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asap.c
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asap.c
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/*
* asap.c - ASAP engine
*
* Copyright (C) 2005-2009 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"
FUNC(int, ASAP_GetByte, (P(ASAP_State PTR, ast), P(int, addr)))
{
switch (addr & 0xff0f) {
case 0xd20a:
return PokeySound_GetRandom(ast, addr, ast _ cycle);
case 0xd20e:
if ((addr & ast _ extra_pokey_mask) != 0) {
/* interrupts in the extra POKEY not emulated at the moment */
return 0xff;
}
return ast _ irqst;
case 0xd20f:
/* just because some SAP files rely on this */
return 0xff;
case 0xd40b:
return ast _ scanline_number >> 1;
default:
return dGetByte(addr);
}
}
FUNC(void, ASAP_PutByte, (P(ASAP_State PTR, ast), P(int, addr), P(int, data)))
{
if ((addr >> 8) == 0xd2) {
if ((addr & (ast _ extra_pokey_mask + 0xf)) == 0xe) {
ast _ irqst |= data ^ 0xff;
#define SET_TIMER_IRQ(ch) \
if ((data & ast _ irqst & ch) != 0) { \
if (ast _ timer##ch##_cycle == NEVER) { \
V(int, t) = ast _ base_pokey.tick_cycle##ch; \
while (t < ast _ cycle) \
t += ast _ base_pokey.period_cycles##ch; \
ast _ timer##ch##_cycle = t; \
if (ast _ nearest_event_cycle > t) \
ast _ nearest_event_cycle = t; \
} \
} \
else \
ast _ timer##ch##_cycle = NEVER;
SET_TIMER_IRQ(1);
SET_TIMER_IRQ(2);
SET_TIMER_IRQ(4);
}
else
PokeySound_PutByte(ast, addr, data);
}
else if ((addr & 0xff0f) == 0xd40a) {
if (ast _ cycle <= ast _ next_scanline_cycle - 8)
ast _ cycle = ast _ next_scanline_cycle - 8;
else
ast _ cycle = ast _ next_scanline_cycle + 106;
}
else if ((addr & 0xff00) == ast _ module_info.covox_addr) {
V(PokeyState PTR, pst);
addr &= 3;
if (addr == 0 || addr == 3)
pst = ADDRESSOF ast _ base_pokey;
else
pst = ADDRESSOF ast _ extra_pokey;
pst _ delta_buffer[CYCLE_TO_SAMPLE(ast _ cycle)] += (data - UBYTE(ast _ covox[addr])) << DELTA_SHIFT_COVOX;
ast _ covox[addr] = CAST(byte) (data);
}
else if ((addr & 0xff1f) == 0xd01f) {
V(int, sample) = CYCLE_TO_SAMPLE(ast _ cycle);
V(int, delta);
data &= 8;
/* NOT data - ast _ consol; reverse to the POKEY sound */
delta = (ast _ consol - data) << DELTA_SHIFT_GTIA;
ast _ consol = data;
ast _ base_pokey.delta_buffer[sample] += delta;
ast _ extra_pokey.delta_buffer[sample] += delta;
}
else
dPutByte(addr, data);
}
#define UWORD(array, index) (UBYTE(array[index]) + (UBYTE(array[(index) + 1]) << 8))
#ifndef ASAP_ONLY_SAP
#if !defined(JAVA) && !defined(CSHARP)
#include "players.h"
#endif
#define CMR_BASS_TABLE_OFFSET 0x70f
CONST_ARRAY(byte, cmr_bass_table)
0x5C, 0x56, 0x50, 0x4D, 0x47, 0x44, 0x41, 0x3E,
0x38, 0x35, CAST(byte) (0x88), 0x7F, 0x79, 0x73, 0x6C, 0x67,
0x60, 0x5A, 0x55, 0x51, 0x4C, 0x48, 0x43, 0x3F,
0x3D, 0x39, 0x34, 0x33, 0x30, 0x2D, 0x2A, 0x28,
0x25, 0x24, 0x21, 0x1F, 0x1E
END_CONST_ARRAY;
CONST_ARRAY(int, perframe2fastplay)
312, 312 / 2, 312 / 3, 312 / 4
END_CONST_ARRAY;
/* Loads native module (anything except SAP) and 6502 player routine. */
PRIVATE FUNC(abool, load_native, (
P(ASAP_State PTR, ast), P(ASAP_ModuleInfo PTR, module_info),
P(CONST BYTEARRAY, module), P(int, module_len), P(RESOURCE, player)))
{
#ifdef JAVA
InputStream playerStream = ASAP.class.getResourceAsStream(player);
#define READ_BYTE read
