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       }
1762       return (GLXFBConfig *) results;
1763    }
1764    return NULL;
1765 }
1766
1767
1768 PUBLIC GLXFBConfig *
1769 glXChooseFBConfig( Display *dpy, int screen,
1770                         const int *attribList, int *nitems )
1771 {
1772    XMesaVisual xmvis;
1773
1774    if (!attribList || !attribList[0]) {
1775       /* return list of all configs (per GLX_SGIX_fbconfig spec) */
1776       return glXGetFBConfigs(dpy, screen, nitems);
1777    }
1778
1779    xmvis = choose_visual(dpy, screen, attribList, GL_TRUE);
1780    if (xmvis) {
1781       GLXFBConfig *config = (GLXFBConfig *) malloc(sizeof(XMesaVisual));
1782       if (!config) {
1783          *nitems = 0;
1784          return NULL;
1785       }
1786       *nitems = 1;
1787       config[0] = (GLXFBConfig) xmvis;
1788       return (GLXFBConfig *) config;
1789    }
1790    else {
1791       *nitems = 0;
1792       return NULL;
1793    }
1794 }
1795
1796
1797 PUBLIC XVisualInfo *
1798 glXGetVisualFromFBConfig( Display *dpy, GLXFBConfig config )
1799 {
1800    if (dpy && config) {
1801       XMesaVisual xmvis = (XMesaVisual) config;
1802 #if 0
1803       return xmvis->vishandle;
1804 #else
1805       /* create a new vishandle - the cached one may be stale */
1806       xmvis->vishandle = (XVisualInfo *) malloc(sizeof(XVisualInfo));
1807       if (xmvis->vishandle) {
1808          memcpy(xmvis->vishandle, xmvis->visinfo, sizeof(XVisualInfo));
1809       }
1810       return xmvis->vishandle;
1811 #endif
1812    }
1813    else {
1814       return NULL;
1815    }
1816 }
1817
1818
1819 PUBLIC GLXWindow
1820 glXCreateWindow( Display *dpy, GLXFBConfig config, Window win,
1821                       const int *attribList )
1822 {
1823    XMesaVisual xmvis = (XMesaVisual) config;
1824    XMesaBuffer xmbuf;
1825    if (!xmvis)
1826       return 0;
1827
1828    xmbuf = XMesaCreateWindowBuffer(xmvis, win);
1829    if (!xmbuf)
1830       return 0;
1831
1832    (void) dpy;
1833    (void) attribList;  /* Ignored in GLX 1.3 */
1834
1835    return win;  /* A hack for now */
1836 }
1837
1838
1839 PUBLIC void
1840 glXDestroyWindow( Display *dpy, GLXWindow window )
1841 {
1842    XMesaBuffer b = XMesaFindBuffer(dpy, (Drawable) window);
1843    if (b)
1844       XMesaDestroyBuffer(b);
1845    /* don't destroy X window */
1846 }
1847
1848
1849 /* XXX untested */
1850 PUBLIC GLXPixmap
1851 glXCreatePixmap( Display *dpy, GLXFBConfig config, Pixmap pixmap,
1852                       const int *attribList )
1853 {
1854    XMesaVisual v = (XMesaVisual) config;
1855    XMesaBuffer b;
1856    const int *attr;
1857    int target = 0, format = 0, mipmap = 0;
1858    int value;
1859
1860    if (!dpy || !config || !pixmap)
1861       return 0;
1862
1863    for (attr = attribList; attr && *attr; attr++) {
1864       switch (*attr) {
1865       case GLX_TEXTURE_FORMAT_EXT:
1866          attr++;
1867          switch (*attr) {
1868          case GLX_TEXTURE_FORMAT_NONE_EXT:
1869          case GLX_TEXTURE_FORMAT_RGB_EXT:
1870          case GLX_TEXTURE_FORMAT_RGBA_EXT:
1871             format = *attr;
1872             break;
1873          default:
1874             /* error */
1875             return 0;
1876          }
1877          break;
1878       case GLX_TEXTURE_TARGET_EXT:
1879          attr++;
1880          switch (*attr) {
1881          case GLX_TEXTURE_1D_EXT:
1882          case GLX_TEXTURE_2D_EXT:
1883          case GLX_TEXTURE_RECTANGLE_EXT:
1884             target = *attr;
1885             break;
1886          default:
1887             /* error */
1888             return 0;
1889          }
1890          break;
1891       case GLX_MIPMAP_TEXTURE_EXT:
