/***************************************************************************
Atari Bad Lands hardware
***************************************************************************/
#include "driver.h"
#include "machine/atarigen.h"
#include "includes/badlands.h"
/*************************************
*
* Local variables
*
*************************************/
static UINT8 playfield_tile_bank;
/*************************************
*
* Tilemap callbacks
*
*************************************/
static TILE_GET_INFO( get_playfield_tile_info )
{
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_TYPE_PEN, 8,8, 64,32);
/* initialize the motion objects */
atarimo_init(machine, 0, &modesc);
}
/*************************************
*
* Playfield bank write handler
*
*************************************/
WRITE16_HANDLER( badlands_pf_bank_w )
{
if (ACCESSING_LSB)
if (playfield_tile_bank != (data & 1))
{
video_screen_update_partial(0, video_screen_get_vpos(0));
playfield_tile_bank = data & 1;
tilemap_mark_all_tiles_dirty(atarigen_playfield_tilemap);
}
}
/*************************************
*
* Main refresh
*
*************************************/
VIDEO_UPDATE( badlands )
{
struct atarimo_rect_list rectlist;
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(machine, 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;
}
}
return 0;
}