// license:BSD-3-Clause // copyright-holders:Nicola Salmoria /*************************************************************************** video.c Functions to emulate the video hardware of the machine. ***************************************************************************/ #include "emu.h" #include "includes/firetrap.h" /*************************************************************************** Convert the color PROMs into a more useable format. Fire Trap has one 256x8 and one 256x4 palette PROMs. I don't know for sure how the palette PROMs are connected to the RGB output, but it's probably the usual: bit 7 -- 220 ohm resistor -- GREEN -- 470 ohm resistor -- GREEN -- 1 kohm resistor -- GREEN -- 2.2kohm resistor -- GREEN -- 220 ohm resistor -- RED -- 470 ohm resistor -- RED -- 1 kohm resistor -- RED bit 0 -- 2.2kohm resistor -- RED bit 3 -- 220 ohm resistor -- BLUE -- 470 ohm resistor -- BLUE -- 1 kohm resistor -- BLUE bit 0 -- 2.2kohm resistor -- BLUE ***************************************************************************/ void firetrap_state::firetrap_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; bit0 = (color_prom[i] >> 0) & 0x01; bit1 = (color_prom[i] >> 1) & 0x01; bit2 = (color_prom[i] >> 2) & 0x01; bit3 = (color_prom[i] >> 3) & 0x01; int const r = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3; bit0 = (color_prom[i] >> 4) & 0x01; bit1 = (color_prom[i] >> 5) & 0x01; bit2 = (color_prom[i] >> 6) & 0x01; bit3 = (color_prom[i] >> 7) & 0x01; int const g = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3; bit0 = (color_prom[i + palette.entries()] >> 0) & 0x01; bit1 = (color_prom[i + palette.entries()] >> 1) & 0x01; bit2 = (color_prom[i + palette.entries()] >> 2) & 0x01; bit3 = (color_prom[i + palette.entries()] >> 3) & 0x01; 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 ***************************************************************************/ TILEMAP_MAPPER_MEMBER(firetrap_state::get_fg_memory_offset) { return (row ^ 0x1f) + (col << 5); } TILEMAP_MAPPER_MEMBER(firetrap_state::get_bg_memory_offset) { return ((row & 0x0f) ^ 0x0f) | ((col & 0x0f) << 4) | /* hole at bit 8 */ ((row & 0x10) << 5) | ((col & 0x10) << 6); } TILE_GET_INFO_MEMBER(firetrap_state::get_fg_tile_info) { int code = m_fgvideoram[tile_index]; int color = m_fgvideoram[tile_index + 0x400]; SET_TILE_INFO_MEMBER(0, code | ((color & 0x01) << 8), color >> 4, 0); } inline void firetrap_state::get_bg_tile_info(tile_data &tileinfo, int tile_index, uint8_t *bgvideoram, int gfx_region) { int code = bgvideoram[tile_index]; int color = bgvideoram[tile_index + 0x100]; SET_TILE_INFO_MEMBER(gfx_region, code + ((color & 0x03) << 8), (color & 0x30) >> 4, TILE_FLIPXY((color & 0x0c) >> 2)); } TILE_GET_INFO_MEMBER(firetrap_state::get_bg1_tile_info) { get_bg_tile_info(tileinfo, tile_index, m_bg1videoram, 1); } TILE_GET_INFO_MEMBER(firetrap_state::get_bg2_tile_info) { get_bg_tile_info(tileinfo, tile_index, m_bg2videoram, 2); } /*************************************************************************** Start the video hardware emulation. ***************************************************************************/ void firetrap_state::video_start() { m_fg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(firetrap_state::get_fg_tile_info)), tilemap_mapper_delegate(*this, FUNC(firetrap_state::get_fg_memory_offset)), 8, 8, 32, 