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 /**
1022  * Helper function used by other glXCreateContext functions.
1023  */
1024 static GLXContext
1025 create_context(Display *dpy, XMesaVisual xmvis,
1026                XMesaContext shareCtx, Bool direct)
1027 {
1028    GLXContext glxCtx;
1029
1030    if (!dpy || !xmvis)
1031       return 0;
1032
1033    glxCtx = CALLOC_STRUCT(__GLXcontextRec);
1034    if (!glxCtx)
1035       return 0;
1036
1037    /* deallocate unused windows/buffers */
1038 #if 0
1039    XMesaGarbageCollect();
1040 #endif
1041
1042    glxCtx->xmesaContext = XMesaCreateContext(xmvis, shareCtx);
1043    if (!glxCtx->xmesaContext) {
1044       free(glxCtx);
1045       return NULL;
1046    }
1047
1048    glxCtx->isDirect = DEFAULT_DIRECT;
1049    glxCtx->currentDpy = dpy;
1050    glxCtx->xid = (XID) glxCtx;  /* self pointer */
1051
1052    return glxCtx;
1053 }
1054
1055
1056 PUBLIC GLXContext
1057 glXCreateContext( Display *dpy, XVisualInfo *visinfo,
1058                   GLXContext shareCtx, Bool direct )
1059 {
1060    XMesaVisual xmvis;
1061
1062    xmvis = find_glx_visual( dpy, visinfo );
1063    if (!xmvis) {
1064       /* This visual wasn't found with glXChooseVisual() */
1065       xmvis = create_glx_visual( dpy, visinfo );
1066       if (!xmvis) {
1067          /* unusable visual */
1068          return NULL;
1069       }
1070    }
1071
1072    return create_context(dpy, xmvis,
1073                          shareCtx ? shareCtx->xmesaContext : NULL,
1074                          direct);
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       glFlush();
1307    }
1308    XMesaCopyContext(xm_src, xm_dst, 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    sprintf(version, "%d.%d %s",
1683            SERVER_MAJOR_VERSION, SERVER_MINOR_VERSION, xmesa_get_name());
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    sprintf(version, "%d.%d %s", CLIENT_MAJOR_VERSION,
1708            CLIENT_MINOR_VERSION, xmesa_get_name());
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          if (!results[i]) {
1766             *nelements = i;
1767             break;
1768          }
1769       }
1770       return (GLXFBConfig *) results;
1771    }
1772    return NULL;
1773 }
1774
1775
1776 PUBLIC GLXFBConfig *
1777 glXChooseFBConfig(Display *dpy, int screen,
1778                   const int *attribList, int *nitems)
1779 {
1780    XMesaVisual xmvis;
1781
1782    if (!attribList || !attribList[0]) {
1783       /* return list of all configs (per GLX_SGIX_fbconfig spec) */
1784       return glXGetFBConfigs(dpy, screen, nitems);
1785    }
1786
1787    xmvis = choose_visual(dpy, screen, attribList, GL_TRUE);
1788    if (xmvis) {
1789       GLXFBConfig *config = (GLXFBConfig *) malloc(sizeof(XMesaVisual));
1790       if (!config) {
1791          *nitems = 0;
1792          return NULL;
1793       }
1794       *nitems = 1;
1795       config[0] = (GLXFBConfig) xmvis;
1796       return (GLXFBConfig *) config;
1797    }
1798    else {
1799       *nitems = 0;
1800       return NULL;
1801    }
1802 }
1803
1804
1805 PUBLIC XVisualInfo *
1806 glXGetVisualFromFBConfig( Display *dpy, GLXFBConfig config )
1807 {
1808    if (dpy && config) {
1809       XMesaVisual xmvis = (XMesaVisual) config;
