src/mesa/drivers/x11/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.  In
  52  * Mesa, when byte swapping is needed we use the PF_TRUECOLOR pixel format
  53  * and use XPutPixel everywhere except in the implementation of
  54  * glClear(GL_COLOR_BUFFER_BIT).  We want this function to be fast so
  55  * instead of using XPutPixel we "poke" our values after byte-swapping
  56  * the clear pixel value if needed.
  57  *
  58  */
  59
  60 #ifdef __CYGWIN__
  61 #undef WIN32
  62 #undef __WIN32__
  63 #endif
  64
  65 #include "glxheader.h"
  66 #include "xmesaP.h"
  67 #include "main/context.h"
  68 #include "main/extensions.h"
  69 #include "main/framebuffer.h"
  70 #include "main/imports.h"
  71 #include "main/macros.h"
  72 #include "main/renderbuffer.h"
  73 #include "main/teximage.h"
  74 #include "glapi/glthread.h"
  75 #include "swrast/swrast.h"
  76 #include "swrast/s_renderbuffer.h"
  77 #include "swrast_setup/swrast_setup.h"
  78 #include "vbo/vbo.h"
  79 #include "tnl/tnl.h"
  80 #include "tnl/t_context.h"
  81 #include "tnl/t_pipeline.h"
  82 #include "drivers/common/driverfuncs.h"
  83 #include "drivers/common/meta.h"
  84
  85 /**
  86  * Global X driver lock
  87  */
  88 _glthread_Mutex _xmesa_lock;
  89
  90
  91
  92 /**********************************************************************/
  93 /*****                     X Utility Functions                    *****/
  94 /**********************************************************************/
  95
  96
  97 /**
  98  * Return the host's byte order as LSBFirst or MSBFirst ala X.
  99  */
 100 static int host_byte_order( void )
 101 {
 102    int i = 1;
 103    char *cptr = (char *) &i;
 104    return (*cptr==1) ? LSBFirst : MSBFirst;
 105 }
 106
 107
 108 /**
 109  * Check if the X Shared Memory extension is available.
 110  * Return:  0 = not available
 111  *          1 = shared XImage support available
 112  *          2 = shared Pixmap support available also
 113  */
 114 static int check_for_xshm( XMesaDisplay *display )
 115 {
 116 #if defined(USE_XSHM)
 117    int ignore;
 118
 119    if (XQueryExtension( display, "MIT-SHM", &ignore, &ignore, &ignore )) {
 120       /* Note: we're no longer calling XShmQueryVersion() here.  It seems
 121        * to be flakey (triggers a spurious X protocol error when we close
 122        * one display connection and start using a new one.  XShm has been
 123        * around a long time and hasn't changed so if MIT_SHM is supported
 124        * we assume we're good to go.
 125        */
 126       return 2;
 127    }
 128    else {
 129       return 0;
 130    }
 131 #else
 132    /* No  XSHM support */
 133    return 0;
 134 #endif
 135 }
 136
 137
 138 /**
 139  * Apply gamma correction to an intensity value in [0..max].  Return the
 140  * new intensity value.
 141  */
 142 static GLint
 143 gamma_adjust( GLfloat gamma, GLint value, GLint max )
 144 {
 145    if (gamma == 1.0) {
 146       return value;
 147    }
 148    else {
 149       double x = (double) value / (double) max;
 150       return IROUND_POS((GLfloat) max * pow(x, 1.0F/gamma));
 151    }
 152 }
 153
 154
 155
 156 /**
 157  * Return the true number of bits per pixel for XImages.
 158  * For example, if we request a 24-bit deep visual we may actually need/get
 159  * 32bpp XImages.  This function returns the appropriate bpp.
