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/* Eolith Speedup Handling */
/*
This uses triggers and a scanline counter to speed up the eolith games a bit
in some cases this results in a 100% speedup
e.g hidden catch 25% -> 50% speed ingame
this could probably be done a bit better using timers
*/
#include "driver.h"
#include "includes/eolithsp.h"
static int eolith_speedup_address;
static int eolith_speedup_resume_scanline;
static int eolith_vblank = 0;
static int eolith_scanline = 0;
void eolith_speedup_read(void)
{
/* for debug */
// if ((activecpu_get_pc()!=eolith_speedup_address) && (eolith_vblank!=1) )
// printf("%06x eolith speedup_read data %02x\n",activecpu_get_pc(), eolith_vblank);
if (activecpu_get_pc()==eolith_speedup_address && eolith_vblank==0 && eolith_scanline < eolith_speedup_resume_scanline)
{
cpu_spinuntil_trigger(1000);
}
}
static struct
{
const char *s_name;
UINT32 speedup_address;
int speedup_resume_scanline;
} eolith_speedup_table[] =
{
/* eolith.c */
{ "hidnctch", 0x4000bba0, 239 },
{ "raccoon", 0x40008204, 239 },
{ "puzzlekg", 0x40029458, 239 },
{ "hidctch2", 0x40009524, 239 },
{ "landbrk", 0x40023574, 239 },
{ "landbrka", 0x4002446c, 239 },
{ "nhidctch", 0x40012778, 239 },
{ "hidctch3", 0x4001f6a0, 239 },
{ "fort2b", 0x000081e0, 239 },
{ "fort2ba", 0x000081e0, 239 },
/* eolith16.c */
{ "klondkp", 0x0001a046, 239 },
/* vegaeo.c */
{ "crazywar", 0x00008cf8, 239 },
{ NULL, 0, 0 }
};
void init_eolith_speedup(running_machine *machine)
{
int n_game = 0;
eolith_speedup_address = 0;
eolith_speedup_resume_scanline = 0;
while( eolith_speedup_table[ n_game ].s_name != NULL )
{
if( strcmp( machine->gamedrv->name, eolith_speedup_table[ n_game ].s_name ) == 0 )
{
eolith_speedup_address = eolith_speedup_table[ n_game ].speedup_address;
eolith_speedup_resume_scanline = eolith_speedup_table[ n_game ].speedup_resume_scanline;
}
n_game++;
}
}
/* todo, use timers instead! */
INTERRUPT_GEN( eolith_speedup )
{
eolith_scanline = 261 - cpu_getiloops();
if (eolith_scanline==0)
{
eolith_vblank = 0;
}
if (eolith_scanline==eolith_speedup_resume_scanline)
{
cpu_trigger(1000);
}
if (eolith_scanline==240)
{
eolith_vblank = 1;
}
}
UINT32 eolith_speedup_getvblank(void *param)
{
return eolith_vblank&1;
}
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