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prepare for AtomicSSG

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AY/SSG core extracted from YM2608-LLE
This commit is contained in:
tildearrow 2024-04-29 13:21:00 -05:00
parent 73957ad57d
commit 8db06f359e
5 changed files with 967 additions and 0 deletions
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2
CMakeLists.txt
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@ -534,6 +534,8 @@ src/engine/platform/sound/nes/mmc5.c
src/engine/platform/sound/vera_psg.c src/engine/platform/sound/vera_psg.c
src/engine/platform/sound/vera_pcm.c src/engine/platform/sound/vera_pcm.c
src/engine/platform/sound/atomicssg/ssg.c
src/engine/platform/sound/nes_nsfplay/5e01_apu.cpp src/engine/platform/sound/nes_nsfplay/5e01_apu.cpp
src/engine/platform/sound/nes_nsfplay/5e01_dmc.cpp src/engine/platform/sound/nes_nsfplay/5e01_dmc.cpp
src/engine/platform/sound/nes_nsfplay/nes_apu.cpp src/engine/platform/sound/nes_nsfplay/nes_apu.cpp

339
src/engine/platform/sound/atomicssg/LICENSE Normal file
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@ -0,0 +1,339 @@
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5
src/engine/platform/sound/atomicssg/README.md Normal file
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@ -0,0 +1,5 @@
# AtomicSSG
AY-3-8910/YM2149 emulator based on YM2608-LLE.
stripped down version of it containing the basics needed for AY emulation.

468
src/engine/platform/sound/atomicssg/ssg.c Normal file
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/*
* Copyright (C) 2023-2024 nukeykt
* Copyright (C) 2024 tildearrow
*
* This file is part of AtomicSSG.
*
* 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.
*
* SSG (AY-3-8910/YM2149) emulator.
* based on YM2608-LLE by nukeykt.
*
*/
#include <string.h>
#include "ssg.h"
void SSG_Clock(ssg_t* chip, int clk)
{
int i;
chip->input.clk = clk;
chip->clk1 = !chip->input.clk;
chip->clk2 = chip->input.clk;
chip->ic = !chip->input.ic;
{
int read = !chip->ic && !chip->input.rd && !chip->input.cs;
chip->read0 = !chip->ic && !chip->input.rd && !chip->input.cs && !chip->input.a1 && !chip->input.a0;
int write = !chip->input.wr && !chip->input.cs;
int writeaddr = chip->ic || (!chip->input.wr && !chip->input.cs && !chip->input.a0);
int writedata = !chip->ic && !chip->input.wr && !chip->input.cs && chip->input.a0;
int read1 = !chip->ic && !chip->input.rd && !chip->input.cs && !chip->input.a1 && chip->input.a0;
chip->read2 = !chip->ic && !chip->input.rd && !chip->input.cs && chip->input.a1 && !chip->input.a0;
chip->read3 = !chip->ic && !chip->input.rd && !chip->input.cs && chip->input.a1 && chip->input.a0;
chip->write2 = !chip->ic && !chip->input.wr && !chip->input.cs && chip->input.a1 && !chip->input.a0;
chip->write3 = !chip->ic && !chip->input.wr && !chip->input.cs && chip->input.a1 && chip->input.a0;
