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