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reactos/subsystems/ntvdm/vga.c
Aleksandar Andrejevic 0043c2f377 [NTVDM] 
Properly handle the case when the console framebuffer could not be created.


svn path=/branches/ntvdm/; revision=60526
2013-10-04 21:16:58 +00:00

1269 lines
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/*
* COPYRIGHT: GPL - See COPYING in the top level directory
* PROJECT: ReactOS Virtual DOS Machine
* FILE: vga.c
* PURPOSE: VGA hardware emulation
* PROGRAMMERS: Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
*/
/* INCLUDES *******************************************************************/
#define NDEBUG
#include "vga.h"
#include "bios.h"
/* PRIVATE VARIABLES **********************************************************/
static CONST DWORD MemoryBase[] = { 0xA0000, 0xA0000, 0xB0000, 0xB8000 };
static CONST DWORD MemoryLimit[] = { 0xAFFFF, 0xAFFFF, 0xB7FFF, 0xBFFFF };
static CONST COLORREF VgaDefaultPalette[VGA_MAX_COLORS] =
{
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, 0x55, 0x00), RGB(0xAA, 0xAA, 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),
RGB(0x00, 0x00, 0x00), RGB(0x10, 0x10, 0x10), RGB(0x20, 0x20, 0x20), RGB(0x35, 0x35, 0x35),
RGB(0x45, 0x45, 0x45), RGB(0x55, 0x55, 0x55), RGB(0x65, 0x65, 0x65), RGB(0x75, 0x75, 0x75),
RGB(0x8A, 0x8A, 0x8A), RGB(0x9A, 0x9A, 0x9A), RGB(0xAA, 0xAA, 0xAA), RGB(0xBA, 0xBA, 0xBA),
RGB(0xCA, 0xCA, 0xCA), RGB(0xDF, 0xDF, 0xDF), RGB(0xEF, 0xEF, 0xEF), RGB(0xFF, 0xFF, 0xFF),
RGB(0x00, 0x00, 0xFF), RGB(0x41, 0x00, 0xFF), RGB(0x82, 0x00, 0xFF), RGB(0xBE, 0x00, 0xFF),
RGB(0xFF, 0x00, 0xFF), RGB(0xFF, 0x00, 0xBE), RGB(0xFF, 0x00, 0x82), RGB(0xFF, 0x00, 0x41),
RGB(0xFF, 0x00, 0x00), RGB(0xFF, 0x41, 0x00), RGB(0xFF, 0x82, 0x00), RGB(0xFF, 0xBE, 0x00),
RGB(0xFF, 0xFF, 0x00), RGB(0xBE, 0xFF, 0x00), RGB(0x82, 0xFF, 0x00), RGB(0x41, 0xFF, 0x00),
RGB(0x00, 0xFF, 0x00), RGB(0x00, 0xFF, 0x41), RGB(0x00, 0xFF, 0x82), RGB(0x00, 0xFF, 0xBE),
RGB(0x00, 0xFF, 0xFF), RGB(0x00, 0xBE, 0xFF), RGB(0x00, 0x82, 0xFF), RGB(0x00, 0x41, 0xFF),
RGB(0x82, 0x82, 0xFF), RGB(0x9E, 0x82, 0xFF), RGB(0xBE, 0x82, 0xFF), RGB(0xDF, 0x82, 0xFF),
RGB(0xFF, 0x82, 0xFF), RGB(0xFF, 0x82, 0xDF), RGB(0xFF, 0x82, 0xBE), RGB(0xFF, 0x82, 0x9E),
RGB(0xFF, 0x82, 0x82), RGB(0xFF, 0x9E, 0x82), RGB(0xFF, 0xBE, 0x82), RGB(0xFF, 0xDF, 0x82),
RGB(0xFF, 0xFF, 0x82), RGB(0xDF, 0xFF, 0x82), RGB(0xBE, 0xFF, 0x82), RGB(0x9E, 0xFF, 0x82),
RGB(0x82, 0xFF, 0x82), RGB(0x82, 0xFF, 0x9E), RGB(0x82, 0xFF, 0xBE), RGB(0x82, 0xFF, 0xDF),
RGB(0x82, 0xFF, 0xFF), RGB(0x82, 0xDF, 0xFF), RGB(0x82, 0xBE, 0xFF), RGB(0x82, 0x9E, 0xFF),
RGB(0xBA, 0xBA, 0xFF), RGB(0xCA, 0xBA, 0xFF), RGB(0xDF, 0xBA, 0xFF), RGB(0xEF, 0xBA, 0xFF),
RGB(0xFF, 0xBA, 0xFF), RGB(0xFF, 0xBA, 0xEF), RGB(0xFF, 0xBA, 0xDF), RGB(0xFF, 0xBA, 0xCA),
RGB(0xFF, 0xBA, 0xBA), RGB(0xFF, 0xCA, 0xBA), RGB(0xFF, 0xDF, 0xBA), RGB(0xFF, 0xEF, 0xBA),
RGB(0xFF, 0xFF, 0xBA), RGB(0xEF, 0xFF, 0xBA), RGB(0xDF, 0xFF, 0xBA), RGB(0xCA, 0xFF, 0xBA),
RGB(0xBA, 0xFF, 0xBA), RGB(0xBA, 0xFF, 0xCA), RGB(0xBA, 0xFF, 0xDF), RGB(0xBA, 0xFF, 0xEF),
RGB(0xBA, 0xFF, 0xFF), RGB(0xBA, 0xEF, 0xFF), RGB(0xBA, 0xDF, 0xFF), RGB(0xBA, 0xCA, 0xFF),
RGB(0x00, 0x00, 0x71), RGB(0x1C, 0x00, 0x71), RGB(0x39, 0x00, 0x71), RGB(0x55, 0x00, 0x71),
RGB(0x71, 0x00, 0x71), RGB(0x71, 0x00, 0x55), RGB(0x71, 0x00, 0x39), RGB(0x71, 0x00, 0x1C),
RGB(0x71, 0x00, 0x00), RGB(0x71, 0x1C, 0x00), RGB(0x71, 0x39, 0x00), RGB(0x71, 0x55, 0x00),
