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JUDASMOD.C
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JUDASMOD.C
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/*
* JUDAS 31-instrument mod loading/playing
*
* Changes:
* V2.02 Removed checking of read error in instrument loading
* Added end > length check in instrument loading. DALLAS.MOD works now!
* V2.03 Removed some weird printf instruction
* Moved tables only used by MODs here
* If there's a volslide with both up & down parameters nonzero must use
* the up parameter only!
* V2.04 Scaled channel default pannings to 1/2 original, no more hurting ears!
* Added panning command "E8?" (Undocumented, but CP supports it)
* Corrected behaviour of instrumentnumber without a note when followed
* by a note without instrumentnumber!
* V2.05 When playing a MOD and there's retrig without note then must ALWAYS
* retrig on tick 0! And E90 mustn't do anything, as well as a notedelay
* without a note!
* Changed also mt_patterns to unsigned because there can actually be
* 256 patterns if the song is saved with FT2 in MOD-format!
* V2.06 Phase of the sine vibrato rotated 180 degrees!
* Corrected behaviour of two pattern breaks on the same row
* Added song looping control. Moving to an already played song position
* is treated as looping. This may cause false alarms in some weird songs.
* Added support for vumeters (smp structure address provided).
* Added support for the more precise volume
* Added song rewinding/forwarding
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <mem.h>
#include "judas.h"
#include "judastbl.h"
#ifdef __DJGPP__
#define HANDLE_PRAGMA_PACK_PUSH_POP 1
#endif
/*
* A useful function by HEADLESS!
*/
#define HEU16_TO_UNSIGNED_SHORT(heu16) (((unsigned short) (heu16).high << 8) | (heu16).low)
#define AMIGA_CLOCK 3579364
#define MOD_INSTRUMENTS 31
#define MOD_MAXLENGTH 128
#define MOD_MAXCHANNELS 32
#define MOD_INFOBLOCK 1084
#define MOD_NAMEOFFSET 0
#define MOD_INSTROFFSET 20
#define MOD_LENGTHOFFSET 950
#define MOD_ORDEROFFSET 952
#define MOD_IDENTOFFSET 1080
/*
* Motorola format 16-bit integer
*/
#pragma pack(push,1)
typedef struct
{
unsigned char high;
unsigned char low;
} HEU16;
/*
* mod identification entry
*/
typedef struct
{
char *string;
int channels;
} MOD_IDENT;
/*
* Converted note structure
*/
typedef struct
{
unsigned char note;
unsigned char instrument;
unsigned char command;
unsigned char data;
} NOTE;
/*
* Mod instrument structure (in Motorola format...)
*/
typedef struct
{
char name[22];
HEU16 length;
unsigned char finetune;
char vol;
HEU16 repeat;
HEU16 replen;
} MOD_INSTRUMENT;
#pragma pack(pop)
/*
* Our instrument structure
*/
typedef struct
{
SAMPLE *smp;
char vol;
unsigned char finetune;
} INSTRUMENT;
/*
* Track structure for mod playing
*/
typedef struct
{
INSTRUMENT *ip;
unsigned char newnote;
unsigned char note;
unsigned char instrument;
unsigned char newinstrument;
unsigned char effect;
unsigned char effectdata;
unsigned char nybble1;
unsigned char nybble2;
unsigned char smp;
signed char finetune;
signed char vol;
short baseperiod;
short period;
short targetperiod;
unsigned char tp;
unsigned char tpspeed;
unsigned char volspeedup;
unsigned char volspeeddown;
unsigned char portaspeedup;
unsigned char portaspeeddown;
unsigned char vibratotype;
unsigned char vibratospeed;
unsigned char vibratodepth;
unsigned char vibratophase;
unsigned char sampleoffset;
unsigned char usesampleoffset;
unsigned char glissando;
unsigned char tremolotype;
unsigned char tremolospeed;
unsigned char tremolodepth;
unsigned char tremolophase;
unsigned char patternloopline;
unsigned char patternloopcount;
unsigned char retrigcount;
} TRACK;
/*
* Prototypes
*/
int judas_loadmod(char *name);
void judas_freemod(void);
void judas_playmod(int rounds);
void judas_stopmod(void);
unsigned char judas_getmodpos(void);
unsigned char judas_getmodline(void);
unsigned char judas_getmodtick(void);
unsigned char judas_getmodchannels(void);
char *judas_getmodname(void);
void judas_forwardmod(void);
void judas_rewindmod(void);
static void judas_mutechannelsmod();
void modplayer(void);
static int init_modplayer(void);
static void modplayer_code_lock_start(void);
static void modplayer_code_lock_end(void);
static void startnewnote(TRACK *tptr, CHANNEL *chptr);
static void extendedcommand(TRACK *tptr, CHANNEL *chptr);
/*
* Mod indentification entries, don't know if anyone writes mods with
* for example 2 channels, but they can be created with FT2!
