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598 lines (565 loc) · 16.5 KB
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/*
* apokeysnd.c - another POKEY sound emulator
*
* Copyright (C) 2007-2009 Piotr Fusik
*
* This file is part of ASAP (Another Slight Atari Player),
* see http://asap.sourceforge.net
*
* ASAP 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.
*
* ASAP 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 ASAP; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "asap_internal.h"
#define ULTRASOUND_CYCLES 112
#define MUTE_FREQUENCY 1
#define MUTE_INIT 2
#define MUTE_USER 4
CONST_ARRAY(byte, poly4_lookup)
0, 0, 0, 0, 1, 1, 1, 0, 1, 1, 0, 0, 1, 0, 1
END_CONST_ARRAY;
CONST_ARRAY(byte, poly5_lookup)
0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 1,
0, 1, 0, 1, 1, 1, 1, 0, 1, 1, 0, 1, 0, 0, 1, 1
END_CONST_ARRAY;
PRIVATE FUNC(void, PokeySound_InitializeChip, (P(PokeyState PTR, pst)))
{
pst _ audctl = 0;
pst _ init = FALSE;
pst _ poly_index = 15 * 31 * 131071;
pst _ div_cycles = 28;
pst _ mute1 = MUTE_FREQUENCY | MUTE_USER;
pst _ mute2 = MUTE_FREQUENCY | MUTE_USER;
pst _ mute3 = MUTE_FREQUENCY | MUTE_USER;
pst _ mute4 = MUTE_FREQUENCY | MUTE_USER;
pst _ audf1 = 0;
pst _ audf2 = 0;
pst _ audf3 = 0;
pst _ audf4 = 0;
pst _ audc1 = 0;
pst _ audc2 = 0;
pst _ audc3 = 0;
pst _ audc4 = 0;
pst _ tick_cycle1 = NEVER;
pst _ tick_cycle2 = NEVER;
pst _ tick_cycle3 = NEVER;
pst _ tick_cycle4 = NEVER;
pst _ period_cycles1 = 28;
pst _ period_cycles2 = 28;
pst _ period_cycles3 = 28;
pst _ period_cycles4 = 28;
pst _ reload_cycles1 = 28;
pst _ reload_cycles3 = 28;
pst _ out1 = 0;
pst _ out2 = 0;
pst _ out3 = 0;
pst _ out4 = 0;
pst _ delta1 = 0;
pst _ delta2 = 0;
pst _ delta3 = 0;
pst _ delta4 = 0;
pst _ skctl = 3;
ZERO_ARRAY(pst _ delta_buffer);
}
FUNC(void, PokeySound_Initialize, (P(ASAP_State PTR, ast)))
{
V(int, i);
V(int, reg);
reg = 0x1ff;
for (i = 0; i < 511; i++) {
reg = ((((reg >> 5) ^ reg) & 1) << 8) + (reg >> 1);
ast _ poly9_lookup[i] = TO_BYTE(reg);
}
reg = 0x1ffff;
for (i = 0; i < 16385; i++) {
reg = ((((reg >> 5) ^ reg) & 0xff) << 9) + (reg >> 8);
ast _ poly17_lookup[i] = TO_BYTE(reg >> 1);
}
ast _ sample_offset = 0;
ast _ sample_index = 0;
ast _ samples = 0;
ast _ iir_acc_left = 0;
ast _ iir_acc_right = 0;
PokeySound_InitializeChip(ADDRESSOF ast _ base_pokey);
PokeySound_InitializeChip(ADDRESSOF ast _ extra_pokey);
}
#define DO_TICK(ch) \
if (pst _ init) { \
switch (pst _ audc##ch >> 4) { \
case 10: \
case 14: \
pst _ out##ch ^= 1; \
pst _ delta_buffer[CYCLE_TO_SAMPLE(cycle)] += pst _ delta##ch = -pst _ delta##ch; \
