dlls/opengl32/wgl.c

   1 /* Window-specific OpenGL functions implementation.
   2  *
   3  * Copyright (c) 1999 Lionel Ulmer
   4  * Copyright (c) 2005 Raphael Junqueira
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <stdarg.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27
  28 #include "windef.h"
  29 #include "winbase.h"
  30 #include "winuser.h"
  31 #include "winreg.h"
  32 #include "wingdi.h"
  33 #include "winternl.h"
  34 #include "winnt.h"
  35
  36 #include "opengl_ext.h"
  37 #include "wine/gdi_driver.h"
  38 #include "wine/glu.h"
  39 #include "wine/debug.h"
  40
  41 WINE_DEFAULT_DEBUG_CHANNEL(wgl);
  42 WINE_DECLARE_DEBUG_CHANNEL(fps);
  43
  44 /* handle management */
  45
  46 #define MAX_WGL_HANDLES 1024
  47
  48 enum wgl_handle_type
  49 {
  50     HANDLE_PBUFFER = 0 << 12,
  51     HANDLE_CONTEXT = 1 << 12,
  52     HANDLE_CONTEXT_V3 = 3 << 12,
  53     HANDLE_TYPE_MASK = 15 << 12
  54 };
  55
  56 struct opengl_context
  57 {
  58     DWORD               tid;           /* thread that the context is current in */
  59     HDC                 draw_dc;       /* current drawing DC */
  60     HDC                 read_dc;       /* current reading DC */
  61     void     (CALLBACK *debug_callback)(GLenum, GLenum, GLuint, GLenum,
  62                                         GLsizei, const GLchar *, const void *); /* debug callback */
  63     const void         *debug_user;    /* debug user parameter */
  64     GLubyte            *extensions;    /* extension string */
  65     GLuint             *disabled_exts; /* indices of disabled extensions */
  66     struct wgl_context *drv_ctx;       /* driver context */
  67 };
  68
  69 struct wgl_handle
  70 {
  71     UINT                 handle;
  72     struct opengl_funcs *funcs;
  73     union
  74     {
  75         struct opengl_context *context;  /* for HANDLE_CONTEXT */
  76         struct wgl_pbuffer    *pbuffer;  /* for HANDLE_PBUFFER */
  77         struct wgl_handle     *next;     /* for free handles */
  78     } u;
  79 };
  80
  81 static struct wgl_handle wgl_handles[MAX_WGL_HANDLES];
  82 static struct wgl_handle *next_free;
  83 static unsigned int handle_count;
  84
  85 static CRITICAL_SECTION wgl_section;
  86 static CRITICAL_SECTION_DEBUG critsect_debug =
  87 {
  88     0, 0, &wgl_section,
  89     { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
  90       0, 0, { (DWORD_PTR)(__FILE__ ": wgl_section") }
  91 };
  92 static CRITICAL_SECTION wgl_section = { &critsect_debug, -1, 0, 0, 0, 0 };
  93
  94 static const MAT2 identity = { {0,1},{0,0},{0,0},{0,1} };
  95
  96 static inline HANDLE next_handle( struct wgl_handle *ptr, enum wgl_handle_type type )
  97 {
  98     WORD generation = HIWORD( ptr->handle ) + 1;
  99     if (!generation) generation++;
 100     ptr->handle = MAKELONG( ptr - wgl_handles, generation ) | type;
 101     return ULongToHandle( ptr->handle );
 102 }
 103
 104 /* the current context is assumed valid and doesn't need locking */
 105 static inline struct wgl_handle *get_current_context_ptr(void)
 106 {
 107     if (!NtCurrentTeb()->glCurrentRC) return NULL;
 108     return &wgl_handles[LOWORD(NtCurrentTeb()->glCurrentRC) & ~HANDLE_TYPE_MASK];
 109 }
 110
 111 static struct wgl_handle *get_handle_ptr( HANDLE handle, enum wgl_handle_type type )
 112 {
 113     unsigned int index = LOWORD( handle ) & ~HANDLE_TYPE_MASK;
 114
 115     EnterCriticalSection( &wgl_section );
 116     if (index < handle_count && ULongToHandle(wgl_handles[index].handle) == handle)
 117         return &wgl_handles[index];
 118
 119     LeaveCriticalSection( &wgl_section );
 120     SetLastError( ERROR_INVALID_HANDLE );
 121     return NULL;
 122 }
 123
 124 static void release_handle_ptr( struct wgl_handle *ptr )
 125 {
 126     if (ptr) LeaveCriticalSection( &wgl_section );
 127 }
 128
 129 static HANDLE alloc_handle( enum wgl_handle_type type, struct opengl_funcs *funcs, void *user_ptr )
 130 {
 131     HANDLE handle = 0;
 132     struct wgl_handle *ptr = NULL;
 133
 134     EnterCriticalSection( &wgl_section );
 135     if ((ptr = next_free))
 136         next_free = next_free->u.next;
 137     else if (handle_count < MAX_WGL_HANDLES)
 138         ptr = &wgl_handles[handle_count++];
 139
 140     if (ptr)
 141     {
 142         ptr->funcs = funcs;
 143         ptr->u.context = user_ptr;
 144         handle = next_handle( ptr, type );
 145     }
 146     else SetLastError( ERROR_NOT_ENOUGH_MEMORY );
 147     LeaveCriticalSection( &wgl_section );
 148     return handle;
 149 }
 150
 151 static void free_handle_ptr( struct wgl_handle *ptr )
 152 {
 153     ptr->handle |= 0xffff;
 154     ptr->u.next = next_free;
 155     ptr->funcs = NULL;
 156     next_free = ptr;
 157     LeaveCriticalSection( &wgl_section );
 158 }
 159
 160 static inline enum wgl_handle_type get_current_context_type(void)
 161 {
 162     if (!NtCurrentTeb()->glCurrentRC) return HANDLE_CONTEXT;
 163     return LOWORD(NtCurrentTeb()->glCurrentRC) & HANDLE_TYPE_MASK;
 164 }
 165
 166 /***********************************************************************
 167  *              wglCopyContext (OPENGL32.@)
 168  */
 169 BOOL WINAPI wglCopyContext(HGLRC hglrcSrc, HGLRC hglrcDst, UINT mask)
 170 {
 171     struct wgl_handle *src, *dst;
 172     BOOL ret = FALSE;
 173
 174     if (!(src = get_handle_ptr( hglrcSrc, HANDLE_CONTEXT ))) return FALSE;
 175     if ((dst = get_handle_ptr( hglrcDst, HANDLE_CONTEXT )))
 176     {
 177         if (src->funcs != dst->funcs) SetLastError( ERROR_INVALID_HANDLE );
 178         else ret = src->funcs->wgl.p_wglCopyContext( src->u.context->drv_ctx,
 179                                                      dst->u.context->drv_ctx, mask );
 180     }
 181     release_handle_ptr( dst );
 182     release_handle_ptr( src );
 183     return ret;
 184 }
 185
 186 /***********************************************************************
 187  *              wglDeleteContext (OPENGL32.@)
 188  */
 189 BOOL WINAPI wglDeleteContext(HGLRC hglrc)
 190 {
 191     struct wgl_handle *ptr = get_handle_ptr( hglrc, HANDLE_CONTEXT );
 192
 193     if (!ptr) return FALSE;
 194
 195     if (ptr->u.context->tid && ptr->u.context->tid != GetCurrentThreadId())
 196     {
 197         SetLastError( ERROR_BUSY );
 198         release_handle_ptr( ptr );
 199         return FALSE;
 200     }
 201     if (hglrc == NtCurrentTeb()->glCurrentRC) wglMakeCurrent( 0, 0 );
 202     ptr->funcs->wgl.p_wglDeleteContext( ptr->u.context->drv_ctx );
 203     HeapFree( GetProcessHeap(), 0, ptr->u.context->disabled_exts );
 204     HeapFree( GetProcessHeap(), 0, ptr->u.context->extensions );
 205     HeapFree( GetProcessHeap(), 0, ptr->u.context );
 206     free_handle_ptr( ptr );
 207     return TRUE;
 208 }
 209
 210 /***********************************************************************
 211  *              wglMakeCurrent (OPENGL32.@)
 212  */
 213 BOOL WINAPI wglMakeCurrent(HDC hdc, HGLRC hglrc)
 214 {
 215     BOOL ret = TRUE;
 216     struct wgl_handle *ptr, *prev = get_current_context_ptr();
 217
 218     if (hglrc)
 219     {
 220         if (!(ptr = get_handle_ptr( hglrc, HANDLE_CONTEXT ))) return FALSE;
 221         if (!ptr->u.context->tid || ptr->u.context->tid == GetCurrentThreadId())
 222         {
 223             ret = ptr->funcs->wgl.p_wglMakeCurrent( hdc, ptr->u.context->drv_ctx );
 224             if (ret)
 225             {
 226                 if (prev) prev->u.context->tid = 0;
 227                 ptr->u.context->tid = GetCurrentThreadId();
 228                 ptr->u.context->draw_dc = hdc;
 229                 ptr->u.context->read_dc = hdc;
 230                 NtCurrentTeb()->glCurrentRC = hglrc;
 231                 NtCurrentTeb()->glTable = ptr->funcs;
 232             }
 233         }
 234         else
 235         {
 236             SetLastError( ERROR_BUSY );
 237             ret = FALSE;
 238         }
 239         release_handle_ptr( ptr );
 240     }
 241     else if (prev)
 242     {
 243         if (!prev->funcs->wgl.p_wglMakeCurrent( 0, NULL )) return FALSE;
 244         prev->u.context->tid = 0;
 245         NtCurrentTeb()->glCurrentRC = 0;
 246         NtCurrentTeb()->glTable = &null_opengl_funcs;
 247     }
 248     else if (!hdc)
 249     {
 250         SetLastError( ERROR_INVALID_HANDLE );
 251         ret = FALSE;
 252     }
 253     return ret;
 254 }
 255
 256 /***********************************************************************
 257  *              wglCreateContextAttribsARB
 258  *
 259  * Provided by the WGL_ARB_create_context extension.
