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misc/mirderby.cpp: assume scroll disables thru $7ffa

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This commit is contained in:
angelosa 2023-11-09 22:22:54 +01:00
parent a916c017ca
commit 1381304af0
1 changed files with 24 additions and 8 deletions
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32
src/mame/misc/mirderby.cpp
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@ -155,6 +155,7 @@ private:
u8 m_key_matrix = 0;
u16 m_scrollx = 0;
bool m_scrollx_enable = false;
};
void mirderby_state::palette_init(palette_device &palette) const
@ -200,16 +201,24 @@ uint32_t mirderby_state::screen_update(screen_device &screen, bitmap_ind16 &bitm
{
bitmap.fill(m_palette->black_pen(), cliprect);
// category 1 is for scrolling elements, probably high priority too
// TODO: gets screwy on race result screen, may scroll disable somehow?
m_bg_tilemap->set_scrollx(0, m_scrollx & 0x1ff);
m_bg_tilemap->draw(screen, bitmap, cliprect, TILEMAP_DRAW_CATEGORY(0), 0);
if (m_scrollx_enable)
{
// category 1 is for scrolling elements, probably high priority wrt sprites too
m_bg_tilemap->set_scrollx(0, m_scrollx & 0x1ff);
m_bg_tilemap->draw(screen, bitmap, cliprect, TILEMAP_DRAW_CATEGORY(0), 0);
m_bg_tilemap->set_scrollx(0, 0);
m_bg_tilemap->draw(screen, bitmap, cliprect, TILEMAP_DRAW_CATEGORY(0), 0);
m_bg_tilemap->set_scrollx(0, 0);
m_bg_tilemap->draw(screen, bitmap, cliprect, TILEMAP_DRAW_CATEGORY(0), 0);
m_bg_tilemap->set_scrollx(0, m_scrollx & 0x1ff);
m_bg_tilemap->draw(screen, bitmap, cliprect, TILEMAP_DRAW_CATEGORY(1), 0);
m_bg_tilemap->set_scrollx(0, m_scrollx & 0x1ff);
m_bg_tilemap->draw(screen, bitmap, cliprect, TILEMAP_DRAW_CATEGORY(1), 0);
}
else
{
m_bg_tilemap->set_scrollx(0, 0);
m_bg_tilemap->draw(screen, bitmap, cliprect, TILEMAP_DRAW_CATEGORY(0), 0);
m_bg_tilemap->draw(screen, bitmap, cliprect, TILEMAP_DRAW_CATEGORY(1), 0);
}
return 0;
}
@ -270,9 +279,16 @@ void mirderby_state::shared_map(address_map &map)
return res;
})
);
map(0x7ffa, 0x7ffa).lw8(
NAME([this] (u8 data) {
// TODO: other bits, hardly used so complete guess (0xb0 vs. 0x7c)
m_scrollx_enable = bool(BIT(data, 7));
})
);
map(0x7ffb, 0x7ffb).lr8(
NAME([] () {
// will prevent working inputs if non-zero on betting screen
// maps 100 Yen at least, with bit 4 + 7 off
return 0;
})
);