 160  * Input:  dpy - the X display
 161  *         visinfo - desribes the visual to be used for XImages
 162  * Return:  true number of bits per pixel for XImages
 163  */
 164 static int
 165 bits_per_pixel( XMesaVisual xmv )
 166 {
 167    XMesaDisplay *dpy = xmv->display;
 168    XMesaVisualInfo visinfo = xmv->visinfo;
 169    XMesaImage *img;
 170    int bitsPerPixel;
 171    /* Create a temporary XImage */
 172    img = XCreateImage( dpy, visinfo->visual, visinfo->depth,
 173                        ZPixmap, 0,           /*format, offset*/
 174                        (char*) MALLOC(8),    /*data*/
 175                        1, 1,                 /*width, height*/
 176                        32,                   /*bitmap_pad*/
 177                        0                     /*bytes_per_line*/
 178                      );
 179    assert(img);
 180    /* grab the bits/pixel value */
 181    bitsPerPixel = img->bits_per_pixel;
 182    /* free the XImage */
 183    free( img->data );
 184    img->data = NULL;
 185    XMesaDestroyImage( img );
 186    return bitsPerPixel;
 187 }
 188
 189
 190
 191 /*
 192  * Determine if a given X window ID is valid (window exists).
 193  * Do this by calling XGetWindowAttributes() for the window and
 194  * checking if we catch an X error.
 195  * Input:  dpy - the display
 196  *         win - the window to check for existance
 197  * Return:  GL_TRUE - window exists
 198  *          GL_FALSE - window doesn't exist
 199  */
 200 static GLboolean WindowExistsFlag;
 201
 202 static int window_exists_err_handler( XMesaDisplay* dpy, XErrorEvent* xerr )
 203 {
 204    (void) dpy;
 205    if (xerr->error_code == BadWindow) {
 206       WindowExistsFlag = GL_FALSE;
 207    }
 208    return 0;
 209 }
 210
 211 static GLboolean window_exists( XMesaDisplay *dpy, Window win )
 212 {
 213    XWindowAttributes wa;
 214    int (*old_handler)( XMesaDisplay*, XErrorEvent* );
 215    WindowExistsFlag = GL_TRUE;
 216    old_handler = XSetErrorHandler(window_exists_err_handler);
 217    XGetWindowAttributes( dpy, win, &wa ); /* dummy request */
 218    XSetErrorHandler(old_handler);
 219    return WindowExistsFlag;
 220 }
 221
 222 static Status
 223 get_drawable_size( XMesaDisplay *dpy, Drawable d, GLuint *width, GLuint *height )
 224 {
 225    Window root;
 226    Status stat;
 227    int xpos, ypos;
 228    unsigned int w, h, bw, depth;
 229    stat = XGetGeometry(dpy, d, &root, &xpos, &ypos, &w, &h, &bw, &depth);
 230    *width = w;
 231    *height = h;
 232    return stat;
 233 }
 234
 235
 236 /**
 237  * Return the size of the window (or pixmap) that corresponds to the
 238  * given XMesaBuffer.
 239  * \param width  returns width in pixels
 240  * \param height  returns height in pixels
 241  */
 242 void
 243 xmesa_get_window_size(XMesaDisplay *dpy, XMesaBuffer b,
 244                       GLuint *width, GLuint *height)
 245 {
 246    Status stat;
 247
 248    _glthread_LOCK_MUTEX(_xmesa_lock);
 249    XSync(b->xm_visual->display, 0); /* added for Chromium */
 250    stat = get_drawable_size(dpy, b->frontxrb->pixmap, width, height);
 251    _glthread_UNLOCK_MUTEX(_xmesa_lock);
 252
 253    if (!stat) {
 254       /* probably querying a window that's recently been destroyed */
 255       _mesa_warning(NULL, "XGetGeometry failed!\n");
 256       *width = *height = 1;
 257    }
 258 }
 259
 260
 261
 262 /**********************************************************************/
 263 /*****                Linked list of XMesaBuffers                 *****/
 264 /**********************************************************************/
 265
 266 XMesaBuffer XMesaBufferList = NULL;
 267
 268
 269 /**
 270  * Allocate a new XMesaBuffer object which corresponds to the given drawable.
