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/* sound.c - Sound effect function
* Copyright (c) 1995-1997 Stefan Jokisch
*
* This file is part of Frotz.
*
* Frotz 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.
*
* Frotz 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 "frotz.h"
#ifdef DJGPP
#include "djfrotz.h"
#endif
#define EFFECT_PREPARE 1
#define EFFECT_PLAY 2
#define EFFECT_STOP 3
#define EFFECT_FINISH_WITH 4
extern int direct_call (zword);
static zword routine = 0;
static int next_sample = 0;
static int next_volume = 0;
static bool locked = FALSE;
static bool playing = FALSE;
/*
* init_sound
*
* Initialize sound variables.
*
*/
void init_sound (void)
{
locked = FALSE;
playing = FALSE;
} /* init_sound */
/*
* start_sample
*
* Call the IO interface to play a sample.
*
*/
static void start_sample (int number, int volume, int repeats, zword eos)
{
static zbyte lh_repeats[] = {
0x00, 0x00, 0x00, 0x01, 0xff,
0x00, 0x01, 0x01, 0x01, 0x01,
0xff, 0x01, 0x01, 0xff, 0x00,
0xff, 0xff, 0xff, 0xff, 0xff
};
if (story_id == LURKING_HORROR)
repeats = lh_repeats[number];
os_start_sample (number, volume, repeats, eos);
routine = eos;
playing = TRUE;
}/* start_sample */
/*
* start_next_sample
*
* Play a sample that has been delayed until the previous sound effect has
* finished. This is necessary for two samples in The Lurking Horror that
* immediately follow other samples.
*
*/
static void start_next_sample (void)
{
if (next_sample != 0)
start_sample (next_sample, next_volume, 0, 0);
next_sample = 0;
next_volume = 0;
}/* start_next_sample */
/*
* end_of_sound
*
* Call the Z-code routine which was given as the last parameter of
* a sound_effect call. This function may be called from a hardware
* interrupt (which requires extremely careful programming).
*
*/
void end_of_sound (void)
{
#if defined(DJGPP) && defined(SOUND_SUPPORT)
end_of_sound_flag = 0;
#endif
playing = FALSE;
if (!locked) {
if (story_id == LURKING_HORROR)
start_next_sample ();
direct_call (routine);
}
}/* end_of_sound */
/*
* z_sound_effect, load / play / stop / discard a sound effect.
*
* zargs[0] = number of bleep (1 or 2) or sample
* zargs[1] = operation to perform (samples only)
* zargs[2] = repeats and volume (play sample only)
* zargs[3] = end-of-sound routine (play sample only, optional)
*
* Note: Volumes range from 1 to 8, volume 255 is the default volume.
* Repeats are stored in the high byte, 255 is infinite loop.
*
*/
void z_sound_effect (void)
{
zword number = zargs[0];
zword effect = zargs[1];
zword volume = zargs[2];
/* By default play sound 1 at volume 8 */
if (zargc < 1)
number = 1;
if (zargc < 2)
effect = EFFECT_PLAY;
if (zargc < 3)
volume = 8;
if (number >= 3 || number == 0) {
locked = TRUE;
if (story_id == LURKING_HORROR && (number == 9 || number == 16)) {
if (effect == EFFECT_PLAY) {
next_sample = number;
next_volume = volume;
locked = FALSE;
if (!playing)
start_next_sample ();
} else locked = FALSE;
return;
}
playing = FALSE;
switch (effect) {
case EFFECT_PREPARE:
os_prepare_sample (number);
break;
case EFFECT_PLAY:
start_sample (number, lo (volume), hi (volume), (zargc == 4) ? zargs[3] : 0);
break;
case EFFECT_STOP:
os_stop_sample (number);
break;
case EFFECT_FINISH_WITH:
os_finish_with_sample (number);
break;
}
locked = FALSE;
} else os_beep (number);
}/* z_sound_effect */
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