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 <stdbool.h>
  42
  43 #include "glxclient.h"
  44 #include <X11/extensions/Xext.h>
  45 #include <X11/extensions/extutil.h>
  46 #ifdef GLX_USE_APPLEGL
  47 #include "apple/apple_glx.h"
  48 #include "apple/apple_visual.h"
  49 #endif
  50 #include "glxextensions.h"
  51
  52 #include "util/debug.h"
  53 #include "dri_common.h"
  54
  55 #include <X11/Xlib-xcb.h>
  56 #include <xcb/xcb.h>
  57 #include <xcb/glx.h>
  58
  59
  60 #ifdef DEBUG
  61 void __glXDumpDrawBuffer(struct glx_context * ctx);
  62 #endif
  63
  64 /*
  65 ** You can set this cell to 1 to force the gl drawing stuff to be
  66 ** one command per packet
  67 */
  68 _X_HIDDEN int __glXDebug = 0;
  69
  70 /* Extension required boiler plate */
  71
  72 static const char __glXExtensionName[] = GLX_EXTENSION_NAME;
  73 static struct glx_display *glx_displays;
  74
  75 static /* const */ char *error_list[] = {
  76    "GLXBadContext",
  77    "GLXBadContextState",
  78    "GLXBadDrawable",
  79    "GLXBadPixmap",
  80    "GLXBadContextTag",
  81    "GLXBadCurrentWindow",
  82    "GLXBadRenderRequest",
  83    "GLXBadLargeRequest",
  84    "GLXUnsupportedPrivateRequest",
  85    "GLXBadFBConfig",
  86    "GLXBadPbuffer",
  87    "GLXBadCurrentDrawable",
  88    "GLXBadWindow",
  89    "GLXBadProfileARB",
  90 };
  91
  92 #ifdef GLX_USE_APPLEGL
  93 static char *__glXErrorString(Display *dpy, int code, XExtCodes *codes,
  94                               char *buf, int n);
  95 #endif
  96
  97 static
  98 XEXT_GENERATE_ERROR_STRING(__glXErrorString, __glXExtensionName,
  99                            __GLX_NUMBER_ERRORS, error_list)
 100
 101 /*
 102  * GLX events are a bit funky.  We don't stuff the X event code into
 103  * our user exposed (via XNextEvent) structure.  Instead we use the GLX
 104  * private event code namespace (and hope it doesn't conflict).  Clients
 105  * have to know that bit 15 in the event type field means they're getting
 106  * a GLX event, and then handle the various sub-event types there, rather
 107  * than simply checking the event code and handling it directly.
 108  */
 109
 110 static Bool
 111 __glXWireToEvent(Display *dpy, XEvent *event, xEvent *wire)
 112 {
 113      struct glx_display *glx_dpy = __glXInitialize(dpy);
 114
 115    if (glx_dpy == NULL)
 116       return False;
 117
 118    switch ((wire->u.u.type & 0x7f) - glx_dpy->codes->first_event) {
 119    case GLX_PbufferClobber:
 120    {
 121       GLXPbufferClobberEvent *aevent = (GLXPbufferClobberEvent *)event;
 122       xGLXPbufferClobberEvent *awire = (xGLXPbufferClobberEvent *)wire;
 123       aevent->event_type = awire->type;
 124       aevent->serial = awire->sequenceNumber;
 125       aevent->event_type = awire->event_type;
 126       aevent->draw_type = awire->draw_type;
 127       aevent->drawable = awire->drawable;
 128       aevent->buffer_mask = awire->buffer_mask;
 129       aevent->aux_buffer = awire->aux_buffer;
 130       aevent->x = awire->x;
 131       aevent->y = awire->y;
 132       aevent->width = awire->width;
 133       aevent->height = awire->height;
 134       aevent->count = awire->count;
 135       return True;
 136    }
 137    case GLX_BufferSwapComplete:
 138    {
 139       GLXBufferSwapComplete *aevent = (GLXBufferSwapComplete *)event;
 140       xGLXBufferSwapComplete2 *awire = (xGLXBufferSwapComplete2 *)wire;
 141       struct glx_drawable *glxDraw = GetGLXDrawable(dpy, awire->drawable);
 142
 143       if (!glxDraw)
 144          return False;
 145
 146       aevent->serial = _XSetLastRequestRead(dpy, (xGenericReply *) wire);
 147       aevent->send_event = (awire->type & 0x80) != 0;
 148       aevent->display = dpy;
 149       aevent->event_type = awire->event_type;
 150       aevent->drawable = glxDraw->xDrawable;
 151       aevent->ust = ((CARD64)awire->ust_hi << 32) | awire->ust_lo;
 152       aevent->msc = ((CARD64)awire->msc_hi << 32) | awire->msc_lo;
 153
 154       /* Handle 32-Bit wire sbc wraparound in both directions to cope with out
 155        * of sequence 64-Bit sbc's
 156        */
 157       if ((int64_t) awire->sbc < ((int64_t) glxDraw->lastEventSbc - 0x40000000))
 158          glxDraw->eventSbcWrap += 0x100000000;
 159       if ((int64_t) awire->sbc > ((int64_t) glxDraw->lastEventSbc + 0x40000000))
 160          glxDraw->eventSbcWrap -= 0x100000000;
 161       glxDraw->lastEventSbc = awire->sbc;
 162       aevent->sbc = awire->sbc + glxDraw->eventSbcWrap;
 163       return True;
 164    }
 165    default:
 166       /* client doesn't support server event */
 167       break;
 168    }
 169
 170    return False;
 171 }
 172
 173 /* We don't actually support this.  It doesn't make sense for clients to
 174  * send each other GLX events.
