diff options
Diffstat (limited to 'src/mame/video/badlands.c')
-rw-r--r-- | src/mame/video/badlands.c | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/src/mame/video/badlands.c b/src/mame/video/badlands.c new file mode 100644 index 00000000000..0920d05c388 --- /dev/null +++ b/src/mame/video/badlands.c @@ -0,0 +1,147 @@ +/*************************************************************************** + + 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; +} |