src/glx/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 <X11/extensions/dri2proto.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 static Bool
 105 __glXWireToEvent(Display *dpy, XEvent *event, xEvent *wire);
 106 static Status
 107 __glXEventToWire(Display *dpy, XEvent *event, xEvent *wire);
 108
 109 static /* const */ XExtensionHooks __glXExtensionHooks = {
 110   NULL,                   /* create_gc */
 111   NULL,                   /* copy_gc */
 112   NULL,                   /* flush_gc */
 113   NULL,                   /* free_gc */
 114   NULL,                   /* create_font */
 115   NULL,                   /* free_font */
 116   __glXCloseDisplay,      /* close_display */
 117   __glXWireToEvent,       /* wire_to_event */
 118   __glXEventToWire,       /* event_to_wire */
 119   NULL,                   /* error */
 120   __glXErrorString,       /* error_string */
 121 };
 122
 123 XEXT_GENERATE_FIND_DISPLAY(__glXFindDisplay, __glXExtensionInfo,
 124                            __glXExtensionName, &__glXExtensionHooks,
 125                            __GLX_NUMBER_EVENTS, NULL)
 126
 127 /*
 128  * GLX events are a bit funky.  We don't stuff the X event code into
 129  * our user exposed (via XNextEvent) structure.  Instead we use the GLX
 130  * private event code namespace (and hope it doesn't conflict).  Clients
 131  * have to know that bit 15 in the event type field means they're getting
 132  * a GLX event, and then handle the various sub-event types there, rather
 133  * than simply checking the event code and handling it directly.
 134  */
 135
 136 static Bool
 137 __glXWireToEvent(Display *dpy, XEvent *event, xEvent *wire)
 138 {
 139    XExtDisplayInfo *info = __glXFindDisplay(dpy);
 140
 141    XextCheckExtension(dpy, info, __glXExtensionName, False);
 142
 143    switch ((wire->u.u.type & 0x7f) - info->codes->first_event) {
 144    case GLX_PbufferClobber:
 145    {
 146       GLXPbufferClobberEvent *aevent = (GLXPbufferClobberEvent *)event;
 147       xGLXPbufferClobberEvent *awire = (xGLXPbufferClobberEvent *)wire;
 148       aevent->event_type = awire->type;
 149       aevent->serial = awire->sequenceNumber;
 150       aevent->event_type = awire->event_type;
 151       aevent->draw_type = awire->draw_type;
 152       aevent->drawable = awire->drawable;
 153       aevent->buffer_mask = awire->buffer_mask;
 154       aevent->aux_buffer = awire->aux_buffer;
 155       aevent->x = awire->x;
 156       aevent->y = awire->y;
 157       aevent->width = awire->width;
 158       aevent->height = awire->height;
 159       aevent->count = awire->count;
 160       return True;
 161    }
 162    /* No easy symbol to test for this, as GLX_BufferSwapComplete is
 163     * defined in the local glx.h header, but the
 164     * xGLXBufferSwapComplete typedef is only available in new versions
 165     * of the external glxproto.h header, which doesn't have any
 166     * testable versioning define.
 167     *
 168     * I'll use the related DRI2 define, in the hope that we won't
 169     * receive these events unless we know how to ask for them:
 170     */
 171 #ifdef X_DRI2SwapBuffers
 172    case GLX_BufferSwapComplete:
 173    {
 174       GLXBufferSwapComplete *aevent = (GLXBufferSwapComplete *)event;
 175       xGLXBufferSwapComplete *awire = (xGLXBufferSwapComplete *)wire;
 176       aevent->event_type = awire->event_type;
 177       aevent->drawable = awire->drawable;
 178       aevent->ust = ((CARD64)awire->ust_hi << 32) | awire->ust_lo;
 179       aevent->msc = ((CARD64)awire->msc_hi << 32) | awire->msc_lo;
 180       aevent->sbc = ((CARD64)awire->sbc_hi << 32) | awire->sbc_lo;
 181       return True;
 182    }
 183 #endif
 184    default:
 185       /* client doesn't support server event */
 186       break;
 187    }
 188
 189    return False;
 190 }
 191
 192 /* We don't actually support this.  It doesn't make sense for clients to
 193  * send each other GLX events.
 194  */
 195 static Status
 196 __glXEventToWire(Display *dpy, XEvent *event, xEvent *wire)
 197 {
 198    XExtDisplayInfo *info = __glXFindDisplay(dpy);
 199
 200    XextCheckExtension(dpy, info, __glXExtensionName, False);
 201
 202    switch (event->type) {
 203    case GLX_DAMAGED:
 204       break;
 205    case GLX_SAVED:
 206       break;
 207    case GLX_EXCHANGE_COMPLETE_INTEL:
 208       break;
 209    case GLX_COPY_COMPLETE_INTEL:
 210       break;
 211    case GLX_FLIP_COMPLETE_INTEL:
 212       break;
 213    default:
 214       /* client doesn't support server event */
 215       break;
 216    }
 217
 218    return Success;
 219 }
 220
 221 /************************************************************************/
 222 /*
 223 ** Free the per screen configs data as well as the array of
 224 ** __glXScreenConfigs.
