src/gallium/state_trackers/glx/xlib/glx_api.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.6
   4  *
   5  * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
   6  * Copyright (C) 2009  VMware, Inc.  All Rights Reserved.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a
   9  * copy of this software and associated documentation files (the "Software"),
  10  * to deal in the Software without restriction, including without limitation
  11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12  * and/or sell copies of the Software, and to permit persons to whom the
  13  * Software is furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included
  16  * in all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  21  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  22  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  23  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26
  27 /**
  28  * "Fake" GLX API implemented in terms of the XMesa*() functions.
  29  */
  30
  31
  32
  33 #define GLX_GLXEXT_PROTOTYPES
  34 #include "GL/glx.h"
  35
  36 #include "xm_api.h"
  37 #include "main/context.h"
  38 #include "main/config.h"
  39 #include "main/macros.h"
  40 #include "main/imports.h"
  41 #include "main/version.h"
  42 #include "state_tracker/st_context.h"
  43 #include "state_tracker/st_public.h"
  44
  45
  46 /* This indicates the client-side GLX API and GLX encoder version. */
  47 #define CLIENT_MAJOR_VERSION 1
  48 #define CLIENT_MINOR_VERSION 4  /* but don't have 1.3's pbuffers, etc yet */
  49
  50 /* This indicates the server-side GLX decoder version.
  51  * GLX 1.4 indicates OpenGL 1.3 support
  52  */
  53 #define SERVER_MAJOR_VERSION 1
  54 #define SERVER_MINOR_VERSION 4
  55
  56 /* This is appended onto the glXGetClient/ServerString version strings. */
  57 #define MESA_GLX_VERSION "Mesa " MESA_VERSION_STRING
  58
  59 /* Who implemented this GLX? */
  60 #define VENDOR "Brian Paul"
  61
  62 #define EXTENSIONS \
  63    "GLX_MESA_copy_sub_buffer " \
  64    "GLX_MESA_pixmap_colormap " \
  65    "GLX_MESA_release_buffers " \
  66    "GLX_ARB_get_proc_address " \
  67    "GLX_EXT_texture_from_pixmap " \
  68    "GLX_EXT_visual_info " \
  69    "GLX_EXT_visual_rating " \
  70    /*"GLX_SGI_video_sync "*/ \
  71    "GLX_SGIX_fbconfig " \
  72    "GLX_SGIX_pbuffer "
  73
  74 #define DEFAULT_DIRECT GL_TRUE
  75
  76
  77
  78 /**
  79  * The GLXContext typedef is defined as a pointer to this structure.
  80  */
  81 struct __GLXcontextRec
  82 {
  83    Display *currentDpy;
  84    GLboolean isDirect;
  85    GLXDrawable currentDrawable;
  86    GLXDrawable currentReadable;
  87    XID xid;
  88
  89    XMesaContext xmesaContext;
  90 };
  91
  92
  93
  94 static pipe_tsd ContextTSD;
  95
  96 /** Set current context for calling thread */
  97 static void
  98 SetCurrentContext(GLXContext c)
  99 {
 100    pipe_tsd_set(&ContextTSD, c);
 101 }
 102
 103 /** Get current context for calling thread */
 104 static GLXContext
 105 GetCurrentContext(void)
 106 {
 107    return pipe_tsd_get(&ContextTSD);
 108 }
 109
 110
 111
 112 /**********************************************************************/
 113 /***                       GLX Visual Code                          ***/
 114 /**********************************************************************/
 115
 116 #define DONT_CARE -1
 117
 118
 119 static XMesaVisual *VisualTable = NULL;
 120 static int NumVisuals = 0;
 121
 122
 123
 124 /* Macro to handle c_class vs class field name in XVisualInfo struct */
 125 #if defined(__cplusplus) || defined(c_plusplus)
 126 #define CLASS c_class
 127 #else
 128 #define CLASS class
 129 #endif
 130
 131
 132
 133 /*
 134  * Test if the given XVisualInfo is usable for Mesa rendering.
 135  */
 136 static GLboolean
 137 is_usable_visual( XVisualInfo *vinfo )
 138 {
 139    switch (vinfo->CLASS) {
 140       case StaticGray:
 141       case GrayScale:
 142          /* Any StaticGray/GrayScale visual works in RGB or CI mode */
 143          return GL_TRUE;
 144       case StaticColor:
 145       case PseudoColor:
 146          /* Any StaticColor/PseudoColor visual of at least 4 bits */
 147          if (vinfo->depth>=4) {
 148             return GL_TRUE;
 149          }
 150          else {
 151             return GL_FALSE;
 152          }
 153       case TrueColor:
 154       case DirectColor:
 155          /* Any depth of TrueColor or DirectColor works in RGB mode */
 156          return GL_TRUE;
 157       default:
 158          /* This should never happen */
 159          return GL_FALSE;
 160    }
 161 }
 162
 163
 164 /*
 165  * Given an XVisualInfo and RGB, Double, and Depth buffer flags, save the
 166  * configuration in our list of GLX visuals.
 167  */
 168 static XMesaVisual
 169 save_glx_visual( Display *dpy, XVisualInfo *vinfo,
 170                  GLboolean rgbFlag, GLboolean alphaFlag, GLboolean dbFlag,
 171                  GLboolean stereoFlag,
 172                  GLint depth_size, GLint stencil_size,
 173                  GLint accumRedSize, GLint accumGreenSize,
 174                  GLint accumBlueSize, GLint accumAlphaSize,
 175                  GLint level, GLint numAuxBuffers )
 176 {
 177    GLboolean ximageFlag = GL_TRUE;
 178    XMesaVisual xmvis;
 179    GLint i;
 180    GLboolean comparePointers;
 181
 182    if (dbFlag) {
 183       /* Check if the MESA_BACK_BUFFER env var is set */
 184       char *backbuffer = _mesa_getenv("MESA_BACK_BUFFER");
 185       if (backbuffer) {
 186          if (backbuffer[0]=='p' || backbuffer[0]=='P') {
 187             ximageFlag = GL_FALSE;
 188          }
 189          else if (backbuffer[0]=='x' || backbuffer[0]=='X') {
 190             ximageFlag = GL_TRUE;
 191          }
 192          else {
 193             _mesa_warning(NULL, "Mesa: invalid value for MESA_BACK_BUFFER environment variable, using an XImage.");
 194          }
 195       }
 196    }
 197
 198    if (stereoFlag) {
 199       /* stereo not supported */
 200       return NULL;
 201    }
 202
 203    if (stencil_size > 0 && depth_size > 0)
 204       depth_size = 24;
 205
 206    /* Comparing IDs uses less memory but sometimes fails. */
 207    /* XXX revisit this after 3.0 is finished. */
 208    if (_mesa_getenv("MESA_GLX_VISUAL_HACK"))
 209       comparePointers = GL_TRUE;
 210    else
 211       comparePointers = GL_FALSE;
 212
 213    /* Force the visual to have an alpha channel */
 214    if (rgbFlag && _mesa_getenv("MESA_GLX_FORCE_ALPHA"))
 215       alphaFlag = GL_TRUE;
 216
 217    /* First check if a matching visual is already in the list */
 218    for (i=0; i<NumVisuals; i++) {
 219       XMesaVisual v = VisualTable[i];
 220       if (v->display == dpy
 221           && v->mesa_visual.level == level
 222           && v->mesa_visual.numAuxBuffers == numAuxBuffers
 223           && v->ximage_flag == ximageFlag
 224           && v->mesa_visual.rgbMode == rgbFlag
 225           && v->mesa_visual.doubleBufferMode == dbFlag
 226           && v->mesa_visual.stereoMode == stereoFlag
 227           && (v->mesa_visual.alphaBits > 0) == alphaFlag
 228           && (v->mesa_visual.depthBits >= depth_size || depth_size == 0)
 229           && (v->mesa_visual.stencilBits >= stencil_size || stencil_size == 0)
 230           && (v->mesa_visual.accumRedBits >= accumRedSize || accumRedSize == 0)
 231           && (v->mesa_visual.accumGreenBits >= accumGreenSize || accumGreenSize == 0)
 232           && (v->mesa_visual.accumBlueBits >= accumBlueSize || accumBlueSize == 0)
 233           && (v->mesa_visual.accumAlphaBits >= accumAlphaSize || accumAlphaSize == 0)) {
 234          /* now either compare XVisualInfo pointers or visual IDs */
 235          if ((!comparePointers && v->visinfo->visualid == vinfo->visualid)
 236              || (comparePointers && v->vishandle == vinfo)) {
 237             return v;
 238          }
 239       }
 240    }
 241
 242    /* Create a new visual and add it to the list. */
 243
 244    xmvis = XMesaCreateVisual( dpy, vinfo, rgbFlag, alphaFlag, dbFlag,
 245                               stereoFlag, ximageFlag,
 246                               depth_size, stencil_size,
 247                               accumRedSize, accumBlueSize,
 248                               accumBlueSize, accumAlphaSize, 0, level,
 249                               GLX_NONE_EXT );
 250    if (xmvis) {
 251       /* Save a copy of the pointer now so we can find this visual again
 252        * if we need to search for it in find_glx_visual().
 253        */
 254       xmvis->vishandle = vinfo;
 255       /* Allocate more space for additional visual */
 256       VisualTable = (XMesaVisual *) _mesa_realloc( VisualTable,
 257                                    sizeof(XMesaVisual) * NumVisuals,
 258                                    sizeof(XMesaVisual) * (NumVisuals + 1));
 259       /* add xmvis to the list */
 260       VisualTable[NumVisuals] = xmvis;
 261       NumVisuals++;
 262       /* XXX minor hack, because XMesaCreateVisual doesn't support an
 263        * aux buffers parameter.
 264        */
 265       xmvis->mesa_visual.numAuxBuffers = numAuxBuffers;
 266    }
 267    return xmvis;
 268 }
 269
 270
 271 /**
 272  * Return the default number of bits for the Z buffer.
 273  * If defined, use the MESA_GLX_DEPTH_BITS env var value.
 274  * Otherwise, use the DEFAULT_SOFTWARE_DEPTH_BITS constant.
 275  * XXX probably do the same thing for stencil, accum, etc.
 276  */
 277 static GLint
 278 default_depth_bits(void)
 279 {
 280    int zBits;
 281    const char *zEnv = _mesa_getenv("MESA_GLX_DEPTH_BITS");
 282    if (zEnv)
 283       zBits = atoi(zEnv);
 284    else
 285       zBits = DEFAULT_SOFTWARE_DEPTH_BITS;
 286    return zBits;
 287 }
 288
 289 static GLint
 290 default_alpha_bits(void)
 291 {
 292    int aBits;
 293    const char *aEnv = _mesa_getenv("MESA_GLX_ALPHA_BITS");
 294    if (aEnv)
 295       aBits = atoi(aEnv);
 296    else
 297       aBits = 0;
 298    return aBits;
 299 }
 300
 301 static GLint
 302 default_accum_bits(void)
 303 {
 304    return 16;
 305 }
 306
 307
 308
 309 /*
 310  * Create a GLX visual from a regular XVisualInfo.
 311  * This is called when Fake GLX is given an XVisualInfo which wasn't
 312  * returned by glXChooseVisual.  Since this is the first time we're
 313  * considering this visual we'll take a guess at reasonable values
 314  * for depth buffer size, stencil size, accum size, etc.
 315  * This is the best we can do with a client-side emulation of GLX.