RGB(0x71, 0x71, 0x00), RGB(0x55, 0x71, 0x00), RGB(0x39, 0x71, 0x00), RGB(0x1C, 0x71, 0x00),
RGB(0x00, 0x71, 0x00), RGB(0x00, 0x71, 0x1C), RGB(0x00, 0x71, 0x39), RGB(0x00, 0x71, 0x55),
RGB(0x00, 0x71, 0x71), RGB(0x00, 0x55, 0x71), RGB(0x00, 0x39, 0x71), RGB(0x00, 0x1C, 0x71),
RGB(0x39, 0x39, 0x71), RGB(0x45, 0x39, 0x71), RGB(0x55, 0x39, 0x71), RGB(0x61, 0x39, 0x71),
RGB(0x71, 0x39, 0x71), RGB(0x71, 0x39, 0x61), RGB(0x71, 0x39, 0x55), RGB(0x71, 0x39, 0x45),
RGB(0x71, 0x39, 0x39), RGB(0x71, 0x45, 0x39), RGB(0x71, 0x55, 0x39), RGB(0x71, 0x61, 0x39),
RGB(0x71, 0x71, 0x39), RGB(0x61, 0x71, 0x39), RGB(0x55, 0x71, 0x39), RGB(0x45, 0x71, 0x39),
RGB(0x39, 0x71, 0x39), RGB(0x39, 0x71, 0x45), RGB(0x39, 0x71, 0x55), RGB(0x39, 0x71, 0x61),
RGB(0x39, 0x71, 0x71), RGB(0x39, 0x61, 0x71), RGB(0x39, 0x55, 0x71), RGB(0x39, 0x45, 0x71),
RGB(0x51, 0x51, 0x71), RGB(0x59, 0x51, 0x71), RGB(0x61, 0x51, 0x71), RGB(0x69, 0x51, 0x71),
RGB(0x71, 0x51, 0x71), RGB(0x71, 0x51, 0x69), RGB(0x71, 0x51, 0x61), RGB(0x71, 0x51, 0x59),
RGB(0x71, 0x51, 0x51), RGB(0x71, 0x59, 0x51), RGB(0x71, 0x61, 0x51), RGB(0x71, 0x69, 0x51),
RGB(0x71, 0x71, 0x51), RGB(0x69, 0x71, 0x51), RGB(0x61, 0x71, 0x51), RGB(0x59, 0x71, 0x51),
RGB(0x51, 0x71, 0x51), RGB(0x51, 0x71, 0x59), RGB(0x51, 0x71, 0x61), RGB(0x51, 0x71, 0x69),
RGB(0x51, 0x71, 0x71), RGB(0x51, 0x69, 0x71), RGB(0x51, 0x61, 0x71), RGB(0x51, 0x59, 0x71),
RGB(0x00, 0x00, 0x41), RGB(0x10, 0x00, 0x41), RGB(0x20, 0x00, 0x41), RGB(0x31, 0x00, 0x41),
RGB(0x41, 0x00, 0x41), RGB(0x41, 0x00, 0x31), RGB(0x41, 0x00, 0x20), RGB(0x41, 0x00, 0x10),
RGB(0x41, 0x00, 0x00), RGB(0x41, 0x10, 0x00), RGB(0x41, 0x20, 0x00), RGB(0x41, 0x31, 0x00),
RGB(0x41, 0x41, 0x00), RGB(0x31, 0x41, 0x00), RGB(0x20, 0x41, 0x00), RGB(0x10, 0x41, 0x00),
RGB(0x00, 0x41, 0x00), RGB(0x00, 0x41, 0x10), RGB(0x00, 0x41, 0x20), RGB(0x00, 0x41, 0x31),
RGB(0x00, 0x41, 0x41), RGB(0x00, 0x31, 0x41), RGB(0x00, 0x20, 0x41), RGB(0x00, 0x10, 0x41),
RGB(0x20, 0x20, 0x41), RGB(0x28, 0x20, 0x41), RGB(0x31, 0x20, 0x41), RGB(0x39, 0x20, 0x41),
RGB(0x41, 0x20, 0x41), RGB(0x41, 0x20, 0x39), RGB(0x41, 0x20, 0x31), RGB(0x41, 0x20, 0x28),
RGB(0x41, 0x20, 0x20), RGB(0x41, 0x28, 0x20), RGB(0x41, 0x31, 0x20), RGB(0x41, 0x39, 0x20),
RGB(0x41, 0x41, 0x20), RGB(0x39, 0x41, 0x20), RGB(0x31, 0x41, 0x20), RGB(0x28, 0x41, 0x20),
RGB(0x20, 0x41, 0x20), RGB(0x20, 0x41, 0x28), RGB(0x20, 0x41, 0x31), RGB(0x20, 0x41, 0x39),
RGB(0x20, 0x41, 0x41), RGB(0x20, 0x39, 0x41), RGB(0x20, 0x31, 0x41), RGB(0x20, 0x28, 0x41),
RGB(0x2D, 0x2D, 0x41), RGB(0x31, 0x2D, 0x41), RGB(0x35, 0x2D, 0x41), RGB(0x3D, 0x2D, 0x41),
RGB(0x41, 0x2D, 0x41), RGB(0x41, 0x2D, 0x3D), RGB(0x41, 0x2D, 0x35), RGB(0x41, 0x2D, 0x31),
RGB(0x41, 0x2D, 0x2D), RGB(0x41, 0x31, 0x2D), RGB(0x41, 0x35, 0x2D), RGB(0x41, 0x3D, 0x2D),
RGB(0x41, 0x41, 0x2D), RGB(0x3D, 0x41, 0x2D), RGB(0x35, 0x41, 0x2D), RGB(0x31, 0x41, 0x2D),
RGB(0x2D, 0x41, 0x2D), RGB(0x2D, 0x41, 0x31), RGB(0x2D, 0x41, 0x35), RGB(0x2D, 0x41, 0x3D),
RGB(0x2D, 0x41, 0x41), RGB(0x2D, 0x3D, 0x41), RGB(0x2D, 0x35, 0x41), RGB(0x2D, 0x31, 0x41),
RGB(0x00, 0x00, 0x00), RGB(0x00, 0x00, 0x00), RGB(0x00, 0x00, 0x00), RGB(0x00, 0x00, 0x00),
RGB(0x00, 0x00, 0x00), RGB(0x00, 0x00, 0x00), RGB(0x00, 0x00, 0x00), RGB(0x00, 0x00, 0x00)
};
static BYTE VgaMemory[VGA_NUM_BANKS * VGA_BANK_SIZE];
static BYTE VgaLatchRegisters[VGA_NUM_BANKS] = {0, 0, 0, 0};
static BYTE VgaMiscRegister;
