// license:BSD-3-Clause // copyright-holders:Aaron Giles /*************************************************************************** Atari System 1 hardware ****************************************************************************/ #include "emu.h" #include "includes/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 */ /************************************* * * Statics * *************************************/ static const gfx_layout objlayout_4bpp = { 8,8, /* 8*8 sprites */ 4096, /* 4096 of them */ 4, /* 4 bits per pixel */ { 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 */ }; static const gfx_layout objlayout_5bpp = { 8,8, /* 8*8 sprites */ 4096, /* 4096 of them */ 5, /* 5 bits per pixel */ { 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 */ }; static const gfx_layout objlayout_6bpp = { 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 */ }; /************************************* * * Tilemap callbacks * *************************************/ TILE_GET_INFO_MEMBER(atarisy1_state::get_alpha_tile_info) { uint16_t data = m_alpha_tilemap->basemem_read(tile_index); int code = data & 0x3ff; int color = (data >> 10) & 0x07; int opaque = data & 0x2000; SET_TILE_INFO_MEMBER(0, code, color, opaque ? TILE_FORCE_LAYER0 : 0); } TILE_GET_INFO_MEMBER(atarisy1_state::get_playfield_tile_info) { uint16_t data = m_playfield_tilemap->basemem_read(tile_index); uint16_t lookup = m_playfield_lookup[((data >> 8) & 0x7f) | (m_playfield_tile_bank << 7)]; int gfxindex = (lookup >> 8) & 15; int code = ((lookup & 0xff) << 8) | (data & 0xff); int color = 0x20 + (((lookup >> 12) & 15) << m_bank_color_shift[gfxindex]); SET_TILE_INFO_MEMBER(gfxindex, code, color, (data >> 15) & 1); } /************************************* * * Generic video system start * *************************************/ const atari_motion_objects_config atarisy1_state::s_mob_config = { 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 */ {{ 0,0xffff,0,0 }}, /* mask for the 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" */ }; VIDEO_START_MEMBER(atarisy1_state,atarisy1) { /* first decode the graphics */ uint16_t motable[256]; decode_gfx(m_playfield_lookup, motable); /* modify the motion object code lookup */ std::vector &codelookup = m_mob->code_lookup(); for (unsigned int i = 0; i < codelookup.size(); i++) codelookup[i] = (i & 0xff) | ((motable[i >> 8] & 0xff) << 8); /* modify the motion object color and gfx lookups */ std::vector &colorlookup = m_mob->color_lookup(); std::vector &gfxlookup = m_mob->gfx_lookup(); for (unsigned int i = 0; i < colorlookup.size(); i++) { colorlookup[i] = ((motable[i] >> 12) & 15) << 1; gfxlookup[i] = (motable[i] >> 8) & 15; } /* reset the statics */ m_mob->set_yscroll(256); m_next_timer_scanline = -1; /* save state */ save_item(NAME(m_playfield_tile_bank)); save_item(NAME(m_playfield_priority_pens)); save_item(NAME(m_next_timer_scanline)); } /************************************* * * Graphics bank selection * *************************************/ WRITE16_MEMBER( atarisy1_state::atarisy1_bankselect_w ) { uint16_t oldselect = *m_bankselect; uint16_t newselect = oldselect, diff; int scanline = m_screen->vpos(); /* update memory */ COMBINE_DATA(&newselect); diff = oldselect ^ newselect; /* sound CPU reset */ if (BIT(diff, 7)) { m_outlatch->clear_w(BIT(newselect, 7)); m_audiocpu->set_input_line(INPUT_LINE_RESET, BIT(newselect, 7) ? CLEAR_LINE : ASSERT_LINE); if (!BIT(newselect, 7)) m_soundcomm->sound_cpu_reset(); } /* if MO or playfield banks change, force a partial update */ if (diff & 0x003c) m_screen->update_partial(scanline); /* motion object bank select */ m_mob->set_bank((newselect >> 3) & 7); update_timers(scanline); /* playfield bank select */ if (diff & 0x0004) { m_playfield_tile_bank = (newselect >> 2) & 1; m_playfield_tilemap->mark_all_dirty(); } /* stash the new value */ *m_bankselect = newselect; } /************************************* * * Playfield priority pens * *************************************/ WRITE16_MEMBER( atarisy1_state::atarisy1_priority_w ) { uint16_t oldpens = m_playfield_priority_pens; uint16_t newpens = oldpens; /* force a partial update in case this changes mid-screen */ COMBINE_DATA(&newpens); if (oldpens != newpens) m_screen->update_partial(m_screen->vpos()); m_playfield_priority_pens = newpens; } /************************************* * * Playfield horizontal scroll * *************************************/ WRITE16_MEMBER( atarisy1_state::atarisy1_xscroll_w ) { uint16_t oldscroll = *m_xscroll; uint16_t newscroll = oldscroll; /* force a partial update in case this changes mid-screen */ COMBINE_DATA(&newscroll); if (oldscroll != newscroll) m_screen->update_partial(m_screen->vpos()); /* set the new scroll value */ m_playfield_tilemap->set_scrollx(0, newscroll); /* update the data */ *m_xscroll = newscroll; } /************************************* * * Playfield vertical scroll * *************************************/ TIMER_DEVICE_CALLBACK_MEMBER(atarisy1_state::atarisy1_reset_yscroll_callback) { m_playfield_tilemap->set_scrolly(0, param); } WRITE16_MEMBER( atarisy1_state::atarisy1_yscroll_w ) { uint16_t oldscroll = *m_yscroll; uint16_t newscroll = oldscroll; int scanline = m_screen->vpos(); int adjusted_scroll; /* force a partial update in case this changes mid-screen */ COMBINE_DATA(&newscroll); m_screen->update_partial(scanline); /* because this latches a new value into the scroll base, we need to adjust for