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snes9x2005/source/soundux.c
twinaphex 78b32e05a8 C++ comments need to become C
2017-08-14 08:06:11 +02:00

1034 lines
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#include "../copyright"
#ifndef USE_BLARGG_APU
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#define CLIP16(v) \
if ((v) < -32768) \
(v) = -32768; \
else \
if ((v) > 32767) \
(v) = 32767
#define CLIP8(v) \
if ((v) < -128) \
(v) = -128; \
else if ((v) > 127) \
(v) = 127
#include "snes9x.h"
#include "soundux.h"
#include "apu.h"
#include "memmap.h"
#include "cpuexec.h"
extern int32_t Echo [24000];
extern int32_t MixBuffer [SOUND_BUFFER_SIZE];
extern int32_t EchoBuffer [SOUND_BUFFER_SIZE];
extern int32_t FilterTaps [8];
static uint8_t FilterTapDefinitionBitfield;
/* In the above, bit I is set if FilterTaps[I] is non-zero. */
extern uint32_t Z;
extern int32_t Loop [16];
extern int32_t FilterValues[4][2];
extern int32_t NoiseFreq [32];
uint32_t AttackRate [16] =
{
4100, 2600, 1500, 1000, 640, 380, 260, 160,
96, 64, 40, 24, 16, 10, 6, 1
};
uint32_t DecayRate [8] =
{
1200, 740, 440, 290, 180, 110, 74, 37
};
uint32_t DecreaseRateExp [32] =
{
0xFFFFFFFF, 38000, 28000, 24000, 19000, 14000, 12000, 9400,
7100, 5900, 4700, 3500, 2900, 2400, 1800, 1500,
1200, 880, 740, 590, 440, 370, 290, 220,
180, 150, 110, 92, 74, 55, 37, 18
};
uint32_t IncreaseRate [32] =
{
0xFFFFFFFF, 4100, 3100, 2600, 2000, 1500, 1300, 1000,
770, 640, 510, 380, 320, 260, 190, 160,
130, 96, 80, 64, 48, 40, 32, 24,
20, 16, 12, 10, 8, 6, 4, 2
};
#define SustainRate DecreaseRateExp
/* precalculated env rates for S9xSetEnvRate */
uint32_t AttackERate [16][10];
uint32_t DecayERate [8][10];
uint32_t SustainERate [32][10];
uint32_t IncreaseERate [32][10];
uint32_t DecreaseERateExp[32][10];
uint32_t KeyOffERate [10];
#define FIXED_POINT 0x10000UL
#define FIXED_POINT_REMAINDER 0xffffUL
#define FIXED_POINT_SHIFT 16
#define VOL_DIV16 0x0080
#define ENVX_SHIFT 24
/* F is channel's current frequency and M is the 16-bit modulation waveform
* from the previous channel multiplied by the current envelope volume level. */
#define PITCH_MOD(F,M) ((F) * ((((uint32_t) (M)) + 0x800000) >> 16) >> 7)
#define LAST_SAMPLE 0xffffff
#define JUST_PLAYED_LAST_SAMPLE(c) ((c)->sample_pointer >= LAST_SAMPLE)
static inline uint8_t* S9xGetSampleAddress(int32_t sample_number)
{
uint32_t addr = (((APU.DSP[APU_DIR] << 8) + (sample_number << 2)) & 0xffff);
return (IAPU.RAM + addr);
}
void S9xAPUSetEndOfSample(int32_t i, Channel* ch)
{
ch->state = SOUND_SILENT;
ch->mode = MODE_NONE;
APU.DSP [APU_ENDX] |= 1 << i;
APU.DSP [APU_KON] &= ~(1 << i);
APU.DSP [APU_KOFF] &= ~(1 << i);
APU.KeyedChannels &= ~(1 << i);
}
void S9xAPUSetEndX(int32_t ch)
{
APU.DSP [APU_ENDX] |= 1 << ch;
}
void S9xSetEnvRate(Channel* ch, uint32_t rate, int32_t direction, int32_t target, uint32_t mode)
{
ch->envx_target = target;
if (rate == ~((uint32_t) 0u))
{
ch->direction = 0;
rate = 0;
}
else
ch->direction = direction;
if (rate == 0 || so.playback_rate == 0)
ch->erate = 0;
else
{
switch (mode >> 28)
{
case 0: // Attack
ch->erate = AttackERate[ch->env_ind_attack][ch->state];
break;
case 1: // Decay
ch->erate = DecayERate[ch->env_ind_decay][ch->state];
break;
case 2: // Sustain
ch->erate = SustainERate[ch->env_ind_sustain][ch->state];
break;
case 3: // Increase
ch->erate = IncreaseERate[mode & 0x1f][ch->state];
break;
case 4: // DecreaseExp
ch->erate = DecreaseERateExp[mode & 0x1f][ch->state];
break;
case 5: // KeyOff
ch->erate = KeyOffERate[ch->state];
break;
}
}
}