 225 */
 226 static void
 227 FreeScreenConfigs(__GLXdisplayPrivate * priv)
 228 {
 229    __GLXscreenConfigs *psc;
 230    GLint i, screens;
 231
 232    /* Free screen configuration information */
 233    psc = priv->screenConfigs;
 234    screens = ScreenCount(priv->dpy);
 235    for (i = 0; i < screens; i++, psc++) {
 236       if (psc->configs) {
 237          _gl_context_modes_destroy(psc->configs);
 238          if (psc->effectiveGLXexts)
 239             Xfree(psc->effectiveGLXexts);
 240          psc->configs = NULL;   /* NOTE: just for paranoia */
 241       }
 242       if (psc->visuals) {
 243          _gl_context_modes_destroy(psc->visuals);
 244          psc->visuals = NULL;   /* NOTE: just for paranoia */
 245       }
 246       Xfree((char *) psc->serverGLXexts);
 247
 248 #ifdef GLX_DIRECT_RENDERING
 249       if (psc->driver_configs) {
 250          unsigned int j;
 251          for (j = 0; psc->driver_configs[j]; j++)
 252             free((__DRIconfig *) psc->driver_configs[j]);
 253          free(psc->driver_configs);
 254          psc->driver_configs = NULL;
 255       }
 256       if (psc->driScreen) {
 257          psc->driScreen->destroyScreen(psc);
 258          __glxHashDestroy(psc->drawHash);
 259          XFree(psc->driScreen);
 260          psc->driScreen = NULL;
 261       }
 262 #endif
 263    }
 264    XFree((char *) priv->screenConfigs);
 265    priv->screenConfigs = NULL;
 266 }
 267
 268 /*
 269 ** Release the private memory referred to in a display private
 270 ** structure.  The caller will free the extension structure.
 271 */
 272 static int
 273 __glXFreeDisplayPrivate(XExtData * extension)
 274 {
 275    __GLXdisplayPrivate *priv;
 276
 277    priv = (__GLXdisplayPrivate *) extension->private_data;
 278    FreeScreenConfigs(priv);
 279    if (priv->serverGLXvendor) {
 280       Xfree((char *) priv->serverGLXvendor);
 281       priv->serverGLXvendor = 0x0;      /* to protect against double free's */
 282    }
 283    if (priv->serverGLXversion) {
 284       Xfree((char *) priv->serverGLXversion);
 285       priv->serverGLXversion = 0x0;     /* to protect against double free's */
 286    }
 287
 288 #ifdef GLX_DIRECT_RENDERING
 289    /* Free the direct rendering per display data */
 290    if (priv->driswDisplay)
 291       (*priv->driswDisplay->destroyDisplay) (priv->driswDisplay);
 292    priv->driswDisplay = NULL;
 293
 294    if (priv->driDisplay)
 295       (*priv->driDisplay->destroyDisplay) (priv->driDisplay);
 296    priv->driDisplay = NULL;
 297
 298    if (priv->dri2Display)
 299       (*priv->dri2Display->destroyDisplay) (priv->dri2Display);
 300    priv->dri2Display = NULL;
 301 #endif
 302
 303    Xfree((char *) priv);
 304    return 0;
 305 }
 306
 307 /************************************************************************/
 308
 309 /*
 310 ** Query the version of the GLX extension.  This procedure works even if
 311 ** the client extension is not completely set up.
 312 */
 313 static Bool
 314 QueryVersion(Display * dpy, int opcode, int *major, int *minor)
 315 {
 316 #ifdef USE_XCB
 317    xcb_connection_t *c = XGetXCBConnection(dpy);
 318    xcb_glx_query_version_reply_t *reply = xcb_glx_query_version_reply(c,
 319                                                                       xcb_glx_query_version
 320                                                                       (c,
 321                                                                        GLX_MAJOR_VERSION,
 322                                                                        GLX_MINOR_VERSION),
 323                                                                       NULL);
 324
 325    if (reply->major_version != GLX_MAJOR_VERSION) {
 326       free(reply);
 327       return GL_FALSE;
 328    }
 329    *major = reply->major_version;
 330    *minor = min(reply->minor_version, GLX_MINOR_VERSION);
 331    free(reply);
 332    return GL_TRUE;
 333 #else
 334    xGLXQueryVersionReq *req;
 335    xGLXQueryVersionReply reply;
 336
 337    /* Send the glXQueryVersion request */
 338    LockDisplay(dpy);
 339    GetReq(GLXQueryVersion, req);
 340    req->reqType = opcode;
 341    req->glxCode = X_GLXQueryVersion;
 342    req->majorVersion = GLX_MAJOR_VERSION;
 343    req->minorVersion = GLX_MINOR_VERSION;
 344    _XReply(dpy, (xReply *) & reply, 0, False);
 345    UnlockDisplay(dpy);
 346    SyncHandle();
 347
 348    if (reply.majorVersion != GLX_MAJOR_VERSION) {
 349       /*
 350        ** The server does not support the same major release as this
 351        ** client.
