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

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