void S9xSetEnvelopeRate(int32_t channel, uint32_t rate, int32_t direction, int32_t target, uint32_t mode)
{
S9xSetEnvRate(&SoundData.channels [channel], rate, direction, target, mode);
}
void S9xSetSoundVolume(int32_t channel, int16_t volume_left, int16_t volume_right)
{
Channel* ch = &SoundData.channels[channel];
ch->volume_left = volume_left;
ch->volume_right = volume_right;
ch-> left_vol_level = (ch->envx * volume_left) / 128;
ch->right_vol_level = (ch->envx * volume_right) / 128;
}
void S9xSetMasterVolume(int16_t volume_left, int16_t volume_right)
{
if (Settings.DisableMasterVolume)
SoundData.master_volume [0] = SoundData.master_volume [1] = 127;
else
{
SoundData.master_volume [0] = volume_left;
SoundData.master_volume [1] = volume_right;
}
}
void S9xSetEchoVolume(int16_t volume_left, int16_t volume_right)
{
SoundData.echo_volume [0] = volume_left;
SoundData.echo_volume [1] = volume_right;
}
void S9xSetEchoEnable(uint8_t byte)
{
if (!SoundData.echo_write_enabled || Settings.DisableSoundEcho)
byte = 0;
if (byte && !SoundData.echo_enable)
{
memset(Echo, 0, sizeof(Echo));
memset(Loop, 0, sizeof(Loop));
}
SoundData.echo_enable = byte;
int32_t i;
for (i = 0; i < NUM_CHANNELS; i++)
{
if (byte & (1 << i))
SoundData.channels [i].echo_buf_ptr = EchoBuffer;
else
SoundData.channels [i].echo_buf_ptr = NULL;
}
}
void S9xSetEchoFeedback(int32_t feedback)
{
CLIP8(feedback);
SoundData.echo_feedback = feedback;
}
void S9xSetEchoDelay(int32_t delay)
{
SoundData.echo_buffer_size = (512 * delay * so.playback_rate) / 32000;
SoundData.echo_buffer_size <<= 1;
if (SoundData.echo_buffer_size)
SoundData.echo_ptr %= SoundData.echo_buffer_size;
else
SoundData.echo_ptr = 0;
S9xSetEchoEnable(APU.DSP [APU_EON]);
}
void S9xSetEchoWriteEnable(uint8_t byte)
{
SoundData.echo_write_enabled = byte;
S9xSetEchoDelay(APU.DSP [APU_EDL] & 15);
}
void S9xSetFrequencyModulationEnable(uint8_t byte)
{
SoundData.pitch_mod = byte & 0xFE;
}
void S9xSetSoundKeyOff(int32_t channel)
{
Channel* ch = &SoundData.channels[channel];
if (ch->state != SOUND_SILENT)
{
ch->state = SOUND_RELEASE;
ch->mode = MODE_RELEASE;
S9xSetEnvRate(ch, 8, -1, 0, 5 << 28);
}
}
void S9xFixSoundAfterSnapshotLoad()
{
SoundData.echo_write_enabled = !(APU.DSP [APU_FLG] & 0x20);
S9xSetEchoDelay(APU.DSP [APU_EDL] & 0xf);
S9xSetEchoFeedback((int8_t) APU.DSP [APU_EFB]);
S9xSetFilterCoefficient(0, (int8_t) APU.DSP [APU_C0]);
S9xSetFilterCoefficient(1, (int8_t) APU.DSP [APU_C1]);
S9xSetFilterCoefficient(2, (int8_t) APU.DSP [APU_C2]);
S9xSetFilterCoefficient(3, (int8_t) APU.DSP [APU_C3]);
S9xSetFilterCoefficient(4, (int8_t) APU.DSP [APU_C4]);
S9xSetFilterCoefficient(5, (int8_t) APU.DSP [APU_C5]);
S9xSetFilterCoefficient(6, (int8_t) APU.DSP [APU_C6]);
S9xSetFilterCoefficient(7, (int8_t) APU.DSP [APU_C7]);
int32_t i;
for (i = 0; i < 8; i++)
{
SoundData.channels[i].needs_decode = true;
S9xSetSoundFrequency(i, SoundData.channels[i].hertz);
SoundData.channels [i].envxx = SoundData.channels [i].envx << ENVX_SHIFT;
}
}
void S9xSetFilterCoefficient(int32_t tap, int32_t value)
{
FilterTaps [tap & 7] = value;
if (value == 0 || (tap == 0 && value == 127))
FilterTapDefinitionBitfield &= ~(1 << (tap & 7));
else
FilterTapDefinitionBitfield |= 1 << (tap & 7);
}
void S9xSetSoundADSR(int32_t channel, int32_t attack_ind, int32_t decay_ind, int32_t sustain_ind, int32_t sustain_level, int32_t release_rate)
{
int32_t attack_rate = AttackRate [attack_ind];
int32_t decay_rate = DecayRate [decay_ind];
int32_t sustain_rate = SustainRate [sustain_ind];
// Hack for ROMs that use a very short attack rate, key on a
// channel, then switch to decay mode. e.g. Final Fantasy II.
