src/gallium/winsys/xlib/xm_api.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.1
   4  *
   5  * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * 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  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 /**
  26  * \file xm_api.c
  27  *
  28  * All the XMesa* API functions.
  29  *
  30  *
  31  * NOTES:
  32  *
  33  * The window coordinate system origin (0,0) is in the lower-left corner
  34  * of the window.  X11's window coordinate origin is in the upper-left
  35  * corner of the window.  Therefore, most drawing functions in this
  36  * file have to flip Y coordinates.
  37  *
  38  * Define USE_XSHM in the Makefile with -DUSE_XSHM if you want to compile
  39  * in support for the MIT Shared Memory extension.  If enabled, when you
  40  * use an Ximage for the back buffer in double buffered mode, the "swap"
  41  * operation will be faster.  You must also link with -lXext.
  42  *
  43  * Byte swapping:  If the Mesa host and the X display use a different
  44  * byte order then there's some trickiness to be aware of when using
  45  * XImages.  The byte ordering used for the XImage is that of the X
  46  * display, not the Mesa host.
  47  * The color-to-pixel encoding for True/DirectColor must be done
  48  * according to the display's visual red_mask, green_mask, and blue_mask.
  49  * If XPutPixel is used to put a pixel into an XImage then XPutPixel will
  50  * do byte swapping if needed.  If one wants to directly "poke" the pixel
  51  * into the XImage's buffer then the pixel must be byte swapped first.
  52  *
  53  */
  54
  55 #ifdef __CYGWIN__
  56 #undef WIN32
  57 #undef __WIN32__
  58 #endif
  59
  60 #include "glxheader.h"
  61 #include "GL/xmesa.h"
  62 #include "xmesaP.h"
  63 #include "main/context.h"
  64 #include "main/framebuffer.h"
  65 #include "glapi/glthread.h"
  66
  67 #include "state_tracker/st_public.h"
  68 #include "state_tracker/st_context.h"
  69 #include "pipe/p_defines.h"
  70 #include "pipe/p_context.h"
  71
  72 #include "xm_winsys_aub.h"
  73
  74 /**
  75  * Global X driver lock
  76  */
  77 _glthread_Mutex _xmesa_lock;
  78
  79
  80 int xmesa_mode;
  81
  82
  83 /**********************************************************************/
  84 /*****                     X Utility Functions                    *****/
  85 /**********************************************************************/
  86
  87
  88 /**
  89  * Return the host's byte order as LSBFirst or MSBFirst ala X.
  90  */
  91 #ifndef XFree86Server
  92 static int host_byte_order( void )
  93 {
  94    int i = 1;
  95    char *cptr = (char *) &i;
  96    return (*cptr==1) ? LSBFirst : MSBFirst;
  97 }
  98 #endif
  99
 100
 101 /**
 102  * Check if the X Shared Memory extension is available.
 103  * Return:  0 = not available
 104  *          1 = shared XImage support available
 105  *          2 = shared Pixmap support available also
 106  */
 107 int xmesa_check_for_xshm( XMesaDisplay *display )
 108 {
 109 #if defined(USE_XSHM) && !defined(XFree86Server)
 110    int major, minor, ignore;
 111    Bool pixmaps;
 112
 113    if (getenv("SP_NO_RAST"))
 114       return 0;
 115
 116    if (getenv("MESA_NOSHM")) {
 117       return 0;
 118    }
 119
 120    if (XQueryExtension( display, "MIT-SHM", &ignore, &ignore, &ignore )) {
 121       if (XShmQueryVersion( display, &major, &minor, &pixmaps )==True) {
 122          return (pixmaps==True) ? 2 : 1;
 123       }
 124       else {
 125          return 0;
 126       }
 127    }
 128    else {
 129       return 0;
 130    }
 131 #else
 132    /* No  XSHM support */
 133    return 0;
 134 #endif
 135 }
 136
 137
 138 /**
 139  * Return the true number of bits per pixel for XImages.
 140  * For example, if we request a 24-bit deep visual we may actually need/get
 141  * 32bpp XImages.  This function returns the appropriate bpp.
 142  * Input:  dpy - the X display
 143  *         visinfo - desribes the visual to be used for XImages
 144  * Return:  true number of bits per pixel for XImages
 145  */
 146 static int
 147 bits_per_pixel( XMesaVisual xmv )
 148 {
 149 #ifdef XFree86Server
 150    const int depth = xmv->nplanes;
 151    int i;
 152    assert(depth > 0);
 153    for (i = 0; i < screenInfo.numPixmapFormats; i++) {
 154       if (screenInfo.formats[i].depth == depth)
 155          return screenInfo.formats[i].bitsPerPixel;
 156    }
 157    return depth;  /* should never get here, but this should be safe */
 158 #else
 159    XMesaDisplay *dpy = xmv->display;
 160    XMesaVisualInfo visinfo = xmv->visinfo;
 161    XMesaImage *img;
 162    int bitsPerPixel;
 163    /* Create a temporary XImage */
 164    img = XCreateImage( dpy, visinfo->visual, visinfo->depth,
 165                        ZPixmap, 0,           /*format, offset*/
 166                        (char*) MALLOC(8),    /*data*/
 167                        1, 1,                 /*width, height*/
 168                        32,                   /*bitmap_pad*/
 169                        0                     /*bytes_per_line*/
 170                      );
 171    assert(img);
 172    /* grab the bits/pixel value */
 173    bitsPerPixel = img->bits_per_pixel;
 174    /* free the XImage */
 175    _mesa_free( img->data );
 176    img->data = NULL;
 177    XMesaDestroyImage( img );
 178    return bitsPerPixel;
 179 #endif
 180 }
 181
 182
 183
 184 /*
 185  * Determine if a given X window ID is valid (window exists).
 186  * Do this by calling XGetWindowAttributes() for the window and
 187  * checking if we catch an X error.
