/*************************************************************************** video.c Functions to emulate the video hardware of the machine. ***************************************************************************/ #include "emu.h" #include "includes/pbaction.h" WRITE8_HANDLER( pbaction_videoram_w ) { pbaction_state *state = space->machine().driver_data(); state->m_videoram[offset] = data; tilemap_mark_tile_dirty(state->m_bg_tilemap, offset); } WRITE8_HANDLER( pbaction_colorram_w ) { pbaction_state *state = space->machine().driver_data(); state->m_colorram[offset] = data; tilemap_mark_tile_dirty(state->m_bg_tilemap, offset); } WRITE8_HANDLER( pbaction_videoram2_w ) { pbaction_state *state = space->machine().driver_data(); state->m_videoram2[offset] = data; tilemap_mark_tile_dirty(state->m_fg_tilemap, offset); } WRITE8_HANDLER( pbaction_colorram2_w ) { pbaction_state *state = space->machine().driver_data(); state->m_colorram2[offset] = data; tilemap_mark_tile_dirty(state->m_fg_tilemap, offset); } WRITE8_HANDLER( pbaction_scroll_w ) { pbaction_state *state = space->machine().driver_data(); state->m_scroll = data - 3; if (flip_screen_get(space->machine())) state->m_scroll = -state->m_scroll; tilemap_set_scrollx(state->m_bg_tilemap, 0, state->m_scroll); tilemap_set_scrollx(state->m_fg_tilemap, 0, state->m_scroll); } WRITE8_HANDLER( pbaction_flipscreen_w ) { flip_screen_set(space->machine(), data & 0x01); } static TILE_GET_INFO( get_bg_tile_info ) { pbaction_state *state = machine.driver_data(); int attr = state->m_colorram[tile_index]; int code = state->m_videoram[tile_index] + 0x10 * (attr & 0x70); int color = attr & 0x07; int flags = (attr & 0x80) ? TILE_FLIPY : 0; SET_TILE_INFO(1, code, color, flags); } static TILE_GET_INFO( get_fg_tile_info ) { pbaction_state *state = machine.driver_data(); int attr = state->m_colorram2[tile_index]; int code = state->m_videoram2[tile_index] + 0x10 * (attr & 0x30); int color = attr & 0x0f; int flags = ((attr & 0x40) ? TILE_FLIPX : 0) | ((attr & 0x80) ? TILE_FLIPY : 0); SET_TILE_INFO(0, code, color, flags); } VIDEO_START( pbaction ) { pbaction_state *state = machine.driver_data(); state->m_bg_tilemap = tilemap_create(machine, get_bg_tile_info, tilemap_scan_rows, 8, 8, 32, 32); state->m_fg_tilemap = tilemap_create(machine, get_fg_tile_info, tilemap_scan_rows, 8, 8, 32, 32); tilemap_set_transparent_pen(state->m_fg_tilemap, 0); } static void draw_sprites( running_machine &machine, bitmap_t *bitmap, const rectangle *cliprect ) { pbaction_state *state = machine.driver_data(); UINT8 *spriteram = state->m_spriteram; int offs; for (offs = state->m_spriteram_size - 4; offs >= 0; offs -= 4) { int sx, sy, flipx, flipy; /* if next sprite is double size, skip this one */ if (offs > 0 && spriteram[offs - 4] & 0x80) continue; sx = spriteram[offs + 3]; if (spriteram[offs] & 0x80) sy = 225 - spriteram[offs + 2]; else sy = 241 - spriteram[offs + 2]; flipx = spriteram[offs + 1] & 0x40; flipy = spriteram[offs + 1] & 0x80; if (flip_screen_get(machine)) { if (spriteram[offs] & 0x80) { sx = 224 - sx; sy = 225 - sy; } else { sx = 240 - sx; sy = 241 - sy; } flipx = !flipx; flipy = !flipy; } drawgfx_transpen(bitmap,cliprect,machine.gfx[(spriteram[offs] & 0x80) ? 3 : 2], /* normal or double size */ spriteram[offs], spriteram[offs + 1] & 0x0f, flipx,flipy, sx + (flip_screen_get(machine) ? state->m_scroll : -state->m_scroll), sy,0); } } SCREEN_UPDATE( pbaction ) { pbaction_state *state = screen->machine().driver_data(); tilemap_draw(bitmap, cliprect, state->m_bg_tilemap, 0, 0); draw_sprites(screen->machine(), bitmap, cliprect); tilemap_draw(bitmap, cliprect, state->m_fg_tilemap, 0, 0); return 0; }