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spc_player.c
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spc_player.c
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#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include "types.h"
#include "snes/spc.h"
#include "snes/dsp_regs.h"
#include "spc_player.h"
typedef struct MemMap {
uint16 off, org_off;
} MemMap;
typedef struct MemMapSized {
uint16 off, org_off, size;
} MemMapSized;
static const MemMap kChannel_Maps[] = {
{offsetof(Channel, pattern_order_ptr_for_chan), 0x8030},
{offsetof(Channel, note_ticks_left), 0x70},
{offsetof(Channel, note_keyoff_ticks_left), 0x71},
{offsetof(Channel, subroutine_num_loops), 0x80},
{offsetof(Channel, volume_fade_ticks), 0x90},
{offsetof(Channel, pan_num_ticks), 0x91},
{offsetof(Channel, pitch_slide_length), 0xa0},
{offsetof(Channel, pitch_slide_delay_left), 0xa1},
{offsetof(Channel, vibrato_hold_count), 0xb0},
{offsetof(Channel, vib_depth), 0xb1},
{offsetof(Channel, tremolo_hold_count), 0xc0},
{offsetof(Channel, tremolo_depth), 0xc1},
{offsetof(Channel, vibrato_change_count), 0x100},
{offsetof(Channel, note_length), 0x200},
{offsetof(Channel, note_gate_off_fixedpt), 0x201},
{offsetof(Channel, channel_volume_master), 0x210},
{offsetof(Channel, instrument_id), 0x211},
{offsetof(Channel, instrument_pitch_base), 0x8220},
{offsetof(Channel, saved_pattern_ptr), 0x8230},
{offsetof(Channel, pattern_start_ptr), 0x8240},
{offsetof(Channel, pitch_envelope_num_ticks), 0x280},
{offsetof(Channel, pitch_envelope_delay), 0x281},
{offsetof(Channel, pitch_envelope_direction), 0x290},
{offsetof(Channel, pitch_envelope_slide_value), 0x291},
{offsetof(Channel, vibrato_count), 0x2a0},
{offsetof(Channel, vibrato_rate), 0x2a1},
{offsetof(Channel, vibrato_delay_ticks), 0x2b0},
{offsetof(Channel, vibrato_fade_num_ticks), 0x2b1},
{offsetof(Channel, vibrato_fade_add_per_tick), 0x2c0},
{offsetof(Channel, vibrato_depth_target), 0x2c1},
{offsetof(Channel, tremolo_count), 0x2d0},
{offsetof(Channel, tremolo_rate), 0x2d1},
{offsetof(Channel, tremolo_delay_ticks), 0x2e0},
{offsetof(Channel, channel_transposition), 0x2f0},
{offsetof(Channel, channel_volume), 0x8300},
{offsetof(Channel, volume_fade_addpertick), 0x8310},
{offsetof(Channel, volume_fade_target), 0x320},
{offsetof(Channel, final_volume), 0x321},
{offsetof(Channel, pan_value), 0x8330},
{offsetof(Channel, pan_add_per_tick), 0x8340},
{offsetof(Channel, pan_target_value), 0x350},
{offsetof(Channel, pan_flag_with_phase_invert), 0x351},
{offsetof(Channel, pitch), 0x8360},
{offsetof(Channel, pitch_add_per_tick), 0x8370},
{offsetof(Channel, pitch_target), 0x380},
{offsetof(Channel, fine_tune), 0x381},
{offsetof(Channel, sfx_sound_ptr), 0x8390},
{offsetof(Channel, sfx_which_sound), 0x3a0},
{offsetof(Channel, sfx_arr_countdown), 0x3a1},
{offsetof(Channel, sfx_note_length_left), 0x3b0},
{offsetof(Channel, sfx_note_length), 0x3b1},
{offsetof(Channel, sfx_pan), 0x3d0},
};
static const MemMapSized kSpcPlayer_Maps[] = {
{offsetof(SpcPlayer, new_value_from_snes), 0x0, 4},
{offsetof(SpcPlayer, port_to_snes), 0x4, 4},
{offsetof(SpcPlayer, last_value_from_snes), 0x8, 4},
{offsetof(SpcPlayer, counter_sf0c), 0xc, 1},
{offsetof(SpcPlayer, _always_zero), 0xe, 2},
{offsetof(SpcPlayer, temp_accum), 0x10, 2},
{offsetof(SpcPlayer, ttt), 0x12, 1},
{offsetof(SpcPlayer, did_affect_volumepitch_flag), 0x13, 1},
{offsetof(SpcPlayer, addr0), 0x14, 2},
{offsetof(SpcPlayer, addr1), 0x16, 2},
{offsetof(SpcPlayer, lfsr_value), 0x18, 2},
{offsetof(SpcPlayer, is_chan_on), 0x1a, 1},
{offsetof(SpcPlayer, fast_forward), 0x1b, 1},
{offsetof(SpcPlayer, sfx_start_arg_pan), 0x20, 1},
{offsetof(SpcPlayer, sfx_sound_ptr_cur), 0x2c, 2},
{offsetof(SpcPlayer, music_ptr_toplevel), 0x40, 2},
{offsetof(SpcPlayer, block_count), 0x42, 1},
{offsetof(SpcPlayer, sfx_timer_accum), 0x43, 1},
{offsetof(SpcPlayer, chn), 0x44, 1},
{offsetof(SpcPlayer, key_ON), 0x45, 1},
{offsetof(SpcPlayer, key_OFF), 0x46, 1},