 271  * Note that XMesaBuffer is derived from struct gl_framebuffer.
 272  * The new XMesaBuffer will not have any size (Width=Height=0).
 273  *
 274  * \param d  the corresponding X drawable (window or pixmap)
 275  * \param type  either WINDOW, PIXMAP or PBUFFER, describing d
 276  * \param vis  the buffer's visual
 277  * \param cmap  the window's colormap, if known.
 278  * \return new XMesaBuffer or NULL if any problem
 279  */
 280 static XMesaBuffer
 281 create_xmesa_buffer(XMesaDrawable d, BufferType type,
 282                     XMesaVisual vis, XMesaColormap cmap)
 283 {
 284    XMesaBuffer b;
 285
 286    ASSERT(type == WINDOW || type == PIXMAP || type == PBUFFER);
 287
 288    b = (XMesaBuffer) CALLOC_STRUCT(xmesa_buffer);
 289    if (!b)
 290       return NULL;
 291
 292    b->display = vis->display;
 293    b->xm_visual = vis;
 294    b->type = type;
 295    b->cmap = cmap;
 296
 297    _mesa_initialize_window_framebuffer(&b->mesa_buffer, &vis->mesa_visual);
 298    b->mesa_buffer.Delete = xmesa_delete_framebuffer;
 299
 300    /*
 301     * Front renderbuffer
 302     */
 303    b->frontxrb = xmesa_new_renderbuffer(NULL, 0, vis, GL_FALSE);
 304    if (!b->frontxrb) {
 305       free(b);
 306       return NULL;
 307    }
 308    b->frontxrb->Parent = b;
 309    b->frontxrb->drawable = d;
 310    b->frontxrb->pixmap = (XMesaPixmap) d;
 311    _mesa_add_renderbuffer(&b->mesa_buffer, BUFFER_FRONT_LEFT,
 312                           &b->frontxrb->Base.Base);
 313
 314    /*
 315     * Back renderbuffer
 316     */
 317    if (vis->mesa_visual.doubleBufferMode) {
 318       b->backxrb = xmesa_new_renderbuffer(NULL, 0, vis, GL_TRUE);
 319       if (!b->backxrb) {
 320          /* XXX free front xrb too */
 321          free(b);
 322          return NULL;
 323       }
 324       b->backxrb->Parent = b;
 325       /* determine back buffer implementation */
 326       b->db_mode = vis->ximage_flag ? BACK_XIMAGE : BACK_PIXMAP;
 327
 328       _mesa_add_renderbuffer(&b->mesa_buffer, BUFFER_BACK_LEFT,
 329                              &b->backxrb->Base.Base);
 330    }
 331
 332    /*
 333     * Other renderbuffer (depth, stencil, etc)
 334     */
 335    _swrast_add_soft_renderbuffers(&b->mesa_buffer,
 336                                   GL_FALSE,  /* color */
 337                                   vis->mesa_visual.haveDepthBuffer,
 338                                   vis->mesa_visual.haveStencilBuffer,
 339                                   vis->mesa_visual.haveAccumBuffer,
 340                                   GL_FALSE,  /* software alpha buffer */
 341                                   vis->mesa_visual.numAuxBuffers > 0 );
 342
 343    /* GLX_EXT_texture_from_pixmap */
 344    b->TextureTarget = 0;
 345    b->TextureFormat = GLX_TEXTURE_FORMAT_NONE_EXT;
 346    b->TextureMipmap = 0;
 347
 348    /* insert buffer into linked list */
 349    b->Next = XMesaBufferList;
 350    XMesaBufferList = b;
 351
 352    return b;
 353 }
 354
 355
 356 /**
 357  * Find an XMesaBuffer by matching X display and colormap but NOT matching
 358  * the notThis buffer.