chip->ssg_write0 = writeaddr && !chip->input.a1;
chip->ssg_write1 = (writedata && !chip->input.a1) || chip->ic;
chip->ssg_read1 = read1;
chip->o_data_d = !read;
if (writeaddr)
chip->write0_trig0 = 1;
else if (chip->write0_l[0])
chip->write0_trig0 = 0;
if (chip->clk1)
{
chip->write0_trig1 = chip->write0_trig0;
chip->write0_l[1] = chip->write0_l[0];
}
if (chip->clk2)
{
chip->write0_l[0] = chip->write0_trig1;
chip->write0_l[2] = chip->write0_l[1];
}
chip->write0_en = chip->write0_l[0] && !chip->write0_l[2];
if (writedata)
chip->write1_trig0 = 1;
else if (chip->write1_l[0])
chip->write1_trig0 = 0;
if (chip->clk1)
{
chip->write1_trig1 = chip->write1_trig0;
chip->write1_l[1] = chip->write1_l[0];
}
if (chip->clk2)
{
chip->write1_l[0] = chip->write1_trig1;
chip->write1_l[2] = chip->write1_l[1];
}
chip->write1_en = chip->write1_l[0] && !chip->write1_l[2];
if (writeaddr)
chip->write2_trig0 = 1;
else if (chip->write2_l[0])
chip->write2_trig0 = 0;
if (chip->clk1)
{
chip->write2_trig1 = chip->write2_trig0;
chip->write2_l[1] = chip->write2_l[0];
}
if (chip->clk2)
{
chip->write2_l[0] = chip->write2_trig1;
chip->write2_l[2] = chip->write2_l[1];
}
chip->write2_en = chip->write2_l[0] && !chip->write2_l[2];
if (writedata)
chip->write3_trig0 = 1;
else if (chip->write3_l[0])
chip->write3_trig0 = 0;
if (write)
chip->data_l = (chip->input.data & 255) | (chip->input.a1 << 8);
if (chip->ic)
chip->data_bus2 |= 0x2f;
else
if (!read && !chip->ic)
chip->data_bus2 = chip->data_l ^ 0x1ff;
if (chip->ic_latch_fm[1])
{
chip->data_bus1 &= ~255;
}
else if (!read && !chip->ic)
{
chip->data_bus1 = chip->data_l;
}
}
{
chip->ssg_clk1 = chip->clk1;
chip->ssg_clk2 = chip->clk2;
if (chip->ic)
chip->ssg_ssg_addr = 0;
else if (chip->ssg_write0)
chip->ssg_ssg_addr = (chip->data_bus1 & 0xf0) == 0;
if (chip->ic)
chip->ssg_address = 0;
else if (chip->ssg_write0 && (chip->data_bus1 & 0xe0) == 0)
chip->ssg_address = chip->data_bus1 & 0x1f;
int ssg_access = chip->ssg_ssg_addr && (chip->ssg_write1 || chip->ssg_read1);
if (chip->ssg_egtrig_rst)
chip->ssg_egtrig = 0;
if (chip->ic)
{
chip->ssg_freq_a[0] = chip->data_bus1 & 255;
chip->ssg_freq_a[1] = chip->data_bus1 & 15;
chip->ssg_freq_b[0] = chip->data_bus1 & 255;
chip->ssg_freq_b[1] = chip->data_bus1 & 15;
chip->ssg_freq_c[0] = chip->data_bus1 & 255;
chip->ssg_freq_c[1] = chip->data_bus1 & 15;
chip->ssg_noise = chip->data_bus1 & 31;
chip->ssg_mode = chip->data_bus1 & 255;
chip->ssg_level_a = chip->data_bus1 & 31;
chip->ssg_level_b = chip->data_bus1 & 31;
chip->ssg_level_c = chip->data_bus1 & 31;
chip->ssg_env[0] = chip->data_bus1 & 255;
chip->ssg_env[1] = chip->data_bus1 & 255;
chip->ssg_envmode = chip->data_bus1 & 15;
chip->o_gpio_a = chip->data_bus1 & 255;
chip->o_gpio_b = chip->data_bus1 & 255;
chip->ssg_egtrig = 1;
}
else if (chip->ssg_ssg_addr && chip->ssg_write1)
{
