Kernel/drv/vterm.c

   1 /*
   2  * Acess2 Virtual Terminal Driver
   3  */
   4 #define DEBUG   0
   5 #include <acess.h>
   6 #include <fs_devfs.h>
   7 #include <modules.h>
   8 #include <tpl_drv_video.h>
   9 #include <tpl_drv_keyboard.h>
  10 #include <tpl_drv_terminal.h>
  11 #include <errno.h>
  12 #include <semaphore.h>
  13
  14 #define USE_CTRL_ALT    1
  15
  16 // === CONSTANTS ===
  17 #define VERSION ((0<<8)|(50))
  18
  19 #define NUM_VTS 8
  20 #define MAX_INPUT_CHARS32       64
  21 #define MAX_INPUT_CHARS8        (MAX_INPUT_CHARS32*4)
  22 //#define DEFAULT_OUTPUT        "BochsGA"
  23 #define DEFAULT_OUTPUT  "Vesa"
  24 #define DEFAULT_INPUT   "PS2Keyboard"
  25 #define DEFAULT_WIDTH   640
  26 #define DEFAULT_HEIGHT  480
  27 #define DEFAULT_SCROLLBACK      2       // 2 Screens of text + current screen
  28 #define DEFAULT_COLOUR  (VT_COL_BLACK|(0xAAA<<16))
  29
  30 #define VT_FLAG_HIDECSR 0x01
  31 #define VT_FLAG_ALTBUF  0x02    //!< Alternate screen buffer
  32 #define VT_FLAG_HASFB   0x10    //!< Set if the VTerm has requested the Framebuffer
  33
  34 enum eVT_InModes {
  35         VT_INMODE_TEXT8,        // UTF-8 Text Mode (VT100/xterm Emulation)
  36         VT_INMODE_TEXT32,       // UTF-32 Text Mode (Acess Native)
  37         NUM_VT_INMODES
  38 };
  39
  40 // === TYPES ===
  41 typedef struct {
  42          int    Mode;   //!< Current Mode (see ::eTplTerminal_Modes)
  43          int    Flags;  //!< Flags (see VT_FLAG_*)
  44
  45         short   NewWidth;       //!< Un-applied dimensions (Width)
  46         short   NewHeight;      //!< Un-applied dimensions (Height)
  47         short   Width;  //!< Virtual Width
  48         short   Height; //!< Virtual Height
  49         short   TextWidth;      //!< Text Virtual Width
  50         short   TextHeight;     //!< Text Virtual Height
  51
  52         Uint32  CurColour;      //!< Current Text Colour
  53
  54          int    ViewPos;        //!< View Buffer Offset (Text Only)
  55          int    WritePos;       //!< Write Buffer Offset (Text Only)
  56         tVT_Char        *Text;
  57
  58         tVT_Char        *AltBuf;        //!< Alternate Screen Buffer
  59          int    AltWritePos;    //!< Alternate write position
  60         short   ScrollTop;      //!< Top of scrolling region (smallest)
  61         short   ScrollHeight;   //!< Length of scrolling region
  62
  63         tMutex  ReadingLock;    //!< Lock the VTerm when a process is reading from it
  64         tTID    ReadingThread;  //!< Owner of the lock
  65          int    InputRead;      //!< Input buffer read position
  66          int    InputWrite;     //!< Input buffer write position
  67         char    InputBuffer[MAX_INPUT_CHARS8];
  68 //      tSemaphore      InputSemaphore;
  69
  70         Uint32          *Buffer;
  71
  72         char    Name[2];        //!< Name of the terminal
  73         tVFS_Node       Node;
  74 } tVTerm;
  75
  76 // === IMPORTS ===
  77 extern void     Debug_SetKTerminal(const char *File);
  78
  79 // === PROTOTYPES ===
  80  int    VT_Install(char **Arguments);
  81 void    VT_InitOutput(void);
  82 void    VT_InitInput(void);
  83 char    *VT_ReadDir(tVFS_Node *Node, int Pos);
  84 tVFS_Node       *VT_FindDir(tVFS_Node *Node, const char *Name);
  85  int    VT_Root_IOCtl(tVFS_Node *Node, int Id, void *Data);
  86 Uint64  VT_Read(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer);
  87 Uint64  VT_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer);
  88  int    VT_Terminal_IOCtl(tVFS_Node *Node, int Id, void *Data);
  89 void    VT_SetResolution(int Width, int Height);
  90 void    VT_SetMode(int Mode);
  91 void    VT_SetTerminal(int ID);
  92 void    VT_KBCallBack(Uint32 Codepoint);
  93 void    VT_int_PutString(tVTerm *Term, Uint8 *Buffer, Uint Count);
  94 void    VT_int_ClearLine(tVTerm *Term, int Num);
  95  int    VT_int_ParseEscape(tVTerm *Term, char *Buffer);
  96 void    VT_int_PutChar(tVTerm *Term, Uint32 Ch);
  97 void    VT_int_ScrollText(tVTerm *Term, int Count);
  98 void    VT_int_ScrollFramebuffer( tVTerm *Term, int Count );
  99 void    VT_int_UpdateScreen( tVTerm *Term, int UpdateAll );
 100 void    VT_int_ChangeMode(tVTerm *Term, int NewMode, int NewWidth, int NewHeight);
 101 void    VT_int_ToggleAltBuffer(tVTerm *Term, int Enabled);
 102
 103 // === CONSTANTS ===
 104 const Uint16    caVT100Colours[] = {
 105                 // Black, Red, Green, Yellow, Blue, Purple, Cyan, Gray
 106                 // Same again, but bright
 107                 VT_COL_BLACK, 0x700, 0x070, 0x770, 0x007, 0x707, 0x077, 0xAAA,
 108                 VT_COL_GREY, 0xF00, 0x0F0, 0xFF0, 0x00F, 0xF0F, 0x0FF, VT_COL_WHITE
 109         };
 110
 111 // === GLOBALS ===
 112 MODULE_DEFINE(0, VERSION, VTerm, VT_Install, NULL, DEFAULT_OUTPUT, DEFAULT_INPUT, NULL);
 113 tDevFS_Driver   gVT_DrvInfo = {
 114         NULL, "VTerm",
 115         {
 116         .Flags = VFS_FFLAG_DIRECTORY,
 117         .Size = NUM_VTS,
 118         .Inode = -1,
 119         .NumACLs = 0,
 120         .ReadDir = VT_ReadDir,
 121         .FindDir = VT_FindDir,
 122         .IOCtl = VT_Root_IOCtl
 123         }
 124 };
 125 // --- Terminals ---
 126 tVTerm  gVT_Terminals[NUM_VTS];
 127  int    giVT_CurrentTerminal = 0;
 128 tVTerm  *gpVT_CurTerm = &gVT_Terminals[0];
 129 // --- Video State ---
 130 short   giVT_RealWidth  = DEFAULT_WIDTH;        //!< Screen Width
 131 short   giVT_RealHeight = DEFAULT_HEIGHT;       //!< Screen Height
 132  int    giVT_Scrollback = DEFAULT_SCROLLBACK;
 133 // --- Driver Handles ---
 134 char    *gsVT_OutputDevice = NULL;
 135 char    *gsVT_InputDevice = NULL;
 136  int    giVT_OutputDevHandle = -2;
 137  int    giVT_InputDevHandle = -2;
 138 // --- Key States --- (Used for VT Switching/Magic Combos)
 139  int    gbVT_CtrlDown = 0;
 140  int    gbVT_AltDown = 0;
 141  int    gbVT_SysrqDown = 0;
 142
 143 // === CODE ===
 144 /**
 145  * \fn int VT_Install(char **Arguments)
 146  * \brief Installs the Virtual Terminal Driver
 147  */
 148 int VT_Install(char **Arguments)
 149 {
 150          int    i;
 151
 152         // Scan Arguments
 153         if(Arguments)
 154         {
 155                 char    **args;
 156                 const char      *arg;
 157                 for(args = Arguments; (arg = *args); args++ )
 158                 {
 159                         char    data[strlen(arg)+1];
 160                         char    *opt = data;
 161                         char    *val;
 162
 163                         val = strchr(arg, '=');
 164                         strcpy(data, arg);
 165                         if( val ) {
 166                                 data[ val - arg ] = '\0';
 167                                 val ++;
 168                         }
 169                         Log_Debug("VTerm", "Argument '%s'", arg);
 170
 171                         if( strcmp(opt, "Video") == 0 ) {
 172                                 if( !gsVT_OutputDevice && Modules_InitialiseBuiltin( val ) == 0 )
 173                                         gsVT_OutputDevice = strdup(val);
 174                         }
 175                         else if( strcmp(opt, "Input") == 0 ) {
 176                                 if( !gsVT_InputDevice && Modules_InitialiseBuiltin( val ) == 0 )
 177                                         gsVT_InputDevice = strdup(val);
 178                         }
 179                         else if( strcmp(opt, "Width") == 0 ) {
 180                                 giVT_RealWidth = atoi( val );
 181                         }
 182                         else if( strcmp(opt, "Height") == 0 ) {
 183                                 giVT_RealHeight = atoi( val );
 184                         }
 185                         else if( strcmp(opt, "Scrollback") == 0 ) {
 186                                 giVT_Scrollback = atoi( val );
 187                         }
 188                 }
 189         }
 190
 191         // Apply Defaults
 192         if(!gsVT_OutputDevice)  gsVT_OutputDevice = strdup(DEFAULT_OUTPUT);
 193         if(!gsVT_InputDevice)   gsVT_InputDevice = strdup(DEFAULT_INPUT);
 194
 195         // Create paths
 196         {
 197                 char    *tmp;
 198                 tmp = malloc( 9 + strlen(gsVT_OutputDevice) + 1 );
 199                 strcpy(tmp, "/Devices/");
 200                 strcpy(&tmp[9], gsVT_OutputDevice);
 201                 gsVT_OutputDevice = tmp;
 202                 tmp = malloc( 9 + strlen(gsVT_InputDevice) + 1 );
 203                 strcpy(tmp, "/Devices/");
 204                 strcpy(&tmp[9], gsVT_InputDevice);
 205                 gsVT_InputDevice = tmp;
 206         }
 207
 208         Log_Log("VTerm", "Using '%s' as output", gsVT_OutputDevice);
 209         Log_Log("VTerm", "Using '%s' as input", gsVT_InputDevice);
 210
 211         // Create Nodes
 212         for( i = 0; i < NUM_VTS; i++ )
 213         {
 214                 gVT_Terminals[i].Mode = TERM_MODE_TEXT;
 215                 gVT_Terminals[i].Flags = 0;
 216                 gVT_Terminals[i].CurColour = DEFAULT_COLOUR;
 217                 gVT_Terminals[i].WritePos = 0;
 218                 gVT_Terminals[i].AltWritePos = 0;
 219                 gVT_Terminals[i].ViewPos = 0;
 220                 gVT_Terminals[i].ReadingThread = -1;
 221                 gVT_Terminals[i].ScrollHeight = 0;
 222
 223                 // Initialise
 224                 VT_int_ChangeMode( &gVT_Terminals[i],
