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cit101: Add preliminary video (nw)

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AJR 2018-04-30 14:48:36 -04:00
parent e3ad8c6d2d
commit 4c5e0ecd0e
1 changed files with 25 additions and 0 deletions
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25
src/mame/drivers/cit101.cpp
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@ -104,6 +104,31 @@ void cit101_state::machine_start()
u32 cit101_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
{
int char_width = 9;
for (int y = cliprect.top(); y <= cliprect.bottom(); y++)
{
int row = (y / 10) + 1;
int line = y % 10;
u16 rowaddr = m_mainram[row * 2] | (m_extraram[row * 2] & 0x3f) << 8;
int c = 0;
u8 char_data = m_chargen[(m_mainram[rowaddr] << 4) | line];
for (int x = screen.visible_area().left(); x <= screen.visible_area().right(); x++)
{
if (x >= cliprect.left() && x <= cliprect.right())
bitmap.pix32(y, x) = BIT(char_data, 7) ? rgb_t::white() : rgb_t::black();
if (++c < char_width)
char_data = (char_data << 1) | (char_data & 1);
else
{
c = 0;
char_data = m_chargen[(m_mainram[++rowaddr] << 4) | line];
}
}
}
return 0;
}