switch (chip->ssg_address)
{
case 0x0:
chip->ssg_freq_a[0] = chip->data_bus1 & 255;
break;
case 0x1:
chip->ssg_freq_a[1] = chip->data_bus1 & 15;
break;
case 0x2:
chip->ssg_freq_b[0] = chip->data_bus1 & 255;
break;
case 0x3:
chip->ssg_freq_b[1] = chip->data_bus1 & 15;
break;
case 0x4:
chip->ssg_freq_c[0] = chip->data_bus1 & 255;
break;
case 0x5:
chip->ssg_freq_c[1] = chip->data_bus1 & 15;
break;
case 0x6:
chip->ssg_noise = chip->data_bus1 & 31;
break;
case 0x7:
chip->ssg_mode = chip->data_bus1 & 255;
break;
case 0x8:
chip->ssg_level_a = chip->data_bus1 & 31;
break;
case 0x9:
chip->ssg_level_b = chip->data_bus1 & 31;
break;
case 0xa:
chip->ssg_level_c = chip->data_bus1 & 31;
break;
case 0xb:
chip->ssg_env[0] = chip->data_bus1 & 255;
break;
case 0xc:
chip->ssg_env[1] = chip->data_bus1 & 255;
break;
case 0xd:
chip->ssg_envmode = chip->data_bus1 & 15;
chip->ssg_egtrig = 1;
break;
case 0xe:
chip->o_gpio_a = chip->data_bus1 & 255;
break;
case 0xf:
chip->o_gpio_b = chip->data_bus1 & 255;
break;
}
}
if (chip->ssg_ssg_addr && chip->ssg_read1)
{
switch (chip->ssg_address)
{
case 0x0:
chip->data_bus1 &= ~255;
chip->data_bus1 |= chip->ssg_freq_a[0] & 255;
break;
case 0x1:
chip->data_bus1 &= ~15;
chip->data_bus1 |= chip->ssg_freq_a[1] & 15;
break;
case 0x2:
chip->data_bus1 &= ~255;
chip->data_bus1 |= chip->ssg_freq_b[0] & 255;
break;
case 0x3:
chip->data_bus1 &= ~15;
chip->data_bus1 |= chip->ssg_freq_b[1] & 15;
break;
case 0x4:
chip->data_bus1 &= ~255;
chip->data_bus1 |= chip->ssg_freq_c[0] & 255;
break;
case 0x5:
chip->data_bus1 &= ~15;
chip->data_bus1 |= chip->ssg_freq_c[1] & 15;
break;
case 0x6:
chip->data_bus1 &= ~31;
chip->data_bus1 |= chip->ssg_noise & 31;
break;
case 0x7:
chip->data_bus1 &= ~255;
chip->data_bus1 |= chip->ssg_mode & 255;
break;
case 0x8:
chip->data_bus1 &= ~31;
chip->data_bus1 |= chip->ssg_level_a & 31;
break;
case 0x9:
chip->data_bus1 &= ~31;
chip->data_bus1 |= chip->ssg_level_b & 31;
break;
case 0xa:
chip->data_bus1 &= ~31;
chip->data_bus1 |= chip->ssg_level_c & 31;
break;
case 0xb:
chip->data_bus1 &= ~255;
chip->data_bus1 |= chip->ssg_env[0] & 255;
break;
case 0xc:
chip->data_bus1 &= ~255;
chip->data_bus1 |= chip->ssg_env[1] & 255;
break;
case 0xd:
chip->data_bus1 &= ~15;
chip->data_bus1 |= chip->ssg_envmode & 15;
break;
case 0xe:
chip->data_bus1 &= ~15;
chip->data_bus1 |= chip->input.gpio_a & 15;
break;
case 0xf:
chip->data_bus1 &= ~255;
chip->data_bus1 |= chip->input.gpio_b & 255;
break;
}
}
if (chip->ssg_clk1)
{
chip->ssg_envadd = (chip->ssg_eg_of[1] & 4) != 0 && (chip->ssg_sel[1] & 8) != 0;
chip->ssg_envcnt[1] = chip->ssg_hold[0] ? 31 : chip->ssg_envcnt[0];
chip->ssg_dir[1] = chip->ssg_dir[0];
chip->ssg_hold[1] = chip->ssg_hold[0];
chip->ssg_t2[1] = chip->ssg_t2[0];
chip->ssg_egtrig_s = chip->ssg_egtrig;
chip->ssg_eg_sel_l = (chip->ssg_sel[1] & 8) != 0;
chip->ssg_sel[0] = chip->ssg_sel[1] << 1;
