mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-23 18:24:59 +00:00
377 lines
11 KiB
C++
377 lines
11 KiB
C++
/* 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.
|
|
*
|
|
* $URL$
|
|
* $Id$
|
|
*/
|
|
|
|
#include "audio/softsynth/cms.h"
|
|
#include "audio/null.h"
|
|
|
|
#include "common/textconsole.h"
|
|
#include "common/translation.h"
|
|
#include "common/debug.h"
|
|
|
|
// CMS/Gameblaster Emulation taken from DosBox
|
|
|
|
#define LEFT 0x00
|
|
#define RIGHT 0x01
|
|
|
|
static const byte envelope[8][64] = {
|
|
/* zero amplitude */
|
|
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
|
|
/* maximum amplitude */
|
|
{15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,
|
|
15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,
|
|
15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,
|
|
15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15, },
|
|
/* single decay */
|
|
{15,14,13,12,11,10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
|
|
/* repetitive decay */
|
|
{15,14,13,12,11,10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0,
|
|
15,14,13,12,11,10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0,
|
|
15,14,13,12,11,10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0,
|
|
15,14,13,12,11,10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0 },
|
|
/* single triangular */
|
|
{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15,
|
|
15,14,13,12,11,10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
|
|
/* repetitive triangular */
|
|
{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15,
|
|
15,14,13,12,11,10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0,
|
|
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15,
|
|
15,14,13,12,11,10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0 },
|
|
/* single attack */
|
|
{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
|
|
/* repetitive attack */
|
|
{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15,
|
|
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15,
|
|
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15,
|
|
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15 }
|
|
};
|
|
|
|
static const int amplitude_lookup[16] = {
|
|
0*32767/16, 1*32767/16, 2*32767/16, 3*32767/16,
|
|
4*32767/16, 5*32767/16, 6*32767/16, 7*32767/16,
|
|
8*32767/16, 9*32767/16, 10*32767/16, 11*32767/16,
|
|
12*32767/16, 13*32767/16, 14*32767/16, 15*32767/16
|
|
};
|
|
|
|
void CMSEmulator::portWrite(int port, int val) {
|
|
switch (port) {
|
|
case 0x220:
|
|
portWriteIntern(0, 1, val);
|
|
break;
|
|
|
|
case 0x221:
|
|
_saa1099[0].selected_reg = val & 0x1f;
|
|
if (_saa1099[0].selected_reg == 0x18 || _saa1099[0].selected_reg == 0x19) {
|
|
/* clock the envelope channels */
|
|
if (_saa1099[0].env_clock[0])
|
|
envelope(0, 0);
|
|
if (_saa1099[0].env_clock[1])
|
|
envelope(0, 1);
|
|
}
|
|
break;
|
|
|
|
case 0x222:
|
|
portWriteIntern(1, 1, val);
|
|
break;
|
|
|
|
case 0x223:
|
|
_saa1099[1].selected_reg = val & 0x1f;
|
|
if (_saa1099[1].selected_reg == 0x18 || _saa1099[1].selected_reg == 0x19) {
|
|
/* clock the envelope channels */
|
|
if (_saa1099[1].env_clock[0])
|
|
envelope(1, 0);
|
|
if (_saa1099[1].env_clock[1])
|
|
envelope(1, 1);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
warning("CMSEmulator got port: 0x%X", port);
|
|
break;
|
|
}
|
|
}
|
|
|
|
void CMSEmulator::readBuffer(int16 *buffer, const int numSamples) {
|
|
update(0, &buffer[0], numSamples);
|
|
update(1, &buffer[0], numSamples);
|
|
}
|
|
|
|
void CMSEmulator::envelope(int chip, int ch) {
|
|
SAA1099 *saa = &_saa1099[chip];
|
|
if (saa->env_enable[ch]) {
|
|
int step, mode, mask;
|
|
mode = saa->env_mode[ch];
|
|
/* step from 0..63 and then loop in steps 32..63 */