 260  */
 261 HGLRC WINAPI wglCreateContextAttribsARB( HDC hdc, HGLRC share, const int *attribs )
 262 {
 263     HGLRC ret = 0;
 264     struct wgl_context *drv_ctx;
 265     struct wgl_handle *share_ptr = NULL;
 266     struct opengl_context *context;
 267     struct opengl_funcs *funcs = get_dc_funcs( hdc );
 268
 269     if (!funcs)
 270     {
 271         SetLastError( ERROR_DC_NOT_FOUND );
 272         return 0;
 273     }
 274     if (!funcs->ext.p_wglCreateContextAttribsARB) return 0;
 275     if (share && !(share_ptr = get_handle_ptr( share, HANDLE_CONTEXT )))
 276     {
 277         SetLastError( ERROR_INVALID_OPERATION );
 278         return 0;
 279     }
 280     if ((drv_ctx = funcs->ext.p_wglCreateContextAttribsARB( hdc,
 281                                               share_ptr ? share_ptr->u.context->drv_ctx : NULL, attribs )))
 282     {
 283         if ((context = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(*context) )))
 284         {
 285             enum wgl_handle_type type = HANDLE_CONTEXT;
 286
 287             if (attribs)
 288             {
 289                 while (*attribs)
 290                 {
 291                     if (attribs[0] == WGL_CONTEXT_MAJOR_VERSION_ARB)
 292                     {
 293                         if (attribs[1] >= 3)
 294                             type = HANDLE_CONTEXT_V3;
 295                         break;
 296                     }
 297                     attribs += 2;
 298                 }
 299             }
 300
 301             context->drv_ctx = drv_ctx;
 302             if (!(ret = alloc_handle( type, funcs, context )))
 303                 HeapFree( GetProcessHeap(), 0, context );
 304         }
 305         if (!ret) funcs->wgl.p_wglDeleteContext( drv_ctx );
 306     }
 307     release_handle_ptr( share_ptr );
 308     return ret;
 309
 310 }
 311
 312 /***********************************************************************
 313  *              wglMakeContextCurrentARB
 314  *
 315  * Provided by the WGL_ARB_make_current_read extension.
 316  */
 317 BOOL WINAPI wglMakeContextCurrentARB( HDC draw_hdc, HDC read_hdc, HGLRC hglrc )
 318 {
 319     BOOL ret = TRUE;
 320     struct wgl_handle *ptr, *prev = get_current_context_ptr();
 321
 322     if (hglrc)
 323     {
 324         if (!(ptr = get_handle_ptr( hglrc, HANDLE_CONTEXT ))) return FALSE;
 325         if (!ptr->u.context->tid || ptr->u.context->tid == GetCurrentThreadId())
 326         {
 327             ret = (ptr->funcs->ext.p_wglMakeContextCurrentARB &&
 328                    ptr->funcs->ext.p_wglMakeContextCurrentARB( draw_hdc, read_hdc,
 329                                                                ptr->u.context->drv_ctx ));
 330             if (ret)
 331             {
 332                 if (prev) prev->u.context->tid = 0;
 333                 ptr->u.context->tid = GetCurrentThreadId();
 334                 ptr->u.context->draw_dc = draw_hdc;
 335                 ptr->u.context->read_dc = read_hdc;
 336                 NtCurrentTeb()->glCurrentRC = hglrc;
 337                 NtCurrentTeb()->glTable = ptr->funcs;
 338             }
 339         }
 340         else
 341         {
 342             SetLastError( ERROR_BUSY );
 343             ret = FALSE;
 344         }
 345         release_handle_ptr( ptr );
 346     }
 347     else if (prev)
 348     {
 349         if (!prev->funcs->wgl.p_wglMakeCurrent( 0, NULL )) return FALSE;
 350         prev->u.context->tid = 0;
 351         NtCurrentTeb()->glCurrentRC = 0;
 352         NtCurrentTeb()->glTable = &null_opengl_funcs;
 353     }
 354     return ret;
 355 }
 356
 357 /***********************************************************************
 358  *              wglGetCurrentReadDCARB
 359  *
 360  * Provided by the WGL_ARB_make_current_read extension.
 361  */
 362 HDC WINAPI wglGetCurrentReadDCARB(void)
 363 {
 364     struct wgl_handle *ptr = get_current_context_ptr();
 365
 366     if (!ptr) return 0;
 367     return ptr->u.context->read_dc;
 368 }
 369
 370 /***********************************************************************
 371  *              wglShareLists (OPENGL32.@)
 372  */
 373 BOOL WINAPI wglShareLists(HGLRC hglrcSrc, HGLRC hglrcDst)
 374 {
 375     BOOL ret = FALSE;
 376     struct wgl_handle *src, *dst;
 377
 378     if (!(src = get_handle_ptr( hglrcSrc, HANDLE_CONTEXT ))) return FALSE;
 379     if ((dst = get_handle_ptr( hglrcDst, HANDLE_CONTEXT )))
 380     {
 381         if (src->funcs != dst->funcs) SetLastError( ERROR_INVALID_HANDLE );
 382         else ret = src->funcs->wgl.p_wglShareLists( src->u.context->drv_ctx, dst->u.context->drv_ctx );
 383     }
 384     release_handle_ptr( dst );
 385     release_handle_ptr( src );
 386     return ret;
 387 }
 388
 389 /***********************************************************************
 390  *              wglGetCurrentDC (OPENGL32.@)
 391  */
 392 HDC WINAPI wglGetCurrentDC(void)
 393 {
 394     struct wgl_handle *ptr = get_current_context_ptr();
 395
 396     if (!ptr) return 0;
 397     return ptr->u.context->draw_dc;
 398 }
 399
 400 /***********************************************************************
 401  *              wgl_create_context wrapper for hooking
 402  */
 403 static HGLRC wgl_create_context(HDC hdc)
 404 {
 405     HGLRC ret = 0;
 406     struct wgl_context *drv_ctx;
 407     struct opengl_context *context;
 408     struct opengl_funcs *funcs = get_dc_funcs( hdc );
 409
 410     if (!funcs) return 0;
 411     if (!(drv_ctx = funcs->wgl.p_wglCreateContext( hdc ))) return 0;
 412     if ((context = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(*context) )))
 413     {
 414         context->drv_ctx = drv_ctx;
 415         if (!(ret = alloc_handle( HANDLE_CONTEXT, funcs, context )))
 416             HeapFree( GetProcessHeap(), 0, context );
 417     }
 418     if (!ret) funcs->wgl.p_wglDeleteContext( drv_ctx );
 419     return ret;
 420 }
 421
 422 /***********************************************************************
 423  *              wglCreateContext (OPENGL32.@)
 424  */
 425 HGLRC WINAPI wglCreateContext(HDC hdc)
 426 {
 427     return wgl_create_context(hdc);
 428 }
 429
 430 /***********************************************************************
 431  *              wglGetCurrentContext (OPENGL32.@)
 432  */
 433 HGLRC WINAPI wglGetCurrentContext(void)
 434 {
 435     return NtCurrentTeb()->glCurrentRC;
 436 }
 437
 438 /***********************************************************************
 439  *              wglDescribePixelFormat (OPENGL32.@)
 440  */
 441 INT WINAPI wglDescribePixelFormat(HDC hdc, INT format, UINT size, PIXELFORMATDESCRIPTOR *descr )
 442 {
 443     struct opengl_funcs *funcs = get_dc_funcs( hdc );
 444     if (!funcs) return 0;
 445     return funcs->wgl.p_wglDescribePixelFormat( hdc, format, size, descr );
 446 }
 447
 448 /***********************************************************************
 449  *              wglChoosePixelFormat (OPENGL32.@)
 450  */
 451 INT WINAPI wglChoosePixelFormat(HDC hdc, const PIXELFORMATDESCRIPTOR* ppfd)
 452 {
 453     PIXELFORMATDESCRIPTOR format, best;
 454     int i, count, best_format;
 455     int bestDBuffer = -1, bestStereo = -1;
 456
 457     TRACE_(wgl)( "%p %p: size %u version %u flags %u type %u color %u %u,%u,%u,%u "
 458                  "accum %u depth %u stencil %u aux %u\n",
 459                  hdc, ppfd, ppfd->nSize, ppfd->nVersion, ppfd->dwFlags, ppfd->iPixelType,
 460                  ppfd->cColorBits, ppfd->cRedBits, ppfd->cGreenBits, ppfd->cBlueBits, ppfd->cAlphaBits,
 461                  ppfd->cAccumBits, ppfd->cDepthBits, ppfd->cStencilBits, ppfd->cAuxBuffers );
 462
 463     count = wglDescribePixelFormat( hdc, 0, 0, NULL );
 464     if (!count) return 0;
 465
 466     best_format = 0;
 467     best.dwFlags = 0;
 468     best.cAlphaBits = -1;
 469     best.cColorBits = -1;
 470     best.cDepthBits = -1;
 471     best.cStencilBits = -1;
 472     best.cAuxBuffers = -1;
 473
 474     for (i = 1; i <= count; i++)
 475     {
 476         if (!wglDescribePixelFormat( hdc, i, sizeof(format), &format )) continue;
 477
 478         if ((ppfd->iPixelType == PFD_TYPE_COLORINDEX) != (format.iPixelType == PFD_TYPE_COLORINDEX))
 479         {
 480             TRACE( "pixel type mismatch for iPixelFormat=%d\n", i );
 481             continue;
 482         }
 483
 484         /* only use bitmap capable for formats for bitmap rendering */
 485         if( (ppfd->dwFlags & PFD_DRAW_TO_BITMAP) != (format.dwFlags & PFD_DRAW_TO_BITMAP))
 486         {
 487             TRACE( "PFD_DRAW_TO_BITMAP mismatch for iPixelFormat=%d\n", i );
 488             continue;
 489         }
 490
 491         /* The behavior of PDF_STEREO/PFD_STEREO_DONTCARE and PFD_DOUBLEBUFFER / PFD_DOUBLEBUFFER_DONTCARE
 492          * is not very clear on MSDN. They specify that ChoosePixelFormat tries to match pixel formats
 493          * with the flag (PFD_STEREO / PFD_DOUBLEBUFFERING) set. Otherwise it says that it tries to match
 494          * formats without the given flag set.