 352        */
 353       return GL_FALSE;
 354    }
 355    *major = reply.majorVersion;
 356    *minor = min(reply.minorVersion, GLX_MINOR_VERSION);
 357    return GL_TRUE;
 358 #endif /* USE_XCB */
 359 }
 360
 361
 362 _X_HIDDEN void
 363 __glXInitializeVisualConfigFromTags(__GLcontextModes * config, int count,
 364                                     const INT32 * bp, Bool tagged_only,
 365                                     Bool fbconfig_style_tags)
 366 {
 367    int i;
 368
 369    if (!tagged_only) {
 370       /* Copy in the first set of properties */
 371       config->visualID = *bp++;
 372
 373       config->visualType = _gl_convert_from_x_visual_type(*bp++);
 374
 375       config->rgbMode = *bp++;
 376
 377       config->redBits = *bp++;
 378       config->greenBits = *bp++;
 379       config->blueBits = *bp++;
 380       config->alphaBits = *bp++;
 381       config->accumRedBits = *bp++;
 382       config->accumGreenBits = *bp++;
 383       config->accumBlueBits = *bp++;
 384       config->accumAlphaBits = *bp++;
 385
 386       config->doubleBufferMode = *bp++;
 387       config->stereoMode = *bp++;
 388
 389       config->rgbBits = *bp++;
 390       config->depthBits = *bp++;
 391       config->stencilBits = *bp++;
 392       config->numAuxBuffers = *bp++;
 393       config->level = *bp++;
 394
 395       count -= __GLX_MIN_CONFIG_PROPS;
 396    }
 397
 398    /*
 399     ** Additional properties may be in a list at the end
 400     ** of the reply.  They are in pairs of property type
 401     ** and property value.
 402     */
 403
 404 #define FETCH_OR_SET(tag) \
 405     config-> tag = ( fbconfig_style_tags ) ? *bp++ : 1
 406
 407    for (i = 0; i < count; i += 2) {
 408       switch (*bp++) {
 409       case GLX_RGBA:
 410          FETCH_OR_SET(rgbMode);
 411          break;
 412       case GLX_BUFFER_SIZE:
 413          config->rgbBits = *bp++;
 414          break;
 415       case GLX_LEVEL:
 416          config->level = *bp++;
 417          break;
 418       case GLX_DOUBLEBUFFER:
 419          FETCH_OR_SET(doubleBufferMode);
 420          break;
 421       case GLX_STEREO:
 422          FETCH_OR_SET(stereoMode);
 423          break;
 424       case GLX_AUX_BUFFERS:
 425          config->numAuxBuffers = *bp++;
 426          break;
 427       case GLX_RED_SIZE:
 428          config->redBits = *bp++;
 429          break;
 430       case GLX_GREEN_SIZE:
 431          config->greenBits = *bp++;
 432          break;
 433       case GLX_BLUE_SIZE:
 434          config->blueBits = *bp++;
 435          break;
 436       case GLX_ALPHA_SIZE:
 437          config->alphaBits = *bp++;
 438          break;
 439       case GLX_DEPTH_SIZE:
 440          config->depthBits = *bp++;
 441          break;
 442       case GLX_STENCIL_SIZE:
 443          config->stencilBits = *bp++;
 444          break;
 445       case GLX_ACCUM_RED_SIZE:
 446          config->accumRedBits = *bp++;
 447          break;
 448       case GLX_ACCUM_GREEN_SIZE:
 449          config->accumGreenBits = *bp++;
 450          break;
 451       case GLX_ACCUM_BLUE_SIZE:
 452          config->accumBlueBits = *bp++;
 453          break;
 454       case GLX_ACCUM_ALPHA_SIZE:
 455          config->accumAlphaBits = *bp++;
 456          break;
 457       case GLX_VISUAL_CAVEAT_EXT:
 458          config->visualRating = *bp++;
 459          break;
 460       case GLX_X_VISUAL_TYPE:
 461          config->visualType = *bp++;
 462          break;
 463       case GLX_TRANSPARENT_TYPE:
 464          config->transparentPixel = *bp++;
 465          break;
 466       case GLX_TRANSPARENT_INDEX_VALUE:
 467          config->transparentIndex = *bp++;
 468          break;
 469       case GLX_TRANSPARENT_RED_VALUE:
 470          config->transparentRed = *bp++;
 471          break;
