/*************************************************************************** Atari System 1 hardware ****************************************************************************/ #include "driver.h" #include "machine/atarigen.h" #include "atarisy1.h" /************************************* * * Constants * *************************************/ /* the color and remap PROMs are mapped as follows */ #define PROM1_BANK_4 0x80 /* active low */ #define PROM1_BANK_3 0x40 /* active low */ #define PROM1_BANK_2 0x20 /* active low */ #define PROM1_BANK_1 0x10 /* active low */ #define PROM1_OFFSET_MASK 0x0f /* postive logic */ #define PROM2_BANK_6_OR_7 0x80 /* active low */ #define PROM2_BANK_5 0x40 /* active low */ #define PROM2_PLANE_5_ENABLE 0x20 /* active high */ #define PROM2_PLANE_4_ENABLE 0x10 /* active high */ #define PROM2_PF_COLOR_MASK 0x0f /* negative logic */ #define PROM2_BANK_7 0x08 /* active low, plus PROM2_BANK_6_OR_7 low as well */ #define PROM2_MO_COLOR_MASK 0x07 /* negative logic */ /************************************* * * Globals we own * *************************************/ UINT16 *atarisy1_bankselect; /************************************* * * Statics * *************************************/ /* playfield parameters */ static UINT16 playfield_lookup[256]; static UINT8 playfield_tile_bank; static UINT16 playfield_priority_pens; static mame_timer *yscroll_reset_timer; /* INT3 tracking */ static int next_timer_scanline; static mame_timer *scanline_timer; static mame_timer *int3off_timer; /* graphics bank tracking */ static UINT8 bank_gfx[3][8]; static UINT8 bank_color_shift[MAX_GFX_ELEMENTS]; /* basic form of a graphics bank */ static gfx_layout objlayout = { 8,8, /* 8*8 sprites */ 4096, /* 4096 of them */ 6, /* 6 bits per pixel */ { 5*8*0x10000, 4*8*0x10000, 3*8*0x10000, 2*8*0x10000, 1*8*0x10000, 0*8*0x10000 }, { 0, 1, 2, 3, 4, 5, 6, 7 }, { 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8 }, 8*8 /* every sprite takes 8 consecutive bytes */ }; /************************************* * * Prototypes * *************************************/ static void update_timers(int scanline); static void decode_gfx(running_machine *machine, UINT16 *pflookup, UINT16 *molookup); static int get_bank(running_machine *machine, UINT8 prom1, UINT8 prom2, int bpp); static TIMER_CALLBACK( int3_callback ); static TIMER_CALLBACK( int3off_callback ); static TIMER_CALLBACK( reset_yscroll_callback ); /************************************* * * Tilemap callbacks * *************************************/ static TILE_GET_INFO( get_alpha_tile_info ) { UINT16 data = atarigen_alpha[tile_index]; int code = data & 0x3ff; int color = (data >> 10) & 0x07; int opaque = data & 0x2000; SET_TILE_INFO(0, code, color, opaque ? TILE_FORCE_LAYER0 : 0); } static TILE_GET_INFO( get_playfield_tile_info ) { UINT16 data = atarigen_playfield[tile_index]; UINT16 lookup = playfield_lookup[((data >> 8) & 0x7f) | (playfield_tile_bank << 7)]; int gfxindex = (lookup >> 8) & 15; int code = ((lookup & 0xff) << 8) | (data & 0xff); int color = 0x20 + (((lookup >> 12) & 15) << bank_color_shift[gfxindex]); SET_TILE_INFO(gfxindex, code, color, (data >> 15) & 1); } /************************************* * * Generic video system start * *************************************/ VIDEO_START( atarisy1 ) { static const struct atarimo_desc modesc = { 0, /* index to which gfx system */ 8, /* 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? */ 0, /* pixels per SLIP entry (0 for no-slip) */ 0, /* pixel offset for SLIPs */ 0x38, /* maximum number of links to visit/scanline (0=all) */ 0x100, /* base palette entry */ 0x100, /* maximum number of colors */ 0, /* transparent pen index */ {{ 0,0,0,0x003f }}, /* mask for the link */ {{ 0,0xff00,0,0 }}, /* mask for the graphics bank */ {{ 0,0xffff,0,0 }}, /* mask