#define READ_ARRAY read
try
#elif defined(CSHARP)
Stream playerStream = System.Reflection.Assembly.GetExecutingAssembly().GetManifestResourceStream(player);
#define READ_BYTE ReadByte
#define READ_ARRAY Read
try
#endif
{
V(int, player_last_byte);
V(int, music_last_byte);
V(int, block_len);
if ((UBYTE(module[0]) != 0xff || UBYTE(module[1]) != 0xff)
&& (module[0] != 0 || module[1] != 0)) /* some CMC and clones start with zeros */
return FALSE;
#if defined(JAVA) || defined(CSHARP)
playerStream.READ_BYTE();
playerStream.READ_BYTE();
module_info _ player = playerStream.READ_BYTE();
module_info _ player += playerStream.READ_BYTE() << 8;
player_last_byte = playerStream.READ_BYTE();
player_last_byte += playerStream.READ_BYTE() << 8;
#else
module_info _ player = UWORD(player, 2);
player_last_byte = UWORD(player, 4);
#endif
module_info _ music = UWORD(module, 2);
if (module_info _ music <= player_last_byte)
return FALSE;
music_last_byte = UWORD(module, 4);
if (module_info _ music <= 0xd7ff && music_last_byte >= 0xd000)
return FALSE;
block_len = music_last_byte + 1 - module_info _ music;
if (6 + block_len != module_len) {
V(int, info_addr);
V(int, info_len);
if (module_info _ type != ASAP_TYPE_RMT || 11 + block_len > module_len)
return FALSE;
/* allow optional info for Raster Music Tracker */
info_addr = UWORD(module, 6 + block_len);
if (info_addr != module_info _ music + block_len)
return FALSE;
info_len = UWORD(module, 8 + block_len) + 1 - info_addr;
if (10 + block_len + info_len != module_len)
return FALSE;
}
if (ast != NULL) {
COPY_ARRAY(ast _ memory, module_info _ music, module, 6, block_len);
#if defined(JAVA) || defined(CSHARP)
int addr = module_info _ player;
do {
int i = playerStream.READ_ARRAY(ast _ memory, addr, player_last_byte + 1 - addr);
if (i <= 0)
throw new IOException();
addr += i;
} while (addr <= player_last_byte);
#else
COPY_ARRAY(ast _ memory, module_info _ player, player, 6, player_last_byte + 1 - module_info _ player);
#endif
}
return TRUE;
}
#ifdef JAVA
catch (IOException e) {
throw new RuntimeException();
}
finally {
try {
playerStream.close();
} catch (IOException e) {
throw new RuntimeException();
}
}
#elif defined(CSHARP)
finally {
playerStream.Close();
}
#endif
}
PRIVATE FUNC(void, set_song_duration, (P(ASAP_ModuleInfo PTR, module_info), P(int, player_calls)))
{
module_info _ durations[module_info _ songs] = TO_INT(player_calls * module_info _ fastplay * 114000.0 / 1773447);
module_info _ songs++;
}
#define SEEN_THIS_CALL 1
#define SEEN_BEFORE 2
#define SEEN_REPEAT 3
PRIVATE FUNC(void, parse_cmc_song, (P(ASAP_ModuleInfo PTR, module_info), P(CONST BYTEARRAY, module), P(int, pos)))
{
V(int, tempo) = UBYTE(module[0x19]);
V(int, player_calls) = 0;
V(int, rep_start_pos) = 0;
V(int, rep_end_pos) = 0;
V(int, rep_times) = 0;
NEW_ARRAY(byte, seen, 0x55);
INIT_ARRAY(seen);
while (pos >= 0 && pos < 0x55) {
V(int, p1);
V(int, p2);
V(int, p3);
if (pos == rep_end_pos && rep_times > 0) {
for (p1 = 0; p1 < 0x55; p1++)
if (seen[p1] == SEEN_THIS_CALL || seen[p1] == SEEN_REPEAT)
seen[p1] = 0;
rep_times--;
pos = rep_start_pos;
}
if (seen[pos] != 0) {
if (seen[pos] != SEEN_THIS_CALL)
module_info _ loops[module_info _ songs] = TRUE;
break;
}
seen[pos] = SEEN_THIS_CALL;
p1 = UBYTE(module[0x206 + pos]);