 225                         TERM_MODE_TEXT, giVT_RealWidth, giVT_RealHeight );
 226
 227                 gVT_Terminals[i].Name[0] = '0'+i;
 228                 gVT_Terminals[i].Name[1] = '\0';
 229                 gVT_Terminals[i].Node.Inode = i;
 230                 gVT_Terminals[i].Node.ImplPtr = &gVT_Terminals[i];
 231                 gVT_Terminals[i].Node.NumACLs = 0;      // Only root can open virtual terminals
 232
 233                 gVT_Terminals[i].Node.Read = VT_Read;
 234                 gVT_Terminals[i].Node.Write = VT_Write;
 235                 gVT_Terminals[i].Node.IOCtl = VT_Terminal_IOCtl;
 236 //              Semaphore_Init(&gVT_Terminals[i].InputSemaphore, 0, MAX_INPUT_CHARS8, "VTerm", gVT_Terminals[i].Name);
 237         }
 238
 239         // Add to DevFS
 240         DevFS_AddDevice( &gVT_DrvInfo );
 241
 242         VT_InitOutput();
 243         VT_InitInput();
 244
 245         // Set kernel output to VT0
 246         Debug_SetKTerminal("/Devices/VTerm/0");
 247
 248         Log_Log("VTerm", "Returning %i", MODULE_ERR_OK);
 249         return MODULE_ERR_OK;
 250 }
 251
 252 /**
 253  * \fn void VT_InitOutput()
 254  * \brief Initialise Video Output
 255  */
 256 void VT_InitOutput()
 257 {
 258         giVT_OutputDevHandle = VFS_Open(gsVT_OutputDevice, VFS_OPENFLAG_WRITE);
 259         if(giVT_OutputDevHandle == -1) {
 260                 Log_Warning("VTerm", "Oh F**k, I can't open the video device '%s'", gsVT_OutputDevice);
 261                 return ;
 262         }
 263         VT_SetResolution( giVT_RealWidth, giVT_RealHeight );
 264         VT_SetTerminal( 0 );
 265         VT_SetMode( VIDEO_BUFFMT_TEXT );
 266 }
 267
 268 /**
 269  * \fn void VT_InitInput()
 270  * \brief Initialises the input
 271  */
 272 void VT_InitInput()
 273 {
 274         giVT_InputDevHandle = VFS_Open(gsVT_InputDevice, VFS_OPENFLAG_READ);
 275         if(giVT_InputDevHandle == -1) {
 276                 Log_Warning("VTerm", "Can't open the input device '%s'", gsVT_InputDevice);
 277                 return ;
 278         }
 279         VFS_IOCtl(giVT_InputDevHandle, KB_IOCTL_SETCALLBACK, VT_KBCallBack);
 280 }
 281
 282 /**
 283  * \brief Set the video resolution
 284  * \param Width New screen width
 285  * \param Height        New screen height
 286  */
 287 void VT_SetResolution(int Width, int Height)
 288 {
 289         tVideo_IOCtl_Mode       mode = {0};
 290          int    tmp;
 291          int    i;
 292
 293         // Create the video mode
 294         mode.width = Width;
 295         mode.height = Height;
 296         mode.bpp = 32;
 297         mode.flags = 0;
 298
 299         // Set video mode
 300         VFS_IOCtl( giVT_OutputDevHandle, VIDEO_IOCTL_FINDMODE, &mode );
 301         tmp = mode.id;
 302         if( Width != mode.width || Height != mode.height )
 303         {
 304                 Log_Warning("VTerm",
 305                         "Selected resolution (%ix%i is not supported) by the device, using (%ix%i)",
 306                         giVT_RealWidth, giVT_RealHeight,
 307                         mode.width, mode.height
 308                         );
 309         }
 310         VFS_IOCtl( giVT_OutputDevHandle, VIDEO_IOCTL_GETSETMODE, &tmp );
 311
 312         // Resize text terminals if needed
 313         if( giVT_RealWidth != mode.width || giVT_RealHeight != mode.height )
 314         {
 315                  int    newBufSize = (giVT_RealWidth/giVT_CharWidth)
 316                                         *(giVT_RealHeight/giVT_CharHeight)
 317                                         *(giVT_Scrollback+1);
 318                 //tVT_Char      *tmp;
 319                 // Resize the text terminals
 320                 giVT_RealWidth = mode.width;
 321                 giVT_RealHeight = mode.height;
 322                 for( i = 0; i < NUM_VTS; i ++ )
 323                 {
 324                         if( gVT_Terminals[i].Mode != TERM_MODE_TEXT )   continue;
 325
 326                         gVT_Terminals[i].TextWidth = giVT_RealWidth/giVT_CharWidth;
 327                         gVT_Terminals[i].TextHeight = giVT_RealHeight/giVT_CharHeight;
 328
 329                         gVT_Terminals[i].Text = realloc(
 330                                 gVT_Terminals[i].Text,
 331                                 newBufSize*sizeof(tVT_Char)
 332                                 );
 333                 }
 334         }
 335 }
 336
 337 /**
 338  * \brief Set video output buffer mode
 339  */
 340 void VT_SetMode(int Mode)
 341 {
 342         VFS_IOCtl( giVT_OutputDevHandle, VIDEO_IOCTL_SETBUFFORMAT, &Mode );
 343 }
 344
 345 /**
 346  * \fn char *VT_ReadDir(tVFS_Node *Node, int Pos)
 347  * \brief Read from the VTerm Directory
 348  */
 349 char *VT_ReadDir(tVFS_Node *Node, int Pos)
 350 {
 351         if(Pos < 0)     return NULL;
 352         if(Pos >= NUM_VTS)      return NULL;
 353         return strdup( gVT_Terminals[Pos].Name );
 354 }
 355
 356 /**
 357  * \fn tVFS_Node *VT_FindDir(tVFS_Node *Node, const char *Name)
 358  * \brief Find an item in the VTerm directory
 359  * \param Node  Root node
 360  * \param Name  Name (number) of the terminal
 361  */
 362 tVFS_Node *VT_FindDir(tVFS_Node *Node, const char *Name)
 363 {
 364          int    num;
 365
 366         ENTER("pNode sName", Node, Name);
 367
 368         // Open the input and output files if needed
 369         if(giVT_OutputDevHandle == -2)  VT_InitOutput();
 370         if(giVT_InputDevHandle == -2)   VT_InitInput();
 371
 372         // Sanity check name
 373         if(Name[0] < '0' || Name[0] > '9' || Name[1] != '\0') {
 374                 LEAVE('n');
 375                 return NULL;
 376         }
 377         // Get index
 378         num = Name[0] - '0';
 379         if(num >= NUM_VTS) {
 380                 LEAVE('n');
 381                 return NULL;
 382         }
 383         // Return node
 384         LEAVE('p', &gVT_Terminals[num].Node);
 385         return &gVT_Terminals[num].Node;
 386 }
 387
 388 /**
 389  * \fn int VT_Root_IOCtl(tVFS_Node *Node, int Id, void *Data)
 390  * \brief Control the VTerm Driver
 391  */
 392 int VT_Root_IOCtl(tVFS_Node *Node, int Id, void *Data)
 393 {
 394          int    len;
 395         switch(Id)
 396         {
 397         case DRV_IOCTL_TYPE:    return DRV_TYPE_MISC;
 398         case DRV_IOCTL_IDENT:   memcpy(Data, "VT\0\0", 4);      return 0;
 399         case DRV_IOCTL_VERSION: return VERSION;
 400         case DRV_IOCTL_LOOKUP:  return 0;
 401
 402         case 4: // Get Video Driver
 403                 if(Data)        strcpy(Data, gsVT_OutputDevice);
 404                 return strlen(gsVT_OutputDevice);
 405
 406         case 5: // Set Video Driver
 407                 if(!Data)       return -EINVAL;
 408                 if(Threads_GetUID() != 0)       return -EACCES;
 409
 410                 len = strlen(Data);
 411
 412                 // TODO: Check if the string used is a heap string
 413
 414                 free(gsVT_OutputDevice);
 415
 416                 gsVT_OutputDevice = malloc(len+1);
 417                 strcpy(gsVT_OutputDevice, Data);
 418
 419                 VFS_Close(giVT_OutputDevHandle);
 420                 giVT_OutputDevHandle = -1;
 421
 422                 VT_InitOutput();
 423                 return 1;
 424         }
 425         return 0;
 426 }
 427
 428 /**
 429  * \fn Uint64 VT_Read(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
 430  * \brief Read from a virtual terminal
 431  */
 432 Uint64 VT_Read(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
 433 {
 434          int    pos = 0;
 435          int    avail;
 436         tVTerm  *term = &gVT_Terminals[ Node->Inode ];
 437         Uint32  *codepoint_buf = Buffer;
 438         Uint32  *codepoint_in;
 439
 440         Mutex_Acquire( &term->ReadingLock );
 441
 442         // Check current mode
 443         switch(term->Mode)
 444         {
 445         // Text Mode (UTF-8)
 446         case TERM_MODE_TEXT:
 447                 VFS_SelectNode(Node, VFS_SELECT_READ, NULL, "VT_Read (UTF-8)");
 448
 449                 avail = term->InputWrite - term->InputRead;
 450                 if(avail < 0)
 451                         avail += MAX_INPUT_CHARS8;
 452                 if(avail > Length - pos)
 453                         avail = Length - pos;
 454
 455                 while( avail -- )
 456                 {
 457                         ((char*)Buffer)[pos] = term->InputBuffer[term->InputRead];
 458                         pos ++;
 459                         term->InputRead ++;
 460                         term->InputRead %= MAX_INPUT_CHARS8;
 461                 }
 462                 break;
 463
 464         //case TERM_MODE_FB:
 465         // Other - UCS-4
 466         default:
 467                 VFS_SelectNode(Node, VFS_SELECT_READ, NULL, "VT_Read (UCS-4)");
 468
 469                 avail = term->InputWrite - term->InputRead;
 470                 if(avail < 0)
 471                         avail += MAX_INPUT_CHARS32;
 472                 if(avail > Length - pos)
 473                         avail = Length/4 - pos;
 474
 475                 codepoint_in = (void*)term->InputBuffer;
 476                 codepoint_buf = Buffer;
 477
 478                 while( avail -- )
 479                 {
 480                         codepoint_buf[pos] = codepoint_in[term->InputRead];
 481                         pos ++;
 482                         term->InputRead ++;
 483                         term->InputRead %= MAX_INPUT_CHARS32;
 484                 }