 175  */
 176 static Status
 177 __glXEventToWire(Display *dpy, XEvent *event, xEvent *wire)
 178 {
 179      struct glx_display *glx_dpy = __glXInitialize(dpy);
 180
 181    if (glx_dpy == NULL)
 182       return False;
 183
 184    switch (event->type) {
 185    case GLX_DAMAGED:
 186       break;
 187    case GLX_SAVED:
 188       break;
 189    case GLX_EXCHANGE_COMPLETE_INTEL:
 190       break;
 191    case GLX_COPY_COMPLETE_INTEL:
 192       break;
 193    case GLX_FLIP_COMPLETE_INTEL:
 194       break;
 195    default:
 196       /* client doesn't support server event */
 197       break;
 198    }
 199
 200    return Success;
 201 }
 202
 203 /************************************************************************/
 204 /*
 205 ** Free the per screen configs data as well as the array of
 206 ** __glXScreenConfigs.
 207 */
 208 static void
 209 FreeScreenConfigs(struct glx_display * priv)
 210 {
 211    struct glx_screen *psc;
 212    GLint i, screens;
 213
 214    /* Free screen configuration information */
 215    screens = ScreenCount(priv->dpy);
 216    for (i = 0; i < screens; i++) {
 217       psc = priv->screens[i];
 218       if (!psc)
 219          continue;
 220       glx_screen_cleanup(psc);
 221
 222 #if defined(GLX_DIRECT_RENDERING) && !defined(GLX_USE_APPLEGL)
 223       if (psc->driScreen) {
 224          psc->driScreen->destroyScreen(psc);
 225       } else {
 226          free(psc);
 227       }
 228 #else
 229       free(psc);
 230 #endif
 231    }
 232    free((char *) priv->screens);
 233    priv->screens = NULL;
 234 }
 235
 236 static void
 237 glx_display_free(struct glx_display *priv)
 238 {
 239    struct glx_context *gc;
 240
 241    gc = __glXGetCurrentContext();
 242    if (priv->dpy == gc->currentDpy) {
 243       gc->vtable->destroy(gc);
 244       __glXSetCurrentContextNull();
 245    }
 246
 247    FreeScreenConfigs(priv);
 248    free((char *) priv->serverGLXvendor);
 249    free((char *) priv->serverGLXversion);
 250
 251    __glxHashDestroy(priv->glXDrawHash);
 252
 253 #if defined(GLX_DIRECT_RENDERING) && !defined(GLX_USE_APPLEGL)
 254    __glxHashDestroy(priv->drawHash);
 255
 256    /* Free the direct rendering per display data */
 257    if (priv->driswDisplay)
 258       (*priv->driswDisplay->destroyDisplay) (priv->driswDisplay);
 259    priv->driswDisplay = NULL;
 260
 261 #if defined (GLX_USE_DRM)
 262    if (priv->driDisplay)
 263       (*priv->driDisplay->destroyDisplay) (priv->driDisplay);
 264    priv->driDisplay = NULL;
 265
 266    if (priv->dri2Display)
 267       (*priv->dri2Display->destroyDisplay) (priv->dri2Display);
 268    priv->dri2Display = NULL;
 269
 270    if (priv->dri3Display)
 271       (*priv->dri3Display->destroyDisplay) (priv->dri3Display);
 272    priv->dri3Display = NULL;
 273 #endif /* GLX_USE_DRM */
 274
 275 #if defined(GLX_USE_WINDOWSGL)
 276    if (priv->windowsdriDisplay)
 277       (*priv->windowsdriDisplay->destroyDisplay) (priv->windowsdriDisplay);
 278    priv->windowsdriDisplay = NULL;
 279 #endif /* GLX_USE_WINDOWSGL */
 280
 281 #endif /* GLX_DIRECT_RENDERING && !GLX_USE_APPLEGL */
 282
 283    free((char *) priv);
 284 }
 285
 286 static int
 287 __glXCloseDisplay(Display * dpy, XExtCodes * codes)
 288 {
 289    struct glx_display *priv, **prev;
 290
 291    _XLockMutex(_Xglobal_lock);
 292    prev = &glx_displays;
 293    for (priv = glx_displays; priv; prev = &priv->next, priv = priv->next) {
 294       if (priv->dpy == dpy) {
 295          *prev = priv->next;
 296          break;
 297       }
 298    }
 299    _XUnlockMutex(_Xglobal_lock);
 300
 301    if (priv != NULL)
 302       glx_display_free(priv);
 303
 304    return 1;
 305 }
 306
 307 /*
 308 ** Query the version of the GLX extension.  This procedure works even if
 309 ** the client extension is not completely set up.
 310 */
 311 static Bool
 312 QueryVersion(Display * dpy, int opcode, int *major, int *minor)
 313 {
 314    xcb_connection_t *c = XGetXCBConnection(dpy);
 315    xcb_glx_query_version_reply_t *reply = xcb_glx_query_version_reply(c,
 316                                                                       xcb_glx_query_version
 317                                                                       (c,
 318                                                                        GLX_MAJOR_VERSION,
 319                                                                        GLX_MINOR_VERSION),
 320                                                                       NULL);
 321
 322    if (!reply)
 323      return GL_FALSE;
 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 }
 334
 335 /*
 336  * We don't want to enable this GLX_OML_swap_method in glxext.h,
 337  * because we can't support it.  The X server writes it out though,
 338  * so we should handle it somehow, to avoid false warnings.