p2 = UBYTE(module[0x25b + pos]);
p3 = UBYTE(module[0x2b0 + pos]);
if (p1 == 0xfe || p2 == 0xfe || p3 == 0xfe) {
pos++;
continue;
}
p1 >>= 4;
if (p1 == 8)
break;
if (p1 == 9) {
pos = p2;
continue;
}
if (p1 == 0xa) {
pos -= p2;
continue;
}
if (p1 == 0xb) {
pos += p2;
continue;
}
if (p1 == 0xc) {
tempo = p2;
pos++;
continue;
}
if (p1 == 0xd) {
pos++;
rep_start_pos = pos;
rep_end_pos = pos + p2;
rep_times = p3 - 1;
continue;
}
if (p1 == 0xe) {
module_info _ loops[module_info _ songs] = TRUE;
break;
}
p2 = rep_times > 0 ? SEEN_REPEAT : SEEN_BEFORE;
for (p1 = 0; p1 < 0x55; p1++)
if (seen[p1] == SEEN_THIS_CALL)
seen[p1] = CAST(byte) p2;
player_calls += tempo * (module_info _ type == ASAP_TYPE_CM3 ? 48 : 64);
pos++;
}
set_song_duration(module_info, player_calls);
}
PRIVATE FUNC(void, parse_cmc_songs, (P(ASAP_ModuleInfo PTR, module_info), P(CONST BYTEARRAY, module)))
{
V(int, last_pos);
V(int, pos);
last_pos = 0x54;
while (--last_pos >= 0) {
if (UBYTE(module[0x206 + last_pos]) < 0xb0
|| UBYTE(module[0x25b + last_pos]) < 0x40
|| UBYTE(module[0x2b0 + last_pos]) < 0x40)
break;
if (module_info _ channels == 2) {
if (UBYTE(module[0x306 + last_pos]) < 0xb0
|| UBYTE(module[0x35b + last_pos]) < 0x40
|| UBYTE(module[0x3b0 + last_pos]) < 0x40)
break;
}
}
module_info _ songs = 0;
parse_cmc_song(module_info, module, 0);
for (pos = 0; pos < last_pos && module_info _ songs < ASAP_SONGS_MAX; pos++)
if (UBYTE(module[0x206 + pos]) == 0x8f || UBYTE(module[0x206 + pos]) == 0xef)
parse_cmc_song(module_info, module, pos + 1);
}
PRIVATE FUNC(abool, parse_cmc, (
P(ASAP_State PTR, ast), P(ASAP_ModuleInfo PTR, module_info),
P(CONST BYTEARRAY, module), P(int, module_len), P(int, type)))
{
if (module_len < 0x306)
return FALSE;
module_info _ type = type;
if (!load_native(ast, module_info, module, module_len, GET_RESOURCE(cmc, obx)))
return FALSE;
if (ast != NULL && type == ASAP_TYPE_CMR)
COPY_ARRAY(ast _ memory, 0x500 + CMR_BASS_TABLE_OFFSET, cmr_bass_table, 0, sizeof(cmr_bass_table));
parse_cmc_songs(module_info, module);
return TRUE;
}
PRIVATE FUNC(abool, parse_cm3, (
P(ASAP_State PTR, ast), P(ASAP_ModuleInfo PTR, module_info),
P(CONST BYTEARRAY, module), P(int, module_len)))
{
if (module_len < 0x306)
return FALSE;
module_info _ type = ASAP_TYPE_CM3;
if (!load_native(ast, module_info, module, module_len, GET_RESOURCE(cm3, obx)))
return FALSE;
parse_cmc_songs(module_info, module);
return TRUE;
}
PRIVATE FUNC(abool, parse_cms, (
P(ASAP_State PTR, ast), P(ASAP_ModuleInfo PTR, module_info),
P(CONST BYTEARRAY, module), P(int, module_len)))
{
if (module_len < 0x406)
return FALSE;
module_info _ type = ASAP_TYPE_CMS;
module_info _ channels = 2;
if (!load_native(ast, module_info, module, module_len, GET_RESOURCE(cms, obx)))
return FALSE;
parse_cmc_songs(module_info, module);
return TRUE;
}
PRIVATE FUNC(abool, is_dlt_track_empty, (P(CONST BYTEARRAY, module), P(int, pos)))
{
return UBYTE(module[0x2006 + pos]) >= 0x43
&& UBYTE(module[0x2106 + pos]) >= 0x40
&& UBYTE(module[0x2206 + pos]) >= 0x40
&& UBYTE(module[0x2306 + pos]) >= 0x40;
}
PRIVATE FUNC(abool, is_dlt_pattern_end, (P(CONST BYTEARRAY, module), P(int, pos), P(int, i)))
{
V(int, ch);
for (ch = 0; ch < 4; ch++) {
V(int, pattern) = UBYTE(module[0x2006 + (ch << 8) + pos]);
