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engines/ultima/nuvie/sound/adplug/emu_opl.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 "ultima/nuvie/sound/adplug/emu_opl.h"
+#include "ultima/nuvie/sound/adplug/fm_opl.h"
+
+namespace Ultima {
+namespace Nuvie {
+
+CEmuopl::CEmuopl(int rate, bool bit16, bool usestereo)
+	: use16bit(bit16), stereo(usestereo), oplRate(rate) {
+	YM3812Init(1, 3579545, rate);
+}
+
+CEmuopl::~CEmuopl() {
+	YM3812Shutdown();
+}
+
+void CEmuopl::update(short *buf, int samples) {
+	int i;
+
+	if (use16bit) {
+		YM3812UpdateOne(0, buf, samples);
+
+		if (stereo)
+			for (i = samples - 1; i >= 0; i--) {
+				buf[i * 2] = buf[i];
+				buf[i * 2 + 1] = buf[i];
+			}
+	} else {
+		short *tempbuf = new short[stereo ? samples * 2 : samples];
+
+		YM3812UpdateOne(0, tempbuf, samples);
+
+		if (stereo)
+			for (i = samples - 1; i >= 0; i--) {
+				tempbuf[i * 2] = tempbuf[i];
+				tempbuf[i * 2 + 1] = tempbuf[i];
+			}
+
+		for (i = 0; i < (stereo ? samples * 2 : samples); i++)
+			((char *)buf)[i] = (tempbuf[i] >> 8) ^ 0x80;
+
+		delete [] tempbuf;
+	}
+}
+
+void CEmuopl::write(int reg, int val) {
+	YM3812Write(0, 0, reg);
+	YM3812Write(0, 1, val);
+}
+
+void CEmuopl::init() {
+	YM3812ResetChip(0);
+}
+
+} // End of namespace Nuvie
+} // End of namespace Ultima