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misc/mirderby.cpp: improve sprites

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This commit is contained in:
angelosa 2023-11-11 22:13:09 +01:00
parent c2dafc5903
commit 38ca6ca9a8
1 changed files with 29 additions and 29 deletions
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58
src/mame/misc/mirderby.cpp
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@ -214,39 +214,41 @@ void mirderby_state::draw_sprites(bitmap_ind16 &bitmap, const rectangle &cliprec
gfx_element * const gfx = m_gfxdecode->gfx(0);
// TODO: gets corrupted during gameplay, moving entries with an offset of $-2
// TODO: width/height is a complete mystery
// writes multiple identical entries to different places,
// cfr. pinballs in gameplay from $800 onward (tilecode=$c0)
for (; source < finish; source += 4 )
{
u16 code = source[ 2 ] << 2;
const u8 tile = source[ 2 ];
// 0xc0 pinballs (0x300)
// 0xdf opaque box on title (0x36e)
// 0xd5 lower start gate (0x340 - 0x360)
// 0x37 jockey
u16 code = (tile & 0xf8) << 2 | (tile & 0x07) << 1;
u8 attr = source[ 1 ];
int sx = source[ 3 ];
int sy = (0xf0 - source[ 0 ]) & 0xff;
// TODO: bit 5 can't be flipx, it would cross top row horses on purple bet screen
// more like an internal copy they disabled with this?
int sx = source[ 3 ] + ((attr & 0x30) << 4);
int sy = (0xf1 - source[ 0 ]) & 0xff;
u8 color = attr & 0xf;
if (attr & 0x10)
sx += 0x100;
// TODO: missing sprites (signed wraparound?)
//if (attr == 0)
// continue;
gfx->transpen(bitmap,cliprect,
code, color,
0, 0, //flipx, flipy,
sx, sy, 0);
gfx->transpen(bitmap,cliprect,
code + 1, color,
0, 0, //flipx, flipy,
sx + 8, sy, 0);
gfx->transpen(bitmap,cliprect,
code + 0x10, color,
0, 0, //flipx, flipy,
sx, sy + 8, 0);
gfx->transpen(bitmap,cliprect,
code + 0x11, color,
0, 0, //flipx, flipy,
sx + 8, sy + 8, 0);
// draws in block strips of 16x16
const u8 tile_offs[4] = { 0, 1, 0x10, 0x11 };
const int draw_x[4] = { -4, 4, -4, 4 };
const int draw_y[4] = { 0, 0, 8, 8 };
for (int block_i = 0; block_i < 4; block_i ++)
{
gfx->transpen(bitmap, cliprect,
code + tile_offs[block_i], color,
0, 0,
sx + draw_x[block_i],
sy + draw_y[block_i],
0);
}
}
}
@ -274,8 +276,8 @@ uint32_t mirderby_state::screen_update(screen_device &screen, bitmap_ind16 &bitm
// just writes a 0x7c to $7ffa
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);
draw_sprites(bitmap, cliprect);
m_bg_tilemap->draw(screen, bitmap, cliprect, TILEMAP_DRAW_CATEGORY(1), 0);
}
return 0;
@ -486,7 +488,7 @@ static INPUT_PORTS_START( mirderby )
PORT_START("IN1")
PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_SERVICE1 ) // analyzer
PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNKNOWN ) // hangs game if triggered, debug aid?
PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNKNOWN ) // hangs game if triggered, break from external debugger?
// p1 side
// TODO: sketchy layout, derived from kingdrby.cpp
@ -662,12 +664,11 @@ void mirderby_state::mirderby(machine_config &config)
// config.set_maximum_quantum(attotime::from_hz(6000));
config.set_perfect_quantum("maincpu");
/* video hardware */
SCREEN(config, m_screen, SCREEN_TYPE_RASTER);
m_screen->set_refresh_hz(59);
m_screen->set_vblank_time(ATTOSECONDS_IN_USEC(2500));
m_screen->set_size(64*8, 32*8);
m_screen->set_visarea(0*8, 50*8-1, 1*8, 31*8-1);
m_screen->set_visarea(1*8, 50*8-1, 2*8, 30*8-1);
m_screen->set_screen_update(FUNC(mirderby_state::screen_update));
m_screen->set_palette(m_palette);
m_screen->screen_vblank().set(FUNC(mirderby_state::screen_vblank));
@ -675,7 +676,6 @@ void mirderby_state::mirderby(machine_config &config)
GFXDECODE(config, m_gfxdecode, m_palette, gfx_mirderby);
PALETTE(config, m_palette, FUNC(mirderby_state::palette_init), 0x100);
/* sound hardware */
SPEAKER(config, "speaker").front_center();
YM2203(config, m_ymsnd, 2'000'000);