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misc/istellar.cpp: confirm sprite priority, pinpoint overlay control

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This commit is contained in:
angelosa 2023-11-28 14:57:36 +01:00
parent bbc04cf1bf
commit 9a00b08af8
1 changed files with 17 additions and 6 deletions
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23
src/mame/misc/istellar.cpp
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@ -83,6 +83,9 @@ private:
void tile_w(offs_t offset, uint8_t data);
void attr_w(offs_t offset, uint8_t data);
void overlay_control_w(uint8_t data);
u8 m_overlay_ctrl = 0;
uint8_t z80_2_ldp_read();
uint8_t z80_2_unknown_read();
@ -126,9 +129,14 @@ void istellar_state::video_start()
uint32_t istellar_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
{
bitmap.fill(0, cliprect);
// TODO: should really draw transparent when bit 7 disabled, also gradient to be verified.
// (May actually be an opaque flag for tilemap + pal bank?)
bitmap.fill(BIT(m_overlay_ctrl, 7) ? rgb_t(0x00, 0x00, 0xff) : rgb_t(0, 0, 0), cliprect);
// sprites, below tilemap according to ref
m_fg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
// sprites, above tilemap according to PCB refs for both games
// (Daphne is wrong and draws below, unless a bit is set for enemy sprites?)
for (int i = 0; i < m_sprite_ram.bytes(); i += 4)
{
u8 const attr = m_sprite_ram[i + 2];
@ -150,8 +158,6 @@ uint32_t istellar_state::screen_update(screen_device &screen, bitmap_rgb32 &bitm
);
}
m_fg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
return 0;
}
@ -188,7 +194,12 @@ void istellar_state::z80_2_ldp_write(uint8_t data)
m_laserdisc->data_w(data);
}
void istellar_state::overlay_control_w(uint8_t data)
{
m_overlay_ctrl = data;
if (data & 0x7f)
logerror("overlay_control_w: %02x\n", data);
}
// PROGRAM MAPS
void istellar_state::z80_0_mem(address_map &map)
@ -221,7 +232,7 @@ void istellar_state::z80_0_io(address_map &map)
map(0x00, 0x00).portr("IN0");
map(0x02, 0x02).portr("DSW1");
map(0x03, 0x03).portr("DSW2");
// map(0x04, 0x04).w(FUNC(istellar_state::volatile_palette_write));
map(0x04, 0x04).w(FUNC(istellar_state::overlay_control_w));
map(0x05, 0x05).r("latch1", FUNC(generic_latch_8_device::read)).w("latch2", FUNC(generic_latch_8_device::write));
}