 316  */
 317 static XMesaVisual
 318 create_glx_visual( Display *dpy, XVisualInfo *visinfo )
 319 {
 320    GLint zBits = default_depth_bits();
 321    GLint accBits = default_accum_bits();
 322    GLboolean alphaFlag = default_alpha_bits() > 0;
 323
 324    if (is_usable_visual( visinfo )) {
 325       /* Configure this visual as RGB, double-buffered, depth-buffered. */
 326       /* This is surely wrong for some people's needs but what else */
 327       /* can be done?  They should use glXChooseVisual(). */
 328       return save_glx_visual( dpy, visinfo,
 329                               GL_TRUE,   /* rgb */
 330                               alphaFlag, /* alpha */
 331                               GL_TRUE,   /* double */
 332                               GL_FALSE,  /* stereo */
 333                               zBits,
 334                               STENCIL_BITS,
 335                               accBits, /* r */
 336                               accBits, /* g */
 337                               accBits, /* b */
 338                               accBits, /* a */
 339                               0,         /* level */
 340                               0          /* numAux */
 341          );
 342    }
 343    else {
 344       _mesa_warning(NULL, "Mesa: error in glXCreateContext: bad visual\n");
 345       return NULL;
 346    }
 347 }
 348
 349
 350
 351 /*
 352  * Find the GLX visual associated with an XVisualInfo.
 353  */
 354 static XMesaVisual
 355 find_glx_visual( Display *dpy, XVisualInfo *vinfo )
 356 {
 357    int i;
 358
 359    /* try to match visual id */
 360    for (i=0;i<NumVisuals;i++) {
 361       if (VisualTable[i]->display==dpy
 362           && VisualTable[i]->visinfo->visualid == vinfo->visualid) {
 363          return VisualTable[i];
 364       }
 365    }
 366
 367    /* if that fails, try to match pointers */
 368    for (i=0;i<NumVisuals;i++) {
 369       if (VisualTable[i]->display==dpy && VisualTable[i]->vishandle==vinfo) {
 370          return VisualTable[i];
 371       }
 372    }
 373
 374    return NULL;
 375 }
 376
 377
 378 /**
 379  * Try to get an X visual which matches the given arguments.
 380  */
 381 static XVisualInfo *
 382 get_visual( Display *dpy, int scr, unsigned int depth, int xclass )
 383 {
 384    XVisualInfo temp, *vis;
 385    long mask;
 386    int n;
 387    unsigned int default_depth;
 388    int default_class;
 389
 390    mask = VisualScreenMask | VisualDepthMask | VisualClassMask;
 391    temp.screen = scr;
 392    temp.depth = depth;
 393    temp.CLASS = xclass;
 394
 395    default_depth = DefaultDepth(dpy,scr);
 396    default_class = DefaultVisual(dpy,scr)->CLASS;
 397
 398    if (depth==default_depth && xclass==default_class) {
 399       /* try to get root window's visual */
 400       temp.visualid = DefaultVisual(dpy,scr)->visualid;
 401       mask |= VisualIDMask;
 402    }
 403
 404    vis = XGetVisualInfo( dpy, mask, &temp, &n );
 405
 406    /* In case bits/pixel > 24, make sure color channels are still <=8 bits.
 407     * An SGI Infinite Reality system, for example, can have 30bpp pixels:
 408     * 10 bits per color channel.  Mesa's limited to a max of 8 bits/channel.
 409     */
 410    if (vis && depth > 24 && (xclass==TrueColor || xclass==DirectColor)) {
 411       if (_mesa_bitcount((GLuint) vis->red_mask  ) <= 8 &&
 412           _mesa_bitcount((GLuint) vis->green_mask) <= 8 &&
 413           _mesa_bitcount((GLuint) vis->blue_mask ) <= 8) {
 414          return vis;
 415       }
 416       else {
 417          XFree((void *) vis);
 418          return NULL;
 419       }
 420    }
 421
 422    return vis;
 423 }
 424
 425
 426 /*
 427  * Retrieve the value of the given environment variable and find
 428  * the X visual which matches it.
 429  * Input:  dpy - the display
 430  *         screen - the screen number
 431  *         varname - the name of the environment variable
 432  * Return:  an XVisualInfo pointer to NULL if error.
 433  */
 434 static XVisualInfo *
 435 get_env_visual(Display *dpy, int scr, const char *varname)
 436 {
 437    char value[100], type[100];
 438    int depth, xclass = -1;
 439    XVisualInfo *vis;
 440
 441    if (!_mesa_getenv( varname )) {
 442       return NULL;
 443    }
 444
 445    strncpy( value, _mesa_getenv(varname), 100 );
 446    value[99] = 0;
 447
 448    sscanf( value, "%s %d", type, &depth );
 449
 450    if (strcmp(type,"TrueColor")==0)          xclass = TrueColor;
 451    else if (strcmp(type,"DirectColor")==0)   xclass = DirectColor;
 452    else if (strcmp(type,"PseudoColor")==0)   xclass = PseudoColor;
 453    else if (strcmp(type,"StaticColor")==0)   xclass = StaticColor;
 454    else if (strcmp(type,"GrayScale")==0)     xclass = GrayScale;
 455    else if (strcmp(type,"StaticGray")==0)    xclass = StaticGray;
 456
 457    if (xclass>-1 && depth>0) {
 458       vis = get_visual( dpy, scr, depth, xclass );
 459       if (vis) {
 460          return vis;
 461       }
 462    }
 463
 464    _mesa_warning(NULL, "GLX unable to find visual class=%s, depth=%d.",
 465                  type, depth);
 466
 467    return NULL;
 468 }
 469
 470
 471
 472 /*
 473  * Select an X visual which satisfies the RGBA flag and minimum depth.
 474  * Input:  dpy,
 475  *         screen - X display and screen number
 476  *         min_depth - minimum visual depth
 477  *         preferred_class - preferred GLX visual class or DONT_CARE
 478  * Return:  pointer to an XVisualInfo or NULL.
 479  */
 480 static XVisualInfo *
 481 choose_x_visual( Display *dpy, int screen, int min_depth,
 482                  int preferred_class )
 483 {
 484    XVisualInfo *vis;
 485    int xclass, visclass = 0;
 486    int depth;
 487
 488    /* First see if the MESA_RGB_VISUAL env var is defined */
 489    vis = get_env_visual( dpy, screen, "MESA_RGB_VISUAL" );
 490    if (vis) {
 491       return vis;
 492    }
 493    /* Otherwise, search for a suitable visual */
 494    if (preferred_class==DONT_CARE) {
 495       for (xclass=0;xclass<6;xclass++) {
 496          switch (xclass) {
 497          case 0:  visclass = TrueColor;    break;
 498          case 1:  visclass = DirectColor;  break;
 499          case 2:  visclass = PseudoColor;  break;
 500          case 3:  visclass = StaticColor;  break;
 501          case 4:  visclass = GrayScale;    break;
 502          case 5:  visclass = StaticGray;   break;
 503          }
 504          if (min_depth==0) {
 505             /* start with shallowest */
 506             for (depth=0;depth<=32;depth++) {
 507                if (visclass==TrueColor && depth==8) {
 508                   /* Special case:  try to get 8-bit PseudoColor before */
 509                   /* 8-bit TrueColor */
 510                   vis = get_visual( dpy, screen, 8, PseudoColor );
 511                   if (vis) {
 512                      return vis;
 513                   }
 514                }
 515                vis = get_visual( dpy, screen, depth, visclass );
 516                if (vis) {
 517                   return vis;
 518                }
 519             }
 520          }
 521          else {
 522             /* start with deepest */
 523             for (depth=32;depth>=min_depth;depth--) {
 524                if (visclass==TrueColor && depth==8) {
 525                   /* Special case:  try to get 8-bit PseudoColor before */
 526                   /* 8-bit TrueColor */
 527                   vis = get_visual( dpy, screen, 8, PseudoColor );
 528                   if (vis) {
 529                      return vis;
 530                   }
 531                }
 532                vis = get_visual( dpy, screen, depth, visclass );
 533                if (vis) {
 534                   return vis;
 535                }
 536             }
 537          }
 538       }
 539    }
 540    else {
 541       /* search for a specific visual class */
 542       switch (preferred_class) {
 543       case GLX_TRUE_COLOR_EXT:    visclass = TrueColor;    break;
 544       case GLX_DIRECT_COLOR_EXT:  visclass = DirectColor;  break;
 545       case GLX_PSEUDO_COLOR_EXT:  visclass = PseudoColor;  break;
 546       case GLX_STATIC_COLOR_EXT:  visclass = StaticColor;  break;
 547       case GLX_GRAY_SCALE_EXT:    visclass = GrayScale;    break;
 548       case GLX_STATIC_GRAY_EXT:   visclass = StaticGray;   break;
 549       default:   return NULL;
 550       }
 551       if (min_depth==0) {
 552          /* start with shallowest */
 553          for (depth=0;depth<=32;depth++) {
 554             vis = get_visual( dpy, screen, depth, visclass );
 555             if (vis) {
 556                return vis;
 557             }
 558          }
 559       }
 560       else {
 561          /* start with deepest */
 562          for (depth=32;depth>=min_depth;depth--) {
 563             vis = get_visual( dpy, screen, depth, visclass );
 564             if (vis) {
 565                return vis;
 566             }
 567          }
 568       }
 569    }
 570
 571    /* didn't find a visual */
 572    return NULL;
 573 }
 574
 575
 576
 577
 578 /**********************************************************************/
 579 /***             Display-related functions                          ***/
 580 /**********************************************************************/
 581
 582
 583 /**
 584  * Free all XMesaVisuals which are associated with the given display.
 585  */
 586 static void
 587 destroy_visuals_on_display(Display *dpy)
 588 {
 589    int i;
 590    for (i = 0; i < NumVisuals; i++) {
 591       if (VisualTable[i]->display == dpy) {
 592          /* remove this visual */
 593          int j;
 594          free(VisualTable[i]);
 595          for (j = i; j < NumVisuals - 1; j++)
 596             VisualTable[j] = VisualTable[j + 1];
 597          NumVisuals--;
 598       }
 599    }
 600 }
 601
 602
 603 /**
 604  * Called from XCloseDisplay() to let us free our display-related data.
 605  */
 606 static int
 607 close_display_callback(Display *dpy, XExtCodes *codes)
 608 {
 609    destroy_visuals_on_display(dpy);
 610    xmesa_destroy_buffers_on_display(dpy);
 611    return 0;
 612 }
 613
 614
 615 /**
 616  * Look for the named extension on given display and return a pointer
 617  * to the _XExtension data, or NULL if extension not found.
 618  */
 619 static _XExtension *
 620 lookup_extension(Display *dpy, const char *extName)
 621 {
 622    _XExtension *ext;
 623    for (ext = dpy->ext_procs; ext; ext = ext->next) {
 624       if (ext->name && strcmp(ext->name, extName) == 0) {
 625          return ext;
 626       }
 627    }
 628    return NULL;
 629 }
 630
 631
 632 /**
 633  * Whenever we're given a new Display pointer, call this function to
 634  * register our close_display_callback function.
 635  */
 636 static void
 637 register_with_display(Display *dpy)
 638 {
 639    const char *extName = "MesaGLX";
 640    _XExtension *ext;
 641
 642    ext = lookup_extension(dpy, extName);
 643    if (!ext) {
 644       XExtCodes *c = XAddExtension(dpy);
 645       ext = dpy->ext_procs;  /* new extension is at head of list */
 646       assert(c->extension == ext->codes.extension);
 647       (void) c;
 648       ext->name = _mesa_strdup(extName);
 649       ext->close_display = close_display_callback;
 650    }
 651 }
 652
 653
 654 /**********************************************************************/
 655 /***                  Begin Fake GLX API Functions                  ***/
 656 /**********************************************************************/
 657
 658
 659 /**
 660  * Helper used by glXChooseVisual and glXChooseFBConfig.
