// license:BSD-3-Clause // copyright-holders:Pierpaolo Prazzoli, David Haywood /* Cross Pang video hardware emulation -- this seems to be the same as the tumblepop bootleg based hardware in tumbleb.cpp */ #include "emu.h" #include "includes/crospang.h" void crospang_state::tilebank_select_w(u16 data) { logerror("tilebank_select_w %04x\n", data); m_tilebankselect = (data >> 8) & 3; } void crospang_state::tilebank_data_w(u16 data) { logerror("tilebank_data_w %04x\n", data); m_tilebank[m_tilebankselect] = data >> 8; m_fg_layer->mark_all_dirty(); m_bg_layer->mark_all_dirty(); } // Bestri performs some unusual operations on the scroll values before writing them void crospang_state::bestri_bg_scrolly_w(u16 data) { // addi.w #$1f8, D0 // eori.w #$154, D0 int scroll = (data & 0x3ff) ^ 0x0155; m_bg_layer->set_scrolly(0, -scroll + 7); } void crospang_state::bestri_fg_scrolly_w(u16 data) { // addi.w #$1f8, D0 // eori.w #$aa, D0 int scroll = (data & 0x3ff) ^ 0x00ab; m_fg_layer->set_scrolly(0, -scroll + 7); } void crospang_state::bestri_fg_scrollx_w(u16 data) { // addi.w #$400, D1 // eori.w #$1e0, D1 int scroll = (data & 0x3ff) ^ 0x1e1; m_fg_layer->set_scrollx(0, scroll - 1); } void crospang_state::bestri_bg_scrollx_w(u16 data) { // addi.w #$3fc, D1 // eori.w #$3c0, D1 int scroll = (data & 0x3ff) ^ 0x3c1; m_bg_layer->set_scrollx(0, scroll + 3); } void crospang_state::fg_scrolly_w(u16 data) { m_fg_layer->set_scrolly(0, data + 8); } void crospang_state::bg_scrolly_w(u16 data) { m_bg_layer->set_scrolly(0, data + 8); } void crospang_state::fg_scrollx_w(u16 data) { m_fg_layer->set_scrollx(0, data); } void crospang_state::bg_scrollx_w(u16 data) { m_bg_layer->set_scrollx(0, data + 4); } void crospang_state::fg_videoram_w(offs_t offset, u16 data, u16 mem_mask) { COMBINE_DATA(&m_fg_videoram[offset]); m_fg_layer->mark_tile_dirty(offset); } void crospang_state::bg_videoram_w(offs_t offset, u16 data, u16 mem_mask) { COMBINE_DATA(&m_bg_videoram[offset]); m_bg_layer->mark_tile_dirty(offset); } TILE_GET_INFO_MEMBER(crospang_state::get_bg_tile_info) { int data = m_bg_videoram[tile_index]; int tile = data & 0x03ff; int tilebank = (data & 0x0c00) >> 10; tile = tile + (m_tilebank[tilebank] << 10); int color = (data >> 12) & 0x0f; SET_TILE_INFO_MEMBER(1, tile, color + 0x20, 0); } TILE_GET_INFO_MEMBER(crospang_state::get_fg_tile_info) { int data = m_fg_videoram[tile_index]; int tile = data & 0x03ff; int tilebank = (data & 0x0c00) >> 10; tile = tile + (m_tilebank[tilebank] << 10); int color = (data >> 12) & 0x0f; SET_TILE_INFO_MEMBER(1, tile, color + 0x10, 0); } void crospang_state::video_start() { m_bg_layer = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(crospang_state::get_bg_tile_info)), TILEMAP_SCAN_ROWS, 16, 16, 32, 32); m_fg_layer = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(crospang_state::get_fg_tile_info)), TILEMAP_SCAN_ROWS, 16, 16, 32, 32); m_fg_layer->set_transparent_pen(0); } u32 crospang_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) { m_bg_layer->draw(screen, bitmap, cliprect, 0, 0); m_fg_layer->draw(screen, bitmap, cliprect, 0, 0); m_sprgen->draw_sprites(bitmap, cliprect, m_spriteram, 0x400); return 0; }