// license:BSD-3-Clause // copyright-holders:Aaron Giles /*************************************************************************** Midway MCR systems ***************************************************************************/ #include "emu.h" #include "includes/mcr.h" #include "screen.h" /************************************* * * Tilemap callbacks * *************************************/ /* The 90009 board uses 1 byte per tile: Byte 0: pppppppp = picture index */ TILE_GET_INFO_MEMBER(mcr_state::mcr_90009_get_tile_info) { SET_TILE_INFO_MEMBER(0, m_videoram[tile_index], 0, 0); /* sprite color base is constant 0x10 */ tileinfo.category = 1; } /* The 90010 board uses 2 adjacent bytes per tile: Byte 0: pppppppp = picture index (low 8 bits) Byte 1: ss------ = sprite palette bank ---cc--- = tile palette bank -----y-- = Y flip ------x- = X flip -------p = picture index (high 1 bit) */ TILE_GET_INFO_MEMBER(mcr_state::mcr_90010_get_tile_info) { int data = m_videoram[tile_index * 2] | (m_videoram[tile_index * 2 + 1] << 8); int code = data & 0x1ff; int color = (data >> 11) & 3; SET_TILE_INFO_MEMBER(0, code, color, TILE_FLIPYX(data >> 9)); /* sprite color base comes from the top 2 bits */ tileinfo.category = (data >> 14) & 3; } /* The 91490 board uses 2 adjacent bytes per tile: Byte 0: pppppppp = picture index (low 8 bits) Byte 1: ss------ = sprite palette bank (can be disabled via jumpers) --cc---- = tile palette bank ----y--- = Y flip -----x-- = X flip ------pp = picture index (high 2 bits) */ TILE_GET_INFO_MEMBER(mcr_state::mcr_91490_get_tile_info) { int data = m_videoram[tile_index * 2] | (m_videoram[tile_index * 2 + 1] << 8); int code = data & 0x3ff; int color = (data >> 12) & 3; SET_TILE_INFO_MEMBER(0, code, color, TILE_FLIPYX(data >> 10)); /* sprite color base might come from the top 2 bits */ tileinfo.category = (data >> 14) & 3; } /************************************* * * Common video startup/shutdown * *************************************/ void mcr_state::video_start() { /* the tilemap callback is based on the CPU board */ switch (m_mcr_cpu_board) { case 90009: m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(mcr_state::mcr_90009_get_tile_info)), TILEMAP_SCAN_ROWS, 16,16, 32,30); break; case 90010: m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(mcr_state::mcr_90010_get_tile_info)), TILEMAP_SCAN_ROWS, 16,16, 32,30); break; case 91475: m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(mcr_state::mcr_90010_get_tile_info)), TILEMAP_SCAN_ROWS, 16,16, 32,30); break; case 91490: m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(mcr_state::mcr_91490_get_tile_info)), TILEMAP_SCAN_ROWS, 16,16, 32,30); break; default: throw emu_fatalerror("mcr_state::video_start: Unknown mcr board"); break; } } /************************************* * * Palette RAM writes * *************************************/ void mcr_state::mcr_set_color(int index, int data) { m_palette->set_pen_color(index, pal3bit(data >> 6), pal3bit(data >> 0), pal3bit(data >> 3)); } void mcr_state::journey_set_color(int index, int data) { /* 3 bits each, RGB */ int r = (data >> 6) & 7; int g = (data >> 0) & 7; int b = (data >> 3) & 7; /* up to 8 bits */ r = (r << 5) | (r << 1); g = (g << 5) | (g << 1); b = (b << 5) | (b << 1); /* set the BG color */ m_palette->set_pen_color(index, rgb_t(r, g, b)); /* if