src/glx/x11/glxext.c

   1 /*
   2  * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
   3  * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice including the dates of first publication and
  13  * either this permission notice or a reference to
  14  * http://oss.sgi.com/projects/FreeB/
  15  * shall be included in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20  * SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  21  * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
  22  * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  23  * SOFTWARE.
  24  *
  25  * Except as contained in this notice, the name of Silicon Graphics, Inc.
  26  * shall not be used in advertising or otherwise to promote the sale, use or
  27  * other dealings in this Software without prior written authorization from
  28  * Silicon Graphics, Inc.
  29  */
  30
  31 /**
  32  * \file glxext.c
  33  * GLX protocol interface boot-strap code.
  34  *
  35  * Direct rendering support added by Precision Insight, Inc.
  36  *
  37  * \author Kevin E. Martin <kevin@precisioninsight.com>
  38  */
  39
  40 #include <assert.h>
  41 #include "glxclient.h"
  42 #include <X11/extensions/Xext.h>
  43 #include <X11/extensions/extutil.h>
  44 #include "glapi.h"
  45 #include "glxextensions.h"
  46 #include "glcontextmodes.h"
  47
  48 #ifdef USE_XCB
  49 #include <X11/Xlib-xcb.h>
  50 #include <xcb/xcb.h>
  51 #include <xcb/glx.h>
  52 #endif
  53
  54
  55 #ifdef DEBUG
  56 void __glXDumpDrawBuffer(__GLXcontext * ctx);
  57 #endif
  58
  59 /*
  60 ** You can set this cell to 1 to force the gl drawing stuff to be
  61 ** one command per packet
  62 */
  63 _X_HIDDEN int __glXDebug = 0;
  64
  65 /* Extension required boiler plate */
  66
  67 static char *__glXExtensionName = GLX_EXTENSION_NAME;
  68 XExtensionInfo *__glXExtensionInfo = NULL;
  69
  70 static /* const */ char *error_list[] = {
  71    "GLXBadContext",
  72    "GLXBadContextState",
  73    "GLXBadDrawable",
  74    "GLXBadPixmap",
  75    "GLXBadContextTag",
  76    "GLXBadCurrentWindow",
  77    "GLXBadRenderRequest",
  78    "GLXBadLargeRequest",
  79    "GLXUnsupportedPrivateRequest",
  80    "GLXBadFBConfig",
  81    "GLXBadPbuffer",
  82    "GLXBadCurrentDrawable",
  83    "GLXBadWindow",
  84 };
  85
  86 static int
  87 __glXCloseDisplay(Display * dpy, XExtCodes * codes)
  88 {
  89    GLXContext gc;
  90
  91    gc = __glXGetCurrentContext();
  92    if (dpy == gc->currentDpy) {
  93       __glXSetCurrentContextNull();
  94       __glXFreeContext(gc);
  95    }
  96
  97    return XextRemoveDisplay(__glXExtensionInfo, dpy);
  98 }
  99
 100
 101 static
 102 XEXT_GENERATE_ERROR_STRING(__glXErrorString, __glXExtensionName,
 103                            __GLX_NUMBER_ERRORS, error_list)
 104
 105      static /* const */ XExtensionHooks __glXExtensionHooks = {
 106         NULL,                   /* create_gc */
 107         NULL,                   /* copy_gc */
 108         NULL,                   /* flush_gc */
 109         NULL,                   /* free_gc */
 110         NULL,                   /* create_font */
 111         NULL,                   /* free_font */
 112         __glXCloseDisplay,      /* close_display */
 113         NULL,                   /* wire_to_event */
 114         NULL,                   /* event_to_wire */
 115         NULL,                   /* error */
 116         __glXErrorString,       /* error_string */
 117      };
 118
 119 static
 120 XEXT_GENERATE_FIND_DISPLAY(__glXFindDisplay, __glXExtensionInfo,
 121                            __glXExtensionName, &__glXExtensionHooks,
 122                            __GLX_NUMBER_EVENTS, NULL)
 123
 124 /************************************************************************/
 125 /*
 126 ** Free the per screen configs data as well as the array of
 127 ** __glXScreenConfigs.
