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(MESS)g7400: First attempt at mixing video signals. (nw)

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This commit is contained in:
Wilbert Pol 2013-01-13 20:05:40 +00:00
parent a95242d9e9
commit 308c451eec
1 changed files with 21 additions and 1 deletions
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22
src/mess/drivers/odyssey2.c
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@ -436,15 +436,35 @@ WRITE16_MEMBER(odyssey2_state::scanline_postprocess)
WRITE16_MEMBER(odyssey2_state::scanline_postprocess_g7400)
{
int vpos = data;
int y = vpos - i8244_device::START_Y;
bitmap_ind16 *bitmap = m_i8244->get_bitmap();
bitmap_ind16 *ef934x_bitmap = m_ef9340_1->get_bitmap();
// apply external LUM setting
for ( int x = i8244_device::START_ACTIVE_SCAN; x < i8244_device::END_ACTIVE_SCAN; x++ )
{
bitmap->pix16( vpos, x ) |= ( m_lum ^ 0x08 );
UINT16 d = bitmap->pix16( vpos, x );
if ( ! m_g7400_ic678_decode[ d & 0x07 ] )
{
// Use EF934x input
d = ef934x_bitmap->pix16( y, x - i8244_device::START_ACTIVE_SCAN ) & 0x07;
if ( ! m_g7400_ic674_decode[ d & 0x07 ] )
{
d |= 0x08;
}
}
else
{
// Use i8245 input
d |= ( m_lum ^ 0x08 );
}
bitmap->pix16( vpos, x ) = d;
}
}
UINT32 odyssey2_state::screen_update_odyssey2(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
return m_i8244->screen_update(screen, bitmap, cliprect);