{offsetof(SpcPlayer, cur_chan_bit), 0x47, 1},
{offsetof(SpcPlayer, reg_FLG), 0x48, 1},
{offsetof(SpcPlayer, reg_NON), 0x49, 1},
{offsetof(SpcPlayer, reg_EON), 0x4a, 1},
{offsetof(SpcPlayer, reg_PMON), 0x4b, 1},
{offsetof(SpcPlayer, echo_stored_time), 0x4c, 1},
{offsetof(SpcPlayer, echo_parameter_EDL), 0x4d, 1},
{offsetof(SpcPlayer, reg_EFB), 0x4e, 1},
{offsetof(SpcPlayer, global_transposition), 0x50, 1},
{offsetof(SpcPlayer, main_tempo_accum), 0x51, 1},
{offsetof(SpcPlayer, tempo), 0x52, 2},
{offsetof(SpcPlayer, tempo_fade_num_ticks), 0x54, 1},
{offsetof(SpcPlayer, tempo_fade_final), 0x55, 1},
{offsetof(SpcPlayer, tempo_fade_add), 0x56, 2},
{offsetof(SpcPlayer, master_volume), 0x58, 2},
{offsetof(SpcPlayer, master_volume_fade_ticks), 0x5a, 1},
{offsetof(SpcPlayer, master_volume_fade_target), 0x5b, 1},
{offsetof(SpcPlayer, master_volume_fade_add_per_tick), 0x5c, 2},
{offsetof(SpcPlayer, vol_dirty), 0x5e, 1},
{offsetof(SpcPlayer, percussion_base_id), 0x5f, 1},
{offsetof(SpcPlayer, echo_volume_left), 0x60, 2},
{offsetof(SpcPlayer, echo_volume_right), 0x62, 2},
{offsetof(SpcPlayer, echo_volume_fade_add_left), 0x64, 2},
{offsetof(SpcPlayer, echo_volume_fade_add_right), 0x66, 2},
{offsetof(SpcPlayer, echo_volume_fade_ticks), 0x68, 1},
{offsetof(SpcPlayer, echo_volume_fade_target_left), 0x69, 1},
{offsetof(SpcPlayer, echo_volume_fade_target_right), 0x6a, 1},
{offsetof(SpcPlayer, sfx_channel_index), 0x3c0, 1},
{offsetof(SpcPlayer, current_bit), 0x3c1, 1},
{offsetof(SpcPlayer, dsp_register_index), 0x3c2, 1},
{offsetof(SpcPlayer, echo_channels), 0x3c3, 1},
{offsetof(SpcPlayer, byte_3C4), 0x3c4, 1},
{offsetof(SpcPlayer, byte_3C5), 0x3c5, 1},
{offsetof(SpcPlayer, echo_fract_incr), 0x3c7, 1},
{offsetof(SpcPlayer, sfx_channel_index2), 0x3c8, 1},
{offsetof(SpcPlayer, sfx_channel_bit), 0x3c9, 1},
{offsetof(SpcPlayer, pause_music_ctr), 0x3ca, 1},
{offsetof(SpcPlayer, port2_active), 0x3cb, 1},
{offsetof(SpcPlayer, port2_current_bit), 0x3cc, 1},
{offsetof(SpcPlayer, port3_active), 0x3cd, 1},
{offsetof(SpcPlayer, port3_current_bit), 0x3ce, 1},
{offsetof(SpcPlayer, port1_active), 0x3cf, 1},
{offsetof(SpcPlayer, port1_current_bit), 0x3e0, 1},
{offsetof(SpcPlayer, byte_3E1), 0x3e1, 1},
{offsetof(SpcPlayer, sfx_play_echo_flag), 0x3e2, 1},
{offsetof(SpcPlayer, sfx_channels_echo_mask2), 0x3e3, 1},
{offsetof(SpcPlayer, port1_counter), 0x3e4, 1},
{offsetof(SpcPlayer, channel_67_volume), 0x3e5, 1},
{offsetof(SpcPlayer, cutk_always_zero), 0x3ff, 1},
};
static void PlayNote(SpcPlayer *p, Channel *c, uint8 note);
static void Dsp_Write(SpcPlayer *p, uint8_t reg, uint8 value) {
DspRegWriteHistory *hist = p->reg_write_history;
if (hist) {
if (hist->count < 256) {
hist->addr[hist->count] = reg;
hist->val[hist->count] = value;
hist->count++;
}
}
if (p->dsp)
dsp_write(p->dsp, reg, value);
}
static void Not_Implemented() {
assert(0);
printf("Not Implemented\n");
}
static uint16 SpcDivHelper(int a, uint8 b) {
int org_a = a;
if (a & 0x100)
a = -a;
int q = b ? (a & 0xff) / b : 0xff;
int r = b ? (a & 0xff) % b : (a & 0xff);
int t = (q << 8) + (b ? ((r << 8) / b & 0xff) : 0xff);
return (org_a & 0x100) ? -t : t;
}
static inline void Chan_DoAnyFade(uint16 *p, uint16 add, uint8 target, uint8 cont) {
if (!cont)
*p = target << 8;
else
*p += add;
}
static void SetupEchoParameter_EDL(SpcPlayer *p, uint8 a) {
p->echo_parameter_EDL = a;
if (a != p->last_written_edl) {
a = (p->last_written_edl & 0xf) ^ 0xff;
if (p->echo_stored_time & 0x80)
a += p->echo_stored_time;
p->echo_stored_time = a;
Dsp_Write(p, EON, 0);
Dsp_Write(p, EFB, 0);
Dsp_Write(p, EVOLR, 0);
Dsp_Write(p, EVOLL, 0);
Dsp_Write(p, FLG, p->reg_FLG | 0x20);
p->last_written_edl = p->echo_parameter_EDL;
Dsp_Write(p, EDL, p->echo_parameter_EDL);
}
Dsp_Write(p, ESA, (p->echo_parameter_EDL * 8 ^ 0xff) + 0xd1);
}
static void WriteVolumeToDsp(SpcPlayer *p, Channel *c, uint16 volume) {
static const uint8 kVolumeTable[22] = {0, 1, 3, 7, 13, 21, 30, 41, 52, 66, 81, 94, 103, 110, 115, 119, 122, 124, 125, 126, 127, 127};