chip->ssg_sel[0] |= (chip->ssg_sel[1] & 7) == 0 && !chip->ic;
chip->ssg_sel_freq = 0;
if (chip->ssg_sel[1] & 1)
chip->ssg_sel_freq |= (chip->ssg_freq_c[1] << 8) | chip->ssg_freq_c[0];
if (chip->ssg_sel[1] & 2)
chip->ssg_sel_freq |= (chip->ssg_freq_b[1] << 8) | chip->ssg_freq_b[0];
if (chip->ssg_sel[1] & 4)
chip->ssg_sel_freq |= (chip->ssg_freq_a[1] << 8) | chip->ssg_freq_a[0];
if (chip->ssg_sel[1] & 8)
chip->ssg_sel_freq |= (chip->ssg_env[1] << 8) | chip->ssg_env[0];
int cnt = chip->ssg_freq_cnt[7] + 1;
int of = (cnt & 0x1000) != 0;
chip->ssg_freq_cnt[0] = cnt & 0xfff;
chip->ssg_freq_cnt[4] = chip->ssg_freq_cnt[3];
chip->ssg_freq_cnt[6] = chip->ssg_freq_cnt[5];
chip->ssg_cnt_of[1] = chip->ssg_cnt_of[0];
if (chip->ssg_sel[1] & 8)
chip->ssg_sign_toggle = chip->ssg_cnt_of[0] & 7;
else
chip->ssg_sign_toggle = 0;
chip->ssg_freq_cnt2[1] = chip->ssg_freq_cnt2[0];
chip->ssg_freq_cnt2[3] = chip->ssg_freq_cnt2[2];
chip->ssg_freq_cnt2[5] = chip->ssg_freq_cnt2[4];
chip->ssg_freq_cnt2[7] = chip->ssg_freq_cnt2[6];
chip->ssg_sign[1] = chip->ssg_sign[0];
int cnt_of = !chip->ssg_cnt_reload && (chip->ssg_sel_freq_l - chip->ssg_cnt_of_l < chip->ssg_freq_cnt2[0]);
chip->ssg_cnt2_add = (chip->ssg_sel[1] & 8) != 0 && of;
chip->ssg_sel_eg_l[0] = (chip->ssg_sel[1] & 8) != 0;
chip->ssg_eg_of[0] = (chip->ssg_eg_of[1] << 1) | cnt_of;
int fr_rst = chip->ssg_ch_of || ((cnt_of || chip->ssg_cnt_reload) && chip->ssg_sel_eg_l[1]);
chip->ssg_freq_cnt[2] = fr_rst ? 0 : chip->ssg_freq_cnt[1];
chip->ssg_fr_rst_l = fr_rst;
chip->ssg_noise_add = (chip->ssg_sel[1] & 1) != 0;
chip->ssg_noise_cnt[1] = chip->ssg_noise_cnt[0];
int noise_of = chip->ssg_noise <= (chip->ssg_noise_cnt[0] >> 1);
chip->ssg_noise_of = noise_of && chip->ssg_noise_of_low;
chip->ssg_test = chip->input.test;
chip->ssg_noise_step = chip->ssg_noise_of || !chip->ssg_test;
}
if (chip->ssg_clk2)
{
int sum = chip->ssg_envcnt[1] + chip->ssg_envadd;
int of = (sum & 32) != 0;
chip->ssg_envcnt[0] = chip->ssg_egtrig_s ? 0 : sum & 31;
int dir = of && (chip->ssg_envmode & 2) != 0 && !chip->ssg_hold[1];
chip->ssg_dir[0] = chip->ssg_egtrig_s ? 0 : chip->ssg_dir[1] ^ dir;
chip->ssg_hold[0] = chip->ssg_egtrig_s ? 0 : chip->ssg_hold[1] || (of && (chip->ssg_envmode & 1) != 0);
chip->ssg_t2[0] = chip->ssg_egtrig_s ? 0 : chip->ssg_t2[1] || of;
chip->ssg_egtrig_rst = chip->ssg_egtrig_s && chip->ssg_eg_sel_l;
chip->ssg_sel[1] = chip->ssg_sel[0];
chip->ssg_freq_cnt[1] = chip->ssg_freq_cnt[0];
chip->ssg_freq_cnt[3] = chip->ssg_freq_cnt[2];
chip->ssg_freq_cnt[5] = chip->ssg_freq_cnt[4];
chip->ssg_freq_cnt[7] = chip->ssg_freq_cnt[6];
int cnt_of = (chip->ssg_sel_freq & 0xfff) <= chip->ssg_freq_cnt[0];
chip->ssg_cnt_of_l = cnt_of;
chip->ssg_sel_freq_l = (chip->ssg_sel_freq >> 12) & 0xf;
chip->ssg_cnt_of[0] = (chip->ssg_cnt_of[1] << 1) | cnt_of;
if (chip->ic)
chip->ssg_sign[0] = 0;
else
