/*************************************************************************** Target Hits Video Hardware Functions to emulate the video hardware of the machine ***************************************************************************/ #include "emu.h" #include "includes/targeth.h" /*************************************************************************** Callbacks for the TileMap code ***************************************************************************/ /* Tile format ----------- Screen 0 & 1: (64*32, 16x16 tiles) Word | Bit(s) | Description -----+-FEDCBA98-76543210-+-------------------------- 0 | --xxxxxx xxxxxxxx | code 0 | xx------ -------- | not used? 1 | -------- ---xxxxx | color (uses 1st half of the palette) 1 | -------- --x----- | flip y 1 | -------- -x------ | flip x 1 | xxxxxxxx x------- | not used? */ static TILE_GET_INFO( get_tile_info_targeth_screen0 ) { targeth_state *state = machine.driver_data(); int data = state->m_videoram[tile_index << 1]; int data2 = state->m_videoram[(tile_index << 1) + 1]; int code = data & 0x3fff; SET_TILE_INFO(0, code, data2 & 0x1f, TILE_FLIPXY((data2 >> 5) & 0x03)); } static TILE_GET_INFO( get_tile_info_targeth_screen1 ) { targeth_state *state = machine.driver_data(); int data = state->m_videoram[(0x2000/2) + (tile_index << 1)]; int data2 = state->m_videoram[(0x2000/2) + (tile_index << 1) + 1]; int code = data & 0x3fff; SET_TILE_INFO(0, code, data2 & 0x1f, TILE_FLIPXY((data2 >> 5) & 0x03)); } /*************************************************************************** Memory Handlers ***************************************************************************/ WRITE16_HANDLER( targeth_vram_w ) { targeth_state *state = space->machine().driver_data(); state->m_videoram[offset] = data; tilemap_mark_tile_dirty(state->m_pant[(offset & 0x1fff) >> 12], ((offset << 1) & 0x1fff) >> 2); } /*************************************************************************** Start/Stop the video hardware emulation. ***************************************************************************/ VIDEO_START( targeth ) { targeth_state *state = machine.driver_data(); state->m_pant[0] = tilemap_create(machine, get_tile_info_targeth_screen0,tilemap_scan_rows,16,16,64,32); state->m_pant[1] = tilemap_create(machine, get_tile_info_targeth_screen1,tilemap_scan_rows,16,16,64,32); tilemap_set_transparent_pen(state->m_pant[0],0); } /*************************************************************************** Sprites ***************************************************************************/ /* Sprite Format ------------- Word | Bit(s) | Description -----+-FEDCBA98-76543210-+-------------------------- 0 | -------- xxxxxxxx | y position 0 | --xxxxxx -------- | not used? 0 | -x------ -------- | flipx 0 | x------- -------- | flipy 1 | xxxxxxxx xxxxxxxx | not used? 2 | ------xx xxxxxxxx | x position 2 | -xxxxx-- -------- | sprite color (uses 2nd half of the palette) 3 | --xxxxxx xxxxxxxx | sprite code 3 | xx------ -------- | not used? */ static void draw_sprites(running_machine &machine, bitmap_t *bitmap, const rectangle *cliprect) { targeth_state *state = machine.driver_data(); int i; const gfx_element *gfx = machine.gfx[0]; for (i = 3; i < (0x1000 - 6)/2; i += 4){ int sx = state->m_spriteram[i+2] & 0x03ff; int sy = (240 - (state->m_spriteram[i] & 0x00ff)) & 0x00ff; int number = state->m_spriteram[i+3] & 0x3fff; int color = (state->m_spriteram[i+2] & 0x7c00) >> 10; int attr = (state->m_spriteram[i] & 0xfe00) >> 9; int xflip = attr & 0x20; int yflip = attr & 0x40; drawgfx_transpen(bitmap,cliprect,gfx,number, 0x20 + color,xflip,yflip, sx - 0x0f,sy,0); } } /*************************************************************************** Display Refresh ***************************************************************************/ SCREEN_UPDATE( targeth ) { targeth_state *state = screen->machine().driver_data(); /* set scroll registers */ tilemap_set_scrolly(state->m_pant[0], 0, state->m_vregs[0]); tilemap_set_scrollx(state->m_pant[0], 0, state->m_vregs[1] + 0x04); tilemap_set_scrolly(state->m_pant[1], 0, state->m_vregs[2]); tilemap_set_scrollx(state->m_pant[1], 0, state->m_vregs[3]); tilemap_draw(bitmap,cliprect,state->m_pant[1],0,0); tilemap_draw(bitmap,cliprect,state->m_pant[0],0,0); draw_sprites(screen->machine(), bitmap,cliprect); return 0; }