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/* gAlan - Graphical Audio Language
* Copyright (C) 1999 Tony Garnock-Jones
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <stddef.h>
#include <gdk/gdk.h>
#include <gtk/gtk.h>
#include "global.h"
#include "generator.h"
#include "comp.h"
#include "control.h"
#include "gencomp.h"
#define GENERATOR_CLASS_NAME "clock"
#define GENERATOR_CLASS_PATH "Misc/Clock"
enum EVT_INPUTS {
EVT_FREQ = 0,
EVT_RESET,
EVT_TRIGGER,
NUM_EVT_INPUTS
};
enum EVT_OUTPUTS {
EVT_CLOCK = 0,
NUM_EVT_OUTPUTS
};
typedef struct Data {
gdouble freq;
gint period;
gint lasttrigger;
} Data;
PRIVATE gboolean init_instance(Generator *g) {
Data *data = safe_malloc(sizeof(Data));
g->data = data;
data->period = 0;
data->lasttrigger = 0;
return TRUE;
}
PRIVATE void destroy_instance(Generator *g) {
free(g->data);
}
PRIVATE void unpickle_instance(Generator *g, ObjectStoreItem *item, ObjectStore *db) {
Data *data = safe_malloc(sizeof(Data));
g->data = data;
data->period = objectstore_item_get_integer(item, "clock_period", 0);
data->lasttrigger = gen_get_sampletime();
if (data->period != 0) {
AEvent event;
data->freq = (gdouble) SAMPLE_RATE / data->period;
gen_init_aevent(&event, AE_NUMBER, NULL, 0, g, EVT_TRIGGER, gen_get_sampletime());
gen_post_aevent(&event);
}
}
PRIVATE void pickle_instance(Generator *g, ObjectStoreItem *item, ObjectStore *db) {
Data *data = g->data;
objectstore_item_set_integer(item, "clock_period", data->period);
}
PRIVATE void evt_freq_handler(Generator *g, AEvent *event) {
Data *data = g->data;
data->freq = event->d.number;
gen_purge_inputevent_queue_refs(g);
if (event->d.number < 0.0001)
data->period = 0;
else
data->period = SAMPLE_RATE / event->d.number;
if (data->period != 0) {
if( (event->time - data->lasttrigger) > data->period )
gen_init_aevent(event, AE_NUMBER, NULL, 0, g, EVT_TRIGGER, event->time);
else
gen_init_aevent(event, AE_NUMBER, NULL, 0, g, EVT_TRIGGER, data->lasttrigger + data->period);
gen_post_aevent(event);
}
}
PRIVATE void evt_trigger_handler(Generator *g, AEvent *event) {
Data *data = g->data;
if (data->period != 0) {
data->lasttrigger = event->time;
gen_init_aevent(event, AE_NUMBER, NULL, 0, g, EVT_TRIGGER, event->time + data->period);
gen_post_aevent(event);
}
gen_init_aevent(event, AE_NUMBER, NULL, 0, NULL, 0, event->time);
event->d.number = 0;
gen_send_events(g, EVT_CLOCK, -1, event);
}
PRIVATE void evt_reset_handler(Generator *g, AEvent *event) {
Data *data = g->data;
gen_purge_inputevent_queue_refs(g);
if (data->period != 0) {
gen_init_aevent(event, AE_NUMBER, NULL, 0, g, EVT_TRIGGER, event->time );
gen_post_aevent(event);
}
// gen_init_aevent(event, AE_NUMBER, NULL, 0, NULL, 0, event->time);
// event->d.number = 0;
// gen_send_events(g, EVT_CLOCK, -1, event);
}
PRIVATE ControlDescriptor controls[] = {
{ CONTROL_KIND_KNOB, "rate", 0,500,1,1, 0,TRUE, TRUE,EVT_FREQ,
NULL,NULL, control_double_updater, (gpointer) offsetof(Data, freq) },
{ CONTROL_KIND_NONE, }
};
PRIVATE void setup_class(void) {
GeneratorClass *k = gen_new_generatorclass(GENERATOR_CLASS_NAME, FALSE,
NUM_EVT_INPUTS, NUM_EVT_OUTPUTS,
NULL, NULL, controls,
init_instance, destroy_instance,
unpickle_instance, pickle_instance);
gen_configure_event_input(k, EVT_FREQ, "Freq", evt_freq_handler);
gen_configure_event_input(k, EVT_RESET, "Reset", evt_reset_handler);
gen_configure_event_input(k, EVT_TRIGGER, "Trigger", evt_trigger_handler);
gen_configure_event_output(k, EVT_CLOCK, "Clock");
gencomp_register_generatorclass(k, FALSE, GENERATOR_CLASS_PATH, NULL, NULL);
}
PUBLIC void init_plugin_clock(void) {
setup_class();
}
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