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-rw-r--r--engines/scumm/player_v2cms.cpp385
1 files changed, 2 insertions, 383 deletions
diff --git a/engines/scumm/player_v2cms.cpp b/engines/scumm/player_v2cms.cpp
index e3e7bc1901..ba60a31061 100644
--- a/engines/scumm/player_v2cms.cpp
+++ b/engines/scumm/player_v2cms.cpp
@@ -28,6 +28,7 @@
#include "scumm/scumm.h"
#include "sound/mididrv.h"
#include "sound/mixer.h"
+#include "sound/softsynth/cms.h"
namespace Scumm {
@@ -40,395 +41,13 @@ namespace Scumm {
#define FB_WNOISE 0x12000 /* feedback for white noise */
#define FB_PNOISE 0x08000 /* feedback for periodic noise */
-// CMS/Gameblaster Emulation taken from DosBox
-
-#define LEFT 0x00
-#define RIGHT 0x01
-#define MAX_OUTPUT 0x7fff
-#define MIN_OUTPUT -0x8000
-//#define CMS_BUFFER_SIZE 128
-#define CMS_RATE 22050
-
#define PROCESS_ATTACK 1
#define PROCESS_RELEASE 2
#define PROCESS_SUSTAIN 3
#define PROCESS_DECAY 4
#define PROCESS_VIBRATO 5
-/* this structure defines a channel */
-struct saa1099_channel {
- int frequency; /* frequency (0x00..0xff) */
- int freq_enable; /* frequency enable */
- int noise_enable; /* noise enable */
- int octave; /* octave (0x00..0x07) */
- int amplitude[2]; /* amplitude (0x00..0x0f) */
- int envelope[2]; /* envelope (0x00..0x0f or 0x10 == off) */
-
- /* vars to simulate the square wave */
- double counter;
- double freq;
- int level;
-};
-
-/* this structure defines a noise channel */
-struct saa1099_noise {
- /* vars to simulate the noise generator output */
- double counter;
- double freq;
- int level; /* noise polynomal shifter */
-};
-
-/* this structure defines a SAA1099 chip */
-struct SAA1099 {
- int stream; /* our stream */
- int noise_params[2]; /* noise generators parameters */
- int env_enable[2]; /* envelope generators enable */
- int env_reverse_right[2]; /* envelope reversed for right channel */
- int env_mode[2]; /* envelope generators mode */
- int env_bits[2]; /* non zero = 3 bits resolution */
- int env_clock[2]; /* envelope clock mode (non-zero external) */
- int env_step[2]; /* current envelope step */
- int all_ch_enable; /* all channels enable */
- int sync_state; /* sync all channels */
- int selected_reg; /* selected register */
- struct saa1099_channel channels[6]; /* channels */
- struct saa1099_noise noise[2]; /* noise generators */
-};
-
-static 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 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
-};
-
-class CMSEmulator {
-public:
- CMSEmulator(uint32 sampleRate) {
- _sampleRate = sampleRate;
- memset(_saa1099, 0, sizeof(SAA1099)*2);
- }
-
- ~CMSEmulator() { }
-
- void portWrite(int port, int val);
- void readBuffer(int16 *buffer, const int numSamples);
-private:
- uint32 _sampleRate;
-
- SAA1099 _saa1099[2];
-
- void envelope(int chip, int ch);
- void update(int chip, int16 *buffer, int length);
- void portWriteIntern(int chip, int offset, int data);
-};
-
-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] = Scumm::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 - Scumm::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] = Scumm::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: /* Error! */
- error("CMS Unkown write to reg %x with %x",reg, data);
- }
-}
-
-#pragma mark -
-#pragma mark - Player_V2CMS
-#pragma mark -
+#define CMS_RATE 22050
const uint8 note_lengths[] = {
0,
generated by cgit v1.2.3 (git 2.25.1) at 2024-08-29 08:16:18 +0000