 661  * The fbConfig parameter must be GL_FALSE for the former and GL_TRUE for
 662  * the later.
 663  * In either case, the attribute list is terminated with the value 'None'.
 664  */
 665 static XMesaVisual
 666 choose_visual( Display *dpy, int screen, const int *list, GLboolean fbConfig )
 667 {
 668    const GLboolean rgbModeDefault = fbConfig;
 669    const int *parselist;
 670    XVisualInfo *vis;
 671    int min_ci = 0;
 672    int min_red=0, min_green=0, min_blue=0;
 673    GLboolean rgb_flag = rgbModeDefault;
 674    GLboolean alpha_flag = GL_FALSE;
 675    GLboolean double_flag = GL_FALSE;
 676    GLboolean stereo_flag = GL_FALSE;
 677    GLint depth_size = 0;
 678    GLint stencil_size = 0;
 679    GLint accumRedSize = 0;
 680    GLint accumGreenSize = 0;
 681    GLint accumBlueSize = 0;
 682    GLint accumAlphaSize = 0;
 683    int level = 0;
 684    int visual_type = DONT_CARE;
 685    int trans_type = DONT_CARE;
 686    int trans_value = DONT_CARE;
 687    GLint caveat = DONT_CARE;
 688    XMesaVisual xmvis = NULL;
 689    int desiredVisualID = -1;
 690    int numAux = 0;
 691
 692    parselist = list;
 693
 694    while (*parselist) {
 695
 696       switch (*parselist) {
 697          case GLX_USE_GL:
 698             if (fbConfig) {
 699                /* invalid token */
 700                return NULL;
 701             }
 702             else {
 703                /* skip */
 704                parselist++;
 705             }
 706             break;
 707          case GLX_BUFFER_SIZE:
 708             parselist++;
 709             min_ci = *parselist++;
 710             break;
 711          case GLX_LEVEL:
 712             parselist++;
 713             level = *parselist++;
 714             break;
 715          case GLX_RGBA:
 716             if (fbConfig) {
 717                /* invalid token */
 718                return NULL;
 719             }
 720             else {
 721                rgb_flag = GL_TRUE;
 722                parselist++;
 723             }
 724             break;
 725          case GLX_DOUBLEBUFFER:
 726             parselist++;
 727             if (fbConfig) {
 728                double_flag = *parselist++;
 729             }
 730             else {
 731                double_flag = GL_TRUE;
 732             }
 733             break;
 734          case GLX_STEREO:
 735             parselist++;
 736             if (fbConfig) {
 737                stereo_flag = *parselist++;
 738             }
 739             else {
 740                stereo_flag = GL_TRUE;
 741             }
 742             break;
 743          case GLX_AUX_BUFFERS:
 744             parselist++;
 745             numAux = *parselist++;
 746             if (numAux > MAX_AUX_BUFFERS)
 747                return NULL;
 748             break;
 749          case GLX_RED_SIZE:
 750             parselist++;
 751             min_red = *parselist++;
 752             break;
 753          case GLX_GREEN_SIZE:
 754             parselist++;
 755             min_green = *parselist++;
 756             break;
 757          case GLX_BLUE_SIZE:
 758             parselist++;
 759             min_blue = *parselist++;
 760             break;
 761          case GLX_ALPHA_SIZE:
 762             parselist++;
 763             {
 764                GLint size = *parselist++;
 765                alpha_flag = size ? GL_TRUE : GL_FALSE;
 766             }
 767             break;
 768          case GLX_DEPTH_SIZE:
 769             parselist++;
 770             depth_size = *parselist++;
 771             break;
 772          case GLX_STENCIL_SIZE:
 773             parselist++;
 774             stencil_size = *parselist++;
 775             break;
 776          case GLX_ACCUM_RED_SIZE:
 777             parselist++;
 778             {
 779                GLint size = *parselist++;
 780                accumRedSize = MAX2( accumRedSize, size );
 781             }
 782             break;
 783          case GLX_ACCUM_GREEN_SIZE:
 784             parselist++;
 785             {
 786                GLint size = *parselist++;
 787                accumGreenSize = MAX2( accumGreenSize, size );
 788             }
 789             break;
 790          case GLX_ACCUM_BLUE_SIZE:
 791             parselist++;
 792             {
 793                GLint size = *parselist++;
 794                accumBlueSize = MAX2( accumBlueSize, size );
 795             }
 796             break;
 797          case GLX_ACCUM_ALPHA_SIZE:
 798             parselist++;
 799             {
 800                GLint size = *parselist++;
 801                accumAlphaSize = MAX2( accumAlphaSize, size );
 802             }
 803             break;
 804
 805          /*
 806           * GLX_EXT_visual_info extension
 807           */
 808          case GLX_X_VISUAL_TYPE_EXT:
 809             parselist++;
 810             visual_type = *parselist++;
 811             break;
 812          case GLX_TRANSPARENT_TYPE_EXT:
 813             parselist++;
 814             trans_type = *parselist++;
 815             break;
 816          case GLX_TRANSPARENT_INDEX_VALUE_EXT:
 817             parselist++;
 818             trans_value = *parselist++;
 819             break;
 820          case GLX_TRANSPARENT_RED_VALUE_EXT:
 821          case GLX_TRANSPARENT_GREEN_VALUE_EXT:
 822          case GLX_TRANSPARENT_BLUE_VALUE_EXT:
 823          case GLX_TRANSPARENT_ALPHA_VALUE_EXT:
 824             /* ignore */
 825             parselist++;
 826             parselist++;
 827             break;
 828
 829          /*
 830           * GLX_EXT_visual_info extension
 831           */
 832          case GLX_VISUAL_CAVEAT_EXT:
 833             parselist++;
 834             caveat = *parselist++; /* ignored for now */
 835             break;
 836
 837          /*
 838           * GLX_ARB_multisample
 839           */
 840          case GLX_SAMPLE_BUFFERS_ARB:
 841             /* ms not supported */
 842             return NULL;
 843          case GLX_SAMPLES_ARB:
 844             /* ms not supported */
 845             return NULL;
 846
 847          /*
 848           * FBConfig attribs.
 849           */
 850          case GLX_RENDER_TYPE:
 851             if (!fbConfig)
 852                return NULL;
 853             parselist++;
 854             if (*parselist & GLX_RGBA_BIT) {
 855                rgb_flag = GL_TRUE;
 856             }
 857             else if (*parselist & GLX_COLOR_INDEX_BIT) {
 858                rgb_flag = GL_FALSE;
 859             }
 860             else if (*parselist == 0) {
 861                rgb_flag = GL_TRUE;
 862             }
 863             parselist++;
 864             break;
 865          case GLX_DRAWABLE_TYPE:
 866             if (!fbConfig)
 867                return NULL;
 868             parselist++;
 869             if (*parselist & ~(GLX_WINDOW_BIT | GLX_PIXMAP_BIT | GLX_PBUFFER_BIT)) {
 870                return NULL; /* bad bit */
 871             }
 872             parselist++;
 873             break;
 874          case GLX_FBCONFIG_ID:
 875             if (!fbConfig)
 876                return NULL;
 877             parselist++;
 878             desiredVisualID = *parselist++;
 879             break;
 880          case GLX_X_RENDERABLE:
 881             if (!fbConfig)
 882                return NULL;
 883             parselist += 2;
 884             /* ignore */
 885             break;
 886
 887 #ifdef GLX_EXT_texture_from_pixmap
 888          case GLX_BIND_TO_TEXTURE_RGB_EXT:
 889             parselist++; /*skip*/
 890             break;
 891          case GLX_BIND_TO_TEXTURE_RGBA_EXT:
 892             parselist++; /*skip*/
 893             break;
 894          case GLX_BIND_TO_MIPMAP_TEXTURE_EXT:
 895             parselist++; /*skip*/
 896             break;
 897          case GLX_BIND_TO_TEXTURE_TARGETS_EXT:
 898             parselist++;
 899             if (*parselist & ~(GLX_TEXTURE_1D_BIT_EXT |
 900                                GLX_TEXTURE_2D_BIT_EXT |
 901                                GLX_TEXTURE_RECTANGLE_BIT_EXT)) {
 902                /* invalid bit */
 903                return NULL;
 904             }
 905             break;
 906          case GLX_Y_INVERTED_EXT:
 907             parselist++; /*skip*/
 908             break;
 909 #endif
 910
 911          case None:
 912             /* end of list */
 913             break;
 914
 915          default:
 916             /* undefined attribute */
 917             _mesa_warning(NULL, "unexpected attrib 0x%x in choose_visual()",
 918                           *parselist);
 919             return NULL;
 920       }
 921    }
 922
 923    (void) caveat;
 924
 925
 926    /*
 927     * Since we're only simulating the GLX extension this function will never
 928     * find any real GL visuals.  Instead, all we can do is try to find an RGB
 929     * or CI visual of appropriate depth.  Other requested attributes such as
 930     * double buffering, depth buffer, etc. will be associated with the X
 931     * visual and stored in the VisualTable[].
 932     */
 933    if (desiredVisualID != -1) {
 934       /* try to get a specific visual, by visualID */
 935       XVisualInfo temp;
 936       int n;
 937       temp.visualid = desiredVisualID;
 938       temp.screen = screen;
 939       vis = XGetVisualInfo(dpy, VisualIDMask | VisualScreenMask, &temp, &n);
 940       if (vis) {
 941          /* give the visual some useful GLX attributes */
 942          double_flag = GL_TRUE;
 943          rgb_flag = GL_TRUE;
 944          depth_size = default_depth_bits();
 945          stencil_size = STENCIL_BITS;
 946          /* XXX accum??? */
 947       }
 948    }
 949    else if (level==0) {
 950       /* normal color planes */
 951       /* Get an RGB visual */
 952       int min_rgb = min_red + min_green + min_blue;
 953       if (min_rgb>1 && min_rgb<8) {
 954          /* a special case to be sure we can get a monochrome visual */
 955          min_rgb = 1;
 956       }
 957       vis = choose_x_visual( dpy, screen, min_rgb, visual_type );
 958    }
 959    else {
 960       _mesa_warning(NULL, "overlay not supported");
 961       return NULL;
 962    }
 963
 964    if (vis) {
 965       /* Note: we're not exactly obeying the glXChooseVisual rules here.
 966        * When GLX_DEPTH_SIZE = 1 is specified we're supposed to choose the
 967        * largest depth buffer size, which is 32bits/value.  Instead, we
 968        * return 16 to maintain performance with earlier versions of Mesa.