 188  * Input:  dpy - the display
 189  *         win - the window to check for existance
 190  * Return:  GL_TRUE - window exists
 191  *          GL_FALSE - window doesn't exist
 192  */
 193 #ifndef XFree86Server
 194 static GLboolean WindowExistsFlag;
 195
 196 static int window_exists_err_handler( XMesaDisplay* dpy, XErrorEvent* xerr )
 197 {
 198    (void) dpy;
 199    if (xerr->error_code == BadWindow) {
 200       WindowExistsFlag = GL_FALSE;
 201    }
 202    return 0;
 203 }
 204
 205 static GLboolean window_exists( XMesaDisplay *dpy, Window win )
 206 {
 207    XWindowAttributes wa;
 208    int (*old_handler)( XMesaDisplay*, XErrorEvent* );
 209    WindowExistsFlag = GL_TRUE;
 210    old_handler = XSetErrorHandler(window_exists_err_handler);
 211    XGetWindowAttributes( dpy, win, &wa ); /* dummy request */
 212    XSetErrorHandler(old_handler);
 213    return WindowExistsFlag;
 214 }
 215
 216 static Status
 217 get_drawable_size( XMesaDisplay *dpy, Drawable d, uint *width, uint *height )
 218 {
 219    Window root;
 220    Status stat;
 221    int xpos, ypos;
 222    unsigned int w, h, bw, depth;
 223    stat = XGetGeometry(dpy, d, &root, &xpos, &ypos, &w, &h, &bw, &depth);
 224    *width = w;
 225    *height = h;
 226    return stat;
 227 }
 228 #endif
 229
 230
 231 /**
 232  * Return the size of the window (or pixmap) that corresponds to the
 233  * given XMesaBuffer.
 234  * \param width  returns width in pixels
 235  * \param height  returns height in pixels
 236  */
 237 static void
 238 xmesa_get_window_size(XMesaDisplay *dpy, XMesaBuffer b,
 239                       GLuint *width, GLuint *height)
 240 {
 241 #ifdef XFree86Server
 242    *width = MIN2(b->drawable->width, MAX_WIDTH);
 243    *height = MIN2(b->drawable->height, MAX_HEIGHT);
 244 #else
 245    Status stat;
 246
 247    _glthread_LOCK_MUTEX(_xmesa_lock);
 248    XSync(b->xm_visual->display, 0); /* added for Chromium */
 249    stat = get_drawable_size(dpy, b->drawable, width, height);
 250    _glthread_UNLOCK_MUTEX(_xmesa_lock);
 251
 252    if (!stat) {
 253       /* probably querying a window that's recently been destroyed */
 254       _mesa_warning(NULL, "XGetGeometry failed!\n");
 255       *width = *height = 1;
 256    }
 257 #endif
 258 }
 259
 260
 261 /**
 262  * Choose the pixel format for the given visual.
 263  * This will tell the gallium driver how to pack pixel data into
 264  * drawing surfaces.
 265  */
 266 static GLuint
 267 choose_pixel_format(XMesaVisual v)
 268 {
 269    if (   GET_REDMASK(v)   == 0x0000ff
 270        && GET_GREENMASK(v) == 0x00ff00
 271        && GET_BLUEMASK(v)  == 0xff0000
 272        && v->BitsPerPixel == 32) {
 273       if (CHECK_BYTE_ORDER(v)) {
 274          /* no byteswapping needed */
 275          return 0 /* PIXEL_FORMAT_U_A8_B8_G8_R8 */;
 276       }
 277       else {
 278          return PIPE_FORMAT_R8G8B8A8_UNORM;
 279       }
 280    }
 281    else if (   GET_REDMASK(v)   == 0xff0000
 282             && GET_GREENMASK(v) == 0x00ff00
 283             && GET_BLUEMASK(v)  == 0x0000ff
 284             && v->BitsPerPixel == 32) {
 285       if (CHECK_BYTE_ORDER(v)) {
 286          /* no byteswapping needed */
 287          return PIPE_FORMAT_A8R8G8B8_UNORM;
 288       }
 289       else {
 290          return PIPE_FORMAT_B8G8R8A8_UNORM;
 291       }
 292    }
 293    else if (   GET_REDMASK(v)   == 0xf800
 294             && GET_GREENMASK(v) == 0x07e0
 295             && GET_BLUEMASK(v)  == 0x001f
 296             && CHECK_BYTE_ORDER(v)
 297             && v->BitsPerPixel == 16) {
 298       /* 5-6-5 RGB */
 299       return PIPE_FORMAT_R5G6B5_UNORM;
 300    }
 301
 302    assert(0);
 303    return 0;
 304 }
 305
 306
 307
 308 /**********************************************************************/
 309 /*****                Linked list of XMesaBuffers                 *****/
 310 /**********************************************************************/
 311
 312 XMesaBuffer XMesaBufferList = NULL;
 313
 314
 315 /**
 316  * Allocate a new XMesaBuffer object which corresponds to the given drawable.
 317  * Note that XMesaBuffer is derived from GLframebuffer.
 318  * The new XMesaBuffer will not have any size (Width=Height=0).
 319  *
 320  * \param d  the corresponding X drawable (window or pixmap)
 321  * \param type  either WINDOW, PIXMAP or PBUFFER, describing d
 322  * \param vis  the buffer's visual
 323  * \param cmap  the window's colormap, if known.
 324  * \return new XMesaBuffer or NULL if any problem
 325  */
 326 static XMesaBuffer
 327 create_xmesa_buffer(XMesaDrawable d, BufferType type,
 328                     XMesaVisual vis, XMesaColormap cmap)
 329 {
 330    XMesaBuffer b;
 331    GLframebuffer *fb;
 332    enum pipe_format colorFormat, depthFormat, stencilFormat;
 333    uint width, height;
 334
 335    ASSERT(type == WINDOW || type == PIXMAP || type == PBUFFER);
 336
 337    b = (XMesaBuffer) CALLOC_STRUCT(xmesa_buffer);
 338    if (!b)
 339       return NULL;
 340
 341    b->drawable = d;
 342
 343    b->xm_visual = vis;
 344    b->type = type;
 345    b->cmap = cmap;
 346
 347    /* determine PIPE_FORMATs for buffers */
 348    colorFormat = choose_pixel_format(vis);
 349
 350    if (vis->mesa_visual.depthBits == 0)
 351       depthFormat = PIPE_FORMAT_NONE;
 352    else if (vis->mesa_visual.depthBits <= 16)
 353       depthFormat = PIPE_FORMAT_Z16_UNORM;
 354    else if (vis->mesa_visual.depthBits <= 24)
 355       depthFormat = PIPE_FORMAT_S8Z24_UNORM;
 356    else
 357       depthFormat = PIPE_FORMAT_Z32_UNORM;
 358
 359    if (vis->mesa_visual.stencilBits == 8) {
 360       if (depthFormat == PIPE_FORMAT_S8Z24_UNORM)
 361          stencilFormat = depthFormat;
 362       else
 363          stencilFormat = PIPE_FORMAT_S8_UNORM;
 364    }
 365    else {
 366       stencilFormat = PIPE_FORMAT_NONE;
 367    }
 368
 369
 370    get_drawable_size(vis->display, d, &width, &height);
 371
 372    /*
 373     * Create framebuffer, but we'll plug in our own renderbuffers below.
