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