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
  66 #include "state_tracker/st_public.h"
  67 #include "state_tracker/st_context.h"
  68 #include "pipe/p_defines.h"
  69 #include "pipe/p_screen.h"
  70 #include "pipe/p_context.h"
  71
  72 #include "xm_winsys_aub.h"
  73
  74 /**
  75  * Global X driver lock
  76  */
  77 pipe_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    pipe_mutex_lock(_xmesa_lock);
 248    XSync(b->xm_visual->display, 0); /* added for Chromium */
 249    stat = get_drawable_size(dpy, b->drawable, width, height);
 250    pipe_mutex_unlock(_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 #ifdef GALLIUM_CELL /* XXX temporary for Cell! */
 353    else
 354       depthFormat = PIPE_FORMAT_S8Z24_UNORM;
 355 #else
 356    else if (vis->mesa_visual.depthBits <= 16)
 357       depthFormat = PIPE_FORMAT_Z16_UNORM;
 358    else if (vis->mesa_visual.depthBits <= 24)
 359       depthFormat = PIPE_FORMAT_S8Z24_UNORM;
 360    else
 361       depthFormat = PIPE_FORMAT_Z32_UNORM;
 362 #endif
 363
 364    if (vis->mesa_visual.stencilBits == 8) {
 365       if (depthFormat == PIPE_FORMAT_S8Z24_UNORM)
 366          stencilFormat = depthFormat;
 367       else
 368          stencilFormat = PIPE_FORMAT_S8_UNORM;
 369    }
 370    else {
 371       /* no stencil */
 372       stencilFormat = PIPE_FORMAT_NONE;
 373       if (depthFormat == PIPE_FORMAT_S8Z24_UNORM) {
 374          /* use 24-bit Z, undefined stencil channel */
 375          depthFormat = PIPE_FORMAT_X8Z24_UNORM;
 376       }
 377    }
 378
 379
 380    get_drawable_size(vis->display, d, &width, &height);
 381
 382    /*
 383     * Create framebuffer, but we'll plug in our own renderbuffers below.
 384     */
 385    b->stfb = st_create_framebuffer(&vis->mesa_visual,
 386                                    colorFormat, depthFormat, stencilFormat,
 387                                    width, height,
 388                                    (void *) b);
 389    fb = &b->stfb->Base;
 390
 391    /*
 392     * Create scratch XImage for xmesa_display_surface()
 393     */
 394    b->tempImage = XCreateImage(vis->display,
 395                                vis->visinfo->visual,
 396                                vis->visinfo->depth,
 397                                ZPixmap, 0,   /* format, offset */
 398                                NULL,         /* data */
 399                                0, 0,         /* size */
 400                                32,           /* bitmap_pad */
 401                                0);           /* bytes_per_line */
 402
 403    /* GLX_EXT_texture_from_pixmap */
 404    b->TextureTarget = 0;
 405    b->TextureFormat = GLX_TEXTURE_FORMAT_NONE_EXT;
 406    b->TextureMipmap = 0;
 407
 408    /* insert buffer into linked list */
 409    b->Next = XMesaBufferList;
 410    XMesaBufferList = b;
 411
 412    return b;
 413 }
 414
 415
 416 /**
 417  * Find an XMesaBuffer by matching X display and colormap but NOT matching
 418  * the notThis buffer.
 419  */
 420 XMesaBuffer
 421 xmesa_find_buffer(XMesaDisplay *dpy, XMesaColormap cmap, XMesaBuffer notThis)
 422 {
 423    XMesaBuffer b;
 424    for (b = XMesaBufferList; b; b = b->Next) {
 425       if (b->xm_visual->display == dpy &&
 426           b->cmap == cmap &&
 427           b != notThis) {
 428          return b;
 429       }
 430    }
 431    return NULL;
 432 }
 433
 434
 435 /**
 436  * Remove buffer from linked list, delete if no longer referenced.
 437  */
 438 static void
 439 xmesa_free_buffer(XMesaBuffer buffer)
 440 {
 441    XMesaBuffer prev = NULL, b;
 442
 443    for (b = XMesaBufferList; b; b = b->Next) {
 444       if (b == buffer) {
 445          struct gl_framebuffer *fb = &buffer->stfb->Base;
 446
 447          /* unlink buffer from list */
 448          if (prev)
 449             prev->Next = buffer->Next;
 450          else
 451             XMesaBufferList = buffer->Next;
 452
 453          /* mark as delete pending */
 454          fb->DeletePending = GL_TRUE;
 455
 456          /* Since the X window for the XMesaBuffer is going away, we don't
 457           * want to dereference this pointer in the future.
