/*************************************************************************** Atari Gauntlet hardware ****************************************************************************/ #include "driver.h" #include "machine/atarigen.h" #include "gauntlet.h" /************************************* * * Globals we own * *************************************/ UINT8 vindctr2_screen_refresh; /************************************* * * Statics * *************************************/ static UINT8 playfield_tile_bank; static UINT8 playfield_color_bank; /************************************* * * Tilemap callbacks * *************************************/ static TILE_GET_INFO( get_alpha_tile_info ) { UINT16 data = atarigen_alpha[tile_index]; int code = data & 0x3ff; int color = ((data >> 10) & 0x0f) | ((data >> 9) & 0x20); int opaque = data & 0x8000; SET_TILE_INFO(1, code, color, opaque ? TILE_FORCE_LAYER0 : 0); } static TILE_GET_INFO( get_playfield_tile_info ) { UINT16 data = atarigen_playfield[tile_index]; int code = ((playfield_tile_bank * 0x1000) + (data & 0xfff)) ^ 0x800; int color = 0x10 + (playfield_color_bank * 8) + ((data >> 12) & 7); SET_TILE_INFO(0, code, color, (data >> 15) & 1); } /************************************* * * Video system start * *************************************/ VIDEO_START( gauntlet ) { static const struct atarimo_desc modesc = { 0, /* index to which gfx system */ 1, /* number of motion object banks */ 1, /* 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? */ 8, /* pixels per SLIP entry (0 for no-slip) */ 1, /* pixel offset for SLIPs */ 0, /* maximum number of links to visit/scanline (0=all) */ 0x100, /* base palette entry */ 0x100, /* maximum number of colors */ 0, /* transparent pen index */ {{ 0,0,0,0x03ff }}, /* mask for the link */ {{ 0 }}, /* mask for the graphics bank */ {{ 0x7fff,0,0,0 }}, /* mask for the code index */ {{ 0 }}, /* mask for the upper code index */ {{ 0,0x000f,0,0 }}, /* mask for the color */ {{ 0,0xff80,0,0 }}, /* mask for the X position */ {{ 0,0,0xff80,0 }}, /* mask for the Y position */ {{ 0,0,0x0038,0 }}, /* mask for the width, in tiles*/ {{ 0,0,0x0007,0 }}, /* mask for the height, in tiles */ {{ 0,0,0x0040,0 }}, /* mask for the horizontal flip */ {{ 0 }}, /* mask for the vertical flip */ {{ 0 }}, /* 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 */ }; UINT16 *codelookup; int i, size; /* initialize the playfield */ atarigen_playfield_tilemap = tilemap_create(get_playfield_tile_info, tilemap_scan_cols, TILEMAP_TYPE_PEN, 8,8, 64,64); /* initialize the motion objects */ atarimo_init(machine, 0, &modesc); /* initialize the alphanumerics */ atarigen_alpha_tilemap = tilemap_create(get_alpha_tile_info, tilemap_scan_rows, TILEMAP_TYPE_PEN, 8,8, 64,32); tilemap_set_transparent_pen(atarigen_alpha_tilemap, 0); /* modify the motion object code lookup table to account for the code XOR */ codelookup = atarimo_get_code_lookup(0, &size); for (i = 0; i < size; i++) codelookup[i] ^= 0x800; /* set up the base color for the playfield */ playfield_color_bank = vindctr2_screen_refresh ? 0 : 1; } /************************************* * * Horizontal scroll register * *************************************/ WRITE16_HANDLER( gauntlet_xscroll_w ) { UINT16 oldxscroll = *atarigen_xscroll; COMBINE_DATA(atarigen_xscroll); /* if something changed, force a partial update */ if (*atarigen_xscroll != oldxscroll) { video_screen_update_partial(0, video_screen_get_vpos(0)); /* adjust the scrolls */ tilemap_set_scrollx(atarigen_playfield_tilemap, 0, *atarigen_xscroll); atarimo_set_xscroll(0, *atarigen_xscroll & 0x1ff); } } /************************************* * * Vertical scroll/PF bank register * *************************************/ WRITE16_HANDLER( gauntlet_yscroll_w ) { UINT16 oldyscroll = *atarigen_yscroll; COMBINE_DATA(atarigen_yscroll); /* if something changed, force a partial update */ if (*atarigen_yscroll != oldyscroll) { video_screen_update_partial(0, video_screen_get_vpos(0)); /* if the bank changed, mark all tiles dirty */ if (playfield_tile_bank != (*atarigen_yscroll & 3)) { playfield_tile_bank = *atarigen_yscroll & 3; tilemap_mark_all_tiles_dirty(atarigen_playfield_tilemap); } /* adjust the scrolls */ tilemap_set_scrolly(atarigen_playfield_tilemap, 0, *atarigen_yscroll >> 7); atarimo_set_yscroll(0, (*atarigen_yscroll >> 7) & 0x1ff); } } /************************************* * * Main refresh * *************************************/ VIDEO_UPDATE( gauntlet ) { 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]) { /* verified via schematics: MO pen 1 clears PF color bit 0x80 */ if ((mo[x] & 0x0f) == 1) { /* Vindicators Part II has extra logic here for the bases */ if (!vindctr2_screen_refresh || (mo[x] & 0xf0) != 0) pf[x] ^= 0x80; } else pf[x] = mo[x]; /* erase behind ourselves */ mo[x] = 0; } } /* add the alpha on top */ tilemap_draw(bitmap, cliprect, atarigen_alpha_tilemap, 0, 0); return 0; }