// license:BSD-3-Clause // copyright-holders:Nicola Salmoria /*************************************************************************** Pang Video Hardware ***************************************************************************/ #include "emu.h" #include "sound/okim6295.h" #include "includes/mitchell.h" /*************************************************************************** Callbacks for the TileMap code ***************************************************************************/ TILE_GET_INFO_MEMBER(mitchell_state::get_tile_info) { uint8_t attr = m_colorram[tile_index]; int code = m_videoram[2 * tile_index] + (m_videoram[2 * tile_index + 1] << 8); SET_TILE_INFO_MEMBER(0, code, attr & 0x7f, (attr & 0x80) ? TILE_FLIPX : 0); } /*************************************************************************** Start the video hardware emulation. ***************************************************************************/ VIDEO_START_MEMBER(mitchell_state,pang) { m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(mitchell_state::get_tile_info)), TILEMAP_SCAN_ROWS, 8, 8, 64, 32); m_bg_tilemap->set_transparent_pen(15); /* OBJ RAM */ m_objram.resize(m_videoram.bytes()); /* Palette RAM */ m_paletteram.resize(2 * m_palette->entries()); m_palette->basemem().set(m_paletteram, ENDIANNESS_LITTLE, 2); save_item(NAME(m_objram)); save_item(NAME(m_paletteram)); } /*************************************************************************** Memory handlers ***************************************************************************/ /*************************************************************************** OBJ / CHAR RAM HANDLERS (BANK 0 = CHAR, BANK 1=OBJ) ***************************************************************************/ WRITE8_MEMBER(mitchell_state::pang_video_bank_w) { /* Bank handler (sets base pointers for video write) (doesn't apply to mgakuen) */ m_video_bank = data; } WRITE8_MEMBER(mitchell_state::mstworld_video_bank_w) { /* Monsters World seems to freak out if more bits are used.. */ m_video_bank = data & 1; } WRITE8_MEMBER(mitchell_state::mgakuen_videoram_w) { m_videoram[offset] = data; m_bg_tilemap->mark_tile_dirty(offset / 2); } READ8_MEMBER(mitchell_state::mgakuen_videoram_r) { return m_videoram[offset]; } WRITE8_MEMBER(mitchell_state::mgakuen_objram_w) { m_objram[offset] = data; } READ8_MEMBER(mitchell_state::mgakuen_objram_r) { return m_objram[offset]; } WRITE8_MEMBER(mitchell_state::pang_videoram_w) { if (m_video_bank) mgakuen_objram_w(space, offset, data); else mgakuen_videoram_w(space, offset, data); } READ8_MEMBER(mitchell_state::pang_videoram_r) { if (m_video_bank) return mgakuen_objram_r(space, offset); else return mgakuen_videoram_r(space, offset); } /*************************************************************************** COLOUR RAM ****************************************************************************/ WRITE8_MEMBER(mitchell_state::pang_colorram_w) { m_colorram[offset] = data; m_bg_tilemap->mark_tile_dirty(offset); } READ8_MEMBER(mitchell_state::pang_colorram_r) { return m_colorram[offset]; } /*************************************************************************** PALETTE HANDLERS (COLOURS: BANK 0 = 0x00-0x3f BANK 1=0x40-0xff) ****************************************************************************/ WRITE8_MEMBER(mitchell_state::pang_gfxctrl_w) { logerror("PC %04x: pang_gfxctrl_w %02x\n",m_maincpu->pc(),data); { #if 0 char baf[40]; sprintf(baf,"%02x",data); popmessage(baf); #endif } /* bit 0 is unknown (used, maybe back color enable?) */ /* bit 1 is coin counter */ machine().bookkeeping().coin_counter_w(0, data & 2); /* bit 2 is flip screen */ if (m_flipscreen != (data & 0x04)) { m_flipscreen = data & 0x04; machine().tilemap().set_flip_all(m_flipscreen ? (TILEMAP_FLIPY | TILEMAP_FLIPX) : 0); } /* bit 3 is unknown (used, e.g. marukin pulses it on the title screen) */ /* bit 4 selects OKI