if (p->is_chan_on & p->cur_chan_bit)
return;
for (int i = 0; i < 2; i++) {
int j = volume >> 8;
uint8 t;
if (j >= 21) {
t = p->ram[j + 0x1178] + ((p->ram[j + 0x1179] - p->ram[j + 0x1178]) * (uint8)volume >> 8);
} else {
t = kVolumeTable[j] + ((kVolumeTable[j + 1] - kVolumeTable[j]) * (uint8)volume >> 8);
}
t = t * c->final_volume >> 8;
if ((c->pan_flag_with_phase_invert << i) & 0x80)
t = -t;
Dsp_Write(p, V0VOLL + i + c->index * 16, t);
volume = 0x1400 - volume;
}
}
static void WritePitch(SpcPlayer *p, Channel *c, uint16 pitch) {
static const uint16 kBaseNoteFreqs[13] = {2143, 2270, 2405, 2548, 2700, 2860, 3030, 3211, 3402, 3604, 3818, 4045, 4286};
if ((pitch >> 8) >= 0x34) {
pitch += (pitch >> 8) - 0x34;
} else if ((pitch >> 8) < 0x13) {
pitch += (uint8)(((pitch >> 8) - 0x13) * 2) - 256;
}
uint8 pp = (pitch >> 8) & 0x7f;
uint8 q = pp / 12, r = pp % 12;
uint16 t = kBaseNoteFreqs[r] + ((uint8)(kBaseNoteFreqs[r + 1] - kBaseNoteFreqs[r]) * (uint8)pitch >> 8);
t *= 2;
while (q != 6)
t >>= 1, q++;
t = c->instrument_pitch_base * t >> 8;
if (!(p->cur_chan_bit & p->is_chan_on)) {
uint8 reg = c->index * 16;
Dsp_Write(p, reg + V0PITCHL, t & 0xff);
Dsp_Write(p, reg + V0PITCHH, t >> 8);
}
}
static void Music_ResetChan(SpcPlayer *p) {
Channel *c = &p->channel[7];
p->cur_chan_bit = 0x80;
do {
HIBYTE(c->channel_volume) = 0xff;
c->pan_flag_with_phase_invert = 10;
c->pan_value = 10 << 8;
c->instrument_id = 0;
c->fine_tune = 0;
c->channel_transposition = 0;
c->pitch_envelope_num_ticks = 0;
c->vib_depth = 0;
c->tremolo_depth = 0;
} while (c--, p->cur_chan_bit >>= 1);
p->master_volume_fade_ticks = 0;
p->echo_volume_fade_ticks = 0;
p->tempo_fade_num_ticks = 0;
p->global_transposition = 0;
p->block_count = 0;
p->percussion_base_id = 0;
HIBYTE(p->master_volume) = 0xc0;
HIBYTE(p->tempo) = 0x20;
}
static void Channel_SetInstrument(SpcPlayer *p, Channel *c, uint8 instrument) {
c->instrument_id = instrument;
if (instrument & 0x80)
instrument = instrument + 54 + p->percussion_base_id;
const uint8 *ip = p->ram + instrument * 6 + 0x3d00;
if (p->is_chan_on & p->cur_chan_bit)
return;
uint8 reg = c->index * 16;
if (ip[0] & 0x80) {
// noise
p->reg_FLG = (p->reg_FLG & 0x20) | ip[0] & 0x1f;
p->reg_NON |= p->cur_chan_bit;
Dsp_Write(p, reg + V0SRCN, 0);
} else {
Dsp_Write(p, reg + V0SRCN, ip[0]);
}
Dsp_Write(p, reg + V0ADSR1, ip[1]);
Dsp_Write(p, reg + V0ADSR2, ip[2]);
Dsp_Write(p, reg + V0GAIN, ip[3]);
c->instrument_pitch_base = ip[4] << 8 | ip[5];
}
static void ComputePitchAdd(Channel *c, uint8 pitch) {
c->pitch_target = pitch & 0x7f;
c->pitch_add_per_tick = SpcDivHelper(c->pitch_target - (c->pitch >> 8), c->pitch_slide_length);
}
static void PitchSlideToNote_Check(SpcPlayer *p, Channel *c) {
if (c->pitch_slide_length || p->ram[c->pattern_order_ptr_for_chan] != 0xf9)
return;
if (p->cur_chan_bit & p->is_chan_on) {
c->pattern_order_ptr_for_chan += 4;
return;
}
c->pattern_order_ptr_for_chan++;
c->pitch_slide_delay_left = p->ram[c->pattern_order_ptr_for_chan++];
c->pitch_slide_length = p->ram[c->pattern_order_ptr_for_chan++];
ComputePitchAdd(c, p->ram[c->pattern_order_ptr_for_chan++] + p->global_transposition + c->channel_transposition);
}
static const uint8 kEffectByteLength[27] = {1, 1, 2, 3, 0, 1, 2, 1, 2, 1, 1, 3, 0, 1, 2, 3, 1, 3, 3, 0, 1, 3, 0, 3, 3, 3, 1};
static void HandleEffect(SpcPlayer *p, Channel *c, uint8 effect) {
uint8 arg = kEffectByteLength[effect - 0xe0] ? p->ram[c->pattern_order_ptr_for_chan++] : 0;
switch (effect) {
case 0xe0:
Channel_SetInstrument(p, c, arg);
break;
case 0xe1:
c->pan_flag_with_phase_invert = arg;
c->pan_value = (arg & 0x1f) << 8;
break;
case 0xe2:
c->pan_num_ticks = arg;
c->pan_target_value = p->ram[c->pattern_order_ptr_for_chan++];
c->pan_add_per_tick = SpcDivHelper(c->pan_target_value - (c->pan_value >> 8), arg);
break;
case 0xe3: // vibrato on
c->vibrato_delay_ticks = arg;
c->vibrato_rate = p->ram[c->pattern_order_ptr_for_chan++];
c->vibrato_depth_target = c->vib_depth = p->ram[c->pattern_order_ptr_for_chan++];