*/
static MOD_IDENT ident[] =
{
{"2CHN", 2},
{"M.K.", 4},
{"M!K!", 4},
{"4CHN", 4},
{"6CHN", 6},
{"8CHN", 8},
{"10CH", 10},
{"12CH", 12},
{"14CH", 14},
{"16CH", 16},
{"18CH", 18},
{"20CH", 20},
{"22CH", 22},
{"24CH", 24},
{"26CH", 26},
{"28CH", 28},
{"30CH", 30},
{"32CH", 32}
};
/*
* Panning table (AMIGA hardware emulation!)
*/
static int panningtable[] =
{
64, 191, 191, 64
};
/* Period table for MODs, lowest octave (0) with all finetunes */
unsigned short periodtable[16][12] =
{
{6848, 6464, 6096, 5760, 5424, 5120, 4832, 4560, 4304, 4064, 3840, 3624},
{6800, 6416, 6056, 5720, 5392, 5096, 4808, 4536, 4280, 4040, 3816, 3600},
{6752, 6368, 6016, 5672, 5360, 5056, 4776, 4504, 4256, 4016, 3792, 3576},
{6704, 6328, 5968, 5632, 5320, 5024, 4736, 4472, 4224, 3984, 3760, 3552},
{6656, 6280, 5928, 5592, 5280, 4984, 4704, 4440, 4192, 3960, 3736, 3528},
{6608, 6232, 5888, 5552, 5240, 4952, 4672, 4408, 4160, 3928, 3704, 3496},
{6560, 6192, 5840, 5512, 5208, 4912, 4640, 4376, 4128, 3896, 3680, 3472},
{6512, 6144, 5800, 5472, 5168, 4880, 4600, 4344, 4104, 3872, 3656, 3448},
{7256, 6848, 6464, 6096, 5760, 5424, 5120, 4832, 4560, 4304, 4032, 3840},
{7200, 6800, 6416, 6056, 5720, 5400, 5088, 4808, 4536, 4280, 4040, 3816},
{7152, 6752, 6368, 6016, 5672, 5360, 5056, 4776, 4504, 4256, 4016, 3792},
{7096, 6704, 6328, 5968, 5632, 5320, 5024, 4736, 4472, 4224, 3984, 3760},
{7048, 6656, 6280, 5928, 5592, 5280, 4984, 4704, 4440, 4192, 3952, 3736},
{7000, 6608, 6232, 5888, 5552, 5240, 4952, 4672, 4408, 4160, 3928, 3704},
{6944, 6560, 6192, 5840, 5512, 5208, 4912, 4640, 4376, 4128, 3896, 3680},
{6896, 6512, 6144, 5800, 5472, 5168, 4880, 4600, 4344, 4104, 3872, 3656}
};
/* Module infoblock pointer */
static unsigned char *mod_info = NULL;
/* Module patterns pointer */
static unsigned char *mod_patterns = NULL;
/* Module status stuff */
static unsigned char mt_oldpos;
static unsigned char mt_pos;
static unsigned char mt_line;
static unsigned char mt_length;
static unsigned char mt_channels;
static unsigned char mt_ticktempo;
static unsigned char mt_tickcount;
static unsigned char mt_patternbreak;
static unsigned char mt_patterndelay;
static unsigned mt_patterns;
static int mt_patternlength;
static unsigned char *mt_order;
static char *mt_poshasbeenplayed;
static INSTRUMENT instrument[MOD_INSTRUMENTS];
static TRACK track[MOD_MAXCHANNELS];
static char modplayer_firsttime = 1;
static int mt_roundcounter;
static int mt_wind = 0;
static int mt_windingpause = 0;
/* External variables */
extern unsigned char judas_bpmtempo;
extern unsigned judas_bpmcount;
extern void (*judas_player)(void);
void judas_forwardmod(void)
{
mt_wind = 1;
}