 374     */
 375    b->stfb = st_create_framebuffer(&vis->mesa_visual,
 376                                    colorFormat, depthFormat, stencilFormat,
 377                                    width, height,
 378                                    (void *) b);
 379    fb = &b->stfb->Base;
 380
 381    /*
 382     * Create scratch XImage for xmesa_display_surface()
 383     */
 384    b->tempImage = XCreateImage(vis->display,
 385                                vis->visinfo->visual,
 386                                vis->visinfo->depth,
 387                                ZPixmap, 0,   /* format, offset */
 388                                NULL,         /* data */
 389                                0, 0,         /* size */
 390                                32,           /* bitmap_pad */
 391                                0);           /* bytes_per_line */
 392
 393    /* GLX_EXT_texture_from_pixmap */
 394    b->TextureTarget = 0;
 395    b->TextureFormat = GLX_TEXTURE_FORMAT_NONE_EXT;
 396    b->TextureMipmap = 0;
 397
 398    /* insert buffer into linked list */
 399    b->Next = XMesaBufferList;
 400    XMesaBufferList = b;
 401
 402    return b;
 403 }
 404
 405
 406 /**
 407  * Find an XMesaBuffer by matching X display and colormap but NOT matching
 408  * the notThis buffer.
 409  */
 410 XMesaBuffer
 411 xmesa_find_buffer(XMesaDisplay *dpy, XMesaColormap cmap, XMesaBuffer notThis)
 412 {
 413    XMesaBuffer b;
 414    for (b = XMesaBufferList; b; b = b->Next) {
 415       if (b->xm_visual->display == dpy &&
 416           b->cmap == cmap &&
 417           b != notThis) {
 418          return b;
 419       }
 420    }
 421    return NULL;
 422 }
 423
 424
 425 /**
 426  * Remove buffer from linked list, delete if no longer referenced.
 427  */
 428 static void
 429 xmesa_free_buffer(XMesaBuffer buffer)
 430 {
 431    XMesaBuffer prev = NULL, b;
 432
 433    for (b = XMesaBufferList; b; b = b->Next) {
 434       if (b == buffer) {
 435          struct gl_framebuffer *fb = &buffer->stfb->Base;
 436
 437          /* unlink buffer from list */
 438          if (prev)
 439             prev->Next = buffer->Next;
 440          else
 441             XMesaBufferList = buffer->Next;
 442
 443          /* mark as delete pending */
 444          fb->DeletePending = GL_TRUE;
 445
 446          /* Since the X window for the XMesaBuffer is going away, we don't
 447           * want to dereference this pointer in the future.
 448           */
 449          b->drawable = 0;
 450
 451          buffer->tempImage->data = NULL;
 452          XDestroyImage(buffer->tempImage);
 453
 454          /* Unreference.  If count = zero we'll really delete the buffer */
 455          _mesa_unreference_framebuffer(&fb);
 456
 457          XFreeGC(b->xm_visual->display, b->gc);
 458
 459          free(buffer);
 460
 461          return;
 462       }
 463       /* continue search */
 464       prev = b;
 465    }
 466    /* buffer not found in XMesaBufferList */
 467    _mesa_problem(NULL,"xmesa_free_buffer() - buffer not found\n");
 468 }
 469
 470
 471
 472 /**********************************************************************/
 473 /*****                   Misc Private Functions                   *****/
 474 /**********************************************************************/
 475
 476
 477 /**
 478  * When a context is bound for the first time, we can finally finish
 479  * initializing the context's visual and buffer information.
 480  * \param v  the XMesaVisual to initialize
 481  * \param b  the XMesaBuffer to initialize (may be NULL)
 482  * \param rgb_flag  TRUE = RGBA mode, FALSE = color index mode
 483  * \param window  the window/pixmap we're rendering into
 484  * \param cmap  the colormap associated with the window/pixmap
 485  * \return GL_TRUE=success, GL_FALSE=failure
 486  */
 487 static GLboolean
 488 initialize_visual_and_buffer(XMesaVisual v, XMesaBuffer b,
 489                              GLboolean rgb_flag, XMesaDrawable window,
 490                              XMesaColormap cmap)
 491 {
 492 #ifdef XFree86Server
 493    int client = (window) ? CLIENT_ID(window->id) : 0;
 494 #endif
 495
 496    ASSERT(!b || b->xm_visual == v);
 497
 498    /* Save true bits/pixel */
 499    v->BitsPerPixel = bits_per_pixel(v);
 500    assert(v->BitsPerPixel > 0);
 501
 502    if (rgb_flag == GL_FALSE) {
 503       /* COLOR-INDEXED WINDOW: not supported*/
 504       return GL_FALSE;
 505    }
 506    else {
 507       /* RGB WINDOW:
 508        * We support RGB rendering into almost any kind of visual.
 509        */
 510       const int xclass = v->mesa_visual.visualType;
 511       if (xclass != GLX_TRUE_COLOR && xclass == !GLX_DIRECT_COLOR) {
 512          _mesa_warning(NULL,
 513             "XMesa: RGB mode rendering not supported in given visual.\n");
 514          return GL_FALSE;
 515       }
 516       v->mesa_visual.indexBits = 0;
 517
 518       if (v->BitsPerPixel == 32) {
 519          /* We use XImages for all front/back buffers.  If an X Window or
 520           * X Pixmap is 32bpp, there's no guarantee that the alpha channel
 521           * will be preserved.  For XImages we're in luck.
 522           */
 523          v->mesa_visual.alphaBits = 8;
 524       }
 525    }
 526
 527    /*
 528     * If MESA_INFO env var is set print out some debugging info
 529     * which can help Brian figure out what's going on when a user
 530     * reports bugs.