if (pattern < 64) {
V(int, offset) = 6 + (pattern << 7) + (i << 1);
if ((module[offset] & 0x80) == 0 && (module[offset + 1] & 0x80) != 0)
return TRUE;
}
}
return FALSE;
}
PRIVATE FUNC(void, parse_dlt_song, (
P(ASAP_ModuleInfo PTR, module_info), P(CONST BYTEARRAY, module),
P(BOOLARRAY, seen), P(int, pos)))
{
V(int, player_calls) = 0;
V(abool, loop) = FALSE;
V(int, tempo) = 6;
while (pos < 128 && !seen[pos] && is_dlt_track_empty(module, pos))
seen[pos++] = TRUE;
module_info _ song_pos[module_info _ songs] = CAST(byte) pos;
while (pos < 128) {
V(int, p1);
if (seen[pos]) {
loop = TRUE;
break;
}
seen[pos] = TRUE;
p1 = module[0x2006 + pos];
if (p1 == 0x40 || is_dlt_track_empty(module, pos))
break;
if (p1 == 0x41)
pos = UBYTE(module[0x2086 + pos]);
else if (p1 == 0x42)
tempo = UBYTE(module[0x2086 + pos++]);
else {
V(int, i);
for (i = 0; i < 64 && !is_dlt_pattern_end(module, pos, i); i++)
player_calls += tempo;
pos++;
}
}
if (player_calls > 0) {
module_info _ loops[module_info _ songs] = loop;
set_song_duration(module_info, player_calls);
}
}
PRIVATE FUNC(abool, parse_dlt, (
P(ASAP_State PTR, ast), P(ASAP_ModuleInfo PTR, module_info),
P(CONST BYTEARRAY, module), P(int, module_len)))
{
V(int, pos);
NEW_ARRAY(abool, seen, 128);
if (module_len == 0x2c06) {
if (ast != NULL)
ast _ memory[0x4c00] = 0;
}
else if (module_len != 0x2c07)
return FALSE;
module_info _ type = ASAP_TYPE_DLT;
if (!load_native(ast, module_info, module, module_len, GET_RESOURCE(dlt, obx))
|| module_info _ music != 0x2000) {
return FALSE;
}
INIT_ARRAY(seen);
module_info _ songs = 0;
for (pos = 0; pos < 128 && module_info _ songs < ASAP_SONGS_MAX; pos++) {
if (!seen[pos])
parse_dlt_song(module_info, module, seen, pos);
}
return module_info _ songs > 0;
}
PRIVATE FUNC(void, parse_mpt_song, (
P(ASAP_ModuleInfo PTR, module_info), P(CONST BYTEARRAY, module),
P(BOOLARRAY, global_seen), P(int, song_len), P(int, pos)))
{
V(int, addr_to_offset) = UWORD(module, 2) - 6;
V(int, tempo) = UBYTE(module[0x1cf]);
V(int, player_calls) = 0;
NEW_ARRAY(byte, seen, 256);
NEW_ARRAY(int, pattern_offset, 4);
NEW_ARRAY(int, blank_rows, 4);
NEW_ARRAY(int, blank_rows_counter, 4);
INIT_ARRAY(seen);
INIT_ARRAY(blank_rows);
while (pos < song_len) {
V(int, i);
V(int, ch);
V(int, pattern_rows);
if (seen[pos] != 0) {
if (seen[pos] != SEEN_THIS_CALL)
module_info _ loops[module_info _ songs] = TRUE;
break;
}
seen[pos] = SEEN_THIS_CALL;
global_seen[pos] = TRUE;
i = UBYTE(module[0x1d0 + pos * 2]);
if (i == 0xff) {
pos = UBYTE(module[0x1d1 + pos * 2]);
continue;
}
for (ch = 3; ch >= 0; ch--) {
i = UBYTE(module[0x1c6 + ch]) + (UBYTE(module[0x1ca + ch]) << 8) - addr_to_offset;
i = UBYTE(module[i + pos * 2]);
if (i >= 0x40)
break;
i <<= 1;
i = UWORD(module, 0x46 + i);
pattern_offset[ch] = i == 0 ? 0 : i - addr_to_offset;
blank_rows_counter[ch] = 0;
}
if (ch >= 0)
break;
for (i = 0; i < song_len; i++)
if (seen[i] == SEEN_THIS_CALL)
seen[i] = SEEN_BEFORE;
for (pattern_rows = UBYTE(module[0x1ce]); --pattern_rows >= 0; ) {
for (ch = 3; ch >= 0; ch--) {
if (pattern_offset[ch] == 0 || --blank_rows_counter[ch] >= 0)
continue;
for (;;) {
i = UBYTE(module[pattern_offset[ch]++]);
if (i < 0x40 || i == 0xfe)
break;
if (i < 0x80)
continue;
if (i < 0xc0) {
blank_rows[ch] = i - 0x80;
continue;