 339  */
 340 enum {
 341     IGNORE_GLX_SWAP_METHOD_OML = 0x8060
 342 };
 343
 344
 345 static GLint
 346 convert_from_x_visual_type(int visualType)
 347 {
 348    static const int glx_visual_types[] = {
 349       [StaticGray]  = GLX_STATIC_GRAY,
 350       [GrayScale]   = GLX_GRAY_SCALE,
 351       [StaticColor] = GLX_STATIC_COLOR,
 352       [PseudoColor] = GLX_PSEUDO_COLOR,
 353       [TrueColor]   = GLX_TRUE_COLOR,
 354       [DirectColor] = GLX_DIRECT_COLOR,
 355    };
 356
 357    if (visualType < ARRAY_SIZE(glx_visual_types))
 358       return glx_visual_types[visualType];
 359
 360    return GLX_NONE;
 361 }
 362
 363 /*
 364  * getVisualConfigs uses the !tagged_only path.
 365  * getFBConfigs uses the tagged_only path.
 366  */
 367 _X_HIDDEN void
 368 __glXInitializeVisualConfigFromTags(struct glx_config * config, int count,
 369                                     const INT32 * bp, Bool tagged_only,
 370                                     Bool fbconfig_style_tags)
 371 {
 372    int i;
 373
 374    if (!tagged_only) {
 375       /* Copy in the first set of properties */
 376       config->visualID = *bp++;
 377
 378       config->visualType = convert_from_x_visual_type(*bp++);
 379
 380       config->renderType = *bp++ ? GLX_RGBA_BIT : GLX_COLOR_INDEX_BIT;
 381
 382       config->redBits = *bp++;
 383       config->greenBits = *bp++;
 384       config->blueBits = *bp++;
 385       config->alphaBits = *bp++;
 386       config->accumRedBits = *bp++;
 387       config->accumGreenBits = *bp++;
 388       config->accumBlueBits = *bp++;
 389       config->accumAlphaBits = *bp++;
 390
 391       config->doubleBufferMode = *bp++;
 392       config->stereoMode = *bp++;
 393
 394       config->rgbBits = *bp++;
 395       config->depthBits = *bp++;
 396       config->stencilBits = *bp++;
 397       config->numAuxBuffers = *bp++;
 398       config->level = *bp++;
 399
 400 #ifdef GLX_USE_APPLEGL
 401        /* AppleSGLX supports pixmap and pbuffers with all config. */
 402        config->drawableType = GLX_WINDOW_BIT | GLX_PIXMAP_BIT | GLX_PBUFFER_BIT;
 403        /* Unfortunately this can create an ABI compatibility problem. */
 404        count -= 18;
 405 #else
 406       count -= __GLX_MIN_CONFIG_PROPS;
 407 #endif
 408    }
 409
 410    /*
 411     ** Additional properties may be in a list at the end
 412     ** of the reply.  They are in pairs of property type
 413     ** and property value.
 414     */
 415
 416 #define FETCH_OR_SET(tag) \
 417     config-> tag = ( fbconfig_style_tags ) ? *bp++ : 1
 418
 419    for (i = 0; i < count; i += 2) {
 420       long int tag = *bp++;
 421
 422       switch (tag) {
 423       case GLX_RGBA:
 424          if (fbconfig_style_tags)
 425             config->renderType = *bp++ ? GLX_RGBA_BIT : GLX_COLOR_INDEX_BIT;
 426          else
 427             config->renderType = GLX_RGBA_BIT;
 428          break;
 429       case GLX_BUFFER_SIZE:
 430          config->rgbBits = *bp++;
 431          break;
 432       case GLX_LEVEL:
 433          config->level = *bp++;
 434          break;
 435       case GLX_DOUBLEBUFFER:
 436          FETCH_OR_SET(doubleBufferMode);
 437          break;
 438       case GLX_STEREO:
 439          FETCH_OR_SET(stereoMode);
 440          break;
 441       case GLX_AUX_BUFFERS:
 442          config->numAuxBuffers = *bp++;
 443          break;
 444       case GLX_RED_SIZE:
 445          config->redBits = *bp++;
 446          break;
 447       case GLX_GREEN_SIZE:
 448          config->greenBits = *bp++;
 449          break;
 450       case GLX_BLUE_SIZE:
 451          config->blueBits = *bp++;
 452          break;
 453       case GLX_ALPHA_SIZE:
 454          config->alphaBits = *bp++;
 455          break;
 456       case GLX_DEPTH_SIZE:
 457          config->depthBits = *bp++;
 458          break;
 459       case GLX_STENCIL_SIZE:
 460          config->stencilBits = *bp++;
 461          break;
 462       case GLX_ACCUM_RED_SIZE:
 463          config->accumRedBits = *bp++;
 464          break;
 465       case GLX_ACCUM_GREEN_SIZE:
 466          config->accumGreenBits = *bp++;
 467          break;
 468       case GLX_ACCUM_BLUE_SIZE:
 469          config->accumBlueBits = *bp++;
 470          break;
 471       case GLX_ACCUM_ALPHA_SIZE:
 472          config->accumAlphaBits = *bp++;
 473          break;
 474       case GLX_VISUAL_CAVEAT_EXT:
 475          config->visualRating = *bp++;
 476          break;
 477       case GLX_X_VISUAL_TYPE:
 478          config->visualType = *bp++;
 479          break;
