mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-05 00:36:57 +00:00
350 lines
8.9 KiB
C++
350 lines
8.9 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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/* OPL implementation for hardware OPL using ALSA Direct FM API.
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*
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* Caveats and limitations:
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* - Pretends to be a softsynth (emitting silence).
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* - Dual OPL2 mode requires OPL3 hardware.
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* - Every register write leads to a series of register writes on the hardware,
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* due to the lack of direct register access in the ALSA Direct FM API.
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* - No timers
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*/
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#define FORBIDDEN_SYMBOL_ALLOW_ALL
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#include "common/scummsys.h"
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#include "common/debug.h"
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#include "common/str.h"
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#include "audio/fmopl.h"
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#include <sys/ioctl.h>
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#include <alsa/asoundlib.h>
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#include <sound/asound_fm.h>
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namespace OPL {
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namespace ALSA {
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class OPL : public ::OPL::RealOPL {
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private:
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enum {
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kOpl2Voices = 9,
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kVoices = 18,
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kOpl2Operators = 18,
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kOperators = 36
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};
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Config::OplType _type;
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int _iface;
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snd_hwdep_t *_opl;
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snd_dm_fm_voice _oper[kOperators];
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snd_dm_fm_note _voice[kVoices];
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snd_dm_fm_params _params;
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int index[2];
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static const int voiceToOper0[kVoices];
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static const int regOffsetToOper[0x20];
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void writeOplReg(int c, int r, int v);
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void clear();
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public:
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OPL(Config::OplType type);
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~OPL();
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bool init();
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void reset();
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void write(int a, int v);
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byte read(int a);
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void writeReg(int r, int v);
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};
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const int OPL::voiceToOper0[OPL::kVoices] =
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{ 0, 1, 2, 6, 7, 8, 12, 13, 14, 18, 19, 20, 24, 25, 26, 30, 31, 32 };
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const int OPL::regOffsetToOper[0x20] =
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{ 0, 1, 2, 3, 4, 5, -1, -1, 6, 7, 8, 9, 10, 11, -1, -1,
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12, 13, 14, 15, 16, 17, -1, -1, -1, -1, -1, -1, -1, -1, -1 };
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OPL::OPL(Config::OplType type) : _type(type), _opl(nullptr), _iface(0) {
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}
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OPL::~OPL() {
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stop();
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if (_opl) {
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snd_hwdep_ioctl(_opl, SNDRV_DM_FM_IOCTL_RESET, nullptr);
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snd_hwdep_close(_opl);
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}
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}
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void OPL::clear() {
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index[0] = index[1] = 0;
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memset(_oper, 0, sizeof(_oper));
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memset(_voice, 0, sizeof(_voice));
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memset(&_params, 0, sizeof(_params));
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for (int i = 0; i < kOperators; ++i) {
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_oper[i].op = (i / 3) % 2;
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_oper[i].voice = (i / 6) * 3 + (i % 3);
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}
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for (int i = 0; i < kVoices; ++i)
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_voice[i].voice = i;
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// For OPL3 hardware we need to set up the panning in OPL2 modes
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if (_iface == SND_HWDEP_IFACE_OPL3) {
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if (_type == Config::kDualOpl2) {
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for (int i = 0; i < kOpl2Operators; ++i)
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_oper[i].left = 1; // FIXME below
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for (int i = kOpl2Operators; i < kOperators; ++i)
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_oper[i].right = 1;
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} else if (_type == Config::kOpl2) {
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for (int i = 0; i < kOpl2Operators; ++i) {
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_oper[i].left = 1;
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_oper[i].right = 1;
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}
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}
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}
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}
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bool OPL::init() {
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clear();
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int card = -1;
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snd_ctl_t *ctl;
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snd_hwdep_info_t *info;
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snd_hwdep_info_alloca(&info);
