diff options
Diffstat (limited to 'src/mame/video/shuuz.c')
-rw-r--r-- | src/mame/video/shuuz.c | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/src/mame/video/shuuz.c b/src/mame/video/shuuz.c new file mode 100644 index 00000000000..252a0af283d --- /dev/null +++ b/src/mame/video/shuuz.c @@ -0,0 +1,140 @@ +/*************************************************************************** + + Atari Shuuz hardware + +****************************************************************************/ + +#include "driver.h" +#include "machine/atarigen.h" +#include "shuuz.h" + + + +/************************************* + * + * Tilemap callbacks + * + *************************************/ + +static TILE_GET_INFO( get_playfield_tile_info ) +{ + UINT16 data1 = atarigen_playfield[tile_index]; + UINT16 data2 = atarigen_playfield_upper[tile_index] >> 8; + int code = data1 & 0x3fff; + int color = data2 & 0x0f; + SET_TILE_INFO(0, code, color, (data1 >> 15) & 1); +} + + + +/************************************* + * + * Video system start + * + *************************************/ + +VIDEO_START( shuuz ) +{ + static const struct atarimo_desc modesc = + { + 1, /* index to which gfx system */ + 1, /* number of motion object banks */ + 1, /* are the entries linked? */ + 0, /* 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) */ + 0, /* pixel offset for SLIPs */ + 0, /* maximum number of links to visit/scanline (0=all) */ + + 0x000, /* base palette entry */ + 0x100, /* maximum number of colors */ + 0, /* transparent pen index */ + + {{ 0x00ff,0,0,0 }}, /* mask for the link */ + {{ 0 }}, /* mask for the graphics bank */ + {{ 0,0x7fff,0,0 }}, /* mask for the code index */ + {{ 0 }}, /* mask for the upper code index */ + {{ 0,0,0x000f,0 }}, /* mask for the color */ + {{ 0,0,0xff80,0 }}, /* mask for the X position */ + {{ 0,0,0,0xff80 }}, /* mask for the Y position */ + {{ 0,0,0,0x0070 }}, /* mask for the width, in tiles*/ + {{ 0,0,0,0x0007 }}, /* mask for the height, in tiles */ + {{ 0,0x8000,0,0 }}, /* 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 */ + }; + + /* 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); +} + + + +/************************************* + * + * Main refresh + * + *************************************/ + +VIDEO_UPDATE( shuuz ) +{ + 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 from the GALs on the real PCB; equations follow + * + * --- O13 is 1 if (PFS7-4 == 0xf) + * O13=PFS6*PFS7*(PFS5&PFS4) + * + * --- PF/M is 1 if MOs have priority, or 0 if playfield has priority + * MO/PF=!PFS7*!(LBD7&LBD6)*!M1*!O13 + * +!PFS7*!(LBD7&LBD6)*!M2*!O13 + * +!PFS7*!(LBD7&LBD6)*!M3*!O13 + * +PFS7*(LBD7&LBD6)*!M1*!O13 + * +PFS7*(LBD7&LBD6)*!M2*!O13 + * +PFS7*(LBD7&LBD6)*!M3*!O13 + * + */ + int o13 = ((pf[x] & 0xf0) == 0xf0); + int mopf = 0; + + /* compute the MO/PF signal */ + if ((!(pf[x] & 0x80) && ((mo[x] & 0xc0) != 0xc0) && ((mo[x] & 0x0e) != 0x00) && !o13) || + ((pf[x] & 0x80) && ((mo[x] & 0xc0) == 0xc0) && ((mo[x] & 0x0e) != 0x00) && !o13)) + mopf = 1; + + /* if MO/PF is 1, we draw the MO */ + if (mopf) + pf[x] = mo[x]; + + /* erase behind ourselves */ + mo[x] = 0; + } + } + return 0; +} |