break; \
default: \
break; \
} \
} \
else { \
V(int, poly) = cycle + pst _ poly_index - (ch - 1); \
V(int, newout) = pst _ out##ch; \
switch (pst _ audc##ch >> 4) { \
case 0: \
if (poly5_lookup[poly % 31] != 0) { \
if ((pst _ audctl & 0x80) != 0) \
newout = ast _ poly9_lookup[poly % 511] & 1; \
else { \
poly %= 131071; \
newout = (ast _ poly17_lookup[poly >> 3] >> (poly & 7)) & 1; \
} \
} \
break; \
case 2: \
case 6: \
newout ^= poly5_lookup[poly % 31]; \
break; \
case 4: \
if (poly5_lookup[poly % 31] != 0) \
newout = poly4_lookup[poly % 15]; \
break; \
case 8: \
if ((pst _ audctl & 0x80) != 0) \
newout = ast _ poly9_lookup[poly % 511] & 1; \
else { \
poly %= 131071; \
newout = (ast _ poly17_lookup[poly >> 3] >> (poly & 7)) & 1; \
} \
break; \
case 10: \
case 14: \
newout ^= 1; \
break; \
case 12: \
newout = poly4_lookup[poly % 15]; \
break; \
default: \
break; \
} \
if (newout != pst _ out##ch) { \
pst _ out##ch = newout; \
pst _ delta_buffer[CYCLE_TO_SAMPLE(cycle)] += pst _ delta##ch = -pst _ delta##ch; \
} \
}
/* Fills delta_buffer up to current_cycle basing on current AUDF/AUDC/AUDCTL values. */
PRIVATE FUNC(void, PokeySound_GenerateUntilCycle, (P(ASAP_State PTR, ast), P(PokeyState PTR, pst), P(int, current_cycle)))
{
for (;;) {
V(int, cycle) = current_cycle;
if (cycle > pst _ tick_cycle1)
cycle = pst _ tick_cycle1;
if (cycle > pst _ tick_cycle2)
cycle = pst _ tick_cycle2;
if (cycle > pst _ tick_cycle3)
cycle = pst _ tick_cycle3;
if (cycle > pst _ tick_cycle4)
cycle = pst _ tick_cycle4;
if (cycle == current_cycle)
break;
if (cycle == pst _ tick_cycle3) {
pst _ tick_cycle3 += pst _ period_cycles3;
if ((pst _ audctl & 4) != 0 && pst _ delta1 > 0 && pst _ mute1 == 0)
pst _ delta_buffer[CYCLE_TO_SAMPLE(cycle)] += pst _ delta1 = -pst _ delta1;
DO_TICK(3);
}
if (cycle == pst _ tick_cycle4) {
pst _ tick_cycle4 += pst _ period_cycles4;
if ((pst _ audctl & 8) != 0)
pst _ tick_cycle3 = cycle + pst _ reload_cycles3;
if ((pst _ audctl & 2) != 0 && pst _ delta2 > 0 && pst _ mute2 == 0)
pst _ delta_buffer[CYCLE_TO_SAMPLE(cycle)] += pst _ delta2 = -pst _ delta2;
DO_TICK(4);
}
if (cycle == pst _ tick_cycle1) {
pst _ tick_cycle1 += pst _ period_cycles1;
if ((pst _ skctl & 0x88) == 8) /* two-tone, sending 1 (i.e. timer1) */
pst _ tick_cycle2 = cycle + pst _ period_cycles2;
DO_TICK(1);
}
if (cycle == pst _ tick_cycle2) {
pst _ tick_cycle2 += pst _ period_cycles2;
if ((pst _ audctl & 0x10) != 0)
pst _ tick_cycle1 = cycle + pst _ reload_cycles1;
else if ((pst _ skctl & 8) != 0) /* two-tone */
pst _ tick_cycle1 = cycle + pst _ period_cycles1;
DO_TICK(2);
}
