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

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