the scanline */ adjusted_scroll = newscroll; if (scanline <= m_screen->visible_area().max_y) adjusted_scroll -= (scanline + 1); m_playfield_tilemap->set_scrolly(0, adjusted_scroll); /* but since we've adjusted it, we must reset it to the normal value once we hit scanline 0 again */ m_yscroll_reset_timer->adjust(m_screen->time_until_pos(0), newscroll); /* update the data */ *m_yscroll = newscroll; } /************************************* * * Sprite RAM write handler * *************************************/ WRITE16_MEMBER( atarisy1_state::atarisy1_spriteram_w ) { int active_bank = m_mob->bank(); uint16_t *spriteram = m_mob->spriteram(); int oldword = 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 && spriteram[offset | 0x40] == 0xffff) || ((offset & 0xc0) == 0x40 && (newword == 0xffff || oldword == 0xffff))) { /* if the timer is in the active bank, update the display list */ spriteram[offset] = data; update_timers(m_screen->vpos()); } /* 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 m_screen->update_partial(m_screen->vpos() + 2); } /* let the MO handler do the basic work */ spriteram[offset] = data; } /************************************* * * MO interrupt handlers * *************************************/ TIMER_DEVICE_CALLBACK_MEMBER(atarisy1_state::atarisy1_int3off_callback) { address_space &space = m_maincpu->space(AS_PROGRAM); /* clear the state */ scanline_int_ack_w(space, 0, 0); } TIMER_DEVICE_CALLBACK_MEMBER(atarisy1_state::atarisy1_int3_callback) { int scanline = param; /* update the state */ scanline_int_gen(*m_maincpu); /* set a timer to turn it off */ m_int3off_timer->adjust(m_screen->scan_period()); /* determine the time of the next one */ m_next_timer_scanline = -1; update_timers(scanline); } /************************************* * * MO interrupt state read * *************************************/ READ16_MEMBER( atarisy1_state::atarisy1_int3state_r ) { return m_scanline_int_state ? 0x0080 : 0x0000; } /************************************* * * Timer updater * *************************************/ void atarisy1_state::update_timers(int scanline) { int offset = m_mob->bank() * 64 * 4; int link = 0, best = scanline, found = 0; uint8_t 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 (m_mob->spriteram()[offset + link + 0x40] == 0xffff) { int data = m_mob->spriteram()[offset + 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 = m_mob->spriteram()[offset + link + 0xc0] & 0x3f; } /* if nothing was found, use scanline -1 */ if (!found) best = -1; /* update the timer */ if (best != m_next_timer_scanline) { m_next_timer_scanline = best; /* set a new one */ if (best != -1) m_scanline_timer->adjust(m_screen->time_until_pos(best), best); else m_scanline_timer->reset(); } } /************************************* * * Main refresh * *************************************/ uint32_t atarisy1_state::screen_update_atarisy1(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) { // start drawing m_mob->draw_async(cliprect); // draw the playfield m_playfield_tilemap->draw(screen, bitmap, cliprect, 0, 0); // draw and merge the MO bitmap_ind16 &mobitmap = m_mob->bitmap(); for (const sparse_dirty_rect *rect = m_mob->first_dirty_rect(cliprect); rect != nullptr; rect = rect->next()) for (int y = rect->min_y; y <= rect->max_y; y++) { uint16_t *mo = &mobitmap.pix16(y); uint16_t *pf = &bitmap.pix16(y); for (int x = rect->min_x; x <= rect->max_x; x++) if (mo[x] != 0xffff) { /* high priority MO? */ if (mo[x] & atari_motion_objects_device::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 || !(m_playfield_priority_pens & (1 << (pf[x] & 0x07)))) pf[x] = mo[x]; } } } /* add the alpha on top */ m_alpha_tilemap->draw(screen, bitmap, cliprect, 0, 0); return 0; } /************************************* * * Graphics decoding * *************************************/ void atarisy1_state::decode_gfx(uint16_t *pflookup, uint16_t *molookup) { uint8_t *prom1 = &memregion("proms")->as_u8(0x000); uint8_t *prom2 = &memregion("proms")->as_u8(0x200); int obj, i; /* reset the globals */ memset(&m_bank_gfx[0][0], 0, sizeof(m_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(*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 * *************************************/ int atarisy1_state::get_bank(uint8_t prom1, uint8_t prom2, int bpp) { const uint8_t *srcdata; int bank_index, 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 (m_bank_gfx[bpp - 4][bank_index]) return m_bank_gfx[bpp - 4][bank_index]; /* if the bank is out of range, call it 0 */ memory_region *tiles = memregion("tiles"); if (0x80000 * (bank_index - 1) >= tiles->bytes()) 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 (m_gfxdecode->gfx(gfx_index) == nullptr) break; assert(gfx_index != MAX_GFX_ELEMENTS); /* decode the graphics */ srcdata = &tiles->as_u8(0x80000 * (bank_index - 1)); switch (bpp) { case 4: m_gfxdecode->set_gfx(gfx_index,std::make_unique(m_palette, objlayout_4bpp, srcdata, 0, 0x40, 256)); break; case 5: m_gfxdecode->set_gfx(gfx_index,std::make_unique(m_palette, objlayout_5bpp, srcdata, 0, 0x40, 256)); break; case 6: m_gfxdecode->set_gfx(gfx_index,std::make_unique(m_palette, objlayout_6bpp, srcdata, 0, 0x40, 256)); break; default: fatalerror("Unsupported bpp\n"); } /* set the color information */ m_gfxdecode->gfx(gfx_index)->set_granularity(8); m_bank_color_shift[gfx_index] = bpp - 3; /* set the entry and return it */ return m_bank_gfx[bpp - 4][bank_index] = gfx_index; }