c->vibrato_fade_num_ticks = 0;
break;
case 0xe4: // vibrato off
c->vibrato_depth_target = c->vib_depth = 0;
c->vibrato_fade_num_ticks = 0;
break;
case 0xe5:
if (!p->pause_music_ctr && !p->byte_3E1)
p->master_volume = arg << 8;
break;
case 0xe6:
p->master_volume_fade_ticks = arg;
p->master_volume_fade_target = p->ram[c->pattern_order_ptr_for_chan++];
p->master_volume_fade_add_per_tick = SpcDivHelper(p->master_volume_fade_target - (p->master_volume >> 8), arg);
break;
case 0xe7:
p->tempo = arg << 8;
break;
case 0xe8:
p->tempo_fade_num_ticks = arg;
p->tempo_fade_final = p->ram[c->pattern_order_ptr_for_chan++];
p->tempo_fade_add = SpcDivHelper(p->tempo_fade_final - (p->tempo >> 8), arg);
break;
case 0xe9:
p->global_transposition = arg;
break;
case 0xea:
c->channel_transposition = arg;
break;
case 0xeb:
c->tremolo_delay_ticks = arg;
c->tremolo_rate = p->ram[c->pattern_order_ptr_for_chan++];
c->tremolo_depth = p->ram[c->pattern_order_ptr_for_chan++];
break;
case 0xec:
c->tremolo_depth = 0;
break;
case 0xed:
c->channel_volume = arg << 8;
break;
case 0xee:
c->volume_fade_ticks = arg;
c->volume_fade_target = p->ram[c->pattern_order_ptr_for_chan++];
c->volume_fade_addpertick = SpcDivHelper(c->volume_fade_target - (c->channel_volume >> 8), arg);
break;
case 0xef:
c->pattern_start_ptr = p->ram[c->pattern_order_ptr_for_chan++] << 8 | arg;
c->subroutine_num_loops = p->ram[c->pattern_order_ptr_for_chan++];
c->saved_pattern_ptr = c->pattern_order_ptr_for_chan;
c->pattern_order_ptr_for_chan = c->pattern_start_ptr;
break;
case 0xf0:
c->vibrato_fade_num_ticks = arg;
c->vibrato_fade_add_per_tick = arg ? c->vib_depth / arg : 0xff;
break;
case 0xf4:
c->fine_tune = arg;
break;
case 0xf5:
p->reg_EON = p->echo_channels = arg;
p->echo_volume_left = p->ram[c->pattern_order_ptr_for_chan++] << 8;
p->echo_volume_right = p->ram[c->pattern_order_ptr_for_chan++] << 8;
p->reg_FLG &= ~0x20;
break;
case 0xf6: // echo off
p->echo_volume_left = 0;
p->echo_volume_right = 0;
p->reg_FLG |= 0x20;
break;
case 0xf7: {
static const int8_t kEchoFirParameters[] = {
127, 0, 0, 0, 0, 0, 0, 0,
88, -65, -37, -16, -2, 7, 12, 12,
12, 33, 43, 43, 19, -2, -13, -7,
52, 51, 0, -39, -27, 1, -4, -21,
};
SetupEchoParameter_EDL(p, arg);
p->reg_EFB = p->ram[c->pattern_order_ptr_for_chan++];
const int8_t *ep = kEchoFirParameters + p->ram[c->pattern_order_ptr_for_chan++] * 8;
for (int i = 0; i < 8; i++)
Dsp_Write(p, FIR0 + i * 16, *ep++);
break;
}
case 0xf8:
p->echo_volume_fade_ticks = arg;
p->echo_volume_fade_target_left = p->ram[c->pattern_order_ptr_for_chan++];
p->echo_volume_fade_target_right = p->ram[c->pattern_order_ptr_for_chan++];
p->echo_volume_fade_add_left = SpcDivHelper(p->echo_volume_fade_target_left - (p->echo_volume_left >> 8), arg);
p->echo_volume_fade_add_right = SpcDivHelper(p->echo_volume_fade_target_right - (p->echo_volume_right >> 8), arg);
break;
case 0xf9:
c->pitch_slide_delay_left = arg;
c->pitch_slide_length = p->ram[c->pattern_order_ptr_for_chan++];
ComputePitchAdd(c, p->ram[c->pattern_order_ptr_for_chan++] + p->global_transposition + c->channel_transposition);
break;
case 0xfa:
p->percussion_base_id = arg;
break;
default:
Not_Implemented();
}
}
static bool WantWriteKof(SpcPlayer *p, Channel *c) {
int loops = c->subroutine_num_loops;
int ptr = c->pattern_order_ptr_for_chan;
for (;;) {
uint8 cmd = p->ram[ptr++];
if (cmd == 0) {
if (loops == 0)
return true;
ptr = (--loops == 0) ? c->saved_pattern_ptr : c->pattern_start_ptr;
} else {
while (!(cmd & 0x80))
cmd = p->ram[ptr++];
if (cmd == 0xc8)
return false;
if (cmd == 0xef) {
ptr = p->ram[ptr + 0] | p->ram[ptr + 1] << 8;
} else if (cmd >= 0xe0) {
ptr += kEffectByteLength[cmd - 0xe0];
} else {
return true;
}
}
}
}
static void HandleTremolo(SpcPlayer *p, Channel *c) {
Not_Implemented();
}
static void CalcVibratoAddPitch(SpcPlayer *p, Channel *c, uint16 pitch, uint8 value) {
int t = value << 2;
t ^= (t & 0x100) ? 0xff : 0;
int r = (c->vib_depth >= 0xf1) ?