 485                 pos *= 4;
 486                 break;
 487         }
 488
 489         // Mark none avaliable if buffer empty
 490         if( term->InputRead == term->InputWrite )
 491                 VFS_MarkAvaliable(&term->Node, 0);
 492
 493         term->ReadingThread = -1;
 494
 495         Mutex_Release( &term->ReadingLock );
 496
 497         return pos;
 498 }
 499
 500 /**
 501  * \fn Uint64 VT_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
 502  * \brief Write to a virtual terminal
 503  */
 504 Uint64 VT_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
 505 {
 506         tVTerm  *term = &gVT_Terminals[ Node->Inode ];
 507          int    size;
 508
 509         // Write
 510         switch( term->Mode )
 511         {
 512         // Print Text
 513         case TERM_MODE_TEXT:
 514                 VT_int_PutString(term, Buffer, Length);
 515                 break;
 516         // Framebuffer :)
 517         case TERM_MODE_FB:
 518
 519                 // - Sanity Checking
 520                 size = term->Width*term->Height*4;
 521                 if( Offset > size ) {
 522                         Log_Notice("VTerm", "VT_Write: Offset (0x%llx) > FBSize (0x%x)",
 523                                 Offset, size);
 524                         return 0;
 525                 }
 526                 if( Offset + Length > size ) {
 527                         Log_Notice("VTerm", "VT_Write: Offset+Length (0x%llx) > FBSize (0x%x)",
 528                                 Offset+Length, size);
 529                         Length = size - Offset;
 530                 }
 531
 532                 // Copy to the local cache
 533                 memcpy( (void*)((Uint)term->Buffer + (Uint)Offset), Buffer, Length );
 534
 535                 // Update screen if needed
 536                 if( Node->Inode == giVT_CurrentTerminal )
 537                 {
 538                         // Fill entire screen?
 539                         if( giVT_RealWidth > term->Width || giVT_RealHeight > term->Height )
 540                         {
 541                                 // No? :( Well, just center it
 542                                  int    x, y, w, h;
 543                                 x = Offset/4;   y = x / term->Width;    x %= term->Width;
 544                                 w = Length/4+x; h = w / term->Width;    w %= term->Width;
 545                                 // Center
 546                                 x += (giVT_RealWidth - term->Width) / 2;
 547                                 y += (giVT_RealHeight - term->Height) / 2;
 548                                 while(h--)
 549                                 {
 550                                         VFS_WriteAt( giVT_OutputDevHandle,
 551                                                 (x + y * giVT_RealWidth)*4,
 552                                                 term->Width * 4,
 553                                                 Buffer
 554                                                 );
 555                                         Buffer = (void*)( (Uint)Buffer + term->Width*4 );
 556                                         y ++;
 557                                 }
 558                                 return 0;
 559                         }
 560                         else {
 561                                 return VFS_WriteAt( giVT_OutputDevHandle, Offset, Length, Buffer );
 562                         }
 563                 }
 564         // Just pass on (for now)
 565         // TODO: Handle locally too to ensure no information is lost on
 566         //       VT Switch (and to isolate terminals from each other)
 567         case TERM_MODE_2DACCEL:
 568         //case TERM_MODE_3DACCEL:
 569                 if( Node->Inode == giVT_CurrentTerminal )
 570                 {
 571                         VFS_Write( giVT_OutputDevHandle, Length, Buffer );
 572                 }
 573                 break;
 574         }
 575
 576         return 0;
 577 }
 578
 579 /**
 580  * \fn int VT_Terminal_IOCtl(tVFS_Node *Node, int Id, void *Data)
 581  * \brief Call an IO Control on a virtual terminal
 582  */
 583 int VT_Terminal_IOCtl(tVFS_Node *Node, int Id, void *Data)
 584 {
 585          int    *iData = Data;
 586          int    ret;
 587         tVTerm  *term = Node->ImplPtr;
 588         ENTER("pNode iId pData", Node, Id, Data);
 589
 590         if(Id >= DRV_IOCTL_LOOKUP) {
 591                 // Only root can fiddle with graphics modes
 592                 // TODO: Remove this and replace with user ownership
 593                 if( Threads_GetUID() != 0 )     return -1;
 594         }
 595
 596         switch(Id)
 597         {
 598         // --- Core Defined
 599         case DRV_IOCTL_TYPE:
 600                 LEAVE('i', DRV_TYPE_TERMINAL);
 601                 return DRV_TYPE_TERMINAL;
 602         case DRV_IOCTL_IDENT:
 603                 memcpy(Data, "VT\0\0", 4);
 604                 LEAVE('i', 0);
 605                 return 0;
 606         case DRV_IOCTL_VERSION:
 607                 LEAVE('x', VERSION);
 608                 return VERSION;
 609         case DRV_IOCTL_LOOKUP:
 610                 LEAVE('i', 0);
 611                 return 0;
 612
 613         // Get/Set the mode (and apply any changes)
 614         case TERM_IOCTL_MODETYPE:
 615                 if(Data != NULL)
 616                 {
 617                         if( CheckMem(Data, sizeof(int)) == 0 ) {
 618                                 LEAVE('i', -1);
 619                                 return -1;
 620                         }
 621                         Log_Log("VTerm", "VTerm %i mode set to %i", (int)Node->Inode, *iData);
 622
 623                         // Update mode if needed
 624                         if( term->Mode != *iData
 625                          || term->NewWidth
 626                          || term->NewHeight)
 627                         {
 628                                 // Adjust for text mode
 629                                 if( *iData == TERM_MODE_TEXT ) {
 630                                         term->NewHeight *= giVT_CharHeight;
 631                                         term->NewWidth *= giVT_CharWidth;
 632                                 }
 633                                 // Fill unchanged dimensions
 634                                 if(term->NewHeight == 0)        term->NewHeight = term->Height;
 635                                 if(term->NewWidth == 0) term->NewWidth = term->Width;
 636                                 // Set new mode
 637                                 VT_int_ChangeMode(term, *iData, term->NewWidth, term->NewHeight);
 638                                 // Clear unapplied dimensions
 639                                 term->NewWidth = 0;
 640                                 term->NewHeight = 0;
 641                         }
 642
 643                         // Update the screen dimensions
 644                         if(Node->Inode == giVT_CurrentTerminal)
 645                                 VT_SetTerminal( giVT_CurrentTerminal );
 646                 }
 647                 LEAVE('i', term->Mode);
 648                 return term->Mode;
 649
 650         // Get/set the terminal width
 651         case TERM_IOCTL_WIDTH:
 652                 if(Data != NULL) {
 653                         if( CheckMem(Data, sizeof(int)) == 0 ) {
 654                                 LEAVE('i', -1);
 655                                 return -1;
 656                         }
 657                         term->NewWidth = *iData;
 658                 }
 659                 if( term->NewWidth )
 660                         ret = term->NewWidth;
 661                 else if( term->Mode == TERM_MODE_TEXT )
 662                         ret = term->TextWidth;
 663                 else
 664                         ret = term->Width;
 665                 LEAVE('i', ret);
 666                 return ret;
 667
 668         // Get/set the terminal height
 669         case TERM_IOCTL_HEIGHT:
 670                 if(Data != NULL) {
 671                         if( CheckMem(Data, sizeof(int)) == 0 ) {
 672                                 LEAVE('i', -1);
 673                                 return -1;
 674                         }
 675                         term->NewHeight = *iData;
 676                 }
 677                 if( term->NewHeight )
 678                         ret = term->NewHeight;
 679                 else if( term->Mode == TERM_MODE_TEXT )
 680                         ret = term->TextHeight;
 681                 else
 682                         ret = term->Height;
 683                 LEAVE('i', ret);
 684                 return ret;
 685
 686         case TERM_IOCTL_FORCESHOW:
 687                 Log_Log("VTerm", "Thread %i forced VTerm %i to be shown",
 688                         Threads_GetTID(), (int)Node->Inode);
 689                 VT_SetTerminal( Node->Inode );
 690                 LEAVE('i', 1);
 691                 return 1;
 692
 693         case TERM_IOCTL_GETCURSOR:
 694                 ret = (term->Flags & VT_FLAG_ALTBUF) ? term->AltWritePos : term->WritePos-term->ViewPos;
 695                 LEAVE('i', ret);
 696                 return ret;
 697         }
 698         LEAVE('i', -1);
 699         return -1;
 700 }
 701
 702 /**
 703  * \fn void VT_SetTerminal(int ID)
 704  * \brief Set the current terminal
 705  */
 706 void VT_SetTerminal(int ID)
 707 {
 708         // Update current terminal ID