static BYTE VgaSeqIndex = VGA_SEQ_RESET_REG;
static BYTE VgaSeqRegisters[VGA_SEQ_MAX_REG];
static BYTE VgaGcIndex = VGA_GC_RESET_REG;
static BYTE VgaGcRegisters[VGA_GC_MAX_REG];
static BYTE VgaCrtcIndex = VGA_CRTC_HORZ_TOTAL_REG;
static BYTE VgaCrtcRegisters[VGA_CRTC_MAX_REG];
static BYTE VgaAcIndex = VGA_AC_PAL_0_REG;
static BOOLEAN VgaAcLatch = FALSE;
static BYTE VgaAcRegisters[VGA_AC_MAX_REG];
static WORD VgaDacIndex = 0;
static BOOLEAN VgaDacReadWrite = FALSE;
static BYTE VgaDacRegisters[VGA_PALETTE_SIZE];
static HPALETTE PaletteHandle = NULL;
static BOOLEAN InVerticalRetrace = FALSE;
static BOOLEAN InHorizontalRetrace = FALSE;
static HANDLE TextConsoleBuffer = NULL;
static HANDLE GraphicsConsoleBuffer = NULL;
static LPVOID ConsoleFramebuffer = NULL;
static HANDLE ConsoleMutex = NULL;
static BOOLEAN NeedsUpdate = FALSE;
static BOOLEAN ModeChanged = TRUE;
static BOOLEAN CursorMoved = FALSE;
static BOOLEAN PaletteChanged = FALSE;
static BOOLEAN TextMode = TRUE;
static SMALL_RECT UpdateRectangle = { 0, 0, 0, 0 };
/* PRIVATE FUNCTIONS **********************************************************/
static inline INT VgaGetAddressSize(VOID)
{
if (VgaCrtcRegisters[VGA_CRTC_UNDERLINE_REG] & VGA_CRTC_UNDERLINE_DWORD)
{
/* Double-word addressing */
return 4;
}
if (VgaCrtcRegisters[VGA_CRTC_MODE_CONTROL_REG] & VGA_CRTC_MODE_CONTROL_BYTE)
{
/* Byte addressing */
return 1;
}
/* Word addressing */
return 2;
}
static inline DWORD VgaTranslateReadAddress(DWORD Address)
{
DWORD Offset = Address - VgaGetVideoBaseAddress();
BYTE Plane;
/* Check for chain-4 and odd-even mode */
if (VgaSeqRegisters[VGA_SEQ_MEM_REG] & VGA_SEQ_MEM_C4)
{
/* The lowest two bits are the plane number */
Plane = Offset & 3;
Offset >>= 2;
}
else if (VgaGcRegisters[VGA_GC_MODE_REG] & VGA_GC_MODE_OE)
{
/* The LSB is the plane number */
Plane = Offset & 1;
Offset >>= 1;
}
else
{
/* Use the read mode */
Plane = VgaGcRegisters[VGA_GC_READ_MAP_SEL_REG] & 0x03;
}
/* Multiply the offset by the address size */
Offset *= VgaGetAddressSize();
return Offset + Plane * VGA_BANK_SIZE;
}
static inline DWORD VgaTranslateWriteAddress(DWORD Address)
{
DWORD Offset = Address - VgaGetVideoBaseAddress();
/* Check for chain-4 and odd-even mode */
if (VgaSeqRegisters[VGA_SEQ_MEM_REG] & VGA_SEQ_MEM_C4)
{
/* Shift the offset to the right by 2 */
Offset >>= 2;
}
else if (VgaGcRegisters[VGA_GC_MODE_REG] & VGA_GC_MODE_OE)
{
/* Shift the offset to the right by 1 */
Offset >>= 1;
}
/* Multiply the offset by the address size */
Offset *= VgaGetAddressSize();
/* Return the offset on plane 0 */
return Offset;
}
static inline BYTE VgaTranslateByteForWriting(BYTE Data, BYTE Plane)
{
BYTE WriteMode = VgaGcRegisters[VGA_GC_MODE_REG] & 3;
BYTE LogicalOperation = (VgaGcRegisters[VGA_GC_ROTATE_REG] >> 3) & 3;
BYTE RotateCount = VgaGcRegisters[VGA_GC_ROTATE_REG] & 7;
BYTE BitMask = VgaGcRegisters[VGA_GC_BITMASK_REG];
if (WriteMode == 1)
{
/* In write mode 1 just return the latch register */
return VgaLatchRegisters[Plane];
}
if (WriteMode != 2)
{
/* Write modes 0 and 3 rotate the data to the right first */
Data = LOBYTE(((DWORD)Data >> RotateCount) | ((DWORD)Data << (8 - RotateCount)));
}
else
{
/* Write mode 2 expands the appropriate bit to all 8 bits */
Data = (Data & (1 << Plane)) ? 0xFF : 0x00;
}
if (WriteMode == 0)
{
/*
* In write mode 0, the enable set/reset register decides if the
* set/reset bit should be expanded to all 8 bits.