 480       case GLX_TRANSPARENT_TYPE:
 481          config->transparentPixel = *bp++;
 482          break;
 483       case GLX_TRANSPARENT_INDEX_VALUE:
 484          config->transparentIndex = *bp++;
 485          break;
 486       case GLX_TRANSPARENT_RED_VALUE:
 487          config->transparentRed = *bp++;
 488          break;
 489       case GLX_TRANSPARENT_GREEN_VALUE:
 490          config->transparentGreen = *bp++;
 491          break;
 492       case GLX_TRANSPARENT_BLUE_VALUE:
 493          config->transparentBlue = *bp++;
 494          break;
 495       case GLX_TRANSPARENT_ALPHA_VALUE:
 496          config->transparentAlpha = *bp++;
 497          break;
 498       case GLX_VISUAL_ID:
 499          config->visualID = *bp++;
 500          break;
 501       case GLX_DRAWABLE_TYPE:
 502          config->drawableType = *bp++;
 503 #ifdef GLX_USE_APPLEGL
 504          /* AppleSGLX supports pixmap and pbuffers with all config. */
 505          config->drawableType |= GLX_WINDOW_BIT | GLX_PIXMAP_BIT | GLX_PBUFFER_BIT;
 506 #endif
 507          break;
 508       case GLX_RENDER_TYPE: /* fbconfig render type bits */
 509          config->renderType = *bp++;
 510          break;
 511       case GLX_X_RENDERABLE:
 512          config->xRenderable = *bp++;
 513          break;
 514       case GLX_FBCONFIG_ID:
 515          config->fbconfigID = *bp++;
 516          break;
 517       case GLX_MAX_PBUFFER_WIDTH:
 518          config->maxPbufferWidth = *bp++;
 519          break;
 520       case GLX_MAX_PBUFFER_HEIGHT:
 521          config->maxPbufferHeight = *bp++;
 522          break;
 523       case GLX_MAX_PBUFFER_PIXELS:
 524          config->maxPbufferPixels = *bp++;
 525          break;
 526 #ifndef GLX_USE_APPLEGL
 527       case GLX_OPTIMAL_PBUFFER_WIDTH_SGIX:
 528          config->optimalPbufferWidth = *bp++;
 529          break;
 530       case GLX_OPTIMAL_PBUFFER_HEIGHT_SGIX:
 531          config->optimalPbufferHeight = *bp++;
 532          break;
 533       case GLX_VISUAL_SELECT_GROUP_SGIX:
 534          config->visualSelectGroup = *bp++;
 535          break;
 536       case GLX_SWAP_METHOD_OML:
 537          if (*bp == GLX_SWAP_UNDEFINED_OML ||
 538              *bp == GLX_SWAP_COPY_OML ||
 539              *bp == GLX_SWAP_EXCHANGE_OML) {
 540             config->swapMethod = *bp++;
 541          } else {
 542             /* X servers with old HW drivers may return any value here, so
 543              * assume GLX_SWAP_METHOD_UNDEFINED.
 544              */
 545             config->swapMethod = GLX_SWAP_UNDEFINED_OML;
 546             bp++;
 547          }
 548          break;
 549 #endif
 550       case GLX_SAMPLE_BUFFERS_SGIS:
 551          config->sampleBuffers = *bp++;
 552          break;
 553       case GLX_SAMPLES_SGIS:
 554          config->samples = *bp++;
 555          break;
 556 #ifdef GLX_USE_APPLEGL
 557       case IGNORE_GLX_SWAP_METHOD_OML:
 558          /* We ignore this tag.  See the comment above this function. */
 559          ++bp;
 560          break;
 561 #else
 562       case GLX_BIND_TO_TEXTURE_RGB_EXT:
 563          config->bindToTextureRgb = *bp++;
 564          break;
 565       case GLX_BIND_TO_TEXTURE_RGBA_EXT:
 566          config->bindToTextureRgba = *bp++;
 567          break;
 568       case GLX_BIND_TO_MIPMAP_TEXTURE_EXT:
 569          config->bindToMipmapTexture = *bp++;
 570          break;
 571       case GLX_BIND_TO_TEXTURE_TARGETS_EXT:
 572          config->bindToTextureTargets = *bp++;
 573          break;
 574       case GLX_Y_INVERTED_EXT:
 575          config->yInverted = *bp++;
 576          break;
 577 #endif
 578       case GLX_FRAMEBUFFER_SRGB_CAPABLE_EXT:
 579          config->sRGBCapable = *bp++;
 580          break;
 581
 582       case GLX_USE_GL:
 583          if (fbconfig_style_tags)
 584             bp++;
 585          break;
 586       case None:
 587          i = count;
 588          break;
 589       default:
 590          if(env_var_as_boolean("LIBGL_DIAGNOSTIC", false)) {
 591              long int tagvalue = *bp++;
 592              fprintf(stderr, "WARNING: unknown GLX tag from server: "
 593                      "tag 0x%lx value 0x%lx\n", tag, tagvalue);
 594          } else {
 595              /* Ignore the unrecognized tag's value */
 596              bp++;
 597          }
 598          break;
 599       }
 600    }
 601
 602    /* The GLX_ARB_fbconfig_float spec says:
 603     *
 604     *     "Note that floating point rendering is only supported for
 605     *     GLXPbuffer drawables."
