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/***************************************************************************
Gottlieb Exterminator hardware
***************************************************************************/
#include "driver.h"
#include "cpu/tms34010/tms34010.h"
#include "exterm.h"
UINT16 *exterm_master_videoram, *exterm_slave_videoram;
/*************************************
*
* Palette setup
*
*************************************/
PALETTE_INIT( exterm )
{
int i;
/* initialize 555 RGB lookup */
for (i = 0; i < 32768; i++)
palette_set_color_rgb(machine, i + 0x800, pal5bit(i >> 10), pal5bit(i >> 5), pal5bit(i >> 0));
}
/*************************************
*
* Master shift register
*
*************************************/
void exterm_to_shiftreg_master(UINT32 address, UINT16 *shiftreg)
{
memcpy(shiftreg, &exterm_master_videoram[TOWORD(address)], 256 * sizeof(UINT16));
}
void exterm_from_shiftreg_master(UINT32 address, UINT16 *shiftreg)
{
memcpy(&exterm_master_videoram[TOWORD(address)], shiftreg, 256 * sizeof(UINT16));
}
void exterm_to_shiftreg_slave(UINT32 address, UINT16 *shiftreg)
{
memcpy(shiftreg, &exterm_slave_videoram[TOWORD(address)], 256 * 2 * sizeof(UINT8));
}
void exterm_from_shiftreg_slave(UINT32 address, UINT16 *shiftreg)
{
memcpy(&exterm_slave_videoram[TOWORD(address)], shiftreg, 256 * 2 * sizeof(UINT8));
}
/*************************************
*
* Main video refresh
*
*************************************/
void exterm_scanline_update(running_machine *machine, int screen, mame_bitmap *bitmap, int scanline, const tms34010_display_params *params)
{
UINT16 *bgsrc = &exterm_master_videoram[(params->rowaddr << 8) & 0xff00];
UINT16 *fgsrc = NULL;
UINT16 *dest = BITMAP_ADDR16(bitmap, scanline, 0);
tms34010_display_params fgparams;
int coladdr = params->coladdr;
int fgcoladdr = 0;
int x;
/* get parameters for the slave CPU */
tms34010_get_display_params(1, &fgparams);
/* compute info about the slave vram */
if (fgparams.enabled && scanline >= fgparams.veblnk && scanline < fgparams.vsblnk && fgparams.heblnk < fgparams.hsblnk)
{
fgsrc = &exterm_slave_videoram[((fgparams.rowaddr << 8) + (fgparams.yoffset << 7)) & 0xff80];
fgcoladdr = (fgparams.coladdr >> 1);
}
/* copy the non-blanked portions of this scanline */
for (x = params->heblnk; x < params->hsblnk; x += 2)
{
UINT16 bgdata, fgdata = 0;
if (fgsrc != NULL)
fgdata = fgsrc[fgcoladdr++ & 0x7f];
bgdata = bgsrc[coladdr++ & 0xff];
if ((bgdata & 0xe000) == 0xe000)
dest[x + 0] = bgdata & 0x7ff;
else if ((fgdata & 0x00ff) != 0)
dest[x + 0] = fgdata & 0x00ff;
else
dest[x + 0] = (bgdata & 0x8000) ? (bgdata & 0x7ff) : (bgdata + 0x800);
bgdata = bgsrc[coladdr++ & 0xff];
if ((bgdata & 0xe000) == 0xe000)
dest[x + 1] = bgdata & 0x7ff;
else if ((fgdata & 0xff00) != 0)
dest[x + 1] = fgdata >> 8;
else
dest[x + 1] = (bgdata & 0x8000) ? (bgdata & 0x7ff) : (bgdata + 0x800);
}
}
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