// license:BSD-3-Clause // copyright-holders:Phil Stroffolino /*************************************************************************** video/lkage.c lkage_scroll[0x00]: text layer horizontal scroll lkage_scroll[0x01]: text layer vertical scroll lkage_scroll[0x02]: foreground layer horizontal scroll lkage_scroll[0x03]: foreground layer vertical scroll lkage_scroll[0x04]: background layer horizontal scroll lkage_scroll[0x05]: background layer vertical scroll lkage_vreg[0]: 0x00,0x04 0x02: tx tile bank select (bygone only?) 0x04: fg tile bank select 0x08: ? lkage_vreg[1]: 0x7d 0xf0: background/foreground palette select 0x08: bg tile bank select 0x07: priority config? lkage_vreg[2]: 0xf3 0x03: flip screen x/y 0xf0: normally 1111, but 1001 and 0001 inbetween stages (while the backgrounds are are being redrawn). These bits are probably used to enable individual layers, but we have no way of knowing the mapping. lkage_vreg: 04 7d f3 : title screen 101 0c 7d f3 : high score 101 04 06 f3 : attract#1 110 04 1e f3 : attract#2 110 04 1e f3 : attract#3 110 00 4e f3 : attract#4 110 ***************************************************************************/ #include "emu.h" #include "includes/lkage.h" #include "screen.h" WRITE8_MEMBER(lkage_state::lkage_videoram_w) { m_videoram[offset] = data; switch (offset / 0x400) { case 0: m_tx_tilemap->mark_tile_dirty(offset & 0x3ff); break; case 1: m_fg_tilemap->mark_tile_dirty(offset & 0x3ff); break; case 2: m_bg_tilemap->mark_tile_dirty(offset & 0x3ff); break; default: break; } } TILE_GET_INFO_MEMBER(lkage_state::get_bg_tile_info) { int code = m_videoram[tile_index + 0x800] + 256 * (m_bg_tile_bank ? 5 : 1); SET_TILE_INFO_MEMBER(0/*gfx*/, code, 0/*color*/, 0/*flags*/ ); } TILE_GET_INFO_MEMBER(lkage_state::get_fg_tile_info) { int code = m_videoram[tile_index + 0x400] + 256 * (m_fg_tile_bank ? 1 : 0); SET_TILE_INFO_MEMBER(0/*gfx*/, code, 0/*color*/, 0/*flags*/); } TILE_GET_INFO_MEMBER(lkage_state::get_tx_tile_info) { int code = m_videoram[tile_index] + 256 * (m_tx_tile_bank ? 4 : 0); SET_TILE_INFO_MEMBER(0/*gfx*/, code, 0/*color*/, 0/*flags*/); } void lkage_state::video_start() { m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(lkage_state::get_bg_tile_info)), TILEMAP_SCAN_ROWS, 8, 8, 32, 32); m_fg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(lkage_state::get_fg_tile_info)), TILEMAP_SCAN_ROWS, 8, 8, 32, 32); m_tx_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(lkage_state::get_tx_tile_info)), TILEMAP_SCAN_ROWS, 8, 8, 32, 32); m_fg_tilemap->set_transparent_pen(0); m_tx_tilemap->set_transparent_pen(0); m_bg_tilemap->set_scrolldx(-5, -5 + 24); m_fg_tilemap->set_scrolldx(-3, -3 + 24); m_tx_tilemap->set_scrolldx(-1, -1 + 24); } void lkage_state::draw_sprites( screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect ) { const uint8_t *source = m_spriteram; const uint8_t *finish = source + 0x60; while (source < finish) { int attributes = source[2]; /* 0x01: horizontal flip * 0x02: vertical flip * 0x04: bank select * 0x08: sprite size * 0x70: color * 0x80: priority */ int priority_mask = 0; int color = (attributes >> 4) & 7; int flipx = attributes & 0x01; int flipy = attributes & 0x02; int height = (attributes & 0x08) ? 2 : 1; int sx = source[0] - 15 + m_sprite_dx; int sy = 256 - 16 * height - source[1]; int sprite_number = source[3] + ((attributes & 0x04) << 6); int y; if (attributes & 0x80) { priority_mask = (0xf0 | 0xcc); } else { priority_mask = 0xf0; } if (flip_screen_x()) { sx = 239 - sx - 24; flipx = !flipx; } if (flip_screen_y()) { sy = 254 - 16 * height - sy; flipy = !flipy; } if (height == 2 && !flipy) { sprite_number ^= 1; } for (y = 0; y < height; y++) { m_gfxdecode->gfx(1)->prio_transpen( bitmap, cliprect, sprite_number ^ y, color, flipx,flipy, sx&0xff, sy + 16*y, screen.priority(), priority_mask,0 ); } source += 4; } } uint32_t lkage_state::screen_update_lkage(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) { int bank; flip_screen_x_set(~m_vreg[2] & 0x01); flip_screen_y_set(~m_vreg[2] & 0x02); bank = m_vreg[1] & 0x08; if (m_bg_tile_bank != bank) { m_bg_tile_bank = bank; m_bg_tilemap->mark_all_dirty(); } bank = m_vreg[0]&0x04; if (m_fg_tile_bank != bank) { m_fg_tile_bank = bank; m_fg_tilemap->mark_all_dirty(); } bank = m_vreg[0]&0x02; if (m_tx_tile_bank != bank) { m_tx_tile_bank = bank; m_tx_tilemap->mark_all_dirty(); } m_bg_tilemap->set_palette_offset(0x300 + (m_vreg[1] & 0xf0)); m_fg_tilemap->set_palette_offset(0x200 + (m_vreg[1] & 0xf0)); m_tx_tilemap->set_palette_offset(0x110); m_tx_tilemap->set_scrollx(0, m_scroll[0]); m_tx_tilemap->set_scrolly(0, m_scroll[1]); m_fg_tilemap->set_scrollx(0, m_scroll[2]); m_fg_tilemap->set_scrolly(0, m_scroll[3]); m_bg_tilemap->set_scrollx(0, m_scroll[4]); m_bg_tilemap->set_scrolly(0, m_scroll[5]); screen.priority().fill(0, cliprect); if ((m_vreg[2] & 0xf0) == 0xf0) { m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 1); m_fg_tilemap->draw(screen, bitmap, cliprect, 0, (m_vreg[1] & 2) ? 2 : 4); m_tx_tilemap->draw(screen, bitmap, cliprect, 0, 4); draw_sprites(screen, bitmap, cliprect); } else { m_tx_tilemap->draw(screen, bitmap, cliprect, TILEMAP_DRAW_OPAQUE, 0); } return 0; }