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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/>.
*
*/
// Disable symbol overrides so that we can use system headers.
#define FORBIDDEN_SYMBOL_ALLOW_ALL
#include "common/scummsys.h"
#ifdef RISCOS
#include "common/error.h"
#include "common/textconsole.h"
#include "audio/musicplugin.h"
#include "audio/mpu401.h"
#include <kernel.h>
#include <swis.h>
#ifndef MIDI_TxByte
#define MIDI_TxByte 0x404C9
#endif
#ifndef MIDI_TxCommand
#define MIDI_TxCommand 0x404CA
#endif
class MidiDriver_RISCOS final : public MidiDriver_MPU401 {
public:
MidiDriver_RISCOS(int port = 0) : _isOpen(false), _port(port) {}
~MidiDriver_RISCOS() {}
int open() override;
bool isOpen() const override { return _isOpen; }
void close() override;
void send(uint32 b) override;
void sysEx(const byte *msg, uint16 length) override;
private:
_kernel_oserror *txByte(int r0);
_kernel_oserror *txCommand(int r0, int r1);
bool _isOpen;
int _port;
};
int MidiDriver_RISCOS::open() {
if (isOpen())
return MERR_ALREADY_OPEN;
_isOpen = true;
return 0;
}
void MidiDriver_RISCOS::close() {
MidiDriver_MPU401::close();
_isOpen = false;
}
void MidiDriver_RISCOS::send(uint32 b) {
assert(isOpen());
midiDriverCommonSend(b);
// Extract the MIDI data
byte status_byte = (b & 0x000000FF);
// byte first_byte = (b & 0x0000FF00) >> 8;
// byte second_byte = (b & 0x00FF0000) >> 16;
// Compute the correct length of the MIDI command. This is important,
// else things may screw up badly...
byte length;
switch (status_byte & 0xF0) {
case 0x80: // Note Off
case 0x90: // Note On
case 0xA0: // Polyphonic Aftertouch
case 0xB0: // Controller Change
case 0xE0: // Pitch Bending
length = 3;
break;
case 0xC0: // Programm Change
case 0xD0: // Monophonic Aftertouch
length = 2;
break;
default:
warning("RISC OS driver encountered unsupported status byte: 0x%02x", status_byte);
length = 3;
break;
}
// Finally send it out to the synthesizer.
txCommand(b | (length << 24) | (_port << 28), 0);
}
void MidiDriver_RISCOS::sysEx(const byte *msg, uint16 length) {
assert(isOpen());
int port = (_port << 28);
txByte(0xF0 | port);
for (; length; --length, ++msg) {
txByte(*msg | port);
}
txByte(0xF7 | port);
}
_kernel_oserror *MidiDriver_RISCOS::txByte(int r0) {
_kernel_swi_regs regs;
regs.r[0] = r0;
return _kernel_swi(MIDI_TxByte, ®s, ®s);
}
_kernel_oserror *MidiDriver_RISCOS::txCommand(int r0, int r1) {
_kernel_swi_regs regs;
regs.r[0] = r0;
regs.r[1] = r1;
return _kernel_swi(MIDI_TxCommand, ®s, ®s);
}
// Plugin interface
class RISCOSMusicPlugin : public MusicPluginObject {
public:
const char *getName() const {
return "RISC OS MIDI";
}
const char *getId() const {
return "riscos";
}
MusicDevices getDevices() const;
Common::Error createInstance(MidiDriver **mididriver, MidiDriver::DeviceHandle = 0) const;
};
MusicDevices RISCOSMusicPlugin::getDevices() const {
MusicDevices devices;
// TODO: Return a different music type depending on the configuration
// TODO: List the available devices
devices.push_back(MusicDevice(this, "", MT_GM));
return devices;
}
Common::Error RISCOSMusicPlugin::createInstance(MidiDriver **mididriver, MidiDriver::DeviceHandle device) const {
*mididriver = new MidiDriver_RISCOS();
return Common::kNoError;
}
//#if PLUGIN_ENABLED_DYNAMIC(RISCOS)
//REGISTER_PLUGIN_DYNAMIC(RISCOS, PLUGIN_TYPE_MUSIC, RISCOSMusicPlugin);
//#else
REGISTER_PLUGIN_STATIC(RISCOS, PLUGIN_TYPE_MUSIC, RISCOSMusicPlugin);
//#endif
#endif // RISCOS
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