 472       case GLX_TRANSPARENT_GREEN_VALUE:
 473          config->transparentGreen = *bp++;
 474          break;
 475       case GLX_TRANSPARENT_BLUE_VALUE:
 476          config->transparentBlue = *bp++;
 477          break;
 478       case GLX_TRANSPARENT_ALPHA_VALUE:
 479          config->transparentAlpha = *bp++;
 480          break;
 481       case GLX_VISUAL_ID:
 482          config->visualID = *bp++;
 483          break;
 484       case GLX_DRAWABLE_TYPE:
 485          config->drawableType = *bp++;
 486          break;
 487       case GLX_RENDER_TYPE:
 488          config->renderType = *bp++;
 489          break;
 490       case GLX_X_RENDERABLE:
 491          config->xRenderable = *bp++;
 492          break;
 493       case GLX_FBCONFIG_ID:
 494          config->fbconfigID = *bp++;
 495          break;
 496       case GLX_MAX_PBUFFER_WIDTH:
 497          config->maxPbufferWidth = *bp++;
 498          break;
 499       case GLX_MAX_PBUFFER_HEIGHT:
 500          config->maxPbufferHeight = *bp++;
 501          break;
 502       case GLX_MAX_PBUFFER_PIXELS:
 503          config->maxPbufferPixels = *bp++;
 504          break;
 505       case GLX_OPTIMAL_PBUFFER_WIDTH_SGIX:
 506          config->optimalPbufferWidth = *bp++;
 507          break;
 508       case GLX_OPTIMAL_PBUFFER_HEIGHT_SGIX:
 509          config->optimalPbufferHeight = *bp++;
 510          break;
 511       case GLX_VISUAL_SELECT_GROUP_SGIX:
 512          config->visualSelectGroup = *bp++;
 513          break;
 514       case GLX_SWAP_METHOD_OML:
 515          config->swapMethod = *bp++;
 516          break;
 517       case GLX_SAMPLE_BUFFERS_SGIS:
 518          config->sampleBuffers = *bp++;
 519          break;
 520       case GLX_SAMPLES_SGIS:
 521          config->samples = *bp++;
 522          break;
 523       case GLX_BIND_TO_TEXTURE_RGB_EXT:
 524          config->bindToTextureRgb = *bp++;
 525          break;
 526       case GLX_BIND_TO_TEXTURE_RGBA_EXT:
 527          config->bindToTextureRgba = *bp++;
 528          break;
 529       case GLX_BIND_TO_MIPMAP_TEXTURE_EXT:
 530          config->bindToMipmapTexture = *bp++;
 531          break;
 532       case GLX_BIND_TO_TEXTURE_TARGETS_EXT:
 533          config->bindToTextureTargets = *bp++;
 534          break;
 535       case GLX_Y_INVERTED_EXT:
 536          config->yInverted = *bp++;
 537          break;
 538       case None:
 539          i = count;
 540          break;
 541       default:
 542          break;
 543       }
 544    }
 545
 546    config->renderType =
 547       (config->rgbMode) ? GLX_RGBA_BIT : GLX_COLOR_INDEX_BIT;
 548
 549    config->haveAccumBuffer = ((config->accumRedBits +
 550                                config->accumGreenBits +
 551                                config->accumBlueBits +
 552                                config->accumAlphaBits) > 0);
 553    config->haveDepthBuffer = (config->depthBits > 0);
 554    config->haveStencilBuffer = (config->stencilBits > 0);
 555 }
 556
 557 static __GLcontextModes *
 558 createConfigsFromProperties(Display * dpy, int nvisuals, int nprops,
 559                             int screen, GLboolean tagged_only)
 560 {
 561    INT32 buf[__GLX_TOTAL_CONFIG], *props;
 562    unsigned prop_size;
 563    __GLcontextModes *modes, *m;
 564    int i;
 565
 566    if (nprops == 0)
 567       return NULL;
 568
 569    /* FIXME: Is the __GLX_MIN_CONFIG_PROPS test correct for FBconfigs? */
 570
 571    /* Check number of properties */
 572    if (nprops < __GLX_MIN_CONFIG_PROPS || nprops > __GLX_MAX_CONFIG_PROPS)
 573       return NULL;
 574
 575    /* Allocate memory for our config structure */
 576    modes = _gl_context_modes_create(nvisuals, sizeof(__GLcontextModes));
 577    if (!modes)
 578       return NULL;
 579
 580    prop_size = nprops * __GLX_SIZE_INT32;
