// license:BSD-3-Clause // copyright-holders:Nicola Salmoria #include "emu.h" #include "includes/mjkjidai.h" /*************************************************************************** Callbacks for the TileMap code ***************************************************************************/ TILE_GET_INFO_MEMBER(mjkjidai_state::get_tile_info) { int attr = m_videoram[tile_index + 0x800]; int code = m_videoram[tile_index] + ((attr & 0x1f) << 8); int color = m_videoram[tile_index + 0x1000]; tileinfo.set(0, code, color >> 3, 0); } /*************************************************************************** Start the video hardware emulation. ***************************************************************************/ void mjkjidai_state::video_start() { m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(mjkjidai_state::get_tile_info)), TILEMAP_SCAN_ROWS, 8, 8, 64, 32); } /*************************************************************************** Memory handlers ***************************************************************************/ void mjkjidai_state::videoram_w(offs_t offset, uint8_t data) { m_videoram[offset] = data; m_bg_tilemap->mark_tile_dirty(offset & 0x7ff); } void mjkjidai_state::ctrl_w(uint8_t data) { // logerror("%s: port c0 = %02x\n", m_maincpu->pc(), data); // bit 0 = NMI enable m_nmi_enable = data & 1; if (!m_nmi_enable) m_maincpu->set_input_line(INPUT_LINE_NMI, CLEAR_LINE); // bit 1 = flip screen flip_screen_set(data & 0x02); // bit 2 = display enable m_display_enable = data & 0x04; // bit 5 = coin counter machine().bookkeeping().coin_counter_w(0, data & 0x20); // bits 6-7 select ROM bank m_mainbank->set_entry(data >> 6); } /*************************************************************************** Display refresh ***************************************************************************/ void mjkjidai_state::draw_sprites(bitmap_ind16 &bitmap, const rectangle &cliprect) { uint8_t *spriteram = &m_videoram[0]; uint8_t *spriteram_2 = &m_videoram[0x800]; uint8_t *spriteram_3 = &m_videoram[0x1000]; for (int offs = 0x20 - 2; offs >= 0; offs -= 2) { int code = spriteram[offs] + ((spriteram_2[offs] & 0x1f) << 8); int color = (spriteram_3[offs] & 0x78) >> 3; int sx = 2 * spriteram_2[offs + 1]; int sy = 240 - spriteram[offs + 1]; int flipx = code & 1; int flipy = code & 2; code >>= 2; sx += (spriteram_2[offs] & 0x20) >> 5; // not sure about this if (flip_screen()) { sx = 496 - sx; sy = 240 - sy; flipx = !flipx; flipy = !flipy; } sx += 16; sy += 1; m_gfxdecode->gfx(1)->transpen(bitmap, cliprect, code, color, flipx, flipy, sx, sy, 0); } } uint32_t mjkjidai_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) { if (!m_display_enable) bitmap.fill(m_palette->black_pen(), cliprect); else { m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0); draw_sprites(bitmap, cliprect); } return 0; }