void judas_rewindmod(void)
{
mt_wind = -1;
}
int judas_loadmod(char *name)
{
int count;
int handle;
NOTE *destptr;
unsigned char *srcptr;
/* Don't waste memory if Nosound */
judas_error = JUDAS_OK;
if (judas_device == DEV_NOSOUND) return 1;
judas_error = JUDAS_OUT_OF_MEMORY;
if (modplayer_firsttime)
{
if (!init_modplayer()) return 0;
}
/* Unload previous mod */
judas_freemod();
judas_error = JUDAS_OPEN_ERROR;
handle = judas_open(name);
if (handle == -1) return 0;
judas_error = JUDAS_OUT_OF_MEMORY;
/* Get memory for the mod infoblock */
mod_info = locked_malloc(MOD_INFOBLOCK);
if (!mod_info)
{
judas_close(handle);
return 0;
}
judas_error = JUDAS_WRONG_FORMAT;
/* Read the infoblock */
if (judas_read(handle, mod_info, MOD_INFOBLOCK) != MOD_INFOBLOCK)
{
judas_freemod();
judas_close(handle);
return 0;
}
/*
* Clear byte 20 of header to prevent weird shit when printing
* modulename
*/
mod_info[20] = 0;
/* Determine number of channels */
mt_channels = 0;
for (count = 0; count < 18; count++)
{
if (!memcmp(ident[count].string, &mod_info[MOD_IDENTOFFSET], 4))
mt_channels = ident[count].channels;
}
/* If none of these then it's a format we can't handle!!! */
if (!mt_channels)
{
judas_freemod();
judas_close(handle);
return 0;
}
/*
* Check that there aren't too many channels
*/
if (mt_channels > CHANNELS)
{
judas_error = JUDAS_OUT_OF_CHANNELS;
mt_channels = CHANNELS;
judas_freemod();
judas_close(handle);
return 0;
}
/* Calculate patternlength */
mt_patternlength = mt_channels * 256;
/* Now search thru orderlist to find out amount of patterns */
mt_length = mod_info[MOD_LENGTHOFFSET];
mt_order = &mod_info[MOD_ORDEROFFSET];
mt_poshasbeenplayed = locked_malloc(MOD_MAXLENGTH);
if (!mt_poshasbeenplayed) {
judas_freemod();
judas_close(handle);
return 0;
}
mt_patterns = 0;
for (count = 0; count < MOD_MAXLENGTH; count++)
{
if (mt_order[count] > mt_patterns) mt_patterns = mt_order[count];
}
mt_patterns++;
judas_error = JUDAS_OUT_OF_MEMORY;
/* Reserve memory for patterns and load them */
mod_patterns = locked_malloc(mt_patternlength * mt_patterns);
if (!mod_patterns)
{
judas_freemod();
judas_close(handle);
return 0;
}
judas_error = JUDAS_READ_ERROR;
if (judas_read(handle, mod_patterns, mt_patternlength * mt_patterns) != mt_patternlength * mt_patterns)
{
judas_freemod();
judas_close(handle);
return 0;
}
/* Convert patterns into easier-to-read format */
destptr = (NOTE *)mod_patterns;
srcptr = mod_patterns;
for (count = 0; count < mt_patternlength * mt_patterns / 4; count++)
{
/*
* Note: FT2 saves the 13th bit of period into 5th bit of
* samplenumber, and when loading it ofcourse cannot read
* the period back correctly! We don't use the 13th bit!