 458           */
 459          b->drawable = 0;
 460
 461          buffer->tempImage->data = NULL;
 462          XDestroyImage(buffer->tempImage);
 463
 464          /* Unreference.  If count = zero we'll really delete the buffer */
 465          _mesa_unreference_framebuffer(&fb);
 466
 467          XFreeGC(b->xm_visual->display, b->gc);
 468
 469          free(buffer);
 470
 471          return;
 472       }
 473       /* continue search */
 474       prev = b;
 475    }
 476    /* buffer not found in XMesaBufferList */
 477    _mesa_problem(NULL,"xmesa_free_buffer() - buffer not found\n");
 478 }
 479
 480
 481
 482 /**********************************************************************/
 483 /*****                   Misc Private Functions                   *****/
 484 /**********************************************************************/
 485
 486
 487 /**
 488  * When a context is bound for the first time, we can finally finish
 489  * initializing the context's visual and buffer information.
 490  * \param v  the XMesaVisual to initialize
 491  * \param b  the XMesaBuffer to initialize (may be NULL)
 492  * \param rgb_flag  TRUE = RGBA mode, FALSE = color index mode
 493  * \param window  the window/pixmap we're rendering into
 494  * \param cmap  the colormap associated with the window/pixmap
 495  * \return GL_TRUE=success, GL_FALSE=failure
 496  */
 497 static GLboolean
 498 initialize_visual_and_buffer(XMesaVisual v, XMesaBuffer b,
 499                              GLboolean rgb_flag, XMesaDrawable window,
 500                              XMesaColormap cmap)
 501 {
 502 #ifdef XFree86Server
 503    int client = (window) ? CLIENT_ID(window->id) : 0;
 504 #endif
 505
 506    ASSERT(!b || b->xm_visual == v);
 507
 508    /* Save true bits/pixel */
 509    v->BitsPerPixel = bits_per_pixel(v);
 510    assert(v->BitsPerPixel > 0);
 511
 512    if (rgb_flag == GL_FALSE) {
 513       /* COLOR-INDEXED WINDOW: not supported*/
 514       return GL_FALSE;
 515    }
 516    else {
 517       /* RGB WINDOW:
 518        * We support RGB rendering into almost any kind of visual.
 519        */
 520       const int xclass = v->mesa_visual.visualType;
 521       if (xclass != GLX_TRUE_COLOR && xclass == !GLX_DIRECT_COLOR) {
 522          _mesa_warning(NULL,
 523             "XMesa: RGB mode rendering not supported in given visual.\n");
 524          return GL_FALSE;
 525       }
 526       v->mesa_visual.indexBits = 0;
 527
 528       if (v->BitsPerPixel == 32) {
 529          /* We use XImages for all front/back buffers.  If an X Window or
 530           * X Pixmap is 32bpp, there's no guarantee that the alpha channel
 531           * will be preserved.  For XImages we're in luck.
 532           */
 533          v->mesa_visual.alphaBits = 8;
 534       }
 535    }
 536
 537    /*
 538     * If MESA_INFO env var is set print out some debugging info
 539     * which can help Brian figure out what's going on when a user
 540     * reports bugs.
 541     */
 542    if (_mesa_getenv("MESA_INFO")) {
 543       _mesa_printf("X/Mesa visual = %p\n", (void *) v);
 544       _mesa_printf("X/Mesa level = %d\n", v->mesa_visual.level);
 545       _mesa_printf("X/Mesa depth = %d\n", GET_VISUAL_DEPTH(v));
 546       _mesa_printf("X/Mesa bits per pixel = %d\n", v->BitsPerPixel);
 547    }
 548
 549    if (b && window) {
 550       /* these should have been set in create_xmesa_buffer */
 551       ASSERT(b->drawable == window);
 552
 553       /* Setup for single/double buffering */
 554       if (v->mesa_visual.doubleBufferMode) {
 555          /* Double buffered */
 556          b->shm = xmesa_check_for_xshm( v->display );
 557       }
 558
 559       /* X11 graphics context */
 560 #ifdef XFree86Server
 561       b->gc = CreateScratchGC(v->display, window->depth);
 562 #else
 563       b->gc = XCreateGC( v->display, window, 0, NULL );
 564 #endif
 565       XMesaSetFunction( v->display, b->gc, GXcopy );
 566    }
 567
 568    return GL_TRUE;
 569 }
 570
 571
 572
 573 #define NUM_VISUAL_TYPES   6
 574
 575 /**
 576  * Convert an X visual type to a GLX visual type.
 577  *
 578  * \param visualType X visual type (i.e., \c TrueColor, \c StaticGray, etc.)
 579  *        to be converted.
 580  * \return If \c visualType is a valid X visual type, a GLX visual type will
 581  *         be returned.  Otherwise \c GLX_NONE will be returned.
 582  *
 583  * \note
 584  * This code was lifted directly from lib/GL/glx/glcontextmodes.c in the
 585  * DRI CVS tree.