|
|
step = saa->env_step[ch] = ((saa->env_step[ch] + 1) & 0x3f) | (saa->env_step[ch] & 0x20);
|
|
|
|
mask = 15;
|
|
if (saa->env_bits[ch])
|
|
mask &= ~1; /* 3 bit resolution, mask LSB */
|
|
|
|
saa->channels[ch*3+0].envelope[ LEFT] =
|
|
saa->channels[ch*3+1].envelope[ LEFT] =
|
|
saa->channels[ch*3+2].envelope[ LEFT] = ::envelope[mode][step] & mask;
|
|
if (saa->env_reverse_right[ch] & 0x01) {
|
|
saa->channels[ch*3+0].envelope[RIGHT] =
|
|
saa->channels[ch*3+1].envelope[RIGHT] =
|
|
saa->channels[ch*3+2].envelope[RIGHT] = (15 - ::envelope[mode][step]) & mask;
|
|
} else {
|
|
saa->channels[ch*3+0].envelope[RIGHT] =
|
|
saa->channels[ch*3+1].envelope[RIGHT] =
|
|
saa->channels[ch*3+2].envelope[RIGHT] = ::envelope[mode][step] & mask;
|
|
}
|
|
} else {
|
|
/* envelope mode off, set all envelope factors to 16 */
|
|
saa->channels[ch*3+0].envelope[ LEFT] =
|
|
saa->channels[ch*3+1].envelope[ LEFT] =
|
|
saa->channels[ch*3+2].envelope[ LEFT] =
|
|
saa->channels[ch*3+0].envelope[RIGHT] =
|
|
saa->channels[ch*3+1].envelope[RIGHT] =
|
|
saa->channels[ch*3+2].envelope[RIGHT] = 16;
|
|
}
|
|
}
|
|
|
|
void CMSEmulator::update(int chip, int16 *buffer, int length) {
|
|
struct SAA1099 *saa = &_saa1099[chip];
|
|
int j, ch;
|
|
|
|
/* if the channels are disabled we're done */
|
|
if (!saa->all_ch_enable) {
|
|
/* init output data */
|
|
if (chip == 0) {
|
|
memset(buffer, 0, sizeof(int16)*length*2);
|
|
}
|
|
return;
|
|
}
|
|
|
|
if (chip == 0) {
|
|
memset(buffer, 0, sizeof(int16)*length*2);
|
|
}
|
|
|
|
for (ch = 0; ch < 2; ch++) {
|
|
switch (saa->noise_params[ch]) {
|
|
case 0: saa->noise[ch].freq = 31250.0 * 2; break;
|
|
case 1: saa->noise[ch].freq = 15625.0 * 2; break;
|
|
case 2: saa->noise[ch].freq = 7812.5 * 2; break;
|
|
case 3: saa->noise[ch].freq = saa->channels[ch * 3].freq; break;
|
|
}
|
|
}
|
|
|
|
/* fill all data needed */
|
|
for (j = 0; j < length; ++j) {
|
|
int output_l = 0, output_r = 0;
|
|
|
|
/* for each channel */
|
|
for (ch = 0; ch < 6; ch++) {
|
|
if (saa->channels[ch].freq == 0.0)
|
|
saa->channels[ch].freq = (double)((2 * 15625) << saa->channels[ch].octave) /
|
|
(511.0 - (double)saa->channels[ch].frequency);
|
|
|
|
/* check the actual position in the square wave */
|
|
saa->channels[ch].counter -= saa->channels[ch].freq;
|
|
while (saa->channels[ch].counter < 0) {
|
|
/* calculate new frequency now after the half wave is updated */
|
|
saa->channels[ch].freq = (double)((2 * 15625) << saa->channels[ch].octave) /
|
|
(511.0 - (double)saa->channels[ch].frequency);
|
|
|
|
saa->channels[ch].counter += _sampleRate;
|
|
saa->channels[ch].level ^= 1;
|
|
|
|
/* eventually clock the envelope counters */
|
|
if (ch == 1 && saa->env_clock[0] == 0)
|
|
envelope(chip, 0);
|
|
if (ch == 4 && saa->env_clock[1] == 0)
|
|
envelope(chip, 1);
|
|
}
|
|
|
|
/* if the noise is enabled */
|
|
if (saa->channels[ch].noise_enable) {
|
|
/* if the noise level is high (noise 0: chan 0-2, noise 1: chan 3-5) */
|
|
if (saa->noise[ch/3].level & 1) {
|
|
/* subtract to avoid overflows, also use only half amplitude */
|
|
output_l -= saa->channels[ch].amplitude[ LEFT] * saa->channels[ch].envelope[ LEFT] / 16 / 2;
|
|
output_r -= saa->channels[ch].amplitude[RIGHT] * saa->channels[ch].envelope[RIGHT] / 16 / 2;
|
|
}
|
|
}
|
|
|
|
/* if the square wave is enabled */
|
|
if (saa->channels[ch].freq_enable) {
|
|
/* if the channel level is high */
|
|
if (saa->channels[ch].level & 1) {
|
|
output_l += saa->channels[ch].amplitude[ LEFT] * saa->channels[ch].envelope[ LEFT] / 16;
|
|
output_r += saa->channels[ch].amplitude[RIGHT] * saa->channels[ch].envelope[RIGHT] / 16;
|
|
}
|
|
}
|
|
}
|
|
|
|
for (ch = 0; ch < 2; ch++) {
|
|
/* check the actual position in noise generator */