1810 #if 0
1811       return xmvis->vishandle;
1812 #else
1813       /* create a new vishandle - the cached one may be stale */
1814       xmvis->vishandle = (XVisualInfo *) malloc(sizeof(XVisualInfo));
1815       if (xmvis->vishandle) {
1816          memcpy(xmvis->vishandle, xmvis->visinfo, sizeof(XVisualInfo));
1817       }
1818       return xmvis->vishandle;
1819 #endif
1820    }
1821    else {
1822       return NULL;
1823    }
1824 }
1825
1826
1827 PUBLIC GLXWindow
1828 glXCreateWindow(Display *dpy, GLXFBConfig config, Window win,
1829                 const int *attribList)
1830 {
1831    XMesaVisual xmvis = (XMesaVisual) config;
1832    XMesaBuffer xmbuf;
1833    if (!xmvis)
1834       return 0;
1835
1836    xmbuf = XMesaCreateWindowBuffer(xmvis, win);
1837    if (!xmbuf)
1838       return 0;
1839
1840    (void) dpy;
1841    (void) attribList;  /* Ignored in GLX 1.3 */
1842
1843    return win;  /* A hack for now */
1844 }
1845
1846
1847 PUBLIC void
1848 glXDestroyWindow( Display *dpy, GLXWindow window )
1849 {
1850    XMesaBuffer b = XMesaFindBuffer(dpy, (Drawable) window);
1851    if (b)
1852       XMesaDestroyBuffer(b);
1853    /* don't destroy X window */
1854 }
1855
1856
1857 /* XXX untested */
1858 PUBLIC GLXPixmap
1859 glXCreatePixmap(Display *dpy, GLXFBConfig config, Pixmap pixmap,
1860                 const int *attribList)
1861 {
1862    XMesaVisual v = (XMesaVisual) config;
1863    XMesaBuffer b;
1864    const int *attr;
1865    int target = 0, format = 0, mipmap = 0;
1866    int value;
1867
1868    if (!dpy || !config || !pixmap)
1869       return 0;
1870
1871    for (attr = attribList; attr && *attr; attr++) {
1872       switch (*attr) {
1873       case GLX_TEXTURE_FORMAT_EXT:
1874          attr++;
1875          switch (*attr) {
1876          case GLX_TEXTURE_FORMAT_NONE_EXT:
1877          case GLX_TEXTURE_FORMAT_RGB_EXT:
1878          case GLX_TEXTURE_FORMAT_RGBA_EXT:
1879             format = *attr;
1880             break;
1881          default:
1882             /* error */
1883             return 0;
1884          }
1885          break;
1886       case GLX_TEXTURE_TARGET_EXT:
1887          attr++;
1888          switch (*attr) {
1889          case GLX_TEXTURE_1D_EXT:
1890          case GLX_TEXTURE_2D_EXT:
1891          case GLX_TEXTURE_RECTANGLE_EXT:
1892             target = *attr;
1893             break;
1894          default:
1895             /* error */
1896             return 0;
1897          }
1898          break;
1899       case GLX_MIPMAP_TEXTURE_EXT:
1900          attr++;
1901          if (*attr)
1902             mipmap = 1;
1903          break;
1904       default:
1905          /* error */
1906          return 0;
1907       }
1908    }
1909
1910    if (format == GLX_TEXTURE_FORMAT_RGB_EXT) {
1911       if (get_config(v, GLX_BIND_TO_TEXTURE_RGB_EXT,
1912                      &value, GL_TRUE) != Success
1913           || !value) {
1914          return 0; /* error! */
1915       }
1916    }
1917    else if (format == GLX_TEXTURE_FORMAT_RGBA_EXT) {
1918       if (get_config(v, GLX_BIND_TO_TEXTURE_RGBA_EXT,
1919                      &value, GL_TRUE) != Success
1920           || !value) {
1921          return 0; /* error! */
1922       }
1923    }
1924    if (mipmap) {
