#include "driver.h"
#include "video/konamiic.h"
static int zoom_colorbase[2],road_colorbase[2],sprite_colorbase;
/***************************************************************************
Callbacks for the K053247
***************************************************************************/
static void overdriv_sprite_callback(int *code,int *color,int *priority_mask)
{
int pri = (*color & 0xffe0) >> 5; /* ??????? */
if (pri) *priority_mask = 0x02;
else *priority_mask = 0x00;
*color = sprite_colorbase + (*color & 0x001f);
}
/***************************************************************************
Callbacks for the K051316
***************************************************************************/
static void zoom_callback_0(int *code,int *color,int *flags)
{
*flags = (*color & 0x40) ? TILE_FLIPX : 0;
*code |= ((*color & 0x03) << 8);
*color = zoom_colorbase[0] + ((*color & 0x3c) >> 2);
}
static void zoom_callback_1(int *code,int *color,int *flags)
{
*flags = (*color & 0x40) ? TILE_FLIPX : 0;
*code |= ((*color & 0x03) << 8);
*color = zoom_colorbase[1] + ((*color & 0x3c) >> 2);
}
/***************************************************************************
Start the video hardware emulation.
***************************************************************************/
VIDEO_START( overdriv )
{
K053251_vh_start();
K051316_vh_start_0(machine,REGION_GFX2,4,TRUE,0,zoom_callback_0);
K051316_vh_start_1(machine,REGION_GFX3,4,FALSE,0,zoom_callback_1);
K053247_vh_start(machine, REGION_GFX1,77,22,NORMAL_PLANE_ORDER,overdriv_sprite_callback);
K051316_wraparound_enable(0,1);
K051316_set_offset(0,14,-1);
K051316_set_offset(1,15,0);
}
/***************************************************************************
Display refresh
***************************************************************************/
VIDEO_UPDATE( overdriv )
{
sprite_colorbase = K053251_get_palette_index(K053251_CI0);
road_colorbase[1] = K053251_get_palette_index(K053251_CI1);
road_colorbase[0] = K053251_get_palette_index(K053251_CI2);
zoom_colorbase[1] = K053251_get_palette_index(K053251_CI3);
zoom_colorbase[0] = K053251_get_palette_index(K053251_CI4);
fillbitmap(priority_bitmap,0,cliprect);
K051316_zoom_draw_0(bitmap,cliprect,0,0);
K051316_zoom_draw_1(bitmap,cliprect,0,1);
K053247_sprites_draw(machine, bitmap,cliprect);
return 0;
}