1892          attr++;
1893          if (*attr)
1894             mipmap = 1;
1895          break;
1896       default:
1897          /* error */
1898          return 0;
1899       }
1900    }
1901
1902    if (format == GLX_TEXTURE_FORMAT_RGB_EXT) {
1903       if (get_config(v, GLX_BIND_TO_TEXTURE_RGB_EXT,
1904                      &value, GL_TRUE) != Success
1905           || !value) {
1906          return 0; /* error! */
1907       }
1908    }
1909    else if (format == GLX_TEXTURE_FORMAT_RGBA_EXT) {
1910       if (get_config(v, GLX_BIND_TO_TEXTURE_RGBA_EXT,
1911                      &value, GL_TRUE) != Success
1912           || !value) {
1913          return 0; /* error! */
1914       }
1915    }
1916    if (mipmap) {
1917       if (get_config(v, GLX_BIND_TO_MIPMAP_TEXTURE_EXT,
1918                      &value, GL_TRUE) != Success
1919           || !value) {
1920          return 0; /* error! */
1921       }
1922    }
1923    if (target == GLX_TEXTURE_1D_EXT) {
1924       if (get_config(v, GLX_BIND_TO_TEXTURE_TARGETS_EXT,
1925                      &value, GL_TRUE) != Success
1926           || (value & GLX_TEXTURE_1D_BIT_EXT) == 0) {
1927          return 0; /* error! */
1928       }
1929    }
1930    else if (target == GLX_TEXTURE_2D_EXT) {
1931       if (get_config(v, GLX_BIND_TO_TEXTURE_TARGETS_EXT,
1932                      &value, GL_TRUE) != Success
1933           || (value & GLX_TEXTURE_2D_BIT_EXT) == 0) {
1934          return 0; /* error! */
1935       }
1936    }
1937    if (target == GLX_TEXTURE_RECTANGLE_EXT) {
1938       if (get_config(v, GLX_BIND_TO_TEXTURE_TARGETS_EXT,
1939                      &value, GL_TRUE) != Success
1940           || (value & GLX_TEXTURE_RECTANGLE_BIT_EXT) == 0) {
1941          return 0; /* error! */
1942       }
1943    }
1944
1945    if (format || target || mipmap) {
1946       /* texture from pixmap */
1947       b = XMesaCreatePixmapTextureBuffer(v, pixmap, 0, format, target, mipmap);
1948    }
1949    else {
1950       b = XMesaCreatePixmapBuffer( v, pixmap, 0 );
1951    }
1952    if (!b) {
1953       return 0;
1954    }
1955
1956    return pixmap;
1957 }
1958
1959
1960 PUBLIC void
1961 glXDestroyPixmap( Display *dpy, GLXPixmap pixmap )
1962 {
1963    XMesaBuffer b = XMesaFindBuffer(dpy, (Drawable)pixmap);
1964    if (b)
1965       XMesaDestroyBuffer(b);
1966    /* don't destroy X pixmap */
1967 }
1968
1969
1970 PUBLIC GLXPbuffer
1971 glXCreatePbuffer( Display *dpy, GLXFBConfig config,
1972                        const int *attribList )
1973 {
1974    XMesaVisual xmvis = (XMesaVisual) config;
1975    XMesaBuffer xmbuf;
1976    const int *attrib;
1977    int width = 0, height = 0;
1978    GLboolean useLargest = GL_FALSE, preserveContents = GL_FALSE;
1979
1980    (void) dpy;
1981
1982    for (attrib = attribList; *attrib; attrib++) {
1983       switch (*attrib) {
1984          case GLX_PBUFFER_WIDTH:
1985             attrib++;
1986             width = *attrib;
1987             break;
1988          case GLX_PBUFFER_HEIGHT:
1989             attrib++;
1990             height = *attrib;
1991             break;
1992          case GLX_PRESERVED_CONTENTS:
1993             attrib++;
1994             preserveContents = *attrib;
1995             break;
1996          case GLX_LARGEST_PBUFFER:
1997             attrib++;
1998             useLargest = *attrib;
1999             break;
2000          default:
2001             return 0;
2002       }
2003    }
2004
2005    if (width == 0 || height == 0)
2006       return 0;
2007
2008    if (width > MAX_WIDTH || height > MAX_HEIGHT) {
2009       /* If allocation would have failed and GLX_LARGEST_PBUFFER is set,
2010        * allocate the largest possible buffer.