1925       if (get_config(v, GLX_BIND_TO_MIPMAP_TEXTURE_EXT,
1926                      &value, GL_TRUE) != Success
1927           || !value) {
1928          return 0; /* error! */
1929       }
1930    }
1931    if (target == GLX_TEXTURE_1D_EXT) {
1932       if (get_config(v, GLX_BIND_TO_TEXTURE_TARGETS_EXT,
1933                      &value, GL_TRUE) != Success
1934           || (value & GLX_TEXTURE_1D_BIT_EXT) == 0) {
1935          return 0; /* error! */
1936       }
1937    }
1938    else if (target == GLX_TEXTURE_2D_EXT) {
1939       if (get_config(v, GLX_BIND_TO_TEXTURE_TARGETS_EXT,
1940                      &value, GL_TRUE) != Success
1941           || (value & GLX_TEXTURE_2D_BIT_EXT) == 0) {
1942          return 0; /* error! */
1943       }
1944    }
1945    if (target == GLX_TEXTURE_RECTANGLE_EXT) {
1946       if (get_config(v, GLX_BIND_TO_TEXTURE_TARGETS_EXT,
1947                      &value, GL_TRUE) != Success
1948           || (value & GLX_TEXTURE_RECTANGLE_BIT_EXT) == 0) {
1949          return 0; /* error! */
1950       }
1951    }
1952
1953    if (format || target || mipmap) {
1954       /* texture from pixmap */
1955       b = XMesaCreatePixmapTextureBuffer(v, pixmap, 0, format, target, mipmap);
1956    }
1957    else {
1958       b = XMesaCreatePixmapBuffer( v, pixmap, 0 );
1959    }
1960    if (!b) {
1961       return 0;
1962    }
1963
1964    return pixmap;
1965 }
1966
1967
1968 PUBLIC void
1969 glXDestroyPixmap( Display *dpy, GLXPixmap pixmap )
1970 {
1971    XMesaBuffer b = XMesaFindBuffer(dpy, (Drawable)pixmap);
1972    if (b)
1973       XMesaDestroyBuffer(b);
1974    /* don't destroy X pixmap */
1975 }
1976
1977
1978 PUBLIC GLXPbuffer
1979 glXCreatePbuffer(Display *dpy, GLXFBConfig config, const int *attribList)
1980 {
1981    XMesaVisual xmvis = (XMesaVisual) config;
1982    XMesaBuffer xmbuf;
1983    const int *attrib;
1984    int width = 0, height = 0;
1985    GLboolean useLargest = GL_FALSE, preserveContents = GL_FALSE;
1986
1987    (void) dpy;
1988
1989    for (attrib = attribList; *attrib; attrib++) {
1990       switch (*attrib) {
1991          case GLX_PBUFFER_WIDTH:
1992             attrib++;
1993             width = *attrib;
1994             break;
1995          case GLX_PBUFFER_HEIGHT:
1996             attrib++;
1997             height = *attrib;
1998             break;
1999          case GLX_PRESERVED_CONTENTS:
2000             attrib++;
2001             preserveContents = *attrib;
2002             break;
2003          case GLX_LARGEST_PBUFFER:
2004             attrib++;
2005             useLargest = *attrib;
2006             break;
2007          default:
2008             return 0;
2009       }
2010    }
2011
2012    if (width == 0 || height == 0)
2013       return 0;
2014
2015    if (width > MAX_WIDTH || height > MAX_HEIGHT) {
2016       /* If allocation would have failed and GLX_LARGEST_PBUFFER is set,
2017        * allocate the largest possible buffer.
2018        */
2019       if (useLargest) {
2020          width = MAX_WIDTH;
2021          height = MAX_HEIGHT;
2022       }
2023    }
2024
2025    xmbuf = XMesaCreatePBuffer( xmvis, 0, width, height);
2026    /* A GLXPbuffer handle must be an X Drawable because that's what
2027     * glXMakeCurrent takes.
