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 #ifdef HAVE_GL_GLU_H
  38 #undef far
  39 #undef near
  40 #include <GL/glu.h>
  41 #endif
  42 #include "wine/library.h"
  43 #include "wine/debug.h"
  44
  45 WINE_DEFAULT_DEBUG_CHANNEL(wgl);
  46 WINE_DECLARE_DEBUG_CHANNEL(opengl);
  47
  48 typedef struct wine_wgl_s {
  49     PROC WINAPI  (*p_wglGetProcAddress)(LPCSTR  lpszProc);
  50
  51     void WINAPI  (*p_wglGetIntegerv)(GLenum pname, GLint* params);
  52     void WINAPI  (*p_wglFinish)(void);
  53     void WINAPI  (*p_wglFlush)(void);
  54 } wine_wgl_t;
  55
  56 /** global wgl object */
  57 static wine_wgl_t wine_wgl;
  58
  59 /* x11drv GDI escapes */
  60 #define X11DRV_ESCAPE 6789
  61 enum x11drv_escape_codes
  62 {
  63     X11DRV_GET_DISPLAY,         /* get X11 display for a DC */
  64     X11DRV_GET_DRAWABLE,        /* get current drawable for a DC */
  65     X11DRV_GET_FONT,            /* get current X font for a DC */
  66     X11DRV_SET_DRAWABLE,        /* set current drawable for a DC */
  67     X11DRV_START_EXPOSURES,     /* start graphics exposures */
  68     X11DRV_END_EXPOSURES,       /* end graphics exposures */
  69     X11DRV_GET_DCE,             /* get the DCE pointer */
  70     X11DRV_SET_DCE,             /* set the DCE pointer */
  71     X11DRV_GET_GLX_DRAWABLE,    /* get current glx drawable for a DC */
  72     X11DRV_SYNC_PIXMAP          /* sync the dibsection to its pixmap */
  73 };
  74
  75 void (*wine_tsx11_lock_ptr)(void) = NULL;
  76 void (*wine_tsx11_unlock_ptr)(void) = NULL;
  77
  78 static HMODULE opengl32_handle;
  79
  80 static char  internal_gl_disabled_extensions[512];
  81 static char* internal_gl_extensions = NULL;
  82
  83 typedef struct wine_glcontext {
  84   HDC hdc;
  85   XVisualInfo *vis;
  86   GLXFBConfig fb_conf;
  87   GLXContext ctx;
  88   BOOL do_escape;
  89   /* ... more stuff here */
  90 } Wine_GLContext;
  91
  92 void enter_gl(void)
  93 {
  94     Wine_GLContext *curctx = (Wine_GLContext *) NtCurrentTeb()->glContext;
  95
  96     if (curctx && curctx->do_escape)
  97     {
  98         enum x11drv_escape_codes escape = X11DRV_SYNC_PIXMAP;
  99         ExtEscape(curctx->hdc, X11DRV_ESCAPE, sizeof(escape), (LPCSTR)&escape, 0, NULL);
 100     }
 101
 102     wine_tsx11_lock_ptr();
 103     return;
 104 }
 105
 106 const GLubyte * WINAPI wine_glGetString( GLenum name );
 107
 108 /***********************************************************************
 109  *              wglCreateLayerContext (OPENGL32.@)
 110  */
 111 HGLRC WINAPI wglCreateLayerContext(HDC hdc,
 112                                    int iLayerPlane) {
 113   TRACE("(%p,%d)\n", hdc, iLayerPlane);
 114
 115   if (iLayerPlane == 0) {
 116       return wglCreateContext(hdc);
 117   }
 118   FIXME(" no handler for layer %d\n", iLayerPlane);
 119
 120   return NULL;
 121 }
 122
 123 /***********************************************************************
 124  *              wglDescribeLayerPlane (OPENGL32.@)
 125  */
 126 BOOL WINAPI wglDescribeLayerPlane(HDC hdc,
 127                                   int iPixelFormat,
 128                                   int iLayerPlane,
 129                                   UINT nBytes,
 130                                   LPLAYERPLANEDESCRIPTOR plpd) {
 131   FIXME("(%p,%d,%d,%d,%p)\n", hdc, iPixelFormat, iLayerPlane, nBytes, plpd);
 132
 133   return FALSE;
 134 }
 135
 136 /***********************************************************************
 137  *              wglGetLayerPaletteEntries (OPENGL32.@)
 138  */
 139 int WINAPI wglGetLayerPaletteEntries(HDC hdc,
 140                                      int iLayerPlane,
 141                                      int iStart,
 142                                      int cEntries,
 143                                      const COLORREF *pcr) {
 144   FIXME("(): stub !\n");
 145
 146   return 0;
 147 }
 148
 149 static int compar(const void *elt_a, const void *elt_b) {
 150   return strcmp(((const OpenGL_extension *) elt_a)->name,
 151                 ((const OpenGL_extension *) elt_b)->name);
 152 }
 153
 154 /* Check if a GL extension is supported */
 155 static BOOL is_extension_supported(const char* extension)
 156 {
 157     const char *gl_ext_string = (const char*)wine_glGetString(GL_EXTENSIONS);
