diff options
Diffstat (limited to 'src/mame/drivers/cave.cpp')
-rw-r--r-- | src/mame/drivers/cave.cpp | 20 |
1 files changed, 18 insertions, 2 deletions
diff --git a/src/mame/drivers/cave.cpp b/src/mame/drivers/cave.cpp index b8f3a0e0536..3df9d155d4f 100644 --- a/src/mame/drivers/cave.cpp +++ b/src/mame/drivers/cave.cpp @@ -2947,6 +2947,22 @@ void cave_state::unpack_sprites(int chip) } +/* 4 bits -> 8 bits. Even and odd pixels are not swapped */ +void cave_state::ddp_unpack_sprites(int chip) +{ + const uint32_t len = m_spriteregion[chip]->bytes(); + uint8_t *rgn = m_spriteregion[chip]->base(); + uint8_t *src = rgn + len / 2 - 1; + uint8_t *dst = rgn + len - 1; + + while(dst > src) + { + uint8_t data = *src--; + *dst-- = data & 0xf; *dst-- = data >> 4; + } +} + + /* 2 pages of 4 bits -> 8 bits */ void cave_state::esprade_unpack_sprites(int chip) { @@ -5155,7 +5171,7 @@ DRIVER_INIT_MEMBER(cave_state,ddonpach) { init_cave(); - unpack_sprites(0); + ddp_unpack_sprites(0); m_spritetype[0] = 1; // "different" sprites (no zooming?) m_time_vblank_irq = 90; } @@ -5164,7 +5180,7 @@ DRIVER_INIT_MEMBER(cave_state,donpachi) { init_cave(); - unpack_sprites(0); + ddp_unpack_sprites(0); m_spritetype[0] = 1; // "different" sprites (no zooming?) m_time_vblank_irq = 90; } |