 581    if (prop_size <= sizeof(buf))
 582       props = buf;
 583    else
 584       props = Xmalloc(prop_size);
 585
 586    /* Read each config structure and convert it into our format */
 587    m = modes;
 588    for (i = 0; i < nvisuals; i++) {
 589       _XRead(dpy, (char *) props, prop_size);
 590       /* Older X servers don't send this so we default it here. */
 591       m->drawableType = GLX_WINDOW_BIT;
 592       __glXInitializeVisualConfigFromTags(m, nprops, props,
 593                                           tagged_only, GL_TRUE);
 594       m->screen = screen;
 595       m = m->next;
 596    }
 597
 598    if (props != buf)
 599       Xfree(props);
 600
 601    return modes;
 602 }
 603
 604 static GLboolean
 605 getVisualConfigs(Display * dpy, __GLXdisplayPrivate * priv, int screen)
 606 {
 607    xGLXGetVisualConfigsReq *req;
 608    __GLXscreenConfigs *psc;
 609    xGLXGetVisualConfigsReply reply;
 610
 611    LockDisplay(dpy);
 612
 613    psc = priv->screenConfigs + screen;
 614    psc->visuals = NULL;
 615    GetReq(GLXGetVisualConfigs, req);
 616    req->reqType = priv->majorOpcode;
 617    req->glxCode = X_GLXGetVisualConfigs;
 618    req->screen = screen;
 619
 620    if (!_XReply(dpy, (xReply *) & reply, 0, False))
 621       goto out;
 622
 623    psc->visuals = createConfigsFromProperties(dpy,
 624                                               reply.numVisuals,
 625                                               reply.numProps,
 626                                               screen, GL_FALSE);
 627
 628  out:
 629    UnlockDisplay(dpy);
 630    return psc->visuals != NULL;
 631 }
 632
 633 static GLboolean
 634 getFBConfigs(Display * dpy, __GLXdisplayPrivate * priv, int screen)
 635 {
 636    xGLXGetFBConfigsReq *fb_req;
 637    xGLXGetFBConfigsSGIXReq *sgi_req;
 638    xGLXVendorPrivateWithReplyReq *vpreq;
 639    xGLXGetFBConfigsReply reply;
 640    __GLXscreenConfigs *psc;
 641
 642    psc = priv->screenConfigs + screen;
 643    psc->serverGLXexts =
 644       __glXQueryServerString(dpy, priv->majorOpcode, screen, GLX_EXTENSIONS);
 645
 646    LockDisplay(dpy);
 647
 648    psc->configs = NULL;
 649    if (atof(priv->serverGLXversion) >= 1.3) {
 650       GetReq(GLXGetFBConfigs, fb_req);
 651       fb_req->reqType = priv->majorOpcode;
 652       fb_req->glxCode = X_GLXGetFBConfigs;
 653       fb_req->screen = screen;
 654    }
 655    else if (strstr(psc->serverGLXexts, "GLX_SGIX_fbconfig") != NULL) {
 656       GetReqExtra(GLXVendorPrivateWithReply,
 657                   sz_xGLXGetFBConfigsSGIXReq +
 658                   sz_xGLXVendorPrivateWithReplyReq, vpreq);
 659       sgi_req = (xGLXGetFBConfigsSGIXReq *) vpreq;
 660       sgi_req->reqType = priv->majorOpcode;
 661       sgi_req->glxCode = X_GLXVendorPrivateWithReply;
 662       sgi_req->vendorCode = X_GLXvop_GetFBConfigsSGIX;
 663       sgi_req->screen = screen;
 664    }
 665    else
 666       goto out;
 667
 668    if (!_XReply(dpy, (xReply *) & reply, 0, False))
 669       goto out;
 670
 671    psc->configs = createConfigsFromProperties(dpy,
 672                                               reply.numFBConfigs,
 673                                               reply.numAttribs * 2,
 674                                               screen, GL_TRUE);
 675
 676  out:
 677    UnlockDisplay(dpy);
 678    return psc->configs != NULL;
 679 }
 680
 681 /*
 682 ** Allocate the memory for the per screen configs for each screen.
 683 ** If that works then fetch the per screen configs data.
 684 */
 685 static Bool
 686 AllocAndFetchScreenConfigs(Display * dpy, __GLXdisplayPrivate * priv)
 687 {
 688    __GLXscreenConfigs *psc;
 689    GLint i, screens;
 690
 691    /*
 692     ** First allocate memory for the array of per screen configs.