2028     */
2029    if (xmbuf) {
2030       xmbuf->largestPbuffer = useLargest;
2031       xmbuf->preservedContents = preserveContents;
2032       return (GLXPbuffer) xmbuf->drawable;
2033    }
2034    else {
2035       return 0;
2036    }
2037 }
2038
2039
2040 PUBLIC void
2041 glXDestroyPbuffer( Display *dpy, GLXPbuffer pbuf )
2042 {
2043    XMesaBuffer b = XMesaFindBuffer(dpy, pbuf);
2044    if (b) {
2045       XMesaDestroyBuffer(b);
2046    }
2047 }
2048
2049
2050 PUBLIC void
2051 glXQueryDrawable(Display *dpy, GLXDrawable draw, int attribute,
2052                  unsigned int *value)
2053 {
2054    GLuint width, height;
2055    XMesaBuffer xmbuf = XMesaFindBuffer(dpy, draw);
2056    if (!xmbuf)
2057       return;
2058
2059    /* make sure buffer's dimensions are up to date */
2060    xmesa_get_window_size(dpy, xmbuf, &width, &height);
2061
2062    switch (attribute) {
2063       case GLX_WIDTH:
2064          *value = width;
2065          break;
2066       case GLX_HEIGHT:
2067          *value = height;
2068          break;
2069       case GLX_PRESERVED_CONTENTS:
2070          *value = xmbuf->preservedContents;
2071          break;
2072       case GLX_LARGEST_PBUFFER:
2073          *value = xmbuf->largestPbuffer;
2074          break;
2075       case GLX_FBCONFIG_ID:
2076          *value = xmbuf->xm_visual->visinfo->visualid;
2077          return;
2078 #ifdef GLX_EXT_texture_from_pixmap
2079       case GLX_TEXTURE_FORMAT_EXT:
2080          *value = xmbuf->TextureFormat;
2081          break;
2082       case GLX_TEXTURE_TARGET_EXT:
2083          *value = xmbuf->TextureTarget;
2084          break;
2085       case GLX_MIPMAP_TEXTURE_EXT:
2086          *value = xmbuf->TextureMipmap;
2087          break;
2088 #endif
2089
2090       default:
2091          return; /* raise BadValue error */
2092    }
2093 }
2094
2095
2096 PUBLIC GLXContext
2097 glXCreateNewContext( Display *dpy, GLXFBConfig config,
2098                      int renderType, GLXContext shareCtx, Bool direct )
2099 {
2100    XMesaVisual xmvis = (XMesaVisual) config;
2101
2102    if (!dpy || !config ||
2103        (renderType != GLX_RGBA_TYPE && renderType != GLX_COLOR_INDEX_TYPE))
2104       return 0;
2105
2106    return create_context(dpy, xmvis,
2107                          shareCtx ? shareCtx->xmesaContext : NULL,
2108                          direct);
2109 }
2110
2111
2112 PUBLIC int
2113 glXQueryContext( Display *dpy, GLXContext ctx, int attribute, int *value )
2114 {
2115    GLXContext glxCtx = ctx;
2116    XMesaContext xmctx = glxCtx->xmesaContext;
2117
2118    (void) dpy;
2119    (void) ctx;
2120
2121    switch (attribute) {
2122    case GLX_FBCONFIG_ID:
2123       *value = xmctx->xm_visual->visinfo->visualid;
2124       break;
2125    case GLX_RENDER_TYPE:
2126       if (xmctx->xm_visual->mesa_visual.rgbMode)
2127          *value = GLX_RGBA_TYPE;
2128       else
2129          *value = GLX_COLOR_INDEX_TYPE;
2130       break;
2131    case GLX_SCREEN:
2132       *value = 0;
2133       return Success;
2134    default:
2135       return GLX_BAD_ATTRIBUTE;
2136    }
2137    return 0;
2138 }
2139
2140
2141 PUBLIC void
