// license:BSD-3-Clause // copyright-holders:Ernesto Corvi /*************************************************************************** Knuckle Joe ***************************************************************************/ #include "emu.h" #include "includes/kncljoe.h" /*************************************************************************** Convert the color PROMs into a more useable format. ***************************************************************************/ void kncljoe_state::kncljoe_palette(palette_device &palette) const { uint8_t const *color_prom = memregion("proms")->base(); // create a lookup table for the palette for (int i = 0; i < 0x80; 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)); } for (int i = 0; i < 0x10; i++) { int bit0, bit1, bit2; // red component bit0 = 0; bit1 = BIT(color_prom[i + 0x300], 6); bit2 = BIT(color_prom[i + 0x300], 7); int const r = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2; // green component bit0 = BIT(color_prom[i + 0x300], 3); bit1 = BIT(color_prom[i + 0x300], 4); bit2 = BIT(color_prom[i + 0x300], 5); int const g = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2; // blue component bit0 = BIT(color_prom[i + 0x300], 0); bit1 = BIT(color_prom[i + 0x300], 1); bit2 = BIT(color_prom[i + 0x300], 2); int const b = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2; palette.set_indirect_color(i + 0x80, rgb_t(r, g, b)); } // color_prom now points to the beginning of the lookup table color_prom += 0x320; // chars for (int i = 0; i < 0x80; i++) palette.set_pen_indirect(i, i); // sprite lookup table for (int i = 0; i < 0x80; i++) { uint8_t const ctabentry = (color_prom[i] & 0x0f) | 0x80; palette.set_pen_indirect(i + 0x80, ctabentry); } } /*************************************************************************** Callbacks for the TileMap code ***************************************************************************/ TILE_GET_INFO_MEMBER(kncljoe_state::get_bg_tile_info) { int attr = m_videoram[2 * tile_index + 1]; int code = m_videoram[2 * tile_index] + ((attr & 0xc0) << 2) + (m_tile_bank << 10); tileinfo.set(0, code, attr & 0xf, TILE_FLIPXY((attr & 0x30) >> 4)); } /*************************************************************************** Start the video hardware emulation. ***************************************************************************/ void kncljoe_state::video_start() { m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(kncljoe_state::get_bg_tile_info)), TILEMAP_SCAN_ROWS, 8, 8, 64, 32); m_bg_tilemap->set_scroll_rows(4); } /*************************************************************************** Memory handlers ***************************************************************************/ void kncljoe_state::kncljoe_videoram_w(offs_t offset, uint8_t data) { m_videoram[offset] = data; m_bg_tilemap->mark_tile_dirty(offset / 2); } void kncljoe_state::kncljoe_control_w(uint8_t data) { /* 0x01 screen flip 0x02 coin counter#1 0x04 sprite bank 0x10 character bank 0x20 coin counter#2 reset when IN0 - Coin 1 goes low (active) set after IN0 - Coin 1 goes high AND the credit has been added */ m_flipscreen = data & 0x01; machine().tilemap().set_flip_all(m_flipscreen ? TILEMAP_FLIPX : TILEMAP_FLIPY); machine().bookkeeping().coin_counter_w(0, data & 0x02); machine().bookkeeping().coin_counter_w(1, data & 0x20); if (m_tile_bank != BIT(data, 4)) { m_tile_bank = BIT(data, 4); m_bg_tilemap->mark_all_dirty(); } m_sprite_bank = BIT(data, 2); } void kncljoe_state::kncljoe_scroll_w(offs_t offset, uint8_t data) { m_scrollregs[offset] = data; int scrollx = m_scrollregs[0] | m_scrollregs[1] << 8; m_bg_tilemap->set_scrollx(0, scrollx); m_bg_tilemap->set_scrollx(1, scrollx); m_bg_tilemap->set_scrollx(2, scrollx); m_bg_tilemap->set_scrollx(3, 0); } /*************************************************************************** Display refresh ***************************************************************************/ void kncljoe_state::draw_sprites( bitmap_ind16 &bitmap, const rectangle &cliprect ) { gfx_element *gfx = m_gfxdecode->gfx(1 + m_sprite_bank); for (int i = 0; i < 4; i++) { // clip vertical strip for each layer rectangle clip = cliprect; clip.min_y = m_flipscreen ? (191 - i * 64) : (i * 64 + 1); clip.max_y = clip.min_y + 63; clip &= cliprect; for (int j = 0x7c; j >= 0; j -= 4) { int offs = bitswap<2>(~i, 0, 1) << 7 | j; int sy = m_spriteram[offs] + 1; int sx = m_spriteram[offs + 3]; int attr = m_spriteram[offs + 1]; int code = m_spriteram[offs + 2] | ((attr & 0x10) << 5) | ((attr & 0x20) << 3); int flipx = attr & 0x40; int flipy = !(attr & 0x80); int color = attr & 0x0f; if (m_flipscreen) { flipx = !flipx; flipy = !flipy; sx = 240 - sx; sy = 240 - sy; } if (sx >= 256-8) sx -= 256; gfx->transpen(bitmap,clip, code, color, flipx,flipy, sx,sy,0); } } } uint32_t kncljoe_state::screen_update_kncljoe(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) { m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0); draw_sprites(bitmap, cliprect); return 0; }