}
}
#ifdef APOKEYSND
#define CURRENT_CYCLE 0
#define CURRENT_SAMPLE 0
#define DO_STORE(reg) \
if (data == pst _ reg) \
break; \
pst _ reg = data;
#else
#define CURRENT_CYCLE ast _ cycle
#define CURRENT_SAMPLE CYCLE_TO_SAMPLE(ast _ cycle)
#define DO_STORE(reg) \
if (data == pst _ reg) \
break; \
PokeySound_GenerateUntilCycle(ast, pst, ast _ cycle); \
pst _ reg = data;
#endif /* APOKEYSND */
#define MUTE_CHANNEL(ch, cond, mask) \
if (cond) { \
pst _ mute##ch |= mask; \
pst _ tick_cycle##ch = NEVER; \
} \
else { \
pst _ mute##ch &= ~mask; \
if (pst _ tick_cycle##ch == NEVER && pst _ mute##ch == 0) \
pst _ tick_cycle##ch = CURRENT_CYCLE; \
}
#define DO_ULTRASOUND(ch) \
MUTE_CHANNEL(ch, pst _ period_cycles##ch <= ULTRASOUND_CYCLES && (pst _ audc##ch >> 4 == 10 || pst _ audc##ch >> 4 == 14), MUTE_FREQUENCY)
#define DO_AUDC(ch) \
DO_STORE(audc##ch); \
if ((data & 0x10) != 0) { \
data = (data & 0xf) << DELTA_SHIFT_POKEY; \
if ((pst _ mute##ch & MUTE_USER) == 0) \
pst _ delta_buffer[CURRENT_SAMPLE] \
+= pst _ delta##ch > 0 ? data - pst _ delta##ch : data; \
pst _ delta##ch = data; \
} \
else { \
data = (data & 0xf) << DELTA_SHIFT_POKEY; \
DO_ULTRASOUND(ch); \
if (pst _ delta##ch > 0) { \
if ((pst _ mute##ch & MUTE_USER) == 0) \
pst _ delta_buffer[CURRENT_SAMPLE] \
+= data - pst _ delta##ch; \
pst _ delta##ch = data; \
} \
else \
pst _ delta##ch = -data; \
} \
break;
#define DO_INIT(ch, cond) \
MUTE_CHANNEL(ch, pst _ init && cond, MUTE_INIT)
FUNC(void, PokeySound_PutByte, (P(ASAP_State PTR, ast), P(int, addr), P(int, data)))
{
V(PokeyState PTR, pst) = (addr & ast _ extra_pokey_mask) != 0
? ADDRESSOF ast _ extra_pokey : ADDRESSOF ast _ base_pokey;
switch (addr & 0xf) {
case 0x00:
DO_STORE(audf1);
switch (pst _ audctl & 0x50) {
case 0x00:
pst _ period_cycles1 = pst _ div_cycles * (data + 1);
break;
case 0x10:
pst _ period_cycles2 = pst _ div_cycles * (data + 256 * pst _ audf2 + 1);
pst _ reload_cycles1 = pst _ div_cycles * (data + 1);
DO_ULTRASOUND(2);
break;
case 0x40:
pst _ period_cycles1 = data + 4;
break;
case 0x50:
pst _ period_cycles2 = data + 256 * pst _ audf2 + 7;
pst _ reload_cycles1 = data + 4;
DO_ULTRASOUND(2);
break;
}
DO_ULTRASOUND(1);
break;
case 0x01:
DO_AUDC(1)
case 0x02:
DO_STORE(audf2);
switch (pst _ audctl & 0x50) {
case 0x00:
case 0x40:
pst _ period_cycles2 = pst _ div_cycles * (data + 1);
break;
case 0x10:
pst _ period_cycles2 = pst _ div_cycles * (pst _ audf1 + 256 * data + 1);
break;
case 0x50:
pst _ period_cycles2 = pst _ audf1 + 256 * data + 7;
break;
}
DO_ULTRASOUND(2);
break;
case 0x03:
DO_AUDC(2)
case 0x04:
DO_STORE(audf3);
