/***************************************************************************
Atari Night Driver hardware
***************************************************************************/
#include "emu.h"
#include "includes/nitedrvr.h"
WRITE8_HANDLER( nitedrvr_videoram_w )
{
nitedrvr_state *state = space->machine().driver_data<nitedrvr_state>();
state->m_videoram[offset] = data;
tilemap_mark_tile_dirty(state->m_bg_tilemap, offset);
}
WRITE8_HANDLER( nitedrvr_hvc_w )
{
nitedrvr_state *state = space->machine().driver_data<nitedrvr_state>();
state->m_hvc[offset & 0x3f] = data;
if ((offset & 0x30) == 0x30)
watchdog_reset_w(space, 0, 0);
}
static TILE_GET_INFO( get_bg_tile_info )
{
nitedrvr_state *state = machine.driver_data<nitedrvr_state>();
int code = state->m_videoram[tile_index] & 0x3f;
SET_TILE_INFO(0, code, 0, 0);
}
VIDEO_START( nitedrvr )
{
nitedrvr_state *state = machine.driver_data<nitedrvr_state>();
state->m_bg_tilemap = tilemap_create(machine, get_bg_tile_info, tilemap_scan_rows, 8, 8, 32, 32);
}
static void draw_box( bitmap_t *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) = 1;
}
return;
}
static void draw_roadway( running_machine &machine, bitmap_t *bitmap )
{
nitedrvr_state *state = machine.driver_data<nitedrvr_state>();
int roadway;
for (roadway = 0; roadway < 16; roadway++)
{
int bx, by, ex, ey;
bx = state->m_hvc[roadway];
by = state->m_hvc[roadway + 16];
ex = bx + ((state->m_hvc[roadway + 32] & 0xf0) >> 4);
ey = by + (16 - (state->m_hvc[roadway + 32] & 0x0f));
draw_box(bitmap, bx, by, ex, ey);
}
}
SCREEN_UPDATE( nitedrvr )
{
nitedrvr_state *state = screen->machine().driver_data<nitedrvr_state>();
tilemap_draw(bitmap, cliprect, state->m_bg_tilemap, 0, 0);
draw_roadway(screen->machine(), bitmap);
return 0;
}