 586  */
 587 static GLint
 588 xmesa_convert_from_x_visual_type( int visualType )
 589 {
 590     static const int glx_visual_types[ NUM_VISUAL_TYPES ] = {
 591         GLX_STATIC_GRAY,  GLX_GRAY_SCALE,
 592         GLX_STATIC_COLOR, GLX_PSEUDO_COLOR,
 593         GLX_TRUE_COLOR,   GLX_DIRECT_COLOR
 594     };
 595
 596     return ( (unsigned) visualType < NUM_VISUAL_TYPES )
 597         ? glx_visual_types[ visualType ] : GLX_NONE;
 598 }
 599
 600
 601 /**********************************************************************/
 602 /*****                       Public Functions                     *****/
 603 /**********************************************************************/
 604
 605
 606 /*
 607  * Create a new X/Mesa visual.
 608  * Input:  display - X11 display
 609  *         visinfo - an XVisualInfo pointer
 610  *         rgb_flag - GL_TRUE = RGB mode,
 611  *                    GL_FALSE = color index mode
 612  *         alpha_flag - alpha buffer requested?
 613  *         db_flag - GL_TRUE = double-buffered,
 614  *                   GL_FALSE = single buffered
 615  *         stereo_flag - stereo visual?
 616  *         ximage_flag - GL_TRUE = use an XImage for back buffer,
 617  *                       GL_FALSE = use an off-screen pixmap for back buffer
 618  *         depth_size - requested bits/depth values, or zero
 619  *         stencil_size - requested bits/stencil values, or zero
 620  *         accum_red_size - requested bits/red accum values, or zero
 621  *         accum_green_size - requested bits/green accum values, or zero
 622  *         accum_blue_size - requested bits/blue accum values, or zero
 623  *         accum_alpha_size - requested bits/alpha accum values, or zero
 624  *         num_samples - number of samples/pixel if multisampling, or zero
 625  *         level - visual level, usually 0
 626  *         visualCaveat - ala the GLX extension, usually GLX_NONE
 627  * Return;  a new XMesaVisual or 0 if error.
 628  */
 629 PUBLIC
 630 XMesaVisual XMesaCreateVisual( XMesaDisplay *display,
 631                                XMesaVisualInfo visinfo,
 632                                GLboolean rgb_flag,
 633                                GLboolean alpha_flag,
 634                                GLboolean db_flag,
 635                                GLboolean stereo_flag,
 636                                GLboolean ximage_flag,
 637                                GLint depth_size,
 638                                GLint stencil_size,
 639                                GLint accum_red_size,
 640                                GLint accum_green_size,
 641                                GLint accum_blue_size,
 642                                GLint accum_alpha_size,
 643                                GLint num_samples,
 644                                GLint level,
 645                                GLint visualCaveat )
 646 {
 647    XMesaVisual v;
 648    GLint red_bits, green_bits, blue_bits, alpha_bits;
 649
 650 #ifndef XFree86Server
 651    /* For debugging only */
 652    if (_mesa_getenv("MESA_XSYNC")) {
 653       /* This makes debugging X easier.
 654        * In your debugger, set a breakpoint on _XError to stop when an
 655        * X protocol error is generated.
 656        */
 657       XSynchronize( display, 1 );
 658    }
 659 #endif
 660
 661    v = (XMesaVisual) CALLOC_STRUCT(xmesa_visual);
 662    if (!v) {
 663       return NULL;
 664    }
 665
 666    v->display = display;
 667
 668    /* Save a copy of the XVisualInfo struct because the user may X_mesa_free()
 669     * the struct but we may need some of the information contained in it
 670     * at a later time.
 671     */
 672 #ifndef XFree86Server
 673    v->visinfo = (XVisualInfo *) MALLOC(sizeof(*visinfo));
 674    if(!v->visinfo) {
 675       _mesa_free(v);
 676       return NULL;
 677    }
 678    MEMCPY(v->visinfo, visinfo, sizeof(*visinfo));
 679 #endif
 680
 681    v->ximage_flag = ximage_flag;
 682
 683 #ifdef XFree86Server
 684    /* We could calculate these values by ourselves.  nplanes is either the sum
 685     * of the red, green, and blue bits or the number index bits.
 686     * ColormapEntries is either (1U << index_bits) or
 687     * (1U << max(redBits, greenBits, blueBits)).
