// license:BSD-3-Clause // copyright-holders: Roberto Fresca, Grull Osgo /*********************************************** .-----------------------------------------. | | | CAL OMEGA / CEI / UCMC | | SYSTEMS 903 / 904 / 905 / 906-III | | | | Driver by Roberto Fresca & Grull Osgo | | | '-----------------------------------------' * Video Hardware * ************************************************/ #include "emu.h" #include "includes/calomega.h" void calomega_state::calomega_videoram_w(offs_t offset, uint8_t data) { m_videoram[offset] = data; m_bg_tilemap->mark_tile_dirty(offset); } void calomega_state::calomega_colorram_w(offs_t offset, uint8_t data) { m_colorram[offset] = data; m_bg_tilemap->mark_tile_dirty(offset); } TILE_GET_INFO_MEMBER(calomega_state::get_bg_tile_info) { /* - bits - 7654 3210 --xx xx-- tiles color. ---- --x- tiles bank. x--- ---x extended tiles addressing. -x-- ---- seems unused. */ int attr = m_colorram[tile_index]; int code = ((attr & 1) << 8) | m_videoram[tile_index]; // bit 0 extends the the tiles addressing. int bank = (attr & 0x02) >> 1; // bit 1 switch the gfx banks. int color = (attr & 0x3c) >> 2; // bits 2-3-4-5 for color. tileinfo.set(bank, code, color, 0); } void calomega_state::video_start() { m_gfxdecode->gfx(0)->set_granularity(8); m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(calomega_state::get_bg_tile_info)), TILEMAP_SCAN_ROWS, 8, 8, 32, 31); } uint32_t calomega_state::screen_update_calomega(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect) { if(r_pot != m_red->read()) { r_pot = m_red->read() * 2.55; calomega_palette(*m_palette);} if(g_pot != m_grn->read()) { g_pot = m_grn->read() * 2.55; calomega_palette(*m_palette);} if(b_pot != m_blu->read()) { b_pot = m_blu->read() * 2.55; calomega_palette(*m_palette);} m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0); return 0; } void calomega_state::calomega_palette(palette_device &palette) const { /* The proms are 256 x 4 bits, but the games only seem to need the first 128 entries, and the rest of the PROM data looks like junk rather than valid colors prom bits 3210 ---x red component --x- green component -x-- blue component x--- foreground (colors with this bit set are full brightness, colors with it clear are attenuated by the analogic color pots) */ uint8_t const *const color_prom = memregion("proms")->base(); if (!color_prom) return; for (int i = 0; i < palette.entries(); i++) { int const nibble = color_prom[i]; int const fg = BIT(nibble, 3); // red component int const r = BIT(nibble, 0) * (fg ? 0xff : r_pot); // green component int const g = BIT(nibble, 1) * (fg ? 0xff : g_pot); // blue component int const b = BIT(nibble, 2) * (fg ? 0xff : b_pot); palette.set_pen_color(i, rgb_t(r, g, b)); } }