chip->ssg_sign[0] = chip->ssg_sign[1] ^ chip->ssg_sign_toggle;
int cnt = chip->ssg_freq_cnt2[7] + chip->ssg_cnt2_add;
chip->ssg_freq_cnt2[0] = cnt & 0xf;
chip->ssg_freq_cnt2[2] = chip->ssg_fr_rst_l ? 0 : chip->ssg_freq_cnt2[1];
chip->ssg_freq_cnt2[4] = chip->ssg_freq_cnt2[3];
chip->ssg_freq_cnt2[6] = chip->ssg_freq_cnt2[5];
chip->ssg_sel_eg_l[1] = chip->ssg_sel_eg_l[0];
chip->ssg_ch_of = (!chip->ssg_sel_eg_l[0] && cnt_of) || chip->ic;
chip->ssg_cnt_reload = chip->ssg_sel_eg_l[0] && chip->ssg_egtrig_s;
chip->ssg_eg_of[1] = chip->ssg_eg_of[0];
chip->ssg_noise_cnt[0] = chip->ssg_noise_step ? 0 : ((chip->ssg_noise_cnt[1] + chip->ssg_noise_add) & 63);
chip->ssg_noise_of_low = (chip->ssg_noise_cnt[1] & 1) != 0 && chip->ssg_noise_add;
}
if (!chip->ssg_noise_step)
{
int bit = ((chip->ssg_noise_lfsr[1] >> 16) ^ (chip->ssg_noise_lfsr[1] >> 13)) & 1;
if ((chip->ssg_noise_lfsr[1] & 0x1ffff) == 0)
bit |= 1;
chip->ssg_noise_lfsr[0] = (chip->ssg_noise_lfsr[1] << 1) | bit;
}
else
{
chip->ssg_noise_lfsr[1] = chip->ic ? 0 : chip->ssg_noise_lfsr[0];
}
if (chip->ssg_clk2)
chip->ssg_noise_bit = (chip->ssg_noise_lfsr[1] >> 16) & 1;
int envlevel = chip->ssg_hold[0] ? 31 : chip->ssg_envcnt[0];
envlevel = (chip->ssg_dir[0] ^ ((chip->ssg_envmode >> 2) & 1)) == 0 ? (envlevel ^ 31) : envlevel;
envlevel = (chip->ssg_t2[0] && (chip->ssg_envmode & 8) == 0) ? 0 : envlevel;
int vol_a = (chip->ssg_level_a & 0x10) != 0 ? envlevel : (((chip->ssg_level_a & 15) << 1) | 1);
int vol_b = (chip->ssg_level_b & 0x10) != 0 ? envlevel : (((chip->ssg_level_b & 15) << 1) | 1);
int vol_c = (chip->ssg_level_c & 0x10) != 0 ? envlevel : (((chip->ssg_level_c & 15) << 1) | 1);
int sign_a = ((chip->ssg_mode & 1) == 0 && (chip->ssg_sign[0] & 1) != 0) || ((chip->ssg_mode & 8) == 0 && chip->ssg_noise_bit);
int sign_b = ((chip->ssg_mode & 2) == 0 && (chip->ssg_sign[0] & 2) != 0) || ((chip->ssg_mode & 16) == 0 && chip->ssg_noise_bit);
int sign_c = ((chip->ssg_mode & 4) == 0 && (chip->ssg_sign[0] & 4) != 0) || ((chip->ssg_mode & 32) == 0 && chip->ssg_noise_bit);
static const float volume_lut[32] = {
0.0000, 0.0000, 0.0049, 0.0075, 0.0105, 0.0131, 0.0156, 0.0183,
0.0228, 0.0276, 0.0321, 0.0367, 0.0448, 0.0535, 0.0626, 0.0713,
0.0884, 0.1057, 0.1225, 0.1392, 0.1691, 0.2013, 0.2348, 0.2670,
0.3307, 0.3951, 0.4573, 0.5196, 0.6316, 0.7528, 0.8787, 1.0000
};
chip->o_analog[0] = volume_lut[sign_a ? 0 : vol_a];
chip->o_analog[1] = volume_lut[sign_b ? 0 : vol_b];
chip->o_analog[2] = volume_lut[sign_c ? 0 : vol_c];
}
{
chip->read_bus = 0; // FIXME
if (chip->ssg_read1
|| chip->read3
)
chip->read_bus = chip->data_bus1 & 255;
chip->o_data = chip->read_bus;
}
}

153
src/engine/platform/sound/atomicssg/ssg.h Normal file
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/*
* Copyright (C) 2023-2024 nukeykt
* Copyright (C) 2024 tildearrow
*
* This file is part of AtomicSSG.