 606     */
 607    if (config->renderType &
 608        (GLX_RGBA_FLOAT_BIT_ARB|GLX_RGBA_UNSIGNED_FLOAT_BIT_EXT))
 609       config->drawableType &= GLX_PBUFFER_BIT;
 610 }
 611
 612 static struct glx_config *
 613 createConfigsFromProperties(Display * dpy, int nvisuals, int nprops,
 614                             int screen, GLboolean tagged_only)
 615 {
 616    INT32 buf[__GLX_TOTAL_CONFIG], *props;
 617    unsigned prop_size;
 618    struct glx_config *modes, *m;
 619    int i;
 620
 621    if (nprops == 0)
 622       return NULL;
 623
 624    /* FIXME: Is the __GLX_MIN_CONFIG_PROPS test correct for FBconfigs? */
 625
 626    /* Check number of properties */
 627    if (nprops < __GLX_MIN_CONFIG_PROPS || nprops > __GLX_MAX_CONFIG_PROPS)
 628       return NULL;
 629
 630    /* Allocate memory for our config structure */
 631    modes = glx_config_create_list(nvisuals);
 632    if (!modes)
 633       return NULL;
 634
 635    prop_size = nprops * __GLX_SIZE_INT32;
 636    if (prop_size <= sizeof(buf))
 637       props = buf;
 638    else
 639       props = malloc(prop_size);
 640
 641    /* Read each config structure and convert it into our format */
 642    m = modes;
 643    for (i = 0; i < nvisuals; i++) {
 644       _XRead(dpy, (char *) props, prop_size);
 645 #ifdef GLX_USE_APPLEGL
 646        /* Older X servers don't send this so we default it here. */
 647       m->drawableType = GLX_WINDOW_BIT;
 648 #else
 649       /*
 650        * The XQuartz 2.3.2.1 X server doesn't set this properly, so
 651        * set the proper bits here.
 652        * AppleSGLX supports windows, pixmaps, and pbuffers with all config.
 653        */
 654       m->drawableType = GLX_WINDOW_BIT | GLX_PIXMAP_BIT | GLX_PBUFFER_BIT;
 655 #endif
 656       /* Older X servers don't send this so we default it here. */
 657       m->sRGBCapable = GL_FALSE;
 658        __glXInitializeVisualConfigFromTags(m, nprops, props,
 659                                           tagged_only, GL_TRUE);
 660       m->screen = screen;
 661       m = m->next;
 662    }
 663
 664    if (props != buf)
 665       free(props);
 666
 667    return modes;
 668 }
 669
 670 static GLboolean
 671 getVisualConfigs(struct glx_screen *psc,
 672                   struct glx_display *priv, int screen)
 673 {
 674    xGLXGetVisualConfigsReq *req;
 675    xGLXGetVisualConfigsReply reply;
 676    Display *dpy = priv->dpy;
 677
 678    LockDisplay(dpy);
 679
 680    psc->visuals = NULL;
 681    GetReq(GLXGetVisualConfigs, req);
 682    req->reqType = priv->majorOpcode;
 683    req->glxCode = X_GLXGetVisualConfigs;
 684    req->screen = screen;
 685
 686    if (!_XReply(dpy, (xReply *) & reply, 0, False))
 687       goto out;
 688
 689    psc->visuals = createConfigsFromProperties(dpy,
 690                                               reply.numVisuals,
 691                                               reply.numProps,
 692                                               screen, GL_FALSE);
 693
 694  out:
 695    UnlockDisplay(dpy);
 696    return psc->visuals != NULL;
 697 }
 698
 699 static GLboolean
 700  getFBConfigs(struct glx_screen *psc, struct glx_display *priv, int screen)
 701 {
 702    xGLXGetFBConfigsReq *fb_req;
 703    xGLXGetFBConfigsSGIXReq *sgi_req;
 704    xGLXVendorPrivateWithReplyReq *vpreq;
 705    xGLXGetFBConfigsReply reply;
 706    Display *dpy = priv->dpy;
 707
 708    psc->serverGLXexts =
 709       __glXQueryServerString(dpy, priv->majorOpcode, screen, GLX_EXTENSIONS);
 710
 711    if (psc->serverGLXexts == NULL) {
 712       return GL_FALSE;
 713    }
 714
 715    LockDisplay(dpy);
 716
 717    psc->configs = NULL;
 718    if (priv->majorVersion > 1 ||
 719        (priv->majorVersion == 1 && priv->minorVersion >= 3)) {
 720       GetReq(GLXGetFBConfigs, fb_req);
 721       fb_req->reqType = priv->majorOpcode;
 722       fb_req->glxCode = X_GLXGetFBConfigs;
 723       fb_req->screen = screen;
 724    }
 725    else if (strstr(psc->serverGLXexts, "GLX_SGIX_fbconfig") != NULL) {
 726       GetReqExtra(GLXVendorPrivateWithReply,
 727                   sz_xGLXGetFBConfigsSGIXReq -
 728                   sz_xGLXVendorPrivateWithReplyReq, vpreq);
 729       sgi_req = (xGLXGetFBConfigsSGIXReq *) vpreq;
 730       sgi_req->reqType = priv->majorOpcode;
 731       sgi_req->glxCode = X_GLXVendorPrivateWithReply;
 732       sgi_req->vendorCode = X_GLXvop_GetFBConfigsSGIX;
 733       sgi_req->screen = screen;
 734    }
 735    else
 736       goto out;
 737
 738    if (!_XReply(dpy, (xReply *) & reply, 0, False))
 739       goto out;
 740
 741    psc->configs = createConfigsFromProperties(dpy,
