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seicross: deobfuscate draw_sprites

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hap 2024-11-19 01:39:41 +01:00
parent e441312d77
commit f149e8fb77
1 changed files with 29 additions and 42 deletions
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71
src/mame/nichibutsu/seicross.cpp
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@ -193,10 +193,8 @@ void seicross_state::videoram_w(offs_t offset, uint8_t data)
void seicross_state::colorram_w(offs_t offset, uint8_t data)
{
/* bit 5 of the address is not used for color memory. There is just
512k of memory; every two consecutive rows share the same memory
region. */
// bit 5 of the address is not used for color memory. There is just 512k
// of memory; every two consecutive rows share the same memory region.
offset &= 0xffdf;
m_colorram[offset] = data;
@ -217,50 +215,37 @@ TILE_GET_INFO_MEMBER(seicross_state::get_bg_tile_info)
void seicross_state::video_start()
{
m_bg_tilemap = &machine().tilemap().create(
*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(seicross_state::get_bg_tile_info)), TILEMAP_SCAN_ROWS,
8, 8, 32, 32);
m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(seicross_state::get_bg_tile_info)), TILEMAP_SCAN_ROWS, 8, 8, 32, 32);
m_bg_tilemap->set_transparent_pen(0);
m_bg_tilemap->set_scroll_cols(32);
}
void seicross_state::draw_sprites(bitmap_ind16 &bitmap, const rectangle &cliprect)
{
for (int offs = m_spriteram[0].bytes() - 4; offs >= 0; offs -= 4)
for (int bank = 0; bank < 2; bank++)
{
int const x = m_spriteram[0][offs + 3];
m_gfxdecode->gfx(1)->transpen(bitmap, cliprect,
(m_spriteram[0][offs] & 0x3f) + ((m_spriteram[0][offs + 1] & 0x10) << 2) + 128,
m_spriteram[0][offs + 1] & 0x0f,
m_spriteram[0][offs] & 0x40, m_spriteram[0][offs] & 0x80,
x, 240 - m_spriteram[0][offs + 2], 0);
if (x > 0xf0)
m_gfxdecode->gfx(1)->transpen(bitmap, cliprect,
(m_spriteram[0][offs] & 0x3f) + ((m_spriteram[0][offs + 1] & 0x10) << 2) + 128,
m_spriteram[0][offs + 1] & 0x0f,
m_spriteram[0][offs] & 0x40, m_spriteram[0][offs] & 0x80,
x - 256, 240 - m_spriteram[0][offs + 2], 0);
}
for (int offs = m_spriteram[bank].bytes() - 4; offs >= 0; offs -= 4)
{
uint8_t const *data = &m_spriteram[bank][offs];
int const code = (data[0] & 0x3f) | ((data[1] & 0x10) << 2) | (bank ? 0 : 0x80);
int const color = data[1] & 0x0f;
int const flipx = BIT(data[0], 6);
int const flipy = BIT(data[0], 7);
int const x = data[3];
int const y = 240 - data[2];
for (int offs = m_spriteram[1].bytes() - 4; offs >= 0; offs -= 4)
{
int const x = m_spriteram[1][offs + 3];
m_gfxdecode->gfx(1)->transpen(bitmap, cliprect,
(m_spriteram[1][offs] & 0x3f) + ((m_spriteram[1][offs + 1] & 0x10) << 2),
m_spriteram[1][offs + 1] & 0x0f,
m_spriteram[1][offs] & 0x40, m_spriteram[1][offs] & 0x80,
x, 240 - m_spriteram[1][offs + 2], 0);
if (x > 0xf0)
m_gfxdecode->gfx(1)->transpen(bitmap, cliprect,
(m_spriteram[1][offs] & 0x3f) + ((m_spriteram[1][offs + 1] & 0x10) << 2),
m_spriteram[1][offs + 1] & 0x0f,
m_spriteram[1][offs] & 0x40, m_spriteram[1][offs] & 0x80,
x - 256, 240 - m_spriteram[1][offs + 2], 0);
m_gfxdecode->gfx(1)->transpen(bitmap, cliprect, code, color, flipx, flipy, x, y, 0);
if (x > 0xf0)
m_gfxdecode->gfx(1)->transpen(bitmap, cliprect, code, color, flipx, flipy, x - 256, y, 0);
}
}
}
uint32_t seicross_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
bitmap.fill(0, cliprect);
for (int col = 0; col < 32; col++)
m_bg_tilemap->set_scrolly(col, m_row_scroll[col]);
@ -272,9 +257,11 @@ uint32_t seicross_state::screen_update(screen_device &screen, bitmap_ind16 &bitm
void seicross_state::nvram_init(nvram_device &nvram, void *data, size_t size)
{
static const uint8_t init[32] = {
static const uint8_t init[32] =
{
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1,
0, 1, 0, 1, 0, 1, 0, 3, 0, 1, 0, 0, 0, 0, 0, 0, };
0, 1, 0, 1, 0, 1, 0, 3, 0, 1, 0, 0, 0, 0, 0, 0,
};
memset(data, 0x00, size);
memcpy(data, init, sizeof(init));
@ -396,7 +383,7 @@ static INPUT_PORTS_START( friskyt )
PORT_DIPNAME( 0x02, 0x00, "Connection Error" )
PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
PORT_DIPSETTING( 0x02, DEF_STR( On ) )
PORT_BIT( 0xfc, IP_ACTIVE_HIGH, IPT_UNKNOWN ) // probably unused
PORT_BIT( 0xfc, IP_ACTIVE_HIGH, IPT_UNKNOWN ) // probably unused
INPUT_PORTS_END
static INPUT_PORTS_START( radrad )
@ -423,7 +410,7 @@ static INPUT_PORTS_START( radrad )
PORT_START("TEST")
PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_BUTTON1 ) PORT_COCKTAIL
PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_BUTTON2 ) PORT_COCKTAIL
PORT_BIT( 0xfc, IP_ACTIVE_HIGH, IPT_UNKNOWN ) // probably unused
PORT_BIT( 0xfc, IP_ACTIVE_HIGH, IPT_UNKNOWN ) // probably unused
PORT_START("DSW1")
PORT_DIPNAME( 0x01, 0x01, DEF_STR( Cabinet ) )
@ -496,7 +483,7 @@ static INPUT_PORTS_START( seicross )
PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_COCKTAIL
PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_COCKTAIL
PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_SERVICE1 )
PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_UNKNOWN ) // probably unused
PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_UNKNOWN ) // probably unused
PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_BUTTON1 )
PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_BUTTON1 ) PORT_COCKTAIL
@ -505,7 +492,7 @@ static INPUT_PORTS_START( seicross )
PORT_DIPNAME( 0x02, 0x00, "Connection Error" )
PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
PORT_DIPSETTING( 0x02, DEF_STR( On ) )
PORT_BIT( 0xfc, IP_ACTIVE_HIGH, IPT_UNKNOWN ) // probably unused
PORT_BIT( 0xfc, IP_ACTIVE_HIGH, IPT_UNKNOWN ) // probably unused
PORT_START("DSW1")
PORT_DIPNAME( 0x01, 0x00, DEF_STR( Unknown ) )