2142 glXSelectEvent( Display *dpy, GLXDrawable drawable, unsigned long mask )
2143 {
2144    XMesaBuffer xmbuf = XMesaFindBuffer(dpy, drawable);
2145    if (xmbuf)
2146       xmbuf->selectedEvents = mask;
2147 }
2148
2149
2150 PUBLIC void
2151 glXGetSelectedEvent(Display *dpy, GLXDrawable drawable, unsigned long *mask)
2152 {
2153    XMesaBuffer xmbuf = XMesaFindBuffer(dpy, drawable);
2154    if (xmbuf)
2155       *mask = xmbuf->selectedEvents;
2156    else
2157       *mask = 0;
2158 }
2159
2160
2161
2162 /*** GLX_SGI_swap_control ***/
2163
2164 PUBLIC int
2165 glXSwapIntervalSGI(int interval)
2166 {
2167    (void) interval;
2168    return 0;
2169 }
2170
2171
2172
2173 /*** GLX_SGI_video_sync ***/
2174
2175 static unsigned int FrameCounter = 0;
2176
2177 PUBLIC int
2178 glXGetVideoSyncSGI(unsigned int *count)
2179 {
2180    /* this is a bogus implementation */
2181    *count = FrameCounter++;
2182    return 0;
2183 }
2184
2185 PUBLIC int
2186 glXWaitVideoSyncSGI(int divisor, int remainder, unsigned int *count)
2187 {
2188    if (divisor <= 0 || remainder < 0)
2189       return GLX_BAD_VALUE;
2190    /* this is a bogus implementation */
2191    FrameCounter++;
2192    while (FrameCounter % divisor != remainder)
2193       FrameCounter++;
2194    *count = FrameCounter;
2195    return 0;
2196 }
2197
2198
2199
2200 /*** GLX_SGI_make_current_read ***/
2201
2202 PUBLIC Bool
2203 glXMakeCurrentReadSGI(Display *dpy, GLXDrawable draw, GLXDrawable read,
2204                       GLXContext ctx)
2205 {
2206    return glXMakeContextCurrent( dpy, draw, read, ctx );
2207 }
2208
2209 /* not used
2210 static GLXDrawable
2211 glXGetCurrentReadDrawableSGI(void)
2212 {
2213    return 0;
2214 }
2215 */
2216
2217
2218 /*** GLX_SGIX_video_source ***/
2219 #if defined(_VL_H)
2220
2221 PUBLIC GLXVideoSourceSGIX
2222 glXCreateGLXVideoSourceSGIX(Display *dpy, int screen, VLServer server,
2223                             VLPath path, int nodeClass, VLNode drainNode)
2224 {
2225    (void) dpy;
2226    (void) screen;
2227    (void) server;
2228    (void) path;
2229    (void) nodeClass;
2230    (void) drainNode;
2231    return 0;
2232 }
2233
2234 PUBLIC void
2235 glXDestroyGLXVideoSourceSGIX(Display *dpy, GLXVideoSourceSGIX src)
2236 {
2237    (void) dpy;
2238    (void) src;
2239 }
2240
2241 #endif
2242
2243
2244 /*** GLX_EXT_import_context ***/
2245
2246 PUBLIC void
2247 glXFreeContextEXT(Display *dpy, GLXContext context)
2248 {
2249    (void) dpy;
2250    (void) context;
2251 }
2252
2253 PUBLIC GLXContextID
2254 glXGetContextIDEXT(const GLXContext context)
2255 {
2256    (void) context;
2257    return 0;
2258 }
2259
2260 PUBLIC GLXContext
2261 glXImportContextEXT(Display *dpy, GLXContextID contextID)
2262 {
2263    (void) dpy;
2264    (void) contextID;
2265    return 0;
2266 }
2267
2268 PUBLIC int
2269 glXQueryContextInfoEXT(Display *dpy, GLXContext context, int attribute,
2270                        int *value)
2271 {
2272    (void) dpy;
2273    (void) context;
2274    (void) attribute;
2275    (void) value;
2276    return 0;
2277 }
2278
2279
2280
2281 /*** GLX_SGIX_fbconfig ***/
2282
2283 PUBLIC int
2284 glXGetFBConfigAttribSGIX(Display *dpy, GLXFBConfigSGIX config,
