plugins/libevtpower.c

   1 /* gAlan - Graphical Audio Language
   2  * Copyright (C) 1999 Tony Garnock-Jones
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  */
  18
  19 #include <stdlib.h>
  20 #include <string.h>
  21 #include <stdio.h>
  22 #include <stddef.h>
  23
  24 #include <gdk/gdk.h>
  25 #include <gtk/gtk.h>
  26 #include <gmodule.h>
  27
  28 #include "global.h"
  29 #include "generator.h"
  30 #include "comp.h"
  31 #include "control.h"
  32 #include "gencomp.h"
  33
  34 #define GENERATOR_CLASS_NAME    "evtpower"
  35 #define GENERATOR_CLASS_PATH    "Events/Power"
  36
  37 #define EVT_INPUT               0
  38 #define EVT_ADDEND              1
  39 #define NUM_EVENT_INPUTS        2
  40
  41 #define EVT_OUTPUT              0
  42 #define NUM_EVENT_OUTPUTS       1
  43
  44 typedef struct Data {
  45   gdouble addend;
  46 } Data;
  47
  48 PRIVATE int init_instance(Generator *g) {
  49   Data *data = safe_malloc(sizeof(Data));
  50   g->data = data;
  51
  52   data->addend = 0;
  53
  54   return 1;
  55 }
  56
  57 PRIVATE void destroy_instance(Generator *g) {
  58   free(g->data);
  59 }
  60
  61 PRIVATE void unpickle_instance(Generator *g, ObjectStoreItem *item, ObjectStore *db) {
  62   Data *data = safe_malloc(sizeof(Data));
  63   g->data = data;
  64
  65   data->addend = objectstore_item_get_double(item, "evtpower_addend", 0);
  66 }
  67
  68 PRIVATE void pickle_instance(Generator *g, ObjectStoreItem *item, ObjectStore *db) {
  69   Data *data = g->data;
  70   objectstore_item_set_double(item, "evtpower_addend", data->addend);
  71 }
  72
  73 PRIVATE void evt_input_handler(Generator *g, AEvent *event) {
  74
  75   event->d.number = pow( event->d.number, ((Data *) g->data)->addend ) ;
  76   gen_send_events(g, EVT_OUTPUT, -1, event);
  77 }
  78
  79 PRIVATE void evt_addend_handler(Generator *g, AEvent *event) {
  80   ((Data *) g->data)->addend = event->d.number;
  81 }
  82
  83 PRIVATE ControlDescriptor controls[] = {
  84   /* { kind, name, min,max,step,page, size,editable, is_dst,queue_number,
  85        init,destroy,refresh,refresh_data }, */
  86   { CONTROL_KIND_KNOB, "power", -1,1,0.1,0.01, 0,TRUE, TRUE,EVT_ADDEND,
  87     NULL,NULL, control_double_updater, (gpointer) offsetof(Data, addend) },
  88   { CONTROL_KIND_NONE, }
  89 };
  90
  91 PRIVATE void setup_class(void) {
  92   GeneratorClass *k = gen_new_generatorclass(GENERATOR_CLASS_NAME, FALSE,
  93                                              NUM_EVENT_INPUTS, NUM_EVENT_OUTPUTS,
  94                                              NULL, NULL, controls,
  95                                              init_instance, destroy_instance,
  96                                              unpickle_instance, pickle_instance);
  97
  98   gen_configure_event_input(k, EVT_INPUT, "Input", evt_input_handler);
  99   gen_configure_event_input(k, EVT_ADDEND, "Power", evt_addend_handler);
 100   gen_configure_event_output(k, EVT_OUTPUT, "Output");
 101
 102   gencomp_register_generatorclass(k, FALSE, GENERATOR_CLASS_PATH,
 103                                   NULL,
 104                                   NULL);
 105 }
 106
 107 PUBLIC void init_plugin(void) {
 108   setup_class();
 109 }