if(attack_rate == 1)
attack_rate = 0;
Channel* ch = &SoundData.channels[channel];
ch->env_ind_attack = attack_ind;
ch->env_ind_decay = decay_ind;
ch->env_ind_sustain = sustain_ind;
ch->attack_rate = attack_rate;
ch->decay_rate = decay_rate;
ch->sustain_rate = sustain_rate;
ch->release_rate = release_rate;
ch->sustain_level = sustain_level + 1;
switch (SoundData.channels[channel].state)
{
case SOUND_ATTACK:
S9xSetEnvRate(ch, attack_rate, 1, 127, 0);
break;
case SOUND_DECAY:
S9xSetEnvRate(ch, decay_rate, -1, (MAX_ENVELOPE_HEIGHT * (sustain_level + 1)) >> 3, 1 << 28);
break;
case SOUND_SUSTAIN:
S9xSetEnvRate(ch, sustain_rate, -1, 0, 2 << 28);
break;
}
}
void S9xSetEnvelopeHeight(int32_t channel, int32_t level)
{
Channel* ch = &SoundData.channels[channel];
ch->envx = level;
ch->envxx = level << ENVX_SHIFT;
ch->left_vol_level = (level * ch->volume_left) / 128;
ch->right_vol_level = (level * ch->volume_right) / 128;
if (ch->envx == 0 && ch->state != SOUND_SILENT && ch->state != SOUND_GAIN)
S9xAPUSetEndOfSample(channel, ch);
}
void S9xSetSoundFrequency(int32_t channel, int32_t hertz) // hertz [0~64K<<1]
{
if (SoundData.channels[channel].type == SOUND_NOISE)
hertz = NoiseFreq [APU.DSP [APU_FLG] & 0x1f];
SoundData.channels[channel].frequency = (hertz * so.freqbase) >> 11;
}
void S9xSetSoundHertz(int32_t channel, int32_t hertz)
{
SoundData.channels[channel].hertz = hertz;
S9xSetSoundFrequency(channel, hertz);
}
void S9xSetSoundType(int32_t channel, int32_t type_of_sound)
{
SoundData.channels[channel].type = type_of_sound;
}
void DecodeBlock(Channel* ch)
{
int32_t out;
uint8_t filter;
uint8_t shift;
int8_t sample1, sample2;
if (ch->block_pointer > 0x10000 - 9)
{
ch->last_block = true;
ch->loop = false;
ch->block = ch->decoded;
return;
}
int8_t* compressed = (int8_t*) &IAPU.RAM [ch->block_pointer];
filter = *compressed;
if ((ch->last_block = (bool) (filter & 1)))
ch->loop = (bool) (filter & 2);
int16_t* raw = ch->block = ch->decoded;
uint32_t i;
compressed++;
int32_t prev0 = ch->previous [0];
int32_t prev1 = ch->previous [1];
shift = filter >> 4;
switch ((filter >> 2) & 3)
{
case 0:
for (i = 8; i != 0; i--)
{
sample1 = *compressed++;
sample2 = sample1 << 4;
sample2 >>= 4;
sample1 >>= 4;
*raw++ = ((int32_t) sample1 << shift);
*raw++ = ((int32_t) sample2 << shift);
}
prev1 = *(raw - 2);
prev0 = *(raw - 1);
break;
case 1:
for (i = 8; i != 0; i--)
{
sample1 = *compressed++;
sample2 = sample1 << 4;
sample2 >>= 4;
sample1 >>= 4;
prev0 = (int16_t) prev0;
*raw++ = prev1 = ((int32_t) sample1 << shift) + prev0 - (prev0 >> 4);
prev1 = (int16_t) prev1;
*raw++ = prev0 = ((int32_t) sample2 << shift) + prev1 - (prev1 >> 4);