*/
if (VgaGcRegisters[VGA_GC_ENABLE_RESET_REG] & (1 << Plane))
{
/* Copy the bit from the set/reset register to all 8 bits */
Data = (VgaGcRegisters[VGA_GC_RESET_REG] & (1 << Plane)) ? 0xFF : 0x00;
}
}
if (WriteMode != 3)
{
/* Write modes 0 and 2 then perform a logical operation on the data and latch */
if (LogicalOperation == 1) Data &= VgaLatchRegisters[Plane];
else if (LogicalOperation == 2) Data |= VgaLatchRegisters[Plane];
else if (LogicalOperation == 3) Data ^= VgaLatchRegisters[Plane];
}
else
{
/* For write mode 3, we AND the bitmask with the data, which is used as the new bitmask */
BitMask &= Data;
/* Then we expand the bit in the set/reset field */
Data = (VgaGcRegisters[VGA_GC_RESET_REG] & (1 << Plane)) ? 0xFF : 0x00;
}
/* Bits cleared in the bitmask are replaced with latch register bits */
Data = (Data & BitMask) | (VgaLatchRegisters[Plane] & (~BitMask));
/* Return the byte */
return Data;
}
static inline VOID VgaMarkForUpdate(SHORT Row, SHORT Column)
{
DPRINT("VgaMarkForUpdate: Row %d, Column %d\n", Row, Column);
/* Check if this is the first time the rectangle is updated */
if (!NeedsUpdate)
{
UpdateRectangle.Left = UpdateRectangle.Top = SHRT_MAX;
UpdateRectangle.Right = UpdateRectangle.Bottom = SHRT_MIN;
}
/* Expand the rectangle to include the point */
UpdateRectangle.Left = min(UpdateRectangle.Left, Column);
UpdateRectangle.Right = max(UpdateRectangle.Right, Column);
UpdateRectangle.Top = min(UpdateRectangle.Top, Row);
UpdateRectangle.Bottom = max(UpdateRectangle.Bottom, Row);
/* Set the update request flag */
NeedsUpdate = TRUE;
}
static VOID VgaWriteSequencer(BYTE Data)
{
ASSERT(VgaSeqIndex < VGA_SEQ_MAX_REG);
/* Save the value */
VgaSeqRegisters[VgaSeqIndex] = Data;
}
static VOID VgaWriteGc(BYTE Data)
{
ASSERT(VgaGcIndex < VGA_GC_MAX_REG);
/* Save the value */
VgaGcRegisters[VgaGcIndex] = Data;
/* Check the index */
switch (VgaGcIndex)
{
case VGA_GC_MISC_REG:
{
/* The GC misc register decides if it's text or graphics mode */
ModeChanged = TRUE;
break;
}
}
}
static VOID VgaWriteCrtc(BYTE Data)
{
ASSERT(VgaGcIndex < VGA_CRTC_MAX_REG);
/* Save the value */
VgaCrtcRegisters[VgaCrtcIndex] = Data;
/* Check the index */
switch (VgaCrtcIndex)
{
case VGA_CRTC_END_HORZ_DISP_REG:
case VGA_CRTC_VERT_DISP_END_REG:
case VGA_CRTC_OVERFLOW_REG:
{
/* The video mode has changed */
ModeChanged = TRUE;
break;
}
case VGA_CRTC_CURSOR_LOC_LOW_REG:
case VGA_CRTC_CURSOR_LOC_HIGH_REG:
case VGA_CRTC_CURSOR_START_REG:
case VGA_CRTC_CURSOR_END_REG:
{
/* Set the cursor moved flag */
CursorMoved = TRUE;
break;
}
}
}
static VOID VgaWriteDac(BYTE Data)
{
INT PaletteIndex;
PALETTEENTRY Entry;
/* Set the value */
VgaDacRegisters[VgaDacIndex] = Data;
/* Find the palette index */
PaletteIndex = VgaDacIndex / 3;
/* 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.peFlags = 0;
/* Update the palette entry */
SetPaletteEntries(PaletteHandle, PaletteIndex, 1, &Entry);
/* Set the palette change flag */
PaletteChanged = TRUE;
/* Update the index */
VgaDacIndex++;
VgaDacIndex %= VGA_PALETTE_SIZE;
}
static VOID VgaWriteAc(BYTE Data)
{
ASSERT(VgaAcIndex < VGA_AC_MAX_REG);
/* Save the value */
VgaAcRegisters[VgaAcIndex] = Data;
}
static BOOL VgaEnterGraphicsMode(PCOORD Resolution)
{
DWORD i;
CONSOLE_GRAPHICS_BUFFER_INFO GraphicsBufferInfo;
BYTE BitmapInfoBuffer[VGA_BITMAP_INFO_SIZE];
LPBITMAPINFO BitmapInfo = (LPBITMAPINFO)BitmapInfoBuffer;
LPWORD PaletteIndex = (LPWORD)(BitmapInfo->bmiColors);
/* Fill the bitmap info header */
ZeroMemory(&BitmapInfo->bmiHeader, sizeof(BITMAPINFOHEADER));
BitmapInfo->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
BitmapInfo->bmiHeader.biWidth = Resolution->X;
BitmapInfo->bmiHeader.biHeight = Resolution->Y;
BitmapInfo->bmiHeader.biBitCount = 8;
BitmapInfo->bmiHeader.biPlanes = 1;
BitmapInfo->bmiHeader.biCompression = BI_RGB;
BitmapInfo->bmiHeader.biSizeImage = Resolution->X * Resolution->Y /* * 1 == biBitCount / 8 */;
/* Fill the palette data */
for (i = 0; i < (VGA_PALETTE_SIZE / 3); i++) PaletteIndex[i] = (WORD)i;
/* Fill the console graphics buffer info */
GraphicsBufferInfo.dwBitMapInfoLength = VGA_BITMAP_INFO_SIZE;
GraphicsBufferInfo.lpBitMapInfo = BitmapInfo;
GraphicsBufferInfo.dwUsage = DIB_PAL_COLORS;
/* Create the buffer */
GraphicsConsoleBuffer = CreateConsoleScreenBuffer(GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
CONSOLE_GRAPHICS_BUFFER,
&GraphicsBufferInfo);
if (GraphicsConsoleBuffer == INVALID_HANDLE_VALUE) return FALSE;
/* Save the framebuffer address and mutex */
ConsoleFramebuffer = GraphicsBufferInfo.lpBitMap;
ConsoleMutex = GraphicsBufferInfo.hMutex;
/* Clear the framebuffer */
ZeroMemory(ConsoleFramebuffer, BitmapInfo->bmiHeader.biSizeImage);
/* Set the active buffer */
SetConsoleActiveScreenBuffer(GraphicsConsoleBuffer);
/* Set the graphics mode palette */
SetConsolePalette(GraphicsConsoleBuffer,
PaletteHandle,
SYSPAL_NOSTATIC256);
/* Clear the text mode flag */
TextMode = FALSE;
return TRUE;
}
static VOID VgaLeaveGraphicsMode(VOID)
{
/* Release the console framebuffer mutex if needed */
ReleaseMutex(ConsoleMutex);
/* Switch back to the text buffer */
SetConsoleActiveScreenBuffer(TextConsoleBuffer);
/* Cleanup the video data */