(uint8)t * (c->vib_depth & 0xf) :
(uint8)t * c->vib_depth >> 8;
WritePitch(p, c, pitch + (value & 0x80 ? -r : r));
}
static void HandlePanAndSweep(SpcPlayer *p, Channel *c) {
p->did_affect_volumepitch_flag = 0;
if (c->tremolo_depth) {
c->tremolo_hold_count = c->tremolo_delay_ticks;
HandleTremolo(p, c);
}
uint16 volume = c->pan_value;
if (c->pan_num_ticks) {
p->did_affect_volumepitch_flag = 0x80;
volume += p->main_tempo_accum * (int16_t)c->pan_add_per_tick / 256;
}
if (p->did_affect_volumepitch_flag)
WriteVolumeToDsp(p, c, volume);
p->did_affect_volumepitch_flag = 0;
uint16 pitch = c->pitch;
if (c->pitch_slide_length && !c->pitch_slide_delay_left) {
p->did_affect_volumepitch_flag |= 0x80;
pitch += p->main_tempo_accum * (int16_t)c->pitch_add_per_tick / 256;
}
if (c->vib_depth && c->vibrato_delay_ticks == c->vibrato_hold_count) {
CalcVibratoAddPitch(p, c, pitch, (p->main_tempo_accum * c->vibrato_rate >> 8) + c->vibrato_count);
return;
}
if (p->did_affect_volumepitch_flag)
WritePitch(p, c, pitch);
}
static void HandleNoteTick(SpcPlayer *p, Channel *c) {
if (c->note_keyoff_ticks_left != 0 && (--c->note_keyoff_ticks_left == 0 || c->note_ticks_left == 2)) {
if (WantWriteKof(p, c) && !(p->cur_chan_bit & p->is_chan_on))
Dsp_Write(p, KOF, p->cur_chan_bit);
}
p->did_affect_volumepitch_flag = 0;
if (c->pitch_slide_length) {
if (c->pitch_slide_delay_left) {
c->pitch_slide_delay_left--;
} else if (!(p->is_chan_on & p->cur_chan_bit)) {
p->did_affect_volumepitch_flag = 0x80;
Chan_DoAnyFade(&c->pitch, c->pitch_add_per_tick, c->pitch_target, --c->pitch_slide_length);
}
}
uint16 pitch = c->pitch;
if (c->vib_depth) {
if (c->vibrato_delay_ticks == c->vibrato_hold_count) {
if (c->vibrato_change_count == c->vibrato_fade_num_ticks) {
c->vib_depth = c->vibrato_depth_target;
} else {
c->vib_depth = (c->vibrato_change_count++ == 0 ? 0 : c->vib_depth) + c->vibrato_fade_add_per_tick;
}
c->vibrato_count += c->vibrato_rate;
CalcVibratoAddPitch(p, c, pitch, c->vibrato_count);
return;
}
c->vibrato_hold_count++;
}
if (p->did_affect_volumepitch_flag)
WritePitch(p, c, pitch);
}
void CalcFinalVolume(SpcPlayer *p, Channel *c, uint8 vol) {
int t = (p->master_volume >> 8) * vol >> 8;
t = t * c->channel_volume_master >> 8;
t = t * (c->channel_volume >> 8) >> 8;
c->final_volume = t * t >> 8;
}
void CalcTremolo(SpcPlayer *p, Channel *c) {
Not_Implemented();
}
static void Chan_HandleTick(SpcPlayer *p, Channel *c) {
if (c->volume_fade_ticks) {
c->volume_fade_ticks--;
p->vol_dirty |= p->cur_chan_bit;
Chan_DoAnyFade(&c->channel_volume, c->volume_fade_addpertick, c->volume_fade_target, true);
}
if (c->tremolo_depth) {
if (c->tremolo_delay_ticks == c->tremolo_hold_count) {
p->vol_dirty |= p->cur_chan_bit;
if (c->tremolo_count & 0x80 && c->tremolo_depth == 0xff) {
c->tremolo_count = 0x80;
} else {
c->tremolo_count += c->tremolo_rate;
}
CalcTremolo(p, c);
} else {
c->tremolo_hold_count++;
CalcFinalVolume(p, c, 0xff);
}
} else {
CalcFinalVolume(p, c, 0xff);
}
if (c->pan_num_ticks) {
c->pan_num_ticks--;
p->vol_dirty |= p->cur_chan_bit;
Chan_DoAnyFade(&c->pan_value, c->pan_add_per_tick, c->pan_target_value, true);
}
if (p->vol_dirty & p->cur_chan_bit)
WriteVolumeToDsp(p, c, c->pan_value);
}
static void Port0_HandleMusic(SpcPlayer *p) {
Channel *c;
uint8 a = p->new_value_from_snes[0];
int t;
if (a == 0) {
handle_cmd_00:
if (p->port_to_snes[0] == 0)
return;
if (p->pause_music_ctr != 0 && --p->pause_music_ctr == 0)
goto HandleCmd_0xf0_PauseMusic;
if (p->counter_sf0c == 0)
goto label_a;
if (--p->counter_sf0c != 0) {
Music_ResetChan(p);
return;
}
next_phrase:
for (;;) {
t = WORD(p->ram[p->music_ptr_toplevel]);
p->music_ptr_toplevel += 2;