switch (pst _ audctl & 0x28) {
case 0x00:
pst _ period_cycles3 = pst _ div_cycles * (data + 1);
break;
case 0x08:
pst _ period_cycles4 = pst _ div_cycles * (data + 256 * pst _ audf4 + 1);
pst _ reload_cycles3 = pst _ div_cycles * (data + 1);
DO_ULTRASOUND(4);
break;
case 0x20:
pst _ period_cycles3 = data + 4;
break;
case 0x28:
pst _ period_cycles4 = data + 256 * pst _ audf4 + 7;
pst _ reload_cycles3 = data + 4;
DO_ULTRASOUND(4);
break;
}
DO_ULTRASOUND(3);
break;
case 0x05:
DO_AUDC(3)
case 0x06:
DO_STORE(audf4);
switch (pst _ audctl & 0x28) {
case 0x00:
case 0x20:
pst _ period_cycles4 = pst _ div_cycles * (data + 1);
break;
case 0x08:
pst _ period_cycles4 = pst _ div_cycles * (pst _ audf3 + 256 * data + 1);
break;
case 0x28:
pst _ period_cycles4 = pst _ audf3 + 256 * data + 7;
break;
}
DO_ULTRASOUND(4);
break;
case 0x07:
DO_AUDC(4)
case 0x08:
DO_STORE(audctl);
pst _ div_cycles = ((data & 1) != 0) ? 114 : 28;
/* TODO: tick_cycles */
switch (data & 0x50) {
case 0x00:
pst _ period_cycles1 = pst _ div_cycles * (pst _ audf1 + 1);
pst _ period_cycles2 = pst _ div_cycles * (pst _ audf2 + 1);
break;
case 0x10:
pst _ period_cycles1 = pst _ div_cycles * 256;
pst _ period_cycles2 = pst _ div_cycles * (pst _ audf1 + 256 * pst _ audf2 + 1);
pst _ reload_cycles1 = pst _ div_cycles * (pst _ audf1 + 1);
break;
case 0x40:
pst _ period_cycles1 = pst _ audf1 + 4;
pst _ period_cycles2 = pst _ div_cycles * (pst _ audf2 + 1);
break;
case 0x50:
pst _ period_cycles1 = 256;
pst _ period_cycles2 = pst _ audf1 + 256 * pst _ audf2 + 7;
pst _ reload_cycles1 = pst _ audf1 + 4;
break;
}
DO_ULTRASOUND(1);
DO_ULTRASOUND(2);
switch (data & 0x28) {
case 0x00:
pst _ period_cycles3 = pst _ div_cycles * (pst _ audf3 + 1);
pst _ period_cycles4 = pst _ div_cycles * (pst _ audf4 + 1);
break;
case 0x08:
pst _ period_cycles3 = pst _ div_cycles * 256;
pst _ period_cycles4 = pst _ div_cycles * (pst _ audf3 + 256 * pst _ audf4 + 1);
pst _ reload_cycles3 = pst _ div_cycles * (pst _ audf3 + 1);
break;
case 0x20:
pst _ period_cycles3 = pst _ audf3 + 4;
pst _ period_cycles4 = pst _ div_cycles * (pst _ audf4 + 1);
break;
case 0x28:
pst _ period_cycles3 = 256;
pst _ period_cycles4 = pst _ audf3 + 256 * pst _ audf4 + 7;
pst _ reload_cycles3 = pst _ audf3 + 4;
break;
}
DO_ULTRASOUND(3);
DO_ULTRASOUND(4);
DO_INIT(1, (data & 0x40) == 0);
DO_INIT(2, (data & 0x50) != 0x50);
DO_INIT(3, (data & 0x20) == 0);
DO_INIT(4, (data & 0x28) != 0x28);
break;
case 0x09:
/* TODO: STIMER */
break;
case 0x0f:
DO_STORE(skctl);
pst _ init = ((data & 3) == 0);
DO_INIT(1, (pst _ audctl & 0x40) == 0);
DO_INIT(2, (pst _ audctl & 0x50) != 0x50);