CloseHandle(ConsoleMutex);
ConsoleMutex = NULL;
CloseHandle(GraphicsConsoleBuffer);
GraphicsConsoleBuffer = NULL;
}
static BOOL VgaEnterTextMode(PCOORD Resolution)
{
/* Resize the console */
SetConsoleScreenBufferSize(TextConsoleBuffer, *Resolution);
/* Allocate a framebuffer */
ConsoleFramebuffer = HeapAlloc(GetProcessHeap(),
HEAP_ZERO_MEMORY,
Resolution->X * Resolution->Y
* sizeof(CHAR_INFO));
if (ConsoleFramebuffer == NULL)
{
DisplayMessage(L"An unexpected error occurred!\n");
VdmRunning = FALSE;
return FALSE;
}
/* Set the text mode flag */
TextMode = TRUE;
return TRUE;
}
static VOID VgaLeaveTextMode(VOID)
{
/* Free the old framebuffer */
HeapFree(GetProcessHeap(), 0, ConsoleFramebuffer);
ConsoleFramebuffer = NULL;
}
static VOID VgaChangeMode(VOID)
{
COORD Resolution = VgaGetDisplayResolution();
/* Reset the mode change flag */
// ModeChanged = FALSE;
if (!TextMode)
{
/* Leave the current graphics mode */
VgaLeaveGraphicsMode();
}
else
{
/* Leave the current text mode */
VgaLeaveTextMode();
}
/* Check if the new mode is alphanumeric */
if (!(VgaGcRegisters[VGA_GC_MISC_REG] & VGA_GC_MISC_NOALPHA))
{
/* Enter new text mode */
if (!VgaEnterTextMode(&Resolution))
{
DisplayMessage(L"An unexpected VGA error occurred while switching into text mode.");
VdmRunning = FALSE;
return;
}
}
else
{
/* Enter 8-bit graphics mode */
if (!VgaEnterGraphicsMode(&Resolution))
{
DisplayMessage(L"An unexpected VGA error occurred while switching into graphics mode.");
VdmRunning = FALSE;
return;
}
}
/* Trigger a full update of the screen */
NeedsUpdate = TRUE;
UpdateRectangle.Left = 0;
UpdateRectangle.Top = 0;
UpdateRectangle.Right = Resolution.X;
UpdateRectangle.Bottom = Resolution.Y;
/* Reset the mode change flag */
ModeChanged = FALSE;
}
static VOID VgaUpdateFramebuffer(VOID)
{
INT i, j, k;
COORD Resolution = VgaGetDisplayResolution();
INT AddressSize = VgaGetAddressSize();
DWORD Address = (VgaCrtcRegisters[VGA_CRTC_START_ADDR_HIGH_REG] << 8)
+ VgaCrtcRegisters[VGA_CRTC_START_ADDR_LOW_REG];
DWORD ScanlineSize = (DWORD)VgaCrtcRegisters[VGA_CRTC_OFFSET_REG] * 2;
/*
* If console framebuffer is NULL, that means something went wrong
* earlier and this is the final display refresh.
*/
if (ConsoleFramebuffer == NULL) return;
/* Check if this is text mode or graphics mode */
if (VgaGcRegisters[VGA_GC_MISC_REG] & VGA_GC_MISC_NOALPHA)
{
/* Graphics mode */
PBYTE GraphicsBuffer = (PBYTE)ConsoleFramebuffer;
/*
* Synchronize access to the graphics framebuffer
* with the console framebuffer mutex.
*/
WaitForSingleObject(ConsoleMutex, INFINITE);
/* Loop through the scanlines */
for (i = 0; i < Resolution.Y; i++)
{
/* Loop through the pixels */
for (j = 0; j < Resolution.X; j++)
{
BYTE PixelData = 0;
/* Check the shifting mode */
if (VgaGcRegisters[VGA_GC_MODE_REG] & VGA_GC_MODE_SHIFT256)
{
/* 4 bits shifted from each plane */
/* Check if this is 16 or 256 color mode */
if (VgaAcRegisters[VGA_AC_CONTROL_REG] & VGA_AC_CONTROL_8BIT)
{
/* One byte per pixel */
PixelData = VgaMemory[(j % VGA_NUM_BANKS) * VGA_BANK_SIZE
+ (Address + (j / VGA_NUM_BANKS))
* AddressSize];
}
else
{
/* 4-bits per pixel */
PixelData = VgaMemory[(j % VGA_NUM_BANKS) * VGA_BANK_SIZE
+ (Address + (j / (VGA_NUM_BANKS * 2)))
* AddressSize];
/* Check if we should use the highest 4 bits or lowest 4 */
if (((j / VGA_NUM_BANKS) % 2) == 0)
{
/* Highest 4 */
PixelData >>= 4;
}
else
{
/* Lowest 4 */
PixelData &= 0x0F;
}
}
}
else if (VgaGcRegisters[VGA_GC_MODE_REG] & VGA_GC_MODE_SHIFTREG)
{
/* Check if this is 16 or 256 color mode */
if (VgaAcRegisters[VGA_AC_CONTROL_REG] & VGA_AC_CONTROL_8BIT)
{
// TODO: NOT IMPLEMENTED
DPRINT1("8-bit interleaved mode is not implemented!\n");
}
else
{
/*
* 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) + 2) * VGA_BANK_SIZE
+ (Address + (j / 4)) * AddressSize];
/* 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
{
/* 1 bit shifted from each plane */
/* Check if this is 16 or 256 color mode */
if (VgaAcRegisters[VGA_AC_CONTROL_REG] & VGA_AC_CONTROL_8BIT)
{
/* 8 bits per pixel, 2 on each plane */
for (k = 0; k < VGA_NUM_BANKS; k++)
{
/* The data is on plane k, 4 pixels per byte */
BYTE PlaneData = VgaMemory[k * VGA_BANK_SIZE
+ (Address + (j / 4)) * AddressSize];
/* The mask of the first bit in the pair */
BYTE BitMask = 1 << (((3 - (j % 4)) * 2) + 1);
/* Bits 0, 1, 2 and 3 come from the first bit of the pair */
if (PlaneData & BitMask) PixelData |= 1 << k;
/* Bits 4, 5, 6 and 7 come from the second bit of the pair */
if (PlaneData & (BitMask >> 1)) PixelData |= 1 << (k + 4);
}
}
else
{
/* 4 bits per pixel, 1 on each plane */
for (k = 0; k < VGA_NUM_BANKS; k++)
{
BYTE PlaneData = VgaMemory[k * VGA_BANK_SIZE
+ (Address + (j / 8)) * AddressSize];
/* If the bit on that plane is set, set it */
if (PlaneData & (1 << (7 - (j % 8)))) PixelData |= 1 << k;
}
}
}
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)
{
/* Yes, write the new value */
GraphicsBuffer[i * Resolution.X + j] = PixelData;
/* Mark the specified pixel as changed */
VgaMarkForUpdate(i, j);
}
}
/* Move to the next scanline */
Address += ScanlineSize;
}
/*
* Release the console framebuffer mutex
* so that we allow for repainting.
