.addFunction ("samples", &Temporal::timecnt_t::samples)
.addFunction ("beats", &Temporal::timecnt_t::beats)
.addFunction ("ticks", &Temporal::timecnt_t::ticks)
.addFunction ("str", &Temporal::timecnt_t::str)
.addMetamethod ("__tostring", &Temporal::timecnt_t::str)
.endClass ()
.beginClass <Temporal::BBT_Time> ("BBT_TIME")