/*************************************************************************** Atari Orbit video emulation ***************************************************************************/ #include "emu.h" #include "includes/orbit.h" WRITE8_HANDLER( orbit_playfield_w ) { orbit_state *state = space->machine().driver_data(); state->m_playfield_ram[offset] = data; tilemap_mark_tile_dirty(state->m_bg_tilemap, offset); } static TILE_GET_INFO( get_tile_info ) { orbit_state *state = machine.driver_data(); UINT8 code = state->m_playfield_ram[tile_index]; int flags = 0; if (BIT(code, 6)) flags |= TILE_FLIPX; if (state->m_flip_screen) flags |= TILE_FLIPY; SET_TILE_INFO(3, code & 0x3f, 0, flags); } VIDEO_START( orbit ) { orbit_state *state = machine.driver_data(); state->m_bg_tilemap = tilemap_create(machine, get_tile_info, tilemap_scan_rows, 16, 16, 32, 30); } static void draw_sprites( running_machine &machine, bitmap_t* bitmap, const rectangle* cliprect ) { orbit_state *state = machine.driver_data(); const UINT8* p = state->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; drawgfxzoom_transpen(bitmap, cliprect, machine.gfx[layout], code, 0, flip_x, flip_y, hpos, vpos, zoom_x, zoom_y, 0); } } SCREEN_UPDATE( orbit ) { orbit_state *state = screen->machine().driver_data(); state->m_flip_screen = input_port_read(screen->machine(), "DSW2") & 8; tilemap_draw(bitmap, cliprect, state->m_bg_tilemap, 0, 0); draw_sprites(screen->machine(), bitmap, cliprect); return 0; }