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	TNF:1.1.1;
locks; strict;
comment	@# @;


1.2
date	2004.05.28.11.09.44;	author dillo;	state dead;
branches;
next	1.1;

1.1
date	2004.05.14.15.42.15;	author dillo;	state Exp;
branches
	1.1.1.1;
next	;

1.1.1.1
date	2004.05.14.15.42.15;	author dillo;	state Exp;
branches;
next	;


desc
@@


1.2
log
@raw has been discontinued by its author, distfile no longer available
@
text
@$NetBSD: patch-af,v 1.1 2004/05/14 15:42:15 dillo Exp $

This includes sound-20040508.diff from the master site.

--- mixer.cpp.orig	Sun May  9 21:04:46 2004
+++ mixer.cpp
@@@@ -0,0 +1,117 @@@@
+/* Raw - Another World Interpreter
+ * Copyright (C) 2004 Gregory Montoir
+ *
+ * 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 "mixer.h"
+#include "systemstub.h"
+
+
+static int8 addclamp(int a, int b) {
+	int add = a + b;
+	if (add < -128) {
+		add = -128;
+	}
+	else if (add > 127) {
+		add = 127;
+	}
+	return (int8)add;
+}
+
+Mixer::Mixer(SystemStub *stub) 
+	: _stub(stub) {
+}
+
+void Mixer::init() {
+	memset(_channels, 0, sizeof(_channels));
+	_stub->startAudio(Mixer::mixCallback, this);
+}
+
+void Mixer::free() {
+	_stub->stopAudio();
+}
+
+void Mixer::playChannel(uint8 channel, const MixerChunk *mc, uint16 freq, uint8 volume) {
+	debug(DBG_SND, "Mixer::playChannel(%d, %d, %d)", channel, freq, volume);
+	assert(channel < NUM_CHANNELS);
+	_stub->lockAudio();
+	MixerChannel *ch = &_channels[channel];
+	ch->active = true;
+	ch->volume = volume;
+	ch->chunk = *mc;
+	ch->chunkPos = 0;
+	ch->chunkInc = (freq << 8) / _stub->getOutputSampleRate();
+	_stub->unlockAudio();
+}
+
+void Mixer::stopChannel(uint8 channel) {
+	debug(DBG_SND, "Mixer::stopChannel(%d)", channel);
+	assert(channel < NUM_CHANNELS);
+	_stub->lockAudio();
+	_channels[channel].active = false;
+	_stub->unlockAudio();
+}
+
+void Mixer::stopAll() {
+	debug(DBG_SND, "Mixer::stopAll()");
+	_stub->lockAudio();
+	for (uint8 i = 0; i < NUM_CHANNELS; ++i) {
+		_channels[i].active = false;		
+	}
+	_stub->unlockAudio();
+}
+
+void Mixer::mix(int8 *buf, int len) {
+	memset(buf, 0, len);
+	for (uint8 i = 0; i < NUM_CHANNELS; ++i) {
+		MixerChannel *ch = &_channels[i];
+		if (ch->active) {
+			int8 *pBuf = buf;
+			for (int j = 0; j < len; ++j, ++pBuf) {
+				uint16 p1, p2;
+				uint16 ilc = (ch->chunkPos & 0xFF);
+				p1 = ch->chunkPos >> 8;
+				ch->chunkPos += ch->chunkInc;
+				if (ch->chunk.loopLen != 0) {
+					if (p1 == ch->chunk.loopPos + ch->chunk.loopLen - 1) {
+						debug(DBG_SND, "Looping sample on channel %d", i);
+						ch->chunkPos = p2 = ch->chunk.loopPos;
+					} else {
+						p2 = p1 + 1;
+					}
+				} else {
+					if (p1 == ch->chunk.len - 1) {
+						debug(DBG_SND, "Stopping sample on channel %d", i);
+						ch->active = false;
+						break;
+					} else {
+						p2 = p1 + 1;
+					}
+				}
+				// interpolate
+				int8 b1 = *(int8 *)(ch->chunk.data + p1);
+				int8 b2 = *(int8 *)(ch->chunk.data + p2);
+				int8 b = (int8)((b1 * (0xFF - ilc) + b2 * ilc) >> 8);
+				// set volume and clamp
+				*pBuf = addclamp(*pBuf, (int)b * ch->volume / 0x40);
+			}
+		}
+	}
+}
+
+void Mixer::mixCallback(void *param, uint8 *buf, int len) {
+	((Mixer *)param)->mix((int8 *)buf, len);
+}
@


1.1
log
@Initial revision
@
text
@d1 1
a1 1
$NetBSD$
@


1.1.1.1
log
@initial import of raw 0.1.0:

raw is a rewrite of the engine used in the action/adventure game
Another World/Out of this World released for DOS and Amiga. This
program is designed as a cross-platform replacement for the original
executable and uses the SDL library.  You will need the data files
from the DOS version of the game to play.
@
text
@@