 969        */
 970       if (stencil_size > 0)
 971          depth_size = 24;  /* if Z and stencil, always use 24+8 format */
 972       else if (depth_size > 24)
 973          depth_size = 32;
 974       else if (depth_size > 16)
 975          depth_size = 24;
 976       else if (depth_size > 0) {
 977          depth_size = default_depth_bits();
 978       }
 979
 980       if (!alpha_flag) {
 981          alpha_flag = default_alpha_bits() > 0;
 982       }
 983
 984       /* we only support one size of stencil and accum buffers. */
 985       if (stencil_size > 0)
 986          stencil_size = STENCIL_BITS;
 987
 988       if (accumRedSize > 0 ||
 989           accumGreenSize > 0 ||
 990           accumBlueSize > 0 ||
 991           accumAlphaSize > 0) {
 992
 993          accumRedSize =
 994             accumGreenSize =
 995             accumBlueSize = default_accum_bits();
 996
 997          accumAlphaSize = alpha_flag ? accumRedSize : 0;
 998       }
 999
1000       xmvis = save_glx_visual( dpy, vis, rgb_flag, alpha_flag, double_flag,
1001                                stereo_flag, depth_size, stencil_size,
1002                                accumRedSize, accumGreenSize,
1003                                accumBlueSize, accumAlphaSize, level, numAux );
1004    }
1005
1006    return xmvis;
1007 }
1008
1009
1010 PUBLIC XVisualInfo *
1011 glXChooseVisual( Display *dpy, int screen, int *list )
1012 {
1013    XMesaVisual xmvis;
1014
1015    /* register ourselves as an extension on this display */
1016    register_with_display(dpy);
1017
1018    xmvis = choose_visual(dpy, screen, list, GL_FALSE);
1019    if (xmvis) {
1020       /* create a new vishandle - the cached one may be stale */
1021       xmvis->vishandle = (XVisualInfo *) malloc(sizeof(XVisualInfo));
1022       if (xmvis->vishandle) {
1023          memcpy(xmvis->vishandle, xmvis->visinfo, sizeof(XVisualInfo));
1024       }
1025       return xmvis->vishandle;
1026    }
1027    else
1028       return NULL;
1029 }
1030
1031
1032 PUBLIC GLXContext
1033 glXCreateContext( Display *dpy, XVisualInfo *visinfo,
1034                   GLXContext share_list, Bool direct )
1035 {
1036    XMesaVisual xmvis;
1037    GLXContext glxCtx;
1038    GLXContext shareCtx = share_list;
1039
1040    if (!dpy || !visinfo)
1041       return 0;
1042
1043    glxCtx = CALLOC_STRUCT(__GLXcontextRec);
1044    if (!glxCtx)
1045       return 0;
1046
1047    /* deallocate unused windows/buffers */
1048 #if 0
1049    XMesaGarbageCollect();
1050 #endif
1051
1052    xmvis = find_glx_visual( dpy, visinfo );
1053    if (!xmvis) {
1054       /* This visual wasn't found with glXChooseVisual() */
1055       xmvis = create_glx_visual( dpy, visinfo );
1056       if (!xmvis) {
1057          /* unusable visual */
1058          free(glxCtx);
1059          return NULL;
1060       }
1061    }
1062
1063    glxCtx->xmesaContext = XMesaCreateContext(xmvis,
1064                                    shareCtx ? shareCtx->xmesaContext : NULL);
1065    if (!glxCtx->xmesaContext) {
1066       free(glxCtx);
1067       return NULL;
1068    }
1069
1070    glxCtx->isDirect = DEFAULT_DIRECT;
1071    glxCtx->currentDpy = dpy;
1072    glxCtx->xid = (XID) glxCtx;  /* self pointer */
1073
1074    return glxCtx;
1075 }
1076
1077
1078 /* XXX these may have to be removed due to thread-safety issues. */
1079 static GLXContext MakeCurrent_PrevContext = 0;
1080 static GLXDrawable MakeCurrent_PrevDrawable = 0;
1081 static GLXDrawable MakeCurrent_PrevReadable = 0;
1082 static XMesaBuffer MakeCurrent_PrevDrawBuffer = 0;
1083 static XMesaBuffer MakeCurrent_PrevReadBuffer = 0;
1084
1085
1086 /* GLX 1.3 and later */
1087 PUBLIC Bool
1088 glXMakeContextCurrent( Display *dpy, GLXDrawable draw,
1089                        GLXDrawable read, GLXContext ctx )
1090 {
1091    GLXContext glxCtx = ctx;
1092    static boolean firsttime = 1, no_rast = 0;
1093
1094    if (firsttime) {
1095       no_rast = getenv("SP_NO_RAST") != NULL;
1096       firsttime = 0;
1097    }
1098
1099    if (ctx && draw && read) {
1100       XMesaBuffer drawBuffer, readBuffer;
1101       XMesaContext xmctx = glxCtx->xmesaContext;
1102
1103       /* Find the XMesaBuffer which corresponds to the GLXDrawable 'draw' */
1104       if (ctx == MakeCurrent_PrevContext
1105           && draw == MakeCurrent_PrevDrawable) {
1106          drawBuffer = MakeCurrent_PrevDrawBuffer;
1107       }
1108       else {
1109          drawBuffer = XMesaFindBuffer( dpy, draw );
1110       }
1111       if (!drawBuffer) {
1112          /* drawable must be a new window! */
1113          drawBuffer = XMesaCreateWindowBuffer( xmctx->xm_visual, draw );
1114          if (!drawBuffer) {
1115             /* Out of memory, or context/drawable depth mismatch */
1116             return False;
1117          }
1118       }
1119
1120       /* Find the XMesaBuffer which corresponds to the GLXDrawable 'read' */
1121       if (ctx == MakeCurrent_PrevContext
1122           && read == MakeCurrent_PrevReadable) {
1123          readBuffer = MakeCurrent_PrevReadBuffer;
1124       }
1125       else {
1126          readBuffer = XMesaFindBuffer( dpy, read );
1127       }
1128       if (!readBuffer) {
1129          /* drawable must be a new window! */
1130          readBuffer = XMesaCreateWindowBuffer( xmctx->xm_visual, read );
1131          if (!readBuffer) {
1132             /* Out of memory, or context/drawable depth mismatch */
1133             return False;
1134          }
1135       }
1136
1137       if (no_rast &&
1138           MakeCurrent_PrevContext == ctx &&
1139           MakeCurrent_PrevDrawable == draw &&
1140           MakeCurrent_PrevReadable == read &&
1141           MakeCurrent_PrevDrawBuffer == drawBuffer &&
1142           MakeCurrent_PrevReadBuffer == readBuffer)
1143          return True;
1144
1145       MakeCurrent_PrevContext = ctx;
1146       MakeCurrent_PrevDrawable = draw;
1147       MakeCurrent_PrevReadable = read;
1148       MakeCurrent_PrevDrawBuffer = drawBuffer;
1149       MakeCurrent_PrevReadBuffer = readBuffer;
1150
1151       /* Now make current! */
1152       if (XMesaMakeCurrent2(xmctx, drawBuffer, readBuffer)) {
1153          ctx->currentDpy = dpy;
1154          ctx->currentDrawable = draw;
1155          ctx->currentReadable = read;
1156          SetCurrentContext(ctx);
1157          return True;
1158       }
1159       else {
1160          return False;
1161       }
1162    }
1163    else if (!ctx && !draw && !read) {
1164       /* release current context w/out assigning new one. */
1165       XMesaMakeCurrent2( NULL, NULL, NULL );
1166       MakeCurrent_PrevContext = 0;
1167       MakeCurrent_PrevDrawable = 0;
1168       MakeCurrent_PrevReadable = 0;
1169       MakeCurrent_PrevDrawBuffer = 0;
1170       MakeCurrent_PrevReadBuffer = 0;
1171       SetCurrentContext(NULL);
1172       return True;
1173    }
1174    else {
1175       /* The args must either all be non-zero or all zero.
1176        * This is an error.
1177        */
1178       return False;
1179    }
1180 }
1181
1182
1183 PUBLIC Bool
1184 glXMakeCurrent( Display *dpy, GLXDrawable drawable, GLXContext ctx )
1185 {
1186    return glXMakeContextCurrent( dpy, drawable, drawable, ctx );
1187 }
1188
1189
1190 PUBLIC GLXContext
1191 glXGetCurrentContext(void)
1192 {
1193    return GetCurrentContext();
1194 }
1195
1196
1197 PUBLIC Display *
1198 glXGetCurrentDisplay(void)
1199 {
1200    GLXContext glxCtx = glXGetCurrentContext();
1201
1202    return glxCtx ? glxCtx->currentDpy : NULL;
1203 }
1204
1205
1206 PUBLIC Display *
1207 glXGetCurrentDisplayEXT(void)
1208 {
1209    return glXGetCurrentDisplay();
1210 }
1211
1212
1213 PUBLIC GLXDrawable
1214 glXGetCurrentDrawable(void)
1215 {
1216    GLXContext gc = glXGetCurrentContext();
1217    return gc ? gc->currentDrawable : 0;
1218 }
1219
1220
1221 PUBLIC GLXDrawable
1222 glXGetCurrentReadDrawable(void)
1223 {
1224    GLXContext gc = glXGetCurrentContext();
1225    return gc ? gc->currentReadable : 0;
1226 }
1227
1228
1229 PUBLIC GLXDrawable
1230 glXGetCurrentReadDrawableSGI(void)
1231 {
1232    return glXGetCurrentReadDrawable();
1233 }
1234
1235
1236 PUBLIC GLXPixmap
1237 glXCreateGLXPixmap( Display *dpy, XVisualInfo *visinfo, Pixmap pixmap )
1238 {
1239    XMesaVisual v;
1240    XMesaBuffer b;
1241
1242    v = find_glx_visual( dpy, visinfo );
1243    if (!v) {
1244       v = create_glx_visual( dpy, visinfo );
1245       if (!v) {
1246          /* unusable visual */
1247          return 0;
1248       }
1249    }
1250
1251    b = XMesaCreatePixmapBuffer( v, pixmap, 0 );
1252    if (!b) {
1253       return 0;
1254    }
1255    return b->drawable;
1256 }
1257
1258
1259 /*** GLX_MESA_pixmap_colormap ***/
1260
1261 PUBLIC GLXPixmap
1262 glXCreateGLXPixmapMESA( Display *dpy, XVisualInfo *visinfo,
1263                         Pixmap pixmap, Colormap cmap )
1264 {
1265    XMesaVisual v;
1266    XMesaBuffer b;
1267
1268    v = find_glx_visual( dpy, visinfo );
1269    if (!v) {
1270       v = create_glx_visual( dpy, visinfo );
1271       if (!v) {
1272          /* unusable visual */
1273          return 0;
1274       }
1275    }
1276
1277    b = XMesaCreatePixmapBuffer( v, pixmap, cmap );
1278    if (!b) {
1279       return 0;
1280    }
1281    return b->drawable;
1282 }
1283
1284
1285 PUBLIC void
1286 glXDestroyGLXPixmap( Display *dpy, GLXPixmap pixmap )
1287 {
1288    XMesaBuffer b = XMesaFindBuffer(dpy, pixmap);
1289    if (b) {
1290       XMesaDestroyBuffer(b);
1291    }
1292    else if (_mesa_getenv("MESA_DEBUG")) {
1293       _mesa_warning(NULL, "Mesa: glXDestroyGLXPixmap: invalid pixmap\n");
1294    }
1295 }
1296
1297
1298 PUBLIC void
1299 glXCopyContext( Display *dpy, GLXContext src, GLXContext dst,
1300                 unsigned long mask )
1301 {
1302    XMesaContext xm_src = src->xmesaContext;
1303    XMesaContext xm_dst = dst->xmesaContext;
1304    (void) dpy;
1305    if (MakeCurrent_PrevContext == src) {
1306       _mesa_Flush();
1307    }
1308    st_copy_context_state( xm_src->st, xm_dst->st, (GLuint) mask );
1309 }
1310
1311
1312 PUBLIC Bool
1313 glXQueryExtension( Display *dpy, int *errorBase, int *eventBase )
1314 {
1315    int op, ev, err;
1316    /* Mesa's GLX isn't really an X extension but we try to act like one. */
1317    if (!XQueryExtension(dpy, GLX_EXTENSION_NAME, &op, &ev, &err))
1318       ev = err = 0;
1319    if (errorBase)
1320       *errorBase = err;
1321    if (eventBase)
1322       *eventBase = ev;
1323    return True; /* we're faking GLX so always return success */
1324 }
1325
1326
1327 PUBLIC void
1328 glXDestroyContext( Display *dpy, GLXContext ctx )
1329 {
1330    GLXContext glxCtx = ctx;
1331    (void) dpy;
1332    MakeCurrent_PrevContext = 0;
1333    MakeCurrent_PrevDrawable = 0;
1334    MakeCurrent_PrevReadable = 0;
1335    MakeCurrent_PrevDrawBuffer = 0;
1336    MakeCurrent_PrevReadBuffer = 0;
1337    XMesaDestroyContext( glxCtx->xmesaContext );
1338    XMesaGarbageCollect();
1339    free(glxCtx);
1340 }
1341
1342
1343 PUBLIC Bool
1344 glXIsDirect( Display *dpy, GLXContext ctx )
1345 {
1346    GLXContext glxCtx = ctx;
1347    (void) ctx;
1348    return glxCtx->isDirect;
1349 }
1350
1351
1352
1353 PUBLIC void
1354 glXSwapBuffers( Display *dpy, GLXDrawable drawable )
1355 {
1356    XMesaBuffer buffer = XMesaFindBuffer( dpy, drawable );
1357    static boolean firsttime = 1, no_rast = 0;
1358
1359    if (firsttime) {
1360       no_rast = getenv("SP_NO_RAST") != NULL;
1361       firsttime = 0;
1362    }
1363
1364    if (no_rast)
1365       return;
1366
1367    if (buffer) {
1368       XMesaSwapBuffers(buffer);
1369    }
1370    else if (_mesa_getenv("MESA_DEBUG")) {
1371       _mesa_warning(NULL, "glXSwapBuffers: invalid drawable 0x%x\n",
1372                     (int) drawable);
1373    }
1374 }
1375
1376
1377
1378 /*** GLX_MESA_copy_sub_buffer ***/
1379
1380 PUBLIC void
1381 glXCopySubBufferMESA( Display *dpy, GLXDrawable drawable,
1382                            int x, int y, int width, int height )
1383 {
1384    XMesaBuffer buffer = XMesaFindBuffer( dpy, drawable );
1385    if (buffer) {
1386       XMesaCopySubBuffer(buffer, x, y, width, height);
1387    }
1388    else if (_mesa_getenv("MESA_DEBUG")) {
1389       _mesa_warning(NULL, "Mesa: glXCopySubBufferMESA: invalid drawable\n");
1390    }
1391 }
1392
1393
1394 PUBLIC Bool
1395 glXQueryVersion( Display *dpy, int *maj, int *min )
1396 {
1397    (void) dpy;
1398    /* Return GLX version, not Mesa version */
1399    assert(CLIENT_MAJOR_VERSION == SERVER_MAJOR_VERSION);
1400    *maj = CLIENT_MAJOR_VERSION;
1401    *min = MIN2( CLIENT_MINOR_VERSION, SERVER_MINOR_VERSION );
1402    return True;
1403 }
1404
1405
1406 /*
1407  * Query the GLX attributes of the given XVisualInfo.