 359  */
 360 XMesaBuffer
 361 xmesa_find_buffer(XMesaDisplay *dpy, XMesaColormap cmap, XMesaBuffer notThis)
 362 {
 363    XMesaBuffer b;
 364    for (b=XMesaBufferList; b; b=b->Next) {
 365       if (b->display==dpy && b->cmap==cmap && b!=notThis) {
 366          return b;
 367       }
 368    }
 369    return NULL;
 370 }
 371
 372
 373 /**
 374  * Remove buffer from linked list, delete if no longer referenced.
 375  */
 376 static void
 377 xmesa_free_buffer(XMesaBuffer buffer)
 378 {
 379    XMesaBuffer prev = NULL, b;
 380
 381    for (b = XMesaBufferList; b; b = b->Next) {
 382       if (b == buffer) {
 383          struct gl_framebuffer *fb = &buffer->mesa_buffer;
 384
 385          /* unlink buffer from list */
 386          if (prev)
 387             prev->Next = buffer->Next;
 388          else
 389             XMesaBufferList = buffer->Next;
 390
 391          /* mark as delete pending */
 392          fb->DeletePending = GL_TRUE;
 393
 394          /* Since the X window for the XMesaBuffer is going away, we don't
 395           * want to dereference this pointer in the future.
 396           */
 397          b->frontxrb->drawable = 0;
 398
 399          /* Unreference.  If count = zero we'll really delete the buffer */
 400          _mesa_reference_framebuffer(&fb, NULL);
 401
 402          return;
 403       }
 404       /* continue search */
 405       prev = b;
 406    }
 407    /* buffer not found in XMesaBufferList */
 408    _mesa_problem(NULL,"xmesa_free_buffer() - buffer not found\n");
 409 }
 410
 411
 412
 413
 414 /**********************************************************************/
 415 /*****                   Misc Private Functions                   *****/
 416 /**********************************************************************/
 417
 418
 419 /**
 420  * Setup RGB rendering for a window with a True/DirectColor visual.
 421  */
 422 static void
 423 setup_truecolor(XMesaVisual v, XMesaBuffer buffer, XMesaColormap cmap)
 424 {
 425    unsigned long rmask, gmask, bmask;
 426    (void) buffer;
 427    (void) cmap;
 428
 429    /* Compute red multiplier (mask) and bit shift */
 430    v->rshift = 0;
 431    rmask = GET_REDMASK(v);
 432    while ((rmask & 1)==0) {
 433       v->rshift++;
 434       rmask = rmask >> 1;
 435    }
 436
 437    /* Compute green multiplier (mask) and bit shift */
 438    v->gshift = 0;
 439    gmask = GET_GREENMASK(v);
 440    while ((gmask & 1)==0) {
 441       v->gshift++;
 442       gmask = gmask >> 1;
 443    }
 444
 445    /* Compute blue multiplier (mask) and bit shift */
 446    v->bshift = 0;
 447    bmask = GET_BLUEMASK(v);
 448    while ((bmask & 1)==0) {
 449       v->bshift++;
 450       bmask = bmask >> 1;
 451    }
 452
 453    /*
 454     * Compute component-to-pixel lookup tables and dithering kernel
 455     */
 456    {
 457       static GLubyte kernel[16] = {
 458           0*16,  8*16,  2*16, 10*16,
 459          12*16,  4*16, 14*16,  6*16,
 460           3*16, 11*16,  1*16,  9*16,
 461          15*16,  7*16, 13*16,  5*16,
 462       };
 463       GLint rBits = _mesa_bitcount(rmask);
 464       GLint gBits = _mesa_bitcount(gmask);
 465       GLint bBits = _mesa_bitcount(bmask);
 466       GLint maxBits;
 467       GLuint i;
 468
 469       /* convert pixel components in [0,_mask] to RGB values in [0,255] */