|
|
saa->noise[ch].counter -= saa->noise[ch].freq;
|
|
while (saa->noise[ch].counter < 0) {
|
|
saa->noise[ch].counter += _sampleRate;
|
|
if (((saa->noise[ch].level & 0x4000) == 0) == ((saa->noise[ch].level & 0x0040) == 0) )
|
|
saa->noise[ch].level = (saa->noise[ch].level << 1) | 1;
|
|
else
|
|
saa->noise[ch].level <<= 1;
|
|
}
|
|
}
|
|
/* write sound data to the buffer */
|
|
buffer[j*2] += output_l / 6;
|
|
buffer[j*2+1] += output_r / 6;
|
|
}
|
|
}
|
|
|
|
void CMSEmulator::portWriteIntern(int chip, int offset, int data) {
|
|
SAA1099 *saa = &_saa1099[chip];
|
|
int reg = saa->selected_reg;
|
|
int ch;
|
|
|
|
switch (reg) {
|
|
/* channel i amplitude */
|
|
case 0x00:
|
|
case 0x01:
|
|
case 0x02:
|
|
case 0x03:
|
|
case 0x04:
|
|
case 0x05:
|
|
ch = reg & 7;
|
|
saa->channels[ch].amplitude[LEFT] = amplitude_lookup[data & 0x0f];
|
|
saa->channels[ch].amplitude[RIGHT] = amplitude_lookup[(data >> 4) & 0x0f];
|
|
break;
|
|
|
|
/* channel i frequency */
|
|
case 0x08:
|
|
case 0x09:
|
|
case 0x0a:
|
|
case 0x0b:
|
|
case 0x0c:
|
|
case 0x0d:
|
|
ch = reg & 7;
|
|
saa->channels[ch].frequency = data & 0xff;
|
|
break;
|
|
|
|
/* channel i octave */
|
|
case 0x10:
|
|
case 0x11:
|
|
case 0x12:
|
|
ch = (reg - 0x10) << 1;
|
|
saa->channels[ch + 0].octave = data & 0x07;
|
|
saa->channels[ch + 1].octave = (data >> 4) & 0x07;
|
|
break;
|
|
|
|
/* channel i frequency enable */
|
|
case 0x14:
|
|
saa->channels[0].freq_enable = data & 0x01;
|
|
saa->channels[1].freq_enable = data & 0x02;
|
|
saa->channels[2].freq_enable = data & 0x04;
|
|
saa->channels[3].freq_enable = data & 0x08;
|
|
saa->channels[4].freq_enable = data & 0x10;
|
|
saa->channels[5].freq_enable = data & 0x20;
|
|
break;
|
|
|
|
/* channel i noise enable */
|
|
case 0x15:
|
|
saa->channels[0].noise_enable = data & 0x01;
|
|
saa->channels[1].noise_enable = data & 0x02;
|
|
saa->channels[2].noise_enable = data & 0x04;
|
|
saa->channels[3].noise_enable = data & 0x08;
|
|
saa->channels[4].noise_enable = data & 0x10;
|
|
saa->channels[5].noise_enable = data & 0x20;
|
|
break;
|
|
|
|
/* noise generators parameters */
|
|
case 0x16:
|
|
saa->noise_params[0] = data & 0x03;
|
|
saa->noise_params[1] = (data >> 4) & 0x03;
|
|
break;
|
|
|
|
/* envelope generators parameters */
|
|
case 0x18:
|
|
case 0x19:
|
|
ch = reg - 0x18;
|
|
saa->env_reverse_right[ch] = data & 0x01;
|
|
saa->env_mode[ch] = (data >> 1) & 0x07;
|
|
saa->env_bits[ch] = data & 0x10;
|
|
saa->env_clock[ch] = data & 0x20;
|
|
saa->env_enable[ch] = data & 0x80;
|
|
/* reset the envelope */
|
|
saa->env_step[ch] = 0;
|
|
break;
|
|
|
|
/* channels enable & reset generators */
|
|
case 0x1c:
|
|
saa->all_ch_enable = data & 0x01;
|
|
saa->sync_state = data & 0x02;
|
|
if (data & 0x02) {
|
|
int i;
|
|
/* Synch & Reset generators */
|
|
for (i = 0; i < 6; i++) {
|
|
saa->channels[i].level = 0;
|
|
saa->channels[i].counter = 0.0;
|
|
}
|
|
}
|
|
break;
|
|
|
|
default:
|
|
// The CMS allows all registers to be written, so we just output some debug
|
|
// message here
|
|
debug(5, "CMS Unknown write to reg %x with %x",reg, data);
|
|
}
|
|
}
|
|
|
|
class CMSMusicPlugin : public NullMusicPlugin {
|
|
public:
|
|
const char *getName() const {
|
|
return _s("Creative Music System Emulator");
|
|
}
|
|
|
|
const char *getId() const {
|
|
return "cms";
|
|
}
|
|
|
|
MusicDevices getDevices() const;
|
|
};
|
|
|
|
MusicDevices CMSMusicPlugin::getDevices() const {
|
|
MusicDevices devices;
|
|
devices.push_back(MusicDevice(this, "", MT_CMS));
|
|
return devices;
|
|
}
|
|
|
|
//#if PLUGIN_ENABLED_DYNAMIC(CMS)
|
|
//REGISTER_PLUGIN_DYNAMIC(CMS, PLUGIN_TYPE_MUSIC, CMSMusicPlugin);
|
|
//#else
|
|
REGISTER_PLUGIN_STATIC(CMS, PLUGIN_TYPE_MUSIC, CMSMusicPlugin);
|
|
//#endif
|