*/
unsigned short period = ((srcptr[0] & 0x0f) << 8) | srcptr[1];
unsigned char note = 0, instrument, command;
if (period)
{
int findnote;
int offset = 0x7fffffff;
for (findnote = 0; findnote < 96; findnote++)
{
if (abs(period - (periodtable[0][findnote % 12] >> (findnote / 12))) < offset)
{
note = findnote + 1;
offset = abs(period - (periodtable[0][findnote % 12] >> (findnote / 12)));
}
}
}
instrument = (srcptr[0] & 0xf0) | ((srcptr[2] & 0xf0) >> 4);
command = srcptr[2] & 0x0f;
destptr->note = note;
destptr->instrument = instrument;
destptr->command = command;
srcptr += 4;
destptr++;
}
/* Now load instruments */
{
INSTRUMENT *i_ptr = &instrument[0];
MOD_INSTRUMENT *mod_instr_ptr = (MOD_INSTRUMENT *)(&mod_info[MOD_INSTROFFSET]);
for (count = 0; count < MOD_INSTRUMENTS; count++)
{
int length, repeat, end;
unsigned char voicemode;
length = HEU16_TO_UNSIGNED_SHORT(mod_instr_ptr->length) << 1;
repeat = HEU16_TO_UNSIGNED_SHORT(mod_instr_ptr->repeat) << 1;
end = HEU16_TO_UNSIGNED_SHORT(mod_instr_ptr->replen) << 1;
i_ptr->finetune = mod_instr_ptr->finetune;
i_ptr->vol = mod_instr_ptr->vol;
if (length)
{
if (end > 2)
{
voicemode = VM_LOOP | VM_ON;
end += repeat;
if (end > length) end = length;
}
else
{
voicemode = VM_ONESHOT | VM_ON;
end = length;
}
judas_error = JUDAS_OUT_OF_MEMORY;
i_ptr->smp = judas_allocsample(length);
if (!i_ptr->smp)
{
judas_freemod();
judas_close(handle);
return 0;
}
judas_read(handle, i_ptr->smp->start, length);
i_ptr->smp->repeat = i_ptr->smp->start + repeat;
i_ptr->smp->end = i_ptr->smp->start + end;
i_ptr->smp->voicemode = voicemode;
judas_ipcorrect(i_ptr->smp);
}
else
{
i_ptr->smp = NULL;
}
i_ptr++;
mod_instr_ptr++;
}
}
/* Loading done successfully! */
judas_error = JUDAS_OK;
judas_close(handle);
return 1;
}
void judas_freemod(void)
{
int count;
if (modplayer_firsttime)
{
if (!init_modplayer()) return;
}
judas_stopmod();
/* Free infoblock & patterns */
if (mod_info)
{
locked_free(mod_info);
mod_info = NULL;
}
if (mod_patterns)
{
locked_free(mod_patterns);
mod_patterns = NULL;
}
/* Remove all samples used by song */
for (count = 0; count < MOD_INSTRUMENTS; count++)
{
judas_freesample(instrument[count].smp);
instrument[count].smp = NULL;
}
}
unsigned char judas_getmodpos(void)
{
return mt_pos;
}
unsigned char judas_getmodline(void)
{
return mt_line;
}
unsigned char judas_getmodtick(void)
{
return mt_tickcount;
}
unsigned char judas_getmodchannels(void)
{
return mt_channels;
}
char *judas_getmodname(void)
{
if (mod_info) return &mod_info[MOD_NAMEOFFSET];
else return NULL;
}
/*
* This is called the first time when loading or unloading a mod. It clears
* all sample pointers to prevent weird shit and locks all code & data touched
* by the player routine.