32); m_bg1_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(firetrap_state::get_bg1_tile_info)), tilemap_mapper_delegate(*this, FUNC(firetrap_state::get_bg_memory_offset)), 16, 16, 32, 32); m_bg2_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(firetrap_state::get_bg2_tile_info)), tilemap_mapper_delegate(*this, FUNC(firetrap_state::get_bg_memory_offset)), 16, 16, 32, 32); m_fg_tilemap->set_transparent_pen(0); m_bg1_tilemap->set_transparent_pen(0); } /*************************************************************************** Memory handlers ***************************************************************************/ WRITE8_MEMBER(firetrap_state::firetrap_fgvideoram_w) { m_fgvideoram[offset] = data; m_fg_tilemap->mark_tile_dirty(offset & 0x3ff); } WRITE8_MEMBER(firetrap_state::firetrap_bg1videoram_w) { m_bg1videoram[offset] = data; m_bg1_tilemap->mark_tile_dirty(offset & 0x6ff); } WRITE8_MEMBER(firetrap_state::firetrap_bg2videoram_w) { m_bg2videoram[offset] = data; m_bg2_tilemap->mark_tile_dirty(offset & 0x6ff); } WRITE8_MEMBER(firetrap_state::firetrap_bg1_scrollx_w) { m_scroll1_x[offset] = data; m_bg1_tilemap->set_scrollx(0, m_scroll1_x[0] | (m_scroll1_x[1] << 8)); } WRITE8_MEMBER(firetrap_state::firetrap_bg1_scrolly_w) { m_scroll1_y[offset] = data; m_bg1_tilemap->set_scrolly(0, -(m_scroll1_y[0] | (m_scroll1_y[1] << 8))); } WRITE8_MEMBER(firetrap_state::firetrap_bg2_scrollx_w) { m_scroll2_x[offset] = data; m_bg2_tilemap->set_scrollx(0, m_scroll2_x[0] | (m_scroll2_x[1] << 8)); } WRITE8_MEMBER(firetrap_state::firetrap_bg2_scrolly_w) { m_scroll2_y[offset] = data; m_bg2_tilemap->set_scrolly(0, -(m_scroll2_y[0] | (m_scroll2_y[1] << 8))); } /*************************************************************************** Display refresh ***************************************************************************/ void firetrap_state::draw_sprites( bitmap_ind16 &bitmap, const rectangle &cliprect ) { int offs; for (offs = 0; offs < m_spriteram.bytes(); offs += 4) { int sx, sy, flipx, flipy, code, color; /* the meaning of bit 3 of [offs] is unknown */ sy = m_spriteram[offs]; sx = m_spriteram[offs + 2]; code = m_spriteram[offs + 3] + 4 * (m_spriteram[offs + 1] & 0xc0); color = ((m_spriteram[offs + 1] & 0x08) >> 2) | (m_spriteram[offs + 1] & 0x01); flipx = m_spriteram[offs + 1] & 0x04; flipy = m_spriteram[offs + 1] & 0x02; if (flip_screen()) { sx = 240 - sx; sy = 240 - sy; flipx = !flipx; flipy = !flipy; } if (m_spriteram[offs + 1] & 0x10) /* double width */ { if (flip_screen()) sy -= 16; m_gfxdecode->gfx(3)->transpen(bitmap,cliprect, code & ~1, color, flipx,flipy, sx,flipy ? sy : sy + 16,0); m_gfxdecode->gfx(3)->transpen(bitmap,cliprect, code | 1, color, flipx,flipy, sx,flipy ? sy + 16 : sy,0); /* redraw with wraparound */ m_gfxdecode->gfx(3)->transpen(bitmap,cliprect, code & ~1, color, flipx,flipy, sx - 256,flipy ? sy : sy + 16,0); m_gfxdecode->gfx(3)->transpen(bitmap,cliprect, code | 1, color, flipx,flipy, sx - 256,flipy ? sy + 16 : sy,0); } else { m_gfxdecode->gfx(3)->transpen(bitmap,cliprect, code, color, flipx,flipy, sx,sy,0); /* redraw with wraparound */ m_gfxdecode->gfx(3)->transpen(bitmap,cliprect, code, color, flipx,flipy, sx - 256,sy,0); } } } uint32_t firetrap_state::screen_update_firetrap(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) { m_bg2_tilemap->draw(screen, bitmap, cliprect, 0, 0); m_bg1_tilemap->draw(screen, bitmap, cliprect, 0, 0); draw_sprites(bitmap, cliprect); m_fg_tilemap->draw(screen, bitmap, cliprect, 0, 0); return 0; }