*/
ReleaseMutex(ConsoleMutex);
}
else
{
/* Text mode */
PCHAR_INFO CharBuffer = (PCHAR_INFO)ConsoleFramebuffer;
/* Loop through the scanlines */
for (i = 0; i < Resolution.Y; i++)
{
/* Loop through the characters */
for (j = 0; j < Resolution.X; j++)
{
DWORD CurrentAddr = LOWORD((Address + j) * AddressSize);
CHAR_INFO CharInfo;
/* Plane 0 holds the character itself */
CharInfo.Char.AsciiChar = VgaMemory[CurrentAddr];
/* Plane 1 holds the attribute */
CharInfo.Attributes = VgaMemory[CurrentAddr + VGA_BANK_SIZE];
/* Now check if the resulting character data has changed */
if ((CharBuffer[i * Resolution.X + j].Char.AsciiChar != CharInfo.Char.AsciiChar)
|| (CharBuffer[i * Resolution.X + j].Attributes != CharInfo.Attributes))
{
/* Yes, write the new value */
CharBuffer[i * Resolution.X + j] = CharInfo;
/* Mark the specified cell as changed */
VgaMarkForUpdate(i, j);
}
}
/* Move to the next scanline */
Address += ScanlineSize;
}
}
}
static VOID VgaUpdateTextCursor(VOID)
{
COORD Position;
CONSOLE_CURSOR_INFO CursorInfo;
BYTE CursorStart = VgaCrtcRegisters[VGA_CRTC_CURSOR_START_REG] & 0x3F;
BYTE CursorEnd = VgaCrtcRegisters[VGA_CRTC_CURSOR_END_REG] & 0x1F;
DWORD ScanlineSize = (DWORD)VgaCrtcRegisters[VGA_CRTC_OFFSET_REG] * 2;
BYTE TextSize = 1 + (VgaCrtcRegisters[VGA_CRTC_MAX_SCAN_LINE_REG] & 0x1F);
WORD Location = MAKEWORD(VgaCrtcRegisters[VGA_CRTC_CURSOR_LOC_LOW_REG],
VgaCrtcRegisters[VGA_CRTC_CURSOR_LOC_HIGH_REG]);
if (CursorStart < CursorEnd)
{
/* Visible cursor */
CursorInfo.bVisible = TRUE;
CursorInfo.dwSize = (100 * (CursorEnd - CursorStart)) / TextSize;
}
else
{
/* No cursor */
CursorInfo.bVisible = FALSE;
CursorInfo.dwSize = 0;
}
/* Add the cursor skew to the location */
Location += (VgaCrtcRegisters[VGA_CRTC_CURSOR_END_REG] >> 5) & 3;
/* Find the coordinates of the new position */
Position.X = (WORD)(Location % ScanlineSize);
Position.Y = (WORD)(Location / ScanlineSize);
/* Update the physical cursor */
SetConsoleCursorInfo(TextConsoleBuffer, &CursorInfo);
SetConsoleCursorPosition(TextConsoleBuffer, Position);
/* Reset the cursor move flag */
CursorMoved = FALSE;
}
/* PUBLIC FUNCTIONS ***********************************************************/
DWORD VgaGetVideoBaseAddress(VOID)
{
return MemoryBase[(VgaGcRegisters[VGA_GC_MISC_REG] >> 2) & 0x03];
}
DWORD VgaGetVideoLimitAddress(VOID)
{
return MemoryLimit[(VgaGcRegisters[VGA_GC_MISC_REG] >> 2) & 0x03];
}
COORD VgaGetDisplayResolution(VOID)
{
COORD Resolution;
BYTE MaximumScanLine = 1 + (VgaCrtcRegisters[VGA_CRTC_MAX_SCAN_LINE_REG] & 0x1F);
/* The low 8 bits are in the display registers */
Resolution.X = VgaCrtcRegisters[VGA_CRTC_END_HORZ_DISP_REG];
Resolution.Y = VgaCrtcRegisters[VGA_CRTC_VERT_DISP_END_REG];
/* Set the top bits from the overflow register */
if (VgaCrtcRegisters[VGA_CRTC_OVERFLOW_REG] & VGA_CRTC_OVERFLOW_VDE8)
{
Resolution.Y |= 1 << 8;
}
if (VgaCrtcRegisters[VGA_CRTC_OVERFLOW_REG] & VGA_CRTC_OVERFLOW_VDE9)
{
Resolution.Y |= 1 << 9;
}
/* Increase the values by 1 */
Resolution.X++;
Resolution.Y++;
if (VgaGcRegisters[VGA_GC_MISC_REG] & VGA_GC_MISC_NOALPHA)
{
/* Multiply the horizontal resolution by the 9/8 dot mode */
Resolution.X *= (VgaSeqRegisters[VGA_SEQ_CLOCK_REG] & VGA_SEQ_CLOCK_98DM)
? 8 : 9;
/* The horizontal resolution is halved in 8-bit mode */
if (VgaAcRegisters[VGA_AC_CONTROL_REG] & VGA_AC_CONTROL_8BIT) Resolution.X /= 2;
}
/* Divide the vertical resolution by the maximum scan line (== font size in text mode) */
Resolution.Y /= MaximumScanLine;
/* Return the resolution */
return Resolution;
}
VOID VgaRefreshDisplay(VOID)
{
COORD Resolution = VgaGetDisplayResolution();
DPRINT("VgaRefreshDisplay\n");
/* Change the display mode */
if (ModeChanged) VgaChangeMode();
/* Change the text cursor location */
if (CursorMoved) VgaUpdateTextCursor();
if (PaletteChanged)
{
if (VgaGcRegisters[VGA_GC_MISC_REG] & VGA_GC_MISC_NOALPHA)
{
/* Trigger a full update of the screen */
NeedsUpdate = TRUE;
UpdateRectangle.Left = 0;
UpdateRectangle.Top = 0;
UpdateRectangle.Right = Resolution.X;
UpdateRectangle.Bottom = Resolution.Y;
}
PaletteChanged = FALSE;
