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

    Atari Bad Lands hardware

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

#include "driver.h"
#include "machine/atarigen.h"



/*************************************
 *
 *  Local variables
 *
 *************************************/

static UINT8 playfield_tile_bank;



/*************************************
 *
 *  Tilemap callbacks
 *
 *************************************/

static void get_playfield_tile_info(int tile_index)
{
	UINT16 data = atarigen_playfield[tile_index];
	int code = (data & 0x1fff) + ((data & 0x1000) ? (playfield_tile_bank << 12) : 0);
	int color = (data >> 13) & 0x07;
	SET_TILE_INFO(0, code, color, 0);
}



/*************************************
 *
 *  Generic video system start
 *
 *************************************/

VIDEO_START( badlands )
{
	static const struct atarimo_desc modesc =
	{
		1,					/* index to which gfx system */
		1,					/* number of motion object banks */
		0,					/* are the entries linked? */
		1,					/* are the entries split? */
		0,					/* render in reverse order? */
		0,					/* render in swapped X/Y order? */
		0,					/* does the neighbor bit affect the next object? */
		0,					/* pixels per SLIP entry (0 for no-slip) */
		0,					/* pixel offset for SLIPs */
		0,					/* maximum number of links to visit/scanline (0=all) */

		0x80,				/* base palette entry */
		0x80,				/* maximum number of colors */
		0,					/* transparent pen index */

		{{ 0x1f }},			/* mask for the link */
		{{ 0 }},			/* mask for the graphics bank */
		{{ 0x0fff,0,0,0 }},	/* mask for the code index */
		{{ 0 }},			/* mask for the upper code index */
		{{ 0,0,0,0x0007 }},	/* mask for the color */
		{{ 0,0,0,0xff80 }},	/* mask for the X position */
		{{ 0,0xff80,0,0 }},	/* mask for the Y position */
		{{ 0 }},			/* mask for the width, in tiles*/
		{{ 0,0x000f,0,0 }},	/* mask for the height, in tiles */
		{{ 0 }},			/* mask for the horizontal flip */
		{{ 0 }},			/* mask for the vertical flip */
		{{ 0,0,0,0x0008 }},	/* mask for the priority */
		{{ 0 }},			/* mask for the neighbor */
		{{ 0 }},			/* mask for absolute coordinates */

		{{ 0 }},			/* mask for the special value */
		0,					/* resulting value to indicate "special" */
		0					/* callback routine for special entries */
	};

	/* initialize the playfield */
	atarigen_playfield_tilemap = tilemap_create(get_playfield_tile_info, tilemap_scan_rows, TILEMAP_OPAQUE, 8,8, 64,32);
	if (!atarigen_playfield_tilemap)
		return 1;

	/* initialize the motion objects */
	if (!atarimo_init(0, &modesc))
		return 1;

	return 0;
}



/*************************************
 *
 *  Playfield bank write handler
 *
 *************************************/

WRITE16_HANDLER( badlands_pf_bank_w )
{
	if (ACCESSING_LSB)
		if (playfield_tile_bank != (data & 1))
		{
			force_partial_update(cpu_getscanline());
			playfield_tile_bank = data & 1;
			tilemap_mark_all_tiles_dirty(atarigen_playfield_tilemap);
		}
}



/*************************************
 *
 *  Main refresh
 *
 *************************************/

VIDEO_UPDATE( badlands )
{
	struct atarimo_rect_list rectlist;
	struct mame_bitmap *mobitmap;
	int x, y, r;

	/* draw the playfield */
	tilemap_draw(bitmap, cliprect, atarigen_playfield_tilemap, 0, 0);

	/* draw and merge the MO */
	mobitmap = atarimo_render(0, cliprect, &rectlist);
	for (r = 0; r < rectlist.numrects; r++, rectlist.rect++)
		for (y = rectlist.rect->min_y; y <= rectlist.rect->max_y; y++)
		{
			UINT16 *mo = (UINT16 *)mobitmap->base + mobitmap->rowpixels * y;
			UINT16 *pf = (UINT16 *)bitmap->base + bitmap->rowpixels * y;
			for (x = rectlist.rect->min_x; x <= rectlist.rect->max_x; x++)
				if (mo[x])
				{
					/* not yet verified
                    */
					if ((mo[x] & ATARIMO_PRIORITY_MASK) || !(pf[x] & 8))
						pf[x] = mo[x] & ATARIMO_DATA_MASK;

					/* erase behind ourselves */
					mo[x] = 0;
				}
		}
}