2011        */
2012       if (useLargest) {
2013          width = MAX_WIDTH;
2014          height = MAX_HEIGHT;
2015       }
2016    }
2017
2018    xmbuf = XMesaCreatePBuffer( xmvis, 0, width, height);
2019    /* A GLXPbuffer handle must be an X Drawable because that's what
2020     * glXMakeCurrent takes.
2021     */
2022    if (xmbuf) {
2023       xmbuf->largestPbuffer = useLargest;
2024       xmbuf->preservedContents = preserveContents;
2025       return (GLXPbuffer) xmbuf->drawable;
2026    }
2027    else {
2028       return 0;
2029    }
2030 }
2031
2032
2033 PUBLIC void
2034 glXDestroyPbuffer( Display *dpy, GLXPbuffer pbuf )
2035 {
2036    XMesaBuffer b = XMesaFindBuffer(dpy, pbuf);
2037    if (b) {
2038       XMesaDestroyBuffer(b);
2039    }
2040 }
2041
2042
2043 PUBLIC void
2044 glXQueryDrawable( Display *dpy, GLXDrawable draw, int attribute,
2045                        unsigned int *value )
2046 {
2047    GLuint width, height;
2048    XMesaBuffer xmbuf = XMesaFindBuffer(dpy, draw);
2049    if (!xmbuf)
2050       return;
2051
2052    /* make sure buffer's dimensions are up to date */
2053    xmesa_get_window_size(dpy, xmbuf, &width, &height);
2054
2055    switch (attribute) {
2056       case GLX_WIDTH:
2057          *value = width;
2058          break;
2059       case GLX_HEIGHT:
2060          *value = height;
2061          break;
2062       case GLX_PRESERVED_CONTENTS:
2063          *value = xmbuf->preservedContents;
2064          break;
2065       case GLX_LARGEST_PBUFFER:
2066          *value = xmbuf->largestPbuffer;
2067          break;
2068       case GLX_FBCONFIG_ID:
2069          *value = xmbuf->xm_visual->visinfo->visualid;
2070          return;
2071 #ifdef GLX_EXT_texture_from_pixmap
2072       case GLX_TEXTURE_FORMAT_EXT:
2073          *value = xmbuf->TextureFormat;
2074          break;
2075       case GLX_TEXTURE_TARGET_EXT:
2076          *value = xmbuf->TextureTarget;
2077          break;
2078       case GLX_MIPMAP_TEXTURE_EXT:
2079          *value = xmbuf->TextureMipmap;
2080          break;
2081 #endif
2082
2083       default:
2084          return; /* raise BadValue error */
2085    }
2086 }
2087
2088
2089 PUBLIC GLXContext
2090 glXCreateNewContext( Display *dpy, GLXFBConfig config,
2091                           int renderType, GLXContext shareList, Bool direct )
2092 {
2093    GLXContext glxCtx;
2094    GLXContext shareCtx = shareList;
2095    XMesaVisual xmvis = (XMesaVisual) config;
2096
2097    if (!dpy || !config ||
2098        (renderType != GLX_RGBA_TYPE && renderType != GLX_COLOR_INDEX_TYPE))
2099       return 0;
2100
2101    glxCtx = CALLOC_STRUCT(__GLXcontextRec);
2102    if (!glxCtx)
2103       return 0;
2104
2105    /* deallocate unused windows/buffers */
2106    XMesaGarbageCollect();
2107
2108    glxCtx->xmesaContext = XMesaCreateContext(xmvis,
2109                                    shareCtx ? shareCtx->xmesaContext : NULL);
2110    if (!glxCtx->xmesaContext) {
2111       free(glxCtx);
2112       return NULL;
2113    }
2114
2115    glxCtx->isDirect = DEFAULT_DIRECT;
2116    glxCtx->currentDpy = dpy;
2117    glxCtx->xid = (XID) glxCtx;  /* self pointer */
2118
2119    return glxCtx;
2120 }
2121
2122
2123 PUBLIC int
2124 glXQueryContext( Display *dpy, GLXContext ctx, int attribute, int *value )
2125 {
2126    GLXContext glxCtx = ctx;
2127    XMesaContext xmctx = glxCtx->xmesaContext;
2128
2129    (void) dpy;
2130    (void) ctx;
2131
2132    switch (attribute) {