 470       for (i=0; i<=rmask; i++)
 471          v->PixelToR[i] = (unsigned char) ((i * 255) / rmask);
 472       for (i=0; i<=gmask; i++)
 473          v->PixelToG[i] = (unsigned char) ((i * 255) / gmask);
 474       for (i=0; i<=bmask; i++)
 475          v->PixelToB[i] = (unsigned char) ((i * 255) / bmask);
 476
 477       /* convert RGB values from [0,255] to pixel components */
 478
 479       for (i=0;i<256;i++) {
 480          GLint r = gamma_adjust(v->RedGamma,   i, 255);
 481          GLint g = gamma_adjust(v->GreenGamma, i, 255);
 482          GLint b = gamma_adjust(v->BlueGamma,  i, 255);
 483          v->RtoPixel[i] = (r >> (8-rBits)) << v->rshift;
 484          v->GtoPixel[i] = (g >> (8-gBits)) << v->gshift;
 485          v->BtoPixel[i] = (b >> (8-bBits)) << v->bshift;
 486       }
 487       /* overflow protection */
 488       for (i=256;i<512;i++) {
 489          v->RtoPixel[i] = v->RtoPixel[255];
 490          v->GtoPixel[i] = v->GtoPixel[255];
 491          v->BtoPixel[i] = v->BtoPixel[255];
 492       }
 493
 494       /* setup dithering kernel */
 495       maxBits = rBits;
 496       if (gBits > maxBits)  maxBits = gBits;
 497       if (bBits > maxBits)  maxBits = bBits;
 498       for (i=0;i<16;i++) {
 499          v->Kernel[i] = kernel[i] >> maxBits;
 500       }
 501
 502       v->undithered_pf = PF_Truecolor;
 503       v->dithered_pf = (GET_VISUAL_DEPTH(v)<24) ? PF_Dither_True : PF_Truecolor;
 504    }
 505
 506    /*
 507     * Now check for TrueColor visuals which we can optimize.
 508     */
 509    if (   GET_REDMASK(v)  ==0x0000ff
 510        && GET_GREENMASK(v)==0x00ff00
 511        && GET_BLUEMASK(v) ==0xff0000
 512        && CHECK_BYTE_ORDER(v)
 513        && v->BitsPerPixel==32
 514        && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
 515       /* common 32 bpp config used on SGI, Sun */
 516       v->undithered_pf = v->dithered_pf = PF_8A8B8G8R; /* ABGR */
 517    }
 518    else if (GET_REDMASK(v)  == 0xff0000
 519          && GET_GREENMASK(v)== 0x00ff00
 520          && GET_BLUEMASK(v) == 0x0000ff
 521          && CHECK_BYTE_ORDER(v)
 522          && v->RedGamma == 1.0 && v->GreenGamma == 1.0 && v->BlueGamma == 1.0){
 523       if (v->BitsPerPixel==32) {
 524          /* if 32 bpp, and visual indicates 8 bpp alpha channel */
 525          if (GET_VISUAL_DEPTH(v) == 32 && v->mesa_visual.alphaBits == 8)
 526             v->undithered_pf = v->dithered_pf = PF_8A8R8G8B; /* ARGB */
 527          else
 528             v->undithered_pf = v->dithered_pf = PF_8R8G8B; /* xRGB */
 529       }
 530       else if (v->BitsPerPixel == 24) {
 531          v->undithered_pf = v->dithered_pf = PF_8R8G8B24; /* RGB */
 532       }
 533    }
 534    else if (GET_REDMASK(v)  ==0xf800
 535        &&   GET_GREENMASK(v)==0x07e0
 536        &&   GET_BLUEMASK(v) ==0x001f
 537        && CHECK_BYTE_ORDER(v)
 538        && v->BitsPerPixel==16
 539        && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
 540       /* 5-6-5 RGB */
 541       v->undithered_pf = PF_5R6G5B;
 542       v->dithered_pf = PF_Dither_5R6G5B;
 543    }
 544 }
 545
 546
 547 /**
 548  * When a context is bound for the first time, we can finally finish
 549  * initializing the context's visual and buffer information.