1408  */
1409 static int
1410 get_config( XMesaVisual xmvis, int attrib, int *value, GLboolean fbconfig )
1411 {
1412    ASSERT(xmvis);
1413    switch(attrib) {
1414       case GLX_USE_GL:
1415          if (fbconfig)
1416             return GLX_BAD_ATTRIBUTE;
1417          *value = (int) True;
1418          return 0;
1419       case GLX_BUFFER_SIZE:
1420          *value = xmvis->visinfo->depth;
1421          return 0;
1422       case GLX_LEVEL:
1423          *value = xmvis->mesa_visual.level;
1424          return 0;
1425       case GLX_RGBA:
1426          if (fbconfig)
1427             return GLX_BAD_ATTRIBUTE;
1428          if (xmvis->mesa_visual.rgbMode) {
1429             *value = True;
1430          }
1431          else {
1432             *value = False;
1433          }
1434          return 0;
1435       case GLX_DOUBLEBUFFER:
1436          *value = (int) xmvis->mesa_visual.doubleBufferMode;
1437          return 0;
1438       case GLX_STEREO:
1439          *value = (int) xmvis->mesa_visual.stereoMode;
1440          return 0;
1441       case GLX_AUX_BUFFERS:
1442          *value = xmvis->mesa_visual.numAuxBuffers;
1443          return 0;
1444       case GLX_RED_SIZE:
1445          *value = xmvis->mesa_visual.redBits;
1446          return 0;
1447       case GLX_GREEN_SIZE:
1448          *value = xmvis->mesa_visual.greenBits;
1449          return 0;
1450       case GLX_BLUE_SIZE:
1451          *value = xmvis->mesa_visual.blueBits;
1452          return 0;
1453       case GLX_ALPHA_SIZE:
1454          *value = xmvis->mesa_visual.alphaBits;
1455          return 0;
1456       case GLX_DEPTH_SIZE:
1457          *value = xmvis->mesa_visual.depthBits;
1458          return 0;
1459       case GLX_STENCIL_SIZE:
1460          *value = xmvis->mesa_visual.stencilBits;
1461          return 0;
1462       case GLX_ACCUM_RED_SIZE:
1463          *value = xmvis->mesa_visual.accumRedBits;
1464          return 0;
1465       case GLX_ACCUM_GREEN_SIZE:
1466          *value = xmvis->mesa_visual.accumGreenBits;
1467          return 0;
1468       case GLX_ACCUM_BLUE_SIZE:
1469          *value = xmvis->mesa_visual.accumBlueBits;
1470          return 0;
1471       case GLX_ACCUM_ALPHA_SIZE:
1472          *value = xmvis->mesa_visual.accumAlphaBits;
1473          return 0;
1474
1475       /*
1476        * GLX_EXT_visual_info extension
1477        */
1478       case GLX_X_VISUAL_TYPE_EXT:
1479          switch (xmvis->visinfo->CLASS) {
1480             case StaticGray:   *value = GLX_STATIC_GRAY_EXT;   return 0;
1481             case GrayScale:    *value = GLX_GRAY_SCALE_EXT;    return 0;
1482             case StaticColor:  *value = GLX_STATIC_GRAY_EXT;   return 0;
1483             case PseudoColor:  *value = GLX_PSEUDO_COLOR_EXT;  return 0;
1484             case TrueColor:    *value = GLX_TRUE_COLOR_EXT;    return 0;
1485             case DirectColor:  *value = GLX_DIRECT_COLOR_EXT;  return 0;
1486          }
1487          return 0;
1488       case GLX_TRANSPARENT_TYPE_EXT:
1489          /* normal planes */
1490          *value = GLX_NONE_EXT;
1491          return 0;
1492       case GLX_TRANSPARENT_INDEX_VALUE_EXT:
1493          /* undefined */
1494          return 0;
1495       case GLX_TRANSPARENT_RED_VALUE_EXT:
1496          /* undefined */
1497          return 0;
1498       case GLX_TRANSPARENT_GREEN_VALUE_EXT:
1499          /* undefined */
1500          return 0;
1501       case GLX_TRANSPARENT_BLUE_VALUE_EXT:
1502          /* undefined */
1503          return 0;
1504       case GLX_TRANSPARENT_ALPHA_VALUE_EXT:
1505          /* undefined */
1506          return 0;
1507
1508       /*
1509        * GLX_EXT_visual_info extension
1510        */
1511       case GLX_VISUAL_CAVEAT_EXT:
1512          /* test for zero, just in case */
1513          if (xmvis->mesa_visual.visualRating > 0)
1514             *value = xmvis->mesa_visual.visualRating;
1515          else
1516             *value = GLX_NONE_EXT;
1517          return 0;
1518
1519       /*
1520        * GLX_ARB_multisample
1521        */
1522       case GLX_SAMPLE_BUFFERS_ARB:
1523          *value = 0;
1524          return 0;
1525       case GLX_SAMPLES_ARB:
1526          *value = 0;
1527          return 0;
1528
1529       /*
1530        * For FBConfigs:
1531        */
1532       case GLX_SCREEN_EXT:
1533          if (!fbconfig)
1534             return GLX_BAD_ATTRIBUTE;
1535          *value = xmvis->visinfo->screen;
1536          break;
1537       case GLX_DRAWABLE_TYPE: /*SGIX too */
1538          if (!fbconfig)
1539             return GLX_BAD_ATTRIBUTE;
1540          *value = GLX_WINDOW_BIT | GLX_PIXMAP_BIT | GLX_PBUFFER_BIT;
1541          break;
1542       case GLX_RENDER_TYPE_SGIX:
1543          if (!fbconfig)
1544             return GLX_BAD_ATTRIBUTE;
1545          if (xmvis->mesa_visual.rgbMode)
1546             *value = GLX_RGBA_BIT;
1547          else
1548             *value = GLX_COLOR_INDEX_BIT;
1549          break;
1550       case GLX_X_RENDERABLE_SGIX:
1551          if (!fbconfig)
1552             return GLX_BAD_ATTRIBUTE;
1553          *value = True; /* XXX really? */
1554          break;
1555       case GLX_FBCONFIG_ID_SGIX:
1556          if (!fbconfig)
1557             return GLX_BAD_ATTRIBUTE;
1558          *value = xmvis->visinfo->visualid;
1559          break;
1560       case GLX_MAX_PBUFFER_WIDTH:
1561          if (!fbconfig)
1562             return GLX_BAD_ATTRIBUTE;
1563          /* XXX or MAX_WIDTH? */
1564          *value = DisplayWidth(xmvis->display, xmvis->visinfo->screen);
1565          break;
1566       case GLX_MAX_PBUFFER_HEIGHT:
1567          if (!fbconfig)
1568             return GLX_BAD_ATTRIBUTE;
1569          *value = DisplayHeight(xmvis->display, xmvis->visinfo->screen);
1570          break;
1571       case GLX_MAX_PBUFFER_PIXELS:
1572          if (!fbconfig)
1573             return GLX_BAD_ATTRIBUTE;
1574          *value = DisplayWidth(xmvis->display, xmvis->visinfo->screen) *
1575                   DisplayHeight(xmvis->display, xmvis->visinfo->screen);
1576          break;
1577       case GLX_VISUAL_ID:
1578          if (!fbconfig)
1579             return GLX_BAD_ATTRIBUTE;
1580          *value = xmvis->visinfo->visualid;
1581          break;
1582
1583 #ifdef GLX_EXT_texture_from_pixmap
1584       case GLX_BIND_TO_TEXTURE_RGB_EXT:
1585          *value = True; /*XXX*/
1586          break;
1587       case GLX_BIND_TO_TEXTURE_RGBA_EXT:
1588          /* XXX review */
1589          *value = xmvis->mesa_visual.alphaBits > 0 ? True : False;
1590          break;
1591       case GLX_BIND_TO_MIPMAP_TEXTURE_EXT:
1592          *value = True; /*XXX*/
1593          break;
1594       case GLX_BIND_TO_TEXTURE_TARGETS_EXT:
1595          *value = (GLX_TEXTURE_1D_BIT_EXT |
1596                    GLX_TEXTURE_2D_BIT_EXT |
1597                    GLX_TEXTURE_RECTANGLE_BIT_EXT); /*XXX*/
1598          break;
1599       case GLX_Y_INVERTED_EXT:
1600          *value = True; /*XXX*/
1601          break;
1602 #endif
1603
1604       default:
1605          return GLX_BAD_ATTRIBUTE;
1606    }
1607    return Success;
1608 }
1609
1610
1611 PUBLIC int
1612 glXGetConfig( Display *dpy, XVisualInfo *visinfo,
1613                    int attrib, int *value )
1614 {
1615    XMesaVisual xmvis;
1616    int k;
1617    if (!dpy || !visinfo)
1618       return GLX_BAD_ATTRIBUTE;
1619
1620    xmvis = find_glx_visual( dpy, visinfo );
1621    if (!xmvis) {
1622       /* this visual wasn't obtained with glXChooseVisual */
1623       xmvis = create_glx_visual( dpy, visinfo );
1624       if (!xmvis) {
1625          /* this visual can't be used for GL rendering */
1626          if (attrib==GLX_USE_GL) {
1627             *value = (int) False;
1628             return 0;
1629          }
1630          else {
1631             return GLX_BAD_VISUAL;
1632          }
1633       }
1634    }
1635
1636    k = get_config(xmvis, attrib, value, GL_FALSE);
1637    return k;
1638 }
1639
1640
1641 PUBLIC void
1642 glXWaitGL( void )
1643 {
1644    XMesaContext xmesa = XMesaGetCurrentContext();
1645    XMesaFlush( xmesa );
1646 }
1647
1648
1649
1650 PUBLIC void
1651 glXWaitX( void )
1652 {
1653    XMesaContext xmesa = XMesaGetCurrentContext();
1654    XMesaFlush( xmesa );
1655 }
1656
1657
1658 static const char *
1659 get_extensions( void )
1660 {
1661    return EXTENSIONS;
1662 }
1663
1664
1665
1666 /* GLX 1.1 and later */
1667 PUBLIC const char *
1668 glXQueryExtensionsString( Display *dpy, int screen )
1669 {
1670    (void) dpy;
1671    (void) screen;
1672    return get_extensions();
1673 }
1674
1675
1676
1677 /* GLX 1.1 and later */
1678 PUBLIC const char *
1679 glXQueryServerString( Display *dpy, int screen, int name )
1680 {
1681    static char version[1000];
1682    _mesa_sprintf(version, "%d.%d %s",
1683                  SERVER_MAJOR_VERSION, SERVER_MINOR_VERSION, MESA_GLX_VERSION);
1684
1685    (void) dpy;
1686    (void) screen;
1687
1688    switch (name) {
1689       case GLX_EXTENSIONS:
1690          return get_extensions();
1691       case GLX_VENDOR:
1692          return VENDOR;
1693       case GLX_VERSION:
1694          return version;
1695       default:
1696          return NULL;
1697    }
1698 }
1699
1700
1701
1702 /* GLX 1.1 and later */
1703 PUBLIC const char *
1704 glXGetClientString( Display *dpy, int name )
1705 {
1706    static char version[1000];
1707    _mesa_sprintf(version, "%d.%d %s", CLIENT_MAJOR_VERSION,
1708                  CLIENT_MINOR_VERSION, MESA_GLX_VERSION);
1709
1710    (void) dpy;
1711
1712    switch (name) {
1713       case GLX_EXTENSIONS:
1714          return get_extensions();
1715       case GLX_VENDOR:
1716          return VENDOR;
1717       case GLX_VERSION:
1718          return version;
1719       default:
1720          return NULL;
1721    }
1722 }
1723
1724
1725
1726 /*
1727  * GLX 1.3 and later
1728  */
1729
1730
1731 PUBLIC int
1732 glXGetFBConfigAttrib( Display *dpy, GLXFBConfig config,
1733                            int attribute, int *value )
1734 {
1735    XMesaVisual v = (XMesaVisual) config;
1736    (void) dpy;
1737    (void) config;
1738
1739    if (!dpy || !config || !value)
1740       return -1;
1741
1742    return get_config(v, attribute, value, GL_TRUE);
1743 }
1744
1745
1746 PUBLIC GLXFBConfig *
1747 glXGetFBConfigs( Display *dpy, int screen, int *nelements )
1748 {
1749    XVisualInfo *visuals, visTemplate;
1750    const long visMask = VisualScreenMask;
1751    int i;
1752
1753    /* Get list of all X visuals */
1754    visTemplate.screen = screen;
1755    visuals = XGetVisualInfo(dpy, visMask, &visTemplate, nelements);
1756    if (*nelements > 0) {
1757       XMesaVisual *results;
1758       results = (XMesaVisual *) malloc(*nelements * sizeof(XMesaVisual));
1759       if (!results) {
1760          *nelements = 0;
1761          return NULL;
1762       }
1763       for (i = 0; i < *nelements; i++) {
1764          results[i] = create_glx_visual(dpy, visuals + i);
1765       }
1766       return (GLXFBConfig *) results;
1767    }
1768    return NULL;
1769 }
1770
1771
1772 PUBLIC GLXFBConfig *
1773 glXChooseFBConfig( Display *dpy, int screen,
1774                         const int *attribList, int *nitems )
1775 {
1776    XMesaVisual xmvis;
1777
1778    if (!attribList || !attribList[0]) {
1779       /* return list of all configs (per GLX_SGIX_fbconfig spec) */
1780       return glXGetFBConfigs(dpy, screen, nitems);
1781    }
1782
1783    xmvis = choose_visual(dpy, screen, attribList, GL_TRUE);
1784    if (xmvis) {
1785       GLXFBConfig *config = (GLXFBConfig *) malloc(sizeof(XMesaVisual));
1786       if (!config) {
1787          *nitems = 0;
1788          return NULL;
1789       }
1790       *nitems = 1;
1791       config[0] = (GLXFBConfig) xmvis;
1792       return (GLXFBConfig *) config;
1793    }
1794    else {
1795       *nitems = 0;
1796       return NULL;
1797    }
1798 }
1799
1800
1801 PUBLIC XVisualInfo *
1802 glXGetVisualFromFBConfig( Display *dpy, GLXFBConfig config )
1803 {
1804    if (dpy && config) {
1805       XMesaVisual xmvis = (XMesaVisual) config;
1806 #if 0
1807       return xmvis->vishandle;
1808 #else
1809       /* create a new vishandle - the cached one may be stale */
1810       xmvis->vishandle = (XVisualInfo *) malloc(sizeof(XVisualInfo));
1811       if (xmvis->vishandle) {
1812          memcpy(xmvis->vishandle, xmvis->visinfo, sizeof(XVisualInfo));
1813       }
1814       return xmvis->vishandle;
1815 #endif
1816    }
1817    else {
1818       return NULL;
1819    }
1820 }
1821
1822
1823 PUBLIC GLXWindow
1824 glXCreateWindow( Display *dpy, GLXFBConfig config, Window win,
1825                       const int *attribList )
1826 {
1827    XMesaVisual xmvis = (XMesaVisual) config;
1828    XMesaBuffer xmbuf;
1829    if (!xmvis)
1830       return 0;
1831
1832    xmbuf = XMesaCreateWindowBuffer(xmvis, win);
1833    if (!xmbuf)
1834       return 0;
1835
1836    (void) dpy;
1837    (void) attribList;  /* Ignored in GLX 1.3 */
1838
1839    return win;  /* A hack for now */
1840 }
1841
1842
1843 PUBLIC void
1844 glXDestroyWindow( Display *dpy, GLXWindow window )
1845 {
1846    XMesaBuffer b = XMesaFindBuffer(dpy, (Drawable) window);
1847    if (b)
1848       XMesaDestroyBuffer(b);
1849    /* don't destroy X window */
1850 }
1851
1852
1853 /* XXX untested */
1854 PUBLIC GLXPixmap
1855 glXCreatePixmap( Display *dpy, GLXFBConfig config, Pixmap pixmap,
1856                       const int *attribList )
1857 {
1858    XMesaVisual v = (XMesaVisual) config;
1859    XMesaBuffer b;
1860    const int *attr;
1861    int target = 0, format = 0, mipmap = 0;
1862    int value;
1863
1864    if (!dpy || !config || !pixmap)
1865       return 0;
1866
1867    for (attr = attribList; attr && *attr; attr++) {
1868       switch (*attr) {
1869       case GLX_TEXTURE_FORMAT_EXT:
1870          attr++;
1871          switch (*attr) {
1872          case GLX_TEXTURE_FORMAT_NONE_EXT:
1873          case GLX_TEXTURE_FORMAT_RGB_EXT:
1874          case GLX_TEXTURE_FORMAT_RGBA_EXT:
1875             format = *attr;
1876             break;
1877          default:
1878             /* error */
1879             return 0;
1880          }
1881          break;
1882       case GLX_TEXTURE_TARGET_EXT:
1883          attr++;
1884          switch (*attr) {
1885          case GLX_TEXTURE_1D_EXT:
1886          case GLX_TEXTURE_2D_EXT:
1887          case GLX_TEXTURE_RECTANGLE_EXT:
1888             target = *attr;
1889             break;
1890          default:
1891             /* error */
1892             return 0;
1893          }
1894          break;
1895       case GLX_MIPMAP_TEXTURE_EXT:
1896          attr++;
1897          if (*attr)
1898             mipmap = 1;
1899          break;
1900       default:
1901          /* error */
1902          return 0;
1903       }
1904    }
1905
1906    if (format == GLX_TEXTURE_FORMAT_RGB_EXT) {
1907       if (get_config(v, GLX_BIND_TO_TEXTURE_RGB_EXT,
1908                      &value, GL_TRUE) != Success
1909           || !value) {
1910          return 0; /* error! */
1911       }
1912    }
1913    else if (format == GLX_TEXTURE_FORMAT_RGBA_EXT) {
1914       if (get_config(v, GLX_BIND_TO_TEXTURE_RGBA_EXT,
1915                      &value, GL_TRUE) != Success
1916           || !value) {
1917          return 0; /* error! */
1918       }
1919    }
1920    if (mipmap) {
1921       if (get_config(v, GLX_BIND_TO_MIPMAP_TEXTURE_EXT,
1922                      &value, GL_TRUE) != Success
1923           || !value) {
1924          return 0; /* error! */
1925       }
1926    }
1927    if (target == GLX_TEXTURE_1D_EXT) {
1928       if (get_config(v, GLX_BIND_TO_TEXTURE_TARGETS_EXT,
1929                      &value, GL_TRUE) != Success
1930           || (value & GLX_TEXTURE_1D_BIT_EXT) == 0) {
1931          return 0; /* error! */
1932       }
1933    }
1934    else if (target == GLX_TEXTURE_2D_EXT) {
1935       if (get_config(v, GLX_BIND_TO_TEXTURE_TARGETS_EXT,
1936                      &value, GL_TRUE) != Success
1937           || (value & GLX_TEXTURE_2D_BIT_EXT) == 0) {
1938          return 0; /* error! */
1939       }
1940    }
1941    if (target == GLX_TEXTURE_RECTANGLE_EXT) {
1942       if (get_config(v, GLX_BIND_TO_TEXTURE_TARGETS_EXT,
1943                      &value, GL_TRUE) != Success
1944           || (value & GLX_TEXTURE_RECTANGLE_BIT_EXT) == 0) {
1945          return 0; /* error! */
1946       }
1947    }
1948
1949    if (format || target || mipmap) {
1950       /* texture from pixmap */
1951       b = XMesaCreatePixmapTextureBuffer(v, pixmap, 0, format, target, mipmap);
1952    }
1953    else {
1954       b = XMesaCreatePixmapBuffer( v, pixmap, 0 );
1955    }
1956    if (!b) {
1957       return 0;
1958    }
1959
1960    return pixmap;
1961 }
1962
1963
1964 PUBLIC void
1965 glXDestroyPixmap( Display *dpy, GLXPixmap pixmap )
1966 {
1967    XMesaBuffer b = XMesaFindBuffer(dpy, (Drawable)pixmap);
1968    if (b)
1969       XMesaDestroyBuffer(b);
1970    /* don't destroy X pixmap */
1971 }
1972
1973
1974 PUBLIC GLXPbuffer
1975 glXCreatePbuffer( Display *dpy, GLXFBConfig config,
1976                        const int *attribList )
1977 {
1978    XMesaVisual xmvis = (XMesaVisual) config;
1979    XMesaBuffer xmbuf;
1980    const int *attrib;
1981    int width = 0, height = 0;
1982    GLboolean useLargest = GL_FALSE, preserveContents = GL_FALSE;
1983
1984    (void) dpy;
1985
1986    for (attrib = attribList; *attrib; attrib++) {
1987       switch (*attrib) {
1988          case GLX_PBUFFER_WIDTH:
1989             attrib++;
1990             width = *attrib;
1991             break;
1992          case GLX_PBUFFER_HEIGHT:
1993             attrib++;
1994             height = *attrib;
1995             break;
1996          case GLX_PRESERVED_CONTENTS:
1997             attrib++;
1998             preserveContents = *attrib;
1999             break;
2000          case GLX_LARGEST_PBUFFER:
2001             attrib++;
2002             useLargest = *attrib;
2003             break;
2004          default:
2005             return 0;
2006       }
2007    }
2008
2009    if (width == 0 || height == 0)
2010       return 0;
2011
2012    if (width > MAX_WIDTH || height > MAX_HEIGHT) {
2013       /* If allocation would have failed and GLX_LARGEST_PBUFFER is set,
2014        * allocate the largest possible buffer.
