// license:BSD-3-Clause // copyright-holders:David Haywood // currently used by gstriker.cpp, apparently inufuku uses the same chip /*** VS920A (score tilemap) **********************************************/ /* VS920A - (Very) Simple tilemap chip ----------------------------------- - 1 Plane - Tiles 8x8, 4bpp - Map 64x64 - No scrolling or other effects (at least in gstriker) Videoram format: ---------------- pppp tttt tttt tttt t=tile, p=palette */ #include "emu.h" #include "vs920a.h" DEFINE_DEVICE_TYPE(VS920A, vs920a_text_tilemap_device, "vs920a", "VS920A Text Tilemap") vs920a_text_tilemap_device::vs920a_text_tilemap_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : device_t(mconfig, VS920A, tag, owner, clock) , m_tmap(nullptr) , m_vram() , m_pal_base(0) , m_gfx_region(0) , m_gfxdecode(*this, finder_base::DUMMY_TAG) { } void vs920a_text_tilemap_device::device_start() { if (!m_gfxdecode->started()) throw device_missing_dependencies(); m_vram = make_unique_clear(0x1000/2); save_pointer(NAME(m_vram), 0x1000/2); save_item(NAME(m_pal_base)); m_tmap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(vs920a_text_tilemap_device::get_tile_info)), TILEMAP_SCAN_ROWS, 8, 8, 64, 32); m_tmap->set_transparent_pen(0); } void vs920a_text_tilemap_device::device_reset() { } TILE_GET_INFO_MEMBER(vs920a_text_tilemap_device::get_tile_info) { int data; int tileno, pal; data = m_vram[tile_index]; tileno = data & 0xFFF; pal = (data >> 12) & 0xF; SET_TILE_INFO_MEMBER(m_gfx_region, tileno, m_pal_base + pal, 0); } WRITE16_MEMBER(vs920a_text_tilemap_device::vram_w) { COMBINE_DATA(&m_vram[offset]); m_tmap->mark_tile_dirty(offset); } READ16_MEMBER(vs920a_text_tilemap_device::vram_r) { return m_vram[offset]; } void vs920a_text_tilemap_device::draw(screen_device &screen, bitmap_ind16& bitmap, const rectangle &cliprect, int priority) { m_tmap->draw(screen, bitmap, cliprect, 0, priority); }