 709         Log_Log("VTerm", "Changed terminal from %i to %i", giVT_CurrentTerminal, ID);
 710         giVT_CurrentTerminal = ID;
 711         gpVT_CurTerm = &gVT_Terminals[ID];
 712
 713         // Update cursor
 714         if( gpVT_CurTerm->Mode == TERM_MODE_TEXT && !(gpVT_CurTerm->Flags & VT_FLAG_HIDECSR) )
 715         {
 716                 tVideo_IOCtl_Pos        pos;
 717                  int    offset = (gpVT_CurTerm->Flags & VT_FLAG_ALTBUF) ? gpVT_CurTerm->AltWritePos : gpVT_CurTerm->WritePos - gpVT_CurTerm->ViewPos;
 718                 pos.x = offset % gpVT_CurTerm->TextWidth;
 719                 pos.y = offset / gpVT_CurTerm->TextWidth;
 720                 if( 0 <= pos.y && pos.y < gpVT_CurTerm->TextHeight )
 721                         VFS_IOCtl(giVT_OutputDevHandle, VIDEO_IOCTL_SETCURSOR, &pos);
 722         }
 723
 724         if( gpVT_CurTerm->Mode == TERM_MODE_TEXT )
 725                 VT_SetMode( VIDEO_BUFFMT_TEXT );
 726         else
 727                 VT_SetMode( VIDEO_BUFFMT_FRAMEBUFFER );
 728
 729         // Update the screen
 730         VT_int_UpdateScreen( &gVT_Terminals[ ID ], 1 );
 731 }
 732
 733 /**
 734  * \fn void VT_KBCallBack(Uint32 Codepoint)
 735  * \brief Called on keyboard interrupt
 736  * \param Codepoint     Pseudo-UTF32 character
 737  *
 738  * Handles a key press and sends the key code to the user's buffer.
 739  * If the code creates a kernel-magic sequence, it is not passed to the
 740  * user and is handled in-kernel.
 741  */
 742 void VT_KBCallBack(Uint32 Codepoint)
 743 {
 744         tVTerm  *term = gpVT_CurTerm;
 745
 746         // How the hell did we get a codepoint of zero?
 747         if(Codepoint == 0)      return;
 748
 749         // Key Up
 750         if( Codepoint & 0x80000000 )
 751         {
 752                 Codepoint &= 0x7FFFFFFF;
 753                 switch(Codepoint)
 754                 {
 755                 #if !USE_CTRL_ALT
 756                 case KEY_RSHIFT:        gbVT_CtrlDown = 0;      break;
 757                 case KEY_LSHIFT:        gbVT_AltDown = 0;       break;
 758                 #else
 759                 case KEY_LALT:  gbVT_AltDown &= ~1;     break;
 760                 case KEY_RALT:  gbVT_AltDown &= ~2;     break;
 761                 case KEY_LCTRL: gbVT_CtrlDown &= ~1;    break;
 762                 case KEY_RCTRL: gbVT_CtrlDown &= ~2;    break;
 763                 #endif
 764                 }
 765                 return;
 766         }
 767
 768         switch(Codepoint)
 769         {
 770         #if !USE_CTRL_ALT       // HACK: Use both shifts instead of Ctrl-Alt
 771         case KEY_RSHIFT:        gbVT_CtrlDown = 1;      break;
 772         case KEY_LSHIFT:        gbVT_AltDown = 1;       break;
 773         #else
 774         case KEY_LALT:  gbVT_AltDown |= 1;      break;
 775         case KEY_RALT:  gbVT_AltDown |= 2;      break;
 776         case KEY_LCTRL: gbVT_CtrlDown |= 1;     break;
 777         case KEY_RCTRL: gbVT_CtrlDown |= 2;     break;
 778         #endif
 779
 780         default:
 781                 if(!gbVT_AltDown || !gbVT_CtrlDown)
 782                         break;
 783                 switch(Codepoint)
 784                 {
 785                 case KEY_F1:    VT_SetTerminal(0);      return;
 786                 case KEY_F2:    VT_SetTerminal(1);      return;
 787                 case KEY_F3:    VT_SetTerminal(2);      return;
 788                 case KEY_F4:    VT_SetTerminal(3);      return;
 789                 case KEY_F5:    VT_SetTerminal(4);      return;
 790                 case KEY_F6:    VT_SetTerminal(5);      return;
 791                 case KEY_F7:    VT_SetTerminal(6);      return;
 792                 case KEY_F8:    VT_SetTerminal(7);      return;
 793                 case KEY_F9:    VT_SetTerminal(8);      return;
 794                 case KEY_F10:   VT_SetTerminal(9);      return;
 795                 case KEY_F11:   VT_SetTerminal(10);     return;
 796                 case KEY_F12:   VT_SetTerminal(11);     return;
 797                 // Scrolling
 798                 case KEY_PGUP:
 799                         if( gpVT_CurTerm->Flags & VT_FLAG_ALTBUF )
 800                                 return ;
 801                         if( gpVT_CurTerm->ViewPos > gpVT_CurTerm->Width )
 802                                 gpVT_CurTerm->ViewPos -= gpVT_CurTerm->Width;
 803                         else
 804                                 gpVT_CurTerm->ViewPos = 0;
 805                         return;
 806                 case KEY_PGDOWN:
 807                         if( gpVT_CurTerm->Flags & VT_FLAG_ALTBUF )
 808                                 return ;
 809                         if( gpVT_CurTerm->ViewPos < gpVT_CurTerm->Width*gpVT_CurTerm->Height*(giVT_Scrollback-1) )
 810                                 gpVT_CurTerm->ViewPos += gpVT_CurTerm->Width;
 811                         else
 812                                 gpVT_CurTerm->ViewPos = gpVT_CurTerm->Width*gpVT_CurTerm->Height*(giVT_Scrollback-1);
 813                         return;
 814                 }
 815         }
 816
 817         // Encode key
 818         if(term->Mode == TERM_MODE_TEXT)
 819         {
 820                 Uint8   buf[6] = {0};
 821                  int    len = 0;
 822
 823                 // Ignore Modifer Keys
 824                 if(Codepoint > KEY_MODIFIERS)   return;
 825
 826                 // Get UTF-8/ANSI Encoding
 827                 switch(Codepoint)
 828                 {
 829                 case KEY_LEFT:
 830                         buf[0] = '\x1B';        buf[1] = '[';   buf[2] = 'D';
 831                         len = 3;
 832                         break;
 833                 case KEY_RIGHT:
 834                         buf[0] = '\x1B';        buf[1] = '[';   buf[2] = 'C';
 835                         len = 3;
 836                         break;
 837                 case KEY_UP:
 838                         buf[0] = '\x1B';        buf[1] = '[';   buf[2] = 'A';
 839                         len = 3;
 840                         break;
 841                 case KEY_DOWN:
 842                         buf[0] = '\x1B';        buf[1] = '[';   buf[2] = 'B';
 843                         len = 3;
 844                         break;
 845
 846                 case KEY_PGUP:
 847                         //buf[0] = '\x1B';      buf[1] = '[';   buf[2] = '5';   // Some overline also
 848                         //len = 4;      // Commented out until I'm sure
 849                         len = 0;
 850                         break;
 851                 case KEY_PGDOWN:
 852                         len = 0;
 853                         break;
 854
 855                 // Attempt to encode in UTF-8
 856                 default:
 857                         len = WriteUTF8( buf, Codepoint );
 858                         if(len == 0) {
 859                                 Warning("Codepoint (%x) is unrepresentable in UTF-8", Codepoint);
 860                         }
 861                         break;
 862                 }
 863
 864                 if(len == 0) {
 865                         // Unprintable / Don't Pass
 866                         return;
 867                 }
 868
 869                 // Write
 870                 if( MAX_INPUT_CHARS8 - term->InputWrite >= len )
 871                         memcpy( &term->InputBuffer[term->InputWrite], buf, len );
 872                 else {
 873                         memcpy( &term->InputBuffer[term->InputWrite], buf, MAX_INPUT_CHARS8 - term->InputWrite );
 874                         memcpy( &term->InputBuffer[0], buf, len - (MAX_INPUT_CHARS8 - term->InputWrite) );
 875                 }
 876                 // Roll the buffer over
 877                 term->InputWrite += len;
 878                 term->InputWrite %= MAX_INPUT_CHARS8;
 879                 if( (term->InputWrite - term->InputRead + MAX_INPUT_CHARS8)%MAX_INPUT_CHARS8 < len ) {
 880                         term->InputRead = term->InputWrite + 1;
 881                         term->InputRead %= MAX_INPUT_CHARS8;
 882                 }
 883         }
 884         else
 885         {
 886                 // Encode the raw UTF-32 Key
 887                 Uint32  *raw_in = (void*)term->InputBuffer;
 888                 raw_in[ term->InputWrite ] = Codepoint;
 889                 term->InputWrite ++;
 890                 term->InputWrite %= MAX_INPUT_CHARS32;
 891                 if(term->InputRead == term->InputWrite) {
 892                         term->InputRead ++;
 893                         term->InputRead %= MAX_INPUT_CHARS32;
 894                 }
 895         }
 896
 897         VFS_MarkAvaliable(&term->Node, 1);
 898
 899         // Wake up the thread waiting on us
 900         //if( term->ReadingThread >= 0 ) {
 901         //      Threads_WakeTID(term->ReadingThread);
 902         //}
 903 }
 904
 905 /**
 906  * \fn void VT_int_ClearLine(tVTerm *Term, int Num)
 907  * \brief Clears a line in a virtual terminal
 908  */
 909 void VT_int_ClearLine(tVTerm *Term, int Num)
 910 {
 911          int    i;
 912         tVT_Char        *cell;
 913
 914         if( Num < 0 || Num >= Term->TextHeight * (giVT_Scrollback + 1) )        return ;
 915
 916         cell = (Term->Flags & VT_FLAG_ALTBUF) ? Term->AltBuf : Term->Text;
 917         cell = &cell[ Num*Term->TextWidth ];
 918
 919         for( i = Term->TextWidth; i--; )
 920         {
 921                 cell[ i ].Ch = 0;
 922                 cell[ i ].Colour = Term->CurColour;