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int iface = SND_HWDEP_IFACE_OPL3;
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if (_type == Config::kOpl2)
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iface = SND_HWDEP_IFACE_OPL2;
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// Look for OPL hwdep interface
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while (!snd_card_next(&card) && card >= 0) {
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int dev = -1;
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Common::String name = Common::String::format("hw:%d", card);
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if (snd_ctl_open(&ctl, name.c_str(), 0) < 0)
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continue;
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while (!snd_ctl_hwdep_next_device(ctl, &dev) && dev >= 0) {
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name = Common::String::format("hw:%d,%d", card, dev);
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if (snd_hwdep_open(&_opl, name.c_str(), SND_HWDEP_OPEN_WRITE) < 0)
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continue;
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if (!snd_hwdep_info(_opl, info)) {
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int found = snd_hwdep_info_get_iface(info);
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// OPL3 can be used for (Dual) OPL2 mode
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if (found == iface || found == SND_HWDEP_IFACE_OPL3) {
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snd_ctl_close(ctl);
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_iface = found;
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reset();
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return true;
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}
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}
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// Wrong interface, try next device
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snd_hwdep_close(_opl);
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_opl = nullptr;
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}
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snd_ctl_close(ctl);
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}
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return false;
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}
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void OPL::reset() {
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snd_hwdep_ioctl(_opl, SNDRV_DM_FM_IOCTL_RESET, nullptr);
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if (_iface == SND_HWDEP_IFACE_OPL3)
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snd_hwdep_ioctl(_opl, SNDRV_DM_FM_IOCTL_SET_MODE, (void *)SNDRV_DM_FM_MODE_OPL3);
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clear();
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// Sync up with the hardware
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snd_hwdep_ioctl(_opl, SNDRV_DM_FM_IOCTL_SET_PARAMS, (void *)&_params);
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for (uint i = 0; i < (_iface == SND_HWDEP_IFACE_OPL3 ? kVoices : kOpl2Voices); ++i)
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snd_hwdep_ioctl(_opl, SNDRV_DM_FM_IOCTL_PLAY_NOTE, (void *)&_voice[i]);
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for (uint i = 0; i < (_iface == SND_HWDEP_IFACE_OPL3 ? kOperators : kOpl2Operators); ++i)
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snd_hwdep_ioctl(_opl, SNDRV_DM_FM_IOCTL_SET_VOICE, (void *)&_oper[i]);
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}
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void OPL::write(int port, int val) {
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val &= 0xff;
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int chip = (port & 2) >> 1;
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if (port & 1) {
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switch(_type) {
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case Config::kOpl2:
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writeOplReg(0, index[0], val);
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break;
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case Config::kDualOpl2:
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if (port & 8) {
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writeOplReg(0, index[0], val);
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writeOplReg(1, index[1], val);
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} else
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writeOplReg(chip, index[chip], val);
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break;
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case Config::kOpl3:
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writeOplReg(chip, index[chip], val);
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}
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} else {
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switch(_type) {
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case Config::kOpl2:
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index[0] = val;
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break;
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case Config::kDualOpl2:
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if (port & 8) {
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index[0] = val;
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index[1] = val;
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} else
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index[chip] = val;
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break;
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case Config::kOpl3:
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index[chip] = val;
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}
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}
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}
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byte OPL::read(int port) {
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return 0;
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}
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void OPL::writeReg(int r, int v) {
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switch (_type) {
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case Config::kOpl2:
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writeOplReg(0, r, v);
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break;
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case Config::kDualOpl2:
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writeOplReg(0, r, v);
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writeOplReg(1, r, v);
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break;
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case Config::kOpl3:
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writeOplReg(r >= 0x100, r & 0xff, v);
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}
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}
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void OPL::writeOplReg(int c, int r, int v) {
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if (r == 0x04 && c == 1 && _type == Config::kOpl3) {
