drivers/dd/vga/display/objects/screen.c

   1 #include "../vgaddi.h"
   2
   3 static WORD PaletteBuffer[] = {
   4    16, 0, // 16 entries, start with 0
   5    0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
   6 };
   7
   8 static BYTE ColorBuffer[] = {
   9   16, // 16 entries
  10   0, 0,
  11   0,  // start with 0
  12   0x00, 0x00, 0x00, 0x00, // black
  13   0x2A, 0x00, 0x15, 0x00, // red
  14   0x00, 0x2A, 0x15, 0x00, // green
  15   0x2A, 0x2A, 0x15, 0x00, // brown
  16   0x00, 0x00, 0x2A, 0x00, // blue
  17   0x2A, 0x15, 0x2A, 0x00, // magenta
  18   0x15, 0x2A, 0x2A, 0x00, // cyan
  19   0x21, 0x22, 0x23, 0x00, // dark gray
  20   0x30, 0x31, 0x32, 0x00, // light gray
  21   0x3F, 0x00, 0x00, 0x00, // bright red
  22   0x00, 0x3F, 0x00, 0x00, // bright green
  23   0x3F, 0x3F, 0x00, 0x00, // bright yellow
  24   0x00, 0x00, 0x3F, 0x00, // bright blue
  25   0x3F, 0x00, 0x3F, 0x00, // bright magenta
  26   0x00, 0x3F, 0x3F, 0x00, // bright cyan
  27   0x3F, 0x3F, 0x3F, 0x00  // bright white
  28 };
  29
  30 DWORD getAvailableModes(HANDLE Driver,
  31                         PVIDEO_MODE_INFORMATION *modeInformation,
  32                         DWORD *ModeSize)
  33 {
  34   ULONG Temp;
  35   VIDEO_NUM_MODES modes;
  36   PVIDEO_MODE_INFORMATION VideoTemp;
  37
  38   // get number of modes supported
  39   if (EngDeviceIoControl(Driver,
  40                          IOCTL_VIDEO_QUERY_NUM_AVAIL_MODES,
  41                          NULL,
  42                          0,
  43                          &modes,
  44                          sizeof(VIDEO_NUM_MODES),
  45                          &Temp))
  46   {
  47     // get modes failed
  48     return(0);
  49   }
  50
  51   *ModeSize = modes.ModeInformationLength;
  52
  53   // allocate buffer for the mini-port to write the modes in
  54   *modeInformation = (PVIDEO_MODE_INFORMATION)
  55                       EngAllocMem(0, modes.NumModes *
  56                                   modes.ModeInformationLength, ALLOC_TAG);
  57
  58   if (*modeInformation == (PVIDEO_MODE_INFORMATION) NULL)
  59   {
  60     // couldn't allocate buffer
  61     return 0;
  62   }
  63
  64   // Ask the mini-port to fill in the available modes.
  65   if (EngDeviceIoControl(Driver,
  66                          IOCTL_VIDEO_QUERY_AVAIL_MODES,
  67                          NULL,
  68                          0,
  69                          *modeInformation,
  70                          modes.NumModes * modes.ModeInformationLength,
  71                          &Temp))
  72   {
  73     // failed to query modes
  74     EngFreeMem(*modeInformation);
  75     *modeInformation = (PVIDEO_MODE_INFORMATION) NULL;
  76
  77     return(0);
  78   }
  79
  80   // Which modes supported by miniport driver are also suppoted by us, the
  81   // display driver
  82
  83   Temp = modes.NumModes;
  84   VideoTemp = *modeInformation;
  85
  86   // Reject mode if it's not 4 planes or not graphic or not 1 bits per pel
  87   while (Temp--)
  88   {
  89     if ((VideoTemp->NumberOfPlanes != 4 ) ||
  90         !(VideoTemp->AttributeFlags & VIDEO_MODE_GRAPHICS) ||
  91         (VideoTemp->BitsPerPlane != 1) ||
  92         BROKEN_RASTERS(VideoTemp->ScreenStride, VideoTemp->VisScreenHeight))
  93
  94     {
  95       VideoTemp->Length = 0;
  96     }
  97
  98     VideoTemp = (PVIDEO_MODE_INFORMATION)(((PUCHAR)VideoTemp) + modes.ModeInformationLength);
  99   }
 100
 101   return modes.NumModes;
 102 }
 103
 104 BOOL InitVGA(PPDEV ppdev, BOOL bFirst)
 105 {
 106   ULONG ReturnedDataLength;
 107   VIDEO_MEMORY VideoMemory;
 108   VIDEO_MEMORY_INFORMATION VideoMemoryInfo;
 109
 110   char* vidmem;
 111
 112   ppdev->ModeNum = 12;
 113
 114   // Set the mode that was requested
 115   if (EngDeviceIoControl(ppdev->KMDriver,
 116                          IOCTL_VIDEO_SET_CURRENT_MODE,
 117                          &ppdev->ModeNum,
 118                          sizeof(VIDEO_MODE),
 119                          NULL,
 120                          0,
 121                          &ReturnedDataLength)) {
 122     return(FALSE);
 123   }
 124
 125   // set up internal palette
 126   if (EngDeviceIoControl(ppdev->KMDriver,
 127                          IOCTL_VIDEO_SET_PALETTE_REGISTERS,
 128                          (PVOID) PaletteBuffer,
 129                          sizeof (PaletteBuffer),
 130                          NULL,
 131                          0,
 132                          &ReturnedDataLength)) {
 133      return(FALSE);
 134   }
 135
 136   // set up the DAC
 137   if (EngDeviceIoControl(ppdev->KMDriver,
 138                           IOCTL_VIDEO_SET_COLOR_REGISTERS,
 139                           (PVOID) ColorBuffer,
 140                           sizeof (ColorBuffer),
 141                           NULL,
 142                           0,
 143                           &ReturnedDataLength)) {
 144     return(FALSE);
 145   }
 146
 147 /*
 148
 149 gotta fix this up.. it prevents drawing to vidmem right now
 150
 151     if (bFirst) {
 152       // map video memory into virtual memory
 153       VideoMemory.RequestedVirtualAddress = NULL;
 154
 155       if (EngDeviceIoControl(ppdev->KMDriver,
 156                              IOCTL_VIDEO_MAP_VIDEO_MEMORY,
 157                              (PVOID) &VideoMemory,
 158                              sizeof (VIDEO_MEMORY),
 159                              (PVOID) &VideoMemoryInfo,
 160                              sizeof (VideoMemoryInfo),
 161                              &ReturnedDataLength)) {
 162          // Failed to map to virtual memory
 163          return (FALSE);
 164       }
 165
 166       ppdev->fbScreen = VideoMemoryInfo.FrameBufferBase;
 167    }
 168 */
 169   return TRUE;
 170 }