 923         }
 924 }
 925
 926 /**
 927  * \fn int VT_int_ParseEscape(tVTerm *Term, char *Buffer)
 928  * \brief Parses a VT100 Escape code
 929  */
 930 int VT_int_ParseEscape(tVTerm *Term, char *Buffer)
 931 {
 932         char    c;
 933          int    argc = 0, j = 1;
 934          int    tmp;
 935          int    args[6] = {0,0,0,0};
 936          int    bQuestionMark = 0;
 937
 938         switch(Buffer[0])
 939         {
 940         //Large Code
 941         case '[':
 942                 // Get Arguments
 943                 c = Buffer[j++];
 944                 if(c == '?') {
 945                         bQuestionMark = 1;
 946                         c = Buffer[j++];
 947                 }
 948                 if( '0' <= c && c <= '9' )
 949                 {
 950                         do {
 951                                 if(c == ';')    c = Buffer[j++];
 952                                 while('0' <= c && c <= '9') {
 953                                         args[argc] *= 10;
 954                                         args[argc] += c-'0';
 955                                         c = Buffer[j++];
 956                                 }
 957                                 argc ++;
 958                         } while(c == ';');
 959                 }
 960
 961                 // Get Command
 962                 if(     ('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z'))
 963                 {
 964                         if( bQuestionMark )
 965                         {
 966                                 switch(c)
 967                                 {
 968                                 // DEC Private Mode Set
 969                                 case 'h':
 970                                         if(argc != 1)   break;
 971                                         switch(args[0])
 972                                         {
 973                                         case 1047:
 974                                                 VT_int_ToggleAltBuffer(Term, 1);
 975                                                 break;
 976                                         }
 977                                         break;
 978                                 case 'l':
 979                                         if(argc != 1)   break;
 980                                         switch(args[0])
 981                                         {
 982                                         case 1047:
 983                                                 VT_int_ToggleAltBuffer(Term, 0);
 984                                                 break;
 985                                         }
 986                                         break;
 987                                 }
 988                         }
 989                         else
 990                         {
 991                                 tmp = 1;
 992                                 switch(c)
 993                                 {
 994                                 // Left
 995                                 case 'D':
 996                                         tmp = -1;
 997                                 // Right
 998                                 case 'C':
 999                                         if(argc == 1)   tmp *= args[0];
1000                                         if( Term->Flags & VT_FLAG_ALTBUF )
1001                                         {
1002                                                 if( (Term->AltWritePos + tmp) % Term->TextWidth == 0 ) {
1003                                                         Term->AltWritePos -= Term->AltWritePos % Term->TextWidth;
1004                                                         Term->AltWritePos += Term->TextWidth - 1;
1005                                                 }
1006                                                 else
1007                                                         Term->AltWritePos += tmp;
1008                                         }
1009                                         else
1010                                         {
1011                                                 if( (Term->WritePos + tmp) % Term->TextWidth == 0 ) {
1012                                                         Term->WritePos -= Term->WritePos % Term->TextWidth;
1013                                                         Term->WritePos += Term->TextWidth - 1;
1014                                                 }
1015                                                 else
1016                                                         Term->WritePos += tmp;
1017                                         }
1018                                         break;
1019
1020                                 // Erase
1021                                 case 'J':
1022                                         switch(args[0])
1023                                         {
1024                                         case 0: // Erase below
1025                                                 break;
1026                                         case 1: // Erase above
1027                                                 break;
1028                                         case 2: // Erase all
1029                                                 if( Term->Flags & VT_FLAG_ALTBUF )
1030                                                 {
1031                                                          int    i = Term->TextHeight;
1032                                                         while( i-- )    VT_int_ClearLine(Term, i);
1033                                                         Term->AltWritePos = 0;
1034                                                         VT_int_UpdateScreen(Term, 1);
1035                                                 }
1036                                                 else
1037                                                 {
1038                                                          int    i = Term->TextHeight * (giVT_Scrollback + 1);
1039                                                         while( i-- )    VT_int_ClearLine(Term, i);
1040                                                         Term->WritePos = 0;
1041                                                         Term->ViewPos = 0;
1042                                                         VT_int_UpdateScreen(Term, 1);
1043                                                 }
1044                                                 break;
1045                                         }
1046                                         break;
1047                                 // Set cursor position
1048                                 case 'H':
1049                                         if( Term->Flags & VT_FLAG_ALTBUF )
1050                                                 Term->AltWritePos = args[0] + args[1]*Term->TextWidth;
1051                                         else
1052                                                 Term->WritePos = args[0] + args[1]*Term->TextWidth;
1053                                         Log_Debug("VTerm", "args = {%i, %i}", args[0], args[1]);
1054                                         break;
1055
1056                                 // Scroll up `n` lines
1057                                 case 'S':
1058                                         tmp = -1;
1059                                 // Scroll down `n` lines
1060                                 case 'P':
1061                                         if(argc == 1)   tmp *= args[0];
1062
1063                                         break;
1064
1065                                 // Set Font flags
1066                                 case 'm':
1067                                         for( ; argc--; )
1068                                         {
1069                                                 // Flags
1070                                                 if( 0 <= args[argc] && args[argc] <= 8)
1071                                                 {
1072                                                         switch(args[argc])
1073                                                         {
1074                                                         case 0: Term->CurColour = DEFAULT_COLOUR;       break;  // Reset
1075                                                         case 1: Term->CurColour |= 0x80000000;  break;  // Bright
1076                                                         case 2: Term->CurColour &= ~0x80000000; break;  // Dim
1077                                                         }
1078                                                 }
1079                                                 // Foreground Colour
1080                                                 else if(30 <= args[argc] && args[argc] <= 37) {
1081                                                         Term->CurColour &= 0xF000FFFF;
1082                                                         Term->CurColour |= (Uint32)caVT100Colours[ args[argc]-30+(Term->CurColour>>28) ] << 16;
1083                                                 }
1084                                                 // Background Colour
1085                                                 else if(40 <= args[argc] && args[argc] <= 47) {
1086                                                         Term->CurColour &= 0xFFFF8000;
1087                                                         Term->CurColour |= caVT100Colours[ args[argc]-40+((Term->CurColour>>12)&15) ];