 158
 159     TRACE("Checking for extension '%s'\n", extension);
 160
 161     if(!gl_ext_string) {
 162         ERR("No OpenGL extensions found, check if your OpenGL setup is correct!\n");
 163         return FALSE;
 164     }
 165
 166     /* We use the GetProcAddress function from the display driver to retrieve function pointers
 167      * for OpenGL and WGL extensions. In case of winex11.drv the OpenGL extension lookup is done
 168      * using glXGetProcAddress. This function is quite unreliable in the sense that its specs don't
 169      * require the function to return NULL when a extension isn't found. For this reason we check
 170      * if the OpenGL extension required for the function we are looking up is supported. */
 171
 172     /* Check if the extension is part of the GL extension string to see if it is supported. */
 173     if(strstr(gl_ext_string, extension) != NULL)
 174         return TRUE;
 175
 176     /* In general an OpenGL function starts as an ARB/EXT extension and at some stage
 177      * it becomes part of the core OpenGL library and can be reached without the ARB/EXT
 178      * suffix as well. In the extension table, these functions contain GL_VERSION_major_minor.
 179      * Check if we are searching for a core GL function */
 180     if(strncmp(extension, "GL_VERSION_", 11) == 0)
 181     {
 182         const GLubyte *gl_version = glGetString(GL_VERSION);
 183         const char *version = extension + 11; /* Move past 'GL_VERSION_' */
 184
 185         if(!gl_version) {
 186             ERR("Error no OpenGL version found,\n");
 187             return FALSE;
 188         }
 189
 190         /* Compare the major/minor version numbers of the native OpenGL library and what is required by the function.
 191          * The gl_version string is guaranteed to have at least a major/minor and sometimes it has a release number as well. */
 192         if( (gl_version[0] >= version[0]) || ((gl_version[0] == version[0]) && (gl_version[2] >= version[2])) ) {
 193             return TRUE;
 194         }
 195         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]);
 196     }
 197
 198     return FALSE;
 199 }
 200
 201 /***********************************************************************
 202  *              wglGetProcAddress (OPENGL32.@)
 203  */
 204 PROC WINAPI wglGetProcAddress(LPCSTR  lpszProc) {
 205   void *local_func;
 206   OpenGL_extension  ext;
 207   const OpenGL_extension *ext_ret;
 208
 209   TRACE("(%s)\n", lpszProc);
 210
 211   if(lpszProc == NULL)
 212     return NULL;
 213
 214   /* First, look if it's not already defined in the 'standard' OpenGL functions */
 215   if ((local_func = GetProcAddress(opengl32_handle, lpszProc)) != NULL) {
 216     TRACE(" found function in 'standard' OpenGL functions (%p)\n", local_func);
 217     return local_func;
 218   }
 219
 220   /* After that, search in the thunks to find the real name of the extension */
 221   ext.name = lpszProc;
 222   ext_ret = (const OpenGL_extension *) bsearch(&ext, extension_registry,
 223                                          extension_registry_size, sizeof(OpenGL_extension), compar);
 224
 225   /* If nothing was found, we are looking for a WGL extension or an unknown GL extension. */
 226   if (ext_ret == NULL) {
 227     /* If the function name starts with a w it is a WGL extension */
 228     if(lpszProc[0] == 'w')
 229       return wine_wgl.p_wglGetProcAddress(lpszProc);
 230
 231     /* We are dealing with an unknown GL extension. */
 232     WARN("Extension '%s' not defined in opengl32.dll's function table!\n", lpszProc);
 233     return NULL;
 234   } else { /* We are looking for an OpenGL extension */
 235
 236     /* Check if the GL extension required by the function is available */
 237     if(!is_extension_supported(ext_ret->extension)) {
 238         WARN("Extension '%s' required by function '%s' not supported!\n", ext_ret->extension, lpszProc);
 239     }
 240
 241     local_func = wine_wgl.p_wglGetProcAddress(ext_ret->name);
 242
 243     /* After that, look at the extensions defined in the Linux OpenGL library */
 244     if (local_func == NULL) {
 245       char buf[256];
 246       void *ret = NULL;
 247
 248       /* Remove the 3 last letters (EXT, ARB, ...).
