// license:BSD-3-Clause // copyright-holders:David Haywood /*************************************************************************** redclash.cpp Functions to emulate the video hardware of the machine. ***************************************************************************/ #include "emu.h" #include "includes/redclash.h" #include "video/resnet.h" /*************************************************************************** Convert the color PROMs into a more useable format. I'm using the same palette conversion as Lady Bug, but the Zero Hour schematics show a different resistor network. ***************************************************************************/ void redclash_state::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 < 0x20; i++) { int bit0, bit1; // red component bit0 = BIT(color_prom[i], 0); bit1 = BIT(color_prom[i], 5); int const r = 0x47 * bit0 + 0x97 * bit1; // green component bit0 = BIT(color_prom[i], 2); bit1 = BIT(color_prom[i], 6); int const g = 0x47 * bit0 + 0x97 * bit1; // blue component bit0 = BIT(color_prom[i], 4); bit1 = BIT(color_prom[i], 7); int const b = 0x47 * bit0 + 0x97 * bit1; palette.set_indirect_color(i, rgb_t(r, g, b)); } // star colors for (int i = 0; i < 0x20; i++) { int bit0, bit1; // red component bit0 = BIT(i, 3); bit1 = BIT(i, 4); int const b = 0x47 * bit0 + 0x97 * bit1; // green component bit0 = BIT(i, 1); bit1 = BIT(i, 2); int const g = 0x47 * bit0 + 0x97 * bit1; // blue component bit0 = BIT(i, 0); int const r = 0x47 * bit0; palette.set_indirect_color(i + 0x20, rgb_t(r, g, b)); } // color_prom now points to the beginning of the lookup table color_prom += 0x20; // characters for (int i = 0; i < 0x20; i++) { uint8_t const ctabentry = ((i << 3) & 0x18) | ((i >> 2) & 0x07); palette.set_pen_indirect(i, ctabentry); } // sprites for (int i = 0; i < 0x20; i++) { uint8_t ctabentry; ctabentry = bitswap<4>((color_prom[i] >> 0) & 0x0f, 0,1,2,3); palette.set_pen_indirect(i + 0x20, ctabentry); ctabentry = bitswap<4>((color_prom[i] >> 4) & 0x0f, 0,1,2,3); palette.set_pen_indirect(i + 0x40, ctabentry); } // stars for (int i = 0; i < 0x20; i++) palette.set_pen_indirect(i + 0x60, i + 0x20); } void redclash_state::videoram_w(offs_t offset, uint8_t data) { m_videoram[offset] = data; m_fg_tilemap->mark_tile_dirty(offset); } WRITE_LINE_MEMBER(redclash_state::gfxbank_w) { if (m_gfxbank != state) { m_gfxbank = state; m_fg_tilemap->mark_all_dirty(); } } WRITE_LINE_MEMBER(redclash_state::flipscreen_w) { flip_screen_set(state); } void redclash_state::star_reset_w(uint8_t data) { m_stars->set_enable(true); } TILE_GET_INFO_MEMBER(redclash_state::get_fg_tile_info) { int code = m_videoram[tile_index]; int color = (m_videoram[tile_index] & 0x70) >> 4; // ?? tileinfo.set(0, code, color, 0); } void redclash_state::video_start() { m_fg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(redclash_state::get_fg_tile_info)), TILEMAP_SCAN_ROWS, 8, 8, 32, 32); m_fg_tilemap->set_transparent_pen(0); } void redclash_state::draw_sprites(bitmap_ind16 &bitmap, const rectangle &cliprect) { for (int offs = m_spriteram.bytes() - 0x20; offs >= 0; offs -= 0x20) { int i = 0; while (i < 0x20 && m_spriteram[offs + i] != 0) i += 4; while (i > 0) { i -= 4; if (m_spriteram[offs + i] & 0x80) { int color = m_spriteram[offs + i + 2] & 0x0f; int sx = m_spriteram[offs + i + 3]; int sy = offs / 4 + (m_spriteram[offs + i] & 0x07); switch ((m_spriteram[offs + i] & 0x18) >> 3) { case 3: /* 24x24 */ { int code = ((m_spriteram[offs + i + 1] & 0xf0) >> 4) + ((m_gfxbank & 1) << 4); m_gfxdecode->gfx(3)->transpen(bitmap,cliprect, code, color, 0,0, sx,sy - 16,0); /* wraparound */ m_gfxdecode->gfx(3)->transpen(bitmap,cliprect, code, color, 0,0, sx - 256,sy - 16,0); break; } case 2: /* 16x16 */ if (m_spriteram[offs + i] & 0x20) /* zero hour spaceships */ { int code = ((m_spriteram[offs + i + 1] & 0xf8) >> 3) + ((m_gfxbank & 1) << 5); int bank = (m_spriteram[offs + i + 1] & 0x02) >> 1; m_gfxdecode->gfx(4+bank)->transpen(bitmap,cliprect, code, color, 0,0, sx,sy - 16,0); } else { int code = ((m_spriteram[offs + i + 1] & 0xf0) >> 4) + ((m_gfxbank & 1) << 4); m_gfxdecode->gfx(2)->transpen(bitmap,cliprect, code, color, 0,0, sx,sy - 16,0); } break; case 1: /* 8x8 */ m_gfxdecode->gfx(1)->transpen(bitmap,cliprect, m_spriteram[offs + i + 1],// + 4 * (m_spriteram[offs + i + 2] & 0x10), color, 0,0, sx,sy - 16,0); break; case 0: popmessage("unknown sprite size 0"); break; } } } } } void redclash_state::draw_bullets( bitmap_ind16 &bitmap, const rectangle &cliprect ) { for (int offs = 0; offs < 0x20; offs++) { // sx = m_videoramoffs]; int sx = 8 * offs + (m_videoram[offs] & 0x07); /* ?? */ int sy = 0xff - m_videoram[offs + 0x20]; if (flip_screen()) { sx = 240 - sx; } if (cliprect.contains(sx, sy)) bitmap.pix(sy, sx) = 0x19; } } WRITE_LINE_MEMBER(redclash_state::screen_vblank) { // falling edge if (!state) m_stars->update_state(); } uint32_t redclash_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) { bitmap.fill(m_palette->black_pen(), cliprect); m_stars->draw(bitmap, cliprect, 0x60, true, 0x00, 0xff); draw_sprites(bitmap, cliprect); draw_bullets(bitmap, cliprect); m_fg_tilemap->draw(screen, bitmap, cliprect, 0, 0); return 0; }