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[NTVDM]

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Implement panning by moving the addressing coordinates up instead
of moving the display coordinates down.


svn path=/trunk/; revision=67942
This commit is contained in:
Aleksandar Andrejevic 2015-05-28 15:45:40 +00:00
parent 64f488b5d7
commit 1371cf3d00
1 changed files with 42 additions and 48 deletions
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90
reactos/subsystems/mvdm/ntvdm/hardware/video/vga.c
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@ -1063,6 +1063,7 @@ static VOID VgaUpdateFramebuffer(VOID)
BYTE PresetRowScan = VgaCrtcRegisters[VGA_CRTC_PRESET_ROW_SCAN_REG] & 0x1F;
DWORD Address = MAKEWORD(VgaCrtcRegisters[VGA_CRTC_START_ADDR_LOW_REG],
VgaCrtcRegisters[VGA_CRTC_START_ADDR_HIGH_REG])
+ PresetRowScan * ScanlineSize
+ ((VgaCrtcRegisters[VGA_CRTC_PRESET_ROW_SCAN_REG] >> 5) & 3);
/*
@ -1077,7 +1078,7 @@ static VOID VgaUpdateFramebuffer(VOID)
/* Graphics mode */
PBYTE GraphicsBuffer = (PBYTE)ConsoleFramebuffer;
DWORD InterlaceHighBit = VGA_INTERLACE_HIGH_BIT;
SHORT X, Y;
SHORT X;
/*
* Synchronize access to the graphics framebuffer
@ -1100,15 +1101,21 @@ static VOID VgaUpdateFramebuffer(VOID)
Address |= InterlaceHighBit;
}
/* Apply the preset row scan */
Y = i - PresetRowScan;
if (Y < 0) Y += CurrResolution.Y;
/* Loop through the pixels */
for (j = 0; j < CurrResolution.X; j++)
{
BYTE PixelData = 0;
/* Apply horizontal pixel panning */
if (VgaAcRegisters[VGA_AC_CONTROL_REG] & VGA_AC_CONTROL_8BIT)
{
X = j + ((VgaAcRegisters[VGA_AC_HORZ_PANNING_REG] & 0x0F) >> 1);
}
else
{
X = j + (VgaAcRegisters[VGA_AC_HORZ_PANNING_REG] & 0x0F);
}
/* Check the shifting mode */
if (VgaGcRegisters[VGA_GC_MODE_REG] & VGA_GC_MODE_SHIFT256)
{
@ -1118,20 +1125,20 @@ static VOID VgaUpdateFramebuffer(VOID)
if (VgaAcRegisters[VGA_AC_CONTROL_REG] & VGA_AC_CONTROL_8BIT)
{
/* One byte per pixel */
PixelData = VgaMemory[(j % VGA_NUM_BANKS) * VGA_BANK_SIZE
+ LOWORD((Address + (j / VGA_NUM_BANKS))
PixelData = VgaMemory[(X % VGA_NUM_BANKS) * VGA_BANK_SIZE
+ LOWORD((Address + (X / VGA_NUM_BANKS))
* AddressSize)];
}
else
{
/* 4-bits per pixel */
PixelData = VgaMemory[(j % VGA_NUM_BANKS) * VGA_BANK_SIZE
+ LOWORD((Address + (j / (VGA_NUM_BANKS * 2)))
PixelData = VgaMemory[(X % VGA_NUM_BANKS) * VGA_BANK_SIZE
+ LOWORD((Address + (X / (VGA_NUM_BANKS * 2)))
* AddressSize)];
/* Check if we should use the highest 4 bits or lowest 4 */
if (((j / VGA_NUM_BANKS) % 2) == 0)
if (((X / VGA_NUM_BANKS) % 2) == 0)
{
/* Highest 4 */
PixelData >>= 4;
@ -1157,14 +1164,14 @@ static VOID VgaUpdateFramebuffer(VOID)
* 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
*/
DWORD BankNumber = (j / 4) % 2;
DWORD Offset = Address + (j / 8);
DWORD BankNumber = (X / 4) % 2;
DWORD Offset = Address + (X / 8);
BYTE LowPlaneData = VgaMemory[BankNumber * VGA_BANK_SIZE + LOWORD(Offset * AddressSize)];
BYTE HighPlaneData = VgaMemory[(BankNumber + 2) * VGA_BANK_SIZE + LOWORD(Offset * AddressSize)];
/* Extract the two bits from each plane */
LowPlaneData = (LowPlaneData >> (6 - ((j % 4) * 2))) & 0x03;
HighPlaneData = (HighPlaneData >> (6 - ((j % 4) * 2))) & 0x03;
LowPlaneData = (LowPlaneData >> (6 - ((X % 4) * 2))) & 0x03;
HighPlaneData = (HighPlaneData >> (6 - ((X % 4) * 2))) & 0x03;
/* Combine them into the pixel */
PixelData = LowPlaneData | (HighPlaneData << 2);
@ -1183,11 +1190,11 @@ static VOID VgaUpdateFramebuffer(VOID)
{
/* The data is on plane k, 4 pixels per byte */
BYTE PlaneData = VgaMemory[k * VGA_BANK_SIZE
+ LOWORD((Address + (j / VGA_NUM_BANKS))
+ LOWORD((Address + (X / VGA_NUM_BANKS))
* AddressSize)];
/* The mask of the first bit in the pair */
