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[NTVDM]

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Fix 16 color modes.
Implement 4-bit interleaved shift mode.


svn path=/branches/ntvdm/; revision=59738
This commit is contained in:
Aleksandar Andrejevic 2013-08-14 17:17:43 +00:00
parent 05b8a9a86c
commit 516653f447
1 changed files with 29 additions and 6 deletions
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35
subsystems/ntvdm/vga.c
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@ -572,13 +572,30 @@ static VOID VgaUpdateFramebuffer(VOID)
}
else if (VgaGcRegisters[VGA_GC_MODE_REG] & VGA_GC_MODE_SHIFTREG)
{
/*
* 2 bits shifted from plane 0 and 2 for the first 4 pixels,
* then 2 bits shifted from plane 1 and 3 for the next 4
*/
/* Check if this is 16 or 256 color mode */
if (VgaAcRegisters[VGA_AC_CONTROL_REG] & VGA_AC_CONTROL_8BIT)
{
/*
* 2 bits shifted from plane 0 and 2 for the first 4 pixels,
* then 2 bits shifted from plane 1 and 3 for the next 4
*/
BYTE LowPlaneData = VgaMemory[((j / 4) % 2) * VGA_BANK_SIZE
+ (Address + (j / 4)) * AddressSize];
BYTE HighPlaneData = VgaMemory[(((j / 4) % 2) + 1) * VGA_BANK_SIZE
+ (Address + (j / 4)) * AddressSize];
// TODO: NOT IMPLEMENTED!
DPRINT1("Interleaved shift mode is not implemented!\n");
/* Extract the two bits from each plane */
LowPlaneData = (LowPlaneData >> (6 - ((j % 4) * 2))) & 3;
HighPlaneData = (HighPlaneData >> (6 - ((j % 4) * 2))) & 3;
/* Combine them into the pixel */
PixelData = LowPlaneData | (HighPlaneData << 2);
}
else
{
// TODO: NOT IMPLEMENTED
DPRINT1("8-bit interleaved mode is not implemented!\n");
}
}
else
{
@ -620,6 +637,12 @@ static VOID VgaUpdateFramebuffer(VOID)
}
}
if (!(VgaAcRegisters[VGA_AC_CONTROL_REG] & VGA_AC_CONTROL_8BIT))
{
/* In 16 color mode, the value is an index to the AC registers */
PixelData = VgaAcRegisters[PixelData];
}
/* Now check if the resulting pixel data has changed */
if (GraphicsBuffer[i * Resolution.X + j] != PixelData)
{