}
break;
case 2:
for (i = 8; i != 0; i--)
{
sample1 = *compressed++;
sample2 = sample1 << 4;
sample2 >>= 4;
sample1 >>= 4;
out = (sample1 << shift) - prev1 + (prev1 >> 4);
prev1 = (int16_t) prev0;
prev0 &= ~3;
*raw++ = prev0 = out + (prev0 << 1) - (prev0 >> 5) - (prev0 >> 4);
out = (sample2 << shift) - prev1 + (prev1 >> 4);
prev1 = (int16_t) prev0;
prev0 &= ~3;
*raw++ = prev0 = out + (prev0 << 1) - (prev0 >> 5) - (prev0 >> 4);
}
break;
case 3:
for (i = 8; i != 0; i--)
{
sample1 = *compressed++;
sample2 = sample1 << 4;
sample2 >>= 4;
sample1 >>= 4;
out = (sample1 << shift);
out = out - prev1 + (prev1 >> 3) + (prev1 >> 4);
prev1 = (int16_t) prev0;
prev0 &= ~3;
*raw++ = prev0 = out + (prev0 << 1) - (prev0 >> 3) - (prev0 >> 4) - (prev1 >> 6);
out = (sample2 << shift);
out = out - prev1 + (prev1 >> 3) + (prev1 >> 4);
prev1 = (int16_t) prev0;
prev0 &= ~3;
*raw++ = prev0 = out + (prev0 << 1) - (prev0 >> 3) - (prev0 >> 4) - (prev1 >> 6);
}
break;
}
ch->previous [0] = prev0;
ch->previous [1] = prev1;
ch->block_pointer += 9;
}
static inline void MixStereo(int32_t sample_count)
{
static int32_t wave[SOUND_BUFFER_SIZE];
int32_t pitch_mod = SoundData.pitch_mod & ~APU.DSP[APU_NON];
uint32_t J;
for (J = 0; J < NUM_CHANNELS; J++)
{
Channel* ch = &SoundData.channels[J];
if (ch->state == SOUND_SILENT)
continue;
int32_t VL, VR;
uint32_t freq0 = ch->frequency;
uint8_t mod = pitch_mod & (1 << J);
if (ch->needs_decode)
{
DecodeBlock(ch);
ch->needs_decode = false;
ch->sample = ch->block[0];
ch->sample_pointer = freq0 >> FIXED_POINT_SHIFT;
if (ch->sample_pointer == 0)
ch->sample_pointer = 1;
if (ch->sample_pointer > SOUND_DECODE_LENGTH)
ch->sample_pointer = SOUND_DECODE_LENGTH - 1;
ch->next_sample = ch->block[ch->sample_pointer];
ch->interpolate = 0;
if (Settings.InterpolatedSound && freq0 < FIXED_POINT && !mod)
ch->interpolate = ((ch->next_sample - ch->sample) * (int32_t) freq0) / (int32_t) FIXED_POINT;
}
VL = (ch->sample * ch-> left_vol_level) / 128;
VR = (ch->sample * ch->right_vol_level) / 128;
uint32_t I;
for (I = 0; I < (uint32_t) sample_count; I += 2)
{
uint32_t freq = freq0;
if (mod)
freq = PITCH_MOD(freq, wave [I / 2]);
ch->env_error += ch->erate;
if (ch->env_error >= FIXED_POINT)
{
uint32_t step = ch->env_error >> FIXED_POINT_SHIFT;
switch (ch->state)
{
case SOUND_ATTACK:
ch->env_error &= FIXED_POINT_REMAINDER;
ch->envx += step << 1;
ch->envxx = ch->envx << ENVX_SHIFT;
if (ch->envx >= 126)
{
ch->envx = 127;
ch->envxx = 127 << ENVX_SHIFT;
ch->state = SOUND_DECAY;
if (ch->sustain_level != 8)
{
S9xSetEnvRate(ch, ch->decay_rate, -1,
(MAX_ENVELOPE_HEIGHT * ch->sustain_level) >> 3, 1 << 28);
break;
}