 495          * A test on Windows using a Radeon 9500pro on WinXP (the driver doesn't support Stereo)
 496          * has indicated that a format without stereo is returned when stereo is unavailable.
 497          * So in case PFD_STEREO is set, formats that support it should have priority above formats
 498          * without. In case PFD_STEREO_DONTCARE is set, stereo is ignored.
 499          *
 500          * To summarize the following is most likely the correct behavior:
 501          * stereo not set -> prefer non-stereo formats, but also accept stereo formats
 502          * stereo set -> prefer stereo formats, but also accept non-stereo formats
 503          * stereo don't care -> it doesn't matter whether we get stereo or not
 504          *
 505          * In Wine we will treat non-stereo the same way as don't care because it makes
 506          * format selection even more complicated and second drivers with Stereo advertise
 507          * each format twice anyway.
 508          */
 509
 510         /* Doublebuffer, see the comments above */
 511         if (!(ppfd->dwFlags & PFD_DOUBLEBUFFER_DONTCARE))
 512         {
 513             if (((ppfd->dwFlags & PFD_DOUBLEBUFFER) != bestDBuffer) &&
 514                 ((format.dwFlags & PFD_DOUBLEBUFFER) == (ppfd->dwFlags & PFD_DOUBLEBUFFER)))
 515                 goto found;
 516
 517             if (bestDBuffer != -1 && (format.dwFlags & PFD_DOUBLEBUFFER) != bestDBuffer) continue;
 518         }
 519         else if (!best_format)
 520             goto found;
 521
 522         /* Stereo, see the comments above. */
 523         if (!(ppfd->dwFlags & PFD_STEREO_DONTCARE))
 524         {
 525             if (((ppfd->dwFlags & PFD_STEREO) != bestStereo) &&
 526                 ((format.dwFlags & PFD_STEREO) == (ppfd->dwFlags & PFD_STEREO)))
 527                 goto found;
 528
 529             if (bestStereo != -1 && (format.dwFlags & PFD_STEREO) != bestStereo) continue;
 530         }
 531         else if (!best_format)
 532             goto found;
 533
 534         /* Below we will do a number of checks to select the 'best' pixelformat.
 535          * We assume the precedence cColorBits > cAlphaBits > cDepthBits > cStencilBits -> cAuxBuffers.
 536          * The code works by trying to match the most important options as close as possible.
 537          * When a reasonable format is found, we will try to match more options.
 538          * It appears (see the opengl32 test) that Windows opengl drivers ignore options
 539          * like cColorBits, cAlphaBits and friends if they are set to 0, so they are considered
 540          * as DONTCARE. At least Serious Sam TSE relies on this behavior. */
 541
 542         if (ppfd->cColorBits)
 543         {
 544             if (((ppfd->cColorBits > best.cColorBits) && (format.cColorBits > best.cColorBits)) ||
 545                 ((format.cColorBits >= ppfd->cColorBits) && (format.cColorBits < best.cColorBits)))
 546                 goto found;
 547
 548             if (best.cColorBits != format.cColorBits)  /* Do further checks if the format is compatible */
 549             {
 550                 TRACE( "color mismatch for iPixelFormat=%d\n", i );
 551                 continue;
 552             }
 553         }
 554         if (ppfd->cAlphaBits)
 555         {
 556             if (((ppfd->cAlphaBits > best.cAlphaBits) && (format.cAlphaBits > best.cAlphaBits)) ||
 557                 ((format.cAlphaBits >= ppfd->cAlphaBits) && (format.cAlphaBits < best.cAlphaBits)))
 558                 goto found;
 559
 560             if (best.cAlphaBits != format.cAlphaBits)
 561             {
 562                 TRACE( "alpha mismatch for iPixelFormat=%d\n", i );
 563                 continue;
 564             }
 565         }
 566         if (ppfd->cDepthBits)
 567         {
 568             if (((ppfd->cDepthBits > best.cDepthBits) && (format.cDepthBits > best.cDepthBits)) ||
 569                 ((format.cDepthBits >= ppfd->cDepthBits) && (format.cDepthBits < best.cDepthBits)))
 570                 goto found;
 571
 572             if (best.cDepthBits != format.cDepthBits)
 573             {
 574                 TRACE( "depth mismatch for iPixelFormat=%d\n", i );
 575                 continue;
 576             }
 577         }
 578         if (ppfd->cStencilBits)
 579         {
 580             if (((ppfd->cStencilBits > best.cStencilBits) && (format.cStencilBits > best.cStencilBits)) ||
 581                 ((format.cStencilBits >= ppfd->cStencilBits) && (format.cStencilBits < best.cStencilBits)))
 582                 goto found;
 583
 584             if (best.cStencilBits != format.cStencilBits)
 585             {
 586                 TRACE( "stencil mismatch for iPixelFormat=%d\n", i );
 587                 continue;
 588             }
 589         }
 590         if (ppfd->cAuxBuffers)
 591         {
 592             if (((ppfd->cAuxBuffers > best.cAuxBuffers) && (format.cAuxBuffers > best.cAuxBuffers)) ||
 593                 ((format.cAuxBuffers >= ppfd->cAuxBuffers) && (format.cAuxBuffers < best.cAuxBuffers)))
 594                 goto found;
 595
 596             if (best.cAuxBuffers != format.cAuxBuffers)
 597             {
 598                 TRACE( "aux mismatch for iPixelFormat=%d\n", i );
 599                 continue;
 600             }
 601         }
 602         continue;
 603
 604     found:
 605         best_format = i;
 606         best = format;
 607         bestDBuffer = format.dwFlags & PFD_DOUBLEBUFFER;
 608         bestStereo = format.dwFlags & PFD_STEREO;
 609     }
 610
 611     TRACE( "returning %u\n", best_format );
 612     return best_format;
 613 }
 614
 615 /***********************************************************************
 616  *              wglGetPixelFormat (OPENGL32.@)
 617  */
 618 INT WINAPI wglGetPixelFormat(HDC hdc)
 619 {
 620     struct opengl_funcs *funcs = get_dc_funcs( hdc );
 621     if (!funcs)
 622     {
 623         SetLastError( ERROR_INVALID_PIXEL_FORMAT );
 624         return 0;
 625     }
 626     return funcs->wgl.p_wglGetPixelFormat( hdc );
 627 }
 628
 629 /***********************************************************************
 630  *               wglSetPixelFormat(OPENGL32.@)
 631  */
 632 BOOL WINAPI wglSetPixelFormat( HDC hdc, INT format, const PIXELFORMATDESCRIPTOR *descr )
 633 {
 634     struct opengl_funcs *funcs = get_dc_funcs( hdc );
 635     if (!funcs) return FALSE;
 636     return funcs->wgl.p_wglSetPixelFormat( hdc, format, descr );
 637 }
 638
 639 /***********************************************************************
 640  *              wglSwapBuffers (OPENGL32.@)
 641  */
 642 BOOL WINAPI DECLSPEC_HOTPATCH wglSwapBuffers( HDC hdc )
 643 {
 644     const struct opengl_funcs *funcs = get_dc_funcs( hdc );
 645
 646     if (!funcs || !funcs->wgl.p_wglSwapBuffers) return FALSE;
 647     if (!funcs->wgl.p_wglSwapBuffers( hdc )) return FALSE;
 648
 649     if (TRACE_ON(fps))
 650     {
 651         static long prev_time, start_time;
 652         static unsigned long frames, frames_total;
 653
 654         DWORD time = GetTickCount();
 655         frames++;
 656         frames_total++;
 657         /* every 1.5 seconds */
 658         if (time - prev_time > 1500)
 659         {
 660             TRACE_(fps)("@ approx %.2ffps, total %.2ffps\n",
 661                         1000.0*frames/(time - prev_time), 1000.0*frames_total/(time - start_time));
 662             prev_time = time;
 663             frames = 0;
 664             if (start_time == 0) start_time = time;
 665         }
 666     }
 667     return TRUE;
 668 }
 669
 670 /***********************************************************************
 671  *              wglCreateLayerContext (OPENGL32.@)
 672  */
 673 HGLRC WINAPI wglCreateLayerContext(HDC hdc,
 674                                    int iLayerPlane) {
 675   TRACE("(%p,%d)\n", hdc, iLayerPlane);
 676
 677   if (iLayerPlane == 0) {
 678       return wgl_create_context(hdc);
 679   }
 680   FIXME("no handler for layer %d\n", iLayerPlane);
 681
 682   return NULL;
 683 }
 684
 685 /***********************************************************************
 686  *              wglDescribeLayerPlane (OPENGL32.@)
 687  */
 688 BOOL WINAPI wglDescribeLayerPlane(HDC hdc,
 689                                   int iPixelFormat,
 690                                   int iLayerPlane,
 691                                   UINT nBytes,
 692                                   LPLAYERPLANEDESCRIPTOR plpd) {
 693   FIXME("(%p,%d,%d,%d,%p)\n", hdc, iPixelFormat, iLayerPlane, nBytes, plpd);
 694
 695   return FALSE;
 696 }
 697
 698 /***********************************************************************
 699  *              wglGetLayerPaletteEntries (OPENGL32.@)
 700  */
 701 int WINAPI wglGetLayerPaletteEntries(HDC hdc,
 702                                      int iLayerPlane,
 703                                      int iStart,
 704                                      int cEntries,
 705                                      const COLORREF *pcr) {
 706   FIXME("(): stub!\n");
 707
 708   return 0;
 709 }
 710
 711 static BOOL filter_extensions(const char *extensions, GLubyte **exts_list, GLuint **disabled_exts);
 712
 713 void WINAPI glGetIntegerv(GLenum pname, GLint *data)
 714 {
 715     const struct opengl_funcs *funcs = NtCurrentTeb()->glTable;
 716
 717     TRACE("(%d, %p)\n", pname, data);
 718     if (pname == GL_NUM_EXTENSIONS)
 719     {
 720         struct wgl_handle *ptr = get_current_context_ptr();
 721
 722         if (ptr->u.context->disabled_exts ||
 723             filter_extensions(NULL, NULL, &ptr->u.context->disabled_exts))