 128 */
 129 static void
 130 FreeScreenConfigs(__GLXdisplayPrivate * priv)
 131 {
 132    __GLXscreenConfigs *psc;
 133    GLint i, screens;
 134
 135    /* Free screen configuration information */
 136    psc = priv->screenConfigs;
 137    screens = ScreenCount(priv->dpy);
 138    for (i = 0; i < screens; i++, psc++) {
 139       if (psc->configs) {
 140          _gl_context_modes_destroy(psc->configs);
 141          if (psc->effectiveGLXexts)
 142             Xfree(psc->effectiveGLXexts);
 143          psc->configs = NULL;   /* NOTE: just for paranoia */
 144       }
 145       if (psc->visuals) {
 146          _gl_context_modes_destroy(psc->visuals);
 147          psc->visuals = NULL;   /* NOTE: just for paranoia */
 148       }
 149       Xfree((char *) psc->serverGLXexts);
 150
 151 #ifdef GLX_DIRECT_RENDERING
 152       if (psc->driScreen) {
 153          psc->driScreen->destroyScreen(psc);
 154          __glxHashDestroy(psc->drawHash);
 155          XFree(psc->driScreen);
 156          psc->driScreen = NULL;
 157       }
 158 #endif
 159    }
 160    XFree((char *) priv->screenConfigs);
 161    priv->screenConfigs = NULL;
 162 }
 163
 164 /*
 165 ** Release the private memory referred to in a display private
 166 ** structure.  The caller will free the extension structure.
 167 */
 168 static int
 169 __glXFreeDisplayPrivate(XExtData * extension)
 170 {
 171    __GLXdisplayPrivate *priv;
 172
 173    priv = (__GLXdisplayPrivate *) extension->private_data;
 174    FreeScreenConfigs(priv);
 175    if (priv->serverGLXvendor) {
 176       Xfree((char *) priv->serverGLXvendor);
 177       priv->serverGLXvendor = 0x0;      /* to protect against double free's */
 178    }
 179    if (priv->serverGLXversion) {
 180       Xfree((char *) priv->serverGLXversion);
 181       priv->serverGLXversion = 0x0;     /* to protect against double free's */
 182    }
 183
 184 #ifdef GLX_DIRECT_RENDERING
 185    /* Free the direct rendering per display data */
 186    if (priv->driswDisplay)
 187       (*priv->driswDisplay->destroyDisplay) (priv->driswDisplay);
 188    priv->driswDisplay = NULL;
 189
 190    if (priv->driDisplay)
 191       (*priv->driDisplay->destroyDisplay) (priv->driDisplay);
 192    priv->driDisplay = NULL;
 193
 194    if (priv->dri2Display)
 195       (*priv->dri2Display->destroyDisplay) (priv->dri2Display);
 196    priv->dri2Display = NULL;
 197 #endif
 198
 199    Xfree((char *) priv);
 200    return 0;
 201 }
 202
 203 /************************************************************************/
 204
 205 /*
 206 ** Query the version of the GLX extension.  This procedure works even if
 207 ** the client extension is not completely set up.
 208 */
 209 static Bool
 210 QueryVersion(Display * dpy, int opcode, int *major, int *minor)
 211 {
 212 #ifdef USE_XCB
 213    xcb_connection_t *c = XGetXCBConnection(dpy);
 214    xcb_glx_query_version_reply_t* reply =
 215       xcb_glx_query_version_reply(c,
 216                                   xcb_glx_query_version(c,
 217                                                         GLX_MAJOR_VERSION,
 218                                                         GLX_MINOR_VERSION),
 219                                   NULL);
 220
 221    if(reply->major_version != GLX_MAJOR_VERSION)
 222    {
 223       free(reply);
 224       return GL_FALSE;
 225    }
 226    *major = reply->major_version;
 227    *minor = min(reply->minor_version, GLX_MINOR_VERSION);
 228    free(reply);
 229    return GL_TRUE;
 230 #else
 231    xGLXQueryVersionReq *req;
 232    xGLXQueryVersionReply reply;
 233
 234    /* Send the glXQueryVersion request */
 235    LockDisplay(dpy);
 236    GetReq(GLXQueryVersion, req);
 237    req->reqType = opcode;
 238    req->glxCode = X_GLXQueryVersion;
 239    req->majorVersion = GLX_MAJOR_VERSION;
 240    req->minorVersion = GLX_MINOR_VERSION;
 241    _XReply(dpy, (xReply *) & reply, 0, False);
 242    UnlockDisplay(dpy);
 243    SyncHandle();
 244
 245    if (reply.majorVersion != GLX_MAJOR_VERSION) {
 246       /*
 247        ** The server does not support the same major release as this
 248        ** client.
