// license:BSD-3-Clause // copyright-holders:David Haywood, Pierpaolo Prazzoli #include "emu.h" #include "includes/scotrsht.h" // Similar as Iron Horse void scotrsht_state::scotrsht_palette(palette_device &palette) const { const uint8_t *color_prom = memregion("proms")->base(); // create a lookup table for the palette for (int i = 0; i < 0x100; i++) { int const r = pal4bit(color_prom[i | 0x000]); int const g = pal4bit(color_prom[i | 0x100]); int const b = pal4bit(color_prom[i | 0x200]); palette.set_indirect_color(i, rgb_t(r, g, b)); } // color_prom now points to the beginning of the lookup table color_prom += 0x300; // characters use colors 0x80-0xff, sprites use colors 0-0x7f for (int i = 0; i < 0x200; i++) { for (int j = 0; j < 8; j++) { uint8_t const ctabentry = ((~i & 0x100) >> 1) | (j << 4) | (color_prom[i] & 0x0f); palette.set_pen_indirect(((i & 0x100) << 3) | (j << 8) | (i & 0xff), ctabentry); } } } WRITE8_MEMBER(scotrsht_state::videoram_w) { m_videoram[offset] = data; m_bg_tilemap->mark_tile_dirty(offset); } WRITE8_MEMBER(scotrsht_state::colorram_w) { m_colorram[offset] = data; m_bg_tilemap->mark_tile_dirty(offset); } WRITE8_MEMBER(scotrsht_state::charbank_w) { if (m_charbank != (data & 0x01)) { m_charbank = data & 0x01; m_bg_tilemap->mark_all_dirty(); } // other bits unknown } WRITE8_MEMBER(scotrsht_state::palettebank_w) { if (m_palette_bank != ((data & 0x70) >> 4)) { m_palette_bank = ((data & 0x70) >> 4); m_bg_tilemap->mark_all_dirty(); } machine().bookkeeping().coin_counter_w(0, data & 1); machine().bookkeeping().coin_counter_w(1, data & 2); // data & 4 unknown } TILE_GET_INFO_MEMBER(scotrsht_state::get_bg_tile_info) { int attr = m_colorram[tile_index]; int code = m_videoram[tile_index] + (m_charbank << 9) + ((attr & 0x40) << 2); int color = (attr & 0x0f) + m_palette_bank * 16; int flag = 0; if(attr & 0x10) flag |= TILE_FLIPX; if(attr & 0x20) flag |= TILE_FLIPY; // data & 0x80 -> tile priority? SET_TILE_INFO_MEMBER(0, code, color, flag); } /* Same as Jailbreak + palette bank */ void scotrsht_state::draw_sprites(bitmap_ind16 &bitmap, const rectangle &cliprect ) { for (int i = 0; i < m_spriteram.bytes(); i += 4) { int attr = m_spriteram[i + 1]; // attributes = ?tyxcccc int code = m_spriteram[i] + ((attr & 0x40) << 2); int color = (attr & 0x0f) + m_palette_bank * 16; int flipx = attr & 0x10; int flipy = attr & 0x20; int sx = m_spriteram[i + 2] - ((attr & 0x80) << 1); int sy = m_spriteram[i + 3]; if (flip_screen()) { sx = 240 - sx; sy = 240 - sy; flipx = !flipx; flipy = !flipy; } m_gfxdecode->gfx(1)->transmask(bitmap,cliprect, code, color, flipx, flipy, sx, sy, m_palette->transpen_mask(*m_gfxdecode->gfx(1), color, m_palette_bank * 16)); } } void scotrsht_state::video_start() { m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(scotrsht_state::get_bg_tile_info)), TILEMAP_SCAN_ROWS, 8, 8, 64, 32); m_bg_tilemap->set_scroll_cols(64); save_item(NAME(m_irq_enable)); save_item(NAME(m_charbank)); save_item(NAME(m_palette_bank)); } uint32_t scotrsht_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) { for (int col = 0; col < 32; col++) m_bg_tilemap->set_scrolly(col, m_scroll[col]); m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0); draw_sprites(bitmap, cliprect); return 0; }