if ((t >> 8) != 0)
break;
if (t == 0)
goto HandleCmd_0xf0_PauseMusic;
if (t == 0x80) {
p->fast_forward = 0x80;
} else if (t == 0x81) {
p->fast_forward = 0;
} else {
if (sign8(--p->block_count))
p->block_count = t;
t = WORD(p->ram[p->music_ptr_toplevel]);
p->music_ptr_toplevel += 2;
if (p->block_count != 0)
p->music_ptr_toplevel = t;
}
}
for (int i = 0; i < 8; i++)
p->channel[i].pattern_order_ptr_for_chan = WORD(p->ram[t]), t += 2;
c = p->channel, p->cur_chan_bit = 1;
do {
if (HIBYTE(c->pattern_order_ptr_for_chan) && c->instrument_id == 0)
Channel_SetInstrument(p, c, 0);
c->subroutine_num_loops = 0;
c->volume_fade_ticks = 0;
c->pan_num_ticks = 0;
c->note_ticks_left = 1;
} while (c++, p->cur_chan_bit <<= 1);
label_a:
p->vol_dirty = 0;
c = p->channel, p->cur_chan_bit = 1;
do {
if (!HIBYTE(c->pattern_order_ptr_for_chan))
continue;
if (!--c->note_ticks_left) {
for (;;) {
uint8 cmd = p->ram[c->pattern_order_ptr_for_chan++];
if (cmd == 0) {
if (!c->subroutine_num_loops)
goto next_phrase;
c->pattern_order_ptr_for_chan = (--c->subroutine_num_loops == 0) ? c->saved_pattern_ptr : c->pattern_start_ptr;
continue;
}
if (!(cmd & 0x80)) {
static const uint8 kNoteVol[16] = { 25, 50, 76, 101, 114, 127, 140, 152, 165, 178, 191, 203, 216, 229, 242, 252 };
static const uint8 kNoteGateOffPct[8] = { 50, 101, 127, 152, 178, 203, 229, 252 };
c->note_length = cmd;
cmd = p->ram[c->pattern_order_ptr_for_chan++];
if (!(cmd & 0x80)) {
c->note_gate_off_fixedpt = kNoteGateOffPct[cmd >> 4 & 7];
c->channel_volume_master = kNoteVol[cmd & 0xf];
cmd = p->ram[c->pattern_order_ptr_for_chan++];
}
}
if (cmd >= 0xe0) {
HandleEffect(p, c, cmd);
continue;
}
if (!p->fast_forward && !(p->is_chan_on & p->cur_chan_bit))
PlayNote(p, c, cmd);
c->note_ticks_left = c->note_length;
t = c->note_ticks_left * c->note_gate_off_fixedpt >> 8;
c->note_keyoff_ticks_left = (t != 0) ? t : 1;
PitchSlideToNote_Check(p, c);
break;
}
} else if (!p->fast_forward) {
HandleNoteTick(p, c);
PitchSlideToNote_Check(p, c);
}
} while (c++, p->cur_chan_bit <<= 1);
if (p->tempo_fade_num_ticks)
p->tempo = (--p->tempo_fade_num_ticks == 0) ? p->tempo_fade_final << 8 : p->tempo + p->tempo_fade_add;
if (p->echo_volume_fade_ticks) {
p->echo_volume_left += p->echo_volume_fade_add_left;
p->echo_volume_right += p->echo_volume_fade_add_right;
if (--p->echo_volume_fade_ticks == 0) {
p->echo_volume_left = p->echo_volume_fade_target_left << 8;
p->echo_volume_right = p->echo_volume_fade_target_right << 8;
}
}
if (p->master_volume_fade_ticks) {
p->master_volume = (--p->master_volume_fade_ticks == 0) ? p->master_volume_fade_target << 8 : p->master_volume + p->master_volume_fade_add_per_tick;
p->vol_dirty = 0xff;
}
c = p->channel, p->cur_chan_bit = 1;
do {
if (HIBYTE(c->pattern_order_ptr_for_chan))
Chan_HandleTick(p, c);
} while (c++, p->cur_chan_bit <<= 1);
} else if (a == 0xff) {
// Load new music
Not_Implemented();
} else if (a == 0xf1) { // continue music
p->master_volume_fade_ticks = 0x80;
p->pause_music_ctr = 0x80;
p->master_volume_fade_target = 0;
p->master_volume_fade_add_per_tick = SpcDivHelper(0 - (p->master_volume >> 8), 0x80);
goto handle_cmd_00;
} else if (a == 0xf2) {
if (p->byte_3E1 != 0)
return;
p->byte_3E1 = HIBYTE(p->master_volume);
HIBYTE(p->master_volume) = 0x70;
goto handle_cmd_00;
} else if (a == 0xf3) {
if (p->byte_3E1 == 0)
return;
HIBYTE(p->master_volume) = p->byte_3E1;
p->byte_3E1 = 0;
goto handle_cmd_00;
} else if (a == 0xf0) HandleCmd_0xf0_PauseMusic: {
p->key_OFF = p->is_chan_on ^ 0xff;
p->port_to_snes[0] = 0;
p->cur_chan_bit = 0;
} else {
p->pause_music_ctr = 0;
p->byte_3E1 = 0;
p->port_to_snes[0] = a;