 724         {
 725             const GLuint *disabled_exts = ptr->u.context->disabled_exts;
 726             GLint count, disabled_count = 0;
 727
 728             funcs->gl.p_glGetIntegerv(pname, &count);
 729             while (*disabled_exts++ != ~0u)
 730                 disabled_count++;
 731             *data = count - disabled_count;
 732             return;
 733         }
 734     }
 735     funcs->gl.p_glGetIntegerv(pname, data);
 736 }
 737
 738 const GLubyte * WINAPI glGetStringi(GLenum name, GLuint index)
 739 {
 740     const struct opengl_funcs *funcs = NtCurrentTeb()->glTable;
 741
 742     TRACE("(%d, %d)\n", name, index);
 743     if (!funcs->ext.p_glGetStringi)
 744     {
 745         void **func_ptr = (void **)&funcs->ext.p_glGetStringi;
 746
 747         *func_ptr = funcs->wgl.p_wglGetProcAddress("glGetStringi");
 748     }
 749
 750     if (name == GL_EXTENSIONS)
 751     {
 752         struct wgl_handle *ptr = get_current_context_ptr();
 753
 754         if (ptr->u.context->disabled_exts ||
 755             filter_extensions(NULL, NULL, &ptr->u.context->disabled_exts))
 756         {
 757             const GLuint *disabled_exts = ptr->u.context->disabled_exts;
 758             unsigned int disabled_count = 0;
 759
 760             while (index + disabled_count >= *disabled_exts++)
 761                 disabled_count++;
 762             return funcs->ext.p_glGetStringi(name, index + disabled_count);
 763         }
 764     }
 765     return funcs->ext.p_glGetStringi(name, index);
 766 }
 767
 768 /* check if the extension is present in the list */
 769 static BOOL has_extension( const char *list, const char *ext, size_t len )
 770 {
 771     if (!list)
 772     {
 773         const char *gl_ext;
 774         unsigned int i;
 775         GLint extensions_count;
 776
 777         glGetIntegerv(GL_NUM_EXTENSIONS, &extensions_count);
 778         for (i = 0; i < extensions_count; ++i)
 779         {
 780             gl_ext = (const char *)glGetStringi(GL_EXTENSIONS, i);
 781             if (!strncmp(gl_ext, ext, len) && !gl_ext[len])
 782                 return TRUE;
 783         }
 784         return FALSE;
 785     }
 786
 787     while (list)
 788     {
 789         while (*list == ' ') list++;
 790         if (!strncmp( list, ext, len ) && (!list[len] || list[len] == ' ')) return TRUE;
 791         list = strchr( list, ' ' );
 792     }
 793     return FALSE;
 794 }
 795
 796 static int compar(const void *elt_a, const void *elt_b) {
 797   return strcmp(((const OpenGL_extension *) elt_a)->name,
 798                 ((const OpenGL_extension *) elt_b)->name);
 799 }
 800
 801 /* Check if a GL extension is supported */
 802 static BOOL is_extension_supported(const char* extension)
 803 {
 804     enum wgl_handle_type type = get_current_context_type();
 805     const struct opengl_funcs *funcs = NtCurrentTeb()->glTable;
 806     const char *gl_ext_string = NULL;
 807     size_t len;
 808
 809     TRACE("Checking for extension '%s'\n", extension);
 810
 811     if (type == HANDLE_CONTEXT)
 812     {
 813         gl_ext_string = (const char*)glGetString(GL_EXTENSIONS);
 814         if (!gl_ext_string)
 815         {
 816             ERR("No OpenGL extensions found, check if your OpenGL setup is correct!\n");
 817             return FALSE;
 818         }
 819     }
 820
 821     /* We use the GetProcAddress function from the display driver to retrieve function pointers
 822      * for OpenGL and WGL extensions. In case of winex11.drv the OpenGL extension lookup is done
 823      * using glXGetProcAddress. This function is quite unreliable in the sense that its specs don't
 824      * require the function to return NULL when an extension isn't found. For this reason we check
 825      * if the OpenGL extension required for the function we are looking up is supported. */
 826
 827     while ((len = strcspn(extension, " ")) != 0)
 828     {
 829         /* Check if the extension is part of the GL extension string to see if it is supported. */
 830         if (has_extension(gl_ext_string, extension, len))
 831             return TRUE;
 832
 833         /* In general an OpenGL function starts as an ARB/EXT extension and at some stage
 834          * it becomes part of the core OpenGL library and can be reached without the ARB/EXT
 835          * suffix as well. In the extension table, these functions contain GL_VERSION_major_minor.
 836          * Check if we are searching for a core GL function */
 837         if(strncmp(extension, "GL_VERSION_", 11) == 0)
 838         {
 839             const GLubyte *gl_version = funcs->gl.p_glGetString(GL_VERSION);
 840             const char *version = extension + 11; /* Move past 'GL_VERSION_' */
 841
 842             if(!gl_version) {
 843                 ERR("No OpenGL version found!\n");
 844                 return FALSE;
 845             }
 846
 847             /* Compare the major/minor version numbers of the native OpenGL library and what is required by the function.
 848              * The gl_version string is guaranteed to have at least a major/minor and sometimes it has a release number as well. */
 849             if( (gl_version[0] > version[0]) || ((gl_version[0] == version[0]) && (gl_version[2] >= version[2])) ) {
 850                 return TRUE;
 851             }
 852             WARN("The function requires OpenGL version '%c.%c' while your drivers only provide '%c.%c'\n", version[0], version[2], gl_version[0], gl_version[2]);
 853         }
 854
 855         if (extension[len] == ' ') len++;
 856         extension += len;
 857     }
 858
 859     return FALSE;
 860 }
 861
 862 /***********************************************************************
 863  *              wglGetProcAddress (OPENGL32.@)
 864  */
 865 PROC WINAPI wglGetProcAddress( LPCSTR name )
 866 {
 867     struct opengl_funcs *funcs = NtCurrentTeb()->glTable;
 868     void **func_ptr;
 869     OpenGL_extension  ext;
 870     const OpenGL_extension *ext_ret;
 871
 872     if (!name) return NULL;
 873
 874     /* Without an active context opengl32 doesn't know to what
 875      * driver it has to dispatch wglGetProcAddress.
 876      */
 877     if (!get_current_context_ptr())
 878     {
 879         WARN("No active WGL context found\n");
 880         return NULL;
 881     }
 882
 883     ext.name = name;
 884     ext_ret = bsearch(&ext, extension_registry, extension_registry_size, sizeof(ext), compar);
 885     if (!ext_ret)
 886     {
 887         WARN("Function %s unknown\n", name);
 888         return NULL;
 889     }
 890
 891     func_ptr = (void **)&funcs->ext + (ext_ret - extension_registry);
 892     if (!*func_ptr)
 893     {
 894         void *driver_func = funcs->wgl.p_wglGetProcAddress( name );
 895
 896         if (!is_extension_supported(ext_ret->extension))
 897         {
 898             unsigned int i;
 899             static const struct { const char *name, *alt; } alternatives[] =
 900             {
 901                 { "glCopyTexSubImage3DEXT", "glCopyTexSubImage3D" },     /* needed by RuneScape */
 902                 { "glVertexAttribDivisor", "glVertexAttribDivisorARB"},  /* needed by Caffeine */
 903             };
 904
 905             for (i = 0; i < ARRAY_SIZE(alternatives); i++)
 906             {
 907                 if (strcmp( name, alternatives[i].name )) continue;
 908                 WARN("Extension %s required for %s not supported, trying %s\n",
 909                     ext_ret->extension, name, alternatives[i].alt );
 910                 return wglGetProcAddress( alternatives[i].alt );
 911             }
 912             WARN("Extension %s required for %s not supported\n", ext_ret->extension, name);
 913             return NULL;
 914         }
 915
 916         if (driver_func == NULL)
 917         {
 918             WARN("Function %s not supported by driver\n", name);
 919             return NULL;
 920         }
 921         *func_ptr = driver_func;
 922     }
 923
 924     TRACE("returning %s -> %p\n", name, ext_ret->func);
 925     return ext_ret->func;
 926 }
 927
 928 /***********************************************************************
 929  *              wglRealizeLayerPalette (OPENGL32.@)
 930  */
 931 BOOL WINAPI wglRealizeLayerPalette(HDC hdc,
 932                                    int iLayerPlane,
 933                                    BOOL bRealize) {
 934   FIXME("()\n");
 935
 936   return FALSE;
 937 }
 938
 939 /***********************************************************************
 940  *              wglSetLayerPaletteEntries (OPENGL32.@)
 941  */
 942 int WINAPI wglSetLayerPaletteEntries(HDC hdc,
 943                                      int iLayerPlane,
 944                                      int iStart,
 945                                      int cEntries,
 946                                      const COLORREF *pcr) {
 947   FIXME("(): stub!\n");
 948
 949   return 0;
 950 }
 951
 952 /***********************************************************************
 953  *              wglSwapLayerBuffers (OPENGL32.@)
 954  */
 955 BOOL WINAPI wglSwapLayerBuffers(HDC hdc,
 956                                 UINT fuPlanes) {
 957   TRACE("(%p, %08x)\n", hdc, fuPlanes);
 958
 959   if (fuPlanes & WGL_SWAP_MAIN_PLANE) {
 960     if (!wglSwapBuffers( hdc )) return FALSE;
 961     fuPlanes &= ~WGL_SWAP_MAIN_PLANE;
 962   }
 963
 964   if (fuPlanes) {
 965     WARN("Following layers unhandled: %08x\n", fuPlanes);
 966   }
 967
 968   return TRUE;
 969 }
 970
 971 /***********************************************************************
 972  *              wglBindTexImageARB
 973  *
 974  * Provided by the WGL_ARB_render_texture extension.
