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Added preliminary CD Seek mechanism, fixes Zero Divide booting

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This commit is contained in:
Angelo Salese 2013-02-20 22:32:31 +00:00
parent e6ce889436
commit dba816bc3c
2 changed files with 52 additions and 12 deletions
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61
src/emu/machine/stvcd.c
View File

@ -77,17 +77,17 @@ int saturn_state::get_timing_command(void)
}
/* FIXME: assume Saturn CD-ROMs to have a 2 secs pre-gap for now. */
int saturn_state::get_track_index(void)
int saturn_state::get_track_index(UINT32 fad)
{
UINT32 rel_fad;
UINT8 track;
if(cdrom_get_track_type(cdrom, cdrom_get_track(cdrom, cd_curfad)) != CD_TRACK_AUDIO)
if(cdrom_get_track_type(cdrom, cdrom_get_track(cdrom, fad)) != CD_TRACK_AUDIO)
return 1;
track = cdrom_get_track( cdrom, cd_curfad );
track = cdrom_get_track( cdrom, fad );
rel_fad = cd_curfad - cdrom_get_track_start( cdrom, track );
rel_fad = fad - cdrom_get_track_start( cdrom, track );
if(rel_fad < 150)
return 0;
@ -97,10 +97,23 @@ int saturn_state::get_track_index(void)
void saturn_state::cr_standard_return(UINT16 cur_status)
{
cr1 = cur_status | (playtype << 7) | 0x00 | (cdda_repeat_count & 0xf); //options << 4 | repeat & 0xf
cr2 = (cur_track == 0xff) ? 0xffff : (cdrom_get_adr_control(cdrom, cur_track)<<8 | cur_track); // TODO: fix current track
cr3 = (get_track_index()<<8) | (cd_curfad>>16); //index & 0xff00
cr4 = cd_curfad;
if ((cd_stat & 0x0f00) == CD_STAT_SEEK)
{
/* During seek state, values returned are from the target position */
UINT8 seek_track = cdrom_get_track(cdrom, cd_fad_seek-150);
cr1 = cur_status | (playtype << 7) | 0x00 | (cdda_repeat_count & 0xf);
cr2 = (seek_track == 0xff) ? 0xffff : ((cdrom_get_adr_control(cdrom, seek_track)<<8) | seek_track);
cr3 = (get_track_index(cd_fad_seek)<<8) | (cd_fad_seek>>16); //index & 0xff00
cr4 = cd_fad_seek;
}
else
{
cr1 = cur_status | (playtype << 7) | 0x00 | (cdda_repeat_count & 0xf); //options << 4 | repeat & 0xf
cr2 = (cur_track == 0xff) ? 0xffff : (cdrom_get_adr_control(cdrom, cur_track)<<8 | cur_track); // TODO: fix current track
cr3 = (get_track_index(cd_curfad)<<8) | (cd_curfad>>16); //index & 0xff00
cr4 = cd_curfad;
}
cd_stat |= CD_STAT_PERI;
}
@ -332,7 +345,9 @@ void saturn_state::cd_exec_command( void )
if(((start_pos)>>8) != 0)
{
cur_track = (start_pos)>>8;
cd_curfad = cdrom_get_track_start(cdrom, cur_track-1);
cd_fad_seek = cdrom_get_track_start(cdrom, cur_track-1);
cd_stat = CD_STAT_SEEK;
cdda_pause_audio( machine().device( "cdda" ), 0 );
}
else
{
@ -510,7 +525,7 @@ void saturn_state::cd_exec_command( void )
xfercount = 0;
subqbuf[0] = 0x01 | ((cdrom_get_track_type(cdrom, cdrom_get_track(cdrom, track+1)) == CD_TRACK_AUDIO) ? 0x00 : 0x40);
subqbuf[1] = dec_2_bcd(track+1);
subqbuf[2] = dec_2_bcd(get_track_index());
subqbuf[2] = dec_2_bcd(get_track_index(cd_curfad));
subqbuf[3] = dec_2_bcd((msf_rel >> 16) & 0xff);
subqbuf[4] = dec_2_bcd((msf_rel >> 8) & 0xff);
subqbuf[5] = dec_2_bcd((msf_rel >> 0) & 0xff);
@ -2427,6 +2442,30 @@ saturn_state::partitionT *saturn_state::cd_read_filtered_sector(INT32 fad, UINT8
// loads in data set up by a CD-block PLAY command
void saturn_state::cd_playdata( void )
{
if ((cd_stat & 0x0f00) == CD_STAT_SEEK)
{
//UINT8 seek_track = cdrom_get_track(cdrom, cd_fad_seek-150);
/* Zero Divide wants this TODO: timings. */
if((cd_fad_seek - cd_curfad) > (750*cd_speed))
cd_curfad += (750*cd_speed);
else if((cd_fad_seek < cd_curfad) < (-750*cd_speed))
cd_curfad -= (750*cd_speed);
else
{
cd_curfad = cd_fad_seek;
cd_stat = CD_STAT_PLAY;
}
#if 0
cr1 = cd_stat | 0x00; //options << 4 | repeat & 0xf
cr2 = (cdrom_get_adr_control(cdrom, seek_track)<<8 | seek_track);
cr3 = (get_track_index(cd_fad_seek)<<8) | (cd_fad_seek>>16); //index & 0xff00
cr4 = cd_fad_seek;
#endif
return;
}
if ((cd_stat & 0x0f00) == CD_STAT_PLAY)
{
if (fadstoplay)
@ -2490,7 +2529,7 @@ void saturn_state::cd_readblock(UINT32 fad, UINT8 *dat)
{
if (cdrom)
{
cdrom_read_data(cdrom, fad-150, dat, CD_TRACK_MODE1);
cdrom_read_data(cdrom, fad-150, dat, CD_TRACK_MODE1, true);
}
}

3
src/mame/includes/stv.h
View File

@ -627,7 +627,7 @@ public:
void stvcd_set_tray_open(void);
void stvcd_set_tray_close(void);
int get_track_index(void);
int get_track_index(UINT32 fad);
void cr_standard_return(UINT16 cur_status);
void cd_free_block(blockT *blktofree);
void cd_defragblocks(partitionT *part);
@ -684,6 +684,7 @@ public:
UINT16 hirqmask, hirqreg;
UINT16 cd_stat;
UINT32 cd_curfad;// = 0;
UINT32 cd_fad_seek;
UINT32 fadstoplay;// = 0;
UINT32 in_buffer;// = 0; // amount of data in the buffer
int oddframe;// = 0;