*/
static int init_modplayer(void)
{
int count;
mt_channels = 0;
for (count = 0; count < MOD_INSTRUMENTS; count++)
{
instrument[count].smp = NULL;
}
if (!judas_locktables()) return 0;
if (!judas_memlock(&modplayer_code_lock_start, (int)&modplayer_code_lock_end - (int)&modplayer_code_lock_start)) return 0;
if (!judas_memlock(&periodtable[0][0], sizeof periodtable)) return 0;
if (!judas_memlock(&instrument[0], sizeof instrument)) return 0;
if (!judas_memlock(&track[0], sizeof track)) return 0;
if (!judas_memlock(&mod_info, sizeof mod_info)) return 0;
if (!judas_memlock(&mod_patterns, sizeof mod_patterns)) return 0;
if (!judas_memlock(&mt_oldpos, sizeof mt_oldpos)) return 0;
if (!judas_memlock(&mt_pos, sizeof mt_pos)) return 0;
if (!judas_memlock(&mt_line, sizeof mt_line)) return 0;
if (!judas_memlock(&mt_length, sizeof mt_length)) return 0;
if (!judas_memlock(&mt_channels, sizeof mt_channels)) return 0;
if (!judas_memlock(&mt_patterns, sizeof mt_patterns)) return 0;
if (!judas_memlock(&mt_ticktempo, sizeof mt_ticktempo)) return 0;
if (!judas_memlock(&mt_tickcount, sizeof mt_tickcount)) return 0;
if (!judas_memlock(&mt_patternlength, sizeof mt_patternlength)) return 0;
if (!judas_memlock(&mt_order, sizeof mt_order)) return 0;
if (!judas_memlock(&mt_poshasbeenplayed, sizeof mt_poshasbeenplayed)) return 0;
if (!judas_memlock(&mt_patternbreak, sizeof mt_patternbreak)) return 0;
if (!judas_memlock(&mt_patterndelay, sizeof mt_patterndelay)) return 0;
if (!judas_memlock(&mt_roundcounter, sizeof mt_roundcounter)) return 0;
if (!judas_memlock(&mt_wind, sizeof mt_wind)) return 0;
if (!judas_memlock(&mt_windingpause, sizeof mt_windingpause)) return 0;
modplayer_firsttime = 0;
return 1;
}
static void modplayer_code_lock_start(void)
{
}
void judas_mutechannelsmod(void)
{
int count;
TRACK *tptr = &track[0];
CHANNEL *chptr = &judas_channel[0];
for (count = 0; count < mt_channels; count++)
{
chptr->smp = NULL;
chptr->voicemode = VM_OFF;
chptr->vol = 0;
chptr->panning = panningtable[count % 4];
tptr->ip = &instrument[0];
tptr->instrument = 0;
tptr->effect = 0;
tptr->effectdata = 0;
tptr->nybble1 = 0;
tptr->nybble2 = 0;
tptr->tp = 0;
tptr->tpspeed = 0;
tptr->volspeedup = 0;
tptr->volspeeddown = 0;
tptr->glissando = 0;
tptr->patternloopline = 0;
tptr->patternloopcount = 0;
tptr->retrigcount = 0;
tptr->sampleoffset = 0;
tptr->usesampleoffset = 0;
tptr->tremolotype = 0;
tptr->vibratotype = 0;
chptr++;
tptr++;
}
}
void judas_playmod(int rounds)
{
int count;
if (!mod_info) return;
judas_player = NULL;
mt_roundcounter = rounds;
mt_wind = 0;
mt_pos = 0;
mt_line = 0;
mt_tickcount = 0;
mt_ticktempo = 6;
mt_patterndelay = 0;
judas_bpmcount = 0;
judas_bpmtempo = 125;
for (count = 1; count < MOD_MAXLENGTH; count++)
{
mt_poshasbeenplayed[count] = 0;
}
judas_mutechannelsmod();
mt_poshasbeenplayed[0] = 1;
judas_player = &modplayer;
}
void judas_stopmod(void)
{
CHANNEL *chptr = &judas_channel[0];
int count;
if (mt_channels > CHANNELS) mt_channels = CHANNELS;
if (!mod_info) return;
judas_player = NULL;
for (count = 0; count < mt_channels; count++)
{
chptr->voicemode = VM_OFF;
chptr->smp = NULL;
chptr++;
}
}
void modplayer(void)
{
TRACK *tptr = &track[0];
CHANNEL *chptr = &judas_channel[0];
int count;
/*
* Song winding
*/
if (mt_wind > 0) {
mt_wind = 0;
if (mt_pos < mt_length-1) {
int count;
mt_pos++;
mt_oldpos = mt_pos;
mt_line = 0;
mt_tickcount = 0;
mt_patterndelay = 0;
for (count = 0; count < MOD_MAXLENGTH; count++)
{
mt_poshasbeenplayed[count] = 0;
}
mt_poshasbeenplayed[mt_pos] = 1;
judas_mutechannelsmod();
mt_windingpause = 1;
return;
}
} else
if (mt_wind < 0) {
mt_wind = 0;
if (mt_pos > 0) {
int count;
mt_pos--;
mt_oldpos = mt_pos;
mt_line = 0;
mt_tickcount = 0;
mt_patterndelay = 0;
for (count = 0; count < MOD_MAXLENGTH; count++)
{
mt_poshasbeenplayed[count] = 0;
}
mt_poshasbeenplayed[mt_pos] = 1;
judas_mutechannelsmod();
mt_windingpause = 1;
return;
}
}
if (mt_windingpause) {
mt_windingpause = 0;
return;
}
/*
* Set new notes or do something else?