 688     */
 689    assert(visinfo->nplanes > 0);
 690    v->nplanes = visinfo->nplanes;
 691    v->ColormapEntries = visinfo->ColormapEntries;
 692
 693    v->mesa_visual.redMask = visinfo->redMask;
 694    v->mesa_visual.greenMask = visinfo->greenMask;
 695    v->mesa_visual.blueMask = visinfo->blueMask;
 696    v->mesa_visual.visualID = visinfo->vid;
 697    v->mesa_visual.screen = 0; /* FIXME: What should be done here? */
 698 #else
 699    v->mesa_visual.redMask = visinfo->red_mask;
 700    v->mesa_visual.greenMask = visinfo->green_mask;
 701    v->mesa_visual.blueMask = visinfo->blue_mask;
 702    v->mesa_visual.visualID = visinfo->visualid;
 703    v->mesa_visual.screen = visinfo->screen;
 704 #endif
 705
 706 #if defined(XFree86Server) || !(defined(__cplusplus) || defined(c_plusplus))
 707    v->mesa_visual.visualType = xmesa_convert_from_x_visual_type(visinfo->class);
 708 #else
 709    v->mesa_visual.visualType = xmesa_convert_from_x_visual_type(visinfo->c_class);
 710 #endif
 711
 712    v->mesa_visual.visualRating = visualCaveat;
 713
 714    if (alpha_flag)
 715       v->mesa_visual.alphaBits = 8;
 716
 717    (void) initialize_visual_and_buffer( v, NULL, rgb_flag, 0, 0 );
 718
 719    {
 720       const int xclass = v->mesa_visual.visualType;
 721       if (xclass == GLX_TRUE_COLOR || xclass == GLX_DIRECT_COLOR) {
 722          red_bits   = _mesa_bitcount(GET_REDMASK(v));
 723          green_bits = _mesa_bitcount(GET_GREENMASK(v));
 724          blue_bits  = _mesa_bitcount(GET_BLUEMASK(v));
 725       }
 726       else {
 727          /* this is an approximation */
 728          int depth;
 729          depth = GET_VISUAL_DEPTH(v);
 730          red_bits = depth / 3;
 731          depth -= red_bits;
 732          green_bits = depth / 2;
 733          depth -= green_bits;
 734          blue_bits = depth;
 735          alpha_bits = 0;
 736          assert( red_bits + green_bits + blue_bits == GET_VISUAL_DEPTH(v) );
 737       }
 738       alpha_bits = v->mesa_visual.alphaBits;
 739    }
 740
 741    _mesa_initialize_visual( &v->mesa_visual,
 742                             rgb_flag, db_flag, stereo_flag,
 743                             red_bits, green_bits,
 744                             blue_bits, alpha_bits,
 745                             v->mesa_visual.indexBits,
 746                             depth_size,
 747                             stencil_size,
 748                             accum_red_size, accum_green_size,
 749                             accum_blue_size, accum_alpha_size,
 750                             0 );
 751
 752    /* XXX minor hack */
 753    v->mesa_visual.level = level;
 754    return v;
 755 }
 756
 757
 758 PUBLIC
 759 void XMesaDestroyVisual( XMesaVisual v )
 760 {
 761 #ifndef XFree86Server
 762    _mesa_free(v->visinfo);
 763 #endif
 764    _mesa_free(v);
 765 }
 766
 767
 768
 769 /**
 770  * Create a new XMesaContext.
 771  * \param v  the XMesaVisual
 772  * \param share_list  another XMesaContext with which to share display
 773  *                    lists or NULL if no sharing is wanted.
 774  * \return an XMesaContext or NULL if error.
 775  */
 776 PUBLIC
 777 XMesaContext XMesaCreateContext( XMesaVisual v, XMesaContext share_list )
 778 {
 779    static GLboolean firstTime = GL_TRUE;
 780    struct pipe_context *pipe;
 781    XMesaContext c;
 782    GLcontext *mesaCtx;
 783    uint pf;
 784
 785    if (firstTime) {
 786       pipe_mutex_init(_xmesa_lock);
 787       firstTime = GL_FALSE;
 788    }
 789
 790    /* Note: the XMesaContext contains a Mesa GLcontext struct (inheritance) */
 791    c = (XMesaContext) CALLOC_STRUCT(xmesa_context);
 792    if (!c)
 793       return NULL;
 794
 795    pf = choose_pixel_format(v);
 796    assert(pf);
 797
 798    c->xm_visual = v;
 799    c->xm_buffer = NULL;   /* set later by XMesaMakeCurrent */
 800
 801    if (!getenv("XM_AUB")) {
 802       xmesa_mode = XMESA_SOFTPIPE;
 803       pipe = xmesa_create_pipe_context( c, pf );
 804    }
 805    else {
 806       xmesa_mode = XMESA_AUB;
 807       pipe = xmesa_create_i965simple(xmesa_get_pipe_winsys_aub(v));
 808    }
 809
 810    if (pipe == NULL)
 811       goto fail;
 812
 813    c->st = st_create_context(pipe, &v->mesa_visual,
 814                              share_list ? share_list->st : NULL);
 815    if (c->st == NULL)
 816       goto fail;
 817
 818    mesaCtx = c->st->ctx;
 819    c->st->ctx->DriverCtx = c;
 820
 821 #if 00
 822    _mesa_enable_sw_extensions(mesaCtx);
 823    _mesa_enable_1_3_extensions(mesaCtx);
 824    _mesa_enable_1_4_extensions(mesaCtx);
 825    _mesa_enable_1_5_extensions(mesaCtx);
 826    _mesa_enable_2_0_extensions(mesaCtx);
 827 #endif
 828
 829 #ifdef XFree86Server
 830    /* If we're running in the X server, do bounds checking to prevent
 831     * segfaults and server crashes!
