/***************************************************************************
Atari Night Driver hardware
***************************************************************************/
#include "driver.h"
#include "includes/nitedrvr.h"
UINT8 *nitedrvr_hvc;
static tilemap *bg_tilemap;
WRITE8_HANDLER( nitedrvr_videoram_w )
{
videoram[offset] = data;
tilemap_mark_tile_dirty(bg_tilemap, offset);
}
WRITE8_HANDLER( nitedrvr_hvc_w )
{
nitedrvr_hvc[offset & 0x3f] = data;
if ((offset & 0x30) == 0x30)
watchdog_reset_w(0, 0);
}
static TILE_GET_INFO( get_bg_tile_info )
{
int code = videoram[tile_index] & 0x3f;
SET_TILE_INFO(0, code, 0, 0);
}
VIDEO_START( nitedrvr )
{
bg_tilemap = tilemap_create(get_bg_tile_info, tilemap_scan_rows,
TILEMAP_TYPE_PEN, 8, 8, 32, 32);
}
static void draw_box(running_machine *machine, mame_bitmap *bitmap, int bx, int by, int ex, int ey )
{
int x, y;
for (y = by; y < ey; y++)
{
for (x = bx; x < ex; x++)
{
if ((y < 256) && (x < 256))
*BITMAP_ADDR16(bitmap, y, x) = machine->pens[1];
}
}
return;
}
static void draw_roadway(running_machine *machine, mame_bitmap *bitmap)
{
int roadway;
for (roadway = 0; roadway < 16; roadway++)
{
int bx, by, ex, ey;
bx = nitedrvr_hvc[roadway];
by = nitedrvr_hvc[roadway + 16];
ex = bx + ((nitedrvr_hvc[roadway + 32] & 0xf0) >> 4);
ey = by + (16 - (nitedrvr_hvc[roadway + 32] & 0x0f));
draw_box(machine, bitmap, bx, by, ex, ey);
}
}
VIDEO_UPDATE( nitedrvr )
{
tilemap_draw(bitmap, cliprect, bg_tilemap, 0, 0);
draw_roadway(machine, bitmap);
return 0;
}