/*************************************************************************** video.c Functions to emulate the video hardware of the machine. ***************************************************************************/ #include "emu.h" #include "includes/lwings.h" /*************************************************************************** Callbacks for the TileMap code ***************************************************************************/ static TILEMAP_MAPPER( get_bg2_memory_offset ) { return (row * 0x800) | (col * 2); } static TILE_GET_INFO( get_fg_tile_info ) { lwings_state *state = machine.driver_data(); int code = state->m_fgvideoram[tile_index]; int color = state->m_fgvideoram[tile_index + 0x400]; SET_TILE_INFO( 0, code + ((color & 0xc0) << 2), color & 0x0f, TILE_FLIPYX((color & 0x30) >> 4)); } static TILE_GET_INFO( lwings_get_bg1_tile_info ) { lwings_state *state = machine.driver_data(); int code = state->m_bg1videoram[tile_index]; int color = state->m_bg1videoram[tile_index + 0x400]; SET_TILE_INFO( 1, code + ((color & 0xe0) << 3), color & 0x07, TILE_FLIPYX((color & 0x18) >> 3)); } static TILE_GET_INFO( trojan_get_bg1_tile_info ) { lwings_state *state = machine.driver_data(); int code = state->m_bg1videoram[tile_index]; int color = state->m_bg1videoram[tile_index + 0x400]; code += (color & 0xe0)<<3; SET_TILE_INFO( 1, code, state->m_bg2_avenger_hw ? ((color & 7) ^ 6) : (color & 7), ((color & 0x10) ? TILE_FLIPX : 0)); tileinfo->group = (color & 0x08) >> 3; } static TILE_GET_INFO( get_bg2_tile_info ) { lwings_state *state = machine.driver_data(); int code, color; UINT8 *rom = machine.region("gfx5")->base(); int mask = machine.region("gfx5")->bytes() - 1; tile_index = (tile_index + state->m_bg2_image * 0x20) & mask; code = rom[tile_index]; color = rom[tile_index + 1]; SET_TILE_INFO( 3, code + ((color & 0x80) << 1), color & 0x07, TILE_FLIPYX((color & 0x30) >> 4)); } /*************************************************************************** Start the video hardware emulation. ***************************************************************************/ VIDEO_START( lwings ) { lwings_state *state = machine.driver_data(); state->m_fg_tilemap = tilemap_create(machine, get_fg_tile_info, tilemap_scan_rows, 8, 8, 32, 32); state->m_bg1_tilemap = tilemap_create(machine, lwings_get_bg1_tile_info, tilemap_scan_cols, 16, 16, 32, 32); tilemap_set_transparent_pen(state->m_fg_tilemap, 3); } VIDEO_START( trojan ) { lwings_state *state = machine.driver_data(); state->m_fg_tilemap = tilemap_create(machine, get_fg_tile_info, tilemap_scan_rows, 8, 8, 32, 32); state->m_bg1_tilemap = tilemap_create(machine, trojan_get_bg1_tile_info,tilemap_scan_cols, 16, 16, 32, 32); state->m_bg2_tilemap = tilemap_create(machine, get_bg2_tile_info, get_bg2_memory_offset, 16, 16, 32, 16); tilemap_set_transparent_pen(state->m_fg_tilemap, 3); tilemap_set_transmask(state->m_bg1_tilemap, 0, 0xffff, 0x0001); /* split type 0 is totally transparent in front half */ tilemap_set_transmask(state->m_bg1_tilemap, 1, 0xf07f, 0x0f81); /* split type 1 has pens 7-11 opaque in front half */ state->m_bg2_avenger_hw = 0; } VIDEO_START( avengers ) { lwings_state *state = machine.driver_data(); VIDEO_START_CALL(trojan); state->m_bg2_avenger_hw = 1; } /*************************************************************************** Memory handlers ***************************************************************************/ WRITE8_HANDLER( lwings_fgvideoram_w ) { lwings_state *state = space->machine().driver_data(); state->m_fgvideoram[offset] = data; tilemap_mark_tile_dirty(state->m_fg_tilemap, offset & 0x3ff); } WRITE8_HANDLER( lwings_bg1videoram_w ) { lwings_state *state = space->machine().driver_data(); state->m_bg1videoram[offset] = data; tilemap_mark_tile_dirty(state->m_bg1_tilemap, offset & 0x3ff); } WRITE8_HANDLER( lwings_bg1_scrollx_w ) { lwings_state *state = space->machine().driver_data(); state->m_scroll_x[offset] = data; tilemap_set_scrollx(state->m_bg1_tilemap, 