 832     */
 833    mesaCtx->Const.CheckArrayBounds = GL_TRUE;
 834 #endif
 835
 836    return c;
 837
 838  fail:
 839    if (c->st)
 840       st_destroy_context(c->st);
 841    else if (pipe)
 842       pipe->destroy(pipe);
 843    FREE(c);
 844    return NULL;
 845 }
 846
 847
 848
 849 PUBLIC
 850 void XMesaDestroyContext( XMesaContext c )
 851 {
 852    struct pipe_screen *screen = c->st->pipe->screen;
 853    st_destroy_context(c->st);
 854    /* FIXME: We should destroy the screen here, but if we do so, surfaces may
 855     * outlive it, causing segfaults
 856    screen->destroy(screen);
 857    */
 858    _mesa_free(c);
 859 }
 860
 861
 862
 863 /**
 864  * Private function for creating an XMesaBuffer which corresponds to an
 865  * X window or pixmap.
 866  * \param v  the window's XMesaVisual
 867  * \param w  the window we're wrapping
 868  * \return  new XMesaBuffer or NULL if error
 869  */
 870 PUBLIC XMesaBuffer
 871 XMesaCreateWindowBuffer(XMesaVisual v, XMesaWindow w)
 872 {
 873 #ifndef XFree86Server
 874    XWindowAttributes attr;
 875 #endif
 876    XMesaBuffer b;
 877    XMesaColormap cmap;
 878    int depth;
 879
 880    assert(v);
 881    assert(w);
 882
 883    /* Check that window depth matches visual depth */
 884 #ifdef XFree86Server
 885    depth = ((XMesaDrawable)w)->depth;
 886 #else
 887    XGetWindowAttributes( v->display, w, &attr );
 888    depth = attr.depth;
 889 #endif
 890    if (GET_VISUAL_DEPTH(v) != depth) {
 891       _mesa_warning(NULL, "XMesaCreateWindowBuffer: depth mismatch between visual (%d) and window (%d)!\n",
 892                     GET_VISUAL_DEPTH(v), depth);
 893       return NULL;
 894    }
 895
 896    /* Find colormap */
 897 #ifdef XFree86Server
 898    cmap = (ColormapPtr)LookupIDByType(wColormap(w), RT_COLORMAP);
 899 #else
 900    if (attr.colormap) {
 901       cmap = attr.colormap;
 902    }
 903    else {
 904       _mesa_warning(NULL, "Window %u has no colormap!\n", (unsigned int) w);
 905       /* this is weird, a window w/out a colormap!? */
 906       /* OK, let's just allocate a new one and hope for the best */
 907       cmap = XCreateColormap(v->display, w, attr.visual, AllocNone);
 908    }
 909 #endif
 910
 911    b = create_xmesa_buffer((XMesaDrawable) w, WINDOW, v, cmap);
 912    if (!b)
 913       return NULL;
 914
 915    if (!initialize_visual_and_buffer( v, b, v->mesa_visual.rgbMode,
 916                                       (XMesaDrawable) w, cmap )) {
 917       xmesa_free_buffer(b);
 918       return NULL;
 919    }
 920
 921    return b;
 922 }
 923
 924
 925
 926 /**
 927  * Create a new XMesaBuffer from an X pixmap.
 928  *
 929  * \param v    the XMesaVisual
 930  * \param p    the pixmap
 931  * \param cmap the colormap, may be 0 if using a \c GLX_TRUE_COLOR or
 932  *             \c GLX_DIRECT_COLOR visual for the pixmap
 933  * \returns new XMesaBuffer or NULL if error
 934  */
 935 PUBLIC XMesaBuffer
 936 XMesaCreatePixmapBuffer(XMesaVisual v, XMesaPixmap p, XMesaColormap cmap)
 937 {
 938    XMesaBuffer b;
 939
 940    assert(v);
 941
 942    b = create_xmesa_buffer((XMesaDrawable) p, PIXMAP, v, cmap);
 943    if (!b)
 944       return NULL;
 945
 946    if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
 947                                      (XMesaDrawable) p, cmap)) {
 948       xmesa_free_buffer(b);
 949       return NULL;
 950    }
 951
 952    return b;
 953 }
 954
 955
 956 /**
 957  * For GLX_EXT_texture_from_pixmap
 958  */
 959 XMesaBuffer
 960 XMesaCreatePixmapTextureBuffer(XMesaVisual v, XMesaPixmap p,
 961                                XMesaColormap cmap,
 962                                int format, int target, int mipmap)
 963 {
 964    GET_CURRENT_CONTEXT(ctx);
 965    XMesaBuffer b;
 966    GLuint width, height;
 967
 968    assert(v);
 969
 970    b = create_xmesa_buffer((XMesaDrawable) p, PIXMAP, v, cmap);
 971    if (!b)
 972       return NULL;
 973
 974    /* get pixmap size, update framebuffer/renderbuffer dims */
 975    xmesa_get_window_size(v->display, b, &width, &height);
 976    _mesa_resize_framebuffer(NULL, &(b->stfb->Base), width, height);
 977
 978    if (target == 0) {
 979       /* examine dims */