 550  * \param v  the XMesaVisual to initialize
 551  * \param b  the XMesaBuffer to initialize (may be NULL)
 552  * \param rgb_flag  TRUE = RGBA mode, FALSE = color index mode
 553  * \param window  the window/pixmap we're rendering into
 554  * \param cmap  the colormap associated with the window/pixmap
 555  * \return GL_TRUE=success, GL_FALSE=failure
 556  */
 557 static GLboolean
 558 initialize_visual_and_buffer(XMesaVisual v, XMesaBuffer b,
 559                              XMesaDrawable window,
 560                              XMesaColormap cmap)
 561 {
 562    const int xclass = v->visualType;
 563
 564
 565    ASSERT(!b || b->xm_visual == v);
 566
 567    /* Save true bits/pixel */
 568    v->BitsPerPixel = bits_per_pixel(v);
 569    assert(v->BitsPerPixel > 0);
 570
 571    /* RGB WINDOW:
 572     * We support RGB rendering into almost any kind of visual.
 573     */
 574    if (xclass == GLX_TRUE_COLOR || xclass == GLX_DIRECT_COLOR) {
 575       setup_truecolor( v, b, cmap );
 576    }
 577    else {
 578       _mesa_warning(NULL, "XMesa: RGB mode rendering not supported in given visual.\n");
 579       return GL_FALSE;
 580    }
 581    v->mesa_visual.indexBits = 0;
 582
 583    if (_mesa_getenv("MESA_NO_DITHER")) {
 584       v->dithered_pf = v->undithered_pf;
 585    }
 586
 587
 588    /*
 589     * If MESA_INFO env var is set print out some debugging info
 590     * which can help Brian figure out what's going on when a user
 591     * reports bugs.
 592     */
 593    if (_mesa_getenv("MESA_INFO")) {
 594       printf("X/Mesa visual = %p\n", (void *) v);
 595       printf("X/Mesa dithered pf = %u\n", v->dithered_pf);
 596       printf("X/Mesa undithered pf = %u\n", v->undithered_pf);
 597       printf("X/Mesa level = %d\n", v->mesa_visual.level);
 598       printf("X/Mesa depth = %d\n", GET_VISUAL_DEPTH(v));
 599       printf("X/Mesa bits per pixel = %d\n", v->BitsPerPixel);
 600    }
 601
 602    if (b && window) {
 603       /* Do window-specific initializations */
 604
 605       /* these should have been set in create_xmesa_buffer */
 606       ASSERT(b->frontxrb->drawable == window);
 607       ASSERT(b->frontxrb->pixmap == (XMesaPixmap) window);
 608
 609       /* Setup for single/double buffering */
 610       if (v->mesa_visual.doubleBufferMode) {
 611          /* Double buffered */
 612          b->shm = check_for_xshm( v->display );
 613       }
 614
 615       /* X11 graphics contexts */
 616       b->gc = XCreateGC( v->display, window, 0, NULL );
 617       XMesaSetFunction( v->display, b->gc, GXcopy );
 618
 619       /* cleargc - for glClear() */
 620       b->cleargc = XCreateGC( v->display, window, 0, NULL );
 621       XMesaSetFunction( v->display, b->cleargc, GXcopy );
 622
 623       /*
 624        * Don't generate Graphics Expose/NoExpose events in swapbuffers().
 625        * Patch contributed by Michael Pichler May 15, 1995.
 626        */
 627       {
 628          XGCValues gcvalues;
 629          gcvalues.graphics_exposures = False;
 630          b->swapgc = XCreateGC(v->display, window,
 631                                GCGraphicsExposures, &gcvalues);
 632       }
 633       XMesaSetFunction( v->display, b->swapgc, GXcopy );
 634    }
 635
 636    return GL_TRUE;
 637 }
 638
 639
 640
 641 /*
 642  * Convert an RGBA color to a pixel value.