 742                                               reply.numFBConfigs,
 743                                               reply.numAttribs * 2,
 744                                               screen, GL_TRUE);
 745
 746  out:
 747    UnlockDisplay(dpy);
 748    return psc->configs != NULL;
 749 }
 750
 751 _X_HIDDEN Bool
 752 glx_screen_init(struct glx_screen *psc,
 753                  int screen, struct glx_display * priv)
 754 {
 755    /* Initialize per screen dynamic client GLX extensions */
 756    psc->ext_list_first_time = GL_TRUE;
 757    psc->scr = screen;
 758    psc->dpy = priv->dpy;
 759    psc->display = priv;
 760
 761    if (!getVisualConfigs(psc, priv, screen))
 762       return GL_FALSE;
 763
 764    if (!getFBConfigs(psc, priv, screen))
 765       return GL_FALSE;
 766
 767    return GL_TRUE;
 768 }
 769
 770 _X_HIDDEN void
 771 glx_screen_cleanup(struct glx_screen *psc)
 772 {
 773    if (psc->configs) {
 774       glx_config_destroy_list(psc->configs);
 775       free(psc->effectiveGLXexts);
 776       psc->configs = NULL;   /* NOTE: just for paranoia */
 777    }
 778    if (psc->visuals) {
 779       glx_config_destroy_list(psc->visuals);
 780       psc->visuals = NULL;   /* NOTE: just for paranoia */
 781    }
 782    free((char *) psc->serverGLXexts);
 783 }
 784
 785 /*
 786 ** Allocate the memory for the per screen configs for each screen.
 787 ** If that works then fetch the per screen configs data.
 788 */
 789 static Bool
 790 AllocAndFetchScreenConfigs(Display * dpy, struct glx_display * priv)
 791 {
 792    struct glx_screen *psc;
 793    GLint i, screens;
 794
 795    /*
 796     ** First allocate memory for the array of per screen configs.
 797     */
 798    screens = ScreenCount(dpy);
 799    priv->screens = calloc(screens, sizeof *priv->screens);
 800    if (!priv->screens)
 801       return GL_FALSE;
 802
 803    priv->serverGLXversion =
 804       __glXQueryServerString(dpy, priv->majorOpcode, 0, GLX_VERSION);
 805    if (priv->serverGLXversion == NULL) {
 806       FreeScreenConfigs(priv);
 807       return GL_FALSE;
 808    }
 809
 810    for (i = 0; i < screens; i++, psc++) {
 811       psc = NULL;
 812 #if defined(GLX_DIRECT_RENDERING) && !defined(GLX_USE_APPLEGL)
 813 #if defined(GLX_USE_DRM)
 814 #if defined(HAVE_DRI3)
 815       if (priv->dri3Display)
 816          psc = (*priv->dri3Display->createScreen) (i, priv);
 817 #endif /* HAVE_DRI3 */
 818       if (psc == NULL && priv->dri2Display)
 819          psc = (*priv->dri2Display->createScreen) (i, priv);
 820       if (psc == NULL && priv->driDisplay)
 821          psc = (*priv->driDisplay->createScreen) (i, priv);
 822 #endif /* GLX_USE_DRM */
 823
 824 #ifdef GLX_USE_WINDOWSGL
 825       if (psc == NULL && priv->windowsdriDisplay)
 826          psc = (*priv->windowsdriDisplay->createScreen) (i, priv);
 827 #endif
 828
 829       if (psc == NULL && priv->driswDisplay)
 830          psc = (*priv->driswDisplay->createScreen) (i, priv);
 831 #endif /* GLX_DIRECT_RENDERING && !GLX_USE_APPLEGL */
 832
 833 #if defined(GLX_USE_APPLEGL)
 834       if (psc == NULL)
 835          psc = applegl_create_screen(i, priv);
 836 #else
 837       if (psc == NULL)
 838          psc = indirect_create_screen(i, priv);
 839 #endif
 840       priv->screens[i] = psc;
 841    }
 842    SyncHandle();
 843    return GL_TRUE;
 844 }
 845
 846 /*
 847 ** Initialize the client side extension code.
 848 */
 849  _X_HIDDEN struct glx_display *
 850 __glXInitialize(Display * dpy)
 851 {
 852    struct glx_display *dpyPriv, *d;
 853 #if defined(GLX_DIRECT_RENDERING) && !defined(GLX_USE_APPLEGL)
 854    Bool glx_direct, glx_accel;
 855 #endif
 856    int i;
 857
 858    _XLockMutex(_Xglobal_lock);
 859
 860    for (dpyPriv = glx_displays; dpyPriv; dpyPriv = dpyPriv->next) {
 861       if (dpyPriv->dpy == dpy) {
 862          _XUnlockMutex(_Xglobal_lock);
 863          return dpyPriv;
 864       }
 865    }
 866
 867    /* Drop the lock while we create the display private. */
 868    _XUnlockMutex(_Xglobal_lock);
 869
 870    dpyPriv = calloc(1, sizeof *dpyPriv);
 871    if (!dpyPriv)
 872       return NULL;
 873
 874    dpyPriv->codes = XInitExtension(dpy, __glXExtensionName);
 875    if (!dpyPriv->codes) {
 876       free(dpyPriv);
 877       return NULL;
 878    }
 879
 880    dpyPriv->dpy = dpy;
 881    dpyPriv->majorOpcode = dpyPriv->codes->major_opcode;
 882    dpyPriv->serverGLXvendor = 0x0;
 883    dpyPriv->serverGLXversion = 0x0;
 884
 885    /* See if the versions are compatible.  This GLX implementation does not
 886     * work with servers that only support GLX 1.0.