p->music_ptr_toplevel = WORD(p->ram[0xD000 + (a - 1) * 2]);
p->counter_sf0c = 2;
p->key_OFF |= p->is_chan_on ^ 0xff;
}
}
static inline uint8 Asl(uint8 *p) {
uint8 old = *p;
*p <<= 1;
return old >> 7;
}
static void Sfx_TurnOffChannel(SpcPlayer *p, Channel *c) {
c->sfx_which_sound = 0;
p->is_chan_on &= ~p->current_bit;
p->port1_active &= ~p->current_bit;
p->port2_active &= ~p->current_bit;
p->port3_active &= ~p->current_bit;
Channel_SetInstrument(p, c, c->instrument_id);
if (p->echo_channels & p->current_bit && !(p->reg_EON & p->current_bit)) {
p->reg_EON |= p->current_bit;
Dsp_Write(p, EON, p->reg_EON);
p->sfx_channels_echo_mask2 &= ~p->current_bit;
}
}
static void Write_KeyOn(SpcPlayer *p, uint8 bit) {
Dsp_Write(p, KOF, 0);
Dsp_Write(p, KON, bit);
}
static void PlayNote(SpcPlayer *p, Channel *c, uint8 note) {
if (note >= 0xca) {
Channel_SetInstrument(p, c, note);
note = 0xa4;
}
// if (c->index == 0) {
// if (note == 0xc8) {
// printf("-+-\n");
// } else if (note == 0xc9) {
// printf("---\n");
// }
// }
if (note >= 0xc8 || p->is_chan_on & p->cur_chan_bit)
return;
//static const char *const kNoteNames[] = { "C-", "C#", "D-", "D#", "E-", "F-", "F#", "G-", "G#", "A-", "A#", "B-" };
//if (c->index==0)
// printf("%s%d\n", kNoteNames[(note & 0x7f) % 12], (note & 0x7f) / 12 + 1);
c->pitch = ((note & 0x7f) + p->global_transposition + c->channel_transposition) << 8 | c->fine_tune;
c->vibrato_count = c->vibrato_fade_num_ticks << 7;
c->vibrato_hold_count = 0;
c->vibrato_change_count = 0;
c->tremolo_count = 0;
c->tremolo_hold_count = 0;
p->vol_dirty |= p->cur_chan_bit;
p->key_ON |= p->cur_chan_bit;
c->pitch_slide_length = c->pitch_envelope_num_ticks;
if (c->pitch_slide_length) {
c->pitch_slide_delay_left = c->pitch_envelope_delay;
if (!c->pitch_envelope_direction)
c->pitch -= c->pitch_envelope_slide_value << 8;
ComputePitchAdd(c, (c->pitch >> 8) + c->pitch_envelope_slide_value);
}
WritePitch(p, c, c->pitch);
}
static void Sfx_MaybeDisableEcho(SpcPlayer *p) {
if (!(p->port_to_snes[0] & 0x10) || p->current_bit & p->sfx_channels_echo_mask2) {
if (p->current_bit & p->reg_EON) {
p->reg_EON ^= p->current_bit;
Dsp_Write(p, EON, p->reg_EON);
}
}
}
static void Sfx_ChannelTick(SpcPlayer *p, Channel *c, bool is_continue) {
uint8 cmd;
if (is_continue) {
Sfx_MaybeDisableEcho(p);
p->sfx_channel_index = c->index * 2;
p->sfx_sound_ptr_cur = c->sfx_sound_ptr;
if (--c->sfx_note_length_left)
goto note_continue;
p->sfx_sound_ptr_cur++;
}
for (;;) {
p->dsp_register_index = p->sfx_channel_index * 8;
cmd = p->ram[p->sfx_sound_ptr_cur];
if (cmd == 0) {
Sfx_TurnOffChannel(p, c);
return;
}
if (!(cmd & 0x80)) {
c->sfx_note_length = cmd;
cmd = p->ram[++p->sfx_sound_ptr_cur];
if (!(cmd & 0x80)) {
if (p->port1_active & p->current_bit) {
if (cmd == 0 || !p->channel_67_volume) {
uint8 volume = cmd;
Dsp_Write(p, p->dsp_register_index + V0VOLL, cmd);
cmd = p->ram[++p->sfx_sound_ptr_cur];
if (cmd & 0x80) {
Dsp_Write(p, p->dsp_register_index + V0VOLR, volume);
} else {
Dsp_Write(p, p->dsp_register_index + V0VOLR, cmd);
cmd = p->ram[++p->sfx_sound_ptr_cur];
}
} else {
cmd = p->ram[++p->sfx_sound_ptr_cur];
}
} else {
c->final_volume = cmd * 2;
c->pan_flag_with_phase_invert = 10;
WriteVolumeToDsp(p, c, (p->sfx_start_arg_pan & 0x80 ? 16 : p->sfx_start_arg_pan & 0x40 ? 4 : 10) << 8);
cmd = p->ram[++p->sfx_sound_ptr_cur];
}
}
}
// cmd_parsed
if (cmd == 0xe0) {
const uint8 *ip = p->ram + 0x3E00 + (p->ram[++p->sfx_sound_ptr_cur] * 9);
uint8 reg = c->index * 16;
Dsp_Write(p, reg + V0VOLL, ip[0]);
Dsp_Write(p, reg + V0VOLR, ip[1]);
Dsp_Write(p, reg + V0PITCHL, ip[2]);
Dsp_Write(p, reg + V0PITCHH, ip[3]);
Dsp_Write(p, reg + V0SRCN, ip[4]);