}
if (i < 0xd0)
continue;
if (i < 0xe0) {
tempo = i - 0xcf;
continue;
}
pattern_rows = 0;
}
blank_rows_counter[ch] = blank_rows[ch];
}
player_calls += tempo;
}
pos++;
}
if (player_calls > 0)
set_song_duration(module_info, player_calls);
}
PRIVATE FUNC(abool, parse_mpt, (
P(ASAP_State PTR, ast), P(ASAP_ModuleInfo PTR, module_info),
P(CONST BYTEARRAY, module), P(int, module_len)))
{
V(int, track0_addr);
V(int, pos);
V(int, song_len);
/* seen[i] == TRUE if the track position i has been processed */
NEW_ARRAY(abool, global_seen, 256);
if (module_len < 0x1d0)
return FALSE;
module_info _ type = ASAP_TYPE_MPT;
if (!load_native(ast, module_info, module, module_len, GET_RESOURCE(mpt, obx)))
return FALSE;
track0_addr = UWORD(module, 2) + 0x1ca;
if (UBYTE(module[0x1c6]) + (UBYTE(module[0x1ca]) << 8) != track0_addr)
return FALSE;
/* Calculate the length of the first track. Address of the second track minus
address of the first track equals the length of the first track in bytes.
Divide by two to get number of track positions. */
song_len = (UBYTE(module[0x1c7]) + (UBYTE(module[0x1cb]) << 8) - track0_addr) >> 1;
if (song_len > 0xfe)
return FALSE;
INIT_ARRAY(global_seen);
module_info _ songs = 0;
for (pos = 0; pos < song_len && module_info _ songs < ASAP_SONGS_MAX; pos++) {
if (!global_seen[pos]) {
module_info _ song_pos[module_info _ songs] = CAST(byte) pos;
parse_mpt_song(module_info, module, global_seen, song_len, pos);
}
}
return module_info _ songs > 0;
}
CONST_ARRAY(byte, rmt_volume_silent)
16, 8, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1
END_CONST_ARRAY;
PRIVATE FUNC(int, rmt_instrument_frames, (
P(CONST BYTEARRAY, module), P(int, instrument),
P(int, volume), P(int, volume_frame), P(abool, extra_pokey)))
{
V(int, addr_to_offset) = UWORD(module, 2) - 6;
V(int, per_frame) = module[0xc];
V(int, player_call);
V(int, player_calls);
V(int, index);
V(int, index_end);
V(int, index_loop);
V(int, volume_slide_depth);
V(int, volume_min);
V(int, volume_slide);
V(abool, silent_loop);
instrument = UWORD(module, 0xe) - addr_to_offset + (instrument << 1);
if (module[instrument + 1] == 0)
return 0;
instrument = UWORD(module, instrument) - addr_to_offset;
player_calls = player_call = volume_frame * per_frame;
index = UBYTE(module[instrument]) + 1 + player_call * 3;
index_end = UBYTE(module[instrument + 2]) + 3;
index_loop = UBYTE(module[instrument + 3]);
if (index_loop >= index_end)
return 0; /* error */
volume_slide_depth = UBYTE(module[instrument + 6]);
volume_min = UBYTE(module[instrument + 7]);
if (index >= index_end)
index = (index - index_end) % (index_end - index_loop) + index_loop;
else {
do {
V(int, vol) = module[instrument + index];
if (extra_pokey)
vol >>= 4;
if ((vol & 0xf) >= rmt_volume_silent[volume])
player_calls = player_call + 1;
player_call++;
index += 3;
} while (index < index_end);
}
if (volume_slide_depth == 0)
return player_calls / per_frame;
volume_slide = 128;
silent_loop = FALSE;
for (;;) {
V(int, vol);
if (index >= index_end) {
if (silent_loop)
break;
silent_loop = TRUE;
index = index_loop;
}
vol = module[instrument + index];
if (extra_pokey)
vol >>= 4;
if ((vol & 0xf) >= rmt_volume_silent[volume]) {
player_calls = player_call + 1;
silent_loop = FALSE;
}
player_call++;
index += 3;