for the code index */ {{ 0 }}, /* mask for the upper code index */ {{ 0,0xff00,0,0 }}, /* mask for the color */ {{ 0,0,0x3fe0,0 }}, /* mask for the X position */ {{ 0x3fe0,0,0,0 }}, /* mask for the Y position */ {{ 0 }}, /* mask for the width, in tiles*/ {{ 0x000f,0,0,0 }}, /* mask for the height, in tiles */ {{ 0x8000,0,0,0 }}, /* mask for the horizontal flip */ {{ 0 }}, /* mask for the vertical flip */ {{ 0,0,0x8000,0 }}, /* mask for the priority */ {{ 0 }}, /* mask for the neighbor */ {{ 0 }}, /* mask for absolute coordinates */ {{ 0,0xffff,0,0 }}, /* mask for the special value */ 0xffff, /* resulting value to indicate "special" */ 0 /* callback routine for special entries */ }; UINT16 motable[256]; UINT16 *codelookup; UINT8 *colorlookup, *gfxlookup; int i, size; /* first decode the graphics */ decode_gfx(machine, playfield_lookup, motable); /* initialize the playfield */ atarigen_playfield_tilemap = tilemap_create(get_playfield_tile_info, tilemap_scan_rows, 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 */ codelookup = atarimo_get_code_lookup(0, &size); for (i = 0; i < size; i++) codelookup[i] = (i & 0xff) | ((motable[i >> 8] & 0xff) << 8); /* modify the motion object color and gfx lookups */ colorlookup = atarimo_get_color_lookup(0, &size); gfxlookup = atarimo_get_gfx_lookup(0, &size); for (i = 0; i < size; i++) { colorlookup[i] = ((motable[i] >> 12) & 15) << 1; gfxlookup[i] = (motable[i] >> 8) & 15; } /* reset the statics */ atarimo_set_yscroll(0, 256); next_timer_scanline = -1; scanline_timer = mame_timer_alloc(int3_callback); int3off_timer = mame_timer_alloc(int3off_callback); yscroll_reset_timer = mame_timer_alloc(reset_yscroll_callback); } /************************************* * * Graphics bank selection * *************************************/ WRITE16_HANDLER( atarisy1_bankselect_w ) { UINT16 oldselect = *atarisy1_bankselect; UINT16 newselect = oldselect, diff; int scanline = video_screen_get_vpos(0); /* update memory */ COMBINE_DATA(&newselect); diff = oldselect ^ newselect; /* sound CPU reset */ if (diff & 0x0080) { cpunum_set_input_line(1, INPUT_LINE_RESET, (newselect & 0x0080) ? CLEAR_LINE : ASSERT_LINE); if (!(newselect & 0x0080)) atarigen_sound_reset(); } /* if MO or playfield banks change, force a partial update */ if (diff & 0x003c) video_screen_update_partial(0, scanline); /* motion object bank select */ atarimo_set_bank(0, (newselect >> 3) & 7); update_timers(scanline); /* playfield bank select */ if (diff & 0x0004) { playfield_tile_bank = (newselect >> 2) & 1; tilemap_mark_all_tiles_dirty(atarigen_playfield_tilemap); } /* stash the new value */ *atarisy1_bankselect = newselect; } /************************************* * * Playfield priority pens * *************************************/ WRITE16_HANDLER( atarisy1_priority_w ) { UINT16 oldpens = playfield_priority_pens; UINT16 newpens = oldpens; /* force a partial update in case this changes mid-screen */ COMBINE_DATA(&newpens); if (oldpens != newpens) video_screen_update_partial(0, video_screen_get_vpos(0)); playfield_priority_pens = newpens; } /************************************* * * Playfield horizontal scroll * *************************************/ WRITE16_HANDLER( atarisy1_xscroll_w ) { UINT16 oldscroll = *atarigen_xscroll; UINT16 newscroll = oldscroll; /* force a partial update in case this changes mid-screen */ COMBINE_DATA(&newscroll); if (oldscroll != newscroll) video_screen_update_partial(0, video_screen_get_vpos(0)); /* set the new scroll value */ tilemap_set_scrollx(atarigen_playfield_tilemap, 0, newscroll); /* update the data */ *atarigen_xscroll = newscroll; } /************************************* * * Playfield vertical scroll * *************************************/ static TIMER_CALLBACK( reset_yscroll_callback ) { tilemap_set_scrolly(atarigen_playfield_tilemap, 