Dsp_Write(p, reg + V0ADSR1, ip[5]);
Dsp_Write(p, reg + V0ADSR2, ip[6]);
Dsp_Write(p, reg + V0GAIN, ip[7]);
c->instrument_pitch_base = ip[8] << 8;
p->sfx_sound_ptr_cur++;
} else if (cmd == 0xf9 || cmd == 0xf1) {
if (cmd == 0xf9) {
PlayNote(p, c, p->ram[++p->sfx_sound_ptr_cur]);
Write_KeyOn(p, p->current_bit);
}
c->pitch_slide_delay_left = p->ram[++p->sfx_sound_ptr_cur];
c->pitch_slide_length = p->ram[++p->sfx_sound_ptr_cur];
ComputePitchAdd(c, p->ram[++p->sfx_sound_ptr_cur]);
c->sfx_note_length_left = c->sfx_note_length;
goto note_continue;
} else if (cmd == 0xff) {
p->sfx_sound_ptr_cur = c->sfx_sound_ptr = WORD(p->ram[0x17C0 + (c->sfx_which_sound - 1) * 2]);
} else {
PlayNote(p, c, cmd);
Write_KeyOn(p, p->current_bit);
c->sfx_note_length_left = c->sfx_note_length;
note_continue:
p->did_affect_volumepitch_flag = 0;
if (c->pitch_slide_length) {
p->did_affect_volumepitch_flag = 0x80;
Chan_DoAnyFade(&c->pitch, c->pitch_add_per_tick, c->pitch_target, --c->pitch_slide_length);
p->cur_chan_bit = 0; // force change through
WritePitch(p, c, c->pitch);
} else if (c->sfx_note_length_left == 2) {
Dsp_Write(p, KOF, p->current_bit);
}
break;
}
}
c->sfx_sound_ptr = p->sfx_sound_ptr_cur;
}
static void Port1_Play_Inner(SpcPlayer *p) {
p->port1_counter = 0;
Channel *c = &p->channel[7];
c->sfx_which_sound = p->new_value_from_snes[1];
c->sfx_arr_countdown = 3;
c->pitch_envelope_num_ticks = 0;
p->port1_active = 0x80;
p->is_chan_on |= 0x80;
Dsp_Write(p, KOF, 0x80);
p->new_value_from_snes[1] = p->ram[0x1800 + p->new_value_from_snes[1] - 1];
if (!p->new_value_from_snes[1])
return;
c--;
c->sfx_which_sound = p->new_value_from_snes[1];
c->sfx_arr_countdown = 3;
c->pitch_envelope_num_ticks = 0;
p->port1_active = 0x40;
p->is_chan_on |= 0x40;
Dsp_Write(p, KOF, 0x40);
p->port1_active = 0xc0;
p->sfx_channels_echo_mask2 |= 0xc0;
p->port2_active &= 0x3f;
p->port3_active &= 0x3f;
}
static void Port1_StartNewSound(SpcPlayer *p) {
if (p->port1_counter != 0) {
if (--p->port1_counter == 0) {
p->new_value_from_snes[1] = 5;
Port1_Play_Inner(p);
p->new_value_from_snes[1] = 0;
return;
}
p->channel_67_volume = p->port1_counter >> 1;
Dsp_Write(p, V7VOLL, p->channel_67_volume);
Dsp_Write(p, V7VOLR, p->channel_67_volume);
Dsp_Write(p, V6VOLL, p->channel_67_volume);
Dsp_Write(p, V6VOLR, p->channel_67_volume);
}
p->port1_current_bit = p->port1_active;
if (!p->port1_current_bit)
return;
Channel *c = &p->channel[7];
p->current_bit = 0x80;
do {
if (Asl(&p->port1_current_bit)) {
p->sfx_channel_index = c->index * 2;
p->dsp_register_index = c->index * 16;
p->sfx_start_arg_pan = c->sfx_pan;
if (!c->sfx_arr_countdown) {
if (c->sfx_which_sound)
Sfx_ChannelTick(p, c, true);
} else {
p->sfx_channel_index = c->index * 2;
if (!--c->sfx_arr_countdown) {
p->sfx_sound_ptr_cur = c->sfx_sound_ptr = WORD(p->ram[0x17C0 + (c->sfx_which_sound - 1) * 2]);
Sfx_ChannelTick(p, c, false);
}
}
}
} while (c--, (p->current_bit >>= 1) != 0x10);
}
static void Port1_HandleCmd(SpcPlayer *p) {
uint8 a = p->new_value_from_snes[1];
if (!(a & 0x80)) {
if (a != 0) {
p->port_to_snes[1] = a;
if (a != 5 || p->port1_active)
Port1_Play_Inner(p);
}
} else {
p->port_to_snes[1] = a;
if (p->port1_active)
p->port1_counter = 0x78;
}
}
static void Port2_StartNewSound(SpcPlayer *p) {
p->port2_current_bit = p->port2_active;
if (!p->port2_current_bit)
return;
Channel *c = &p->channel[7];
p->current_bit = 0x80;
do {
if (Asl(&p->port2_current_bit)) {
p->sfx_channel_index = c->index * 2;
p->dsp_register_index = c->index * 16;
p->sfx_start_arg_pan = c->sfx_pan;
if (!c->sfx_arr_countdown) {
if (c->sfx_which_sound)
Sfx_ChannelTick(p, c, true);
} else {
p->sfx_channel_index = c->index * 2;