 887     */
 888    if (!QueryVersion(dpy, dpyPriv->majorOpcode,
 889                      &dpyPriv->majorVersion, &dpyPriv->minorVersion)
 890        || (dpyPriv->majorVersion == 1 && dpyPriv->minorVersion < 1)) {
 891       free(dpyPriv);
 892       return NULL;
 893    }
 894
 895    for (i = 0; i < __GLX_NUMBER_EVENTS; i++) {
 896       XESetWireToEvent(dpy, dpyPriv->codes->first_event + i, __glXWireToEvent);
 897       XESetEventToWire(dpy, dpyPriv->codes->first_event + i, __glXEventToWire);
 898    }
 899
 900    XESetCloseDisplay(dpy, dpyPriv->codes->extension, __glXCloseDisplay);
 901    XESetErrorString (dpy, dpyPriv->codes->extension, __glXErrorString);
 902
 903    dpyPriv->glXDrawHash = __glxHashCreate();
 904
 905 #if defined(GLX_DIRECT_RENDERING) && !defined(GLX_USE_APPLEGL)
 906    glx_direct = !env_var_as_boolean("LIBGL_ALWAYS_INDIRECT", false);
 907    glx_accel = !env_var_as_boolean("LIBGL_ALWAYS_SOFTWARE", false);
 908
 909    dpyPriv->drawHash = __glxHashCreate();
 910
 911    /* Set the logger before the *CreateDisplay functions. */
 912    loader_set_logger(dri_message);
 913
 914    /*
 915     ** Initialize the direct rendering per display data and functions.
 916     ** Note: This _must_ be done before calling any other DRI routines
 917     ** (e.g., those called in AllocAndFetchScreenConfigs).
 918     */
 919 #if defined(GLX_USE_DRM)
 920    if (glx_direct && glx_accel) {
 921 #if defined(HAVE_DRI3)
 922       if (!env_var_as_boolean("LIBGL_DRI3_DISABLE", false))
 923          dpyPriv->dri3Display = dri3_create_display(dpy);
 924 #endif /* HAVE_DRI3 */
 925       dpyPriv->dri2Display = dri2CreateDisplay(dpy);
 926       dpyPriv->driDisplay = driCreateDisplay(dpy);
 927    }
 928 #endif /* GLX_USE_DRM */
 929    if (glx_direct)
 930       dpyPriv->driswDisplay = driswCreateDisplay(dpy);
 931 #endif /* GLX_DIRECT_RENDERING && !GLX_USE_APPLEGL */
 932
 933 #ifdef GLX_USE_APPLEGL
 934    if (!applegl_create_display(dpyPriv)) {
 935       free(dpyPriv);
 936       return NULL;
 937    }
 938 #endif
 939
 940 #ifdef GLX_USE_WINDOWSGL
 941    if (glx_direct && glx_accel)
 942       dpyPriv->windowsdriDisplay = driwindowsCreateDisplay(dpy);
 943 #endif
 944
 945    if (!AllocAndFetchScreenConfigs(dpy, dpyPriv)) {
 946       free(dpyPriv);
 947       return NULL;
 948    }
 949
 950    __glX_send_client_info(dpyPriv);
 951
 952    /* Grab the lock again and add the dispay private, unless somebody
 953     * beat us to initializing on this display in the meantime. */
 954    _XLockMutex(_Xglobal_lock);
 955
 956    for (d = glx_displays; d; d = d->next) {
 957       if (d->dpy == dpy) {
 958          _XUnlockMutex(_Xglobal_lock);
 959          glx_display_free(dpyPriv);
 960          return d;
 961       }
 962    }
 963
 964    dpyPriv->next = glx_displays;
 965    glx_displays = dpyPriv;
 966
 967    _XUnlockMutex(_Xglobal_lock);
 968
 969    return dpyPriv;
 970 }
 971
 972 /*
 973 ** Setup for sending a GLX command on dpy.  Make sure the extension is
 974 ** initialized.  Try to avoid calling __glXInitialize as its kinda slow.
 975 */
 976 _X_HIDDEN CARD8
 977 __glXSetupForCommand(Display * dpy)
 978 {
 979     struct glx_context *gc;
 980     struct glx_display *priv;
 981
 982    /* If this thread has a current context, flush its rendering commands */
 983    gc = __glXGetCurrentContext();
 984    if (gc->currentDpy) {
 985       /* Flush rendering buffer of the current context, if any */
 986       (void) __glXFlushRenderBuffer(gc, gc->pc);
 987
 988       if (gc->currentDpy == dpy) {
 989          /* Use opcode from gc because its right */
 990          return gc->majorOpcode;
 991       }
 992       else {
 993          /*
 994           ** Have to get info about argument dpy because it might be to
 995           ** a different server
 996           */
 997       }
 998    }
 999
1000    /* Forced to lookup extension via the slow initialize route */
1001    priv = __glXInitialize(dpy);
1002    if (!priv) {
1003       return 0;
1004    }
1005    return priv->majorOpcode;
1006 }
1007
1008 /**
1009  * Flush the drawing command transport buffer.