 531     */
 532    if (_mesa_getenv("MESA_INFO")) {
 533       _mesa_printf("X/Mesa visual = %p\n", (void *) v);
 534       _mesa_printf("X/Mesa level = %d\n", v->mesa_visual.level);
 535       _mesa_printf("X/Mesa depth = %d\n", GET_VISUAL_DEPTH(v));
 536       _mesa_printf("X/Mesa bits per pixel = %d\n", v->BitsPerPixel);
 537    }
 538
 539    if (b && window) {
 540       /* these should have been set in create_xmesa_buffer */
 541       ASSERT(b->drawable == window);
 542
 543       /* Setup for single/double buffering */
 544       if (v->mesa_visual.doubleBufferMode) {
 545          /* Double buffered */
 546          b->shm = xmesa_check_for_xshm( v->display );
 547       }
 548
 549       /* X11 graphics context */
 550 #ifdef XFree86Server
 551       b->gc = CreateScratchGC(v->display, window->depth);
 552 #else
 553       b->gc = XCreateGC( v->display, window, 0, NULL );
 554 #endif
 555       XMesaSetFunction( v->display, b->gc, GXcopy );
 556    }
 557
 558    return GL_TRUE;
 559 }
 560
 561
 562
 563 #define NUM_VISUAL_TYPES   6
 564
 565 /**
 566  * Convert an X visual type to a GLX visual type.
 567  *
 568  * \param visualType X visual type (i.e., \c TrueColor, \c StaticGray, etc.)
 569  *        to be converted.
 570  * \return If \c visualType is a valid X visual type, a GLX visual type will
 571  *         be returned.  Otherwise \c GLX_NONE will be returned.
 572  *
 573  * \note
 574  * This code was lifted directly from lib/GL/glx/glcontextmodes.c in the
 575  * DRI CVS tree.
 576  */
 577 static GLint
 578 xmesa_convert_from_x_visual_type( int visualType )
 579 {
 580     static const int glx_visual_types[ NUM_VISUAL_TYPES ] = {
 581         GLX_STATIC_GRAY,  GLX_GRAY_SCALE,
 582         GLX_STATIC_COLOR, GLX_PSEUDO_COLOR,
 583         GLX_TRUE_COLOR,   GLX_DIRECT_COLOR
 584     };
 585
 586     return ( (unsigned) visualType < NUM_VISUAL_TYPES )
 587         ? glx_visual_types[ visualType ] : GLX_NONE;
 588 }
 589
 590
 591 /**********************************************************************/
 592 /*****                       Public Functions                     *****/
 593 /**********************************************************************/
 594
 595
 596 /*
 597  * Create a new X/Mesa visual.
 598  * Input:  display - X11 display
 599  *         visinfo - an XVisualInfo pointer
 600  *         rgb_flag - GL_TRUE = RGB mode,
 601  *                    GL_FALSE = color index mode
 602  *         alpha_flag - alpha buffer requested?
 603  *         db_flag - GL_TRUE = double-buffered,
 604  *                   GL_FALSE = single buffered
 605  *         stereo_flag - stereo visual?
 606  *         ximage_flag - GL_TRUE = use an XImage for back buffer,
 607  *                       GL_FALSE = use an off-screen pixmap for back buffer
 608  *         depth_size - requested bits/depth values, or zero
 609  *         stencil_size - requested bits/stencil values, or zero
 610  *         accum_red_size - requested bits/red accum values, or zero
 611  *         accum_green_size - requested bits/green accum values, or zero
 612  *         accum_blue_size - requested bits/blue accum values, or zero
 613  *         accum_alpha_size - requested bits/alpha accum values, or zero
 614  *         num_samples - number of samples/pixel if multisampling, or zero
 615  *         level - visual level, usually 0
 616  *         visualCaveat - ala the GLX extension, usually GLX_NONE
 617  * Return;  a new XMesaVisual or 0 if error.
 618  */
 619 PUBLIC
 620 XMesaVisual XMesaCreateVisual( XMesaDisplay *display,
 621                                XMesaVisualInfo visinfo,
 622                                GLboolean rgb_flag,
 623                                GLboolean alpha_flag,
 624                                GLboolean db_flag,
 625                                GLboolean stereo_flag,
 626                                GLboolean ximage_flag,
 627                                GLint depth_size,
 628                                GLint stencil_size,
 629                                GLint accum_red_size,
 630                                GLint accum_green_size,
 631                                GLint accum_blue_size,
 632                                GLint accum_alpha_size,
 633                                GLint num_samples,
 634                                GLint level,
 635                                GLint visualCaveat )
 636 {
 637    XMesaVisual v;
 638    GLint red_bits, green_bits, blue_bits, alpha_bits;
 639
 640 #ifndef XFree86Server
 641    /* For debugging only */
 642    if (_mesa_getenv("MESA_XSYNC")) {
 643       /* This makes debugging X easier.
 644        * In your debugger, set a breakpoint on _XError to stop when an
 645        * X protocol error is generated.
 646        */
 647       XSynchronize( display, 1 );
 648    }
 649 #endif
 650
 651    v = (XMesaVisual) CALLOC_STRUCT(xmesa_visual);
 652    if (!v) {
 653       return NULL;
 654    }
 655
 656    v->display = display;
 657
 658    /* Save a copy of the XVisualInfo struct because the user may X_mesa_free()
 659     * the struct but we may need some of the information contained in it
 660     * at a later time.
 661     */
 662 #ifndef XFree86Server
 663    v->visinfo = (XVisualInfo *) MALLOC(sizeof(*visinfo));
 664    if(!v->visinfo) {
 665       _mesa_free(v);
 666       return NULL;
 667    }
 668    MEMCPY(v->visinfo, visinfo, sizeof(*visinfo));
 669 #endif
 670
 671    v->ximage_flag = ximage_flag;
 672
 673 #ifdef XFree86Server
 674    /* We could calculate these values by ourselves.  nplanes is either the sum
 675     * of the red, green, and blue bits or the number index bits.
 676     * ColormapEntries is either (1U << index_bits) or
 677     * (1U << max(redBits, greenBits, blueBits)).
