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