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snd_hwdep_ioctl(_opl, SNDRV_DM_FM_IOCTL_SET_CONNECTION, reinterpret_cast<void *>(v & 0x3f));
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} else if (r == 0x08 && c == 0) {
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_params.kbd_split = (v >> 6) & 0x1;
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snd_hwdep_ioctl(_opl, SNDRV_DM_FM_IOCTL_SET_PARAMS, (void *)&_params);
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} else if (r == 0xbd && c == 0) {
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_params.hihat = v & 0x1;
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_params.cymbal = (v >> 1) & 0x1;
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_params.tomtom = (v >> 2) & 0x1;
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_params.snare = (v >> 3) & 0x1;
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_params.bass = (v >> 4) & 0x1;
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_params.rhythm = (v >> 5) & 0x1;
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_params.vib_depth = (v >> 6) & 0x1;
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_params.am_depth = (v >> 7) & 0x1;
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snd_hwdep_ioctl(_opl, SNDRV_DM_FM_IOCTL_SET_PARAMS, (void *)&_params);
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} else if (r < 0xa0 || r >= 0xe0) {
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// Operator
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int idx = regOffsetToOper[r & 0x1f];
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if (idx == -1)
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return;
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if (c == 1)
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idx += kOpl2Operators;
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switch (r & 0xf0) {
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case 0x20:
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case 0x30:
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_oper[idx].harmonic = v & 0xf;
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_oper[idx].kbd_scale = (v >> 4) & 0x1;
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_oper[idx].do_sustain = (v >> 5) & 0x1;
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_oper[idx].vibrato = (v >> 6) & 0x1;
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_oper[idx].am = (v >> 7) & 0x1;
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snd_hwdep_ioctl(_opl, SNDRV_DM_FM_IOCTL_SET_VOICE, (void *)&_oper[idx]);
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break;
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case 0x40:
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case 0x50:
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_oper[idx].volume = ~v & 0x3f;
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_oper[idx].scale_level = (v >> 6) & 0x3;
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snd_hwdep_ioctl(_opl, SNDRV_DM_FM_IOCTL_SET_VOICE, (void *)&_oper[idx]);
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break;
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case 0x60:
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case 0x70:
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_oper[idx].decay = v & 0xf;
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_oper[idx].attack = (v >> 4) & 0xf;
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snd_hwdep_ioctl(_opl, SNDRV_DM_FM_IOCTL_SET_VOICE, (void *)&_oper[idx]);
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break;
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case 0x80:
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case 0x90:
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_oper[idx].release = v & 0xf;
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_oper[idx].sustain = (v >> 4) & 0xf;
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snd_hwdep_ioctl(_opl, SNDRV_DM_FM_IOCTL_SET_VOICE, (void *)&_oper[idx]);
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break;
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case 0xe0:
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case 0xf0:
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_oper[idx].waveform = v & (_type == Config::kOpl3 ? 0x7 : 0x3);
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snd_hwdep_ioctl(_opl, SNDRV_DM_FM_IOCTL_SET_VOICE, (void *)&_oper[idx]);
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}
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} else {
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// Voice
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int idx = r & 0xf;
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if (idx >= kOpl2Voices)
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return;
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if (c == 1)
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idx += kOpl2Voices;
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int opIdx = voiceToOper0[idx];
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switch (r & 0xf0) {
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case 0xa0:
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_voice[idx].fnum = (_voice[idx].fnum & 0x300) | (v & 0xff);
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snd_hwdep_ioctl(_opl, SNDRV_DM_FM_IOCTL_PLAY_NOTE, (void *)&_voice[idx]);
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break;
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case 0xb0:
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_voice[idx].fnum = ((v << 8) & 0x300) | (_voice[idx].fnum & 0xff);
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_voice[idx].octave = (v >> 2) & 0x7;
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_voice[idx].key_on = (v >> 5) & 0x1;
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snd_hwdep_ioctl(_opl, SNDRV_DM_FM_IOCTL_PLAY_NOTE, (void *)&_voice[idx]);
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break;
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case 0xc0:
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_oper[opIdx].connection = _oper[opIdx + 3].connection = v & 0x1;
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_oper[opIdx].feedback = _oper[opIdx + 3].feedback = (v >> 1) & 0x7;
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if (_type == Config::kOpl3) {
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_oper[opIdx].left = _oper[opIdx + 3].left = (v >> 4) & 0x1;
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_oper[opIdx].right = _oper[opIdx + 3].right = (v >> 5) & 0x1;
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}
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snd_hwdep_ioctl(_opl, SNDRV_DM_FM_IOCTL_SET_VOICE, (void *)&_oper[opIdx]);
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}
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}
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}
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OPL *create(Config::OplType type) {
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return new OPL(type);
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}
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} // End of namespace ALSA
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} // End of namespace OPL
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