 975  */
 976 BOOL WINAPI wglBindTexImageARB( HPBUFFERARB handle, int buffer )
 977 {
 978     struct wgl_handle *ptr = get_handle_ptr( handle, HANDLE_PBUFFER );
 979     BOOL ret;
 980
 981     if (!ptr) return FALSE;
 982     ret = ptr->funcs->ext.p_wglBindTexImageARB( ptr->u.pbuffer, buffer );
 983     release_handle_ptr( ptr );
 984     return ret;
 985 }
 986
 987 /***********************************************************************
 988  *              wglReleaseTexImageARB
 989  *
 990  * Provided by the WGL_ARB_render_texture extension.
 991  */
 992 BOOL WINAPI wglReleaseTexImageARB( HPBUFFERARB handle, int buffer )
 993 {
 994     struct wgl_handle *ptr = get_handle_ptr( handle, HANDLE_PBUFFER );
 995     BOOL ret;
 996
 997     if (!ptr) return FALSE;
 998     ret = ptr->funcs->ext.p_wglReleaseTexImageARB( ptr->u.pbuffer, buffer );
 999     release_handle_ptr( ptr );
1000     return ret;
1001 }
1002
1003 /***********************************************************************
1004  *              wglSetPbufferAttribARB
1005  *
1006  * Provided by the WGL_ARB_render_texture extension.
1007  */
1008 BOOL WINAPI wglSetPbufferAttribARB( HPBUFFERARB handle, const int *attribs )
1009 {
1010     struct wgl_handle *ptr = get_handle_ptr( handle, HANDLE_PBUFFER );
1011     BOOL ret;
1012
1013     if (!ptr) return FALSE;
1014     ret = ptr->funcs->ext.p_wglSetPbufferAttribARB( ptr->u.pbuffer, attribs );
1015     release_handle_ptr( ptr );
1016     return ret;
1017 }
1018
1019 /***********************************************************************
1020  *              wglCreatePbufferARB
1021  *
1022  * Provided by the WGL_ARB_pbuffer extension.
1023  */
1024 HPBUFFERARB WINAPI wglCreatePbufferARB( HDC hdc, int format, int width, int height, const int *attribs )
1025 {
1026     HPBUFFERARB ret;
1027     struct wgl_pbuffer *pbuffer;
1028     struct opengl_funcs *funcs = get_dc_funcs( hdc );
1029
1030     if (!funcs || !funcs->ext.p_wglCreatePbufferARB) return 0;
1031     if (!(pbuffer = funcs->ext.p_wglCreatePbufferARB( hdc, format, width, height, attribs ))) return 0;
1032     ret = alloc_handle( HANDLE_PBUFFER, funcs, pbuffer );
1033     if (!ret) funcs->ext.p_wglDestroyPbufferARB( pbuffer );
1034     return ret;
1035 }
1036
1037 /***********************************************************************
1038  *              wglGetPbufferDCARB
1039  *
1040  * Provided by the WGL_ARB_pbuffer extension.
1041  */
1042 HDC WINAPI wglGetPbufferDCARB( HPBUFFERARB handle )
1043 {
1044     struct wgl_handle *ptr = get_handle_ptr( handle, HANDLE_PBUFFER );
1045     HDC ret;
1046
1047     if (!ptr) return 0;
1048     ret = ptr->funcs->ext.p_wglGetPbufferDCARB( ptr->u.pbuffer );
1049     release_handle_ptr( ptr );
1050     return ret;
1051 }
1052
1053 /***********************************************************************
1054  *              wglReleasePbufferDCARB
1055  *
1056  * Provided by the WGL_ARB_pbuffer extension.
1057  */
1058 int WINAPI wglReleasePbufferDCARB( HPBUFFERARB handle, HDC hdc )
1059 {
1060     struct wgl_handle *ptr = get_handle_ptr( handle, HANDLE_PBUFFER );
1061     BOOL ret;
1062
1063     if (!ptr) return FALSE;
1064     ret = ptr->funcs->ext.p_wglReleasePbufferDCARB( ptr->u.pbuffer, hdc );
1065     release_handle_ptr( ptr );
1066     return ret;
1067 }
1068
1069 /***********************************************************************
1070  *              wglDestroyPbufferARB
1071  *
1072  * Provided by the WGL_ARB_pbuffer extension.
1073  */
1074 BOOL WINAPI wglDestroyPbufferARB( HPBUFFERARB handle )
1075 {
1076     struct wgl_handle *ptr = get_handle_ptr( handle, HANDLE_PBUFFER );
1077
1078     if (!ptr) return FALSE;
1079     ptr->funcs->ext.p_wglDestroyPbufferARB( ptr->u.pbuffer );
1080     free_handle_ptr( ptr );
1081     return TRUE;
1082 }
1083
1084 /***********************************************************************
1085  *              wglQueryPbufferARB
1086  *
1087  * Provided by the WGL_ARB_pbuffer extension.
1088  */
1089 BOOL WINAPI wglQueryPbufferARB( HPBUFFERARB handle, int attrib, int *value )
1090 {
1091     struct wgl_handle *ptr = get_handle_ptr( handle, HANDLE_PBUFFER );
1092     BOOL ret;
1093
1094     if (!ptr) return FALSE;
1095     ret = ptr->funcs->ext.p_wglQueryPbufferARB( ptr->u.pbuffer, attrib, value );
1096     release_handle_ptr( ptr );
1097     return ret;
1098 }
1099
1100 /***********************************************************************
1101  *              wglUseFontBitmaps_common
1102  */
1103 static BOOL wglUseFontBitmaps_common( HDC hdc, DWORD first, DWORD count, DWORD listBase, BOOL unicode )
1104 {
1105     const struct opengl_funcs *funcs = NtCurrentTeb()->glTable;
1106      GLYPHMETRICS gm;
1107      unsigned int glyph, size = 0;
1108      void *bitmap = NULL, *gl_bitmap = NULL;
1109      int org_alignment;
1110      BOOL ret = TRUE;
1111
1112      funcs->gl.p_glGetIntegerv(GL_UNPACK_ALIGNMENT, &org_alignment);
1113      funcs->gl.p_glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
1114
1115      for (glyph = first; glyph < first + count; glyph++) {
1116          unsigned int needed_size, height, width, width_int;
1117
1118          if (unicode)
1119              needed_size = GetGlyphOutlineW(hdc, glyph, GGO_BITMAP, &gm, 0, NULL, &identity);
1120          else
1121              needed_size = GetGlyphOutlineA(hdc, glyph, GGO_BITMAP, &gm, 0, NULL, &identity);
1122
1123          TRACE("Glyph: %3d / List: %d size %d\n", glyph, listBase, needed_size);
1124          if (needed_size == GDI_ERROR) {
1125              ret = FALSE;
1126              break;
1127          }
1128
1129          if (needed_size > size) {
1130              size = needed_size;
1131              HeapFree(GetProcessHeap(), 0, bitmap);
1132              HeapFree(GetProcessHeap(), 0, gl_bitmap);
1133              bitmap = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, size);
1134              gl_bitmap = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, size);
1135          }
1136          if (needed_size != 0) {
1137              if (unicode)
1138                  ret = (GetGlyphOutlineW(hdc, glyph, GGO_BITMAP, &gm,
1139                                          size, bitmap, &identity) != GDI_ERROR);
1140              else
1141                  ret = (GetGlyphOutlineA(hdc, glyph, GGO_BITMAP, &gm,
1142                                          size, bitmap, &identity) != GDI_ERROR);
1143              if (!ret) break;
1144          }
1145
1146          if (TRACE_ON(wgl)) {
1147              unsigned int bitmask;
1148              unsigned char *bitmap_ = bitmap;
1149
1150              TRACE("  - bbox: %d x %d\n", gm.gmBlackBoxX, gm.gmBlackBoxY);
1151              TRACE("  - origin: (%d, %d)\n", gm.gmptGlyphOrigin.x, gm.gmptGlyphOrigin.y);
1152              TRACE("  - increment: %d - %d\n", gm.gmCellIncX, gm.gmCellIncY);
1153              if (needed_size != 0) {
1154                  TRACE("  - bitmap:\n");
1155                  for (height = 0; height < gm.gmBlackBoxY; height++) {
1156                      TRACE("      ");
1157                      for (width = 0, bitmask = 0x80; width < gm.gmBlackBoxX; width++, bitmask >>= 1) {
1158                          if (bitmask == 0) {
1159                              bitmap_ += 1;
1160                              bitmask = 0x80;
1161                          }
1162                          if (*bitmap_ & bitmask)
1163                              TRACE("*");
1164                          else
1165                              TRACE(" ");
1166                      }
1167                      bitmap_ += (4 - ((UINT_PTR)bitmap_ & 0x03));
1168                      TRACE("\n");
1169                  }
1170              }
1171          }
1172
1173          /* In OpenGL, the bitmap is drawn from the bottom to the top... So we need to invert the
1174          * glyph for it to be drawn properly.
