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tv912.cpp: Improve half-dot shifting (nw)

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This commit is contained in:
AJR 2018-01-22 12:27:52 -05:00
parent 5c6a074260
commit 996d54cf43
1 changed files with 9 additions and 3 deletions
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12
src/mame/drivers/tv912.cpp
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@ -258,6 +258,12 @@ void tv912_state::device_timer(emu_timer &timer, device_timer_id id, int param,
u32 tv912_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
{
if (m_crtc->screen_reset())
{
bitmap.fill(rgb_t::black(), cliprect);
return 0;
}
u8 *dispram = static_cast<u8 *>(m_dispram_bank->base());
ioport_value videoctrl = m_video_control->read();
@ -281,7 +287,7 @@ u32 tv912_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, cons
u8 data = (ra > 0 && ra < 9) ? charbase[(ch & 0x7f) << 3] : 0;
u8 dots = data >> 2;
bool adv = BIT(data, 0);
bool adv = BIT(data, 1);
for (int d = 0; d < 7; d++)
{
@ -296,8 +302,8 @@ u32 tv912_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, cons
if (!adv)
dots <<= 1;
if (d == 3)
adv = BIT(data, 1);
if (d == 2)
adv = BIT(data, 0);
}
}
}