 980       if (ctx->Extensions.ARB_texture_non_power_of_two) {
 981          target = GLX_TEXTURE_2D_EXT;
 982       }
 983       else if (   _mesa_bitcount(width)  == 1
 984                && _mesa_bitcount(height) == 1) {
 985          /* power of two size */
 986          if (height == 1) {
 987             target = GLX_TEXTURE_1D_EXT;
 988          }
 989          else {
 990             target = GLX_TEXTURE_2D_EXT;
 991          }
 992       }
 993       else if (ctx->Extensions.NV_texture_rectangle) {
 994          target = GLX_TEXTURE_RECTANGLE_EXT;
 995       }
 996       else {
 997          /* non power of two textures not supported */
 998          XMesaDestroyBuffer(b);
 999          return 0;
1000       }
1001    }
1002
1003    b->TextureTarget = target;
1004    b->TextureFormat = format;
1005    b->TextureMipmap = mipmap;
1006
1007    if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
1008                                      (XMesaDrawable) p, cmap)) {
1009       xmesa_free_buffer(b);
1010       return NULL;
1011    }
1012
1013    return b;
1014 }
1015
1016
1017
1018 XMesaBuffer
1019 XMesaCreatePBuffer(XMesaVisual v, XMesaColormap cmap,
1020                    unsigned int width, unsigned int height)
1021 {
1022 #ifndef XFree86Server
1023    XMesaWindow root;
1024    XMesaDrawable drawable;  /* X Pixmap Drawable */
1025    XMesaBuffer b;
1026
1027    /* allocate pixmap for front buffer */
1028    root = RootWindow( v->display, v->visinfo->screen );
1029    drawable = XCreatePixmap(v->display, root, width, height,
1030                             v->visinfo->depth);
1031    if (!drawable)
1032       return NULL;
1033
1034    b = create_xmesa_buffer(drawable, PBUFFER, v, cmap);
1035    if (!b)
1036       return NULL;
1037
1038    if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
1039                                      drawable, cmap)) {
1040       xmesa_free_buffer(b);
1041       return NULL;
1042    }
1043
1044    return b;
1045 #else
1046    return 0;
1047 #endif
1048 }
1049
1050
1051
1052 /*
1053  * Deallocate an XMesaBuffer structure and all related info.
1054  */
1055 PUBLIC void
1056 XMesaDestroyBuffer(XMesaBuffer b)
1057 {
1058    xmesa_free_buffer(b);
1059 }
1060
1061
1062 /**
1063  * Query the current window size and update the corresponding GLframebuffer
1064  * and all attached renderbuffers.
1065  * Called when:
1066  *  1. the first time a buffer is bound to a context.
1067  *  2. from the XMesaResizeBuffers() API function.
1068  *  3. SwapBuffers.  XXX probabaly from xm_flush_frontbuffer() too...
1069  * Note: it's possible (and legal) for xmctx to be NULL.  That can happen
1070  * when resizing a buffer when no rendering context is bound.
1071  */
1072 void
1073 xmesa_check_and_update_buffer_size(XMesaContext xmctx, XMesaBuffer drawBuffer)
1074 {
1075    GLuint width, height;
1076    xmesa_get_window_size(drawBuffer->xm_visual->display, drawBuffer, &width, &height);
1077    st_resize_framebuffer(drawBuffer->stfb, width, height);
1078 }
1079
1080
1081 /*
1082  * Bind buffer b to context c and make c the current rendering context.
1083  */
1084 GLboolean XMesaMakeCurrent( XMesaContext c, XMesaBuffer b )
1085 {
1086    return XMesaMakeCurrent2( c, b, b );
1087 }
1088
1089
1090 /*
1091  * Bind buffer b to context c and make c the current rendering context.
1092  */
1093 PUBLIC
1094 GLboolean XMesaMakeCurrent2( XMesaContext c, XMesaBuffer drawBuffer,
1095                              XMesaBuffer readBuffer )
1096 {
1097    if (c) {
1098       if (!drawBuffer || !readBuffer)
1099          return GL_FALSE;  /* must specify buffers! */
1100
1101 #if 0
1102       /* XXX restore this optimization */
1103       if (&(c->mesa) == _mesa_get_current_context()
1104           && c->mesa.DrawBuffer == &drawBuffer->mesa_buffer
1105           && c->mesa.ReadBuffer == &readBuffer->mesa_buffer
1106           && xmesa_buffer(c->mesa.DrawBuffer)->wasCurrent) {
1107          /* same context and buffer, do nothing */
1108          return GL_TRUE;
1109       }
1110 #endif
1111
1112       c->xm_buffer = drawBuffer;
1113
1114       /* Call this periodically to detect when the user has begun using
1115        * GL rendering from multiple threads.