 693     */
 694    screens = ScreenCount(dpy);
 695    psc = (__GLXscreenConfigs *) Xmalloc(screens * sizeof(__GLXscreenConfigs));
 696    if (!psc) {
 697       return GL_FALSE;
 698    }
 699    memset(psc, 0, screens * sizeof(__GLXscreenConfigs));
 700    priv->screenConfigs = psc;
 701
 702    priv->serverGLXversion =
 703       __glXQueryServerString(dpy, priv->majorOpcode, 0, GLX_VERSION);
 704    if (priv->serverGLXversion == NULL) {
 705       FreeScreenConfigs(priv);
 706       return GL_FALSE;
 707    }
 708
 709    for (i = 0; i < screens; i++, psc++) {
 710       getVisualConfigs(dpy, priv, i);
 711       getFBConfigs(dpy, priv, i);
 712
 713 #ifdef GLX_DIRECT_RENDERING
 714       psc->scr = i;
 715       psc->dpy = dpy;
 716       psc->drawHash = __glxHashCreate();
 717       if (psc->drawHash == NULL)
 718          continue;
 719
 720       /* Initialize per screen dynamic client GLX extensions */
 721       psc->ext_list_first_time = GL_TRUE;
 722
 723       if (priv->dri2Display)
 724          psc->driScreen = (*priv->dri2Display->createScreen) (psc, i, priv);
 725
 726       if (psc->driScreen == NULL && priv->driDisplay)
 727          psc->driScreen = (*priv->driDisplay->createScreen) (psc, i, priv);
 728
 729       if (psc->driScreen == NULL && priv->driswDisplay)
 730          psc->driScreen = (*priv->driswDisplay->createScreen) (psc, i, priv);
 731
 732       if (psc->driScreen == NULL) {
 733          __glxHashDestroy(psc->drawHash);
 734          psc->drawHash = NULL;
 735       }
 736 #endif
 737    }
 738    SyncHandle();
 739    return GL_TRUE;
 740 }
 741
 742 /*
 743 ** Initialize the client side extension code.
 744 */
 745 _X_HIDDEN __GLXdisplayPrivate *
 746 __glXInitialize(Display * dpy)
 747 {
 748    XExtDisplayInfo *info = __glXFindDisplay(dpy);
 749    XExtData **privList, *private, *found;
 750    __GLXdisplayPrivate *dpyPriv;
 751    XEDataObject dataObj;
 752    int major, minor;
 753 #ifdef GLX_DIRECT_RENDERING
 754    Bool glx_direct, glx_accel;
 755 #endif
 756
 757    /* The one and only long long lock */
 758    __glXLock();
 759
 760    if (!XextHasExtension(info)) {
 761       /* No GLX extension supported by this server. Oh well. */
 762       __glXUnlock();
 763       XMissingExtension(dpy, __glXExtensionName);
 764       return 0;
 765    }
 766
 767    /* See if a display private already exists.  If so, return it */
 768    dataObj.display = dpy;
 769    privList = XEHeadOfExtensionList(dataObj);
 770    found = XFindOnExtensionList(privList, info->codes->extension);
 771    if (found) {
 772       __glXUnlock();
 773       return (__GLXdisplayPrivate *) found->private_data;
 774    }
 775
 776    /* See if the versions are compatible */
 777    if (!QueryVersion(dpy, info->codes->major_opcode, &major, &minor)) {
 778       /* The client and server do not agree on versions.  Punt. */
 779       __glXUnlock();
 780       return 0;
 781    }
 782
 783    /*
 784     ** Allocate memory for all the pieces needed for this buffer.
 785     */
 786    private = (XExtData *) Xmalloc(sizeof(XExtData));
 787    if (!private) {
 788       __glXUnlock();
 789       return 0;
 790    }
 791    dpyPriv = (__GLXdisplayPrivate *) Xcalloc(1, sizeof(__GLXdisplayPrivate));
 792    if (!dpyPriv) {
 793       __glXUnlock();
 794       Xfree((char *) private);
 795       return 0;
 796    }
 797
 798    /*
 799     ** Init the display private and then read in the screen config
 800     ** structures from the server.
 801     */
 802    dpyPriv->majorOpcode = info->codes->major_opcode;
 803    dpyPriv->majorVersion = major;
 804    dpyPriv->minorVersion = minor;
 805    dpyPriv->dpy = dpy;
 806
 807    dpyPriv->serverGLXvendor = 0x0;
 808    dpyPriv->serverGLXversion = 0x0;
 809
 810 #ifdef GLX_DIRECT_RENDERING
 811    glx_direct = (getenv("LIBGL_ALWAYS_INDIRECT") == NULL);
 812    glx_accel = (getenv("LIBGL_ALWAYS_SOFTWARE") == NULL);
 813
 814    /*
 815     ** Initialize the direct rendering per display data and functions.
 816     ** Note: This _must_ be done before calling any other DRI routines
 817     ** (e.g., those called in AllocAndFetchScreenConfigs).