 249        */
 250       return GL_FALSE;
 251    }
 252    *major = reply.majorVersion;
 253    *minor = min(reply.minorVersion, GLX_MINOR_VERSION);
 254    return GL_TRUE;
 255 #endif /* USE_XCB */
 256 }
 257
 258
 259 _X_HIDDEN void
 260 __glXInitializeVisualConfigFromTags(__GLcontextModes * config, int count,
 261                                     const INT32 * bp, Bool tagged_only,
 262                                     Bool fbconfig_style_tags)
 263 {
 264    int i;
 265
 266    if (!tagged_only) {
 267       /* Copy in the first set of properties */
 268       config->visualID = *bp++;
 269
 270       config->visualType = _gl_convert_from_x_visual_type(*bp++);
 271
 272       config->rgbMode = *bp++;
 273
 274       config->redBits = *bp++;
 275       config->greenBits = *bp++;
 276       config->blueBits = *bp++;
 277       config->alphaBits = *bp++;
 278       config->accumRedBits = *bp++;
 279       config->accumGreenBits = *bp++;
 280       config->accumBlueBits = *bp++;
 281       config->accumAlphaBits = *bp++;
 282
 283       config->doubleBufferMode = *bp++;
 284       config->stereoMode = *bp++;
 285
 286       config->rgbBits = *bp++;
 287       config->depthBits = *bp++;
 288       config->stencilBits = *bp++;
 289       config->numAuxBuffers = *bp++;
 290       config->level = *bp++;
 291
 292       count -= __GLX_MIN_CONFIG_PROPS;
 293    }
 294
 295    /*
 296     ** Additional properties may be in a list at the end
 297     ** of the reply.  They are in pairs of property type
 298     ** and property value.
 299     */
 300
 301 #define FETCH_OR_SET(tag) \
 302     config-> tag = ( fbconfig_style_tags ) ? *bp++ : 1
 303
 304    for (i = 0; i < count; i += 2) {
 305       switch (*bp++) {
 306       case GLX_RGBA:
 307          FETCH_OR_SET(rgbMode);
 308          break;
 309       case GLX_BUFFER_SIZE:
 310          config->rgbBits = *bp++;
 311          break;
 312       case GLX_LEVEL:
 313          config->level = *bp++;
 314          break;
 315       case GLX_DOUBLEBUFFER:
 316          FETCH_OR_SET(doubleBufferMode);
 317          break;
 318       case GLX_STEREO:
 319          FETCH_OR_SET(stereoMode);
 320          break;
 321       case GLX_AUX_BUFFERS:
 322          config->numAuxBuffers = *bp++;
 323          break;
 324       case GLX_RED_SIZE:
 325          config->redBits = *bp++;
 326          break;
 327       case GLX_GREEN_SIZE:
 328          config->greenBits = *bp++;
 329          break;
 330       case GLX_BLUE_SIZE:
 331          config->blueBits = *bp++;
 332          break;
 333       case GLX_ALPHA_SIZE:
 334          config->alphaBits = *bp++;
 335          break;
 336       case GLX_DEPTH_SIZE:
 337          config->depthBits = *bp++;
 338          break;
 339       case GLX_STENCIL_SIZE:
 340          config->stencilBits = *bp++;
 341          break;
 342       case GLX_ACCUM_RED_SIZE:
 343          config->accumRedBits = *bp++;
 344          break;
 345       case GLX_ACCUM_GREEN_SIZE:
 346          config->accumGreenBits = *bp++;
 347          break;
 348       case GLX_ACCUM_BLUE_SIZE:
 349          config->accumBlueBits = *bp++;
 350          break;
 351       case GLX_ACCUM_ALPHA_SIZE:
 352          config->accumAlphaBits = *bp++;
 353          break;
 354       case GLX_VISUAL_CAVEAT_EXT:
 355          config->visualRating = *bp++;
 356          break;
 357       case GLX_X_VISUAL_TYPE:
 358          config->visualType = *bp++;
 359          break;
 360       case GLX_TRANSPARENT_TYPE:
 361          config->transparentPixel = *bp++;
 362          break;
 363       case GLX_TRANSPARENT_INDEX_VALUE:
 364          config->transparentIndex = *bp++;
 365          break;
 366       case GLX_TRANSPARENT_RED_VALUE:
 367          config->transparentRed = *bp++;
 368          break;