1088                                                 }
1089                                         }
1090                                         break;
1091
1092                                 // Set scrolling region
1093                                 case 'r':
1094                                         if( argc != 2 ) break;
1095                                         Term->ScrollTop = args[0];
1096                                         Term->ScrollHeight = args[1] - args[0];
1097                                         break;
1098
1099                                 default:
1100                                         Log_Warning("VTerm", "Unknown control sequence");
1101                                         break;
1102                                 }
1103                         }
1104                 }
1105                 break;
1106
1107         default:        break;
1108         }
1109
1110         //Log_Debug("VTerm", "j = %i, Buffer = '%s'", j, Buffer);
1111         return j;
1112 }
1113
1114 /**
1115  * \fn void VT_int_PutString(tVTerm *Term, Uint8 *Buffer, Uint Count)
1116  * \brief Print a string to the Virtual Terminal
1117  */
1118 void VT_int_PutString(tVTerm *Term, Uint8 *Buffer, Uint Count)
1119 {
1120         Uint32  val;
1121          int    i;
1122
1123         // Iterate
1124         for( i = 0; i < Count; i++ )
1125         {
1126                 // Handle escape sequences
1127                 if( Buffer[i] == 0x1B )
1128                 {
1129                         i ++;
1130                         i += VT_int_ParseEscape(Term, (char*)&Buffer[i]) - 1;
1131                         continue;
1132                 }
1133
1134                 // Fast check for non UTF-8
1135                 if( Buffer[i] < 128 )   // Plain ASCII
1136                         VT_int_PutChar(Term, Buffer[i]);
1137                 else {  // UTF-8
1138                         i += ReadUTF8(&Buffer[i], &val) - 1;
1139                         VT_int_PutChar(Term, val);
1140                 }
1141         }
1142         // Update Screen
1143         VT_int_UpdateScreen( Term, 0 );
1144
1145         // Update cursor
1146         if( Term == gpVT_CurTerm && !(Term->Flags & VT_FLAG_HIDECSR) )
1147         {
1148                 tVideo_IOCtl_Pos        pos;
1149                  int    offset = (gpVT_CurTerm->Flags & VT_FLAG_ALTBUF) ? gpVT_CurTerm->AltWritePos : gpVT_CurTerm->WritePos - gpVT_CurTerm->ViewPos;
1150                 pos.x = offset % gpVT_CurTerm->TextWidth;
1151                 pos.y = offset / gpVT_CurTerm->TextWidth;
1152                 if( 0 <= pos.y && pos.y < gpVT_CurTerm->TextHeight )
1153                         VFS_IOCtl(giVT_OutputDevHandle, VIDEO_IOCTL_SETCURSOR, &pos);
1154         }
1155 }
1156
1157 /**
1158  * \fn void VT_int_PutChar(tVTerm *Term, Uint32 Ch)
1159  * \brief Write a single character to a VTerm
1160  */
1161 void VT_int_PutChar(tVTerm *Term, Uint32 Ch)
1162 {
1163          int    i;
1164         tVT_Char        *buffer;
1165          int    write_pos;
1166
1167         if(Term->Flags & VT_FLAG_ALTBUF) {
1168                 buffer = Term->AltBuf;
1169                 write_pos = Term->AltWritePos;
1170         }
1171         else {
1172                 buffer = Term->Text;
1173                 write_pos = Term->WritePos;
1174         }
1175
1176         switch(Ch)
1177         {
1178         case '\0':      return; // Ignore NULL byte
1179         case '\n':
1180                 VT_int_UpdateScreen( Term, 0 ); // Update the line before newlining
1181                 write_pos += Term->TextWidth;
1182         case '\r':
1183                 write_pos -= write_pos % Term->TextWidth;
1184                 break;
1185
1186         case '\t':
1187                 do {
1188                         buffer[ write_pos ].Ch = '\0';
1189                         buffer[ write_pos ].Colour = Term->CurColour;
1190                         write_pos ++;
1191                 } while(write_pos & 7);
1192                 break;
1193
1194         case '\b':
1195                 // Backspace is invalid at Offset 0
1196                 if(write_pos == 0)      break;
1197
1198                 write_pos --;
1199                 // Singe Character
1200                 if(buffer[ write_pos ].Ch != '\0') {
1201                         buffer[ write_pos ].Ch = 0;
1202                         buffer[ write_pos ].Colour = Term->CurColour;
1203                         break;
1204                 }
1205                 // Tab
1206                 i = 7;  // Limit it to 8
1207                 do {
1208                         buffer[ write_pos ].Ch = 0;
1209                         buffer[ write_pos ].Colour = Term->CurColour;
1210                         write_pos --;
1211                 } while(write_pos && i-- && buffer[ write_pos ].Ch == '\0');
1212                 if(buffer[ write_pos ].Ch != '\0')
1213                         write_pos ++;
1214                 break;
1215
1216         default:
1217                 buffer[ write_pos ].Ch = Ch;
1218                 buffer[ write_pos ].Colour = Term->CurColour;
1219                 // Update the line before wrapping
1220                 if( (write_pos + 1) % Term->TextWidth == 0 )
1221                         VT_int_UpdateScreen( Term, 0 );
1222                 write_pos ++;
1223                 break;
1224         }
1225
1226         if(Term->Flags & VT_FLAG_ALTBUF)
1227         {
1228                 Term->AltBuf = buffer;
1229                 Term->AltWritePos = write_pos;
1230
1231                 if(Term->AltWritePos >= Term->TextWidth*Term->TextHeight)
1232                 {
1233                         Term->AltWritePos -= Term->TextWidth;
1234                         VT_int_ScrollText(Term, 1);
1235                 }
1236
1237         }
1238         else
1239         {
1240                 Term->Text = buffer;
1241                 Term->WritePos = write_pos;
1242                 // Move Screen
1243                 // - Check if we need to scroll the entire scrollback buffer
1244                 if(Term->WritePos >= Term->TextWidth*Term->TextHeight*(giVT_Scrollback+1))
1245                 {
1246                          int    base;
1247
1248                         // Update previous line
1249                         Term->WritePos -= Term->TextWidth;
1250                         VT_int_UpdateScreen( Term, 0 );
1251
1252                         // Update view position
1253                         base = Term->TextWidth*Term->TextHeight*(giVT_Scrollback);
1254                         if(Term->ViewPos < base)
1255                                 Term->ViewPos += Term->Width;
1256                         if(Term->ViewPos > base)
1257                                 Term->ViewPos = base;
1258
1259                         VT_int_ScrollText(Term, 1);
1260                 }
1261                 // Ok, so we only need to scroll the screen
1262                 else if(Term->WritePos >= Term->ViewPos + Term->TextWidth*Term->TextHeight)
1263                 {
1264                         // Update the last line
1265                         Term->WritePos -= Term->TextWidth;
1266                         VT_int_UpdateScreen( Term, 0 );
1267
1268                         VT_int_ScrollText(Term, 1);
1269                 }
1270         }
1271
1272         //LEAVE('-');
1273 }
1274
1275 void VT_int_ScrollText(tVTerm *Term, int Count)
1276 {
1277         tVT_Char        *buf;
1278          int    height, init_write_pos;
1279          int    base, len, i;
1280
1281         if( Term->Flags & VT_FLAG_ALTBUF )
1282         {
1283                 buf = Term->AltBuf;
1284                 height = Term->TextHeight;
1285                 init_write_pos = Term->AltWritePos;
1286         }
1287         else
1288         {
1289                 buf = Term->Text;
1290                 height = Term->TextHeight*giVT_Scrollback;
1291                 init_write_pos = Term->WritePos;
1292         }
1293
1294         if( Count > 0 )
1295         {
1296                 if(Count > Term->ScrollHeight)  Count = Term->ScrollHeight;
1297                 base = Term->TextWidth*(Term->ScrollTop + Term->ScrollHeight - Count);
1298                 len = Term->TextWidth*(height - Term->ScrollHeight - Count - Term->ScrollTop);
1299
1300                 // Scroll terminal cache
1301                 memcpy(
1302                         &buf[Term->TextWidth*Term->ScrollTop],
1303                         &buf[Term->TextWidth*(Term->ScrollTop+Count)],
1304                         len*sizeof(tVT_Char)
1305                         );
1306                 // Clear last rows
1307                 for( i = 0; i < Term->TextWidth*Count; i ++ )
1308                 {
1309                         Term->AltBuf[ base + i ].Ch = 0;
1310                         Term->AltBuf[ base + i ].Colour = Term->CurColour;
1311                 }
1312
1313                 // Update Screen
1314                 VT_int_ScrollFramebuffer( Term, Count );
1315                 Term->WritePos = Term->ViewPos + Term->ScrollTop + (Term->ScrollHeight - Count);
1316                 for( i = 0; i < Count; i ++ )
1317                 {
1318                         VT_int_UpdateScreen( Term, 0 );
1319                         if( Term->Flags & VT_FLAG_ALTBUF )
1320                                 Term->AltWritePos += Term->TextWidth;
1321                         else
1322                                 Term->WritePos += Term->TextWidth;