2015        */
2016       if (useLargest) {
2017          width = MAX_WIDTH;
2018          height = MAX_HEIGHT;
2019       }
2020    }
2021
2022    xmbuf = XMesaCreatePBuffer( xmvis, 0, width, height);
2023    /* A GLXPbuffer handle must be an X Drawable because that's what
2024     * glXMakeCurrent takes.
2025     */
2026    if (xmbuf) {
2027       xmbuf->largestPbuffer = useLargest;
2028       xmbuf->preservedContents = preserveContents;
2029       return (GLXPbuffer) xmbuf->drawable;
2030    }
2031    else {
2032       return 0;
2033    }
2034 }
2035
2036
2037 PUBLIC void
2038 glXDestroyPbuffer( Display *dpy, GLXPbuffer pbuf )
2039 {
2040    XMesaBuffer b = XMesaFindBuffer(dpy, pbuf);
2041    if (b) {
2042       XMesaDestroyBuffer(b);
2043    }
2044 }
2045
2046
2047 PUBLIC void
2048 glXQueryDrawable( Display *dpy, GLXDrawable draw, int attribute,
2049                        unsigned int *value )
2050 {
2051    GLuint width, height;
2052    XMesaBuffer xmbuf = XMesaFindBuffer(dpy, draw);
2053    if (!xmbuf)
2054       return;
2055
2056    /* make sure buffer's dimensions are up to date */
2057    xmesa_get_window_size(dpy, xmbuf, &width, &height);
2058
2059    switch (attribute) {
2060       case GLX_WIDTH:
2061          *value = width;
2062          break;
2063       case GLX_HEIGHT:
2064          *value = height;
2065          break;
2066       case GLX_PRESERVED_CONTENTS:
2067          *value = xmbuf->preservedContents;
2068          break;
2069       case GLX_LARGEST_PBUFFER:
2070          *value = xmbuf->largestPbuffer;
2071          break;
2072       case GLX_FBCONFIG_ID:
2073          *value = xmbuf->xm_visual->visinfo->visualid;
2074          return;
2075 #ifdef GLX_EXT_texture_from_pixmap
2076       case GLX_TEXTURE_FORMAT_EXT:
2077          *value = xmbuf->TextureFormat;
2078          break;
2079       case GLX_TEXTURE_TARGET_EXT:
2080          *value = xmbuf->TextureTarget;
2081          break;
2082       case GLX_MIPMAP_TEXTURE_EXT:
2083          *value = xmbuf->TextureMipmap;
2084          break;
2085 #endif
2086
2087       default:
2088          return; /* raise BadValue error */
2089    }
2090 }
2091
2092
2093 PUBLIC GLXContext
2094 glXCreateNewContext( Display *dpy, GLXFBConfig config,
2095                           int renderType, GLXContext shareList, Bool direct )
2096 {
2097    GLXContext glxCtx;
2098    GLXContext shareCtx = shareList;
2099    XMesaVisual xmvis = (XMesaVisual) config;
2100
2101    if (!dpy || !config ||
2102        (renderType != GLX_RGBA_TYPE && renderType != GLX_COLOR_INDEX_TYPE))
2103       return 0;
2104
2105    glxCtx = CALLOC_STRUCT(__GLXcontextRec);
2106    if (!glxCtx)
2107       return 0;
2108
2109    /* deallocate unused windows/buffers */
2110    XMesaGarbageCollect();
2111
2112    glxCtx->xmesaContext = XMesaCreateContext(xmvis,
2113                                    shareCtx ? shareCtx->xmesaContext : NULL);
2114    if (!glxCtx->xmesaContext) {
2115       free(glxCtx);
2116       return NULL;
2117    }
2118
2119    glxCtx->isDirect = DEFAULT_DIRECT;
2120    glxCtx->currentDpy = dpy;
2121    glxCtx->xid = (XID) glxCtx;  /* self pointer */
2122
2123    return glxCtx;
2124 }
2125
2126
2127 PUBLIC int
2128 glXQueryContext( Display *dpy, GLXContext ctx, int attribute, int *value )
2129 {
2130    GLXContext glxCtx = ctx;
2131    XMesaContext xmctx = glxCtx->xmesaContext;
2132
2133    (void) dpy;
2134    (void) ctx;
2135
2136    switch (attribute) {
2137    case GLX_FBCONFIG_ID:
2138       *value = xmctx->xm_visual->visinfo->visualid;
2139       break;
2140    case GLX_RENDER_TYPE:
2141       if (xmctx->xm_visual->mesa_visual.rgbMode)
2142          *value = GLX_RGBA_TYPE;
2143       else
2144          *value = GLX_COLOR_INDEX_TYPE;
2145       break;
2146    case GLX_SCREEN:
2147       *value = 0;
2148       return Success;
2149    default:
2150       return GLX_BAD_ATTRIBUTE;
2151    }
2152    return 0;
2153 }
2154
2155
2156 PUBLIC void
2157 glXSelectEvent( Display *dpy, GLXDrawable drawable, unsigned long mask )
2158 {
2159    XMesaBuffer xmbuf = XMesaFindBuffer(dpy, drawable);
2160    if (xmbuf)
2161       xmbuf->selectedEvents = mask;
2162 }
2163
2164
2165 PUBLIC void
2166 glXGetSelectedEvent( Display *dpy, GLXDrawable drawable,
2167                           unsigned long *mask )
2168 {
2169    XMesaBuffer xmbuf = XMesaFindBuffer(dpy, drawable);
2170    if (xmbuf)
2171       *mask = xmbuf->selectedEvents;
2172    else
2173       *mask = 0;
2174 }
2175
2176
2177
2178 /*** GLX_SGI_swap_control ***/
2179
2180 PUBLIC int
2181 glXSwapIntervalSGI(int interval)
2182 {
2183    (void) interval;
2184    return 0;
2185 }
2186
2187
2188
2189 /*** GLX_SGI_video_sync ***/
2190
2191 static unsigned int FrameCounter = 0;
2192
2193 PUBLIC int
2194 glXGetVideoSyncSGI(unsigned int *count)
2195 {
2196    /* this is a bogus implementation */
2197    *count = FrameCounter++;
2198    return 0;
2199 }
2200
2201 PUBLIC int
2202 glXWaitVideoSyncSGI(int divisor, int remainder, unsigned int *count)
2203 {
2204    if (divisor <= 0 || remainder < 0)
2205       return GLX_BAD_VALUE;
2206    /* this is a bogus implementation */
2207    FrameCounter++;
2208    while (FrameCounter % divisor != remainder)
2209       FrameCounter++;
2210    *count = FrameCounter;
2211    return 0;
2212 }
2213
2214
2215
2216 /*** GLX_SGI_make_current_read ***/
2217
2218 PUBLIC Bool
2219 glXMakeCurrentReadSGI(Display *dpy, GLXDrawable draw, GLXDrawable read, GLXContext ctx)
2220 {
2221    return glXMakeContextCurrent( dpy, draw, read, ctx );
2222 }
2223
2224 /* not used
2225 static GLXDrawable
2226 glXGetCurrentReadDrawableSGI(void)
2227 {
2228    return 0;
2229 }
2230 */
2231
2232
2233 /*** GLX_SGIX_video_source ***/
2234 #if defined(_VL_H)
2235
2236 PUBLIC GLXVideoSourceSGIX
2237 glXCreateGLXVideoSourceSGIX(Display *dpy, int screen, VLServer server, VLPath path, int nodeClass, VLNode drainNode)
2238 {
2239    (void) dpy;
2240    (void) screen;
2241    (void) server;
2242    (void) path;
2243    (void) nodeClass;
2244    (void) drainNode;
2245    return 0;
2246 }
2247
2248 PUBLIC void
2249 glXDestroyGLXVideoSourceSGIX(Display *dpy, GLXVideoSourceSGIX src)
2250 {
2251    (void) dpy;
2252    (void) src;
2253 }
2254
2255 #endif
2256
2257
2258 /*** GLX_EXT_import_context ***/
2259
2260 PUBLIC void
2261 glXFreeContextEXT(Display *dpy, GLXContext context)
2262 {
2263    (void) dpy;
2264    (void) context;
2265 }
2266
2267 PUBLIC GLXContextID
2268 glXGetContextIDEXT(const GLXContext context)
2269 {
2270    (void) context;
2271    return 0;
2272 }
2273
2274 PUBLIC GLXContext
2275 glXImportContextEXT(Display *dpy, GLXContextID contextID)
2276 {
2277    (void) dpy;
2278    (void) contextID;
2279    return 0;
2280 }
2281
2282 PUBLIC int
2283 glXQueryContextInfoEXT(Display *dpy, GLXContext context, int attribute, int *value)
2284 {
2285    (void) dpy;
2286    (void) context;
2287    (void) attribute;
2288    (void) value;
2289    return 0;
2290 }
2291
2292
2293
2294 /*** GLX_SGIX_fbconfig ***/
2295
2296 PUBLIC int
2297 glXGetFBConfigAttribSGIX(Display *dpy, GLXFBConfigSGIX config, int attribute, int *value)
2298 {
2299    return glXGetFBConfigAttrib(dpy, config, attribute, value);
2300 }
2301
2302 PUBLIC GLXFBConfigSGIX *
2303 glXChooseFBConfigSGIX(Display *dpy, int screen, int *attrib_list, int *nelements)
2304 {
2305    return (GLXFBConfig *) glXChooseFBConfig(dpy, screen, attrib_list, nelements);
2306 }
2307
2308
2309 PUBLIC GLXPixmap
2310 glXCreateGLXPixmapWithConfigSGIX(Display *dpy, GLXFBConfigSGIX config, Pixmap pixmap)
2311 {
2312    XMesaVisual xmvis = (XMesaVisual) config;
2313    XMesaBuffer xmbuf = XMesaCreatePixmapBuffer(xmvis, pixmap, 0);
2314    return xmbuf->drawable; /* need to return an X ID */
2315 }
2316
2317
2318 PUBLIC GLXContext
2319 glXCreateContextWithConfigSGIX(Display *dpy, GLXFBConfigSGIX config, int render_type, GLXContext share_list, Bool direct)
2320 {
2321    XMesaVisual xmvis = (XMesaVisual) config;
2322    GLXContext glxCtx;
2323    GLXContext shareCtx = share_list;
2324
2325    glxCtx = CALLOC_STRUCT(__GLXcontextRec);
2326    if (!glxCtx)