1175          */
1176          if (needed_size != 0) {
1177              width_int = (gm.gmBlackBoxX + 31) / 32;
1178              for (height = 0; height < gm.gmBlackBoxY; height++) {
1179                  for (width = 0; width < width_int; width++) {
1180                      ((int *) gl_bitmap)[(gm.gmBlackBoxY - height - 1) * width_int + width] =
1181                      ((int *) bitmap)[height * width_int + width];
1182                  }
1183              }
1184          }
1185
1186          funcs->gl.p_glNewList(listBase++, GL_COMPILE);
1187          if (needed_size != 0) {
1188              funcs->gl.p_glBitmap(gm.gmBlackBoxX, gm.gmBlackBoxY,
1189                      0 - gm.gmptGlyphOrigin.x, (int) gm.gmBlackBoxY - gm.gmptGlyphOrigin.y,
1190                      gm.gmCellIncX, gm.gmCellIncY,
1191                      gl_bitmap);
1192          } else {
1193              /* This is the case of 'empty' glyphs like the space character */
1194              funcs->gl.p_glBitmap(0, 0, 0, 0, gm.gmCellIncX, gm.gmCellIncY, NULL);
1195          }
1196          funcs->gl.p_glEndList();
1197      }
1198
1199      funcs->gl.p_glPixelStorei(GL_UNPACK_ALIGNMENT, org_alignment);
1200      HeapFree(GetProcessHeap(), 0, bitmap);
1201      HeapFree(GetProcessHeap(), 0, gl_bitmap);
1202      return ret;
1203 }
1204
1205 /***********************************************************************
1206  *              wglUseFontBitmapsA (OPENGL32.@)
1207  */
1208 BOOL WINAPI wglUseFontBitmapsA(HDC hdc, DWORD first, DWORD count, DWORD listBase)
1209 {
1210     return wglUseFontBitmaps_common( hdc, first, count, listBase, FALSE );
1211 }
1212
1213 /***********************************************************************
1214  *              wglUseFontBitmapsW (OPENGL32.@)
1215  */
1216 BOOL WINAPI wglUseFontBitmapsW(HDC hdc, DWORD first, DWORD count, DWORD listBase)
1217 {
1218     return wglUseFontBitmaps_common( hdc, first, count, listBase, TRUE );
1219 }
1220
1221 static void fixed_to_double(POINTFX fixed, UINT em_size, GLdouble vertex[3])
1222 {
1223     vertex[0] = (fixed.x.value + (GLdouble)fixed.x.fract / (1 << 16)) / em_size;
1224     vertex[1] = (fixed.y.value + (GLdouble)fixed.y.fract / (1 << 16)) / em_size;
1225     vertex[2] = 0.0;
1226 }
1227
1228 static void WINAPI tess_callback_vertex(GLvoid *vertex)
1229 {
1230     const struct opengl_funcs *funcs = NtCurrentTeb()->glTable;
1231     GLdouble *dbl = vertex;
1232     TRACE("%f, %f, %f\n", dbl[0], dbl[1], dbl[2]);
1233     funcs->gl.p_glVertex3dv(vertex);
1234 }
1235
1236 static void WINAPI tess_callback_begin(GLenum which)
1237 {
1238     const struct opengl_funcs *funcs = NtCurrentTeb()->glTable;
1239     TRACE("%d\n", which);
1240     funcs->gl.p_glBegin(which);
1241 }
1242
1243 static void WINAPI tess_callback_end(void)
1244 {
1245     const struct opengl_funcs *funcs = NtCurrentTeb()->glTable;
1246     TRACE("\n");
1247     funcs->gl.p_glEnd();
1248 }
1249
1250 typedef struct _bezier_vector {
1251     GLdouble x;
1252     GLdouble y;
1253 } bezier_vector;
1254
1255 static double bezier_deviation_squared(const bezier_vector *p)
1256 {
1257     bezier_vector deviation;
1258     bezier_vector vertex;
1259     bezier_vector base;
1260     double base_length;
1261     double dot;
1262
1263     vertex.x = (p[0].x + p[1].x*2 + p[2].x)/4 - p[0].x;
1264     vertex.y = (p[0].y + p[1].y*2 + p[2].y)/4 - p[0].y;
1265
1266     base.x = p[2].x - p[0].x;
1267     base.y = p[2].y - p[0].y;
1268
1269     base_length = sqrt(base.x*base.x + base.y*base.y);
1270     base.x /= base_length;
1271     base.y /= base_length;
1272
1273     dot = base.x*vertex.x + base.y*vertex.y;
1274     dot = min(max(dot, 0.0), base_length);
1275     base.x *= dot;
1276     base.y *= dot;
1277
1278     deviation.x = vertex.x-base.x;
1279     deviation.y = vertex.y-base.y;
1280
1281     return deviation.x*deviation.x + deviation.y*deviation.y;
1282 }
1283
1284 static int bezier_approximate(const bezier_vector *p, bezier_vector *points, FLOAT deviation)
1285 {
1286     bezier_vector first_curve[3];
1287     bezier_vector second_curve[3];
1288     bezier_vector vertex;
1289     int total_vertices;
1290
1291     if(bezier_deviation_squared(p) <= deviation*deviation)
1292     {
1293         if(points)
1294             *points = p[2];
1295         return 1;
1296     }
1297
1298     vertex.x = (p[0].x + p[1].x*2 + p[2].x)/4;
1299     vertex.y = (p[0].y + p[1].y*2 + p[2].y)/4;
1300
1301     first_curve[0] = p[0];
1302     first_curve[1].x = (p[0].x + p[1].x)/2;
1303     first_curve[1].y = (p[0].y + p[1].y)/2;
1304     first_curve[2] = vertex;
1305
1306     second_curve[0] = vertex;
1307     second_curve[1].x = (p[2].x + p[1].x)/2;
1308     second_curve[1].y = (p[2].y + p[1].y)/2;
1309     second_curve[2] = p[2];
1310
1311     total_vertices = bezier_approximate(first_curve, points, deviation);
1312     if(points)
1313         points += total_vertices;
1314     total_vertices += bezier_approximate(second_curve, points, deviation);
1315     return total_vertices;
1316 }
1317
1318 /***********************************************************************
1319  *              wglUseFontOutlines_common
1320  */
1321 static BOOL wglUseFontOutlines_common(HDC hdc,
1322                                       DWORD first,
1323                                       DWORD count,
1324                                       DWORD listBase,
1325                                       FLOAT deviation,
1326                                       FLOAT extrusion,
1327                                       int format,
1328                                       LPGLYPHMETRICSFLOAT lpgmf,
1329                                       BOOL unicode)
1330 {
1331     const struct opengl_funcs *funcs = NtCurrentTeb()->glTable;
1332     UINT glyph;
1333     GLUtesselator *tess = NULL;
1334     LOGFONTW lf;
1335     HFONT old_font, unscaled_font;
1336     UINT em_size = 1024;
1337     RECT rc;
1338
1339     TRACE("(%p, %d, %d, %d, %f, %f, %d, %p, %s)\n", hdc, first, count,
1340           listBase, deviation, extrusion, format, lpgmf, unicode ? "W" : "A");
1341
1342     if(deviation <= 0.0)
1343         deviation = 1.0/em_size;
1344
1345     if(format == WGL_FONT_POLYGONS)
1346     {
1347         tess = gluNewTess();
1348         if(!tess)
1349         {
1350             ERR("glu32 is required for this function but isn't available\n");
1351             return FALSE;
1352         }
1353         gluTessCallback(tess, GLU_TESS_VERTEX, (void *)tess_callback_vertex);
1354         gluTessCallback(tess, GLU_TESS_BEGIN, (void *)tess_callback_begin);
1355         gluTessCallback(tess, GLU_TESS_END, tess_callback_end);
1356     }
1357
1358     GetObjectW(GetCurrentObject(hdc, OBJ_FONT), sizeof(lf), &lf);
1359     rc.left = rc.right = rc.bottom = 0;
1360     rc.top = em_size;
1361     DPtoLP(hdc, (POINT*)&rc, 2);
1362     lf.lfHeight = -abs(rc.top - rc.bottom);
1363     lf.lfOrientation = lf.lfEscapement = 0;
1364     unscaled_font = CreateFontIndirectW(&lf);
1365     old_font = SelectObject(hdc, unscaled_font);
1366
1367     for (glyph = first; glyph < first + count; glyph++)
1368     {
1369         DWORD needed;
1370         GLYPHMETRICS gm;
1371         BYTE *buf;
1372         TTPOLYGONHEADER *pph;
1373         TTPOLYCURVE *ppc;
1374         GLdouble *vertices = NULL;
1375         int vertex_total = -1;
1376
1377         if(unicode)
1378             needed = GetGlyphOutlineW(hdc, glyph, GGO_NATIVE, &gm, 0, NULL, &identity);
1379         else
1380             needed = GetGlyphOutlineA(hdc, glyph, GGO_NATIVE, &gm, 0, NULL, &identity);
1381
1382         if(needed == GDI_ERROR)
1383             goto error;
1384
1385         buf = HeapAlloc(GetProcessHeap(), 0, needed);
1386
1387         if(unicode)
1388             GetGlyphOutlineW(hdc, glyph, GGO_NATIVE, &gm, needed, buf, &identity);
1389         else
1390             GetGlyphOutlineA(hdc, glyph, GGO_NATIVE, &gm, needed, buf, &identity);
1391
1392         TRACE("glyph %d\n", glyph);
1393
1394         if(lpgmf)
1395         {
1396             lpgmf->gmfBlackBoxX = (float)gm.gmBlackBoxX / em_size;
1397             lpgmf->gmfBlackBoxY = (float)gm.gmBlackBoxY / em_size;
1398             lpgmf->gmfptGlyphOrigin.x = (float)gm.gmptGlyphOrigin.x / em_size;
1399             lpgmf->gmfptGlyphOrigin.y = (float)gm.gmptGlyphOrigin.y / em_size;
1400             lpgmf->gmfCellIncX = (float)gm.gmCellIncX / em_size;
1401             lpgmf->gmfCellIncY = (float)gm.gmCellIncY / em_size;
1402
1403             TRACE("%fx%f at %f,%f inc %f,%f\n", lpgmf->gmfBlackBoxX, lpgmf->gmfBlackBoxY,
1404                   lpgmf->gmfptGlyphOrigin.x, lpgmf->gmfptGlyphOrigin.y, lpgmf->gmfCellIncX, lpgmf->gmfCellIncY);