 678     */
 679    assert(visinfo->nplanes > 0);
 680    v->nplanes = visinfo->nplanes;
 681    v->ColormapEntries = visinfo->ColormapEntries;
 682
 683    v->mesa_visual.redMask = visinfo->redMask;
 684    v->mesa_visual.greenMask = visinfo->greenMask;
 685    v->mesa_visual.blueMask = visinfo->blueMask;
 686    v->mesa_visual.visualID = visinfo->vid;
 687    v->mesa_visual.screen = 0; /* FIXME: What should be done here? */
 688 #else
 689    v->mesa_visual.redMask = visinfo->red_mask;
 690    v->mesa_visual.greenMask = visinfo->green_mask;
 691    v->mesa_visual.blueMask = visinfo->blue_mask;
 692    v->mesa_visual.visualID = visinfo->visualid;
 693    v->mesa_visual.screen = visinfo->screen;
 694 #endif
 695
 696 #if defined(XFree86Server) || !(defined(__cplusplus) || defined(c_plusplus))
 697    v->mesa_visual.visualType = xmesa_convert_from_x_visual_type(visinfo->class);
 698 #else
 699    v->mesa_visual.visualType = xmesa_convert_from_x_visual_type(visinfo->c_class);
 700 #endif
 701
 702    v->mesa_visual.visualRating = visualCaveat;
 703
 704    if (alpha_flag)
 705       v->mesa_visual.alphaBits = 8;
 706
 707    (void) initialize_visual_and_buffer( v, NULL, rgb_flag, 0, 0 );
 708
 709    {
 710       const int xclass = v->mesa_visual.visualType;
 711       if (xclass == GLX_TRUE_COLOR || xclass == GLX_DIRECT_COLOR) {
 712          red_bits   = _mesa_bitcount(GET_REDMASK(v));
 713          green_bits = _mesa_bitcount(GET_GREENMASK(v));
 714          blue_bits  = _mesa_bitcount(GET_BLUEMASK(v));
 715       }
 716       else {
 717          /* this is an approximation */
 718          int depth;
 719          depth = GET_VISUAL_DEPTH(v);
 720          red_bits = depth / 3;
 721          depth -= red_bits;
 722          green_bits = depth / 2;
 723          depth -= green_bits;
 724          blue_bits = depth;
 725          alpha_bits = 0;
 726          assert( red_bits + green_bits + blue_bits == GET_VISUAL_DEPTH(v) );
 727       }
 728       alpha_bits = v->mesa_visual.alphaBits;
 729    }
 730
 731    _mesa_initialize_visual( &v->mesa_visual,
 732                             rgb_flag, db_flag, stereo_flag,
 733                             red_bits, green_bits,
 734                             blue_bits, alpha_bits,
 735                             v->mesa_visual.indexBits,
 736                             depth_size,
 737                             stencil_size,
 738                             accum_red_size, accum_green_size,
 739                             accum_blue_size, accum_alpha_size,
 740                             0 );
 741
 742    /* XXX minor hack */
 743    v->mesa_visual.level = level;
 744    return v;
 745 }
 746
 747
 748 PUBLIC
 749 void XMesaDestroyVisual( XMesaVisual v )
 750 {
 751 #ifndef XFree86Server
 752    _mesa_free(v->visinfo);
 753 #endif
 754    _mesa_free(v);
 755 }
 756
 757
 758
 759 /**
 760  * Create a new XMesaContext.
 761  * \param v  the XMesaVisual
 762  * \param share_list  another XMesaContext with which to share display
 763  *                    lists or NULL if no sharing is wanted.
 764  * \return an XMesaContext or NULL if error.
 765  */
 766 PUBLIC
 767 XMesaContext XMesaCreateContext( XMesaVisual v, XMesaContext share_list )
 768 {
 769    static GLboolean firstTime = GL_TRUE;
 770    struct pipe_context *pipe;
 771    XMesaContext c;
 772    GLcontext *mesaCtx;
 773    uint pf;
 774
 775    if (firstTime) {
 776       _glthread_INIT_MUTEX(_xmesa_lock);
 777       firstTime = GL_FALSE;
 778    }
 779
 780    /* Note: the XMesaContext contains a Mesa GLcontext struct (inheritance) */
 781    c = (XMesaContext) CALLOC_STRUCT(xmesa_context);
 782    if (!c)
 783       return NULL;
 784
 785    pf = choose_pixel_format(v);
 786    assert(pf);
 787
 788    c->xm_visual = v;
 789    c->xm_buffer = NULL;   /* set later by XMesaMakeCurrent */
 790
 791    if (!getenv("XM_AUB")) {
 792       xmesa_mode = XMESA_SOFTPIPE;
 793       pipe = xmesa_create_pipe_context( c, pf );
 794    }
 795    else {
 796       xmesa_mode = XMESA_AUB;
 797       pipe = xmesa_create_i965simple(xmesa_get_pipe_winsys_aub(v));
 798    }
 799
 800    if (pipe == NULL)
 801       goto fail;
 802
 803    c->st = st_create_context(pipe, &v->mesa_visual,
 804                              share_list ? share_list->st : NULL);
 805    if (c->st == NULL)
 806       goto fail;
 807
 808    mesaCtx = c->st->ctx;
 809    c->st->ctx->DriverCtx = c;
 810
 811 #if 00
 812    _mesa_enable_sw_extensions(mesaCtx);
 813    _mesa_enable_1_3_extensions(mesaCtx);
 814    _mesa_enable_1_4_extensions(mesaCtx);
 815    _mesa_enable_1_5_extensions(mesaCtx);
 816    _mesa_enable_2_0_extensions(mesaCtx);
 817 #endif
 818
 819 #ifdef XFree86Server
 820    /* If we're running in the X server, do bounds checking to prevent
 821     * segfaults and server crashes!
 822     */
 823    mesaCtx->Const.CheckArrayBounds = GL_TRUE;
 824 #endif
 825
 826    return c;
 827
 828  fail:
 829    if (c->st)
 830       st_destroy_context(c->st);
 831    if (pipe)
 832       pipe->destroy(pipe);
 833    FREE(c);
 834    return NULL;
 835 }
 836
 837
 838
 839 PUBLIC
 840 void XMesaDestroyContext( XMesaContext c )
 841 {
 842    st_destroy_context(c->st);
 843    _mesa_free(c);
 844 }
 845
 846
 847
 848 /**
 849  * Private function for creating an XMesaBuffer which corresponds to an
 850  * X window or pixmap.
