diff options
Diffstat (limited to 'src/mame/video/gauntlet.c')
-rw-r--r-- | src/mame/video/gauntlet.c | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/src/mame/video/gauntlet.c b/src/mame/video/gauntlet.c new file mode 100644 index 00000000000..2a0cbc636de --- /dev/null +++ b/src/mame/video/gauntlet.c @@ -0,0 +1,230 @@ +/*************************************************************************** + + 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; +} |