From 1c9756782c21f5dd14435efe1b792b96c7a6e8c8 Mon Sep 17 00:00:00 2001
From: Aleksandar Andrejevic <aandrejevic@reactos.org>
Date: Sat, 7 Dec 2013 03:47:58 +0000
Subject: [PATCH] [NTVDM] Use the EGA palette for EGA modes.

svn path=/branches/ntvdm/; revision=61242
---
 subsystems/ntvdm/bios.c | 46 +++++++++++++++++++++++++++++++++++------
 1 file changed, 40 insertions(+), 6 deletions(-)

diff --git a/subsystems/ntvdm/bios.c b/subsystems/ntvdm/bios.c
index 9670caf6824..1a9fd081e91 100644
--- a/subsystems/ntvdm/bios.c
+++ b/subsystems/ntvdm/bios.c
@@ -134,8 +134,8 @@ static BYTE VideoMode_320x200_16color[] =
     0xFF,
 
     /* AC Registers */
-    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x10, 0x11, 0x12, 0x13,
-    0x14, 0x15, 0x16, 0x17, 0x01, 0x00, 0x0F, 0x00, 0x00
+    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x14, 0x07, 0x38, 0x39, 0x3A, 0x3B,
+    0x3C, 0x3D, 0x3E, 0x3F, 0x01, 0x00, 0x0F, 0x00, 0x00
 };
 
 static BYTE VideoMode_640x200_16color[] =
@@ -155,8 +155,8 @@ static BYTE VideoMode_640x200_16color[] =
     0xFF,
 
     /* AC Registers */
-    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x10, 0x11, 0x12, 0x13,
-    0x14, 0x15, 0x16, 0x17, 0x01, 0x00, 0x0F, 0x00, 0x00
+    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x14, 0x07, 0x38, 0x39, 0x3A, 0x3B,
+    0x3C, 0x3D, 0x3E, 0x3F, 0x01, 0x00, 0x0F, 0x00, 0x00
 };
 
 static BYTE VideoMode_640x350_16color[] =
@@ -267,6 +267,26 @@ static LPBYTE VideoModes[] =
     VideoMode_320x200_256color, /* Mode 13h */
 };
 
+static CONST COLORREF EgaPalette[VGA_MAX_COLORS / 4] =
+{
+    RGB(0x00, 0x00, 0x00), RGB(0x00, 0x00, 0xAA), RGB(0x00, 0xAA, 0x00), RGB(0x00, 0xAA, 0xAA),
+    RGB(0xAA, 0x00, 0x00), RGB(0xAA, 0x00, 0xAA), RGB(0xAA, 0xAA, 0x00), RGB(0xAA, 0xAA, 0xAA),
+    RGB(0x00, 0x00, 0x55), RGB(0x00, 0x00, 0xFF), RGB(0x00, 0xAA, 0x55), RGB(0x00, 0xAA, 0xFF),
+    RGB(0xAA, 0x00, 0x55), RGB(0xAA, 0x00, 0xFF), RGB(0xAA, 0xAA, 0x55), RGB(0xAA, 0xAA, 0xFF),
+    RGB(0x00, 0x55, 0x00), RGB(0x00, 0x55, 0xAA), RGB(0x00, 0xFF, 0x00), RGB(0x00, 0xFF, 0xAA),
+    RGB(0xAA, 0x55, 0x00), RGB(0xAA, 0x55, 0xAA), RGB(0xAA, 0xFF, 0x00), RGB(0xAA, 0xFF, 0xAA),
+    RGB(0x00, 0x55, 0x55), RGB(0x00, 0x55, 0xFF), RGB(0x00, 0xFF, 0x55), RGB(0x00, 0xFF, 0xFF),
+    RGB(0xAA, 0x55, 0x55), RGB(0xAA, 0x55, 0xFF), RGB(0xAA, 0xFF, 0x55), RGB(0xAA, 0xFF, 0xFF),
+    RGB(0x55, 0x00, 0x00), RGB(0x55, 0x00, 0xAA), RGB(0x55, 0xAA, 0x00), RGB(0x55, 0xAA, 0xAA),
+    RGB(0xFF, 0x00, 0x00), RGB(0xFF, 0x00, 0xAA), RGB(0xFF, 0xAA, 0x00), RGB(0xFF, 0xAA, 0xAA),
+    RGB(0x55, 0x00, 0x55), RGB(0x55, 0x00, 0xFF), RGB(0x55, 0xAA, 0x55), RGB(0x55, 0xAA, 0xFF),
+    RGB(0xFF, 0x00, 0x55), RGB(0xFF, 0x00, 0xFF), RGB(0xFF, 0xAA, 0x55), RGB(0xFF, 0xAA, 0xFF),
+    RGB(0x55, 0x55, 0x00), RGB(0x55, 0x55, 0xAA), RGB(0x55, 0xFF, 0x00), RGB(0x55, 0xFF, 0xAA),
+    RGB(0xFF, 0x55, 0x00), RGB(0xFF, 0x55, 0xAA), RGB(0xFF, 0xFF, 0x00), RGB(0xFF, 0xFF, 0xAA),
+    RGB(0x55, 0x55, 0x55), RGB(0x55, 0x55, 0xFF), RGB(0x55, 0xFF, 0x55), RGB(0x55, 0xFF, 0xFF),
+    RGB(0xFF, 0x55, 0x55), RGB(0xFF, 0x55, 0xFF), RGB(0xFF, 0xFF, 0x55), RGB(0xFF, 0xFF, 0xFF)
+};
+
 /* PRIVATE FUNCTIONS **********************************************************/
 
 static BOOLEAN BiosKbdBufferPush(WORD Data)
@@ -416,8 +436,22 @@ BOOLEAN BiosSetVideoMode(BYTE ModeNumber)
         VgaWritePort(VGA_AC_WRITE, *(Values++));
     }
 
-    /* Reset the palette */
-    VgaResetPalette();
+    if ((ModeNumber == 0x0D) || (ModeNumber == 0x0E) || (ModeNumber == 0x10))
+    {
+        /* EGA modes */
+        for (i = 0; i < VGA_MAX_COLORS / 4; i++)
+        {
+            VgaWritePort(VGA_DAC_WRITE_INDEX, i);
+            VgaWritePort(VGA_DAC_DATA, VGA_COLOR_TO_DAC(GetRValue(EgaPalette[i])));
+            VgaWritePort(VGA_DAC_DATA, VGA_COLOR_TO_DAC(GetGValue(EgaPalette[i])));
+            VgaWritePort(VGA_DAC_DATA, VGA_COLOR_TO_DAC(GetBValue(EgaPalette[i])));
+        }
+    }
+    else
+    {
+        /* Reset the palette */
+        VgaResetPalette();
+    }
 
     /* Update the values in the BDA */
     Bda->VideoMode = ModeNumber;
-- 
2.17.1