volume_slide -= volume_slide_depth;
if (volume_slide < 0) {
volume_slide += 256;
if (--volume <= volume_min)
break;
}
}
return player_calls / per_frame;
}
PRIVATE FUNC(void, parse_rmt_song, (
P(ASAP_ModuleInfo PTR, module_info), P(CONST BYTEARRAY, module),
P(BOOLARRAY, global_seen), P(int, song_len), P(int, pos_shift), P(int, pos)))
{
V(int, ch);
V(int, addr_to_offset) = UWORD(module, 2) - 6;
V(int, tempo) = UBYTE(module[0xb]);
V(int, frames) = 0;
V(int, song_offset) = UWORD(module, 0x14) - addr_to_offset;
V(int, pattern_lo_offset) = UWORD(module, 0x10) - addr_to_offset;
V(int, pattern_hi_offset) = UWORD(module, 0x12) - addr_to_offset;
V(int, instrument_frames);
NEW_ARRAY(byte, seen, 256);
NEW_ARRAY(int, pattern_begin, 8);
NEW_ARRAY(int, pattern_offset, 8);
NEW_ARRAY(int, blank_rows, 8);
NEW_ARRAY(int, instrument_no, 8);
NEW_ARRAY(int, instrument_frame, 8);
NEW_ARRAY(int, volume_value, 8);
NEW_ARRAY(int, volume_frame, 8);
INIT_ARRAY(seen);
INIT_ARRAY(instrument_no);
INIT_ARRAY(instrument_frame);
INIT_ARRAY(volume_value);
INIT_ARRAY(volume_frame);
while (pos < song_len) {
V(int, i);
V(int, pattern_rows);
if (seen[pos] != 0) {
if (seen[pos] != SEEN_THIS_CALL)
module_info _ loops[module_info _ songs] = TRUE;
break;
}
seen[pos] = SEEN_THIS_CALL;
global_seen[pos] = TRUE;
if (UBYTE(module[song_offset + (pos << pos_shift)]) == 0xfe) {
pos = UBYTE(module[song_offset + (pos << pos_shift) + 1]);
continue;
}
for (ch = 0; ch < 1 << pos_shift; ch++) {
i = UBYTE(module[song_offset + (pos << pos_shift) + ch]);
if (i == 0xff)
blank_rows[ch] = 256;
else {
pattern_offset[ch] = pattern_begin[ch] = UBYTE(module[pattern_lo_offset + i])
+ (UBYTE(module[pattern_hi_offset + i]) << 8) - addr_to_offset;
blank_rows[ch] = 0;
}
}
for (i = 0; i < song_len; i++)
if (seen[i] == SEEN_THIS_CALL)
seen[i] = SEEN_BEFORE;
for (pattern_rows = UBYTE(module[0xa]); --pattern_rows >= 0; ) {
for (ch = 0; ch < 1 << pos_shift; ch++) {
if (--blank_rows[ch] > 0)
continue;
for (;;) {
i = UBYTE(module[pattern_offset[ch]++]);
if ((i & 0x3f) < 62) {
i += UBYTE(module[pattern_offset[ch]++]) << 8;
if ((i & 0x3f) != 61) {
instrument_no[ch] = i >> 10;
instrument_frame[ch] = frames;
}
volume_value[ch] = (i >> 6) & 0xf;
volume_frame[ch] = frames;
break;
}
if (i == 62) {
blank_rows[ch] = UBYTE(module[pattern_offset[ch]++]);
break;
}
if ((i & 0x3f) == 62) {
blank_rows[ch] = i >> 6;
break;
}
if ((i & 0xbf) == 63) {
tempo = UBYTE(module[pattern_offset[ch]++]);
continue;
}
if (i == 0xbf) {
pattern_offset[ch] = pattern_begin[ch] + UBYTE(module[pattern_offset[ch]]);
continue;
}
/* assert(i == 0xff); */
pattern_rows = -1;
break;
}
if (pattern_rows < 0)
break;
}
if (pattern_rows >= 0)
frames += tempo;
}
pos++;
}
instrument_frames = 0;
for (ch = 0; ch < 1 << pos_shift; ch++) {
V(int, frame) = instrument_frame[ch];
frame += rmt_instrument_frames(module, instrument_no[ch], volume_value[ch], volume_frame[ch] - frame, ch >= 4);
if (instrument_frames < frame)
instrument_frames = frame;
}
if (frames > instrument_frames) {
if (frames - instrument_frames > 100)
module_info _ loops[module_info _ songs] = FALSE;
frames = instrument_frames;
}
if (frames > 0)
set_song_duration(module_info, frames);
}
PRIVATE FUNC(abool, parse_rmt, (
P(ASAP_State PTR, ast), P(ASAP_ModuleInfo PTR, module_info),
