// license:BSD-3-Clause // copyright-holders:Ernesto Corvi /****************************************************************************** Data East Side Pocket hardware Functions to emulate the video hardware ******************************************************************************/ #include "emu.h" #include "includes/sidepckt.h" void sidepckt_state::sidepckt_palette(palette_device &palette) const { uint8_t const *const color_prom = memregion("proms")->base(); for (int i = 0; i < palette.entries(); i++) { int bit0, bit1, bit2, bit3; // red component bit0 = BIT(color_prom[i], 4); bit1 = BIT(color_prom[i], 5); bit2 = BIT(color_prom[i], 6); bit3 = BIT(color_prom[i], 7); int const r = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3; // green component bit0 = BIT(color_prom[i], 0); bit1 = BIT(color_prom[i], 1); bit2 = BIT(color_prom[i], 2); bit3 = BIT(color_prom[i], 3); int const g = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3; // blue component bit0 = BIT(color_prom[i + palette.entries()], 0); bit1 = BIT(color_prom[i + palette.entries()], 1); bit2 = BIT(color_prom[i + palette.entries()], 2); bit3 = BIT(color_prom[i + palette.entries()], 3); int const b = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3; palette.set_pen_color(i, rgb_t(r, g, b)); } } /*************************************************************************** Callbacks for the TileMap code ***************************************************************************/ TILE_GET_INFO_MEMBER(sidepckt_state::get_tile_info) { uint8_t attr = m_colorram[tile_index]; SET_TILE_INFO_MEMBER(0, m_videoram[tile_index] + ((attr & 0x07) << 8), ((attr & 0x10) >> 3) | ((attr & 0x20) >> 5), TILE_FLIPX); tileinfo.group = (attr & 0x80) >> 7; } /*************************************************************************** Start the video hardware emulation. ***************************************************************************/ void sidepckt_state::video_start() { m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(sidepckt_state::get_tile_info)), TILEMAP_SCAN_ROWS, 8,8, 32,32); m_bg_tilemap->set_transmask(0,0xff,0x00); /* split type 0 is totally transparent in front half */ m_bg_tilemap->set_transmask(1,0x01,0xfe); /* split type 1 has pen 0 transparent in front half */ machine().tilemap().set_flip_all(TILEMAP_FLIPX); } /*************************************************************************** Memory handlers ***************************************************************************/ WRITE8_MEMBER(sidepckt_state::videoram_w) { m_videoram[offset] = data; m_bg_tilemap->mark_tile_dirty(offset); } WRITE8_MEMBER(sidepckt_state::colorram_w) { m_colorram[offset] = data; m_bg_tilemap->mark_tile_dirty(offset); } READ8_MEMBER(sidepckt_state::scroll_y_r) { return (m_scroll_y); } WRITE8_MEMBER(sidepckt_state::scroll_y_w) { // Bits 0-5: Scroll y m_scroll_y = data & 0x3F; // Other bits: Unknown, but they seem never written if (data > 0x3F) logerror ("scroll_y_w: Unknown write -> data = 0x%02X\n", data); } /*************************************************************************** Display refresh ***************************************************************************/ void sidepckt_state::draw_sprites(bitmap_ind16 &bitmap,const rectangle &cliprect) { for (int offs = 0;offs < m_spriteram.bytes(); offs += 4) { int attr = m_spriteram[offs | 1]; int code = ((attr & 0x03) << 8) | m_spriteram[offs | 3]; int color = (attr & 0xf0) >> 4; int sx = m_spriteram[offs | 2] - 2; int sy = m_spriteram[offs]; int flipx = attr & 0x08; int flipy = attr & 0x04; m_gfxdecode->gfx(1)->transpen(bitmap,cliprect, code, color, flipx,flipy, sx,sy,0); /* wraparound */ m_gfxdecode->gfx(1)->transpen(bitmap,cliprect, code, color, flipx,flipy, sx-256,sy,0); } } uint32_t sidepckt_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) { m_bg_tilemap->set_scrolly (0, m_scroll_y); m_bg_tilemap->draw(screen, bitmap, cliprect, TILEMAP_DRAW_LAYER1,0); draw_sprites(bitmap,cliprect); m_bg_tilemap->draw(screen, bitmap, cliprect, TILEMAP_DRAW_LAYER0,0); return 0; }