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/* OpenCP Module Player
* copyright (c) '94-'10 Niklas Beisert <nbeisert@physik.tu-muenchen.de>
*
* ITPlay timing/sync handlers for IMS
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* revision history: (please note changes here)
* -nb980510 Niklas Beisert <nbeisert@physik.tu-muenchen.de>
* -first release
*/
#include "config.h"
#include <signal.h>
#include <string.h>
#include <stdio.h> /* FILE * in itplay.h */
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#include "types.h"
#include "itplay.h"
int __attribute__ ((visibility ("internal"))) it_precalctime(struct it_module *this, int startpos, int (*calctimer)[2], int calcn, int ite)
{
uint8_t *patptr=0;
int patdelaytick=0;
int patdelayrow=0;
int sync=-1;
int looped=0;
int gotorow=(startpos>>8)&0xFF;
int gotoord=startpos&0xFF;
int curord=-1;
int currow=-1;
int curspeed=this->inispeed;
int curtick=this->inispeed-1;
/* int loopord=0; unused */
int tempo=this->initempo;
int timerval=0;
int timerfrac=0;
uint8_t tempos[64];
uint8_t cmds[64];
uint8_t specials[64];
uint8_t patloopcount[64];
uint8_t patloopstart[64];
int it;
memset(tempos, 0, this->nchan);
memset(specials, 0, this->nchan);
memset(cmds, 0, this->nchan);
for (it=0; it<ite; it++)
{
int i;
int p;
curtick++;
if ((curtick==(curspeed+patdelaytick))&&patdelayrow)
{
curtick=0;
patdelayrow--;
}
if (curtick==(curspeed+patdelaytick))
{
patdelaytick=0;
curtick=0;
currow++;
if ((gotoord==-1)&&(currow==this->patlens[this->orders[curord]]))
{
gotoord=curord+1;
gotorow=0;
}
if (gotoord!=-1)
{
if (gotoord!=curord)
{
memset(patloopcount, 0, this->nchan);
memset(patloopstart, 0, this->nchan);
}
if (gotoord>=this->endord)
gotoord=0;
while (this->orders[gotoord]==0xFFFF)
gotoord++;
if (gotoord==this->endord)
gotoord=0;
if (gotorow>=this->patlens[this->orders[gotoord]])
{
gotoord++;
gotorow=0;
while (this->orders[gotoord]==0xFFFF)
gotoord++;
if (gotoord==this->endord)
gotoord=0;
}
if (gotoord<curord)
looped=1;
curord=gotoord;
patptr=this->patterns[this->orders[curord]];
for (currow=0; currow<gotorow; currow++)
{
while (*patptr)
patptr+=6;
patptr++;
}
gotoord=-1;
}
for (i=0; i<this->nchan; i++)
cmds[i]=0;
if (!patptr)
{
fprintf(stderr, "playit: ittime.c: patptr not set\n");
kill(getpid(), SIGTERM);
abort();
}
while (*patptr)
{
int ch=*patptr++-1;
int data=patptr[4];
cmds[ch]=patptr[3];
switch (cmds[ch])
{
case cmdSpeed:
if (data)
curspeed=data;
break;
case cmdJump:
gotorow=0;
gotoord=data;
break;
case cmdBreak:
if (gotoord==-1)
gotoord=curord+1;
gotorow=data;
break;
case cmdSpecial:
if (data)
specials[ch]=data;
switch (specials[ch]>>4)
{
case cmdSPatDelayTick:
patdelaytick=specials[ch]&0xF;
break;
case cmdSPatLoop:
if (!(specials[ch]&0xF))
patloopstart[ch]=currow;
else {
patloopcount[ch]++;
if (patloopcount[ch]<=(specials[ch]&0xF))
{
gotorow=patloopstart[ch];
gotoord=curord;
} else {
patloopcount[ch]=0;
patloopstart[ch]=currow+1;
}
}
break;
case cmdSPatDelayRow:
patdelayrow=specials[ch]&0xF;
break;
}
break;
case cmdTempo:
if (data)
tempos[ch]=data;
if (tempos[ch]>=0x20)
tempo=tempos[ch];
break;
#if 0
TODO this upcode is invalid
case cmdSync:
sync=data;
break;
#endif
}
patptr+=5;
}
patptr++;
} else
for (i=0; i<this->nchan; i++)
if ((cmds[i]==cmdTempo)&&(tempos[i]<0x20))
{
tempo+=(tempos[i]<0x10)?-tempos[i]:(tempos[i]&0xF);
tempo=(tempo<0x20)?0x20:(tempo>0xFF)?0xFF:tempo;
}
p=(curord<<16)|(currow<<8)|curtick;
for (i=0; i<calcn; i++)
if ((p==calctimer[i][0])&&(calctimer[i][1]<0))
if (!++calctimer[i][1])
calctimer[i][1]=timerval;
if (sync!=-1)
for (i=0; i<calcn; i++)
if ((calctimer[i][0]==(-256-sync))&&(calctimer[i][1]<0))
if (!++calctimer[i][1])
calctimer[i][1]=timerval;
sync=-1;
if (looped)
for (i=0; i<calcn; i++)
if ((calctimer[i][0]==-1)&&(calctimer[i][1]<0))
if (!++calctimer[i][1])
calctimer[i][1]=timerval;
looped=0;
timerfrac+=4096*163840/tempo;
timerval+=timerfrac>>12;
timerfrac&=4095;
for (i=0; i<calcn; i++)
if (calctimer[i][1]<0)
break;
if (i==calcn)
break;
}
return 1;
}
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