2133    case GLX_FBCONFIG_ID:
2134       *value = xmctx->xm_visual->visinfo->visualid;
2135       break;
2136    case GLX_RENDER_TYPE:
2137       if (xmctx->xm_visual->mesa_visual.rgbMode)
2138          *value = GLX_RGBA_TYPE;
2139       else
2140          *value = GLX_COLOR_INDEX_TYPE;
2141       break;
2142    case GLX_SCREEN:
2143       *value = 0;
2144       return Success;
2145    default:
2146       return GLX_BAD_ATTRIBUTE;
2147    }
2148    return 0;
2149 }
2150
2151
2152 PUBLIC void
2153 glXSelectEvent( Display *dpy, GLXDrawable drawable, unsigned long mask )
2154 {
2155    XMesaBuffer xmbuf = XMesaFindBuffer(dpy, drawable);
2156    if (xmbuf)
2157       xmbuf->selectedEvents = mask;
2158 }
2159
2160
2161 PUBLIC void
2162 glXGetSelectedEvent( Display *dpy, GLXDrawable drawable,
2163                           unsigned long *mask )
2164 {
2165    XMesaBuffer xmbuf = XMesaFindBuffer(dpy, drawable);
2166    if (xmbuf)
2167       *mask = xmbuf->selectedEvents;
2168    else
2169       *mask = 0;
2170 }
2171
2172
2173
2174 /*** GLX_SGI_swap_control ***/
2175
2176 PUBLIC int
2177 glXSwapIntervalSGI(int interval)
2178 {
2179    (void) interval;
2180    return 0;
2181 }
2182
2183
2184
2185 /*** GLX_SGI_video_sync ***/
2186
2187 static unsigned int FrameCounter = 0;
2188
2189 PUBLIC int
2190 glXGetVideoSyncSGI(unsigned int *count)
2191 {
2192    /* this is a bogus implementation */
2193    *count = FrameCounter++;
2194    return 0;
2195 }
2196
2197 PUBLIC int
2198 glXWaitVideoSyncSGI(int divisor, int remainder, unsigned int *count)
2199 {
2200    if (divisor <= 0 || remainder < 0)
2201       return GLX_BAD_VALUE;
2202    /* this is a bogus implementation */
2203    FrameCounter++;
2204    while (FrameCounter % divisor != remainder)
2205       FrameCounter++;
2206    *count = FrameCounter;
2207    return 0;
2208 }
2209
2210
2211
2212 /*** GLX_SGI_make_current_read ***/
2213
2214 PUBLIC Bool
2215 glXMakeCurrentReadSGI(Display *dpy, GLXDrawable draw, GLXDrawable read, GLXContext ctx)
2216 {
2217    return glXMakeContextCurrent( dpy, draw, read, ctx );
2218 }
2219
2220 /* not used
2221 static GLXDrawable
2222 glXGetCurrentReadDrawableSGI(void)
2223 {
2224    return 0;
2225 }
2226 */
2227
2228
2229 /*** GLX_SGIX_video_source ***/
2230 #if defined(_VL_H)
2231
2232 PUBLIC GLXVideoSourceSGIX
2233 glXCreateGLXVideoSourceSGIX(Display *dpy, int screen, VLServer server, VLPath path, int nodeClass, VLNode drainNode)
2234 {
2235    (void) dpy;
2236    (void) screen;
2237    (void) server;
2238    (void) path;
2239    (void) nodeClass;
2240    (void) drainNode;
2241    return 0;
2242 }
2243
2244 PUBLIC void
2245 glXDestroyGLXVideoSourceSGIX(Display *dpy, GLXVideoSourceSGIX src)
2246 {
2247    (void) dpy;
2248    (void) src;
2249 }
2250
2251 #endif
2252
2253
2254 /*** GLX_EXT_import_context ***/
2255
2256 PUBLIC void
2257 glXFreeContextEXT(Display *dpy, GLXContext context)
2258 {
2259    (void) dpy;
2260    (void) context;
2261 }
2262
2263 PUBLIC GLXContextID
2264 glXGetContextIDEXT(const GLXContext context)
2265 {
2266    (void) context;
2267    return 0;
2268 }
2269
2270 PUBLIC GLXContext
2271 glXImportContextEXT(Display *dpy, GLXContextID contextID)
2272 {
2273    (void) dpy;
2274    (void) contextID;
2275    return 0;
2276 }
2277
2278 PUBLIC int
2279 glXQueryContextInfoEXT(Display *dpy, GLXContext context, int attribute, int *value)
2280 {
2281    (void) dpy;
2282    (void) context;
2283    (void) attribute;
2284    (void) value;
