#include "driver.h"
#include "video/konamiic.h"


static int layer_colorbase[3],sprite_colorbase,bg_colorbase;
static int layerpri[3];


/***************************************************************************

  Callbacks for the K052109

***************************************************************************/

static void xmen_tile_callback(int layer,int bank,int *code,int *color,int *flags,int *priority)
{
	/* (color & 0x02) is flip y handled internally by the 052109 */
	if (layer == 0)
		*color = layer_colorbase[layer] + ((*color & 0xf0) >> 4);
	else
		*color = layer_colorbase[layer] + ((*color & 0x7c) >> 2);
}

/***************************************************************************

  Callbacks for the K053247

***************************************************************************/

static void xmen_sprite_callback(int *code,int *color,int *priority_mask)
{
	int pri = (*color & 0x00e0) >> 4;	/* ??????? */
	if (pri <= layerpri[2])								*priority_mask = 0;
	else if (pri > layerpri[2] && pri <= layerpri[1])	*priority_mask = 0xf0;
	else if (pri > layerpri[1] && pri <= layerpri[0])	*priority_mask = 0xf0|0xcc;
	else 												*priority_mask = 0xf0|0xcc|0xaa;

	*color = sprite_colorbase + (*color & 0x001f);
}



/***************************************************************************

  Start the video hardware emulation.

***************************************************************************/

VIDEO_START( xmen )
{
	K053251_vh_start();

	K052109_vh_start(machine,REGION_GFX1,NORMAL_PLANE_ORDER,xmen_tile_callback);
	K053247_vh_start(machine,REGION_GFX2,53,-2,NORMAL_PLANE_ORDER,xmen_sprite_callback);
}

static mame_bitmap * screen_right;
static mame_bitmap * screen_left;
static UINT16 *K053247_ram;

VIDEO_START( xmen6p )
{
	K053251_vh_start();

	K052109_vh_start(machine,REGION_GFX1,NORMAL_PLANE_ORDER,xmen_tile_callback);
	K053247_vh_start(machine,REGION_GFX2,53,-2,NORMAL_PLANE_ORDER,xmen_sprite_callback);
	K053247_export_config(&K053247_ram, NULL, NULL, NULL, NULL);

	screen_left = auto_bitmap_alloc(64*8, 32*8, BITMAP_FORMAT_INDEXED16);
	screen_right = auto_bitmap_alloc(64*8, 32*8, BITMAP_FORMAT_INDEXED16);
}


/***************************************************************************

  Display refresh

***************************************************************************/

/* useful function to sort the three tile layers by priority order */
static void sortlayers(int *layer,int *pri)
{
#define SWAP(a,b) \
	if (pri[a] < pri[b]) \
	{ \
		int t; \
		t = pri[a]; pri[a] = pri[b]; pri[b] = t; \
		t = layer[a]; layer[a] = layer[b]; layer[b] = t; \
	}

	SWAP(0,1)
	SWAP(0,2)
	SWAP(1,2)
}


VIDEO_UPDATE( xmen )
{
	int layer[3];


	bg_colorbase       = K053251_get_palette_index(K053251_CI4);
	sprite_colorbase   = K053251_get_palette_index(K053251_CI1);
	layer_colorbase[0] = K053251_get_palette_index(K053251_CI3);
	layer_colorbase[1] = K053251_get_palette_index(K053251_CI0);
	layer_colorbase[2] = K053251_get_palette_index(K053251_CI2);

	K052109_tilemap_update();

	layer[0] = 0;
	layerpri[0] = K053251_get_priority(K053251_CI3);
	layer[1] = 1;
	layerpri[1] = K053251_get_priority(K053251_CI0);
	layer[2] = 2;
	layerpri[2] = K053251_get_priority(K053251_CI2);

	sortlayers(layer,layerpri);

	fillbitmap(priority_bitmap,0,cliprect);
	/* note the '+1' in the background color!!! */
	fillbitmap(bitmap,machine->pens[16 * bg_colorbase+1],cliprect);
	tilemap_draw(bitmap,cliprect,K052109_tilemap[layer[0]],0,1);
	tilemap_draw(bitmap,cliprect,K052109_tilemap[layer[1]],0,2);
	tilemap_draw(bitmap,cliprect,K052109_tilemap[layer[2]],0,4);

	pdrawgfx_shadow_lowpri = 1;	/* fix shadows of boulders in front of feet */
	K053247_sprites_draw(machine, bitmap,cliprect);
	return 0;
}

extern UINT16 xmen_current_frame;
extern UINT16*xmen6p_spriteramleft;
extern UINT16*xmen6p_spriteramright;
extern UINT16*xmen6p_tilemapleft;
extern UINT16*xmen6p_tilemapright;
extern WRITE8_HANDLER( K052109_w );