 369       case GLX_TRANSPARENT_GREEN_VALUE:
 370          config->transparentGreen = *bp++;
 371          break;
 372       case GLX_TRANSPARENT_BLUE_VALUE:
 373          config->transparentBlue = *bp++;
 374          break;
 375       case GLX_TRANSPARENT_ALPHA_VALUE:
 376          config->transparentAlpha = *bp++;
 377          break;
 378       case GLX_VISUAL_ID:
 379          config->visualID = *bp++;
 380          break;
 381       case GLX_DRAWABLE_TYPE:
 382          config->drawableType = *bp++;
 383          break;
 384       case GLX_RENDER_TYPE:
 385          config->renderType = *bp++;
 386          break;
 387       case GLX_X_RENDERABLE:
 388          config->xRenderable = *bp++;
 389          break;
 390       case GLX_FBCONFIG_ID:
 391          config->fbconfigID = *bp++;
 392          break;
 393       case GLX_MAX_PBUFFER_WIDTH:
 394          config->maxPbufferWidth = *bp++;
 395          break;
 396       case GLX_MAX_PBUFFER_HEIGHT:
 397          config->maxPbufferHeight = *bp++;
 398          break;
 399       case GLX_MAX_PBUFFER_PIXELS:
 400          config->maxPbufferPixels = *bp++;
 401          break;
 402       case GLX_OPTIMAL_PBUFFER_WIDTH_SGIX:
 403          config->optimalPbufferWidth = *bp++;
 404          break;
 405       case GLX_OPTIMAL_PBUFFER_HEIGHT_SGIX:
 406          config->optimalPbufferHeight = *bp++;
 407          break;
 408       case GLX_VISUAL_SELECT_GROUP_SGIX:
 409          config->visualSelectGroup = *bp++;
 410          break;
 411       case GLX_SWAP_METHOD_OML:
 412          config->swapMethod = *bp++;
 413          break;
 414       case GLX_SAMPLE_BUFFERS_SGIS:
 415          config->sampleBuffers = *bp++;
 416          break;
 417       case GLX_SAMPLES_SGIS:
 418          config->samples = *bp++;
 419          break;
 420       case GLX_BIND_TO_TEXTURE_RGB_EXT:
 421          config->bindToTextureRgb = *bp++;
 422          break;
 423       case GLX_BIND_TO_TEXTURE_RGBA_EXT:
 424          config->bindToTextureRgba = *bp++;
 425          break;
 426       case GLX_BIND_TO_MIPMAP_TEXTURE_EXT:
 427          config->bindToMipmapTexture = *bp++;
 428          break;
 429       case GLX_BIND_TO_TEXTURE_TARGETS_EXT:
 430          config->bindToTextureTargets = *bp++;
 431          break;
 432       case GLX_Y_INVERTED_EXT:
 433          config->yInverted = *bp++;
 434          break;
 435       case None:
 436          i = count;
 437          break;
 438       default:
 439          break;
 440       }
 441    }
 442
 443    config->renderType =
 444       (config->rgbMode) ? GLX_RGBA_BIT : GLX_COLOR_INDEX_BIT;
 445
 446    config->haveAccumBuffer = ((config->accumRedBits +
 447                                config->accumGreenBits +
 448                                config->accumBlueBits +
 449                                config->accumAlphaBits) > 0);
 450    config->haveDepthBuffer = (config->depthBits > 0);
 451    config->haveStencilBuffer = (config->stencilBits > 0);
 452 }
 453
 454 static __GLcontextModes *
 455 createConfigsFromProperties(Display * dpy, int nvisuals, int nprops,
 456                             int screen, GLboolean tagged_only)
 457 {
 458    INT32 buf[__GLX_TOTAL_CONFIG], *props;
 459    unsigned prop_size;
 460    __GLcontextModes *modes, *m;
 461    int i;
 462
 463    if (nprops == 0)
 464       return NULL;
 465
 466    /* FIXME: Is the __GLX_MIN_CONFIG_PROPS test correct for FBconfigs? */
 467
 468    /* Check number of properties */
 469    if (nprops < __GLX_MIN_CONFIG_PROPS || nprops > __GLX_MAX_CONFIG_PROPS)
 470       return NULL;
 471
 472    /* Allocate memory for our config structure */
 473    modes = _gl_context_modes_create(nvisuals, sizeof(__GLcontextModes));
 474    if (!modes)
 475       return NULL;
 476
 477    prop_size = nprops * __GLX_SIZE_INT32;