 851  * \param v  the window's XMesaVisual
 852  * \param w  the window we're wrapping
 853  * \return  new XMesaBuffer or NULL if error
 854  */
 855 PUBLIC XMesaBuffer
 856 XMesaCreateWindowBuffer(XMesaVisual v, XMesaWindow w)
 857 {
 858 #ifndef XFree86Server
 859    XWindowAttributes attr;
 860 #endif
 861    XMesaBuffer b;
 862    XMesaColormap cmap;
 863    int depth;
 864
 865    assert(v);
 866    assert(w);
 867
 868    /* Check that window depth matches visual depth */
 869 #ifdef XFree86Server
 870    depth = ((XMesaDrawable)w)->depth;
 871 #else
 872    XGetWindowAttributes( v->display, w, &attr );
 873    depth = attr.depth;
 874 #endif
 875    if (GET_VISUAL_DEPTH(v) != depth) {
 876       _mesa_warning(NULL, "XMesaCreateWindowBuffer: depth mismatch between visual (%d) and window (%d)!\n",
 877                     GET_VISUAL_DEPTH(v), depth);
 878       return NULL;
 879    }
 880
 881    /* Find colormap */
 882 #ifdef XFree86Server
 883    cmap = (ColormapPtr)LookupIDByType(wColormap(w), RT_COLORMAP);
 884 #else
 885    if (attr.colormap) {
 886       cmap = attr.colormap;
 887    }
 888    else {
 889       _mesa_warning(NULL, "Window %u has no colormap!\n", (unsigned int) w);
 890       /* this is weird, a window w/out a colormap!? */
 891       /* OK, let's just allocate a new one and hope for the best */
 892       cmap = XCreateColormap(v->display, w, attr.visual, AllocNone);
 893    }
 894 #endif
 895
 896    b = create_xmesa_buffer((XMesaDrawable) w, WINDOW, v, cmap);
 897    if (!b)
 898       return NULL;
 899
 900    if (!initialize_visual_and_buffer( v, b, v->mesa_visual.rgbMode,
 901                                       (XMesaDrawable) w, cmap )) {
 902       xmesa_free_buffer(b);
 903       return NULL;
 904    }
 905
 906    return b;
 907 }
 908
 909
 910
 911 /**
 912  * Create a new XMesaBuffer from an X pixmap.
 913  *
 914  * \param v    the XMesaVisual
 915  * \param p    the pixmap
 916  * \param cmap the colormap, may be 0 if using a \c GLX_TRUE_COLOR or
 917  *             \c GLX_DIRECT_COLOR visual for the pixmap
 918  * \returns new XMesaBuffer or NULL if error
 919  */
 920 PUBLIC XMesaBuffer
 921 XMesaCreatePixmapBuffer(XMesaVisual v, XMesaPixmap p, XMesaColormap cmap)
 922 {
 923    XMesaBuffer b;
 924
 925    assert(v);
 926
 927    b = create_xmesa_buffer((XMesaDrawable) p, PIXMAP, v, cmap);
 928    if (!b)
 929       return NULL;
 930
 931    if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
 932                                      (XMesaDrawable) p, cmap)) {
 933       xmesa_free_buffer(b);
 934       return NULL;
 935    }
 936
 937    return b;
 938 }
 939
 940
 941 /**
 942  * For GLX_EXT_texture_from_pixmap
 943  */
 944 XMesaBuffer
 945 XMesaCreatePixmapTextureBuffer(XMesaVisual v, XMesaPixmap p,
 946                                XMesaColormap cmap,
 947                                int format, int target, int mipmap)
 948 {
 949    GET_CURRENT_CONTEXT(ctx);
 950    XMesaBuffer b;
 951    GLuint width, height;
 952
 953    assert(v);
 954
 955    b = create_xmesa_buffer((XMesaDrawable) p, PIXMAP, v, cmap);
 956    if (!b)
 957       return NULL;
 958
 959    /* get pixmap size, update framebuffer/renderbuffer dims */
 960    xmesa_get_window_size(v->display, b, &width, &height);
 961    _mesa_resize_framebuffer(NULL, &(b->stfb->Base), width, height);
 962
 963    if (target == 0) {
 964       /* examine dims */
 965       if (ctx->Extensions.ARB_texture_non_power_of_two) {
 966          target = GLX_TEXTURE_2D_EXT;
 967       }
 968       else if (   _mesa_bitcount(width)  == 1
 969                && _mesa_bitcount(height) == 1) {
 970          /* power of two size */
 971          if (height == 1) {
 972             target = GLX_TEXTURE_1D_EXT;
 973          }
 974          else {
 975             target = GLX_TEXTURE_2D_EXT;
 976          }
 977       }
 978       else if (ctx->Extensions.NV_texture_rectangle) {
 979          target = GLX_TEXTURE_RECTANGLE_EXT;
 980       }
 981       else {
 982          /* non power of two textures not supported */
 983          XMesaDestroyBuffer(b);
 984          return 0;
 985       }
 986    }
 987
 988    b->TextureTarget = target;
 989    b->TextureFormat = format;
 990    b->TextureMipmap = mipmap;
 991
 992    if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
 993                                      (XMesaDrawable) p, cmap)) {
 994       xmesa_free_buffer(b);
 995       return NULL;
 996    }
 997
 998    return b;
 999 }
1000
1001
1002
1003 XMesaBuffer
1004 XMesaCreatePBuffer(XMesaVisual v, XMesaColormap cmap,
1005                    unsigned int width, unsigned int height)
1006 {
1007 #ifndef XFree86Server
1008    XMesaWindow root;
1009    XMesaDrawable drawable;  /* X Pixmap Drawable */
1010    XMesaBuffer b;
1011
1012    /* allocate pixmap for front buffer */
1013    root = RootWindow( v->display, v->visinfo->screen );
1014    drawable = XCreatePixmap(v->display, root, width, height,
1015                             v->visinfo->depth);
1016    if (!drawable)
1017       return NULL;
1018
1019    b = create_xmesa_buffer(drawable, PBUFFER, v, cmap);
1020    if (!b)
1021       return NULL;
1022
1023    if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
1024                                      drawable, cmap)) {
1025       xmesa_free_buffer(b);
1026       return NULL;
1027    }
1028
1029    return b;
1030 #else
1031    return 0;
1032 #endif
1033 }
1034
1035
1036
1037 /*
1038  * Deallocate an XMesaBuffer structure and all related info.