M6295 bank */ if (m_oki != nullptr) m_oki->set_rom_bank((data >> 4) & 1); /* bit 5 is palette RAM bank selector (doesn't apply to mgakuen) */ m_paletteram_bank = data & 0x20; /* bits 6 and 7 are unknown, used in several places. At first I thought */ /* they were bg and sprites enable, but this screws up spang (screen flickers */ /* every time you pop a bubble). However, not using them as enable bits screws */ /* up marukin - you can see partially built up screens during attract mode. */ } WRITE8_MEMBER(mitchell_state::pangbl_gfxctrl_w) { logerror("PC %04x: pang_gfxctrl_w %02x\n",m_maincpu->pc(),data); { #if 0 char baf[40]; sprintf(baf,"%02x",data); popmessage(baf); #endif } /* bit 0 is unknown (used, maybe back color enable?) */ /* bit 1 is coin counter */ machine().bookkeeping().coin_counter_w(0, data & 2); /* bit 2 is flip screen */ if (m_flipscreen != (data & 0x04)) { m_flipscreen = data & 0x04; machine().tilemap().set_flip_all(m_flipscreen ? (TILEMAP_FLIPY | TILEMAP_FLIPX) : 0); } /* bit 3 is unknown (used, e.g. marukin pulses it on the title screen) */ /* bit 4 selects OKI M6295 bank, nop'ed here */ /* bit 5 is palette RAM bank selector (doesn't apply to mgakuen) */ m_paletteram_bank = data & 0x20; /* bits 6 and 7 are unknown, used in several places. At first I thought */ /* they were bg and sprites enable, but this screws up spang (screen flickers */ /* every time you pop a bubble). However, not using them as enable bits screws */ /* up marukin - you can see partially built up screens during attract mode. */ } WRITE8_MEMBER(mitchell_state::mstworld_gfxctrl_w) { logerror("PC %04x: pang_gfxctrl_w %02x\n",m_maincpu->pc(),data); { char baf[40]; sprintf(baf,"%02x",data); // popmessage(baf); } /* bit 0 is unknown (used, maybe back color enable?) */ /* bit 1 is coin counter */ machine().bookkeeping().coin_counter_w(0, data & 2); /* bit 2 is flip screen */ if (m_flipscreen != (data & 0x04)) { m_flipscreen = data & 0x04; machine().tilemap().set_flip_all(m_flipscreen ? (TILEMAP_FLIPY | TILEMAP_FLIPX) : 0); } /* bit 3 is unknown (used, e.g. marukin pulses it on the title screen) */ /* bit 4 here does not select OKI M6295 bank: mstworld has its own z80 + sound banking */ /* bit 5 is palette RAM bank selector (doesn't apply to mgakuen) */ m_paletteram_bank = data & 0x20; /* bits 6 and 7 are unknown, used in several places. At first I thought */ /* they were bg and sprites enable, but this screws up spang (screen flickers */ /* every time you pop a bubble). However, not using them as enable bits screws */ /* up marukin - you can see partially built up screens during attract mode. */ } WRITE8_MEMBER(mitchell_state::pang_paletteram_w) { m_palette->write8(offset + (m_paletteram_bank ? 0x800 : 0x000), data); } READ8_MEMBER(mitchell_state::pang_paletteram_r) { return m_paletteram[offset + (m_paletteram_bank ? 0x800 : 0x000)]; } /*************************************************************************** Display refresh ***************************************************************************/ void mitchell_state::draw_sprites( bitmap_ind16 &bitmap, const rectangle &cliprect ) { int offs, sx, sy; /* the last entry is not a sprite, we skip it otherwise spang shows a bubble */ /* moving diagonally across the screen */ for (offs = 0x1000 - 0x40; offs >= 0; offs -= 0x20) { int code = m_objram[offs]; int attr = m_objram[offs + 1]; int color = attr & 0x0f; sx = m_objram[offs + 3] + ((attr & 0x10) << 4); sy = ((m_objram[offs + 2] + 8) & 0xff) - 8; code += (attr & 0xe0) << 3; if (m_flipscreen) { sx = 496 - sx; sy = 240 - sy; } m_gfxdecode->gfx(1)->transpen(bitmap,cliprect, code, color, m_flipscreen, m_flipscreen, sx,sy,15); } } uint32_t mitchell_state::screen_update_pang(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) { bitmap.fill(0, cliprect); m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0); draw_sprites(bitmap, cliprect); return 0; }