 478    if (prop_size <= sizeof(buf))
 479       props = buf;
 480    else
 481       props = Xmalloc(prop_size);
 482
 483    /* Read each config structure and convert it into our format */
 484    m = modes;
 485    for (i = 0; i < nvisuals; i++) {
 486       _XRead(dpy, (char *) props, prop_size);
 487       /* Older X servers don't send this so we default it here. */
 488       m->drawableType = GLX_WINDOW_BIT;
 489       __glXInitializeVisualConfigFromTags(m, nprops, props,
 490                                           tagged_only, GL_TRUE);
 491       m->screen = screen;
 492       m = m->next;
 493    }
 494
 495    if (props != buf)
 496       Xfree(props);
 497
 498    return modes;
 499 }
 500
 501 static GLboolean
 502 getVisualConfigs(Display * dpy, __GLXdisplayPrivate * priv, int screen)
 503 {
 504    xGLXGetVisualConfigsReq *req;
 505    __GLXscreenConfigs *psc;
 506    xGLXGetVisualConfigsReply reply;
 507
 508    LockDisplay(dpy);
 509
 510    psc = priv->screenConfigs + screen;
 511    psc->visuals = NULL;
 512    GetReq(GLXGetVisualConfigs, req);
 513    req->reqType = priv->majorOpcode;
 514    req->glxCode = X_GLXGetVisualConfigs;
 515    req->screen = screen;
 516
 517    if (!_XReply(dpy, (xReply *) & reply, 0, False))
 518       goto out;
 519
 520    psc->visuals = createConfigsFromProperties(dpy,
 521                                               reply.numVisuals,
 522                                               reply.numProps,
 523                                               screen, GL_FALSE);
 524
 525  out:
 526    UnlockDisplay(dpy);
 527    return psc->visuals != NULL;
 528 }
 529
 530 static GLboolean
 531 getFBConfigs(Display * dpy, __GLXdisplayPrivate * priv, int screen)
 532 {
 533    xGLXGetFBConfigsReq *fb_req;
 534    xGLXGetFBConfigsSGIXReq *sgi_req;
 535    xGLXVendorPrivateWithReplyReq *vpreq;
 536    xGLXGetFBConfigsReply reply;
 537    __GLXscreenConfigs *psc;
 538
 539    psc = priv->screenConfigs + screen;
 540    psc->serverGLXexts = __glXQueryServerString(dpy, priv->majorOpcode, screen, GLX_EXTENSIONS);
 541
 542    LockDisplay(dpy);
 543
 544    psc->configs = NULL;
 545    if (atof(priv->serverGLXversion) >= 1.3) {
 546       GetReq(GLXGetFBConfigs, fb_req);
 547       fb_req->reqType = priv->majorOpcode;
 548       fb_req->glxCode = X_GLXGetFBConfigs;
 549       fb_req->screen = screen;
 550    }
 551    else if (strstr(psc->serverGLXexts, "GLX_SGIX_fbconfig") != NULL) {
 552       GetReqExtra(GLXVendorPrivateWithReply,
 553                   sz_xGLXGetFBConfigsSGIXReq +
 554                   sz_xGLXVendorPrivateWithReplyReq, vpreq);
 555       sgi_req = (xGLXGetFBConfigsSGIXReq *) vpreq;
 556       sgi_req->reqType = priv->majorOpcode;
 557       sgi_req->glxCode = X_GLXVendorPrivateWithReply;
 558       sgi_req->vendorCode = X_GLXvop_GetFBConfigsSGIX;
 559       sgi_req->screen = screen;
 560    }
 561    else
 562       goto out;
 563
 564    if (!_XReply(dpy, (xReply *) & reply, 0, False))
 565       goto out;
 566
 567    psc->configs = createConfigsFromProperties(dpy,
 568                                               reply.numFBConfigs,
 569                                               reply.numAttribs * 2,
 570                                               screen, GL_TRUE);
 571
 572  out:
 573    UnlockDisplay(dpy);
 574    return psc->configs != NULL;
 575 }
 576
 577 /*
 578 ** Allocate the memory for the per screen configs for each screen.
 579 ** If that works then fetch the per screen configs data.
 580 */
 581 static Bool
 582 AllocAndFetchScreenConfigs(Display * dpy, __GLXdisplayPrivate * priv)
 583 {
 584    __GLXscreenConfigs *psc;
 585    GLint i, screens;
 586
 587    /*
 588     ** First allocate memory for the array of per screen configs.