BYTE BitMask = 1 << (((3 - (j % VGA_NUM_BANKS)) * 2) + 1);
BYTE BitMask = 1 << (((3 - (X % VGA_NUM_BANKS)) * 2) + 1);
/* Bits 0, 1, 2 and 3 come from the first bit of the pair */
if (PlaneData & BitMask) PixelData |= 1 << k;
@ -1203,11 +1210,11 @@ static VOID VgaUpdateFramebuffer(VOID)
for (k = 0; k < VGA_NUM_BANKS; k++)
{
BYTE PlaneData = VgaMemory[k * VGA_BANK_SIZE
+ LOWORD((Address + (j / (VGA_NUM_BANKS * 2)))
+ LOWORD((Address + (X / (VGA_NUM_BANKS * 2)))
* AddressSize)];
/* If the bit on that plane is set, set it */
if (PlaneData & (1 << (7 - (j % 8)))) PixelData |= 1 << k;
if (PlaneData & (1 << (7 - (X % 8)))) PixelData |= 1 << k;
}
}
}
@ -1223,71 +1230,58 @@ static VOID VgaUpdateFramebuffer(VOID)
: 0);
}
/* Apply horizontal pixel panning */
if (VgaAcRegisters[VGA_AC_CONTROL_REG] & VGA_AC_CONTROL_8BIT)
{
X = j - ((VgaAcRegisters[VGA_AC_HORZ_PANNING_REG] & 0x0F) >> 1);
}
else
{
X = j - (VgaAcRegisters[VGA_AC_HORZ_PANNING_REG] & 0x0F);
}
/* Wrap around */
if (X < 0) X += CurrResolution.X;
/* Take into account DoubleVision mode when checking for pixel updates */
if (DoubleWidth && DoubleHeight)
{
/* Now check if the resulting pixel data has changed */
if (GraphicsBuffer[(Y * 2 * CurrResolution.X * 2) + (X * 2)] != PixelData)
if (GraphicsBuffer[(i * 2 * CurrResolution.X * 2) + (j * 2)] != PixelData)
{
/* Yes, write the new value */
GraphicsBuffer[(Y * 2 * CurrResolution.X * 2) + (X * 2)] = PixelData;
GraphicsBuffer[(Y * 2 * CurrResolution.X * 2) + (X * 2 + 1)] = PixelData;
GraphicsBuffer[((Y * 2 + 1) * CurrResolution.X * 2) + (X * 2)] = PixelData;
GraphicsBuffer[((Y * 2 + 1) * CurrResolution.X * 2) + (X * 2 + 1)] = PixelData;
GraphicsBuffer[(i * 2 * CurrResolution.X * 2) + (j * 2)] = PixelData;
GraphicsBuffer[(i * 2 * CurrResolution.X * 2) + (j * 2 + 1)] = PixelData;
GraphicsBuffer[((i * 2 + 1) * CurrResolution.X * 2) + (j * 2)] = PixelData;
GraphicsBuffer[((i * 2 + 1) * CurrResolution.X * 2) + (j * 2 + 1)] = PixelData;
/* Mark the specified pixel as changed */
VgaMarkForUpdate(Y, X);
VgaMarkForUpdate(i, j);
}
}
else if (DoubleWidth && !DoubleHeight)
{
/* Now check if the resulting pixel data has changed */
if (GraphicsBuffer[(Y * CurrResolution.X * 2) + (X * 2)] != PixelData)
if (GraphicsBuffer[(i * CurrResolution.X * 2) + (j * 2)] != PixelData)
{
/* Yes, write the new value */
GraphicsBuffer[(Y * CurrResolution.X * 2) + (X * 2)] = PixelData;
GraphicsBuffer[(Y * CurrResolution.X * 2) + (X * 2 + 1)] = PixelData;
GraphicsBuffer[(i * CurrResolution.X * 2) + (j * 2)] = PixelData;
GraphicsBuffer[(i * CurrResolution.X * 2) + (j * 2 + 1)] = PixelData;
/* Mark the specified pixel as changed */
VgaMarkForUpdate(Y, X);
VgaMarkForUpdate(i, j);
}
}
else if (!DoubleWidth && DoubleHeight)
{
/* Now check if the resulting pixel data has changed */
if (GraphicsBuffer[(Y * 2 * CurrResolution.X) + X] != PixelData)
if (GraphicsBuffer[(i * 2 * CurrResolution.X) + j] != PixelData)
{
/* Yes, write the new value */
GraphicsBuffer[(Y * 2 * CurrResolution.X) + X] = PixelData;
GraphicsBuffer[((Y * 2 + 1) * CurrResolution.X) + X] = PixelData;
GraphicsBuffer[(i * 2 * CurrResolution.X) + j] = PixelData;
GraphicsBuffer[((i * 2 + 1) * CurrResolution.X) + j] = PixelData;
/* Mark the specified pixel as changed */
VgaMarkForUpdate(Y, X);
VgaMarkForUpdate(i, j);
}
}
else // if (!DoubleWidth && !DoubleHeight)
{
/* Now check if the resulting pixel data has changed */
if (GraphicsBuffer[Y * CurrResolution.X + X] != PixelData)
if (GraphicsBuffer[i * CurrResolution.X + j] != PixelData)
{
/* Yes, write the new value */
GraphicsBuffer[Y * CurrResolution.X + X] = PixelData;
GraphicsBuffer[i * CurrResolution.X + j] = PixelData;
/* Mark the specified pixel as changed */
VgaMarkForUpdate(Y, X);
VgaMarkForUpdate(i, j);
}
}
}