*/
if ((!mt_tickcount) && (!mt_patterndelay))
{
NOTE *noteptr;
/*
* Beware of illegal patternnumbers
*/
if (mt_order[mt_pos] >= mt_patterns) return;
noteptr = (NOTE *)(mod_patterns + mt_order[mt_pos] * mt_patternlength + mt_line * mt_channels * sizeof(NOTE));
mt_patternbreak = 0;
mt_oldpos = mt_pos;
for (count = mt_channels; count > 0; count--)
{
tptr->newnote = 0;
tptr->retrigcount = 0;
/*
* Get note (if any)
*/
if (noteptr->note)
{
tptr->note = noteptr->note - 1;
tptr->newnote = 1;
}
/*
* Get effect, effect data etc.
*/
tptr->effect = noteptr->command;
tptr->effectdata = noteptr->data;
tptr->nybble1 = noteptr->data >> 4;
tptr->nybble2 = noteptr->data & 0xf;
tptr->newinstrument = noteptr->instrument;
/*
* Set sampleoffset here
*/
if (tptr->newinstrument) tptr->usesampleoffset = 0;
if (tptr->effect == 0x9)
{
if (tptr->effectdata) tptr->sampleoffset = tptr->effectdata;
tptr->usesampleoffset = 1;
}
/*
* Start new note if there is one; but check there
* isn't notedelay (toneportamento is handled by
* startnewnote()!)
*/
if ((tptr->effect != 0xe) || (tptr->nybble1 != 0xd) || (tptr->nybble2 == 0))
{
if (tptr->newnote) startnewnote(tptr, chptr);
if (tptr->newinstrument)
{
tptr->instrument = tptr->newinstrument - 1;
tptr->ip = &instrument[tptr->instrument];
tptr->vol = tptr->ip->vol;
chptr->vol = tptr->vol * 256;
}
}
/*
* Reset period if not vibrato or toneportamento
*/
if ((tptr->effect < 0x3) || (tptr->effect > 0x6))
{
tptr->period = tptr->baseperiod;
}
/*
* Reset volume if not tremolo
*/
if (tptr->effect != 0x7)
{
chptr->vol = tptr->vol * 256;
}
switch (tptr->effect)
{
case 0x0:
break;
/* Set portamento speed up */
case 0x1:
if (tptr->effectdata) tptr->portaspeedup = tptr->effectdata;
break;
/* Set portamento speed down */
case 0x2:
if (tptr->effectdata) tptr->portaspeeddown = tptr->effectdata;
break;
/* Set TP. speed */
case 0x3:
if (tptr->effectdata) tptr->tpspeed = tptr->effectdata;
break;
/* Set vibrato */
case 0x4:
if (tptr->nybble1) tptr->vibratospeed = tptr->nybble1;
if (tptr->nybble2) tptr->vibratodepth = tptr->nybble2;
break;
/* Set tremolo */
case 0x7:
if (tptr->nybble1) tptr->tremolospeed = tptr->nybble1;
if (tptr->nybble2) tptr->tremolodepth = tptr->nybble2;
break;
/* Set Panning */
case 0x8:
chptr->panning = tptr->effectdata;
break;
/* Volume slide speed set */
case 0x5:
case 0x6:
case 0xa:
if (tptr->effectdata)
{
tptr->volspeedup = tptr->nybble1;
tptr->volspeeddown = tptr->nybble2;
}
break;
/* Pos. jump */
case 0xb:
mt_line = 63;
mt_pos = tptr->effectdata - 1;
break;
/* Set volume */
case 0xc:
chptr->vol = tptr->effectdata * 256;
if (chptr->vol < 0) chptr->vol = 0;
if (chptr->vol > 64*256) chptr->vol = 64*256;
tptr->vol = chptr->vol / 256;
break;
/* Pattern break */
case 0xd:
mt_line = tptr->nybble1 * 10 + tptr->nybble2 - 1;
if (!mt_patternbreak)
{
mt_patternbreak = 1;
mt_pos++;
}
break;
/* Extended command */
case 0xe:
extendedcommand(tptr, chptr);