 589     */
 590    screens = ScreenCount(dpy);
 591    psc = (__GLXscreenConfigs *) Xmalloc(screens * sizeof(__GLXscreenConfigs));
 592    if (!psc) {
 593       return GL_FALSE;
 594    }
 595    memset(psc, 0, screens * sizeof(__GLXscreenConfigs));
 596    priv->screenConfigs = psc;
 597
 598    priv->serverGLXversion = __glXQueryServerString(dpy, priv->majorOpcode, 0, GLX_VERSION);
 599    if (priv->serverGLXversion == NULL) {
 600       FreeScreenConfigs(priv);
 601       return GL_FALSE;
 602    }
 603
 604    for (i = 0; i < screens; i++, psc++) {
 605       getVisualConfigs(dpy, priv, i);
 606       getFBConfigs(dpy, priv, i);
 607
 608 #ifdef GLX_DIRECT_RENDERING
 609       psc->scr = i;
 610       psc->dpy = dpy;
 611       psc->drawHash = __glxHashCreate();
 612       if (psc->drawHash == NULL)
 613          continue;
 614
 615       if (priv->dri2Display)
 616          psc->driScreen = (*priv->dri2Display->createScreen) (psc, i, priv);
 617
 618       if (psc->driScreen == NULL && priv->driDisplay)
 619          psc->driScreen = (*priv->driDisplay->createScreen) (psc, i, priv);
 620
 621       if (psc->driScreen == NULL && priv->driswDisplay)
 622          psc->driScreen = (*priv->driswDisplay->createScreen) (psc, i, priv);
 623
 624       if (psc->driScreen == NULL) {
 625          __glxHashDestroy(psc->drawHash);
 626          psc->drawHash = NULL;
 627       }
 628 #endif
 629    }
 630    SyncHandle();
 631    return GL_TRUE;
 632 }
 633
 634 /*
 635 ** Initialize the client side extension code.
 636 */
 637 _X_HIDDEN __GLXdisplayPrivate *
 638 __glXInitialize(Display * dpy)
 639 {
 640    XExtDisplayInfo *info = __glXFindDisplay(dpy);
 641    XExtData **privList, *private, *found;
 642    __GLXdisplayPrivate *dpyPriv;
 643    XEDataObject dataObj;
 644    int major, minor;
 645 #ifdef GLX_DIRECT_RENDERING
 646    Bool glx_direct, glx_accel;
 647 #endif
 648
 649 #if defined(USE_XTHREADS)
 650    {
 651       static int firstCall = 1;
 652       if (firstCall) {
 653          /* initialize the GLX mutexes */
 654          xmutex_init(&__glXmutex);
 655          firstCall = 0;
 656       }
 657    }
 658 #endif
 659
 660    /* The one and only long long lock */
 661    __glXLock();
 662
 663    if (!XextHasExtension(info)) {
 664       /* No GLX extension supported by this server. Oh well. */
 665       __glXUnlock();
 666       XMissingExtension(dpy, __glXExtensionName);
 667       return 0;
 668    }
 669
 670    /* See if a display private already exists.  If so, return it */
 671    dataObj.display = dpy;
 672    privList = XEHeadOfExtensionList(dataObj);
 673    found = XFindOnExtensionList(privList, info->codes->extension);
 674    if (found) {
 675       __glXUnlock();
 676       return (__GLXdisplayPrivate *) found->private_data;
 677    }
 678
 679    /* See if the versions are compatible */
 680    if (!QueryVersion(dpy, info->codes->major_opcode, &major, &minor)) {
 681       /* The client and server do not agree on versions.  Punt. */
 682       __glXUnlock();
 683       return 0;
 684    }
 685
 686    /*
 687     ** Allocate memory for all the pieces needed for this buffer.
 688     */
 689    private = (XExtData *) Xmalloc(sizeof(XExtData));
 690    if (!private) {
 691       __glXUnlock();
 692       return 0;
 693    }
 694    dpyPriv = (__GLXdisplayPrivate *) Xcalloc(1, sizeof(__GLXdisplayPrivate));
 695    if (!dpyPriv) {
 696       __glXUnlock();
 697       Xfree((char *) private);
 698       return 0;
 699    }
 700
 701    /*
 702     ** Init the display private and then read in the screen config
 703     ** structures from the server.
 704     */
 705    dpyPriv->majorOpcode = info->codes->major_opcode;
 706    dpyPriv->majorVersion = major;
 707    dpyPriv->minorVersion = minor;
 708    dpyPriv->dpy = dpy;
 709
 710    dpyPriv->serverGLXvendor = 0x0;
 711    dpyPriv->serverGLXversion = 0x0;
 712
 713 #ifdef GLX_DIRECT_RENDERING
 714    glx_direct = (getenv("LIBGL_ALWAYS_INDIRECT") == NULL);
 715    glx_accel = (getenv("LIBGL_ALWAYS_SOFTWARE") == NULL);
 716
 717    /*
 718     ** Initialize the direct rendering per display data and functions.
 719     ** Note: This _must_ be done before calling any other DRI routines
 720     ** (e.g., those called in AllocAndFetchScreenConfigs).