 818     */
 819    if (glx_direct && glx_accel) {
 820       dpyPriv->dri2Display = dri2CreateDisplay(dpy);
 821       dpyPriv->driDisplay = driCreateDisplay(dpy);
 822    }
 823    if (glx_direct)
 824       dpyPriv->driswDisplay = driswCreateDisplay(dpy);
 825 #endif
 826
 827    if (!AllocAndFetchScreenConfigs(dpy, dpyPriv)) {
 828       __glXUnlock();
 829       Xfree((char *) dpyPriv);
 830       Xfree((char *) private);
 831       return 0;
 832    }
 833
 834    /*
 835     ** Fill in the private structure.  This is the actual structure that
 836     ** hangs off of the Display structure.  Our private structure is
 837     ** referred to by this structure.  Got that?
 838     */
 839    private->number = info->codes->extension;
 840    private->next = 0;
 841    private->free_private = __glXFreeDisplayPrivate;
 842    private->private_data = (char *) dpyPriv;
 843    XAddToExtensionList(privList, private);
 844
 845    if (dpyPriv->majorVersion == 1 && dpyPriv->minorVersion >= 1) {
 846       __glXClientInfo(dpy, dpyPriv->majorOpcode);
 847    }
 848    __glXUnlock();
 849
 850    return dpyPriv;
 851 }
 852
 853 /*
 854 ** Setup for sending a GLX command on dpy.  Make sure the extension is
 855 ** initialized.  Try to avoid calling __glXInitialize as its kinda slow.
 856 */
 857 _X_HIDDEN CARD8
 858 __glXSetupForCommand(Display * dpy)
 859 {
 860    GLXContext gc;
 861    __GLXdisplayPrivate *priv;
 862
 863    /* If this thread has a current context, flush its rendering commands */
 864    gc = __glXGetCurrentContext();
 865    if (gc->currentDpy) {
 866       /* Flush rendering buffer of the current context, if any */
 867       (void) __glXFlushRenderBuffer(gc, gc->pc);
 868
 869       if (gc->currentDpy == dpy) {
 870          /* Use opcode from gc because its right */
 871          return gc->majorOpcode;
 872       }
 873       else {
 874          /*
 875           ** Have to get info about argument dpy because it might be to
 876           ** a different server
 877           */
 878       }
 879    }
 880
 881    /* Forced to lookup extension via the slow initialize route */
 882    priv = __glXInitialize(dpy);
 883    if (!priv) {
 884       return 0;
 885    }
 886    return priv->majorOpcode;
 887 }
 888
 889 /**
 890  * Flush the drawing command transport buffer.
 891  *
 892  * \param ctx  Context whose transport buffer is to be flushed.
 893  * \param pc   Pointer to first unused buffer location.
 894  *
 895  * \todo
 896  * Modify this function to use \c ctx->pc instead of the explicit
 897  * \c pc parameter.
 898  */
 899 _X_HIDDEN GLubyte *
 900 __glXFlushRenderBuffer(__GLXcontext * ctx, GLubyte * pc)
 901 {
 902    Display *const dpy = ctx->currentDpy;
 903 #ifdef USE_XCB
 904    xcb_connection_t *c = XGetXCBConnection(dpy);
 905 #else
 906    xGLXRenderReq *req;
 907 #endif /* USE_XCB */
 908    const GLint size = pc - ctx->buf;
 909
 910    if ((dpy != NULL) && (size > 0)) {
 911 #ifdef USE_XCB
 912       xcb_glx_render(c, ctx->currentContextTag, size,
 913                      (const uint8_t *) ctx->buf);
 914 #else
 915       /* Send the entire buffer as an X request */
 916       LockDisplay(dpy);
 917       GetReq(GLXRender, req);
 918       req->reqType = ctx->majorOpcode;
 919       req->glxCode = X_GLXRender;
 920       req->contextTag = ctx->currentContextTag;
 921       req->length += (size + 3) >> 2;
 922       _XSend(dpy, (char *) ctx->buf, size);
 923       UnlockDisplay(dpy);
 924       SyncHandle();
 925 #endif
 926    }
 927
 928    /* Reset pointer and return it */
 929    ctx->pc = ctx->buf;
 930    return ctx->pc;
 931 }
 932
 933
 934 /**
 935  * Send a portion of a GLXRenderLarge command to the server.  The advantage of
 936  * this function over \c __glXSendLargeCommand is that callers can use the
 937  * data buffer in the GLX context and may be able to avoid allocating an
 938  * extra buffer.  The disadvantage is the clients will have to do more
 939  * GLX protocol work (i.e., calculating \c totalRequests, etc.).