1323                 }
1324         }
1325         else
1326         {
1327                 Count = -Count;
1328                 if(Count > Term->ScrollHeight)  Count = Term->ScrollHeight;
1329
1330                 len = Term->TextWidth*(height - Term->ScrollHeight - Count - Term->ScrollTop);
1331
1332                 // Scroll terminal cache
1333                 memcpy(
1334                         &buf[Term->TextWidth*(Term->ScrollTop+Count)],
1335                         &buf[Term->TextWidth*Term->ScrollTop],
1336                         len*sizeof(tVT_Char)
1337                         );
1338                 // Clear preceding rows
1339                 for( i = 0; i < Term->TextWidth*Count; i ++ )
1340                 {
1341                         Term->AltBuf[ i ].Ch = 0;
1342                         Term->AltBuf[ i ].Colour = Term->CurColour;
1343                 }
1344
1345                 VT_int_ScrollFramebuffer( Term, -Count );
1346                 Term->WritePos = Term->ViewPos + Term->ScrollTop;
1347                 for( i = 0; i < Count; i ++ )
1348                 {
1349                         VT_int_UpdateScreen( Term, 0 );
1350                         if( Term->Flags & VT_FLAG_ALTBUF )
1351                                 Term->AltWritePos += Term->TextWidth;
1352                         else
1353                                 Term->WritePos += Term->TextWidth;
1354                 }
1355         }
1356
1357         if( Term->Flags & VT_FLAG_ALTBUF )
1358                 Term->AltWritePos = init_write_pos;
1359         else
1360                 Term->WritePos = init_write_pos;
1361 }
1362
1363 /**
1364  * \fn void VT_int_ScrollFramebuffer( tVTerm *Term, int Count )
1365  * \note Scrolls the framebuffer down by \a Count text lines
1366  */
1367 void VT_int_ScrollFramebuffer( tVTerm *Term, int Count )
1368 {
1369          int    tmp;
1370         struct {
1371                 Uint8   Op;
1372                 Uint16  DstX, DstY;
1373                 Uint16  SrcX, SrcY;
1374                 Uint16  W, H;
1375         } PACKED        buf;
1376
1377         // Only update if this is the current terminal
1378         if( Term != gpVT_CurTerm )      return;
1379
1380         if( Count > Term->ScrollHeight )        Count = Term->ScrollHeight;
1381         if( Count < -Term->ScrollHeight )       Count = -Term->ScrollHeight;
1382
1383         // Switch to 2D Command Stream
1384         tmp = VIDEO_BUFFMT_2DSTREAM;
1385         VFS_IOCtl(giVT_OutputDevHandle, VIDEO_IOCTL_SETBUFFORMAT, &tmp);
1386
1387         // BLIT to 0,0 from 0,giVT_CharHeight
1388         buf.Op = VIDEO_2DOP_BLIT;
1389         buf.SrcX = 0;   buf.DstX = 0;
1390         buf.W = Term->TextWidth * giVT_CharWidth;
1391         if( Count > 0 )
1392         {
1393                 buf.SrcY = (Term->ScrollTop+Count) * giVT_CharHeight;
1394                 buf.DstY = Term->ScrollTop * giVT_CharHeight;
1395                 buf.H = (Term->ScrollHeight-Count) * giVT_CharHeight;
1396         }
1397         else    // Scroll up, move text down
1398         {
1399                 buf.SrcY = Term->ScrollTop * giVT_CharHeight;
1400                 buf.DstY = (Term->ScrollTop+Count) * giVT_CharHeight;
1401                 buf.H = (Term->ScrollHeight+Count) * giVT_CharHeight;
1402         }
1403         VFS_WriteAt(giVT_OutputDevHandle, 0, sizeof(buf), &buf);
1404
1405         // Restore old mode (this function is only called during text mode)
1406         tmp = VIDEO_BUFFMT_TEXT;
1407         VFS_IOCtl(giVT_OutputDevHandle, VIDEO_IOCTL_SETBUFFORMAT, &tmp);
1408 }
1409
1410 /**
1411  * \fn void VT_int_UpdateScreen( tVTerm *Term, int UpdateAll )
1412  * \brief Updates the video framebuffer
1413  */
1414 void VT_int_UpdateScreen( tVTerm *Term, int UpdateAll )
1415 {
1416         tVT_Char        *buffer;
1417          int    view_pos, write_pos;
1418         // Only update if this is the current terminal
1419         if( Term != gpVT_CurTerm )      return;
1420
1421         switch( Term->Mode )
1422         {
1423         case TERM_MODE_TEXT:
1424                 view_pos = (Term->Flags & VT_FLAG_ALTBUF) ? 0 : Term->ViewPos;
1425                 write_pos = (Term->Flags & VT_FLAG_ALTBUF) ? Term->AltWritePos : Term->WritePos;
1426                 buffer = (Term->Flags & VT_FLAG_ALTBUF) ? Term->AltBuf : Term->Text;
1427                 // Re copy the entire screen?
1428                 if(UpdateAll) {
1429                         VFS_WriteAt(
1430                                 giVT_OutputDevHandle,
1431                                 0,
1432                                 Term->TextWidth*Term->TextHeight*sizeof(tVT_Char),
1433                                 &buffer[view_pos]
1434                                 );
1435                 }
1436                 // Only copy the current line
1437                 else {
1438                          int    ofs = write_pos - write_pos % Term->TextWidth;
1439                         VFS_WriteAt(
1440                                 giVT_OutputDevHandle,
1441                                 (ofs - view_pos)*sizeof(tVT_Char),
1442                                 Term->TextWidth*sizeof(tVT_Char),
1443                                 &buffer[ofs]
1444                                 );
1445                 }
1446                 break;
1447         case TERM_MODE_FB:
1448                 VFS_WriteAt(
1449                         giVT_OutputDevHandle,
1450                         0,
1451                         Term->Width*Term->Height*sizeof(Uint32),
1452                         Term->Buffer
1453                         );
1454                 break;
1455         }
1456 }
1457
1458 /**
1459  * \brief Update the screen mode
1460  * \param Term  Terminal to update
1461  * \param NewMode       New mode to set
1462  * \param NewWidth      New framebuffer width
1463  * \param NewHeight     New framebuffer height
1464  */
1465 void VT_int_ChangeMode(tVTerm *Term, int NewMode, int NewWidth, int NewHeight)
1466 {
1467
1468         // TODO: Increase RealWidth/RealHeight when this happens
1469         if(NewWidth > giVT_RealWidth)   NewWidth = giVT_RealWidth;
1470         if(NewHeight > giVT_RealHeight) NewHeight = giVT_RealHeight;
1471
1472         Term->Mode = NewMode;
1473
1474         if(NewWidth != Term->Width || NewHeight != Term->Height)
1475         {
1476                  int    oldW = Term->Width;
1477                  int    oldTW = Term->TextWidth;
1478                  int    oldH = Term->Height;
1479                  int    oldTH = Term->TextHeight;
1480                 tVT_Char        *oldTBuf = Term->Text;
1481                 Uint32  *oldFB = Term->Buffer;
1482                  int    w, h, i;
1483                 // Calculate new dimensions
1484                 Term->Width = NewWidth;
1485                 Term->Height = NewHeight;
1486                 Term->TextWidth = NewWidth / giVT_CharWidth;
1487                 Term->TextHeight = NewHeight / giVT_CharHeight;
1488                 Term->ScrollHeight = Term->TextHeight - (oldTH - Term->ScrollHeight) - Term->ScrollTop;
1489
1490                 // Allocate new buffers
1491                 // - Text
1492                 Term->Text = calloc(
1493                         Term->TextWidth * Term->TextHeight * (giVT_Scrollback+1),
1494                         sizeof(tVT_Char)
1495                         );
1496                 if(oldTBuf) {
1497                         // Copy old buffer
1498                         w = (oldTW > Term->TextWidth) ? Term->TextWidth : oldTW;
1499                         h = (oldTH > Term->TextHeight) ? Term->TextHeight : oldTH;
1500                         h *= giVT_Scrollback + 1;
1501                         for( i = 0; i < h; i ++ )
1502                         {
1503                                 memcpy(
1504                                         &Term->Text[i*Term->TextWidth],
1505                                         &oldTBuf[i*oldTW],
1506                                         w*sizeof(tVT_Char)
1507                                         );
1508                         }
1509                         free(oldTBuf);
1510                 }
1511
1512                 // - Alternate Text
1513                 Term->AltBuf = realloc(
1514                         Term->AltBuf,
1515                         Term->TextWidth * Term->TextHeight * sizeof(tVT_Char)
1516                         );
1517
1518                 // - Framebuffer
1519                 Term->Buffer = calloc( Term->Width * Term->Height, sizeof(Uint32) );
1520                 if(oldFB) {
1521                         // Copy old buffer
1522                         w = (oldW > Term->Width) ? Term->Width : oldW;
1523                         h = (oldH > Term->Height) ? Term->Height : oldH;
1524                         for( i = 0; i < h; i ++ )
1525                         {
1526                                 memcpy(
1527                                         &Term->Buffer[i*Term->Width],
1528                                         &oldFB[i*oldW],
1529                                         w*sizeof(Uint32)
1530                                         );
1531                         }
1532                         free(oldFB);
1533                 }
1534         }
1535
1536
1537         // Debug
1538         switch(NewMode)
1539         {
1540         case TERM_MODE_TEXT:
1541                 Log_Log("VTerm", "Set VT %p to text mode (%ix%i)",
1542                         Term, Term->TextWidth, Term->TextHeight);