1039  */
1040 PUBLIC void
1041 XMesaDestroyBuffer(XMesaBuffer b)
1042 {
1043    xmesa_free_buffer(b);
1044 }
1045
1046
1047 /**
1048  * Query the current window size and update the corresponding GLframebuffer
1049  * and all attached renderbuffers.
1050  * Called when:
1051  *  1. the first time a buffer is bound to a context.
1052  *  2. from the XMesaResizeBuffers() API function.
1053  *  3. SwapBuffers.  XXX probabaly from xm_flush_frontbuffer() too...
1054  * Note: it's possible (and legal) for xmctx to be NULL.  That can happen
1055  * when resizing a buffer when no rendering context is bound.
1056  */
1057 void
1058 xmesa_check_and_update_buffer_size(XMesaContext xmctx, XMesaBuffer drawBuffer)
1059 {
1060    GLuint width, height;
1061    xmesa_get_window_size(drawBuffer->xm_visual->display, drawBuffer, &width, &height);
1062    st_resize_framebuffer(drawBuffer->stfb, width, height);
1063 }
1064
1065
1066 /*
1067  * Bind buffer b to context c and make c the current rendering context.
1068  */
1069 GLboolean XMesaMakeCurrent( XMesaContext c, XMesaBuffer b )
1070 {
1071    return XMesaMakeCurrent2( c, b, b );
1072 }
1073
1074
1075 /*
1076  * Bind buffer b to context c and make c the current rendering context.
1077  */
1078 PUBLIC
1079 GLboolean XMesaMakeCurrent2( XMesaContext c, XMesaBuffer drawBuffer,
1080                              XMesaBuffer readBuffer )
1081 {
1082    if (c) {
1083       if (!drawBuffer || !readBuffer)
1084          return GL_FALSE;  /* must specify buffers! */
1085
1086 #if 0
1087       /* XXX restore this optimization */
1088       if (&(c->mesa) == _mesa_get_current_context()
1089           && c->mesa.DrawBuffer == &drawBuffer->mesa_buffer
1090           && c->mesa.ReadBuffer == &readBuffer->mesa_buffer
1091           && xmesa_buffer(c->mesa.DrawBuffer)->wasCurrent) {
1092          /* same context and buffer, do nothing */
1093          return GL_TRUE;
1094       }
1095 #endif
1096
1097       c->xm_buffer = drawBuffer;
1098
1099       /* Call this periodically to detect when the user has begun using
1100        * GL rendering from multiple threads.
1101        */
1102       _glapi_check_multithread();
1103
1104       st_make_current(c->st, drawBuffer->stfb, readBuffer->stfb);
1105
1106       xmesa_check_and_update_buffer_size(c, drawBuffer);
1107       if (readBuffer != drawBuffer)
1108          xmesa_check_and_update_buffer_size(c, readBuffer);
1109
1110       /* Solution to Stephane Rehel's problem with glXReleaseBuffersMESA(): */
1111       drawBuffer->wasCurrent = GL_TRUE;
1112    }
1113    else {
1114       /* Detach */
1115       st_make_current( NULL, NULL, NULL );
1116    }
1117    return GL_TRUE;
1118 }
1119
1120
1121 /*
1122  * Unbind the context c from its buffer.
1123  */
1124 GLboolean XMesaUnbindContext( XMesaContext c )
1125 {
1126    /* A no-op for XFree86 integration purposes */
1127    return GL_TRUE;
1128 }
1129
1130
1131 XMesaContext XMesaGetCurrentContext( void )
1132 {
1133    GET_CURRENT_CONTEXT(ctx);
1134    if (ctx) {
1135       XMesaContext xmesa = xmesa_context(ctx);
1136       return xmesa;
1137    }
1138    else {
1139       return 0;
1140    }
1141 }
1142
1143
1144 XMesaBuffer XMesaGetCurrentBuffer( void )
1145 {
1146    GET_CURRENT_CONTEXT(ctx);
1147    if (ctx) {
1148       XMesaBuffer xmbuf = xmesa_buffer(ctx->DrawBuffer);
1149       return xmbuf;
1150    }
1151    else {
1152       return 0;
1153    }
1154 }
1155
1156
1157 /* New in Mesa 3.1 */
1158 XMesaBuffer XMesaGetCurrentReadBuffer( void )
1159 {
1160    GET_CURRENT_CONTEXT(ctx);
1161    if (ctx) {
1162       return xmesa_buffer(ctx->ReadBuffer);
1163    }
1164    else {
1165       return 0;
1166    }
1167 }
1168
1169
1170 #ifdef XFree86Server
1171 PUBLIC
1172 GLboolean XMesaForceCurrent(XMesaContext c)
1173 {
1174    if (c) {
1175       _glapi_set_dispatch(c->mesa.CurrentDispatch);
1176
1177       if (&(c->mesa) != _mesa_get_current_context()) {
1178          _mesa_make_current(&c->mesa, c->mesa.DrawBuffer, c->mesa.ReadBuffer);
1179       }
1180    }
1181    else {
1182       _mesa_make_current(NULL, NULL, NULL);
1183    }
1184    return GL_TRUE;
1185 }
1186
1187
1188 PUBLIC
1189 GLboolean XMesaLoseCurrent(XMesaContext c)
1190 {
1191    (void) c;
1192    _mesa_make_current(NULL, NULL, NULL);
1193    return GL_TRUE;
1194 }
1195
1196
1197 PUBLIC
1198 GLboolean XMesaCopyContext( XMesaContext xm_src, XMesaContext xm_dst, GLuint mask )
1199 {
1200    _mesa_copy_context(&xm_src->mesa, &xm_dst->mesa, mask);
1201    return GL_TRUE;
1202 }
1203 #endif /* XFree86Server */
1204
1205
1206 #ifndef FX
1207 GLboolean XMesaSetFXmode( GLint mode )
1208 {
1209    (void) mode;
1210    return GL_FALSE;
1211 }
1212 #endif
1213
1214
1215
1216 /*
1217  * Copy the back buffer to the front buffer.  If there's no back buffer
1218  * this is a no-op.