P(CONST BYTEARRAY, module), P(int, module_len)))
{
V(int, per_frame);
V(int, pos_shift);
V(int, song_len);
V(int, pos);
NEW_ARRAY(abool, global_seen, 256);
if (module_len < 0x30 || module[6] != CHARCODE('R') || module[7] != CHARCODE('M')
|| module[8] != CHARCODE('T') || module[0xd] != 1)
return FALSE;
switch (CAST(char) module[9]) {
case CHARCODE('4'):
pos_shift = 2;
break;
case CHARCODE('8'):
module_info _ channels = 2;
pos_shift = 3;
break;
default:
return FALSE;
}
per_frame = module[0xc];
if (per_frame < 1 || per_frame > 4)
return FALSE;
module_info _ type = ASAP_TYPE_RMT;
if (!load_native(ast, module_info, module, module_len,
module_info _ channels == 2 ? GET_RESOURCE(rmt8, obx) : GET_RESOURCE(rmt4, obx)))
return FALSE;
song_len = UWORD(module, 4) + 1 - UWORD(module, 0x14);
if (pos_shift == 3 && (song_len & 4) != 0
&& UBYTE(module[6 + UWORD(module, 4) - UWORD(module, 2) - 3]) == 0xfe)
song_len += 4;
song_len >>= pos_shift;
if (song_len >= 0x100)
return FALSE;
INIT_ARRAY(global_seen);
module_info _ songs = 0;
for (pos = 0; pos < song_len && module_info _ songs < ASAP_SONGS_MAX; pos++) {
if (!global_seen[pos]) {
module_info _ song_pos[module_info _ songs] = CAST(byte) pos;
parse_rmt_song(module_info, module, global_seen, song_len, pos_shift, pos);
}
}
/* must set fastplay after song durations calculations, so they assume 312 */
module_info _ fastplay = perframe2fastplay[per_frame - 1];
module_info _ player = 0x600;
return module_info _ songs > 0;
}
PRIVATE FUNC(void, parse_tmc_song, (
P(ASAP_ModuleInfo PTR, module_info), P(CONST BYTEARRAY, module), P(int, pos)))
{
V(int, addr_to_offset) = UWORD(module, 2) - 6;
V(int, tempo) = UBYTE(module[0x24]) + 1;
V(int, frames) = 0;
NEW_ARRAY(int, pattern_offset, 8);
NEW_ARRAY(int, blank_rows, 8);
while (UBYTE(module[0x1a6 + 15 + pos]) < 0x80) {
V(int, ch);
V(int, pattern_rows);
for (ch = 7; ch >= 0; ch--) {
V(int, pat) = UBYTE(module[0x1a6 + 15 + pos - 2 * ch]);
pattern_offset[ch] = UBYTE(module[0xa6 + pat]) + (UBYTE(module[0x126 + pat]) << 8) - addr_to_offset;
blank_rows[ch] = 0;
}
for (pattern_rows = 64; --pattern_rows >= 0; ) {
for (ch = 7; ch >= 0; ch--) {
if (--blank_rows[ch] >= 0)
continue;
for (;;) {
V(int, i) = UBYTE(module[pattern_offset[ch]++]);
if (i < 0x40) {
pattern_offset[ch]++;
break;
}
if (i == 0x40) {
i = UBYTE(module[pattern_offset[ch]++]);
if ((i & 0x7f) == 0)
pattern_rows = 0;
else
tempo = (i & 0x7f) + 1;
if (i >= 0x80)
pattern_offset[ch]++;
break;
}
if (i < 0x80) {
i = module[pattern_offset[ch]++] & 0x7f;
if (i == 0)
pattern_rows = 0;
else
tempo = i + 1;
pattern_offset[ch]++;
break;
}
if (i < 0xc0)
continue;
blank_rows[ch] = i - 0xbf;
break;
}
}
frames += tempo;
}
pos += 16;
}
if (UBYTE(module[0x1a6 + 14 + pos]) < 0x80)
module_info _ loops[module_info _ songs] = TRUE;
set_song_duration(module_info, frames);
}
PRIVATE FUNC(abool, parse_tmc, (
P(ASAP_State PTR, ast), P(ASAP_ModuleInfo PTR, module_info),
P(CONST BYTEARRAY, module), P(int, module_len)))
{
V(int, i);
V(int, last_pos);
if (module_len < 0x1d0)
return FALSE;
module_info _ type = ASAP_TYPE_TMC;
if (!load_native(ast, module_info, module, module_len, GET_RESOURCE(tmc, obx)))
return FALSE;
module_info _ channels = 2;
i = 0;
/* find first instrument */