 249
 250          I know that some extensions have more than 3 letters (MESA, NV,
 251          INTEL, ...), but this is only a stop-gap measure to fix buggy
 252          OpenGL drivers (moreover, it is only useful for old 1.0 apps
 253          that query the glBindTextureEXT extension).
 254       */
 255       memcpy(buf, ext_ret->name, strlen(ext_ret->name) - 3);
 256       buf[strlen(ext_ret->name) - 3] = '\0';
 257       TRACE(" extension not found in the Linux OpenGL library, checking against libGL bug with %s..\n", buf);
 258
 259       ret = GetProcAddress(opengl32_handle, buf);
 260       if (ret != NULL) {
 261         TRACE(" found function in main OpenGL library (%p) !\n", ret);
 262       } else {
 263         WARN("Did not find function %s (%s) in your OpenGL library !\n", lpszProc, ext_ret->name);
 264       }
 265
 266       return ret;
 267     } else {
 268       TRACE(" returning function  (%p)\n", ext_ret->func);
 269       extension_funcs[ext_ret - extension_registry] = local_func;
 270
 271       return ext_ret->func;
 272     }
 273   }
 274 }
 275
 276 /***********************************************************************
 277  *              wglRealizeLayerPalette (OPENGL32.@)
 278  */
 279 BOOL WINAPI wglRealizeLayerPalette(HDC hdc,
 280                                    int iLayerPlane,
 281                                    BOOL bRealize) {
 282   FIXME("()\n");
 283
 284   return FALSE;
 285 }
 286
 287 /***********************************************************************
 288  *              wglSetLayerPaletteEntries (OPENGL32.@)
 289  */
 290 int WINAPI wglSetLayerPaletteEntries(HDC hdc,
 291                                      int iLayerPlane,
 292                                      int iStart,
 293                                      int cEntries,
 294                                      const COLORREF *pcr) {
 295   FIXME("(): stub !\n");
 296
 297   return 0;
 298 }
 299
 300 /***********************************************************************
 301  *              wglSwapLayerBuffers (OPENGL32.@)
 302  */
 303 BOOL WINAPI wglSwapLayerBuffers(HDC hdc,
 304                                 UINT fuPlanes) {
 305   TRACE_(opengl)("(%p, %08x)\n", hdc, fuPlanes);
 306
 307   if (fuPlanes & WGL_SWAP_MAIN_PLANE) {
 308     if (!SwapBuffers(hdc)) return FALSE;
 309     fuPlanes &= ~WGL_SWAP_MAIN_PLANE;
 310   }
 311
 312   if (fuPlanes) {
 313     WARN("Following layers unhandled : %08x\n", fuPlanes);
 314   }
 315
 316   return TRUE;
 317 }
 318
 319 #ifdef HAVE_GL_GLU_H
 320
 321 static void fixed_to_double(POINTFX fixed, UINT em_size, GLdouble vertex[3])
 322 {
 323     vertex[0] = (fixed.x.value + (GLdouble)fixed.x.fract / (1 << 16)) / em_size;
 324     vertex[1] = (fixed.y.value + (GLdouble)fixed.y.fract / (1 << 16)) / em_size;
 325     vertex[2] = 0.0;
 326 }
 327
 328 static void tess_callback_vertex(GLvoid *vertex)
 329 {
 330     GLdouble *dbl = vertex;
 331     TRACE("%f, %f, %f\n", dbl[0], dbl[1], dbl[2]);
 332     glVertex3dv(vertex);
 333 }
 334
 335 static void tess_callback_begin(GLenum which)
 336 {
 337     TRACE("%d\n", which);
 338     glBegin(which);
 339 }
 340
 341 static void tess_callback_end(void)
 342 {
 343     TRACE("\n");
 344     glEnd();
 345 }
 346
 347 /***********************************************************************
 348  *              wglUseFontOutlines_common
