// license:BSD-3-Clause // copyright-holders:Mirko Buffoni /*************************************************************************** Capcom Vulgus hardware Functions to emulate the video hardware of the machine. ***************************************************************************/ #include "emu.h" #include "includes/vulgus.h" /*************************************************************************** Convert the color PROMs into a more useable format. ***************************************************************************/ void vulgus_state::vulgus_palette(palette_device &palette) const { const uint8_t *color_prom = memregion("proms")->base(); for (int i = 0; i < 256; i++) { int bit0,bit1,bit2,bit3; bit0 = (color_prom[0] >> 0) & 0x01; bit1 = (color_prom[0] >> 1) & 0x01; bit2 = (color_prom[0] >> 2) & 0x01; bit3 = (color_prom[0] >> 3) & 0x01; int const r = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3; bit0 = (color_prom[256] >> 0) & 0x01; bit1 = (color_prom[256] >> 1) & 0x01; bit2 = (color_prom[256] >> 2) & 0x01; bit3 = (color_prom[256] >> 3) & 0x01; int const g = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3; bit0 = (color_prom[2*256] >> 0) & 0x01; bit1 = (color_prom[2*256] >> 1) & 0x01; bit2 = (color_prom[2*256] >> 2) & 0x01; bit3 = (color_prom[2*256] >> 3) & 0x01; int const b = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3; palette.set_indirect_color(i, rgb_t(r, g, b)); color_prom++; } color_prom += 2*256; // color_prom now points to the beginning of the lookup table // characters use colors 32-47 (?) for (int i = 0; i < m_gfxdecode->gfx(0)->colors() * m_gfxdecode->gfx(0)->granularity(); i++) palette.set_pen_indirect(m_gfxdecode->gfx(0)->colorbase() + i, 32 + *color_prom++); // sprites use colors 16-31 for (int i = 0; i < m_gfxdecode->gfx(2)->colors() * m_gfxdecode->gfx(2)->granularity(); i++) palette.set_pen_indirect(m_gfxdecode->gfx(2)->colorbase() + i, 16 + *color_prom++); // background tiles use colors 0-15, 64-79, 128-143, 192-207 in four banks for (int i = 0; i < m_gfxdecode->gfx(1)->colors() * m_gfxdecode->gfx(1)->granularity() / 4; i++) { palette.set_pen_indirect(m_gfxdecode->gfx(1)->colorbase() + 0*32*8 + i, *color_prom); palette.set_pen_indirect(m_gfxdecode->gfx(1)->colorbase() + 1*32*8 + i, *color_prom + 64); palette.set_pen_indirect(m_gfxdecode->gfx(1)->colorbase() + 2*32*8 + i, *color_prom + 128); palette.set_pen_indirect(m_gfxdecode->gfx(1)->colorbase() + 3*32*8 + i, *color_prom + 192); color_prom++; } } /*************************************************************************** Callbacks for the TileMap code ***************************************************************************/ TILE_GET_INFO_MEMBER(vulgus_state::get_fg_tile_info) { int code, color; code = m_fgvideoram[tile_index]; color = m_fgvideoram[tile_index + 0x400]; SET_TILE_INFO_MEMBER(0, code + ((color & 0x80) << 1), color & 0x3f, 0); tileinfo.group = color & 0x3f; } TILE_GET_INFO_MEMBER(vulgus_state::get_bg_tile_info) { int code, color; code = m_bgvideoram[tile_index]; color = m_bgvideoram[tile_index + 0x400]; SET_TILE_INFO_MEMBER(1, code + ((color & 0x80) << 1), (color & 0x1f) + (0x20 * m_palette_bank), TILE_FLIPYX((color & 0x60) >> 5)); } /*************************************************************************** Start the video hardware emulation. ***************************************************************************/ void vulgus_state::video_start() { m_fg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(vulgus_state::get_fg_tile_info)), TILEMAP_SCAN_ROWS, 8, 8, 32,32); m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(vulgus_state::get_bg_tile_info)), TILEMAP_SCAN_COLS, 16,16, 32,32); m_fg_tilemap->configure_groups(*m_gfxdecode->gfx(0), 47); save_item(NAME(m_palette_bank)); } /*************************************************************************** Memory handlers ***************************************************************************/ WRITE8_MEMBER(vulgus_state::fgvideoram_w) { m_fgvideoram[offset] = data; m_fg_tilemap->mark_tile_dirty(offset & 0x3ff); } WRITE8_MEMBER(vulgus_state::bgvideoram_w) { m_bgvideoram[offset] = data; m_bg_tilemap->mark_tile_dirty(offset & 0x3ff); } WRITE8_MEMBER(vulgus_state::c804_w) { /* bits 0 and 1 are coin counters */ machine().bookkeeping().coin_counter_w(0, data & 0x01); machine().bookkeeping().coin_counter_w(1, data & 0x02); /* bit 7 flips screen */ flip_screen_set(data & 0x80); } WRITE8_MEMBER(vulgus_state::palette_bank_w) { if (m_palette_bank != (data & 3)) { m_palette_bank = data & 3; m_bg_tilemap->mark_all_dirty(); } } /*************************************************************************** Display refresh ***************************************************************************/ void vulgus_state::draw_sprites(bitmap_ind16 &bitmap, const rectangle &cliprect) { gfx_element *gfx = m_gfxdecode->gfx(2); for (int offs = m_spriteram.bytes() - 4; offs >= 0; offs -= 4) { int code = m_spriteram[offs]; int color = m_spriteram[offs + 1] & 0x0f; int sy = m_spriteram[offs + 2]; int sx = m_spriteram[offs + 3]; bool flip = flip_screen() ? true : false; int dir = 1; if (sy == 0) continue; if (flip) { sx = 240 - sx; sy = 240 - sy; dir = -1; } // draw sprite rows (16*16, 16*32, or 16*64) int row = (m_spriteram[offs + 1] & 0xc0) >> 6; if (row == 2) row = 3; for (; row >= 0; row--) gfx->transpen(bitmap, cliprect, code + row, color, flip, flip, sx, sy + 16 * row * dir, 15); } } uint32_t vulgus_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) { m_bg_tilemap->set_scrollx(0, m_scroll_low[1] + 256 * m_scroll_high[1]); m_bg_tilemap->set_scrolly(0, m_scroll_low[0] + 256 * m_scroll_high[0]); m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0); draw_sprites(bitmap, cliprect); m_fg_tilemap->draw(screen, bitmap, cliprect, 0, 0); return 0; }