ss_gen.h

   1 /*
   2
   3     Ann Hell Ex Machina - Music Software
   4     Copyright (C) 2003/2004 Angel Ortega <angel@triptico.com>
   5
   6     This program is free software; you can redistribute it and/or
   7     modify it under the terms of the GNU General Public License
   8     as published by the Free Software Foundation; either version 2
   9     of the License, or (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  19
  20     http://www.triptico.com
  21
  22 */
  23
  24 #ifndef SS_GEN_NUM
  25 #define SS_GEN_NUM      256
  26 #endif
  27
  28 #define SS_GEN_PLAYING  3
  29 #define SS_GEN_RELEASED 2
  30 #define SS_GEN_FREE     0
  31
  32 struct ss_gen
  33 {
  34         int mode;               /* SS_GEN_* */
  35
  36         int note_id;            /* note ID */
  37
  38         struct ss_wave w;       /* the wave data */
  39         float vol[CHANNELS];    /* the volumes */
  40
  41         double cursor;          /* offset to next sample */
  42         double inc;             /* increment (frequency) */
  43
  44         int sustain;            /* number of samples to play after release */
  45         float dvol[CHANNELS];   /* volume decrement for each sample in sustain */
  46
  47         double portamento;      /* portamento sum to inc */
  48
  49         double vibrato;
  50         double vib_depth;
  51         double vib_inc;
  52
  53         struct ss_gen * next;
  54         struct ss_gen * prev;
  55 };
  56
  57 extern struct ss_gen * _ss_gen_free;
  58
  59 void ss_gen_enqueue(struct ss_gen ** q, struct ss_gen * g);
  60 void ss_gen_dequeue(struct ss_gen ** q, struct ss_gen * g);
  61 struct ss_gen * _ss_gen_get_free(void);
  62
  63 int ss_gen_play(struct ss_gen * g, int note_id, double freq, float vol[],
  64         struct ss_wave * w);
  65
  66 int ss_gen_release(struct ss_gen * g);
  67
  68 int ss_gen_frame(struct ss_gen * g, float frame[]);
  69
  70 int ss_gen_portamento(struct ss_gen * g, int portamento, double dest_inc);