 349  */
 350 static BOOL WINAPI wglUseFontOutlines_common(HDC hdc,
 351                                       DWORD first,
 352                                       DWORD count,
 353                                       DWORD listBase,
 354                                       FLOAT deviation,
 355                                       FLOAT extrusion,
 356                                       int format,
 357                                       LPGLYPHMETRICSFLOAT lpgmf,
 358                                       BOOL unicode)
 359 {
 360     UINT glyph;
 361     const MAT2 identity = {{0,1},{0,0},{0,0},{0,1}};
 362     GLUtesselator *tess;
 363     LOGFONTW lf;
 364     HFONT old_font, unscaled_font;
 365     UINT em_size = 1024;
 366     RECT rc;
 367
 368     TRACE("(%p, %d, %d, %d, %f, %f, %d, %p, %s)\n", hdc, first, count,
 369           listBase, deviation, extrusion, format, lpgmf, unicode ? "W" : "A");
 370
 371
 372     ENTER_GL();
 373     tess = gluNewTess();
 374     if(tess)
 375     {
 376         gluTessCallback(tess, GLU_TESS_VERTEX, (_GLUfuncptr)tess_callback_vertex);
 377         gluTessCallback(tess, GLU_TESS_BEGIN, (_GLUfuncptr)tess_callback_begin);
 378         gluTessCallback(tess, GLU_TESS_END, tess_callback_end);
 379     }
 380     LEAVE_GL();
 381
 382     if(!tess) return FALSE;
 383
 384     GetObjectW(GetCurrentObject(hdc, OBJ_FONT), sizeof(lf), &lf);
 385     rc.left = rc.right = rc.bottom = 0;
 386     rc.top = em_size;
 387     DPtoLP(hdc, (POINT*)&rc, 2);
 388     lf.lfHeight = -abs(rc.top - rc.bottom);
 389     lf.lfOrientation = lf.lfEscapement = 0;
 390     unscaled_font = CreateFontIndirectW(&lf);
 391     old_font = SelectObject(hdc, unscaled_font);
 392
 393     for (glyph = first; glyph < first + count; glyph++)
 394     {
 395         DWORD needed;
 396         GLYPHMETRICS gm;
 397         BYTE *buf;
 398         TTPOLYGONHEADER *pph;
 399         TTPOLYCURVE *ppc;
 400         GLdouble *vertices;
 401
 402         if(unicode)
 403             needed = GetGlyphOutlineW(hdc, glyph, GGO_NATIVE, &gm, 0, NULL, &identity);
 404         else
 405             needed = GetGlyphOutlineA(hdc, glyph, GGO_NATIVE, &gm, 0, NULL, &identity);
 406
 407         if(needed == GDI_ERROR)
 408             goto error;
 409
 410         buf = HeapAlloc(GetProcessHeap(), 0, needed);
 411         vertices = HeapAlloc(GetProcessHeap(), 0, needed / sizeof(POINTFX) * 3 * sizeof(GLdouble));
 412
 413         if(unicode)
 414             GetGlyphOutlineW(hdc, glyph, GGO_NATIVE, &gm, needed, buf, &identity);
 415         else
 416             GetGlyphOutlineA(hdc, glyph, GGO_NATIVE, &gm, needed, buf, &identity);
 417
 418         TRACE("glyph %d\n", glyph);
 419
 420         if(lpgmf)
 421         {
 422             lpgmf->gmfBlackBoxX = (float)gm.gmBlackBoxX / em_size;
 423             lpgmf->gmfBlackBoxY = (float)gm.gmBlackBoxY / em_size;
 424             lpgmf->gmfptGlyphOrigin.x = (float)gm.gmptGlyphOrigin.x / em_size;
 425             lpgmf->gmfptGlyphOrigin.y = (float)gm.gmptGlyphOrigin.y / em_size;
 426             lpgmf->gmfCellIncX = (float)gm.gmCellIncX / em_size;
 427             lpgmf->gmfCellIncY = (float)gm.gmCellIncY / em_size;
 428
 429             TRACE("%fx%f at %f,%f inc %f,%f\n", lpgmf->gmfBlackBoxX, lpgmf->gmfBlackBoxY,
 430                   lpgmf->gmfptGlyphOrigin.x, lpgmf->gmfptGlyphOrigin.y, lpgmf->gmfCellIncX, lpgmf->gmfCellIncY);