2285                          int attribute, int *value)
2286 {
2287    return glXGetFBConfigAttrib(dpy, config, attribute, value);
2288 }
2289
2290 PUBLIC GLXFBConfigSGIX *
2291 glXChooseFBConfigSGIX(Display *dpy, int screen, int *attrib_list,
2292                       int *nelements)
2293 {
2294    return (GLXFBConfig *) glXChooseFBConfig(dpy, screen,
2295                                             attrib_list, nelements);
2296 }
2297
2298
2299 PUBLIC GLXPixmap
2300 glXCreateGLXPixmapWithConfigSGIX(Display *dpy, GLXFBConfigSGIX config,
2301                                  Pixmap pixmap)
2302 {
2303    XMesaVisual xmvis = (XMesaVisual) config;
2304    XMesaBuffer xmbuf = XMesaCreatePixmapBuffer(xmvis, pixmap, 0);
2305    return xmbuf->drawable; /* need to return an X ID */
2306 }
2307
2308
2309 PUBLIC GLXContext
2310 glXCreateContextWithConfigSGIX(Display *dpy, GLXFBConfigSGIX config,
2311                                int renderType, GLXContext shareCtx,
2312                                Bool direct)
2313 {
2314    XMesaVisual xmvis = (XMesaVisual) config;
2315
2316    if (!dpy || !config ||
2317        (renderType != GLX_RGBA_TYPE && renderType != GLX_COLOR_INDEX_TYPE))
2318       return 0;
2319
2320    return create_context(dpy, xmvis,
2321                          shareCtx ? shareCtx->xmesaContext : NULL,
2322                          direct);
2323 }
2324
2325
2326 PUBLIC XVisualInfo *
2327 glXGetVisualFromFBConfigSGIX(Display *dpy, GLXFBConfigSGIX config)
2328 {
2329    return glXGetVisualFromFBConfig(dpy, config);
2330 }
2331
2332
2333 PUBLIC GLXFBConfigSGIX
2334 glXGetFBConfigFromVisualSGIX(Display *dpy, XVisualInfo *vis)
2335 {
2336    XMesaVisual xmvis = find_glx_visual(dpy, vis);
2337    if (!xmvis) {
2338       /* This visual wasn't found with glXChooseVisual() */
2339       xmvis = create_glx_visual(dpy, vis);
2340    }
2341
2342    return (GLXFBConfigSGIX) xmvis;
2343 }
2344
2345
2346
2347 /*** GLX_SGIX_pbuffer ***/
2348
2349 PUBLIC GLXPbufferSGIX
2350 glXCreateGLXPbufferSGIX(Display *dpy, GLXFBConfigSGIX config,
2351                         unsigned int width, unsigned int height,
2352                         int *attribList)
2353 {
2354    XMesaVisual xmvis = (XMesaVisual) config;
2355    XMesaBuffer xmbuf;
2356    const int *attrib;
2357    GLboolean useLargest = GL_FALSE, preserveContents = GL_FALSE;
2358
2359    (void) dpy;
2360
2361    for (attrib = attribList; attrib && *attrib; attrib++) {
2362       switch (*attrib) {
2363          case GLX_PRESERVED_CONTENTS_SGIX:
2364             attrib++;
2365             preserveContents = *attrib; /* ignored */
2366             break;
2367          case GLX_LARGEST_PBUFFER_SGIX:
2368             attrib++;
2369             useLargest = *attrib; /* ignored */
2370             break;
2371          default:
2372             return 0;
2373       }
2374    }
2375
2376    /* not used at this time */
2377    (void) useLargest;
2378    (void) preserveContents;
2379
2380    xmbuf = XMesaCreatePBuffer( xmvis, 0, width, height);
2381    /* A GLXPbuffer handle must be an X Drawable because that's what
2382     * glXMakeCurrent takes.