0, param); } WRITE16_HANDLER( atarisy1_yscroll_w ) { UINT16 oldscroll = *atarigen_yscroll; UINT16 newscroll = oldscroll; int scanline = video_screen_get_vpos(0); int adjusted_scroll; /* force a partial update in case this changes mid-screen */ COMBINE_DATA(&newscroll); video_screen_update_partial(0, scanline); /* because this latches a new value into the scroll base, we need to adjust for the scanline */ adjusted_scroll = newscroll; if (scanline <= Machine->screen[0].visarea.max_y) adjusted_scroll -= (scanline + 1); tilemap_set_scrolly(atarigen_playfield_tilemap, 0, adjusted_scroll); /* but since we've adjusted it, we must reset it to the normal value once we hit scanline 0 again */ mame_timer_adjust(yscroll_reset_timer, video_screen_get_time_until_pos(0, 0, 0), newscroll, time_zero); /* update the data */ *atarigen_yscroll = newscroll; } /************************************* * * Sprite RAM write handler * *************************************/ WRITE16_HANDLER( atarisy1_spriteram_w ) { int active_bank = atarimo_get_bank(0); int oldword = atarimo_0_spriteram[offset]; int newword = oldword; COMBINE_DATA(&newword); /* if the data changed, and it modified the live sprite bank, do some extra work */ if (oldword != newword && (offset >> 8) == active_bank) { /* if modifying a timer, beware */ if (((offset & 0xc0) == 0x00 && atarimo_0_spriteram[offset | 0x40] == 0xffff) || ((offset & 0xc0) == 0x40 && (newword == 0xffff || oldword == 0xffff))) { /* if the timer is in the active bank, update the display list */ atarimo_0_spriteram_w(offset, data, 0); update_timers(video_screen_get_vpos(0)); } /* if we're about to modify data in the active sprite bank, make sure the video is up-to-date */ /* Road Runner needs this to work; note the +2 kludge -- +1 would be correct since the video */ /* renders the next scanline's sprites to the line buffers, but Road Runner still glitches */ /* without the extra +1 */ else video_screen_update_partial(0, video_screen_get_vpos(0) + 2); } /* let the MO handler do the basic work */ atarimo_0_spriteram_w(offset, data, 0); } /************************************* * * MO interrupt handlers * *************************************/ static TIMER_CALLBACK( int3off_callback ) { /* clear the state */ atarigen_scanline_int_ack_w(0, 0, 0); } static TIMER_CALLBACK( int3_callback ) { int scanline = param; /* update the state */ atarigen_scanline_int_gen(); /* set a timer to turn it off */ mame_timer_adjust(int3off_timer, video_screen_get_scan_period(0), 0, time_zero); /* determine the time of the next one */ next_timer_scanline = -1; update_timers(scanline); } /************************************* * * MO interrupt state read * *************************************/ READ16_HANDLER( atarisy1_int3state_r ) { return atarigen_scanline_int_state ? 0x0080 : 0x0000; } /************************************* * * Timer updater * *************************************/ static void update_timers(int scanline) { UINT16 *base = &atarimo_0_spriteram[atarimo_get_bank(0) * 64 * 4]; int link = 0, best = scanline, found = 0; UINT8 spritevisit[64]; /* track which ones we've visited */ memset(spritevisit, 0, sizeof(spritevisit)); /* walk the list until we loop */ while (!spritevisit[link]) { /* timers are indicated by 0xffff in entry 2 */ if (base[link + 0x40] == 0xffff) { int data = base[link]; int vsize = (data & 15) + 1; int ypos = (256 - (data >> 5) - vsize * 8 - 1) & 0x1ff; /* note that we found something */ found = 1; /* is this a better entry than the best so far? */ if (best <= scanline) { if ((ypos <= scanline && ypos < best) || ypos > scanline) best = ypos; } else { if (ypos < best) best = ypos; } } /* link to the next */ spritevisit[link] = 1; link = base[link + 0xc0] & 0x3f; } /* if nothing was found, use scanline -1 */ if (!found) best = -1; /* update the timer */ if (best != next_timer_scanline) { next_timer_scanline = best; /* set a new one */ if (best != -1) mame_timer_adjust(scanline_timer, video_screen_get_time_until_pos(0, best, 0), best, time_zero); else mame_timer_adjust(scanline_timer, time_never, 0, time_zero); } } /************************************* * * Main refresh * *************************************/ VIDEO_UPDATE( atarisy1 ) { 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]) { /* high priority MO? */ if (mo[x] & ATARIMO_PRIORITY_MASK) { /* only gets priority if MO pen is not 1 */ if ((mo[x] & 0x0f) != 1) pf[x] = 0x300 + ((pf[x] & 0x0f) << 4) + (mo[x] & 0x0f); } /* low priority */ else { /* priority pens for playfield color 0 */ if ((pf[x] & 0xf8) != 0 || !(playfield_priority_pens & (1 << (pf[x] & 0x07)))) 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; } /************************************* * * Graphics decoding * *************************************/ static void decode_gfx(running_machine *machine, UINT16 *pflookup, UINT16 *molookup) { UINT8 *prom1 = &memory_region(REGION_PROMS)[0x000]; UINT8 *prom2 = &memory_region(REGION_PROMS)[0x200]; int obj, i; /* reset the globals */ memset(&bank_gfx[0][0], 0, sizeof(bank_gfx)); /* loop for two sets of objects */ for (obj = 0; obj < 2; obj++) { /* loop for 256 objects in the set */ for (i = 0; i < 256; i++, prom1++, prom2++) { int bank, bpp, color, offset; /* determine the bpp */ bpp = 4; if (*prom2 & PROM2_PLANE_4_ENABLE) { bpp = 5; if (*prom2 & PROM2_PLANE_5_ENABLE) bpp = 6; } /* determine the offset */ offset = *prom1 & PROM1_OFFSET_MASK; /* determine the bank */ bank = get_bank(machine, *prom1, *prom2, bpp); /* set the value */ if (obj == 0) { /* playfield case */ color = (~*prom2 & PROM2_PF_COLOR_MASK) >> (bpp - 4); if (bank == 0) { bank = 1; offset = color = 0; } pflookup[i] = offset | (bank << 8) | (color << 12); } else { /* motion objects (high bit ignored) */ color = (~*prom2 & PROM2_MO_COLOR_MASK) >> (bpp - 4); molookup[i] = offset | (bank << 8) | (color << 12); } } } } /************************************* * * Graphics bank mapping * *************************************/ static int get_bank(running_machine *machine, UINT8 prom1, UINT8 prom2, int bpp) { int bank_index, i, gfx_index; /* determine the bank index */ if ((prom1 & PROM1_BANK_1) == 0) bank_index = 1; else if ((prom1 & PROM1_BANK_2) == 0) bank_index = 2; else if ((prom1 & PROM1_BANK_3) == 0) bank_index = 3; else if ((prom1 & PROM1_BANK_4) == 0) bank_index = 4; else if ((prom2 & PROM2_BANK_5) == 0) bank_index = 5; else if ((prom2 & PROM2_BANK_6_OR_7) == 0) { if ((prom2 & PROM2_BANK_7) == 0) bank_index = 7; else bank_index = 6; } else return 0; /* find the bank */ if (bank_gfx[bpp - 4][bank_index]) return bank_gfx[bpp - 4][bank_index]; /* if the bank is out of range, call it 0 */ if (0x80000 * (bank_index - 1) >= memory_region_length(REGION_GFX2)) return 0; /* don't have one? let's make it ... first find any empty slot */ for (gfx_index = 0; gfx_index < MAX_GFX_ELEMENTS; gfx_index++) if (machine->gfx[gfx_index] == NULL) break; assert(gfx_index != MAX_GFX_ELEMENTS); /* tweak the structure for the number of bitplanes we have */ objlayout.planes = bpp; for (i = 0; i < bpp; i++) objlayout.planeoffset[i] = (bpp - i - 1) * 0x10000 * 8; /* decode the graphics */ machine->gfx[gfx_index] = allocgfx(&objlayout); decodegfx(machine->gfx[gfx_index], &memory_region(REGION_GFX2)[0x80000 * (bank_index - 1)], 0, machine->gfx[gfx_index]->total_elements); /* set the color information */ machine->gfx[gfx_index]->color_base = 256; machine->gfx[gfx_index]->color_granularity = 8; machine->gfx[gfx_index]->total_colors = 0x40; bank_color_shift[gfx_index] = bpp - 3; /* set the entry and return it */ return bank_gfx[bpp - 4][bank_index] = gfx_index; }