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[NTVDM]

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Make our VGA DAC behave like the cirrus one: palette changes do not apply
until all 3 color components have been set.


svn path=/trunk/; revision=68602
This commit is contained in:
Aleksandar Andrejevic 2015-08-05 20:46:42 +00:00
parent 97b7898dfe
commit 702a0556a1
1 changed files with 35 additions and 16 deletions
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51
reactos/subsystems/mvdm/ntvdm/hardware/video/svga.c
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@ -275,6 +275,8 @@ static BYTE VgaAcIndex = VGA_AC_PAL_0_REG;
static BYTE VgaAcRegisters[VGA_AC_MAX_REG];
static BYTE VgaDacMask = 0xFF;
static BYTE VgaDacLatchCounter = 0;
static BYTE VgaDacLatch[3];
static BOOLEAN VgaDacReadWrite = FALSE;
static WORD VgaDacIndex = 0;
@ -1571,15 +1573,24 @@ static BYTE WINAPI VgaReadPort(USHORT Port)
return (VgaDacReadWrite ? 0 : 3);
case VGA_DAC_WRITE_INDEX:
return (VgaDacIndex / 3);
return VgaDacIndex;
case VGA_DAC_DATA:
{
/* Ignore reads in write mode */
if (!VgaDacReadWrite)
{
BYTE Data = VgaDacRegisters[VgaDacIndex++];
VgaDacIndex %= VGA_PALETTE_SIZE;
BYTE Data = VgaDacRegisters[VgaDacIndex * 3 + VgaDacLatchCounter];
VgaDacLatchCounter++;
if (VgaDacLatchCounter == 3)
{
/* Reset the latch counter and increment the palette index */
VgaDacLatchCounter = 0;
VgaDacIndex++;
VgaDacIndex %= VGA_MAX_COLORS;
}
return Data;
}
@ -1697,28 +1708,34 @@ static inline VOID VgaWriteCrtc(BYTE Data)
static inline VOID VgaWriteDac(BYTE Data)
{
UINT i, PaletteIndex;
UINT i;
PALETTEENTRY Entry;
/* Set the value */
VgaDacRegisters[VgaDacIndex] = Data;
/* Store the value in the latch */
VgaDacLatch[VgaDacLatchCounter++] = Data;
if (VgaDacLatchCounter < 3) return;
/* Find the palette index */
PaletteIndex = VgaDacIndex / 3;
/* Reset the latch counter */
VgaDacLatchCounter = 0;
/* Set the DAC register values */
VgaDacRegisters[VgaDacIndex * 3] = VgaDacLatch[0];
VgaDacRegisters[VgaDacIndex * 3 + 1] = VgaDacLatch[1];
VgaDacRegisters[VgaDacIndex * 3 + 2] = VgaDacLatch[2];
/* Fill the entry structure */
Entry.peRed = VGA_DAC_TO_COLOR(VgaDacRegisters[PaletteIndex * 3]);
Entry.peGreen = VGA_DAC_TO_COLOR(VgaDacRegisters[PaletteIndex * 3 + 1]);
Entry.peBlue = VGA_DAC_TO_COLOR(VgaDacRegisters[PaletteIndex * 3 + 2]);
Entry.peRed = VGA_DAC_TO_COLOR(VgaDacLatch[0]);
Entry.peGreen = VGA_DAC_TO_COLOR(VgaDacLatch[1]);
Entry.peBlue = VGA_DAC_TO_COLOR(VgaDacLatch[2]);
Entry.peFlags = 0;
/* Update the palette entry */
SetPaletteEntries(PaletteHandle, PaletteIndex, 1, &Entry);
SetPaletteEntries(PaletteHandle, VgaDacIndex, 1, &Entry);
/* Check which text palette entries are affected */
for (i = 0; i <= VGA_AC_PAL_F_REG; i++)
{
if (VgaAcRegisters[i] == PaletteIndex)
if (VgaAcRegisters[i] == VgaDacIndex)
{
/* Update the text palette entry */
SetPaletteEntries(TextPaletteHandle, i, 1, &Entry);
@ -1730,7 +1747,7 @@ static inline VOID VgaWriteDac(BYTE Data)
/* Update the index */
VgaDacIndex++;
VgaDacIndex %= VGA_PALETTE_SIZE;
VgaDacIndex %= VGA_MAX_COLORS;
}
static inline VOID VgaWriteAc(BYTE Data)
@ -1888,14 +1905,16 @@ static VOID WINAPI VgaWritePort(USHORT Port, BYTE Data)
case VGA_DAC_READ_INDEX:
{
VgaDacReadWrite = FALSE;
VgaDacIndex = Data * 3;
VgaDacIndex = Data;
VgaDacLatchCounter = 0;
break;
}
case VGA_DAC_WRITE_INDEX:
{
VgaDacReadWrite = TRUE;
VgaDacIndex = Data * 3;
VgaDacIndex = Data;
VgaDacLatchCounter = 0;
break;
}