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-rw-r--r--apps/plugins/frotz/sound.c204
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diff --git a/apps/plugins/frotz/sound.c b/apps/plugins/frotz/sound.c
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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 */