break;
/* Set tempo */
case 0xf:
if (!tptr->effectdata)
{
if (mt_roundcounter != 1)
{
judas_stopmod();
judas_playmod(mt_roundcounter);
if (mt_roundcounter) mt_roundcounter--;
return;
} else {
judas_stopmod();
return;
}
}
if (tptr->effectdata < 32) mt_ticktempo = tptr->effectdata;
else judas_bpmtempo = tptr->effectdata;
break;
}
if (tptr->period) chptr->freq = AMIGA_CLOCK / tptr->period;
noteptr++;
chptr++;
tptr++;
}
}
if (mt_tickcount)
{
/*
* If tick isn't 0, update effects like portamento & arpeggio
*/
for (count = mt_channels; count > 0; count--)
{
switch (tptr->effect)
{
/* Arpeggio */
case 0x0:
{
if (tptr->effectdata)
{
char phase = mt_tickcount % 3;
switch (phase)
{
unsigned char arpnote;
case 0:
tptr->period = tptr->baseperiod;
break;
case 1:
arpnote = tptr->note + tptr->nybble1;
if (arpnote > 95) arpnote = 95;
tptr->period = periodtable[tptr->finetune][arpnote % 12] >> (arpnote / 12);
break;
case 2:
arpnote = tptr->note + tptr->nybble2;
if (arpnote > 95) arpnote = 95;
tptr->period = periodtable[tptr->finetune][arpnote % 12] >> (arpnote / 12);
break;
}
}
}
break;
/* Portamento up */
case 0x1:
tptr->baseperiod -= tptr->portaspeedup;
if (tptr->baseperiod < 27) tptr->baseperiod = 27;
tptr->period = tptr->baseperiod;
break;
/* Portamento down */
case 0x2:
tptr->baseperiod += tptr->portaspeeddown;
if (tptr->baseperiod > 7256) tptr->baseperiod = 7256;
tptr->period = tptr->baseperiod;
break;
/* Toneportamento */
case 0x3:
if (tptr->tp)
{
if (tptr->baseperiod < tptr->targetperiod)
{
tptr->baseperiod += tptr->tpspeed;
if (tptr->baseperiod >= tptr->targetperiod)
{
tptr->baseperiod = tptr->targetperiod;
tptr->tp = 0;
}
}
if (tptr->baseperiod > tptr->targetperiod)
{
tptr->baseperiod -= tptr->tpspeed;
if (tptr->baseperiod <= tptr->targetperiod)
{
tptr->baseperiod = tptr->targetperiod;
tptr->tp = 0;
}
}
tptr->period = tptr->baseperiod;
if (tptr->glissando)
{
int offset = 0x7fffffff;
int sc;
short bestperiod = 0;
for (sc = 0; sc < 96; sc++)
{
int newoffset = abs(tptr->period - (periodtable[tptr->finetune][sc % 12] >> (sc / 12)));
if (newoffset < offset)
{
bestperiod = periodtable[tptr->finetune][sc % 12] >> (sc / 12);
offset = newoffset;
}
}
tptr->period = bestperiod;
}
}
break;
/* Vibrato */
case 0x4:
tptr->vibratophase += tptr->vibratospeed * 4;
tptr->period = tptr->baseperiod + ((vibratotable[vibratotypetable[tptr->vibratotype & 3]][tptr->vibratophase] * tptr->vibratodepth) >> 5);
if (tptr->period < 27) tptr->period = 27;
if (tptr->period > 7256) tptr->period = 7256;
break;
/* Toneportamento + volslide */
case 0x5:
if (tptr->tp)
{
if (tptr->baseperiod < tptr->targetperiod)
{
tptr->baseperiod += tptr->tpspeed;
if (tptr->baseperiod >= tptr->targetperiod)
{
tptr->baseperiod = tptr->targetperiod;
tptr->tp = 0;
}
}
if (tptr->baseperiod > tptr->targetperiod)
{
tptr->baseperiod -= tptr->tpspeed;
if (tptr->baseperiod <= tptr->targetperiod)
{
tptr->baseperiod = tptr->targetperiod;