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/***************************************************************************
video/zerozone.c
***************************************************************************/
#include "driver.h"
#include "zerozone.h"
WRITE16_HANDLER( zerozone_tilemap_w )
{
zerozone_state *state = (zerozone_state *)space->machine->driver_data;
COMBINE_DATA(&state->videoram[offset]);
tilemap_mark_tile_dirty(state->zz_tilemap,offset);
}
WRITE16_HANDLER(zerozone_tilebank_w)
{
zerozone_state *state = (zerozone_state *)space->machine->driver_data;
// popmessage ("Data %04x",data);
state->tilebank = data & 0x07;
tilemap_mark_all_tiles_dirty(state->zz_tilemap);
}
static TILE_GET_INFO( get_zerozone_tile_info )
{
zerozone_state *state = (zerozone_state *)machine->driver_data;
int tileno = state->videoram[tile_index] & 0x07ff;
int colour = state->videoram[tile_index] & 0xf000;
if (state->videoram[tile_index] & 0x0800)
tileno += state->tilebank * 0x800;
SET_TILE_INFO(0, tileno, colour >> 12, 0);
}
VIDEO_START( zerozone )
{
zerozone_state *state = (zerozone_state *)machine->driver_data;
// i'm not 100% sure it should be opaque, pink title screen looks strange in las vegas girls
// but if its transparent other things look incorrect
state->zz_tilemap = tilemap_create(machine, get_zerozone_tile_info, tilemap_scan_cols, 8, 8, 64, 32);
}
VIDEO_UPDATE( zerozone )
{
zerozone_state *state = (zerozone_state *)screen->machine->driver_data;
tilemap_draw(bitmap, cliprect, state->zz_tilemap, 0, 0);
return 0;
}
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