Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-05-25 15:25:33 +03:00
Code Issues Actions Packages Projects Releases Wiki Activity

Merge pull request #2092 from SailorSat/master

Browse Source 
vicdual: nsub gradient
This commit is contained in:
Dirk Best 2017-03-06 22:14:39 +01:00 committed by GitHub
commit 58b3d34358
4 changed files with 24 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
src/mame/drivers/polyplay.cpp
View File

@ -268,7 +268,7 @@ ADDRESS_MAP_END
static ADDRESS_MAP_START( polyplay_io_zrepp, AS_IO, 8, polyplay_state )
AM_IMPORT_FROM(polyplay_io_zre)
// TODO: add SIO ports here
AM_RANGE(0x88, 0x8b) AM_DEVREADWRITE(Z80SIO_TAG, z80sio_device, read, write)
ADDRESS_MAP_END
static INPUT_PORTS_START( polyplay )

6
src/mame/drivers/vicdual.cpp
View File

@ -2247,7 +2247,11 @@ WRITE8_MEMBER(vicdual_state::nsub_io_w)
{
if (offset & 0x01) assert_coin_status();
if (offset & 0x02) { /* nsub_audio_w(0, data) */ }
if (offset & 0x04) palette_bank_w(space, 0, data);
if (offset & 0x04)
{
palette_bank_w(space, 0, data);
m_gradient = data & 4;
}
}

1
src/mame/includes/vicdual.h
View File

@ -58,6 +58,7 @@ public:
uint8_t m_coin_status;
uint8_t m_palette_bank;
uint8_t m_gradient;
uint8_t m_samurai_protection_data;
int m_nsub_coin_counter;
int m_nsub_play_counter;

17
src/mame/video/vicdual.cpp
View File

@ -112,6 +112,23 @@ uint32_t vicdual_state::screen_update_color(screen_device &screen, bitmap_rgb32
fore_pen = pens_from_color_prom[(color_prom[offs] >> 5) & 0x07];
}
if (m_gradient == 0x04)
{
// used by nsub and starrkr (maybe others)
// bit 4 on palette_bank_w seems to enable/disable the starfield/gradient
// how exactly those work is unclear right now
if (x >= 24 && x < 105)
{
// nsub - black to blue gradient
back_pen = rgb_t(0x00, 0x00, (x - 24) * 3);
}
if (x >= 105 && x < 233)
{
// nsub - blue to cyan gradient
back_pen = rgb_t(0x00, 0x80 + (x - 105), 0xff);
}
}
/* plot the current pixel */
pen = (video_data & 0x80) ? fore_pen : back_pen;
bitmap.pix32(y, x) = pen;