Initial commit

engines/chamber/sound.cpp

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "audio/mixer.h"
+#include "audio/softsynth/pcspk.h"
+
+#include "chamber/chamber.h"
+#include "chamber/common.h"
+#include "chamber/sound.h"
+#include "chamber/ifgm.h"
+
+namespace Chamber {
+
+typedef struct pcsample_t {
+	unsigned short repeat;
+	unsigned short delay1;
+	unsigned short delay1sweep;
+	unsigned short delay2;
+	unsigned short delay2sweep;
+	unsigned short freq;
+	unsigned short freqsweep;
+} pcsample_t;
+
+#define N(x) (0xF000|x)
+
+pcsample_t pc_samples[] = {
+	{ 64,   32,      0,   32,      0,    256,      0},
+	{  1, 2560,      0, 2560,      0,      0,      0},
+	{  8, 2048,      0,  256,    256,      0,      0},
+	{ 11, 2816, N(256), 2816, N(256),    256,    256},
+	{  1,  768,      0,  768,      0,    256,      0},
+	{128,   48,      1,   48,      0, 61440u,      1},
+	{128,   80,      1,   80,      0,      1,      1},
+	{128,  128,      1,  128,      1,     16,      1},
+	{128,  128,      1,  128,      0,    256,     16},
+	{128,  128,      1,  128,      1, 61440u,  N(16)},
+	{ 16, 1536,      0, 1536,      0,      0,      0},
+	{  3,  768,      0,  768, N(256),    256, N(256)},
+};
+
+#undef N
+
+static void speakerPlay(pcsample_t *sample) {
+	uint16 rep, freq, delay1, delay2;
+
+	freq = sample->freq;
+	delay1 = sample->delay1;
+	delay2 = sample->delay2;
+
+	for (rep = 0; rep < sample->repeat; rep++) {
+		uint32 frequency = 1193180 / (freq ? freq : 1);
+		uint32 delayOff = delay1 * 16; // Around 335 ticks per second
+		uint32 delayOn = delay2 * 16;
+
+		g_vm->_speaker->playQueue(Audio::PCSpeaker::kWaveFormSilence, frequency, delayOff);
+		g_vm->_speaker->playQueue(Audio::PCSpeaker::kWaveFormSquare, frequency, delayOn);
+
+		if (sample->delay1sweep & 0xF000)
+			delay1 -= sample->delay1sweep & 0xFFF;
+		else
+			delay1 += sample->delay1sweep;
+
+		if (sample->delay2sweep & 0xF000)
+			delay2 -= sample->delay2sweep & 0xFFF;
+		else
+			delay2 += sample->delay2sweep;
+
+		if (sample->freqsweep & 0xF000)
+			freq -= sample->freqsweep & 0xFFF;
+		else
+			freq += sample->freqsweep;
+	}
+}
+
+#define kMaxSounds 12
+
+byte sounds_table[kMaxSounds][3] = {
+	{20, 0, 0},
+	{19, 0, 0},
+	{176, 0, 0},
+	{144, 145, 146},
+	{243, 0, 0},
+	{18, 0, 0},
+	{149, 21, 0},
+	{27, 0, 0},
+	{241, 25, 151},
+	{22, 0, 0},
+	{224, 0, 0},
+	{31, 0, 0}
+};
+
+void playSound(byte index) {
+	int16 i;
+	if (IFGM_PlaySound(index))
+		return;
+
+	for (i = 0; i < kMaxSounds; i++) {
+		if (sounds_table[i][0] == index
+		        || sounds_table[i][1] == index
+		        || sounds_table[i][2] == index) {
+			speakerPlay(&pc_samples[i]);
+			break;
+		}
+	}
+}
+
+void ChamberEngine::initSound() {
+	// Setup mixer
+	syncSoundSettings();
+
+	_speaker = new Audio::PCSpeaker();
+	_speaker->init();
+}
+
+void ChamberEngine::deinitSound() {
+	delete g_vm->_speaker;
+}
+
+} // End of namespace Chamber