2285    return 0;
2286 }
2287
2288
2289
2290 /*** GLX_SGIX_fbconfig ***/
2291
2292 PUBLIC int
2293 glXGetFBConfigAttribSGIX(Display *dpy, GLXFBConfigSGIX config, int attribute, int *value)
2294 {
2295    return glXGetFBConfigAttrib(dpy, config, attribute, value);
2296 }
2297
2298 PUBLIC GLXFBConfigSGIX *
2299 glXChooseFBConfigSGIX(Display *dpy, int screen, int *attrib_list, int *nelements)
2300 {
2301    return (GLXFBConfig *) glXChooseFBConfig(dpy, screen, attrib_list, nelements);
2302 }
2303
2304
2305 PUBLIC GLXPixmap
2306 glXCreateGLXPixmapWithConfigSGIX(Display *dpy, GLXFBConfigSGIX config, Pixmap pixmap)
2307 {
2308    XMesaVisual xmvis = (XMesaVisual) config;
2309    XMesaBuffer xmbuf = XMesaCreatePixmapBuffer(xmvis, pixmap, 0);
2310    return xmbuf->drawable; /* need to return an X ID */
2311 }
2312
2313
2314 PUBLIC GLXContext
2315 glXCreateContextWithConfigSGIX(Display *dpy, GLXFBConfigSGIX config, int render_type, GLXContext share_list, Bool direct)
2316 {
2317    XMesaVisual xmvis = (XMesaVisual) config;
2318    GLXContext glxCtx;
2319    GLXContext shareCtx = share_list;
2320
2321    glxCtx = CALLOC_STRUCT(__GLXcontextRec);
2322    if (!glxCtx)
2323       return 0;
2324
2325    /* deallocate unused windows/buffers */
2326    XMesaGarbageCollect();
2327
2328    glxCtx->xmesaContext = XMesaCreateContext(xmvis,
2329                                    shareCtx ? shareCtx->xmesaContext : NULL);
2330    if (!glxCtx->xmesaContext) {
2331       free(glxCtx);
2332       return NULL;
2333    }
2334
2335    glxCtx->isDirect = DEFAULT_DIRECT;
2336    glxCtx->currentDpy = dpy;
2337    glxCtx->xid = (XID) glxCtx;  /* self pointer */
2338
2339    return glxCtx;
2340 }
2341
2342
2343 PUBLIC XVisualInfo *
2344 glXGetVisualFromFBConfigSGIX(Display *dpy, GLXFBConfigSGIX config)
2345 {
2346    return glXGetVisualFromFBConfig(dpy, config);
2347 }
2348
2349
2350 PUBLIC GLXFBConfigSGIX
2351 glXGetFBConfigFromVisualSGIX(Display *dpy, XVisualInfo *vis)
2352 {
2353    XMesaVisual xmvis = find_glx_visual(dpy, vis);
2354    if (!xmvis) {
2355       /* This visual wasn't found with glXChooseVisual() */
2356       xmvis = create_glx_visual(dpy, vis);
2357    }
2358
2359    return (GLXFBConfigSGIX) xmvis;
2360 }
2361
2362
2363
2364 /*** GLX_SGIX_pbuffer ***/
2365
2366 PUBLIC GLXPbufferSGIX
2367 glXCreateGLXPbufferSGIX(Display *dpy, GLXFBConfigSGIX config,
2368                              unsigned int width, unsigned int height,
2369                              int *attribList)
2370 {
2371    XMesaVisual xmvis = (XMesaVisual) config;
2372    XMesaBuffer xmbuf;
2373    const int *attrib;
2374    GLboolean useLargest = GL_FALSE, preserveContents = GL_FALSE;
2375
2376    (void) dpy;
2377
2378    for (attrib = attribList; attrib && *attrib; attrib++) {
2379       switch (*attrib) {
2380          case GLX_PRESERVED_CONTENTS_SGIX:
2381             attrib++;
2382             preserveContents = *attrib; /* ignored */
2383             break;
2384          case GLX_LARGEST_PBUFFER_SGIX:
2385             attrib++;
2386             useLargest = *attrib; /* ignored */
2387             break;
2388          default:
2389             return 0;
2390       }
2391    }
2392
2393    /* not used at this time */
2394    (void) useLargest;
2395    (void) preserveContents;
2396
2397    xmbuf = XMesaCreatePBuffer( xmvis, 0, width, height);
2398    /* A GLXPbuffer handle must be an X Drawable because that's what
2399     * glXMakeCurrent takes.
