// license:BSD-3-Clause // copyright-holders:Stefan Jokisch /*************************************************************************** Atari Orbit video emulation ***************************************************************************/ #include "emu.h" #include "includes/orbit.h" WRITE8_MEMBER(orbit_state::orbit_playfield_w) { m_playfield_ram[offset] = data; m_bg_tilemap->mark_tile_dirty(offset); } TILE_GET_INFO_MEMBER(orbit_state::get_tile_info) { uint8_t code = m_playfield_ram[tile_index]; int flags = 0; if (BIT(code, 6)) flags |= TILE_FLIPX; if (m_flip_screen) flags |= TILE_FLIPY; SET_TILE_INFO_MEMBER(3, code & 0x3f, 0, flags); } void orbit_state::video_start() { m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(orbit_state::get_tile_info),this), TILEMAP_SCAN_ROWS, 16, 16, 32, 30); } void orbit_state::draw_sprites( bitmap_ind16 &bitmap, const rectangle &cliprect ) { const uint8_t* p = m_sprite_ram; int i; for (i = 0; i < 16; i++) { int code = *p++; int vpos = *p++; int hpos = *p++; int flag = *p++; int layout = ((flag & 0xc0) == 0x80) ? 1 : ((flag & 0xc0) == 0xc0) ? 2 : 0; int flip_x = BIT(code, 6); int flip_y = BIT(code, 7); int zoom_x = 0x10000; int zoom_y = 0x10000; code &= 0x3f; if (flag & 1) code |= 0x40; if (flag & 2) zoom_x *= 2; vpos = 240 - vpos; hpos <<= 1; vpos <<= 1; m_gfxdecode->gfx(layout)->zoom_transpen(bitmap,cliprect, code, 0, flip_x, flip_y, hpos, vpos, zoom_x, zoom_y, 0); } } uint32_t orbit_state::screen_update_orbit(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) { m_flip_screen = ioport("DSW2")->read() & 8; m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0); draw_sprites(bitmap, cliprect); return 0; }