1010  *
1011  * \param ctx  Context whose transport buffer is to be flushed.
1012  * \param pc   Pointer to first unused buffer location.
1013  *
1014  * \todo
1015  * Modify this function to use \c ctx->pc instead of the explicit
1016  * \c pc parameter.
1017  */
1018 _X_HIDDEN GLubyte *
1019 __glXFlushRenderBuffer(struct glx_context * ctx, GLubyte * pc)
1020 {
1021    Display *const dpy = ctx->currentDpy;
1022    xcb_connection_t *c = XGetXCBConnection(dpy);
1023    const GLint size = pc - ctx->buf;
1024
1025    if ((dpy != NULL) && (size > 0)) {
1026       xcb_glx_render(c, ctx->currentContextTag, size,
1027                      (const uint8_t *) ctx->buf);
1028    }
1029
1030    /* Reset pointer and return it */
1031    ctx->pc = ctx->buf;
1032    return ctx->pc;
1033 }
1034
1035
1036 /**
1037  * Send a portion of a GLXRenderLarge command to the server.  The advantage of
1038  * this function over \c __glXSendLargeCommand is that callers can use the
1039  * data buffer in the GLX context and may be able to avoid allocating an
1040  * extra buffer.  The disadvantage is the clients will have to do more
1041  * GLX protocol work (i.e., calculating \c totalRequests, etc.).
1042  *
1043  * \sa __glXSendLargeCommand
1044  *
1045  * \param gc             GLX context
1046  * \param requestNumber  Which part of the whole command is this?  The first
1047  *                       request is 1.
1048  * \param totalRequests  How many requests will there be?
1049  * \param data           Command data.
1050  * \param dataLen        Size, in bytes, of the command data.
1051  */
1052 _X_HIDDEN void
1053 __glXSendLargeChunk(struct glx_context * gc, GLint requestNumber,
1054                     GLint totalRequests, const GLvoid * data, GLint dataLen)
1055 {
1056    Display *dpy = gc->currentDpy;
1057    xcb_connection_t *c = XGetXCBConnection(dpy);
1058    xcb_glx_render_large(c, gc->currentContextTag, requestNumber,
1059                         totalRequests, dataLen, data);
1060 }
1061
1062
1063 /**
1064  * Send a command that is too large for the GLXRender protocol request.
1065  *
1066  * Send a large command, one that is too large for some reason to
1067  * send using the GLXRender protocol request.  One reason to send
1068  * a large command is to avoid copying the data.
1069  *
1070  * \param ctx        GLX context
1071  * \param header     Header data.
1072  * \param headerLen  Size, in bytes, of the header data.  It is assumed that
1073  *                   the header data will always be small enough to fit in
1074  *                   a single X protocol packet.
1075  * \param data       Command data.
1076  * \param dataLen    Size, in bytes, of the command data.
1077  */
1078 _X_HIDDEN void
1079 __glXSendLargeCommand(struct glx_context * ctx,
1080                       const GLvoid * header, GLint headerLen,
1081                       const GLvoid * data, GLint dataLen)
1082 {
1083    GLint maxSize;
1084    GLint totalRequests, requestNumber;
1085
1086    /*
1087     ** Calculate the maximum amount of data can be stuffed into a single
1088     ** packet.  sz_xGLXRenderReq is added because bufSize is the maximum
1089     ** packet size minus sz_xGLXRenderReq.
1090     */
1091    maxSize = (ctx->bufSize + sz_xGLXRenderReq) - sz_xGLXRenderLargeReq;
1092    totalRequests = 1 + (dataLen / maxSize);
1093    if (dataLen % maxSize)
1094       totalRequests++;
1095
1096    /*
1097     ** Send all of the command, except the large array, as one request.
1098     */
1099    assert(headerLen <= maxSize);
1100    __glXSendLargeChunk(ctx, 1, totalRequests, header, headerLen);
1101
1102    /*
1103     ** Send enough requests until the whole array is sent.
1104     */
1105    for (requestNumber = 2; requestNumber <= (totalRequests - 1);
1106         requestNumber++) {
1107       __glXSendLargeChunk(ctx, requestNumber, totalRequests, data, maxSize);
1108       data = (const GLvoid *) (((const GLubyte *) data) + maxSize);
1109       dataLen -= maxSize;
1110       assert(dataLen > 0);
1111    }
1112
1113    assert(dataLen <= maxSize);
1114    __glXSendLargeChunk(ctx, requestNumber, totalRequests, data, dataLen);
1115 }
1116
1117 /************************************************************************/
1118
1119 #ifdef DEBUG
1120 _X_HIDDEN void
1121 __glXDumpDrawBuffer(struct glx_context * ctx)
1122 {
1123    GLubyte *p = ctx->buf;
1124    GLubyte *end = ctx->pc;
1125    GLushort opcode, length;
1126
1127    while (p < end) {
1128       /* Fetch opcode */
1129       opcode = *((GLushort *) p);
1130       length = *((GLushort *) (p + 2));
1131       printf("%2x: %5d: ", opcode, length);
1132       length -= 4;
1133       p += 4;
1134       while (length > 0) {
1135          printf("%08x ", *((unsigned *) p));
1136          p += 4;
1137          length -= 4;
1138       }
1139       printf("\n");
1140    }
1141 }
1142 #endif