 721     */
 722    if (glx_direct && glx_accel) {
 723       dpyPriv->dri2Display = dri2CreateDisplay(dpy);
 724       dpyPriv->driDisplay = driCreateDisplay(dpy);
 725    }
 726    if (glx_direct)
 727       dpyPriv->driswDisplay = driswCreateDisplay(dpy);
 728 #endif
 729
 730    if (!AllocAndFetchScreenConfigs(dpy, dpyPriv)) {
 731       __glXUnlock();
 732       Xfree((char *) dpyPriv);
 733       Xfree((char *) private);
 734       return 0;
 735    }
 736
 737    /*
 738     ** Fill in the private structure.  This is the actual structure that
 739     ** hangs off of the Display structure.  Our private structure is
 740     ** referred to by this structure.  Got that?
 741     */
 742    private->number = info->codes->extension;
 743    private->next = 0;
 744    private->free_private = __glXFreeDisplayPrivate;
 745    private->private_data = (char *) dpyPriv;
 746    XAddToExtensionList(privList, private);
 747
 748    if (dpyPriv->majorVersion == 1 && dpyPriv->minorVersion >= 1) {
 749       __glXClientInfo(dpy, dpyPriv->majorOpcode);
 750    }
 751    __glXUnlock();
 752
 753    return dpyPriv;
 754 }
 755
 756 /*
 757 ** Setup for sending a GLX command on dpy.  Make sure the extension is
 758 ** initialized.  Try to avoid calling __glXInitialize as its kinda slow.
 759 */
 760 _X_HIDDEN CARD8
 761 __glXSetupForCommand(Display * dpy)
 762 {
 763    GLXContext gc;
 764    __GLXdisplayPrivate *priv;
 765
 766    /* If this thread has a current context, flush its rendering commands */
 767    gc = __glXGetCurrentContext();
 768    if (gc->currentDpy) {
 769       /* Flush rendering buffer of the current context, if any */
 770       (void) __glXFlushRenderBuffer(gc, gc->pc);
 771
 772       if (gc->currentDpy == dpy) {
 773          /* Use opcode from gc because its right */
 774          return gc->majorOpcode;
 775       }
 776       else {
 777          /*
 778           ** Have to get info about argument dpy because it might be to
 779           ** a different server
 780           */
 781       }
 782    }
 783
 784    /* Forced to lookup extension via the slow initialize route */
 785    priv = __glXInitialize(dpy);
 786    if (!priv) {
 787       return 0;
 788    }
 789    return priv->majorOpcode;
 790 }
 791
 792 /**
 793  * Flush the drawing command transport buffer.
 794  *
 795  * \param ctx  Context whose transport buffer is to be flushed.
 796  * \param pc   Pointer to first unused buffer location.
 797  *
 798  * \todo
 799  * Modify this function to use \c ctx->pc instead of the explicit
 800  * \c pc parameter.
 801  */
 802 _X_HIDDEN GLubyte *
 803 __glXFlushRenderBuffer(__GLXcontext * ctx, GLubyte * pc)
 804 {
 805    Display *const dpy = ctx->currentDpy;
 806 #ifdef USE_XCB
 807    xcb_connection_t *c = XGetXCBConnection(dpy);
 808 #else
 809    xGLXRenderReq *req;
 810 #endif /* USE_XCB */
 811    const GLint size = pc - ctx->buf;
 812
 813    if ((dpy != NULL) && (size > 0)) {
 814 #ifdef USE_XCB
 815       xcb_glx_render(c, ctx->currentContextTag, size,
 816                      (const uint8_t *) ctx->buf);
 817 #else
 818       /* Send the entire buffer as an X request */
 819       LockDisplay(dpy);
 820       GetReq(GLXRender, req);
 821       req->reqType = ctx->majorOpcode;
 822       req->glxCode = X_GLXRender;
 823       req->contextTag = ctx->currentContextTag;
 824       req->length += (size + 3) >> 2;
 825       _XSend(dpy, (char *) ctx->buf, size);
 826       UnlockDisplay(dpy);
 827       SyncHandle();
 828 #endif
 829    }
 830
 831    /* Reset pointer and return it */
 832    ctx->pc = ctx->buf;
 833    return ctx->pc;
 834 }
 835
 836
 837 /**
 838  * Send a portion of a GLXRenderLarge command to the server.  The advantage of
 839  * this function over \c __glXSendLargeCommand is that callers can use the
 840  * data buffer in the GLX context and may be able to avoid allocating an
 841  * extra buffer.  The disadvantage is the clients will have to do more
 842  * GLX protocol work (i.e., calculating \c totalRequests, etc.).
 843  *
 844  * \sa __glXSendLargeCommand
 845  *
 846  * \param gc             GLX context
 847  * \param requestNumber  Which part of the whole command is this?  The first
 848  *                       request is 1.
