// license:BSD-3-Clause // copyright-holders:David Haywood #include "emu.h" #include "includes/welltris.h" #include "screen.h" void welltris_state::setbank(int num, int bank) { if (m_gfxbank[num] != bank) { m_gfxbank[num] = bank; m_char_tilemap->mark_all_dirty(); } } /* Not really enough evidence here */ WRITE16_MEMBER(welltris_state::palette_bank_w) { if (ACCESSING_BITS_0_7) { if (m_charpalettebank != (data & 0x03)) { m_charpalettebank = (data & 0x03); m_char_tilemap->mark_all_dirty(); } flip_screen_set(data & 0x80); m_spritepalettebank = (data & 0x20) >> 5; m_pixelpalettebank = (data & 0x08) >> 3; } } WRITE16_MEMBER(welltris_state::gfxbank_w) { if (ACCESSING_BITS_0_7) { setbank(0, (data & 0xf0) >> 4); setbank(1, data & 0x0f); } } WRITE16_MEMBER(welltris_state::scrollreg_w) { switch (offset) { case 0: m_scrollx = data - 14; break; case 1: m_scrolly = data + 0; break; } } TILE_GET_INFO_MEMBER(welltris_state::get_tile_info) { uint16_t code = m_charvideoram[tile_index]; int bank = (code & 0x1000) >> 12; SET_TILE_INFO_MEMBER(0, (code & 0x0fff) + (m_gfxbank[bank] << 12), ((code & 0xe000) >> 13) + (8 * m_charpalettebank), 0); } WRITE16_MEMBER(welltris_state::charvideoram_w) { COMBINE_DATA(&m_charvideoram[offset]); m_char_tilemap->mark_tile_dirty(offset); } void welltris_state::video_start() { m_char_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(welltris_state::get_tile_info)), TILEMAP_SCAN_ROWS, 8, 8, 64, 32); m_char_tilemap->set_transparent_pen(15); save_item(NAME(m_gfxbank)); save_item(NAME(m_charpalettebank)); save_item(NAME(m_spritepalettebank)); save_item(NAME(m_pixelpalettebank)); save_item(NAME(m_scrollx)); save_item(NAME(m_scrolly)); } void welltris_state::draw_background(bitmap_ind16 &bitmap, const rectangle &cliprect) { int x, y; int pixdata; for (y = 0; y < 256; y++) { for (x = 0; x < 512 / 2; x++) { pixdata = m_pixelram[(x & 0xff) + (y & 0xff) * 256]; bitmap.pix16(y, (x * 2) + 0) = (pixdata >> 8) + (0x100 * m_pixelpalettebank) + 0x400; bitmap.pix16(y, (x * 2) + 1) = (pixdata & 0xff) + (0x100 * m_pixelpalettebank) + 0x400; } } } uint32_t welltris_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) { m_char_tilemap->set_scrollx(0, m_scrollx); m_char_tilemap->set_scrolly(0, m_scrolly); draw_background(bitmap, cliprect); m_char_tilemap->draw(screen, bitmap, cliprect, 0, 0); m_spr_old->turbofrc_draw_sprites(m_spriteram, m_spriteram.bytes(), m_spritepalettebank, bitmap, cliprect, screen.priority(), 0); return 0; }