#include "driver.h" static int bg_index[4]; static tilemap *bg_tilemap, *fg_tilemap; WRITE8_HANDLER( exprraid_videoram_w ) { videoram[offset] = data; tilemap_mark_tile_dirty(fg_tilemap, offset); } WRITE8_HANDLER( exprraid_colorram_w ) { colorram[offset] = data; tilemap_mark_tile_dirty(fg_tilemap, offset); } WRITE8_HANDLER( exprraid_flipscreen_w ) { if (flip_screen != (data & 0x01)) { flip_screen_set(data & 0x01); tilemap_mark_all_tiles_dirty(ALL_TILEMAPS); } } WRITE8_HANDLER( exprraid_bgselect_w ) { if (bg_index[offset] != data) { bg_index[offset] = data; tilemap_mark_all_tiles_dirty(bg_tilemap); } } WRITE8_HANDLER( exprraid_scrollx_w ) { tilemap_set_scrollx(bg_tilemap, offset, data); } WRITE8_HANDLER( exprraid_scrolly_w ) { tilemap_set_scrolly(bg_tilemap, 0, data); } static TILE_GET_INFO( get_bg_tile_info ) { UINT8 *tilerom = memory_region(REGION_GFX4); int data, attr, bank, code, color, flags; int quadrant = 0, offs; int sx = tile_index % 32; int sy = tile_index / 32; if (sx >= 16) quadrant++; if (sy >= 16) quadrant += 2; offs = (sy % 16) * 16 + (sx % 16) + (bg_index[quadrant] & 0x3f) * 0x100; data = tilerom[offs]; attr = tilerom[offs + 0x4000]; bank = (2 * (attr & 0x03) + ((data & 0x80) >> 7)) + 2; code = data & 0x7f; color = (attr & 0x18) >> 3; flags = (attr & 0x04) ? TILE_FLIPX : 0; tileinfo->category = ((attr & 0x80) ? 1 : 0); SET_TILE_INFO(bank, code, color, flags); } static TILE_GET_INFO( get_fg_tile_info ) { int attr = colorram[tile_index]; int code = videoram[tile_index] + ((attr & 0x07) << 8); int color = (attr & 0x10) >> 4; SET_TILE_INFO(0, code, color, 0); } VIDEO_START( exprraid ) { bg_tilemap = tilemap_create(get_bg_tile_info, tilemap_scan_rows, TILEMAP_TYPE_PEN, 16, 16, 32, 32); fg_tilemap = tilemap_create(get_fg_tile_info, tilemap_scan_rows, TILEMAP_TYPE_PEN, 8, 8, 32, 32); tilemap_set_scroll_rows(bg_tilemap, 2); tilemap_set_transparent_pen(fg_tilemap, 0); } static void draw_sprites(running_machine *machine, mame_bitmap *bitmap, const rectangle *cliprect) { int offs; for (offs = 0;offs < spriteram_size;offs += 4) { int attr = spriteram[offs + 1]; int code = spriteram[offs + 3] + ((attr & 0xe0) << 3); int color = (attr & 0x03) + ((attr & 0x08) >> 1); int flipx = (attr & 0x04); int flipy = 0; int sx = ((248 - spriteram[offs + 2]) & 0xff) - 8; int sy = spriteram[offs]; if (flip_screen) { sx = 240 - sx; sy = 240 - sy; flipx = !flipx; flipy = !flipy; } drawgfx(bitmap, machine->gfx[1], code, color, flipx, flipy, sx, sy, 0, TRANSPARENCY_PEN, 0); /* double height */ if (attr & 0x10) { drawgfx(bitmap,machine->gfx[1], code + 1, color, flipx, flipy, sx, sy + (flip_screen ? -16 : 16), cliprect, TRANSPARENCY_PEN, 0); } } } VIDEO_UPDATE( exprraid ) { tilemap_draw(bitmap, cliprect, bg_tilemap, 0, 0); draw_sprites(machine, bitmap, cliprect); tilemap_draw(bitmap, cliprect, bg_tilemap, 1, 0); tilemap_draw(bitmap, cliprect, fg_tilemap, 0, 0); return 0; }