while (module[0x66 + i] == 0) {
if (++i >= 64)
return FALSE; /* no instrument */
}
last_pos = (UBYTE(module[0x66 + i]) << 8) + UBYTE(module[0x26 + i])
- UWORD(module, 2) - 0x1b0;
if (0x1b5 + last_pos >= module_len)
return FALSE;
/* skip trailing jumps */
do {
if (last_pos <= 0)
return FALSE; /* no pattern to play */
last_pos -= 16;
} while (UBYTE(module[0x1b5 + last_pos]) >= 0x80);
module_info _ songs = 0;
parse_tmc_song(module_info, module, 0);
for (i = 0; i < last_pos && module_info _ songs < ASAP_SONGS_MAX; i += 16)
if (UBYTE(module[0x1b5 + i]) >= 0x80)
parse_tmc_song(module_info, module, i + 16);
/* must set fastplay after song durations calculations, so they assume 312 */
i = module[0x25];
if (i < 1 || i > 4)
return FALSE;
if (ast != NULL)
ast _ tmc_per_frame = module[0x25];
module_info _ fastplay = perframe2fastplay[i - 1];
return TRUE;
}
PRIVATE FUNC(void, parse_tm2_song, (
P(ASAP_ModuleInfo PTR, module_info), P(CONST BYTEARRAY, module), P(int, pos)))
{
V(int, addr_to_offset) = UWORD(module, 2) - 6;
V(int, tempo) = UBYTE(module[0x24]) + 1;
V(int, player_calls) = 0;
NEW_ARRAY(int, pattern_offset, 8);
NEW_ARRAY(int, blank_rows, 8);
for (;;) {
V(int, ch);
V(int, pattern_rows) = UBYTE(module[0x386 + 16 + pos]);
if (pattern_rows == 0)
break;
if (pattern_rows >= 0x80) {
module_info _ loops[module_info _ songs] = TRUE;
break;
}
for (ch = 7; ch >= 0; ch--) {
V(int, pat) = UBYTE(module[0x386 + 15 + pos - 2 * ch]);
pattern_offset[ch] = UBYTE(module[0x106 + pat]) + (UBYTE(module[0x206 + pat]) << 8) - addr_to_offset;
blank_rows[ch] = 0;
}
while (--pattern_rows >= 0) {
for (ch = 7; ch >= 0; ch--) {
if (--blank_rows[ch] >= 0)
continue;
for (;;) {
V(int, i) = UBYTE(module[pattern_offset[ch]++]);
if (i == 0) {
pattern_offset[ch]++;
break;
}
if (i < 0x40) {
if (UBYTE(module[pattern_offset[ch]++]) >= 0x80)
pattern_offset[ch]++;
break;
}
if (i < 0x80) {
pattern_offset[ch]++;
break;
}
if (i == 0x80) {
blank_rows[ch] = UBYTE(module[pattern_offset[ch]++]);
break;
}
if (i < 0xc0)
break;
if (i < 0xd0) {
tempo = i - 0xbf;
continue;
}
if (i < 0xe0) {
pattern_offset[ch]++;
break;
}
if (i < 0xf0) {
pattern_offset[ch] += 2;
break;
}
if (i < 0xff) {
blank_rows[ch] = i - 0xf0;
break;
}
blank_rows[ch] = 64;
break;
}
}
player_calls += tempo;
}
pos += 17;
}
set_song_duration(module_info, player_calls);
}
PRIVATE FUNC(abool, parse_tm2, (
P(ASAP_State PTR, ast), P(ASAP_ModuleInfo PTR, module_info),
P(CONST BYTEARRAY, module), P(int, module_len)))
{
V(int, i);
V(int, last_pos);
V(int, c);
if (module_len < 0x3a4)
return FALSE;
module_info _ type = ASAP_TYPE_TM2;
if (!load_native(ast, module_info, module, module_len, GET_RESOURCE(tm2, obx)))
return FALSE;
i = module[0x25];
if (i < 1 || i > 4)
return FALSE;
module_info _ fastplay = perframe2fastplay[i - 1];
module_info _ player = 0x500;
if (module[0x1f] != 0)
module_info _ channels = 2;
last_pos = 0xffff;
for (i = 0; i < 0x80; i++) {
V(int, instr_addr) = UBYTE(module[0x86 + i]) + (UBYTE(module[0x306 + i]) << 8);
if (instr_addr != 0 && instr_addr < last_pos)
last_pos = instr_addr;
}
for (i = 0; i < 0x100; i++) {
V(int, pattern_addr) = UBYTE(module[0x106 + i]) + (UBYTE(module[0x206 + i]) << 8);
if (pattern_addr != 0 && pattern_addr < last_pos)
last_pos = pattern_addr;