1405             lpgmf++;
1406         }
1407
1408         funcs->gl.p_glNewList(listBase++, GL_COMPILE);
1409         funcs->gl.p_glFrontFace(GL_CCW);
1410         if(format == WGL_FONT_POLYGONS)
1411         {
1412             funcs->gl.p_glNormal3d(0.0, 0.0, 1.0);
1413             gluTessNormal(tess, 0, 0, 1);
1414             gluTessBeginPolygon(tess, NULL);
1415         }
1416
1417         while(!vertices)
1418         {
1419             if(vertex_total != -1)
1420                 vertices = HeapAlloc(GetProcessHeap(), 0, vertex_total * 3 * sizeof(GLdouble));
1421             vertex_total = 0;
1422
1423             pph = (TTPOLYGONHEADER*)buf;
1424             while((BYTE*)pph < buf + needed)
1425             {
1426                 GLdouble previous[3];
1427                 fixed_to_double(pph->pfxStart, em_size, previous);
1428
1429                 if(vertices)
1430                     TRACE("\tstart %d, %d\n", pph->pfxStart.x.value, pph->pfxStart.y.value);
1431
1432                 if(format == WGL_FONT_POLYGONS)
1433                     gluTessBeginContour(tess);
1434                 else
1435                     funcs->gl.p_glBegin(GL_LINE_LOOP);
1436
1437                 if(vertices)
1438                 {
1439                     fixed_to_double(pph->pfxStart, em_size, vertices);
1440                     if(format == WGL_FONT_POLYGONS)
1441                         gluTessVertex(tess, vertices, vertices);
1442                     else
1443                         funcs->gl.p_glVertex3d(vertices[0], vertices[1], vertices[2]);
1444                     vertices += 3;
1445                 }
1446                 vertex_total++;
1447
1448                 ppc = (TTPOLYCURVE*)((char*)pph + sizeof(*pph));
1449                 while((char*)ppc < (char*)pph + pph->cb)
1450                 {
1451                     int i, j;
1452                     int num;
1453
1454                     switch(ppc->wType) {
1455                     case TT_PRIM_LINE:
1456                         for(i = 0; i < ppc->cpfx; i++)
1457                         {
1458                             if(vertices)
1459                             {
1460                                 TRACE("\t\tline to %d, %d\n",
1461                                       ppc->apfx[i].x.value, ppc->apfx[i].y.value);
1462                                 fixed_to_double(ppc->apfx[i], em_size, vertices);
1463                                 if(format == WGL_FONT_POLYGONS)
1464                                     gluTessVertex(tess, vertices, vertices);
1465                                 else
1466                                     funcs->gl.p_glVertex3d(vertices[0], vertices[1], vertices[2]);
1467                                 vertices += 3;
1468                             }
1469                             fixed_to_double(ppc->apfx[i], em_size, previous);
1470                             vertex_total++;
1471                         }
1472                         break;
1473
1474                     case TT_PRIM_QSPLINE:
1475                         for(i = 0; i < ppc->cpfx-1; i++)
1476                         {
1477                             bezier_vector curve[3];
1478                             bezier_vector *points;
1479                             GLdouble curve_vertex[3];
1480
1481                             if(vertices)
1482                                 TRACE("\t\tcurve  %d,%d %d,%d\n",
1483                                       ppc->apfx[i].x.value,     ppc->apfx[i].y.value,
1484                                       ppc->apfx[i + 1].x.value, ppc->apfx[i + 1].y.value);
1485
1486                             curve[0].x = previous[0];
1487                             curve[0].y = previous[1];
1488                             fixed_to_double(ppc->apfx[i], em_size, curve_vertex);
1489                             curve[1].x = curve_vertex[0];
1490                             curve[1].y = curve_vertex[1];
1491                             fixed_to_double(ppc->apfx[i + 1], em_size, curve_vertex);
1492                             curve[2].x = curve_vertex[0];
1493                             curve[2].y = curve_vertex[1];
1494                             if(i < ppc->cpfx-2)
1495                             {
1496                                 curve[2].x = (curve[1].x + curve[2].x)/2;
1497                                 curve[2].y = (curve[1].y + curve[2].y)/2;
1498                             }
1499                             num = bezier_approximate(curve, NULL, deviation);
1500                             points = HeapAlloc(GetProcessHeap(), 0, num*sizeof(bezier_vector));
1501                             num = bezier_approximate(curve, points, deviation);
1502                             vertex_total += num;
1503                             if(vertices)
1504                             {
1505                                 for(j=0; j<num; j++)
1506                                 {
1507                                     TRACE("\t\t\tvertex at %f,%f\n", points[j].x, points[j].y);
1508                                     vertices[0] = points[j].x;
1509                                     vertices[1] = points[j].y;
1510                                     vertices[2] = 0.0;
1511                                     if(format == WGL_FONT_POLYGONS)
1512                                         gluTessVertex(tess, vertices, vertices);
1513                                     else
1514                                         funcs->gl.p_glVertex3d(vertices[0], vertices[1], vertices[2]);
1515                                     vertices += 3;
1516                                 }
1517                             }
1518                             HeapFree(GetProcessHeap(), 0, points);
1519                             previous[0] = curve[2].x;
1520                             previous[1] = curve[2].y;
1521                         }
1522                         break;
1523                     default:
1524                         ERR("\t\tcurve type = %d\n", ppc->wType);
1525                         if(format == WGL_FONT_POLYGONS)
1526                             gluTessEndContour(tess);
1527                         else
1528                             funcs->gl.p_glEnd();
1529                         goto error_in_list;
1530                     }
1531
1532                     ppc = (TTPOLYCURVE*)((char*)ppc + sizeof(*ppc) +
1533                                          (ppc->cpfx - 1) * sizeof(POINTFX));
1534                 }
1535                 if(format == WGL_FONT_POLYGONS)
1536                     gluTessEndContour(tess);
1537                 else
1538                     funcs->gl.p_glEnd();
1539                 pph = (TTPOLYGONHEADER*)((char*)pph + pph->cb);
1540             }
1541         }
1542
1543 error_in_list:
1544         if(format == WGL_FONT_POLYGONS)
1545             gluTessEndPolygon(tess);
1546         funcs->gl.p_glTranslated((GLdouble)gm.gmCellIncX / em_size, (GLdouble)gm.gmCellIncY / em_size, 0.0);
1547         funcs->gl.p_glEndList();
1548         HeapFree(GetProcessHeap(), 0, buf);
1549         HeapFree(GetProcessHeap(), 0, vertices);
1550     }
1551
1552  error:
1553     DeleteObject(SelectObject(hdc, old_font));
1554     if(format == WGL_FONT_POLYGONS)
1555         gluDeleteTess(tess);
1556     return TRUE;
1557
1558 }
1559
1560 /***********************************************************************
1561  *              wglUseFontOutlinesA (OPENGL32.@)
1562  */
1563 BOOL WINAPI wglUseFontOutlinesA(HDC hdc,
1564                                 DWORD first,
1565                                 DWORD count,
1566                                 DWORD listBase,
1567                                 FLOAT deviation,
1568                                 FLOAT extrusion,
1569                                 int format,
1570                                 LPGLYPHMETRICSFLOAT lpgmf)
1571 {
1572     return wglUseFontOutlines_common(hdc, first, count, listBase, deviation, extrusion, format, lpgmf, FALSE);
1573 }
1574
1575 /***********************************************************************
1576  *              wglUseFontOutlinesW (OPENGL32.@)
1577  */
1578 BOOL WINAPI wglUseFontOutlinesW(HDC hdc,
1579                                 DWORD first,
1580                                 DWORD count,
1581                                 DWORD listBase,
1582                                 FLOAT deviation,
1583                                 FLOAT extrusion,
1584                                 int format,
1585                                 LPGLYPHMETRICSFLOAT lpgmf)
1586 {
1587     return wglUseFontOutlines_common(hdc, first, count, listBase, deviation, extrusion, format, lpgmf, TRUE);
1588 }
1589