 431             lpgmf++;
 432         }
 433
 434         ENTER_GL();
 435         glNewList(listBase++, GL_COMPILE);
 436         gluTessBeginPolygon(tess, NULL);
 437
 438         pph = (TTPOLYGONHEADER*)buf;
 439         while((BYTE*)pph < buf + needed)
 440         {
 441             TRACE("\tstart %d, %d\n", pph->pfxStart.x.value, pph->pfxStart.y.value);
 442
 443             gluTessBeginContour(tess);
 444
 445             fixed_to_double(pph->pfxStart, em_size, vertices);
 446             gluTessVertex(tess, vertices, vertices);
 447             vertices += 3;
 448
 449             ppc = (TTPOLYCURVE*)((char*)pph + sizeof(*pph));
 450             while((char*)ppc < (char*)pph + pph->cb)
 451             {
 452                 int i;
 453
 454                 switch(ppc->wType) {
 455                 case TT_PRIM_LINE:
 456                     for(i = 0; i < ppc->cpfx; i++)
 457                     {
 458                         TRACE("\t\tline to %d, %d\n", ppc->apfx[i].x.value, ppc->apfx[i].y.value);
 459                         fixed_to_double(ppc->apfx[i], em_size, vertices);
 460                         gluTessVertex(tess, vertices, vertices);
 461                         vertices += 3;
 462                     }
 463                     break;
 464
 465                 case TT_PRIM_QSPLINE:
 466                     for(i = 0; i < ppc->cpfx/2; i++)
 467                     {
 468                         /* FIXME just connecting the control points for now */
 469                         TRACE("\t\tcurve  %d,%d %d,%d\n",
 470                               ppc->apfx[i * 2].x.value,     ppc->apfx[i * 3].y.value,
 471                               ppc->apfx[i * 2 + 1].x.value, ppc->apfx[i * 3 + 1].y.value);
 472                         fixed_to_double(ppc->apfx[i * 2], em_size, vertices);
 473                         gluTessVertex(tess, vertices, vertices);
 474                         vertices += 3;
 475                         fixed_to_double(ppc->apfx[i * 2 + 1], em_size, vertices);
 476                         gluTessVertex(tess, vertices, vertices);
 477                         vertices += 3;
 478                     }
 479                     break;
 480                 default:
 481                     ERR("\t\tcurve type = %d\n", ppc->wType);
 482                     gluTessEndContour(tess);
 483                     goto error_in_list;
 484                 }
 485
 486                 ppc = (TTPOLYCURVE*)((char*)ppc + sizeof(*ppc) +
 487                                      (ppc->cpfx - 1) * sizeof(POINTFX));
 488             }
 489             gluTessEndContour(tess);
 490             pph = (TTPOLYGONHEADER*)((char*)pph + pph->cb);
 491         }
 492
 493 error_in_list:
 494         gluTessEndPolygon(tess);
 495         glTranslated((GLdouble)gm.gmCellIncX / em_size, (GLdouble)gm.gmCellIncY / em_size, 0.0);
 496         glEndList();
 497         LEAVE_GL();
 498         HeapFree(GetProcessHeap(), 0, buf);
 499         HeapFree(GetProcessHeap(), 0, vertices);
 500     }
 501
 502  error:
 503     DeleteObject(SelectObject(hdc, old_font));
 504     gluDeleteTess(tess);
 505     return TRUE;
 506
 507 }
 508
 509 #else /* HAVE_GL_GLU_H */
 510
 511 static BOOL WINAPI wglUseFontOutlines_common(HDC hdc,
 512                                       DWORD first,
 513                                       DWORD count,