}
/* Update the contents of the framebuffer */
VgaUpdateFramebuffer();
/* Set the vertical retrace flag */
InVerticalRetrace = TRUE;
/* Ignore if there's nothing to update */
if (!NeedsUpdate) return;
DPRINT("Updating screen rectangle (%d, %d, %d, %d)\n",
UpdateRectangle.Left,
UpdateRectangle.Top,
UpdateRectangle.Right,
UpdateRectangle.Bottom);
/* Check if this is text mode or graphics mode */
if (VgaGcRegisters[VGA_GC_MISC_REG] & VGA_GC_MISC_NOALPHA)
{
/* Graphics mode */
/* Redraw the screen */
InvalidateConsoleDIBits(GraphicsConsoleBuffer, &UpdateRectangle);
}
else
{
/* Text mode */
COORD Origin = { UpdateRectangle.Left, UpdateRectangle.Top };
/* Write the data to the console */
WriteConsoleOutputA(TextConsoleBuffer,
(PCHAR_INFO)ConsoleFramebuffer,
Resolution,
Origin,
&UpdateRectangle);
}
/* Clear the update flag */
NeedsUpdate = FALSE;
}
VOID VgaHorizontalRetrace(VOID)
{
/* Set the flag */
InHorizontalRetrace = TRUE;
}
VOID VgaReadMemory(DWORD Address, LPBYTE Buffer, DWORD Size)
{
DWORD i;
DWORD VideoAddress;
DPRINT("VgaReadMemory: Address 0x%08X, Size %lu\n",
Address,
Size);
/* Ignore if video RAM access is disabled */
if (!(VgaMiscRegister & VGA_MISC_RAM_ENABLED)) return;
/* Loop through each byte */
for (i = 0; i < Size; i++)
{
VideoAddress = VgaTranslateReadAddress(Address + i);
/* Load the latch registers */
VgaLatchRegisters[0] = VgaMemory[LOWORD(VideoAddress)];
VgaLatchRegisters[1] = VgaMemory[VGA_BANK_SIZE + LOWORD(VideoAddress)];
VgaLatchRegisters[2] = VgaMemory[(2 * VGA_BANK_SIZE) + LOWORD(VideoAddress)];
VgaLatchRegisters[3] = VgaMemory[(3 * VGA_BANK_SIZE) + LOWORD(VideoAddress)];
/* Copy the value to the buffer */
Buffer[i] = VgaMemory[VideoAddress];
}
}
VOID VgaWriteMemory(DWORD Address, LPBYTE Buffer, DWORD Size)
{
DWORD i, j;
DWORD VideoAddress;
DPRINT("VgaWriteMemory: Address 0x%08X, Size %lu\n",
Address,
Size);
/* Ignore if video RAM access is disabled */
if (!(VgaMiscRegister & VGA_MISC_RAM_ENABLED)) return;
/* Also ignore if write access to all planes is disabled */
if ((VgaSeqRegisters[VGA_SEQ_MASK_REG] & 0x0F) == 0x00) return;
/* Loop through each byte */
for (i = 0; i < Size; i++)
{
VideoAddress = VgaTranslateWriteAddress(Address + i);
for (j = 0; j < VGA_NUM_BANKS; j++)
{
/* Make sure the page is writeable */
if (!(VgaSeqRegisters[VGA_SEQ_MASK_REG] & (1 << j))) continue;
/* Check if this is chain-4 mode */
if (VgaSeqRegisters[VGA_SEQ_MEM_REG] & VGA_SEQ_MEM_C4)
{
if (((Address + i) & 3) != j)
{
/* This plane will not be accessed */
continue;
}
}
/* Check if this is odd-even mode */
if (VgaGcRegisters[VGA_GC_MODE_REG] & VGA_GC_MODE_OE)
{
if (((Address + i) & 1) != (j & 1))
{
/* This plane will not be accessed */
continue;
}
}
/* Copy the value to the VGA memory */
VgaMemory[VideoAddress + j * VGA_BANK_SIZE] = VgaTranslateByteForWriting(Buffer[i], j);
}
}
}
BYTE VgaReadPort(WORD Port)
{
DPRINT("VgaReadPort: Port 0x%04X\n", Port);
switch (Port)
{
case VGA_AC_INDEX:
{
return VgaAcIndex;
}
case VGA_AC_READ:
{
return VgaAcRegisters[VgaAcIndex];
}
case VGA_SEQ_INDEX:
{
return VgaSeqIndex;
}
case VGA_SEQ_DATA:
{
return VgaSeqRegisters[VgaSeqIndex];
}
case VGA_DAC_READ_INDEX:
{
/* This returns the read/write state */
return VgaDacReadWrite ? 0 : 3;
}
case VGA_DAC_WRITE_INDEX:
{
return VgaDacIndex / 3;
}
case VGA_DAC_DATA:
{
/* Ignore reads in write mode */
if (!VgaDacReadWrite)
{
BYTE Data = VgaDacRegisters[VgaDacIndex++];
VgaDacIndex %= VGA_PALETTE_SIZE;
return Data;
}
break;
}
case VGA_MISC_READ:
{
return VgaMiscRegister;
}
case VGA_CRTC_INDEX:
{
return VgaCrtcIndex;
}
case VGA_CRTC_DATA:
{
return VgaCrtcRegisters[VgaCrtcIndex];
}
case VGA_GC_INDEX:
{
return VgaGcIndex;
}
case VGA_GC_DATA:
{
return VgaGcRegisters[VgaGcIndex];
}
case VGA_STAT_MONO:
case VGA_STAT_COLOR:
{
BYTE Result = 0;
/* Reset the AC latch */
VgaAcLatch = FALSE;
/* Set a flag if there is a vertical or horizontal retrace */
if (InVerticalRetrace || InHorizontalRetrace) Result |= VGA_STAT_DD;
/* Set an additional flag if there was a vertical retrace */
if (InVerticalRetrace) Result |= VGA_STAT_VRETRACE;