2383     */
2384    return (GLXPbuffer) xmbuf->drawable;
2385 }
2386
2387
2388 PUBLIC void
2389 glXDestroyGLXPbufferSGIX(Display *dpy, GLXPbufferSGIX pbuf)
2390 {
2391    XMesaBuffer xmbuf = XMesaFindBuffer(dpy, pbuf);
2392    if (xmbuf) {
2393       XMesaDestroyBuffer(xmbuf);
2394    }
2395 }
2396
2397
2398 PUBLIC int
2399 glXQueryGLXPbufferSGIX(Display *dpy, GLXPbufferSGIX pbuf, int attribute,
2400                        unsigned int *value)
2401 {
2402    const XMesaBuffer xmbuf = XMesaFindBuffer(dpy, pbuf);
2403
2404    if (!xmbuf) {
2405       /* Generate GLXBadPbufferSGIX for bad pbuffer */
2406       return 0;
2407    }
2408
2409    switch (attribute) {
2410       case GLX_PRESERVED_CONTENTS_SGIX:
2411          *value = True;
2412          break;
2413       case GLX_LARGEST_PBUFFER_SGIX:
2414          *value = xmesa_buffer_width(xmbuf) * xmesa_buffer_height(xmbuf);
2415          break;
2416       case GLX_WIDTH_SGIX:
2417          *value = xmesa_buffer_width(xmbuf);
2418          break;
2419       case GLX_HEIGHT_SGIX:
2420          *value = xmesa_buffer_height(xmbuf);
2421          break;
2422       case GLX_EVENT_MASK_SGIX:
2423          *value = 0;  /* XXX might be wrong */
2424          break;
2425       default:
2426          *value = 0;
2427    }
2428    return 0;
2429 }
2430
2431
2432 PUBLIC void
2433 glXSelectEventSGIX(Display *dpy, GLXDrawable drawable, unsigned long mask)
2434 {
2435    XMesaBuffer xmbuf = XMesaFindBuffer(dpy, drawable);
2436    if (xmbuf) {
2437       /* Note: we'll never generate clobber events */
2438       xmbuf->selectedEvents = mask;
2439    }
2440 }
2441
2442
2443 PUBLIC void
2444 glXGetSelectedEventSGIX(Display *dpy, GLXDrawable drawable,
2445                         unsigned long *mask)
2446 {
2447    XMesaBuffer xmbuf = XMesaFindBuffer(dpy, drawable);
2448    if (xmbuf) {
2449       *mask = xmbuf->selectedEvents;
2450    }
2451    else {
2452       *mask = 0;
2453    }
2454 }
2455
2456
2457
2458 /*** GLX_SGI_cushion ***/
2459
2460 PUBLIC void
2461 glXCushionSGI(Display *dpy, Window win, float cushion)
2462 {
2463    (void) dpy;
2464    (void) win;
2465    (void) cushion;
2466 }
2467
2468
2469
2470 /*** GLX_SGIX_video_resize ***/
2471
2472 PUBLIC int
2473 glXBindChannelToWindowSGIX(Display *dpy, int screen, int channel,
2474                            Window window)
2475 {
2476    (void) dpy;
2477    (void) screen;
2478    (void) channel;
2479    (void) window;
2480    return 0;
2481 }
2482
2483 PUBLIC int
2484 glXChannelRectSGIX(Display *dpy, int screen, int channel,
2485                    int x, int y, int w, int h)
2486 {
2487    (void) dpy;
2488    (void) screen;
2489    (void) channel;
2490    (void) x;
2491    (void) y;
2492    (void) w;
2493    (void) h;
2494    return 0;
2495 }
2496
2497 PUBLIC int
2498 glXQueryChannelRectSGIX(Display *dpy, int screen, int channel,
2499                         int *x, int *y, int *w, int *h)
2500 {
2501    (void) dpy;
2502    (void) screen;
2503    (void) channel;
2504    (void) x;
2505    (void) y;
