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path: root/src/mame/video/overdriv.c
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#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;
}