1116        */
1117       _glapi_check_multithread();
1118
1119       st_make_current(c->st, drawBuffer->stfb, readBuffer->stfb);
1120
1121       xmesa_check_and_update_buffer_size(c, drawBuffer);
1122       if (readBuffer != drawBuffer)
1123          xmesa_check_and_update_buffer_size(c, readBuffer);
1124
1125       /* Solution to Stephane Rehel's problem with glXReleaseBuffersMESA(): */
1126       drawBuffer->wasCurrent = GL_TRUE;
1127    }
1128    else {
1129       /* Detach */
1130       st_make_current( NULL, NULL, NULL );
1131    }
1132    return GL_TRUE;
1133 }
1134
1135
1136 /*
1137  * Unbind the context c from its buffer.
1138  */
1139 GLboolean XMesaUnbindContext( XMesaContext c )
1140 {
1141    /* A no-op for XFree86 integration purposes */
1142    return GL_TRUE;
1143 }
1144
1145
1146 XMesaContext XMesaGetCurrentContext( void )
1147 {
1148    GET_CURRENT_CONTEXT(ctx);
1149    if (ctx) {
1150       XMesaContext xmesa = xmesa_context(ctx);
1151       return xmesa;
1152    }
1153    else {
1154       return 0;
1155    }
1156 }
1157
1158
1159 XMesaBuffer XMesaGetCurrentBuffer( void )
1160 {
1161    GET_CURRENT_CONTEXT(ctx);
1162    if (ctx) {
1163       XMesaBuffer xmbuf = xmesa_buffer(ctx->DrawBuffer);
1164       return xmbuf;
1165    }
1166    else {
1167       return 0;
1168    }
1169 }
1170
1171
1172 /* New in Mesa 3.1 */
1173 XMesaBuffer XMesaGetCurrentReadBuffer( void )
1174 {
1175    GET_CURRENT_CONTEXT(ctx);
1176    if (ctx) {
1177       return xmesa_buffer(ctx->ReadBuffer);
1178    }
1179    else {
1180       return 0;
1181    }
1182 }
1183
1184
1185 #ifdef XFree86Server
1186 PUBLIC
1187 GLboolean XMesaForceCurrent(XMesaContext c)
1188 {
1189    if (c) {
1190       _glapi_set_dispatch(c->mesa.CurrentDispatch);
1191
1192       if (&(c->mesa) != _mesa_get_current_context()) {
1193          _mesa_make_current(&c->mesa, c->mesa.DrawBuffer, c->mesa.ReadBuffer);
1194       }
1195    }
1196    else {
1197       _mesa_make_current(NULL, NULL, NULL);
1198    }
1199    return GL_TRUE;
1200 }
1201
1202
1203 PUBLIC
1204 GLboolean XMesaLoseCurrent(XMesaContext c)
1205 {
1206    (void) c;
1207    _mesa_make_current(NULL, NULL, NULL);
1208    return GL_TRUE;
1209 }
1210
1211
1212 PUBLIC
1213 GLboolean XMesaCopyContext( XMesaContext xm_src, XMesaContext xm_dst, GLuint mask )
1214 {
1215    _mesa_copy_context(&xm_src->mesa, &xm_dst->mesa, mask);
1216    return GL_TRUE;
1217 }
1218 #endif /* XFree86Server */
1219
1220
1221 #ifndef FX
1222 GLboolean XMesaSetFXmode( GLint mode )
1223 {
1224    (void) mode;
1225    return GL_FALSE;
1226 }
1227 #endif
1228
1229
1230
1231 /*
1232  * Copy the back buffer to the front buffer.  If there's no back buffer
1233  * this is a no-op.
1234  */
1235 PUBLIC
1236 void XMesaSwapBuffers( XMesaBuffer b )
1237 {
1238    struct pipe_surface *surf;
1239
1240    /* If we're swapping the buffer associated with the current context
1241     * we have to flush any pending rendering commands first.
1242     */
1243    st_notify_swapbuffers(b->stfb);
1244
1245    surf = st_get_framebuffer_surface(b->stfb, ST_SURFACE_BACK_LEFT);
1246    if (surf) {
1247       if (xmesa_mode == XMESA_AUB)
1248          xmesa_display_aub( surf );
1249       else
1250          xmesa_display_surface(b, surf);
1251    }
1252
1253    xmesa_check_and_update_buffer_size(NULL, b);
1254 }
1255
1256
1257
1258 /*
1259  * Copy sub-region of back buffer to front buffer
1260  */
1261 void XMesaCopySubBuffer( XMesaBuffer b, int x, int y, int width, int height )
1262 {
1263    struct pipe_surface *surf_front
1264       = st_get_framebuffer_surface(b->stfb, ST_SURFACE_FRONT_LEFT);
1265    struct pipe_surface *surf_back
1266       = st_get_framebuffer_surface(b->stfb, ST_SURFACE_BACK_LEFT);
1267    struct pipe_context *pipe = NULL; /* XXX fix */
1268
1269    if (!surf_front || !surf_back)
1270       return;
1271
1272    pipe->surface_copy(pipe,
1273                       FALSE,
1274                       surf_front, x, y,  /* dest */
1275                       surf_back, x, y,   /* src */
1276                       width, height);
1277 }
1278
1279
1280
1281 /*
1282  * Return the depth buffer associated with an XMesaBuffer.