 514                                       DWORD listBase,
 515                                       FLOAT deviation,
 516                                       FLOAT extrusion,
 517                                       int format,
 518                                       LPGLYPHMETRICSFLOAT lpgmf,
 519                                       BOOL unicode)
 520 {
 521     FIXME("Unable to compile in wglUseFontOutlines support without GL/glu.h\n");
 522     return FALSE;
 523 }
 524
 525 #endif /* HAVE_GL_GLU_H */
 526
 527 /***********************************************************************
 528  *              wglUseFontOutlinesA (OPENGL32.@)
 529  */
 530 BOOL WINAPI wglUseFontOutlinesA(HDC hdc,
 531                                 DWORD first,
 532                                 DWORD count,
 533                                 DWORD listBase,
 534                                 FLOAT deviation,
 535                                 FLOAT extrusion,
 536                                 int format,
 537                                 LPGLYPHMETRICSFLOAT lpgmf)
 538 {
 539     return wglUseFontOutlines_common(hdc, first, count, listBase, deviation, extrusion, format, lpgmf, FALSE);
 540 }
 541
 542 /***********************************************************************
 543  *              wglUseFontOutlinesW (OPENGL32.@)
 544  */
 545 BOOL WINAPI wglUseFontOutlinesW(HDC hdc,
 546                                 DWORD first,
 547                                 DWORD count,
 548                                 DWORD listBase,
 549                                 FLOAT deviation,
 550                                 FLOAT extrusion,
 551                                 int format,
 552                                 LPGLYPHMETRICSFLOAT lpgmf)
 553 {
 554     return wglUseFontOutlines_common(hdc, first, count, listBase, deviation, extrusion, format, lpgmf, TRUE);
 555 }
 556
 557 /***********************************************************************
 558  *              glFinish (OPENGL32.@)
 559  */
 560 void WINAPI wine_glFinish( void )
 561 {
 562     TRACE("()\n");
 563     wine_wgl.p_wglFinish();
 564 }
 565
 566 /***********************************************************************
 567  *              glFlush (OPENGL32.@)
 568  */
 569 void WINAPI wine_glFlush( void )
 570 {
 571     TRACE("()\n");
 572     wine_wgl.p_wglFlush();
 573 }
 574
 575 /***********************************************************************
 576  *              glGetString (OPENGL32.@)
 577  */
 578 const GLubyte * WINAPI wine_glGetString( GLenum name )
 579 {
 580   const GLubyte *ret;
 581   const char* GL_Extensions = NULL;
 582
 583   if (GL_EXTENSIONS != name) {
 584     ENTER_GL();
 585     ret = glGetString(name);
 586     LEAVE_GL();
 587     return ret;
 588   }
 589
 590   if (NULL == internal_gl_extensions) {
 591     ENTER_GL();
 592     GL_Extensions = (const char *) glGetString(GL_EXTENSIONS);
 593
 594     if (GL_Extensions)
 595     {
 596       size_t len = strlen(GL_Extensions);
 597       internal_gl_extensions = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, len + 2);
 598
 599       TRACE("GL_EXTENSIONS reported:\n");
 600       while (*GL_Extensions != 0x00) {
 601         const char* Start = GL_Extensions;
 602         char        ThisExtn[256];
 603
 604         while (*GL_Extensions != ' ' && *GL_Extensions != 0x00) {