 940  *
 941  * \sa __glXSendLargeCommand
 942  *
 943  * \param gc             GLX context
 944  * \param requestNumber  Which part of the whole command is this?  The first
 945  *                       request is 1.
 946  * \param totalRequests  How many requests will there be?
 947  * \param data           Command data.
 948  * \param dataLen        Size, in bytes, of the command data.
 949  */
 950 _X_HIDDEN void
 951 __glXSendLargeChunk(__GLXcontext * gc, GLint requestNumber,
 952                     GLint totalRequests, const GLvoid * data, GLint dataLen)
 953 {
 954    Display *dpy = gc->currentDpy;
 955 #ifdef USE_XCB
 956    xcb_connection_t *c = XGetXCBConnection(dpy);
 957    xcb_glx_render_large(c, gc->currentContextTag, requestNumber,
 958                         totalRequests, dataLen, data);
 959 #else
 960    xGLXRenderLargeReq *req;
 961
 962    if (requestNumber == 1) {
 963       LockDisplay(dpy);
 964    }
 965
 966    GetReq(GLXRenderLarge, req);
 967    req->reqType = gc->majorOpcode;
 968    req->glxCode = X_GLXRenderLarge;
 969    req->contextTag = gc->currentContextTag;
 970    req->length += (dataLen + 3) >> 2;
 971    req->requestNumber = requestNumber;
 972    req->requestTotal = totalRequests;
 973    req->dataBytes = dataLen;
 974    Data(dpy, data, dataLen);
 975
 976    if (requestNumber == totalRequests) {
 977       UnlockDisplay(dpy);
 978       SyncHandle();
 979    }
 980 #endif /* USE_XCB */
 981 }
 982
 983
 984 /**
 985  * Send a command that is too large for the GLXRender protocol request.
 986  *
 987  * Send a large command, one that is too large for some reason to
 988  * send using the GLXRender protocol request.  One reason to send
 989  * a large command is to avoid copying the data.
 990  *
 991  * \param ctx        GLX context
 992  * \param header     Header data.
 993  * \param headerLen  Size, in bytes, of the header data.  It is assumed that
 994  *                   the header data will always be small enough to fit in
 995  *                   a single X protocol packet.
 996  * \param data       Command data.
 997  * \param dataLen    Size, in bytes, of the command data.
 998  */
 999 _X_HIDDEN void
1000 __glXSendLargeCommand(__GLXcontext * ctx,
1001                       const GLvoid * header, GLint headerLen,
1002                       const GLvoid * data, GLint dataLen)
1003 {
1004    GLint maxSize;
1005    GLint totalRequests, requestNumber;
1006
1007    /*
1008     ** Calculate the maximum amount of data can be stuffed into a single
1009     ** packet.  sz_xGLXRenderReq is added because bufSize is the maximum
1010     ** packet size minus sz_xGLXRenderReq.
1011     */
1012    maxSize = (ctx->bufSize + sz_xGLXRenderReq) - sz_xGLXRenderLargeReq;
1013    totalRequests = 1 + (dataLen / maxSize);
1014    if (dataLen % maxSize)
1015       totalRequests++;
1016
1017    /*
1018     ** Send all of the command, except the large array, as one request.
1019     */
1020    assert(headerLen <= maxSize);
1021    __glXSendLargeChunk(ctx, 1, totalRequests, header, headerLen);
1022
1023    /*
1024     ** Send enough requests until the whole array is sent.
1025     */
1026    for (requestNumber = 2; requestNumber <= (totalRequests - 1);
1027         requestNumber++) {
1028       __glXSendLargeChunk(ctx, requestNumber, totalRequests, data, maxSize);
1029       data = (const GLvoid *) (((const GLubyte *) data) + maxSize);
1030       dataLen -= maxSize;
1031       assert(dataLen > 0);
1032    }
1033
1034    assert(dataLen <= maxSize);
1035    __glXSendLargeChunk(ctx, requestNumber, totalRequests, data, dataLen);
1036 }
1037
1038 /************************************************************************/
1039
1040 #ifdef DEBUG
1041 _X_HIDDEN void
1042 __glXDumpDrawBuffer(__GLXcontext * ctx)
1043 {
1044    GLubyte *p = ctx->buf;
1045    GLubyte *end = ctx->pc;
1046    GLushort opcode, length;
1047
1048    while (p < end) {
1049       /* Fetch opcode */
1050       opcode = *((GLushort *) p);
1051       length = *((GLushort *) (p + 2));
1052       printf("%2x: %5d: ", opcode, length);
1053       length -= 4;
1054       p += 4;
1055       while (length > 0) {
1056          printf("%08x ", *((unsigned *) p));
1057          p += 4;
1058          length -= 4;
1059       }
1060       printf("\n");
1061    }
1062 }
1063 #endif