0, state->m_scroll_x[0] | (state->m_scroll_x[1] << 8)); } WRITE8_HANDLER( lwings_bg1_scrolly_w ) { lwings_state *state = space->machine().driver_data(); state->m_scroll_y[offset] = data; tilemap_set_scrolly(state->m_bg1_tilemap, 0, state->m_scroll_y[0] | (state->m_scroll_y[1] << 8)); } WRITE8_HANDLER( trojan_bg2_scrollx_w ) { lwings_state *state = space->machine().driver_data(); tilemap_set_scrollx(state->m_bg2_tilemap, 0, data); } WRITE8_HANDLER( trojan_bg2_image_w ) { lwings_state *state = space->machine().driver_data(); if (state->m_bg2_image != data) { state->m_bg2_image = data; tilemap_mark_all_tiles_dirty(state->m_bg2_tilemap); } } /*************************************************************************** Display refresh ***************************************************************************/ INLINE int is_sprite_on( UINT8 *buffered_spriteram, int offs ) { int sx, sy; sx = buffered_spriteram[offs + 3] - 0x100 * (buffered_spriteram[offs + 1] & 0x01); sy = buffered_spriteram[offs + 2]; return sx || sy; } static void lwings_draw_sprites( running_machine &machine, bitmap_t *bitmap, const rectangle *cliprect ) { UINT8 *buffered_spriteram = machine.generic.buffered_spriteram.u8; int offs; for (offs = machine.generic.spriteram_size - 4; offs >= 0; offs -= 4) { if (is_sprite_on(buffered_spriteram, offs)) { int code, color, sx, sy, flipx, flipy; sx = buffered_spriteram[offs + 3] - 0x100 * (buffered_spriteram[offs + 1] & 0x01); sy = buffered_spriteram[offs + 2]; if (sy > 0xf8) sy -= 0x100; code = buffered_spriteram[offs] | (buffered_spriteram[offs + 1] & 0xc0) << 2; color = (buffered_spriteram[offs + 1] & 0x38) >> 3; flipx = buffered_spriteram[offs + 1] & 0x02; flipy = buffered_spriteram[offs + 1] & 0x04; if (flip_screen_get(machine)) { sx = 240 - sx; sy = 240 - sy; flipx = !flipx; flipy = !flipy; } drawgfx_transpen(bitmap,cliprect,machine.gfx[2], code,color, flipx,flipy, sx,sy,15); } } } static void trojan_draw_sprites( running_machine &machine, bitmap_t *bitmap, const rectangle *cliprect ) { lwings_state *state = machine.driver_data(); UINT8 *buffered_spriteram = machine.generic.buffered_spriteram.u8; int offs; for (offs = machine.generic.spriteram_size - 4; offs >= 0; offs -= 4) { if (is_sprite_on(buffered_spriteram, offs)) { int code, color, sx, sy, flipx, flipy; sx = buffered_spriteram[offs + 3] - 0x100 * (buffered_spriteram[offs + 1] & 0x01); sy = buffered_spriteram[offs + 2]; if (sy > 0xf8) sy -= 0x100; code = buffered_spriteram[offs] | ((buffered_spriteram[offs + 1] & 0x20) << 4) | ((buffered_spriteram[offs + 1] & 0x40) << 2) | ((buffered_spriteram[offs + 1] & 0x80) << 3); color = (buffered_spriteram[offs + 1] & 0x0e) >> 1; if (state->m_bg2_avenger_hw) { flipx = 0; /* Avengers */ flipy = ~buffered_spriteram[offs + 1] & 0x10; } else { flipx = buffered_spriteram[offs + 1] & 0x10; /* Trojan */ flipy = 1; } if (flip_screen_get(machine)) { sx = 240 - sx; sy = 240 - sy; flipx = !flipx; flipy = !flipy; } drawgfx_transpen(bitmap,cliprect,machine.gfx[2], code,color, flipx,flipy, sx,sy,15); } } } SCREEN_UPDATE( lwings ) { lwings_state *state = screen->machine().driver_data(); tilemap_draw(bitmap, cliprect, state->m_bg1_tilemap, 0, 0); lwings_draw_sprites(screen->machine(), bitmap, cliprect); tilemap_draw(bitmap, cliprect, state->m_fg_tilemap, 0, 0); return 0; } SCREEN_UPDATE( trojan ) { lwings_state *state = screen->machine().driver_data(); tilemap_draw(bitmap, cliprect, state->m_bg2_tilemap, 0, 0); tilemap_draw(bitmap, cliprect, state->m_bg1_tilemap, TILEMAP_DRAW_LAYER1, 0); trojan_draw_sprites(screen->machine(), bitmap, cliprect); tilemap_draw(bitmap, cliprect, state->m_bg1_tilemap, TILEMAP_DRAW_LAYER0, 0); tilemap_draw(bitmap, cliprect, state->m_fg_tilemap, 0, 0); return 0; } SCREEN_EOF( lwings ) { address_space *space = machine.device("maincpu")->memory().space(AS_PROGRAM); buffer_spriteram_w(space, 0, 0); }