this is an odd entry in the upper palette bank, the hardware */ /* hard-codes a low 1 bit -- this is used for better grayscales */ if ((index & 0x31) == 0x31) { r |= 0x11; g |= 0x11; b |= 0x11; } /* set the FG color */ m_palette->set_pen_color(index + 64, rgb_t(r, g, b)); } WRITE8_MEMBER(mcr_state::mcr_paletteram9_w) { // palette RAM is actually 9 bit (a 93419 SRAM) // however, there is no way for the CPU to read back // the high bit, because D8 of the SRAM is connected // to A0 of the bus rather than to a data line m_paletteram[offset] = data; mcr_set_color(offset / 2, data | ((offset & 1) << 8)); } /************************************* * * Video RAM writes * *************************************/ WRITE8_MEMBER(mcr_state::mcr_90009_videoram_w) { m_videoram[offset] = data; m_bg_tilemap->mark_tile_dirty(offset); } WRITE8_MEMBER(mcr_state::mcr_90010_videoram_w) { m_videoram[offset] = data; m_bg_tilemap->mark_tile_dirty(offset / 2); /* palette RAM is mapped into the upper 0x80 bytes here */ if ((offset & 0x780) == 0x780) { if (m_mcr_cpu_board != 91475) mcr_set_color((offset / 2) & 0x3f, data | ((offset & 1) << 8)); else journey_set_color((offset / 2) & 0x3f, data | ((offset & 1) << 8)); } } READ8_MEMBER(mcr_state::twotiger_videoram_r) { /* Two Tigers swizzles the address bits on videoram */ int effoffs = ((offset << 1) & 0x7fe) | ((offset >> 10) & 1); return m_videoram[effoffs]; } WRITE8_MEMBER(mcr_state::twotiger_videoram_w) { /* Two Tigers swizzles the address bits on videoram */ int effoffs = ((offset << 1) & 0x7fe) | ((offset >> 10) & 1); m_videoram[effoffs] = data; m_bg_tilemap->mark_tile_dirty(effoffs / 2); /* palette RAM is mapped into the upper 0x80 bytes here */ if ((effoffs & 0x780) == 0x780) mcr_set_color(((offset & 0x400) >> 5) | ((offset >> 1) & 0x1f), data | ((offset & 1) << 8)); } WRITE8_MEMBER(mcr_state::mcr_91490_videoram_w) { m_videoram[offset] = data; m_bg_tilemap->mark_tile_dirty(offset / 2); } /************************************* * * 91399 Video Gen sprite renderer * * Paired with: * 90009 CPU -> fixed palette @ 1 * 90010 CPU -> palette specified by tiles * *************************************/ void mcr_state::render_sprites_91399(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) { gfx_element *gfx = m_gfxdecode->gfx(1); /* render the sprites into the bitmap, ORing together */ for (int offs = 0; offs < m_spriteram.bytes(); offs += 4) { /* extract the bits of information */ int code = m_spriteram[offs + 1] & 0x3f; int hflip = (m_spriteram[offs + 1] & 0x40) ? 31 : 0; int vflip = (m_spriteram[offs + 1] & 0x80) ? 31 : 0; int sx = (m_spriteram[offs + 2] - 4) * 2; int sy = (240 - m_spriteram[offs]) * 2; /* apply cocktail mode */ if (m_mcr_cocktail_flip) { hflip ^= 31; vflip ^= 31; sx = 466 - sx + m_mcr12_sprite_xoffs_flip; sy = 450 - sy; } else sx += m_mcr12_sprite_xoffs; /* clamp within 512 */ sx &= 0x1ff; sy &= 0x1ff; /* loop over lines in the sprite */ for (int y = 0; y < 32; y++, sy = (sy + 1) & 0x1ff) if (sy >= cliprect.min_y && sy <= cliprect.max_y) { const uint8_t *src = gfx->get_data(code) + gfx->rowbytes() * (y ^ vflip); uint16_t *dst = &bitmap.pix16(sy); uint8_t *pri = &screen.priority().pix8(sy); /* loop over columns */ for (int x = 0; x < 32; x++) { int tx = (sx + x) & 0x1ff; int pix = pri[tx] | src[x ^ hflip]; /* update the effective sprite pixel */ pri[tx] = pix; /* only draw if the low 3 bits are set */ if (pix & 0x07) dst[tx] = pix; } } } } /************************************* * * 91464 Super Video Gen sprite renderer * * Paired with: * 91442 CPU -> fixed palette @ 1 (upper half) or 3 (lower half) * 91475 CPU -> palette specified by sprite board; sprites have extra implicit colors * 91490 CPU -> palette specified by sprite board or by tiles (select via jumpers) * 91721 CPU -> palette specified by sprite board * *************************************/ void mcr_state::render_sprites_91464(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect, int primask, int sprmask, int colormask) { gfx_element *gfx = m_gfxdecode->gfx(1); /* render the sprites into the bitmap, working from topmost to bottommost */ for (int offs = m_spriteram.bytes() - 4; offs >= 0; offs -= 4) { /* extract the bits of information */ int code = (m_spriteram[offs + 2] + 256 * ((m_spriteram[offs + 1] >> 3) & 0x01)) % gfx->elements(); int color = (((~m_spriteram[offs + 1] & 3) << 4) & sprmask) | colormask; int hflip = (m_spriteram[offs + 1] & 0x10) ? 31 : 0; int vflip = (m_spriteram[offs + 1] & 0x20) ? 31 : 0; int sx = (m_spriteram[offs + 3] - 3) * 2; int sy = (241 - m_spriteram[offs]) * 2; /* apply cocktail mode */ if (m_mcr_cocktail_flip) { hflip ^= 31; vflip ^= 31; sx = 480 - sx; sy = 452 - sy; } /* clamp within 512 */ sx &= 0x1ff; sy &= 0x1ff; /* loop over lines in the sprite */ for (int y = 0; y < 32; y++, sy = (sy + 1) & 0x1ff) if (sy >= 2 && sy >= cliprect.min_y && sy <= cliprect.max_y) { const uint8_t *src = gfx->get_data(code) + gfx->rowbytes() * (y ^ vflip); uint16_t *dst = &bitmap.pix16(sy); uint8_t *pri = &screen.priority().pix8(sy); /* loop over columns */ for (int x = 0; x < 32; x++) { int tx = (sx + x) & 0x1ff; int pix = pri[tx]; if (pix != 0xff) { /* compute the final value */ pix = (pix & primask) | color | src[x ^ hflip]; /* if non-zero, draw */ if (pix & 0x0f) { /* mark this pixel so we don't draw there again */ pri[tx] = 0xff; /* only draw if the low 3 bits are set */ if (pix & 0x07) dst[tx] = pix; } } } } } } /************************************* * * Main refresh routines * *************************************/ uint32_t mcr_state::screen_update_mcr(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) { /* update the flip state */ m_bg_tilemap->set_flip(m_mcr_cocktail_flip ? (TILEMAP_FLIPX | TILEMAP_FLIPY) : 0); /* draw the background */ screen.priority().fill(0, cliprect); m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0x00); m_bg_tilemap->draw(screen, bitmap, cliprect, 1, 0x10); m_bg_tilemap->draw(screen, bitmap, cliprect, 2, 0x20); m_bg_tilemap->draw(screen, bitmap, cliprect, 3, 0x30); /* update the sprites and render them */ switch (m_mcr_sprite_board) { case 91399: render_sprites_91399(screen, bitmap, cliprect); break; case 91464: if (m_mcr_cpu_board == 91442) render_sprites_91464(screen, bitmap, cliprect, 0x00, 0x30, 0x00); else if (m_mcr_cpu_board == 91475) render_sprites_91464(screen, bitmap, cliprect, 0x00, 0x30, 0x40); else if (m_mcr_cpu_board == 91490) render_sprites_91464(screen, bitmap, cliprect, 0x00, 0x30, 0x00); else if (m_mcr_cpu_board == 91721) render_sprites_91464(screen, bitmap, cliprect, 0x00, 0x30, 0x00); break; } return 0; }