VIDEO_UPDATE( xmen6p )
{
	int x,y;
 /* update every other frame ...help prevent screens lagging (although it still does..)..
     but maybe the hw has its own buffering hence the extra ram */
//  if (xmen_current_frame&0x8000) /* actually don't bother */
	{

		for(y=0;y<32*8;y++)
		{
			UINT16* line_dest = BITMAP_ADDR16(bitmap, y, 0);
			UINT16* line_src;

			if (screen==0) line_src = BITMAP_ADDR16(screen_left, y, 0);
			else line_src = BITMAP_ADDR16(screen_right, y, 0);

			for (x=12*8;x<52*8;x++)
			{
				line_dest[x] = line_src[x];
			}
		}
	}
	return 0;
}

/* my lefts and rights are mixed up in several places.. */
VIDEO_EOF( xmen6p )
{
	int layer[3];
	mame_bitmap * renderbitmap;
	rectangle cliprect;
	int offset;

	xmen_current_frame ^=0x8000;

//  cliprect.min_x = machine->screen[0].visarea.min_x;
//  cliprect.max_x = machine->screen[0].visarea.max_x;
//  cliprect.min_y = machine->screen[0].visarea.min_y;
//  cliprect.max_y = machine->screen[0].visarea.max_y;

	cliprect.min_x = 0;
	cliprect.max_x = 64*8-1;
	cliprect.min_y = 2*8;
	cliprect.max_y = 30*8-1;




	if (xmen_current_frame&0x8000)
	{

			/* copy the desired spritelist to the chip */
		memcpy(K053247_ram,xmen6p_spriteramright,0x1000);
		/* we write the entire content of the tileram to the chip to ensure
           everything gets marked as dirty and the desired tilemap is rendered

           this is not very efficient!
           */
		for (offset=0;offset<(0xc000/2);offset++)
		{
//          K052109_lsb_w
			K052109_w(offset,xmen6p_tilemapright[offset]&0x00ff);
		}


		renderbitmap = screen_right;
	}
	else
	{
		/* copy the desired spritelist to the chip */
		memcpy(K053247_ram,xmen6p_spriteramleft,0x1000);

		/* we write the entire content of the tileram to the chip to ensure
           everything gets marked as dirty and the desired tilemap is rendered

           this is not very efficient!
           */
		for (offset=0;offset<(0xc000/2);offset++)
		{
//          K052109_lsb_w
			K052109_w(offset,xmen6p_tilemapleft[offset]&0x00ff);
		}




		renderbitmap = screen_left;
	}


	bg_colorbase       = K053251_get_palette_index(K053251_CI4);
	sprite_colorbase   = K053251_get_palette_index(K053251_CI1);
	layer_colorbase[0] = K053251_get_palette_index(K053251_CI3);
	layer_colorbase[1] = K053251_get_palette_index(K053251_CI0);
	layer_colorbase[2] = K053251_get_palette_index(K053251_CI2);

	K052109_tilemap_update();

	layer[0] = 0;
	layerpri[0] = K053251_get_priority(K053251_CI3);
	layer[1] = 1;
	layerpri[1] = K053251_get_priority(K053251_CI0);
	layer[2] = 2;
	layerpri[2] = K053251_get_priority(K053251_CI2);

	sortlayers(layer,layerpri);

	fillbitmap(priority_bitmap,0,&cliprect);
	/* note the '+1' in the background color!!! */
	fillbitmap(renderbitmap,machine->pens[16 * bg_colorbase+1],&cliprect);
	tilemap_draw(renderbitmap,&cliprect,K052109_tilemap[layer[0]],0,1);
	tilemap_draw(renderbitmap,&cliprect,K052109_tilemap[layer[1]],0,2);
	tilemap_draw(renderbitmap,&cliprect,K052109_tilemap[layer[2]],0,4);

	pdrawgfx_shadow_lowpri = 1;	/* fix shadows of boulders in front of feet */
	K053247_sprites_draw(machine, renderbitmap,&cliprect);

}

