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[NTVDM]
Fix CGA emulation in shift interleave mode. CORE-8177 #comment Possibly fixed. Can you redo your tests with r63199? svn path=/trunk/; revision=63199
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@ -1146,6 +1146,8 @@ static VOID VgaUpdateFramebuffer(VOID)
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/* Loop through the scanlines */
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for (i = 0; i < Resolution.Y; i++)
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{
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BOOL RepeatScanline = FALSE;
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/* Loop through the pixels */
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for (j = 0; j < Resolution.X; j++)
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{
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@ -1199,10 +1201,23 @@ static VOID VgaUpdateFramebuffer(VOID)
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* 2 bits shifted from plane 0 and 2 for the first 4 pixels,
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* then 2 bits shifted from plane 1 and 3 for the next 4
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*/
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BYTE LowPlaneData = VgaMemory[((j / 4) % 2) * VGA_BANK_SIZE
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+ (Address + (j / 8)) * AddressSize];
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BYTE HighPlaneData = VgaMemory[(((j / 4) % 2) + 2) * VGA_BANK_SIZE
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+ (Address + (j / 8)) * AddressSize];
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DWORD BankNumber = (j / 4) % 2;
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DWORD Offset = Address + (j / 8);
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BYTE LowPlaneData, HighPlaneData;
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if (i % 2 == 0)
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{
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/* Odd-numbered line - add the CGA emulation offset */
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Offset += VGA_CGA_ODD_LINE_OFFSET;
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}
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else
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{
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/* Even-numbered line - use the same scanline */
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RepeatScanline = TRUE;
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}
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LowPlaneData = VgaMemory[BankNumber * VGA_BANK_SIZE + Offset * AddressSize];
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HighPlaneData = VgaMemory[(BankNumber + 2) * VGA_BANK_SIZE + Offset * AddressSize];
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/* Extract the two bits from each plane */
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LowPlaneData = (LowPlaneData >> (6 - ((j % 4) * 2))) & 3;
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@ -1296,7 +1311,7 @@ static VOID VgaUpdateFramebuffer(VOID)
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}
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/* Move to the next scanline */
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Address += ScanlineSize;
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if (!RepeatScanline) Address += ScanlineSize;
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}
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/*
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@ -24,7 +24,7 @@
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#define VGA_MINIMUM_HEIGHT 300
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#define VGA_DAC_TO_COLOR(x) (((x) << 2) | ((x) >> 4))
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#define VGA_COLOR_TO_DAC(x) ((x) >> 2)
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#define VGA_CGA_ODD_LINE_OFFSET 0x1000
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/* Register I/O ports */
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