2400     */
2401    return (GLXPbuffer) xmbuf->drawable;
2402 }
2403
2404
2405 PUBLIC void
2406 glXDestroyGLXPbufferSGIX(Display *dpy, GLXPbufferSGIX pbuf)
2407 {
2408    XMesaBuffer xmbuf = XMesaFindBuffer(dpy, pbuf);
2409    if (xmbuf) {
2410       XMesaDestroyBuffer(xmbuf);
2411    }
2412 }
2413
2414
2415 PUBLIC int
2416 glXQueryGLXPbufferSGIX(Display *dpy, GLXPbufferSGIX pbuf, int attribute, unsigned int *value)
2417 {
2418    const XMesaBuffer xmbuf = XMesaFindBuffer(dpy, pbuf);
2419
2420    if (!xmbuf) {
2421       /* Generate GLXBadPbufferSGIX for bad pbuffer */
2422       return 0;
2423    }
2424
2425    switch (attribute) {
2426       case GLX_PRESERVED_CONTENTS_SGIX:
2427          *value = True;
2428          break;
2429       case GLX_LARGEST_PBUFFER_SGIX:
2430          *value = xmesa_buffer_width(xmbuf) * xmesa_buffer_height(xmbuf);
2431          break;
2432       case GLX_WIDTH_SGIX:
2433          *value = xmesa_buffer_width(xmbuf);
2434          break;
2435       case GLX_HEIGHT_SGIX:
2436          *value = xmesa_buffer_height(xmbuf);
2437          break;
2438       case GLX_EVENT_MASK_SGIX:
2439          *value = 0;  /* XXX might be wrong */
2440          break;
2441       default:
2442          *value = 0;
2443    }
2444    return 0;
2445 }
2446
2447
2448 PUBLIC void
2449 glXSelectEventSGIX(Display *dpy, GLXDrawable drawable, unsigned long mask)
2450 {
2451    XMesaBuffer xmbuf = XMesaFindBuffer(dpy, drawable);
2452    if (xmbuf) {
2453       /* Note: we'll never generate clobber events */
2454       xmbuf->selectedEvents = mask;
2455    }
2456 }
2457
2458
2459 PUBLIC void
2460 glXGetSelectedEventSGIX(Display *dpy, GLXDrawable drawable, unsigned long *mask)
2461 {
2462    XMesaBuffer xmbuf = XMesaFindBuffer(dpy, drawable);
2463    if (xmbuf) {
2464       *mask = xmbuf->selectedEvents;
2465    }
2466    else {
2467       *mask = 0;
2468    }
2469 }
2470
2471
2472
2473 /*** GLX_SGI_cushion ***/
2474
2475 PUBLIC void
2476 glXCushionSGI(Display *dpy, Window win, float cushion)
2477 {
2478    (void) dpy;
2479    (void) win;
2480    (void) cushion;
2481 }
2482
2483
2484
2485 /*** GLX_SGIX_video_resize ***/
2486
2487 PUBLIC int
2488 glXBindChannelToWindowSGIX(Display *dpy, int screen, int channel , Window window)
2489 {
2490    (void) dpy;
2491    (void) screen;
2492    (void) channel;
2493    (void) window;
2494    return 0;
2495 }
2496
2497 PUBLIC int
2498 glXChannelRectSGIX(Display *dpy, int screen, int channel, int x, int y, int w, int h)
2499 {
2500    (void) dpy;
2501    (void) screen;
2502    (void) channel;
2503    (void) x;
2504    (void) y;
2505    (void) w;
2506    (void) h;
2507    return 0;
2508 }
2509
2510 PUBLIC int
2511 glXQueryChannelRectSGIX(Display *dpy, int screen, int channel, int *x, int *y, int *w, int *h)
2512 {
2513    (void) dpy;
2514    (void) screen;
2515    (void) channel;
2516    (void) x;
2517    (void) y;
2518    (void) w;