1590 /***********************************************************************
1591  *              glDebugEntry (OPENGL32.@)
1592  */
1593 GLint WINAPI glDebugEntry( GLint unknown1, GLint unknown2 )
1594 {
1595     return 0;
1596 }
1597
1598 static GLubyte *filter_extensions_list(const char *extensions, const char *disabled)
1599 {
1600     char *p, *str;
1601     const char *end;
1602
1603     p = str = HeapAlloc(GetProcessHeap(), 0, strlen(extensions) + 2);
1604     if (!str)
1605         return NULL;
1606
1607     TRACE( "GL_EXTENSIONS:\n" );
1608
1609     for (;;)
1610     {
1611         while (*extensions == ' ')
1612             extensions++;
1613         if (!*extensions)
1614             break;
1615         if (!(end = strchr(extensions, ' ')))
1616             end = extensions + strlen(extensions);
1617         memcpy(p, extensions, end - extensions);
1618         p[end - extensions] = 0;
1619         if (!has_extension(disabled, p, strlen(p)))
1620         {
1621             TRACE("++ %s\n", p);
1622             p += end - extensions;
1623             *p++ = ' ';
1624         }
1625         else
1626         {
1627             TRACE("-- %s (disabled by config)\n", p);
1628         }
1629         extensions = end;
1630     }
1631     *p = 0;
1632     return (GLubyte *)str;
1633 }
1634
1635 static GLuint *filter_extensions_index(const char *disabled)
1636 {
1637     const struct opengl_funcs *funcs = NtCurrentTeb()->glTable;
1638     const char *ext, *end, *gl_ext;
1639     GLuint *disabled_exts, *new_disabled_exts;
1640     unsigned int i = 0, j, disabled_size;
1641     GLint extensions_count;
1642
1643     if (!funcs->ext.p_glGetStringi)
1644     {
1645         void **func_ptr = (void **)&funcs->ext.p_glGetStringi;
1646
1647         *func_ptr = funcs->wgl.p_wglGetProcAddress("glGetStringi");
1648         if (!funcs->ext.p_glGetStringi)
1649             return NULL;
1650     }
1651
1652     funcs->gl.p_glGetIntegerv(GL_NUM_EXTENSIONS, &extensions_count);
1653     disabled_size = 2;
1654     disabled_exts = HeapAlloc(GetProcessHeap(), 0, disabled_size * sizeof(*disabled_exts));
1655     if (!disabled_exts)
1656         return NULL;
1657
1658     TRACE( "GL_EXTENSIONS:\n" );
1659
1660     for (j = 0; j < extensions_count; ++j)
1661     {
1662         gl_ext = (const char *)funcs->ext.p_glGetStringi(GL_EXTENSIONS, j);
1663         ext = disabled;
1664         for (;;)
1665         {
1666             while (*ext == ' ')
1667                 ext++;
1668             if (!*ext)
1669             {
1670                 TRACE("++ %s\n", gl_ext);
1671                 break;
1672             }
1673             if (!(end = strchr(ext, ' ')))
1674                 end = ext + strlen(ext);
1675
1676             if (!strncmp(gl_ext, ext, end - ext) && !gl_ext[end - ext])
1677             {
1678                 if (i + 1 == disabled_size)
1679                 {
1680                     disabled_size *= 2;
1681                     new_disabled_exts = HeapReAlloc(GetProcessHeap(), 0, disabled_exts,
1682                                                     disabled_size * sizeof(*disabled_exts));
1683                     if (!new_disabled_exts)
1684                     {
1685                         disabled_exts[i] = ~0u;
1686                         return disabled_exts;
1687                     }
1688                     disabled_exts = new_disabled_exts;
1689                 }
1690                 TRACE("-- %s (disabled by config)\n", gl_ext);
1691                 disabled_exts[i++] = j;
1692                 break;
1693             }
1694             ext = end;
1695         }
1696     }
1697     disabled_exts[i] = ~0u;
1698     return disabled_exts;
1699 }
1700
1701 /* build the extension string by filtering out the disabled extensions */
1702 static BOOL filter_extensions(const char *extensions, GLubyte **exts_list, GLuint **disabled_exts)
1703 {
1704     static const char *disabled;
1705
1706     if (!disabled)
1707     {
1708         HKEY hkey;
1709         DWORD size;
1710         char *str = NULL;
1711
1712         /* @@ Wine registry key: HKCU\Software\Wine\OpenGL */
1713         if (!RegOpenKeyA( HKEY_CURRENT_USER, "Software\\Wine\\OpenGL", &hkey ))
1714         {
1715             if (!RegQueryValueExA( hkey, "DisabledExtensions", 0, NULL, NULL, &size ))
1716             {
1717                 str = HeapAlloc( GetProcessHeap(), 0, size );
1718                 if (RegQueryValueExA( hkey, "DisabledExtensions", 0, NULL, (BYTE *)str, &size )) *str = 0;
1719             }
1720             RegCloseKey( hkey );
1721         }
1722         if (str)
1723         {
1724             if (InterlockedCompareExchangePointer( (void **)&disabled, str, NULL ))
1725                 HeapFree( GetProcessHeap(), 0, str );
1726         }
1727         else disabled = "";
1728     }
1729
1730     if (!disabled[0])
1731         return FALSE;
1732
1733     if (extensions && !*exts_list)
1734         *exts_list = filter_extensions_list(extensions, disabled);
1735
1736     if (!*disabled_exts)
1737         *disabled_exts = filter_extensions_index(disabled);
1738
1739     return (exts_list && *exts_list) || *disabled_exts;
1740 }
1741
1742 /***********************************************************************
1743  *              glGetString (OPENGL32.@)
1744  */
1745 const GLubyte * WINAPI glGetString( GLenum name )
1746 {
1747     const struct opengl_funcs *funcs = NtCurrentTeb()->glTable;
1748     const GLubyte *ret = funcs->gl.p_glGetString( name );
1749
1750     if (name == GL_EXTENSIONS && ret)
1751     {
1752         struct wgl_handle *ptr = get_current_context_ptr();
1753         if (ptr->u.context->extensions ||
1754             filter_extensions((const char *)ret, &ptr->u.context->extensions, &ptr->u.context->disabled_exts))
1755             ret = ptr->u.context->extensions;
1756     }
1757     return ret;
1758 }
1759
1760 /* wrapper for glDebugMessageCallback* functions */
1761 static void gl_debug_message_callback( GLenum source, GLenum type, GLuint id, GLenum severity,
1762                                        GLsizei length, const GLchar *message,const void *userParam )
1763 {
1764     struct wgl_handle *ptr = (struct wgl_handle *)userParam;
1765     if (!ptr->u.context->debug_callback) return;
1766     ptr->u.context->debug_callback( source, type, id, severity, length, message, ptr->u.context->debug_user );
1767 }
1768
1769 /***********************************************************************
1770  *      glDebugMessageCallback
1771  */
1772 void WINAPI glDebugMessageCallback( GLDEBUGPROC callback, const void *userParam )
1773 {
1774     struct wgl_handle *ptr = get_current_context_ptr();
1775     const struct opengl_funcs *funcs = NtCurrentTeb()->glTable;
1776
1777     TRACE( "(%p, %p)\n", callback, userParam );
1778
1779     ptr->u.context->debug_callback = callback;
1780     ptr->u.context->debug_user     = userParam;
1781     funcs->ext.p_glDebugMessageCallback( gl_debug_message_callback, ptr );
1782 }
1783
1784 /***********************************************************************
1785  *      glDebugMessageCallbackAMD
1786  */
1787 void WINAPI glDebugMessageCallbackAMD( GLDEBUGPROCAMD callback, void *userParam )
1788 {
1789     struct wgl_handle *ptr = get_current_context_ptr();
1790     const struct opengl_funcs *funcs = NtCurrentTeb()->glTable;
1791
1792     TRACE( "(%p, %p)\n", callback, userParam );
1793
1794     ptr->u.context->debug_callback = callback;
1795     ptr->u.context->debug_user     = userParam;
1796     funcs->ext.p_glDebugMessageCallbackAMD( gl_debug_message_callback, ptr );
1797 }
1798
1799 /***********************************************************************
1800  *      glDebugMessageCallbackARB
1801  */
1802 void WINAPI glDebugMessageCallbackARB( GLDEBUGPROCARB callback, const void *userParam )
1803 {
1804     struct wgl_handle *ptr = get_current_context_ptr();
1805     const struct opengl_funcs *funcs = NtCurrentTeb()->glTable;
1806
1807     TRACE( "(%p, %p)\n", callback, userParam );
1808
1809     ptr->u.context->debug_callback = callback;
1810     ptr->u.context->debug_user     = userParam;
1811     funcs->ext.p_glDebugMessageCallbackARB( gl_debug_message_callback, ptr );
1812 }
1813
1814 /***********************************************************************
1815  *           OpenGL initialisation routine
1816  */
1817 BOOL WINAPI DllMain( HINSTANCE hinst, DWORD reason, LPVOID reserved )
1818 {
1819     switch(reason)
1820     {
1821     case DLL_PROCESS_ATTACH:
1822         NtCurrentTeb()->glTable = &null_opengl_funcs;
1823         break;
1824     case DLL_THREAD_ATTACH:
1825         NtCurrentTeb()->glTable = &null_opengl_funcs;
1826         break;
1827     }
1828     return TRUE;
1829 }