1283  * Input:  b - the XMesa buffer handle
1284  * Output:  width, height - size of buffer in pixels
1285  *          bytesPerValue - bytes per depth value (2 or 4)
1286  *          buffer - pointer to depth buffer values
1287  * Return:  GL_TRUE or GL_FALSE to indicate success or failure.
1288  */
1289 GLboolean XMesaGetDepthBuffer( XMesaBuffer b, GLint *width, GLint *height,
1290                                GLint *bytesPerValue, void **buffer )
1291 {
1292    *width = 0;
1293    *height = 0;
1294    *bytesPerValue = 0;
1295    *buffer = 0;
1296    return GL_FALSE;
1297 }
1298
1299
1300 void XMesaFlush( XMesaContext c )
1301 {
1302    if (c && c->xm_visual->display) {
1303 #ifdef XFree86Server
1304       /* NOT_NEEDED */
1305 #else
1306       st_finish(c->st);
1307       XSync( c->xm_visual->display, False );
1308 #endif
1309    }
1310 }
1311
1312
1313
1314 const char *XMesaGetString( XMesaContext c, int name )
1315 {
1316    (void) c;
1317    if (name==XMESA_VERSION) {
1318       return "5.0";
1319    }
1320    else if (name==XMESA_EXTENSIONS) {
1321       return "";
1322    }
1323    else {
1324       return NULL;
1325    }
1326 }
1327
1328
1329
1330 XMesaBuffer XMesaFindBuffer( XMesaDisplay *dpy, XMesaDrawable d )
1331 {
1332    XMesaBuffer b;
1333    for (b=XMesaBufferList; b; b=b->Next) {
1334       if (b->drawable == d && b->xm_visual->display == dpy) {
1335          return b;
1336       }
1337    }
1338    return NULL;
1339 }
1340
1341
1342 /**
1343  * Free/destroy all XMesaBuffers associated with given display.
1344  */
1345 void xmesa_destroy_buffers_on_display(XMesaDisplay *dpy)
1346 {
1347    XMesaBuffer b, next;
1348    for (b = XMesaBufferList; b; b = next) {
1349       next = b->Next;
1350       if (b->xm_visual->display == dpy) {
1351          xmesa_free_buffer(b);
1352       }
1353    }
1354 }
1355
1356
1357 /*
1358  * Look for XMesaBuffers whose X window has been destroyed.
1359  * Deallocate any such XMesaBuffers.
1360  */
1361 void XMesaGarbageCollect( void )
1362 {
1363    XMesaBuffer b, next;
1364    for (b=XMesaBufferList; b; b=next) {
1365       next = b->Next;
1366       if (b->xm_visual &&
1367           b->xm_visual->display &&
1368           b->drawable &&
1369           b->type == WINDOW) {
1370 #ifdef XFree86Server
1371          /* NOT_NEEDED */
1372 #else
1373          XSync(b->xm_visual->display, False);
1374          if (!window_exists( b->xm_visual->display, b->drawable )) {
1375             /* found a dead window, free the ancillary info */
1376             XMesaDestroyBuffer( b );
1377          }
1378 #endif
1379       }
1380    }
1381 }
1382
1383
1384 unsigned long XMesaDitherColor( XMesaContext xmesa, GLint x, GLint y,
1385                                 GLfloat red, GLfloat green,
1386                                 GLfloat blue, GLfloat alpha )
1387 {
1388    /* no longer supported */
1389    return 0;
1390 }
1391
1392
1393 /*
1394  * This is typically called when the window size changes and we need
1395  * to reallocate the buffer's back/depth/stencil/accum buffers.
1396  */
1397 PUBLIC void
1398 XMesaResizeBuffers( XMesaBuffer b )
1399 {
1400    GET_CURRENT_CONTEXT(ctx);
1401    XMesaContext xmctx = xmesa_context(ctx);
1402    if (!xmctx)
1403       return;
1404    xmesa_check_and_update_buffer_size(xmctx, b);
1405 }
1406
1407
1408
1409
1410 PUBLIC void
1411 XMesaBindTexImage(XMesaDisplay *dpy, XMesaBuffer drawable, int buffer,
1412                   const int *attrib_list)
1413 {
1414 }
1415
1416
1417
1418 PUBLIC void
1419 XMesaReleaseTexImage(XMesaDisplay *dpy, XMesaBuffer drawable, int buffer)
1420 {
1421 }
1422