*
* 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.
*
* SSG (AY-3-8910/YM2149) emulator.
* based on YM2608-LLE by nukeykt.
*
*/
typedef struct {
int clk;
int ic; // neg
int cs; // neg
int wr; // neg
int rd; // neg
int a0;
int a1;
int data;
int test; // set to 1
int gpio_a;
int gpio_b;
}
ssg_input_t;
typedef struct {
ssg_input_t input;
int ic;
int ic_latch1[2];
int ic_latch2[2];
int ic_latch3[2];
int ic_check1;
int ic_check3;
int prescaler_latch[2];
int ic_check2;
int prescaler_sel[2];
int pssel_l[15][2];
int ic_latch_fm[2];
int clk1;
int clk2;
int ssg_write0;
int ssg_write1;
int ssg_read1;
int write2;
int write3;
int read2;
int read3;
int read0;
int write0_trig0;
int write0_trig1;
int write0_l[3];
int write0_en;
int write1_trig0;
int write1_trig1;
int write1_l[3];
int write1_en;
int write2_trig0;
int write2_trig1;
int write2_l[3];
int write2_en;
int write3_trig0;
int write3_trig1;
int write3_l[3];
int write3_en;
int data_l;
int data_bus1;
int data_bus2; // inverted
int read_bus;
int ssg_clk1;
int ssg_clk2;
int ssg_ssg_addr;
int ssg_address;
int ssg_freq_a[2];
int ssg_freq_b[2];
int ssg_freq_c[2];
int ssg_noise;
int ssg_mode;
int ssg_level_a;
int ssg_level_b;
int ssg_level_c;
int ssg_env[2];
int ssg_envmode;
int ssg_envadd;
int ssg_envcnt[2];
int ssg_dir[2];
int ssg_hold[2];
int ssg_t2[2];
int ssg_egtrig;
int ssg_egtrig_s;
int ssg_egtrig_rst;
int ssg_eg_sel_l;
int ssg_sel[2];
int ssg_sel_freq;
int ssg_freq_cnt[8];
int ssg_cnt_of[2];
int ssg_sign[2];
int ssg_sign_toggle;
int ssg_cnt_of_l;
int ssg_freq_cnt2[8];
int ssg_sel_freq_l;
int ssg_cnt2_add;
int ssg_sel_eg_l[2];
int ssg_ch_of;
int ssg_cnt_reload;
int ssg_eg_of[2];
int ssg_fr_rst_l;
int ssg_noise_add;
int ssg_noise_cnt[2];
int ssg_noise_of_low;
int ssg_noise_of;
int ssg_test;
int ssg_noise_step;
int ssg_noise_lfsr[2];
int ssg_noise_bit;
int o_gpio_a;
int o_gpio_a_d;
int o_gpio_b;
int o_gpio_b_d;
float o_analog[3];
int o_data;
int o_data_d;
}
ssg_t;
void SSG_Clock(ssg_t* chip, int clk);