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fmtowns: fixed 16-bit color scrolling a bit more

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After further testing, it seems Vain Dream uses the horizontal adjust registers in 16-bit color mode for a small part of the intro, and PR #2881 made it slightly worse. This should make both it and psydet5 display correctly.
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r09 2017-12-04 23:08:25 +01:00 committed by GitHub
parent 4081eac990
commit b39a95ba8f
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1 changed files with 2 additions and 2 deletions
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src/mame/video/fmtowns.cpp
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@ -959,7 +959,7 @@ void towns_state::towns_crtc_draw_scan_layer_hicolour(bitmap_rgb32 &bitmap,const
off += scroll;
}
hzoom = ((m_video.towns_crtc_reg[27] & 0x0f00) >> 8) + 1;
off += (m_video.towns_crtc_reg[11] - m_video.towns_crtc_reg[22]) * (hzoom * 2);
off += (m_video.towns_crtc_reg[11] - m_video.towns_crtc_reg[22]) * (2 >> (hzoom - 1));
}
else
{
@ -971,7 +971,7 @@ void towns_state::towns_crtc_draw_scan_layer_hicolour(bitmap_rgb32 &bitmap,const
off += scroll;
}
hzoom = (m_video.towns_crtc_reg[27] & 0x000f) + 1;
off += (m_video.towns_crtc_reg[9] - m_video.towns_crtc_reg[18]) * (hzoom * 2);
off += (m_video.towns_crtc_reg[9] - m_video.towns_crtc_reg[18]) * (2 >> (hzoom - 1));
}
off += line * linesize;