ch->state = SOUND_SUSTAIN;
S9xSetEnvRate(ch, ch->sustain_rate, -1, 0, 2 << 28);
}
break;
case SOUND_DECAY:
while (ch->env_error >= FIXED_POINT)
{
ch->envxx = (ch->envxx >> 8) * 255;
ch->env_error -= FIXED_POINT;
}
ch->envx = ch->envxx >> ENVX_SHIFT;
if (ch->envx <= ch->envx_target)
{
if (ch->envx <= 0)
{
S9xAPUSetEndOfSample(J, ch);
goto stereo_exit;
}
ch->state = SOUND_SUSTAIN;
S9xSetEnvRate(ch, ch->sustain_rate, -1, 0, 2 << 28);
}
break;
case SOUND_SUSTAIN:
while (ch->env_error >= FIXED_POINT)
{
ch->envxx = (ch->envxx >> 8) * 255;
ch->env_error -= FIXED_POINT;
}
ch->envx = ch->envxx >> ENVX_SHIFT;
if (ch->envx <= 0)
{
S9xAPUSetEndOfSample(J, ch);
goto stereo_exit;
}
break;
case SOUND_RELEASE:
while (ch->env_error >= FIXED_POINT)
{
ch->envxx -= (MAX_ENVELOPE_HEIGHT << ENVX_SHIFT) / 256;
ch->env_error -= FIXED_POINT;
}
ch->envx = ch->envxx >> ENVX_SHIFT;
if (ch->envx <= 0)
{
S9xAPUSetEndOfSample(J, ch);
goto stereo_exit;
}
break;
case SOUND_INCREASE_LINEAR:
ch->env_error &= FIXED_POINT_REMAINDER;
ch->envx += step << 1;
ch->envxx = ch->envx << ENVX_SHIFT;
if (ch->envx >= 126)
{
ch->envx = 127;
ch->envxx = 127 << ENVX_SHIFT;
ch->state = SOUND_GAIN;
ch->mode = MODE_GAIN;
S9xSetEnvRate(ch, 0, -1, 0, 0);
}
break;
case SOUND_INCREASE_BENT_LINE:
if (ch->envx >= (MAX_ENVELOPE_HEIGHT * 3) / 4)
{
while (ch->env_error >= FIXED_POINT)
{
ch->envxx += (MAX_ENVELOPE_HEIGHT << ENVX_SHIFT) / 256;
ch->env_error -= FIXED_POINT;
}
ch->envx = ch->envxx >> ENVX_SHIFT;
}
else
{
ch->env_error &= FIXED_POINT_REMAINDER;
ch->envx += step << 1;
ch->envxx = ch->envx << ENVX_SHIFT;
}
if (ch->envx >= 126)
{
ch->envx = 127;
ch->envxx = 127 << ENVX_SHIFT;
ch->state = SOUND_GAIN;
ch->mode = MODE_GAIN;
S9xSetEnvRate(ch, 0, -1, 0, 0);
}
break;
case SOUND_DECREASE_LINEAR:
ch->env_error &= FIXED_POINT_REMAINDER;
ch->envx -= step << 1;
ch->envxx = ch->envx << ENVX_SHIFT;
if (ch->envx <= 0)
{
S9xAPUSetEndOfSample(J, ch);
goto stereo_exit;
}
break;
case SOUND_DECREASE_EXPONENTIAL:
while (ch->env_error >= FIXED_POINT)
{
ch->envxx = (ch->envxx >> 8) * 255;
ch->env_error -= FIXED_POINT;
}
ch->envx = ch->envxx >> ENVX_SHIFT;
if (ch->envx <= 0)
{
S9xAPUSetEndOfSample(J, ch);
goto stereo_exit;
}
break;
case SOUND_GAIN:
S9xSetEnvRate(ch, 0, -1, 0, 0);
break;
}
ch-> left_vol_level = (ch->envx * ch->volume_left) / 128;
ch->right_vol_level = (ch->envx * ch->volume_right) / 128;
VL = (ch->sample * ch-> left_vol_level) / 128;
VR = (ch->sample * ch->right_vol_level) / 128;
}
ch->count += freq;
if (ch->count >= FIXED_POINT)
{
VL = ch->count >> FIXED_POINT_SHIFT;
ch->sample_pointer += VL;
ch->count &= FIXED_POINT_REMAINDER;
ch->sample = ch->next_sample;