2506    (void) w;
2507    (void) h;
2508    return 0;
2509 }
2510
2511 PUBLIC int
2512 glXQueryChannelDeltasSGIX(Display *dpy, int screen, int channel,
2513                           int *dx, int *dy, int *dw, int *dh)
2514 {
2515    (void) dpy;
2516    (void) screen;
2517    (void) channel;
2518    (void) dx;
2519    (void) dy;
2520    (void) dw;
2521    (void) dh;
2522    return 0;
2523 }
2524
2525 PUBLIC int
2526 glXChannelRectSyncSGIX(Display *dpy, int screen, int channel, GLenum synctype)
2527 {
2528    (void) dpy;
2529    (void) screen;
2530    (void) channel;
2531    (void) synctype;
2532    return 0;
2533 }
2534
2535
2536
2537 /*** GLX_SGIX_dmbuffer **/
2538
2539 #if defined(_DM_BUFFER_H_)
2540 PUBLIC Bool
2541 glXAssociateDMPbufferSGIX(Display *dpy, GLXPbufferSGIX pbuffer,
2542                           DMparams *params, DMbuffer dmbuffer)
2543 {
2544    (void) dpy;
2545    (void) pbuffer;
2546    (void) params;
2547    (void) dmbuffer;
2548    return False;
2549 }
2550 #endif
2551
2552
2553 /*** GLX_SGIX_swap_group ***/
2554
2555 PUBLIC void
2556 glXJoinSwapGroupSGIX(Display *dpy, GLXDrawable drawable, GLXDrawable member)
2557 {
2558    (void) dpy;
2559    (void) drawable;
2560    (void) member;
2561 }
2562
2563
2564
2565 /*** GLX_SGIX_swap_barrier ***/
2566
2567 PUBLIC void
2568 glXBindSwapBarrierSGIX(Display *dpy, GLXDrawable drawable, int barrier)
2569 {
2570    (void) dpy;
2571    (void) drawable;
2572    (void) barrier;
2573 }
2574
2575 PUBLIC Bool
2576 glXQueryMaxSwapBarriersSGIX(Display *dpy, int screen, int *max)
2577 {
2578    (void) dpy;
2579    (void) screen;
2580    (void) max;
2581    return False;
2582 }
2583
2584
2585
2586 /*** GLX_SUN_get_transparent_index ***/
2587
2588 PUBLIC Status
2589 glXGetTransparentIndexSUN(Display *dpy, Window overlay, Window underlay,
2590                           long *pTransparent)
2591 {
2592    (void) dpy;
2593    (void) overlay;
2594    (void) underlay;
2595    (void) pTransparent;
2596    return 0;
2597 }
2598
2599
2600
2601 /*** GLX_MESA_release_buffers ***/
2602
2603 /*
2604  * Release the depth, stencil, accum buffers attached to a GLXDrawable
2605  * (a window or pixmap) prior to destroying the GLXDrawable.
2606  */
2607 PUBLIC Bool
2608 glXReleaseBuffersMESA( Display *dpy, GLXDrawable d )
2609 {
2610    XMesaBuffer b = XMesaFindBuffer(dpy, d);
2611    if (b) {
2612       XMesaDestroyBuffer(b);
2613       return True;
2614    }
2615    return False;
2616 }
2617
2618 /*** GLX_EXT_texture_from_pixmap ***/
2619
2620 PUBLIC void
2621 glXBindTexImageEXT(Display *dpy, GLXDrawable drawable, int buffer,
2622                         const int *attrib_list)
2623 {
2624    XMesaBuffer b = XMesaFindBuffer(dpy, drawable);
2625    if (b)
2626       XMesaBindTexImage(dpy, b, buffer, attrib_list);
2627 }
2628
2629 PUBLIC void
2630 glXReleaseTexImageEXT(Display *dpy, GLXDrawable drawable, int buffer)
2631 {
2632    XMesaBuffer b = XMesaFindBuffer(dpy, drawable);
2633    if (b)
2634       XMesaReleaseTexImage(dpy, b, buffer);
2635 }