diff options
Diffstat (limited to 'src/mame/video/exprraid.cpp')
-rw-r--r-- | src/mame/video/exprraid.cpp | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/src/mame/video/exprraid.cpp b/src/mame/video/exprraid.cpp new file mode 100644 index 00000000000..2ff324fe57f --- /dev/null +++ b/src/mame/video/exprraid.cpp @@ -0,0 +1,138 @@ +// license:BSD-3-Clause +// copyright-holders:Ernesto Corvi +#include "emu.h" +#include "includes/exprraid.h" + + +WRITE8_MEMBER(exprraid_state::exprraid_videoram_w) +{ + m_videoram[offset] = data; + m_fg_tilemap->mark_tile_dirty(offset); +} + +WRITE8_MEMBER(exprraid_state::exprraid_colorram_w) +{ + m_colorram[offset] = data; + m_fg_tilemap->mark_tile_dirty(offset); +} + +WRITE8_MEMBER(exprraid_state::exprraid_flipscreen_w) +{ + if (flip_screen() != (data & 0x01)) + { + flip_screen_set(data & 0x01); + machine().tilemap().mark_all_dirty(); + } +} + +WRITE8_MEMBER(exprraid_state::exprraid_bgselect_w) +{ + if (m_bg_index[offset] != data) + { + m_bg_index[offset] = data; + m_bg_tilemap->mark_all_dirty(); + } +} + +WRITE8_MEMBER(exprraid_state::exprraid_scrollx_w) +{ + m_bg_tilemap->set_scrollx(offset, data); +} + +WRITE8_MEMBER(exprraid_state::exprraid_scrolly_w) +{ + m_bg_tilemap->set_scrolly(0, data); +} + +TILE_GET_INFO_MEMBER(exprraid_state::get_bg_tile_info) +{ + UINT8 *tilerom = memregion("gfx4")->base(); + + int data, attr, bank, code, color, flags; + int quadrant = 0, offs; + + int sx = tile_index % 32; + int sy = tile_index / 32; + + if (sx >= 16) quadrant++; + if (sy >= 16) quadrant += 2; + + offs = (sy % 16) * 16 + (sx % 16) + (m_bg_index[quadrant] & 0x3f) * 0x100; + + data = tilerom[offs]; + attr = tilerom[offs + 0x4000]; + bank = (2 * (attr & 0x03) + ((data & 0x80) >> 7)) + 2; + code = data & 0x7f; + color = (attr & 0x18) >> 3; + flags = (attr & 0x04) ? TILE_FLIPX : 0; + + tileinfo.category = ((attr & 0x80) ? 1 : 0); + + SET_TILE_INFO_MEMBER(bank, code, color, flags); +} + +TILE_GET_INFO_MEMBER(exprraid_state::get_fg_tile_info) +{ + int attr = m_colorram[tile_index]; + int code = m_videoram[tile_index] + ((attr & 0x07) << 8); + int color = (attr & 0x10) >> 4; + + SET_TILE_INFO_MEMBER(0, code, color, 0); +} + +void exprraid_state::video_start() +{ + m_bg_tilemap = &machine().tilemap().create(m_gfxdecode, tilemap_get_info_delegate(FUNC(exprraid_state::get_bg_tile_info),this), TILEMAP_SCAN_ROWS, 16, 16, 32, 32); + m_fg_tilemap = &machine().tilemap().create(m_gfxdecode, tilemap_get_info_delegate(FUNC(exprraid_state::get_fg_tile_info),this), TILEMAP_SCAN_ROWS, 8, 8, 32, 32); + + m_bg_tilemap->set_scroll_rows(2); + m_fg_tilemap->set_transparent_pen(0); +} + +void exprraid_state::draw_sprites( bitmap_ind16 &bitmap, const rectangle &cliprect ) +{ + int offs; + + for (offs = 0; offs < m_spriteram.bytes(); offs += 4) + { + int attr = m_spriteram[offs + 1]; + int code = m_spriteram[offs + 3] + ((attr & 0xe0) << 3); + int color = (attr & 0x03) + ((attr & 0x08) >> 1); + int flipx = (attr & 0x04); + int flipy = 0; + int sx = ((248 - m_spriteram[offs + 2]) & 0xff) - 8; + int sy = m_spriteram[offs]; + + if (flip_screen()) + { + sx = 240 - sx; + sy = 240 - sy; + flipx = !flipx; + flipy = !flipy; + } + + m_gfxdecode->gfx(1)->transpen(bitmap,cliprect, + code, color, + flipx, flipy, + sx, sy, 0); + + /* double height */ + + if (attr & 0x10) + { + m_gfxdecode->gfx(1)->transpen(bitmap,cliprect, + code + 1, color, + flipx, flipy, + sx, sy + (flip_screen() ? -16 : 16), 0); + } + } +} + +UINT32 exprraid_state::screen_update_exprraid(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) +{ + m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0); + draw_sprites(bitmap, cliprect); + m_bg_tilemap->draw(screen, bitmap, cliprect, 1, 0); + m_fg_tilemap->draw(screen, bitmap, cliprect, 0, 0); + return 0; +} |