2327       return 0;
2328
2329    /* deallocate unused windows/buffers */
2330    XMesaGarbageCollect();
2331
2332    glxCtx->xmesaContext = XMesaCreateContext(xmvis,
2333                                    shareCtx ? shareCtx->xmesaContext : NULL);
2334    if (!glxCtx->xmesaContext) {
2335       free(glxCtx);
2336       return NULL;
2337    }
2338
2339    glxCtx->isDirect = DEFAULT_DIRECT;
2340    glxCtx->currentDpy = dpy;
2341    glxCtx->xid = (XID) glxCtx;  /* self pointer */
2342
2343    return glxCtx;
2344 }
2345
2346
2347 PUBLIC XVisualInfo *
2348 glXGetVisualFromFBConfigSGIX(Display *dpy, GLXFBConfigSGIX config)
2349 {
2350    return glXGetVisualFromFBConfig(dpy, config);
2351 }
2352
2353
2354 PUBLIC GLXFBConfigSGIX
2355 glXGetFBConfigFromVisualSGIX(Display *dpy, XVisualInfo *vis)
2356 {
2357    XMesaVisual xmvis = find_glx_visual(dpy, vis);
2358    if (!xmvis) {
2359       /* This visual wasn't found with glXChooseVisual() */
2360       xmvis = create_glx_visual(dpy, vis);
2361    }
2362
2363    return (GLXFBConfigSGIX) xmvis;
2364 }
2365
2366
2367
2368 /*** GLX_SGIX_pbuffer ***/
2369
2370 PUBLIC GLXPbufferSGIX
2371 glXCreateGLXPbufferSGIX(Display *dpy, GLXFBConfigSGIX config,
2372                              unsigned int width, unsigned int height,
2373                              int *attribList)
2374 {
2375    XMesaVisual xmvis = (XMesaVisual) config;
2376    XMesaBuffer xmbuf;
2377    const int *attrib;
2378    GLboolean useLargest = GL_FALSE, preserveContents = GL_FALSE;
2379
2380    (void) dpy;
2381
2382    for (attrib = attribList; attrib && *attrib; attrib++) {
2383       switch (*attrib) {
2384          case GLX_PRESERVED_CONTENTS_SGIX:
2385             attrib++;
2386             preserveContents = *attrib; /* ignored */
2387             break;
2388          case GLX_LARGEST_PBUFFER_SGIX:
2389             attrib++;
2390             useLargest = *attrib; /* ignored */
2391             break;
2392          default:
2393             return 0;
2394       }
2395    }
2396
2397    /* not used at this time */
2398    (void) useLargest;
2399    (void) preserveContents;
2400
2401    xmbuf = XMesaCreatePBuffer( xmvis, 0, width, height);
2402    /* A GLXPbuffer handle must be an X Drawable because that's what
2403     * glXMakeCurrent takes.
2404     */
2405    return (GLXPbuffer) xmbuf->drawable;
2406 }
2407
2408
2409 PUBLIC void
2410 glXDestroyGLXPbufferSGIX(Display *dpy, GLXPbufferSGIX pbuf)
2411 {
2412    XMesaBuffer xmbuf = XMesaFindBuffer(dpy, pbuf);
2413    if (xmbuf) {
2414       XMesaDestroyBuffer(xmbuf);
2415    }
2416 }
2417
2418
2419 PUBLIC int
2420 glXQueryGLXPbufferSGIX(Display *dpy, GLXPbufferSGIX pbuf, int attribute, unsigned int *value)
2421 {
2422    const XMesaBuffer xmbuf = XMesaFindBuffer(dpy, pbuf);
2423
2424    if (!xmbuf) {
2425       /* Generate GLXBadPbufferSGIX for bad pbuffer */
2426       return 0;
2427    }
2428
2429    switch (attribute) {
2430       case GLX_PRESERVED_CONTENTS_SGIX:
2431          *value = True;
2432          break;
2433       case GLX_LARGEST_PBUFFER_SGIX:
2434          *value = xmesa_buffer_width(xmbuf) * xmesa_buffer_height(xmbuf);
2435          break;
2436       case GLX_WIDTH_SGIX:
2437          *value = xmesa_buffer_width(xmbuf);
2438          break;
2439       case GLX_HEIGHT_SGIX:
2440          *value = xmesa_buffer_height(xmbuf);
2441          break;
2442       case GLX_EVENT_MASK_SGIX:
2443          *value = 0;  /* XXX might be wrong */
2444          break;
2445       default:
2446          *value = 0;
2447    }
2448    return 0;
2449 }
2450
2451
2452 PUBLIC void
2453 glXSelectEventSGIX(Display *dpy, GLXDrawable drawable, unsigned long mask)
2454 {
2455    XMesaBuffer xmbuf = XMesaFindBuffer(dpy, drawable);
2456    if (xmbuf) {
2457       /* Note: we'll never generate clobber events */
2458       xmbuf->selectedEvents = mask;
2459    }
2460 }
2461
2462
2463 PUBLIC void
2464 glXGetSelectedEventSGIX(Display *dpy, GLXDrawable drawable, unsigned long *mask)
2465 {
2466    XMesaBuffer xmbuf = XMesaFindBuffer(dpy, drawable);
2467    if (xmbuf) {
2468       *mask = xmbuf->selectedEvents;
2469    }
2470    else {
2471       *mask = 0;
2472    }
2473 }
2474
2475
2476
2477 /*** GLX_SGI_cushion ***/
2478
2479 PUBLIC void
2480 glXCushionSGI(Display *dpy, Window win, float cushion)
2481 {
2482    (void) dpy;
2483    (void) win;
2484    (void) cushion;
2485 }
2486
2487
2488
2489 /*** GLX_SGIX_video_resize ***/
2490
2491 PUBLIC int
2492 glXBindChannelToWindowSGIX(Display *dpy, int screen, int channel , Window window)
2493 {
2494    (void) dpy;
2495    (void) screen;
2496    (void) channel;
2497    (void) window;
2498    return 0;
2499 }
2500
2501 PUBLIC int
2502 glXChannelRectSGIX(Display *dpy, int screen, int channel, int x, int y, int w, int h)
2503 {
2504    (void) dpy;
2505    (void) screen;
2506    (void) channel;
2507    (void) x;
2508    (void) y;
2509    (void) w;
2510    (void) h;
2511    return 0;
2512 }
2513
2514 PUBLIC int
2515 glXQueryChannelRectSGIX(Display *dpy, int screen, int channel, int *x, int *y, int *w, int *h)
2516 {
2517    (void) dpy;
2518    (void) screen;
2519    (void) channel;
2520    (void) x;
2521    (void) y;
2522    (void) w;
2523    (void) h;
2524    return 0;
2525 }
2526
2527 PUBLIC int
2528 glXQueryChannelDeltasSGIX(Display *dpy, int screen, int channel, int *dx, int *dy, int *dw, int *dh)
2529 {
2530    (void) dpy;
2531    (void) screen;
2532    (void) channel;
2533    (void) dx;
2534    (void) dy;
2535    (void) dw;
2536    (void) dh;
2537    return 0;
2538 }
2539
2540 PUBLIC int
2541 glXChannelRectSyncSGIX(Display *dpy, int screen, int channel, GLenum synctype)
2542 {
2543    (void) dpy;
2544    (void) screen;
2545    (void) channel;
2546    (void) synctype;
2547    return 0;
2548 }
2549
2550
2551
2552 /*** GLX_SGIX_dmbuffer **/
2553
2554 #if defined(_DM_BUFFER_H_)
2555 PUBLIC Bool
2556 glXAssociateDMPbufferSGIX(Display *dpy, GLXPbufferSGIX pbuffer, DMparams *params, DMbuffer dmbuffer)
2557 {
2558    (void) dpy;
2559    (void) pbuffer;
2560    (void) params;
2561    (void) dmbuffer;
2562    return False;
2563 }
2564 #endif
2565
2566
2567 /*** GLX_SGIX_swap_group ***/
2568
2569 PUBLIC void
2570 glXJoinSwapGroupSGIX(Display *dpy, GLXDrawable drawable, GLXDrawable member)
2571 {
2572    (void) dpy;
2573    (void) drawable;
2574    (void) member;
2575 }
2576
2577
2578
2579 /*** GLX_SGIX_swap_barrier ***/
2580
2581 PUBLIC void
2582 glXBindSwapBarrierSGIX(Display *dpy, GLXDrawable drawable, int barrier)
2583 {
2584    (void) dpy;
2585    (void) drawable;
2586    (void) barrier;
2587 }
2588
2589 PUBLIC Bool
2590 glXQueryMaxSwapBarriersSGIX(Display *dpy, int screen, int *max)
2591 {
2592    (void) dpy;
2593    (void) screen;
2594    (void) max;
2595    return False;
2596 }
2597
2598
2599
2600 /*** GLX_SUN_get_transparent_index ***/
2601
2602 PUBLIC Status
2603 glXGetTransparentIndexSUN(Display *dpy, Window overlay, Window underlay, long *pTransparent)
2604 {
2605    (void) dpy;
2606    (void) overlay;
2607    (void) underlay;
2608    (void) pTransparent;
2609    return 0;
2610 }
2611
2612
2613
2614 /*** GLX_MESA_release_buffers ***/
2615
2616 /*
2617  * Release the depth, stencil, accum buffers attached to a GLXDrawable
2618  * (a window or pixmap) prior to destroying the GLXDrawable.
2619  */
2620 PUBLIC Bool
2621 glXReleaseBuffersMESA( Display *dpy, GLXDrawable d )
2622 {
2623    XMesaBuffer b = XMesaFindBuffer(dpy, d);
2624    if (b) {
2625       XMesaDestroyBuffer(b);
2626       return True;
2627    }
2628    return False;
2629 }
2630
2631 /*** GLX_EXT_texture_from_pixmap ***/
2632
2633 PUBLIC void
2634 glXBindTexImageEXT(Display *dpy, GLXDrawable drawable, int buffer,
2635                         const int *attrib_list)
2636 {
2637    XMesaBuffer b = XMesaFindBuffer(dpy, drawable);
2638    if (b)
2639       XMesaBindTexImage(dpy, b, buffer, attrib_list);
2640 }
2641
2642 PUBLIC void
2643 glXReleaseTexImageEXT(Display *dpy, GLXDrawable drawable, int buffer)
2644 {
2645    XMesaBuffer b = XMesaFindBuffer(dpy, drawable);
2646    if (b)
2647       XMesaReleaseTexImage(dpy, b, buffer);
2648 }