 605           GL_Extensions++;
 606         }
 607         memcpy(ThisExtn, Start, (GL_Extensions - Start));
 608         ThisExtn[GL_Extensions - Start] = 0;
 609         TRACE("- %s:", ThisExtn);
 610
 611         /* test if supported API is disabled by config */
 612         if (NULL == strstr(internal_gl_disabled_extensions, ThisExtn)) {
 613           strcat(internal_gl_extensions, " ");
 614           strcat(internal_gl_extensions, ThisExtn);
 615           TRACE(" active\n");
 616         } else {
 617           TRACE(" deactived (by config)\n");
 618         }
 619
 620         if (*GL_Extensions == ' ') GL_Extensions++;
 621       }
 622     }
 623     LEAVE_GL();
 624   }
 625   return (const GLubyte *) internal_gl_extensions;
 626 }
 627
 628 /***********************************************************************
 629  *              glGetIntegerv (OPENGL32.@)
 630  */
 631 void WINAPI wine_glGetIntegerv( GLenum pname, GLint* params )
 632 {
 633     wine_wgl.p_wglGetIntegerv(pname, params);
 634 }
 635
 636
 637 /* This is for brain-dead applications that use OpenGL functions before even
 638    creating a rendering context.... */
 639 static BOOL process_attach(void)
 640 {
 641   HMODULE mod_x11, mod_gdi32;
 642   DWORD size = sizeof(internal_gl_disabled_extensions);
 643   HKEY hkey = 0;
 644
 645   GetDesktopWindow();  /* make sure winex11 is loaded (FIXME) */
 646   mod_x11 = GetModuleHandleA( "winex11.drv" );
 647   mod_gdi32 = GetModuleHandleA( "gdi32.dll" );
 648
 649   if (!mod_x11 || !mod_gdi32)
 650   {
 651       ERR("X11DRV or GDI32 not loaded. Cannot create default context.\n");
 652       return FALSE;
 653   }
 654
 655   wine_tsx11_lock_ptr   = (void *)GetProcAddress( mod_x11, "wine_tsx11_lock" );
 656   wine_tsx11_unlock_ptr = (void *)GetProcAddress( mod_x11, "wine_tsx11_unlock" );
 657
 658   wine_wgl.p_wglGetProcAddress = (void *)GetProcAddress(mod_gdi32, "wglGetProcAddress");
 659
 660   /* Interal WGL function */
 661   wine_wgl.p_wglGetIntegerv = (void *)wine_wgl.p_wglGetProcAddress("wglGetIntegerv");
 662   wine_wgl.p_wglFinish = (void *)wine_wgl.p_wglGetProcAddress("wglFinish");
 663   wine_wgl.p_wglFlush = (void *)wine_wgl.p_wglGetProcAddress("wglFlush");
 664
 665   internal_gl_disabled_extensions[0] = 0;
 666   if (!RegOpenKeyA( HKEY_CURRENT_USER, "Software\\Wine\\OpenGL", &hkey)) {
 667     if (!RegQueryValueExA( hkey, "DisabledExtensions", 0, NULL, (LPBYTE)internal_gl_disabled_extensions, &size)) {
 668       TRACE("found DisabledExtensions=\"%s\"\n", internal_gl_disabled_extensions);
 669     }
 670     RegCloseKey(hkey);
 671   }
 672
 673   return TRUE;
 674 }
 675
 676
 677 /**********************************************************************/
 678
 679 static void process_detach(void)
 680 {
 681   HeapFree(GetProcessHeap(), 0, internal_gl_extensions);
 682 }
 683
 684 /***********************************************************************
 685  *           OpenGL initialisation routine
 686  */
 687 BOOL WINAPI DllMain( HINSTANCE hinst, DWORD reason, LPVOID reserved )
 688 {
 689     switch(reason)
 690     {
 691     case DLL_PROCESS_ATTACH:
 692         opengl32_handle = hinst;
 693         DisableThreadLibraryCalls(hinst);
 694         return process_attach();
 695     case DLL_PROCESS_DETACH:
 696         process_detach();
 697         break;
 698     }
 699     return TRUE;
 700 }