if (ch->sample_pointer >= SOUND_DECODE_LENGTH)
{
if (JUST_PLAYED_LAST_SAMPLE(ch))
{
S9xAPUSetEndOfSample(J, ch);
goto stereo_exit;
}
do
{
ch->sample_pointer -= SOUND_DECODE_LENGTH;
if (ch->last_block)
{
if (!ch->loop)
{
ch->sample_pointer = LAST_SAMPLE;
ch->next_sample = ch->sample;
break;
}
else
{
S9xAPUSetEndX(J);
ch->last_block = false;
uint8_t* dir = S9xGetSampleAddress(ch->sample_number);
ch->block_pointer = READ_WORD(dir + 2);
}
}
DecodeBlock(ch);
}
while (ch->sample_pointer >= SOUND_DECODE_LENGTH);
if (!JUST_PLAYED_LAST_SAMPLE(ch))
ch->next_sample = ch->block [ch->sample_pointer];
}
else
ch->next_sample = ch->block [ch->sample_pointer];
if (ch->type == SOUND_SAMPLE)
{
if (Settings.InterpolatedSound && freq < FIXED_POINT && !mod)
{
ch->interpolate = ((ch->next_sample - ch->sample) * (int32_t) freq) / (int32_t) FIXED_POINT;
ch->sample = (int16_t)(ch->sample + (((ch->next_sample - ch->sample) * (int32_t)(ch->count)) / (int32_t) FIXED_POINT));
}
else
ch->interpolate = 0;
}
else
{
// Snes9x 1.53's SPC_DSP.cpp, by blargg
int32_t feedback = (so.noise_gen << 13) ^ (so.noise_gen << 14);
so.noise_gen = (feedback & 0x4000) ^ (so.noise_gen >> 1);
ch->sample = (so.noise_gen << 17) >> 17;
ch->interpolate = 0;
}
VL = (ch->sample * ch-> left_vol_level) / 128;
VR = (ch->sample * ch->right_vol_level) / 128;
}
else
{
if (ch->interpolate)
{
int32_t s = (int32_t) ch->sample + ch->interpolate;
CLIP16(s);
ch->sample = (int16_t) s;
VL = (ch->sample * ch-> left_vol_level) / 128;
VR = (ch->sample * ch->right_vol_level) / 128;
}
}
if (pitch_mod & (1 << (J + 1)))
wave [I / 2] = ch->sample * ch->envx;
MixBuffer [I ] += VL;
MixBuffer [I + 1] += VR;
if (!ch->echo_buf_ptr)
continue;
ch->echo_buf_ptr [I ] += VL;
ch->echo_buf_ptr [I + 1] += VR;
}
stereo_exit:;
}
}
void S9xMixSamples(int16_t* buffer, int32_t sample_count)
{
int32_t J;
int32_t I;
if (SoundData.echo_enable)
memset(EchoBuffer, 0, sample_count * sizeof(EchoBuffer [0]));
memset(MixBuffer, 0, sample_count * sizeof(MixBuffer [0]));
MixStereo(sample_count);
/* Mix and convert waveforms */
if (SoundData.echo_enable && SoundData.echo_buffer_size)
{
// 16-bit stereo sound with echo enabled ...
if (FilterTapDefinitionBitfield == 0)
{
// ... but no filter defined.
for (J = 0; J < sample_count; J++)
{
int32_t E = Echo [SoundData.echo_ptr];
Echo[SoundData.echo_ptr++] = (E * SoundData.echo_feedback) / 128 + EchoBuffer [J];
if (SoundData.echo_ptr >= SoundData.echo_buffer_size)
SoundData.echo_ptr = 0;
I = (MixBuffer[J] * SoundData.master_volume [J & 1] + E * SoundData.echo_volume [J & 1]) / VOL_DIV16;
CLIP16(I);
buffer[J] = I;
}
}
else
{
// ... with filter defined.