DO_INIT(3, (pst _ audctl & 0x20) == 0);
DO_INIT(4, (pst _ audctl & 0x28) != 0x28);
break;
default:
break;
}
}
FUNC(int, PokeySound_GetRandom, (P(ASAP_State PTR, ast), P(int, addr), P(int, cycle)))
{
V(PokeyState PTR, pst) = (addr & ast _ extra_pokey_mask) != 0
? ADDRESSOF ast _ extra_pokey : ADDRESSOF ast _ base_pokey;
V(int, i);
if (pst _ init)
return 0xff;
i = cycle + pst _ poly_index;
if ((pst _ audctl & 0x80) != 0)
return ast _ poly9_lookup[i % 511];
else {
V(int, j);
i %= 131071;
j = i >> 3;
i &= 7;
return ((ast _ poly17_lookup[j] >> i) + (ast _ poly17_lookup[j + 1] << (8 - i))) & 0xff;
}
}
PRIVATE FUNC(void, end_frame, (P(ASAP_State PTR, ast), P(PokeyState PTR, pst), P(int, cycle_limit)))
{
V(int, m);
PokeySound_GenerateUntilCycle(ast, pst, cycle_limit);
pst _ poly_index += cycle_limit;
m = ((pst _ audctl & 0x80) != 0) ? 15 * 31 * 511 : 15 * 31 * 131071;
if (pst _ poly_index >= 2 * m)
pst _ poly_index -= m;
if (pst _ tick_cycle1 != NEVER)
pst _ tick_cycle1 -= cycle_limit;
if (pst _ tick_cycle2 != NEVER)
pst _ tick_cycle2 -= cycle_limit;
if (pst _ tick_cycle3 != NEVER)
pst _ tick_cycle3 -= cycle_limit;
if (pst _ tick_cycle4 != NEVER)
pst _ tick_cycle4 -= cycle_limit;
}
FUNC(void, PokeySound_StartFrame, (P(ASAP_State PTR, ast)))
{
ZERO_ARRAY(ast _ base_pokey.delta_buffer);
if (ast _ extra_pokey_mask != 0)
ZERO_ARRAY(ast _ extra_pokey.delta_buffer);
}
FUNC(void, PokeySound_EndFrame, (P(ASAP_State PTR, ast), P(int, current_cycle)))
{
end_frame(ast, ADDRESSOF ast _ base_pokey, current_cycle);
if (ast _ extra_pokey_mask != 0)
end_frame(ast, ADDRESSOF ast _ extra_pokey, current_cycle);
ast _ sample_offset += current_cycle * ASAP_SAMPLE_RATE;
ast _ sample_index = 0;
ast _ samples = TO_INT(ast _ sample_offset / ASAP_MAIN_CLOCK);
ast _ sample_offset %= ASAP_MAIN_CLOCK;
}
/* Fills buffer with samples from delta_buffer. */
FUNC(int, PokeySound_Generate, (P(ASAP_State PTR, ast), P(BYTEARRAY, buffer), P(int, buffer_offset), P(int, blocks), P(ASAP_SampleFormat, format)))
{
V(int, i) = ast _ sample_index;
V(int, samples) = ast _ samples;
V(int, acc_left) = ast _ iir_acc_left;
V(int, acc_right) = ast _ iir_acc_right;
if (blocks < samples - i)
samples = i + blocks;
else
blocks = samples - i;
for (; i < samples; i++) {
#ifdef ACTIONSCRIPT
acc_left += ast _ base_pokey.delta_buffer[i] - (acc_left * 3 >> 10);
var sample : Number = acc_left / 33553408;
buffer.writeFloat(sample);
if (ast.extra_pokey_mask != 0) {
acc_right += ast _ extra_pokey.delta_buffer[i] - (acc_right * 3 >> 10);
sample = acc_right / 33553408;
}
buffer.writeFloat(sample);