/* Clear the flags */
InHorizontalRetrace = InVerticalRetrace = FALSE;
return Result;
}
}
return 0;
}
VOID VgaWritePort(WORD Port, BYTE Data)
{
DPRINT("VgaWritePort: Port 0x%04X, Data 0x%02X\n", Port, Data);
switch (Port)
{
case VGA_AC_INDEX:
{
if (!VgaAcLatch)
{
/* Change the index */
if (Data < VGA_AC_MAX_REG) VgaAcIndex = Data;
}
else
{
/* Write the data */
VgaWriteAc(Data);
}
/* Toggle the latch */
VgaAcLatch = !VgaAcLatch;
break;
}
case VGA_SEQ_INDEX:
{
/* Set the sequencer index register */
if (Data < VGA_SEQ_MAX_REG) VgaSeqIndex = Data;
break;
}
case VGA_SEQ_DATA:
{
/* Call the sequencer function */
VgaWriteSequencer(Data);
break;
}
case VGA_DAC_READ_INDEX:
{
VgaDacReadWrite = FALSE;
VgaDacIndex = Data * 3;
break;
}
case VGA_DAC_WRITE_INDEX:
{
VgaDacReadWrite = TRUE;
VgaDacIndex = Data * 3;
break;
}
case VGA_DAC_DATA:
{
/* Ignore writes in read mode */
if (VgaDacReadWrite) VgaWriteDac(Data & 0x3F);
break;
}
case VGA_MISC_WRITE:
{
VgaMiscRegister = Data;
break;
}
case VGA_CRTC_INDEX:
{
/* Set the CRTC index register */
if (Data < VGA_CRTC_MAX_REG) VgaCrtcIndex = Data;
break;
}
case VGA_CRTC_DATA:
{
/* Call the CRTC function */
VgaWriteCrtc(Data);
break;
}
case VGA_GC_INDEX:
{
/* Set the GC index register */
if (Data < VGA_GC_MAX_REG) VgaGcIndex = Data;
break;
}
case VGA_GC_DATA:
{
/* Call the GC function */
VgaWriteGc(Data);
break;
}
}
}
VOID VgaClearMemory(VOID)
{
ZeroMemory(VgaMemory, sizeof(VgaMemory));
}
BOOLEAN VgaInitialize(HANDLE TextHandle)
{
INT i, j;
COORD Resolution;
INT AddressSize;
DWORD ScanlineSize;
COORD Origin = { 0, 0 };
SMALL_RECT ScreenRect;
PCHAR_INFO CharBuffer;
DWORD Address = 0;
DWORD CurrentAddr;
LPLOGPALETTE Palette;
/* Set the global handle */
TextConsoleBuffer = TextHandle;
/* Clear the VGA memory */
VgaClearMemory();
/* Set the default video mode */
BiosSetVideoMode(BIOS_DEFAULT_VIDEO_MODE);
VgaChangeMode();
/* Get the data */
Resolution = VgaGetDisplayResolution();
CharBuffer = (PCHAR_INFO)ConsoleFramebuffer;
AddressSize = VgaGetAddressSize();
ScreenRect.Left = ScreenRect.Top = 0;
ScreenRect.Right = Resolution.X;
ScreenRect.Bottom = Resolution.Y;
ScanlineSize = (DWORD)VgaCrtcRegisters[VGA_CRTC_OFFSET_REG] * 2;
/* Read the data from the console into the framebuffer */
ReadConsoleOutputA(TextConsoleBuffer,
CharBuffer,
Resolution,
Origin,
&ScreenRect);
/* Loop through the scanlines */
for (i = 0; i < Resolution.Y; i++)
{
/* Loop through the characters */
for (j = 0; j < Resolution.X; j++)
{
CurrentAddr = LOWORD((Address + j) * AddressSize);
/* Store the character in plane 0 */
VgaMemory[CurrentAddr] = CharBuffer[i * Resolution.X + j].Char.AsciiChar;
/* Store the attribute in plane 1 */
VgaMemory[CurrentAddr + VGA_BANK_SIZE] = (BYTE)CharBuffer[i * Resolution.X + j].Attributes;
}
/* Move to the next scanline */
Address += ScanlineSize;
}
/* Allocate storage space for the palette */
Palette = (LPLOGPALETTE)HeapAlloc(GetProcessHeap(),
HEAP_ZERO_MEMORY,
sizeof(LOGPALETTE)
+ VGA_MAX_COLORS * sizeof(PALETTEENTRY));
if (Palette == NULL) return FALSE;
/* Initialize the palette */
Palette->palVersion = 0x0300;
Palette->palNumEntries = VGA_MAX_COLORS;
/* Copy the colors of the default palette to the DAC and console palette */
for (i = 0; i < VGA_MAX_COLORS; i++)
{
/* Set the palette entries */
Palette->palPalEntry[i].peRed = GetRValue(VgaDefaultPalette[i]);
Palette->palPalEntry[i].peGreen = GetGValue(VgaDefaultPalette[i]);
Palette->palPalEntry[i].peBlue = GetBValue(VgaDefaultPalette[i]);
Palette->palPalEntry[i].peFlags = 0;
/* Set the DAC registers */
VgaDacRegisters[i * 3] = VGA_COLOR_TO_DAC(GetRValue(VgaDefaultPalette[i]));
VgaDacRegisters[i * 3 + 1] = VGA_COLOR_TO_DAC(GetGValue(VgaDefaultPalette[i]));
VgaDacRegisters[i * 3 + 2] = VGA_COLOR_TO_DAC(GetBValue(VgaDefaultPalette[i]));
}
/* Create the palette */
PaletteHandle = CreatePalette(Palette);
/* Free the palette */
HeapFree(GetProcessHeap(), 0, Palette);
/* Return success if the palette was successfully created */
return (PaletteHandle ? TRUE : FALSE);
}
/* EOF */
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