1543                 break;
1544         case TERM_MODE_FB:
1545                 Log_Log("VTerm", "Set VT %p to framebuffer mode (%ix%i)",
1546                         Term, Term->Width, Term->Height);
1547                 break;
1548         //case TERM_MODE_2DACCEL:
1549         //case TERM_MODE_3DACCEL:
1550         //      return;
1551         }
1552 }
1553
1554
1555 void VT_int_ToggleAltBuffer(tVTerm *Term, int Enabled)
1556 {
1557         if(Enabled)
1558                 Term->Flags |= VT_FLAG_ALTBUF;
1559         else
1560                 Term->Flags &= ~VT_FLAG_ALTBUF;
1561 }
1562
1563 // ---
1564 // Font Render
1565 // ---
1566 #define MONOSPACE_FONT  10816
1567
1568 #if MONOSPACE_FONT == 10808     // 8x8
1569 # include "vterm_font_8x8.h"
1570 #elif MONOSPACE_FONT == 10816   // 8x16
1571 # include "vterm_font_8x16.h"
1572 #endif
1573
1574 // === PROTOTYPES ===
1575 Uint8   *VT_Font_GetChar(Uint32 Codepoint);
1576
1577 // === GLOBALS ===
1578 int     giVT_CharWidth = FONT_WIDTH;
1579 int     giVT_CharHeight = FONT_HEIGHT;
1580
1581 // === CODE ===
1582 /**
1583  * \brief Render a font character
1584  */
1585 void VT_Font_Render(Uint32 Codepoint, void *Buffer, int Depth, int Pitch, Uint32 BGC, Uint32 FGC)
1586 {
1587         Uint8   *font;
1588          int    x, y;
1589
1590         // 8-bpp and below
1591         if( Depth <= 8 )
1592         {
1593                 Uint8   *buf = Buffer;
1594
1595                 font = VT_Font_GetChar(Codepoint);
1596
1597                 for(y = 0; y < FONT_HEIGHT; y ++)
1598                 {
1599                         for(x = 0; x < FONT_WIDTH; x ++)
1600                         {
1601                                 if(*font & (1 << (FONT_WIDTH-x-1)))
1602                                         buf[x] = FGC;
1603                                 else
1604                                         buf[x] = BGC;
1605                         }
1606                         buf = (void*)( (tVAddr)buf + Pitch );
1607                         font ++;
1608                 }
1609         }
1610         // 16-bpp and below
1611         else if( Depth <= 16 )
1612         {
1613                 Uint16  *buf = Buffer;
1614
1615                 font = VT_Font_GetChar(Codepoint);
1616
1617                 for(y = 0; y < FONT_HEIGHT; y ++)
1618                 {
1619                         for(x = 0; x < FONT_WIDTH; x ++)
1620                         {
1621                                 if(*font & (1 << (FONT_WIDTH-x-1)))
1622                                         buf[x] = FGC;
1623                                 else
1624                                         buf[x] = BGC;
1625                         }
1626                         buf = (void*)( (tVAddr)buf + Pitch );
1627                         font ++;
1628                 }
1629         }
1630         // 24-bpp colour
1631         // - Special handling to not overwrite the next pixel
1632         //TODO: Endian issues here
1633         else if( Depth == 24 )
1634         {
1635                 Uint8   *buf = Buffer;
1636                 Uint8   bg_r = (BGC >> 16) & 0xFF;
1637                 Uint8   bg_g = (BGC >>  8) & 0xFF;
1638                 Uint8   bg_b = (BGC >>  0) & 0xFF;
1639                 Uint8   fg_r = (FGC >> 16) & 0xFF;
1640                 Uint8   fg_g = (FGC >>  8) & 0xFF;
1641                 Uint8   fg_b = (FGC >>  0) & 0xFF;
1642
1643                 font = VT_Font_GetChar(Codepoint);
1644
1645                 for(y = 0; y < FONT_HEIGHT; y ++)
1646                 {
1647                         for(x = 0; x < FONT_WIDTH; x ++)
1648                         {
1649                                 Uint8   r, g, b;
1650
1651                                 if(*font & (1 << (FONT_WIDTH-x-1))) {
1652                                         r = fg_r;       g = fg_g;       b = fg_b;
1653                                 }
1654                                 else {
1655                                         r = bg_r;       g = bg_g;       b = bg_b;
1656                                 }
1657                                 buf[x*3+0] = b;
1658                                 buf[x*3+1] = g;
1659                                 buf[x*3+2] = r;
1660                         }
1661                         buf = (void*)( (tVAddr)buf + Pitch );
1662                         font ++;
1663                 }
1664         }
1665         // 32-bpp colour (nice and easy)
1666         else if( Depth == 32 )
1667         {
1668                 Uint32  *buf = Buffer;
1669
1670                 font = VT_Font_GetChar(Codepoint);
1671
1672                 for(y = 0; y < FONT_HEIGHT; y ++)
1673                 {
1674                         for(x = 0; x < FONT_WIDTH; x ++)
1675                         {
1676                                 if(*font & (1 << (FONT_WIDTH-x-1)))
1677                                         buf[x] = FGC;
1678                                 else
1679                                         buf[x] = BGC;
1680                         }
1681                         buf = (Uint32*)( (tVAddr)buf + Pitch );
1682                         font ++;
1683                 }
1684         }
1685 }
1686
1687 /**
1688  * \fn Uint32 VT_Colour12to24(Uint16 Col12)
1689  * \brief Converts a 12-bit colour into 24 bits
1690  */
1691 Uint32 VT_Colour12to24(Uint16 Col12)
1692 {
1693         Uint32  ret;
1694          int    tmp;
1695         tmp = Col12 & 0xF;
1696         ret  = (tmp << 0) | (tmp << 4);
1697         tmp = (Col12 & 0xF0) >> 4;
1698         ret |= (tmp << 8) | (tmp << 12);
1699         tmp = (Col12 & 0xF00) >> 8;
1700         ret |= (tmp << 16) | (tmp << 20);
1701         return ret;
1702 }
1703 /**
1704  * \brief Converts a 12-bit colour into 15 bits
1705  */
1706 Uint16 VT_Colour12to15(Uint16 Col12)
1707 {
1708         Uint32  ret;
1709          int    tmp;
1710         tmp = Col12 & 0xF;
1711         ret  = (tmp << 1) | (tmp & 1);
1712         tmp = (Col12 & 0xF0) >> 4;
1713         ret |= ( (tmp << 1) | (tmp & 1) ) << 5;
1714         tmp = (Col12 & 0xF00) >> 8;
1715         ret |= ( (tmp << 1) | (tmp & 1) ) << 10;
1716         return ret;
1717 }
1718
1719 /**
1720  * \brief Converts a 12-bit colour into any other depth
1721  * \param Col12 12-bit source colour
1722  * \param Depth Desired bit deptj
1723  * \note Green then blue get the extra avaliable bits (16:5-6-5, 14:4-5-5)
1724  */
1725 Uint32 VT_Colour12toN(Uint16 Col12, int Depth)
1726 {
1727         Uint32  ret;
1728         Uint32  r, g, b;
1729          int    rSize, gSize, bSize;
1730
1731         // Fast returns
1732         if( Depth == 24 )       return VT_Colour12to24(Col12);
1733         if( Depth == 15 )       return VT_Colour12to15(Col12);
1734         // - 32 is a special case, it's usually 24-bit colour with an unused byte
1735         if( Depth == 32 )       return VT_Colour12to24(Col12);
1736
1737         // Bounds checks
1738         if( Depth < 8 ) return 0;
1739         if( Depth > 32 )        return 0;
1740
1741         r = Col12 & 0xF;
1742         g = (Col12 & 0xF0) >> 4;
1743         b = (Col12 & 0xF00) >> 8;
1744
1745         rSize = gSize = bSize = Depth / 3;
1746         if( rSize + gSize + bSize < Depth )     // Depth % 3 == 1
1747                 gSize ++;
1748         if( rSize + gSize + bSize < Depth )     // Depth % 3 == 2
1749                 bSize ++;
1750
1751         // Expand
1752         r <<= rSize - 4;        g <<= gSize - 4;        b <<= bSize - 4;
1753         // Fill with the lowest bit
1754         if( Col12 & 0x001 )     r |= (1 << (rSize - 4)) - 1;
1755         if( Col12 & 0x010 )     r |= (1 << (gSize - 4)) - 1;
1756         if( Col12 & 0x100 )     r |= (1 << (bSize - 4)) - 1;
1757
1758         // Create output
1759         ret  = r;
1760         ret |= g << rSize;
1761         ret |= b << (rSize + gSize);
1762
1763         return ret;
1764 }
1765
1766 /**
1767  * \fn Uint8 *VT_Font_GetChar(Uint32 Codepoint)
1768  * \brief Gets an index into the font array given a Unicode Codepoint
1769  * \note See http://en.wikipedia.org/wiki/CP437
1770  */
1771 Uint8 *VT_Font_GetChar(Uint32 Codepoint)
1772 {
1773          int    index = 0;
1774         if(Codepoint < 128)
1775                 return &VTermFont[Codepoint*FONT_HEIGHT];
1776         switch(Codepoint)
1777         {
1778         case 0xC7:      index = 128;    break;  // Ç
1779         case 0xFC:      index = 129;    break;  // ü
1780         case 0xE9:      index = 130;    break;  // é
1781         case 0xE2:      index = 131;    break;  // â
1782         case 0xE4:      index = 132;    break;  // ä
1783         case 0xE0:      index = 133;    break;  // à
1784         case 0xE5:      index = 134;    break;  // å
1785         case 0xE7:      index = 135;    break;  // ç
1786         case 0xEA:      index = 136;    break;  // ê
1787         case 0xEB:      index = 137;    break;  // ë
1788         case 0xE8:      index = 138;    break;  // è
1789         case 0xEF:      index = 139;    break;  // ï
1790         case 0xEE:      index = 140;    break;  // î
1791         case 0xEC:      index = 141;    break;  // ì
1792         case 0xC4:      index = 142;    break;  // Ä
1793         case 0xC5:      index = 143;    break;  // Å
1794         }
1795
1796         return &VTermFont[index*FONT_HEIGHT];
1797 }
1798
1799 EXPORTAS(&giVT_CharWidth, giVT_CharWidth);
1800 EXPORTAS(&giVT_CharHeight, giVT_CharHeight);
1801 EXPORT(VT_Font_Render);
1802 EXPORT(VT_Colour12to24);