Merge pull request #532 from Marisa-Chan/zvision

ZVISION: More complete engine implementation

1 files changed, 89 insertions, 0 deletions

diff --git a/engines/zvision/core/midi.cpp b/engines/zvision/core/midi.cpp
new file mode 100644
index 0000000000..736be1311d
--- /dev/null
+++ b/engines/zvision/core/midi.cpp
@@ -0,0 +1,89 @@
+/* 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 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#include "common/scummsys.h"
+
+#include "zvision/core/midi.h"
+
+namespace ZVision {
+
+MidiManager::MidiManager() {
+	MidiDriver::DeviceHandle dev = MidiDriver::detectDevice(MDT_MIDI | MDT_ADLIB);
+	_driver = MidiDriver::createMidi(dev);
+	_driver->open();
+}
+
+MidiManager::~MidiManager() {
+	stop();
+	_driver->close();
+	delete _driver;
+}
+
+void MidiManager::stop() {
+	for (int8 i = 0; i < 16; i++)
+		if (_playChannels[i].playing)
+			noteOff(i);
+}
+
+void MidiManager::noteOn(int8 channel, int8 note, int8 velocity) {
+	assert(channel <= 15);
+
+	_playChannels[channel].playing = true;
+	_playChannels[channel].note = note;
+	_driver->send(channel | (velocity << 16) | (note << 8) | 0x90);
+}
+
+void MidiManager::noteOff(int8 channel) {
+	assert(channel <= 15);
+
+	if (_playChannels[channel].playing) {
+		_playChannels[channel].playing = false;
+		_driver->send(channel | (_playChannels[channel].note << 8) | 0x80);
+	}
+}
+
+int8 MidiManager::getFreeChannel() {
+	for (int8 i = 0; i < 16; i++)
+		if (!_playChannels[i].playing)
+			return i;
+	return -1;
+}
+
+void MidiManager::setPan(int8 channel, int8 pan) {
+	assert(channel <= 15);
+
+	_driver->send(channel | (pan << 16) | 0xAB0);
+}
+
+void MidiManager::setVolume(int8 channel, int8 volume) {
+	assert(channel <= 15);
+
+	_driver->send(channel | (volume << 16) | 0x7B0);
+}
+
+void MidiManager::setProgram(int8 channel, int8 prog) {
+	assert(channel <= 15);
+
+	_driver->send(channel | (prog << 8) | 0xC0);
+}
+
+} // End of namespace ZVision