#else
V(int, sample);
acc_left += ast _ base_pokey.delta_buffer[i] - (acc_left * 3 >> 10);
sample = acc_left >> 10;
#define STORE_SAMPLE \
if (sample < -32767) \
sample = -32767; \
else if (sample > 32767) \
sample = 32767; \
switch (format) { \
case ASAP_FORMAT_U8: \
buffer[buffer_offset++] = CAST(byte) ((sample >> 8) + 128); \
break; \
case ASAP_FORMAT_S16_LE: \
buffer[buffer_offset++] = TO_BYTE(sample); \
buffer[buffer_offset++] = TO_BYTE(sample >> 8); \
break; \
case ASAP_FORMAT_S16_BE: \
buffer[buffer_offset++] = TO_BYTE(sample >> 8); \
buffer[buffer_offset++] = TO_BYTE(sample); \
break; \
}
STORE_SAMPLE;
if (ast _ extra_pokey_mask != 0) {
acc_right += ast _ extra_pokey.delta_buffer[i] - (acc_right * 3 >> 10);
sample = acc_right >> 10;
STORE_SAMPLE;
}
#endif /* ACTIONSCRIPT */
}
if (i == ast _ samples) {
acc_left += ast _ base_pokey.delta_buffer[i];
acc_right += ast _ extra_pokey.delta_buffer[i];
}
ast _ sample_index = i;
ast _ iir_acc_left = acc_left;
ast _ iir_acc_right = acc_right;
#ifdef APOKEYSND
return buffer_offset;
#else
return blocks;
#endif
}
FUNC(abool, PokeySound_IsSilent, (P(CONST PokeyState PTR, pst)))
{
return ((pst _ audc1 | pst _ audc2 | pst _ audc3 | pst _ audc4) & 0xf) == 0;
}
FUNC(void, PokeySound_Mute, (P(CONST ASAP_State PTR, ast), P(PokeyState PTR, pst), P(int, mask)))
{
MUTE_CHANNEL(1, (mask & 1) != 0, MUTE_USER);
MUTE_CHANNEL(2, (mask & 2) != 0, MUTE_USER);
MUTE_CHANNEL(3, (mask & 4) != 0, MUTE_USER);
MUTE_CHANNEL(4, (mask & 8) != 0, MUTE_USER);
}
#ifdef APOKEYSND
static ASAP_State asap;
__declspec(dllexport) void APokeySound_Initialize(abool stereo)
{
asap.extra_pokey_mask = stereo ? 0x10 : 0;
PokeySound_Initialize(&asap);
PokeySound_Mute(&asap, &asap.base_pokey, 0);
PokeySound_Mute(&asap, &asap.extra_pokey, 0);
PokeySound_StartFrame(&asap);
}
__declspec(dllexport) void APokeySound_PutByte(int addr, int data)
{
PokeySound_PutByte(&asap, addr, data);
}
__declspec(dllexport) int APokeySound_GetRandom(int addr, int cycle)
{
return PokeySound_GetRandom(&asap, addr, cycle);
}
__declspec(dllexport) int APokeySound_Generate(int cycles, byte buffer[], ASAP_SampleFormat format)
{
int len;
PokeySound_EndFrame(&asap, cycles);
len = PokeySound_Generate(&asap, buffer, 0, asap.samples, format);
PokeySound_StartFrame(&asap);
return len;
}
__declspec(dllexport) void APokeySound_About(const char **name, const char **author, const char **description)
{
*name = "Another POKEY sound emulator, v" ASAP_VERSION;
*author = "Piotr Fusik, (C) " ASAP_YEARS;
*description = "Part of ASAP, http://asap.sourceforge.net";
}
#endif /* APOKEYSND */