 849  * \param totalRequests  How many requests will there be?
 850  * \param data           Command data.
 851  * \param dataLen        Size, in bytes, of the command data.
 852  */
 853 _X_HIDDEN void
 854 __glXSendLargeChunk(__GLXcontext * gc, GLint requestNumber,
 855                     GLint totalRequests, const GLvoid * data, GLint dataLen)
 856 {
 857    Display *dpy = gc->currentDpy;
 858 #ifdef USE_XCB
 859    xcb_connection_t *c = XGetXCBConnection(dpy);
 860    xcb_glx_render_large(c, gc->currentContextTag, requestNumber,
 861                         totalRequests, dataLen, data);
 862 #else
 863    xGLXRenderLargeReq *req;
 864
 865    if (requestNumber == 1) {
 866       LockDisplay(dpy);
 867    }
 868
 869    GetReq(GLXRenderLarge, req);
 870    req->reqType = gc->majorOpcode;
 871    req->glxCode = X_GLXRenderLarge;
 872    req->contextTag = gc->currentContextTag;
 873    req->length += (dataLen + 3) >> 2;
 874    req->requestNumber = requestNumber;
 875    req->requestTotal = totalRequests;
 876    req->dataBytes = dataLen;
 877    Data(dpy, data, dataLen);
 878
 879    if (requestNumber == totalRequests) {
 880       UnlockDisplay(dpy);
 881       SyncHandle();
 882    }
 883 #endif /* USE_XCB */
 884 }
 885
 886
 887 /**
 888  * Send a command that is too large for the GLXRender protocol request.
 889  *
 890  * Send a large command, one that is too large for some reason to
 891  * send using the GLXRender protocol request.  One reason to send
 892  * a large command is to avoid copying the data.
 893  *
 894  * \param ctx        GLX context
 895  * \param header     Header data.
 896  * \param headerLen  Size, in bytes, of the header data.  It is assumed that
 897  *                   the header data will always be small enough to fit in
 898  *                   a single X protocol packet.
 899  * \param data       Command data.
 900  * \param dataLen    Size, in bytes, of the command data.
 901  */
 902 _X_HIDDEN void
 903 __glXSendLargeCommand(__GLXcontext * ctx,
 904                       const GLvoid * header, GLint headerLen,
 905                       const GLvoid * data, GLint dataLen)
 906 {
 907    GLint maxSize;
 908    GLint totalRequests, requestNumber;
 909
 910    /*
 911     ** Calculate the maximum amount of data can be stuffed into a single
 912     ** packet.  sz_xGLXRenderReq is added because bufSize is the maximum
 913     ** packet size minus sz_xGLXRenderReq.
 914     */
 915    maxSize = (ctx->bufSize + sz_xGLXRenderReq) - sz_xGLXRenderLargeReq;
 916    totalRequests = 1 + (dataLen / maxSize);
 917    if (dataLen % maxSize)
 918       totalRequests++;
 919
 920    /*
 921     ** Send all of the command, except the large array, as one request.
 922     */
 923    assert(headerLen <= maxSize);
 924    __glXSendLargeChunk(ctx, 1, totalRequests, header, headerLen);
 925
 926    /*
 927     ** Send enough requests until the whole array is sent.
 928     */
 929    for (requestNumber = 2; requestNumber <= (totalRequests - 1);
 930         requestNumber++) {
 931       __glXSendLargeChunk(ctx, requestNumber, totalRequests, data, maxSize);
 932       data = (const GLvoid *) (((const GLubyte *) data) + maxSize);
 933       dataLen -= maxSize;
 934       assert(dataLen > 0);
 935    }
 936
 937    assert(dataLen <= maxSize);
 938    __glXSendLargeChunk(ctx, requestNumber, totalRequests, data, dataLen);
 939 }
 940
 941 /************************************************************************/
 942
 943 #ifdef DEBUG
 944 _X_HIDDEN void
 945 __glXDumpDrawBuffer(__GLXcontext * ctx)
 946 {
 947    GLubyte *p = ctx->buf;
 948    GLubyte *end = ctx->pc;
 949    GLushort opcode, length;
 950
 951    while (p < end) {
 952       /* Fetch opcode */
 953       opcode = *((GLushort *) p);
 954       length = *((GLushort *) (p + 2));
 955       printf("%2x: %5d: ", opcode, length);
 956       length -= 4;
 957       p += 4;
 958       while (length > 0) {
 959          printf("%08x ", *((unsigned *) p));
 960          p += 4;
 961          length -= 4;
 962       }
 963       printf("\n");
 964    }
 965 }
 966 #endif