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/*
* melisma - extensible and scriptable audio engine
* Copyright (C) 2026 Ludvig Gunne Lindström
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <stdbool.h>
#include <stdint.h>
#include <lauxlib.h>
#include "melisma.h"
#define TIMER_TYPENAME "timer"
struct timer
{
bool on;
uint64_t t;
};
static void proc(const ml_proc_args *args)
{
struct timer *tmr = args->userp;
if (tmr->on)
{
tmr->t += args->nframes;
}
}
static int l_init(lua_State *s)
{
struct timer *tmr = calloc(1,sizeof(*tmr));
tmr->on = false;
tmr->t = 0;
ml_node *node = ml_create_node(proc,tmr);
ml_channel *src = ml_add_output(node);
ml_channel *dst = ml_add_input(ml_get_root_node());
ml_connect(src,dst);
*(void**) lua_newuserdata(s,sizeof(void*)) = tmr;
luaL_setmetatable(s,TIMER_TYPENAME);
return 1;
}
static int l_start(lua_State *s)
{
struct timer *tmr = *(void**) luaL_checkudata(s,1,TIMER_TYPENAME);
tmr->on = true;
return 0;
}
static int l_stop(lua_State *s)
{
struct timer *tmr = *(void**) luaL_checkudata(s,1,TIMER_TYPENAME);
tmr->on = false;
return 0;
}
static int l_reset(lua_State *s)
{
struct timer *tmr = *(void**) luaL_checkudata(s,1,TIMER_TYPENAME);
tmr->t = 0;
return 0;
}
static int l_read(lua_State *s)
{
struct timer *tmr = *(void**) luaL_checkudata(s,1,TIMER_TYPENAME);
double t = (double) tmr->t / (double) ml_sample_rate();
lua_pushnumber(s,t);
return 1;
}
int luaopen_melisma_timer(lua_State *s)
{
/*** Time measurement.
local mtimer = require 'melisma.timer'
local mkeycallback = require 'melisma.keycallback'
local timer = mtimer.init()
timer:start()
mkeycallback.set(function()
print(timer:read())
timer:reset()
end)
@classmod timer
*/
lua_newtable(s);
int tbl = lua_gettop(s);
/*** Create a new timer.
@static
@function init
@treturn timer
*/
lua_pushcfunction(s,l_init);
lua_setfield(s,tbl,"init");
/*** Start timer.
@function start
*/
lua_pushcfunction(s,l_start);
lua_setfield(s,tbl,"start");
/*** Stop timer.
@function stop
*/
lua_pushcfunction(s,l_stop);
lua_setfield(s,tbl,"stop");
/*** Reset timer.
@function reset
*/
lua_pushcfunction(s,l_reset);
lua_setfield(s,tbl,"reset");
/*** Read timer.
@function read
@treturn number Elapsed seconds.
*/
lua_pushcfunction(s,l_read);
lua_setfield(s,tbl,"read");
luaL_newmetatable(s,TIMER_TYPENAME);
int mt = lua_gettop(s);
lua_pushvalue(s,tbl);
lua_setfield(s,mt,"__index");
lua_settop(s,tbl);
return 1;
}
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