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[NTVDM]

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Reverse the HSYNC/VSYNC polarity when it should be reversed.


svn path=/trunk/; revision=67746
This commit is contained in:
Aleksandar Andrejevic 2015-05-15 19:51:40 +00:00
parent 9b1cceafb1
commit 08ec785c24
1 changed files with 8 additions and 2 deletions
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10
reactos/subsystems/mvdm/ntvdm/hardware/video/vga.c
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@ -1393,15 +1393,21 @@ static BYTE WINAPI VgaReadPort(USHORT Port)
case VGA_INSTAT1_READ_COLOR:
{
BYTE Result = 0;
BOOLEAN Vsync = InVerticalRetrace;
BOOLEAN Hsync = InHorizontalRetrace;
/* Reset the AC latch */
VgaAcLatch = FALSE;
/* Reverse the polarity, if needed */
if (VgaMiscRegister & VGA_MISC_VSYNCP) Vsync = !Vsync;
if (VgaMiscRegister & VGA_MISC_HSYNCP) Hsync = !Hsync;
/* Set a flag if there is a vertical or horizontal retrace */
if (InVerticalRetrace || InHorizontalRetrace) Result |= VGA_STAT_DD;
if (Vsync || Hsync) Result |= VGA_STAT_DD;
/* Set an additional flag if there was a vertical retrace */
if (InVerticalRetrace) Result |= VGA_STAT_VRETRACE;
if (Vsync) Result |= VGA_STAT_VRETRACE;
/* Clear the flags */
InHorizontalRetrace = InVerticalRetrace = FALSE;