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video/upd7220.cpp: backport pitch shift from pc9821 PEGC

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* fix pc9821:os2warp3 installation & chkdsk screens
This commit is contained in:
angelosa 2024-11-10 14:02:55 +01:00
parent 50e62d880f
commit 636ef26134
1 changed files with 5 additions and 2 deletions
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7
src/devices/video/upd7220.cpp
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@ -1852,6 +1852,9 @@ void upd7220_device::update_graphics(bitmap_rgb32 &bitmap, const rectangle &clip
LOGAREA("%s: AREA=%d BSY=%4d SAD=%06x len=%04x im=%d wd=%d\n", this->tag(), area, bsy, sad, len, im, wd);
// pc9821:aitd (256 color mode) and pc9821:os2warp3 (16, installation screens) wants this shift
const u8 pitch_shift = force_bitmap ? im : mixed;
if(im || force_bitmap)
{
// according to documentation only areas 0-1-2 can be drawn in bitmap mode
@ -1879,14 +1882,14 @@ void upd7220_device::update_graphics(bitmap_rgb32 &bitmap, const rectangle &clip
// pc98 quarth doesn't seem to use pitch here and it definitely wants bsy to be /2 to make scrolling to work.
// pc98 xevious wants the pitch to be fixed at 80, and wants bsy to be /1
// pc98 dbuster contradicts with Xevious with regards of the pitch tho ...
uint32_t const addr = (sad & 0x3ffff) + ((y / (mixed ? 1 : m_lr)) * (m_pitch >> mixed));
uint32_t const addr = (sad & 0x3ffff) + ((y / (mixed ? 1 : m_lr)) * (m_pitch >> pitch_shift));
for(int z = 0; z <= m_disp; ++z)
{
int yval = (y*zoom)+z + (bsy + m_vbp);
// pc9801:duel sets up bitmap layer with height 384 vs. 400 of text layer
// so we scissor here, interlace wants it bumped x2 (microbx2)
if(yval <= cliprect.bottom() && (yval - m_vbp) < m_al << interlace)
draw_graphics_line(bitmap, addr, yval, wd, mixed);
draw_graphics_line(bitmap, addr, yval, wd, pitch_shift);
}
}
}