for (J = 0; J < sample_count; J++)
{
Loop [(Z - 0) & 15] = Echo [SoundData.echo_ptr];
int32_t E = Loop [(Z - 0) & 15] * FilterTaps [0];
if (FilterTapDefinitionBitfield & 0x02) E += Loop [(Z - 2) & 15] * FilterTaps [1];
if (FilterTapDefinitionBitfield & 0x04) E += Loop [(Z - 4) & 15] * FilterTaps [2];
if (FilterTapDefinitionBitfield & 0x08) E += Loop [(Z - 6) & 15] * FilterTaps [3];
if (FilterTapDefinitionBitfield & 0x10) E += Loop [(Z - 8) & 15] * FilterTaps [4];
if (FilterTapDefinitionBitfield & 0x20) E += Loop [(Z - 10) & 15] * FilterTaps [5];
if (FilterTapDefinitionBitfield & 0x40) E += Loop [(Z - 12) & 15] * FilterTaps [6];
if (FilterTapDefinitionBitfield & 0x80) E += Loop [(Z - 14) & 15] * FilterTaps [7];
E /= 128;
Z++;
Echo[SoundData.echo_ptr++] = (E * SoundData.echo_feedback) / 128 + EchoBuffer[J];
if (SoundData.echo_ptr >= SoundData.echo_buffer_size)
SoundData.echo_ptr = 0;
I = (MixBuffer[J] * SoundData.master_volume [J & 1] + E * SoundData.echo_volume [J & 1]) / VOL_DIV16;
CLIP16(I);
buffer[J] = I;
}
}
}
else
{
// 16-bit mono or stereo sound, no echo
for (J = 0; J < sample_count; J++)
{
I = (MixBuffer[J] * SoundData.master_volume [J & 1]) / VOL_DIV16;
CLIP16(I);
buffer[J] = I;
}
}
}
void S9xResetSound(bool full)
{
int32_t i;
for (i = 0; i < 8; i++)
{
SoundData.channels[i].state = SOUND_SILENT;
SoundData.channels[i].mode = MODE_NONE;
SoundData.channels[i].type = SOUND_SAMPLE;
SoundData.channels[i].volume_left = 0;
SoundData.channels[i].volume_right = 0;
SoundData.channels[i].hertz = 0;
SoundData.channels[i].count = 0;
SoundData.channels[i].loop = false;
SoundData.channels[i].envx_target = 0;
SoundData.channels[i].env_error = 0;
SoundData.channels[i].erate = 0;
SoundData.channels[i].envx = 0;
SoundData.channels[i].envxx = 0;
SoundData.channels[i].left_vol_level = 0;
SoundData.channels[i].right_vol_level = 0;
SoundData.channels[i].direction = 0;
SoundData.channels[i].attack_rate = 0;
SoundData.channels[i].decay_rate = 0;
SoundData.channels[i].sustain_rate = 0;
SoundData.channels[i].release_rate = 0;
SoundData.channels[i].sustain_level = 0;
// notaz
SoundData.channels[i].env_ind_attack = 0;
SoundData.channels[i].env_ind_decay = 0;
SoundData.channels[i].env_ind_sustain = 0;
SoundData.echo_ptr = 0;
SoundData.echo_feedback = 0;
SoundData.echo_buffer_size = 1;
}
FilterTaps [0] = 127;
FilterTaps [1] = 0;
FilterTaps [2] = 0;
FilterTaps [3] = 0;
FilterTaps [4] = 0;
FilterTaps [5] = 0;
FilterTaps [6] = 0;
FilterTaps [7] = 0;
FilterTapDefinitionBitfield = 0;
so.noise_gen = 1;
if (full)
{
SoundData.echo_enable = 0;
SoundData.echo_write_enabled = 0;
SoundData.pitch_mod = 0;
SoundData.master_volume[0] = 0;
SoundData.master_volume[1] = 0;
SoundData.echo_volume[0] = 0;
SoundData.echo_volume[1] = 0;
SoundData.noise_hertz = 0;
}
SoundData.master_volume [0] = SoundData.master_volume [1] = 127;
so.mute_sound = true;
}
void S9xSetPlaybackRate(uint32_t playback_rate)
{
so.playback_rate = playback_rate;
if (playback_rate)
{
// notaz: calculate a value (let's call it freqbase) to simplify channel freq calculations later.