1219  */
1220 PUBLIC
1221 void XMesaSwapBuffers( XMesaBuffer b )
1222 {
1223    struct pipe_surface *surf;
1224
1225    /* If we're swapping the buffer associated with the current context
1226     * we have to flush any pending rendering commands first.
1227     */
1228    st_notify_swapbuffers(b->stfb);
1229
1230    surf = st_get_framebuffer_surface(b->stfb, ST_SURFACE_BACK_LEFT);
1231    if (surf) {
1232       if (xmesa_mode == XMESA_AUB)
1233          xmesa_display_aub( surf );
1234       else
1235          xmesa_display_surface(b, surf);
1236    }
1237
1238    xmesa_check_and_update_buffer_size(NULL, b);
1239 }
1240
1241
1242
1243 /*
1244  * Copy sub-region of back buffer to front buffer
1245  */
1246 void XMesaCopySubBuffer( XMesaBuffer b, int x, int y, int width, int height )
1247 {
1248    struct pipe_surface *surf_front
1249       = st_get_framebuffer_surface(b->stfb, ST_SURFACE_FRONT_LEFT);
1250    struct pipe_surface *surf_back
1251       = st_get_framebuffer_surface(b->stfb, ST_SURFACE_BACK_LEFT);
1252    struct pipe_context *pipe = NULL; /* XXX fix */
1253
1254    if (!surf_front || !surf_back)
1255       return;
1256
1257    pipe->surface_copy(pipe,
1258                       FALSE,
1259                       surf_front, x, y,  /* dest */
1260                       surf_back, x, y,   /* src */
1261                       width, height);
1262 }
1263
1264
1265
1266 /*
1267  * Return the depth buffer associated with an XMesaBuffer.
1268  * Input:  b - the XMesa buffer handle
1269  * Output:  width, height - size of buffer in pixels
1270  *          bytesPerValue - bytes per depth value (2 or 4)
1271  *          buffer - pointer to depth buffer values
1272  * Return:  GL_TRUE or GL_FALSE to indicate success or failure.
1273  */
1274 GLboolean XMesaGetDepthBuffer( XMesaBuffer b, GLint *width, GLint *height,
1275                                GLint *bytesPerValue, void **buffer )
1276 {
1277    *width = 0;
1278    *height = 0;
1279    *bytesPerValue = 0;
1280    *buffer = 0;
1281    return GL_FALSE;
1282 }
1283
1284
1285 void XMesaFlush( XMesaContext c )
1286 {
1287    if (c && c->xm_visual->display) {
1288 #ifdef XFree86Server
1289       /* NOT_NEEDED */
1290 #else
1291       XSync( c->xm_visual->display, False );
1292 #endif
1293    }
1294 }
1295
1296
1297
1298 const char *XMesaGetString( XMesaContext c, int name )
1299 {
1300    (void) c;
1301    if (name==XMESA_VERSION) {
1302       return "5.0";
1303    }
1304    else if (name==XMESA_EXTENSIONS) {
1305       return "";
1306    }
1307    else {
1308       return NULL;
1309    }
1310 }
1311
1312
1313
1314 XMesaBuffer XMesaFindBuffer( XMesaDisplay *dpy, XMesaDrawable d )
1315 {
1316    XMesaBuffer b;
1317    for (b=XMesaBufferList; b; b=b->Next) {
1318       if (b->drawable == d && b->xm_visual->display == dpy) {
1319          return b;
1320       }
1321    }
1322    return NULL;
1323 }
1324
1325
1326 /**
1327  * Free/destroy all XMesaBuffers associated with given display.
1328  */
1329 void xmesa_destroy_buffers_on_display(XMesaDisplay *dpy)
1330 {
1331    XMesaBuffer b, next;
1332    for (b = XMesaBufferList; b; b = next) {
1333       next = b->Next;
1334       if (b->xm_visual->display == dpy) {
1335          xmesa_free_buffer(b);
1336       }
1337    }
1338 }
1339
1340
1341 /*
1342  * Look for XMesaBuffers whose X window has been destroyed.
1343  * Deallocate any such XMesaBuffers.
1344  */
1345 void XMesaGarbageCollect( void )
1346 {
1347    XMesaBuffer b, next;
1348    for (b=XMesaBufferList; b; b=next) {
1349       next = b->Next;
1350       if (b->xm_visual &&
1351           b->xm_visual->display &&
1352           b->drawable &&
1353           b->type == WINDOW) {
1354 #ifdef XFree86Server
1355          /* NOT_NEEDED */
1356 #else
1357          XSync(b->xm_visual->display, False);
1358          if (!window_exists( b->xm_visual->display, b->drawable )) {
1359             /* found a dead window, free the ancillary info */
1360             XMesaDestroyBuffer( b );
1361          }
1362 #endif
1363       }
1364    }
1365 }
1366
1367
1368 unsigned long XMesaDitherColor( XMesaContext xmesa, GLint x, GLint y,
1369                                 GLfloat red, GLfloat green,
1370                                 GLfloat blue, GLfloat alpha )
1371 {
1372    /* no longer supported */
1373    return 0;
1374 }
1375
1376
1377 /*
1378  * This is typically called when the window size changes and we need
1379  * to reallocate the buffer's back/depth/stencil/accum buffers.
1380  */
1381 PUBLIC void
1382 XMesaResizeBuffers( XMesaBuffer b )
1383 {
1384    GET_CURRENT_CONTEXT(ctx);
1385    XMesaContext xmctx = xmesa_context(ctx);
1386    if (!xmctx)
1387       return;
1388    xmesa_check_and_update_buffer_size(xmctx, b);
1389 }
1390
1391
1392
1393
1394 PUBLIC void
1395 XMesaBindTexImage(XMesaDisplay *dpy, XMesaBuffer drawable, int buffer,
1396                   const int *attrib_list)
1397 {
1398 }
1399
1400
1401
1402 PUBLIC void
1403 XMesaReleaseTexImage(XMesaDisplay *dpy, XMesaBuffer drawable, int buffer)
1404 {
1405 }
1406