2519    (void) h;
2520    return 0;
2521 }
2522
2523 PUBLIC int
2524 glXQueryChannelDeltasSGIX(Display *dpy, int screen, int channel, int *dx, int *dy, int *dw, int *dh)
2525 {
2526    (void) dpy;
2527    (void) screen;
2528    (void) channel;
2529    (void) dx;
2530    (void) dy;
2531    (void) dw;
2532    (void) dh;
2533    return 0;
2534 }
2535
2536 PUBLIC int
2537 glXChannelRectSyncSGIX(Display *dpy, int screen, int channel, GLenum synctype)
2538 {
2539    (void) dpy;
2540    (void) screen;
2541    (void) channel;
2542    (void) synctype;
2543    return 0;
2544 }
2545
2546
2547
2548 /*** GLX_SGIX_dmbuffer **/
2549
2550 #if defined(_DM_BUFFER_H_)
2551 PUBLIC Bool
2552 glXAssociateDMPbufferSGIX(Display *dpy, GLXPbufferSGIX pbuffer, DMparams *params, DMbuffer dmbuffer)
2553 {
2554    (void) dpy;
2555    (void) pbuffer;
2556    (void) params;
2557    (void) dmbuffer;
2558    return False;
2559 }
2560 #endif
2561
2562
2563 /*** GLX_SGIX_swap_group ***/
2564
2565 PUBLIC void
2566 glXJoinSwapGroupSGIX(Display *dpy, GLXDrawable drawable, GLXDrawable member)
2567 {
2568    (void) dpy;
2569    (void) drawable;
2570    (void) member;
2571 }
2572
2573
2574
2575 /*** GLX_SGIX_swap_barrier ***/
2576
2577 PUBLIC void
2578 glXBindSwapBarrierSGIX(Display *dpy, GLXDrawable drawable, int barrier)
2579 {
2580    (void) dpy;
2581    (void) drawable;
2582    (void) barrier;
2583 }
2584
2585 PUBLIC Bool
2586 glXQueryMaxSwapBarriersSGIX(Display *dpy, int screen, int *max)
2587 {
2588    (void) dpy;
2589    (void) screen;
2590    (void) max;
2591    return False;
2592 }
2593
2594
2595
2596 /*** GLX_SUN_get_transparent_index ***/
2597
2598 PUBLIC Status
2599 glXGetTransparentIndexSUN(Display *dpy, Window overlay, Window underlay, long *pTransparent)
2600 {
2601    (void) dpy;
2602    (void) overlay;
2603    (void) underlay;
2604    (void) pTransparent;
2605    return 0;
2606 }
2607
2608
2609
2610 /*** GLX_MESA_release_buffers ***/
2611
2612 /*
2613  * Release the depth, stencil, accum buffers attached to a GLXDrawable
2614  * (a window or pixmap) prior to destroying the GLXDrawable.
2615  */
2616 PUBLIC Bool
2617 glXReleaseBuffersMESA( Display *dpy, GLXDrawable d )
2618 {
2619    XMesaBuffer b = XMesaFindBuffer(dpy, d);
2620    if (b) {
2621       XMesaDestroyBuffer(b);
2622       return True;
2623    }
2624    return False;
2625 }
2626
2627 /*** GLX_EXT_texture_from_pixmap ***/
2628
2629 PUBLIC void
2630 glXBindTexImageEXT(Display *dpy, GLXDrawable drawable, int buffer,
2631                         const int *attrib_list)
2632 {
2633    XMesaBuffer b = XMesaFindBuffer(dpy, drawable);
2634    if (b)
2635       XMesaBindTexImage(dpy, b, buffer, attrib_list);
2636 }
2637
2638 PUBLIC void
2639 glXReleaseTexImageEXT(Display *dpy, GLXDrawable drawable, int buffer)
2640 {
2641    XMesaBuffer b = XMesaFindBuffer(dpy, drawable);
2642    if (b)
2643       XMesaReleaseTexImage(dpy, b, buffer);
2644 }