so.freqbase = (FIXED_POINT << 11) / (playback_rate * 33 / 32);
// now precalculate env rates for S9xSetEnvRate
static int32_t steps [] =
{
0, 64, 619, 619, 128, 1, 64, 55, 64, 619
};
int32_t i, u;
for (u = 0 ; u < 10 ; u++)
{
int64_t fp1000su = ((int64_t) FIXED_POINT * 1000 * steps[u]);
for (i = 0 ; i < 16 ; i++)
AttackERate[i][u] = (uint32_t) (fp1000su / (AttackRate[i] * playback_rate));
for (i = 0 ; i < 8 ; i++)
DecayERate[i][u] = (uint32_t) (fp1000su / (DecayRate[i] * playback_rate));
for (i = 0 ; i < 32 ; i++)
{
SustainERate[i][u] = (uint32_t) (fp1000su / (SustainRate[i] * playback_rate));
IncreaseERate[i][u] = (uint32_t) (fp1000su / (IncreaseRate[i] * playback_rate));
DecreaseERateExp[i][u] = (uint32_t) (fp1000su / (DecreaseRateExp[i] / 2 * playback_rate));
}
KeyOffERate[u] = (uint32_t) (fp1000su / (8 * playback_rate));
}
}
S9xSetEchoDelay(APU.DSP [APU_EDL] & 0xf);
int32_t i;
for (i = 0; i < 8; i++)
S9xSetSoundFrequency(i, SoundData.channels [i].hertz);
}
bool S9xInitSound()
{
so.playback_rate = 0;
S9xResetSound(true);
return true;
}
bool S9xSetSoundMode(int32_t channel, int32_t mode)
{
Channel* ch = &SoundData.channels[channel];
switch (mode)
{
case MODE_RELEASE:
if (ch->mode != MODE_NONE)
{
ch->mode = MODE_RELEASE;
return true;
}
break;
case MODE_DECREASE_LINEAR:
case MODE_DECREASE_EXPONENTIAL:
case MODE_GAIN:
case MODE_INCREASE_LINEAR:
case MODE_INCREASE_BENT_LINE:
if (ch->mode != MODE_RELEASE)
{
ch->mode = mode;
if (ch->state != SOUND_SILENT)
ch->state = mode;
return true;
}
break;
case MODE_ADSR:
if (ch->mode == MODE_NONE || ch->mode == MODE_ADSR)
{
ch->mode = mode;
return true;
}
}
return false;
}
void S9xPlaySample(int32_t channel)
{
Channel* ch = &SoundData.channels[channel];
ch->state = SOUND_SILENT;
ch->mode = MODE_NONE;
ch->envx = 0;
ch->envxx = 0;
S9xFixEnvelope(channel,
APU.DSP [APU_GAIN + (channel << 4)],
APU.DSP [APU_ADSR1 + (channel << 4)],
APU.DSP [APU_ADSR2 + (channel << 4)]);
ch->sample_number = APU.DSP [APU_SRCN + channel * 0x10];
if (APU.DSP [APU_NON] & (1 << channel))
ch->type = SOUND_NOISE;
else
ch->type = SOUND_SAMPLE;
S9xSetSoundFrequency(channel, ch->hertz);
ch->loop = false;
ch->needs_decode = true;
ch->last_block = false;
ch->previous [0] = ch->previous[1] = 0;
uint8_t* dir = S9xGetSampleAddress(ch->sample_number);
ch->block_pointer = READ_WORD(dir);
ch->sample_pointer = 0;
ch->env_error = 0;
ch->next_sample = 0;
ch->interpolate = 0;
switch (ch->mode)
{
case MODE_ADSR:
if (ch->attack_rate == 0)
{
if (ch->decay_rate == 0 || ch->sustain_level == 8)
{
ch->state = SOUND_SUSTAIN;
ch->envx = (MAX_ENVELOPE_HEIGHT * ch->sustain_level) >> 3;
S9xSetEnvRate(ch, ch->sustain_rate, -1, 0, 2 << 28);
}
else
{
ch->state = SOUND_DECAY;
ch->envx = MAX_ENVELOPE_HEIGHT;
S9xSetEnvRate(ch, ch->decay_rate, -1,
(MAX_ENVELOPE_HEIGHT * ch->sustain_level) >> 3, 1 << 28);
}
ch-> left_vol_level = (ch->envx * ch->volume_left) / 128;
ch->right_vol_level = (ch->envx * ch->volume_right) / 128;
}
else
{
ch->state = SOUND_ATTACK;
ch->envx = 0;
ch->left_vol_level = 0;
ch->right_vol_level = 0;
S9xSetEnvRate(ch, ch->attack_rate, 1, MAX_ENVELOPE_HEIGHT, 0);
}
ch->envxx = ch->envx << ENVX_SHIFT;
break;
case MODE_GAIN:
ch->state = SOUND_GAIN;
break;
case MODE_INCREASE_LINEAR:
ch->state = SOUND_INCREASE_LINEAR;
break;
case MODE_INCREASE_BENT_LINE:
ch->state = SOUND_INCREASE_BENT_LINE;
break;
case MODE_DECREASE_LINEAR:
ch->state = SOUND_DECREASE_LINEAR;
break;
case MODE_DECREASE_EXPONENTIAL:
ch->state = SOUND_DECREASE_EXPONENTIAL;
break;
default:
break;
}
S9xFixEnvelope(channel,
APU.DSP [APU_GAIN + (channel << 4)],
APU.DSP [APU_ADSR1 + (channel << 4)],
APU.DSP [APU_ADSR2 + (channel << 4)]);
}
#endif
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