[aandrejevic] 67746: [NTVDM] Reverse the HSYNC/VSYNC polarity when it should be reversed.

Author: aandrejevic
Date: Fri May 15 19:51:40 2015
New Revision: 67746

URL: http://svn.reactos.org/svn/reactos?rev=67746&view=rev
Log:
[NTVDM]
Reverse the HSYNC/VSYNC polarity when it should be reversed.

Modified:
    trunk/reactos/subsystems/mvdm/ntvdm/hardware/video/vga.c

Modified: trunk/reactos/subsystems/mvdm/ntvdm/hardware/video/vga.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/mvdm/ntvdm/hardw...
==============================================================================
--- trunk/reactos/subsystems/mvdm/ntvdm/hardware/video/vga.c	[iso-8859-1] (original)
+++ trunk/reactos/subsystems/mvdm/ntvdm/hardware/video/vga.c	[iso-8859-1] Fri May 15 19:51:40 2015
@@ -1393,15 +1393,21 @@
         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;