 643  */
 644 unsigned long
 645 xmesa_color_to_pixel(struct gl_context *ctx,
 646                      GLubyte r, GLubyte g, GLubyte b, GLubyte a,
 647                      GLuint pixelFormat)
 648 {
 649    XMesaContext xmesa = XMESA_CONTEXT(ctx);
 650    switch (pixelFormat) {
 651       case PF_Truecolor:
 652          {
 653             unsigned long p;
 654             PACK_TRUECOLOR( p, r, g, b );
 655             return p;
 656          }
 657       case PF_8A8B8G8R:
 658          return PACK_8A8B8G8R( r, g, b, a );
 659       case PF_8A8R8G8B:
 660          return PACK_8A8R8G8B( r, g, b, a );
 661       case PF_8R8G8B:
 662          /* fall through */
 663       case PF_8R8G8B24:
 664          return PACK_8R8G8B( r, g, b );
 665       case PF_5R6G5B:
 666          return PACK_5R6G5B( r, g, b );
 667       case PF_Dither_True:
 668          /* fall through */
 669       case PF_Dither_5R6G5B:
 670          {
 671             unsigned long p;
 672             PACK_TRUEDITHER(p, 1, 0, r, g, b);
 673             return p;
 674          }
 675       default:
 676          _mesa_problem(ctx, "Bad pixel format in xmesa_color_to_pixel");
 677    }
 678    return 0;
 679 }
 680
 681
 682 #define NUM_VISUAL_TYPES   6
 683
 684 /**
 685  * Convert an X visual type to a GLX visual type.
 686  *
 687  * \param visualType X visual type (i.e., \c TrueColor, \c StaticGray, etc.)
 688  *        to be converted.
 689  * \return If \c visualType is a valid X visual type, a GLX visual type will
 690  *         be returned.  Otherwise \c GLX_NONE will be returned.
 691  *
 692  * \note
 693  * This code was lifted directly from lib/GL/glx/glcontextmodes.c in the
 694  * DRI CVS tree.
 695  */
 696 static GLint
 697 xmesa_convert_from_x_visual_type( int visualType )
 698 {
 699     static const int glx_visual_types[ NUM_VISUAL_TYPES ] = {
 700         GLX_STATIC_GRAY,  GLX_GRAY_SCALE,
 701         GLX_STATIC_COLOR, GLX_PSEUDO_COLOR,
 702         GLX_TRUE_COLOR,   GLX_DIRECT_COLOR
 703     };
 704
 705     return ( (unsigned) visualType < NUM_VISUAL_TYPES )
 706         ? glx_visual_types[ visualType ] : GLX_NONE;
 707 }
 708
 709
 710 /**********************************************************************/
 711 /*****                       Public Functions                     *****/
 712 /**********************************************************************/
 713
 714
 715 /*
 716  * Create a new X/Mesa visual.
 717  * Input:  display - X11 display
 718  *         visinfo - an XVisualInfo pointer
 719  *         rgb_flag - GL_TRUE = RGB mode,
 720  *                    GL_FALSE = color index mode
 721  *         alpha_flag - alpha buffer requested?
 722  *         db_flag - GL_TRUE = double-buffered,
 723  *                   GL_FALSE = single buffered
 724  *         stereo_flag - stereo visual?
 725  *         ximage_flag - GL_TRUE = use an XImage for back buffer,
 726  *                       GL_FALSE = use an off-screen pixmap for back buffer
 727  *         depth_size - requested bits/depth values, or zero
 728  *         stencil_size - requested bits/stencil values, or zero
 729  *         accum_red_size - requested bits/red accum values, or zero
 730  *         accum_green_size - requested bits/green accum values, or zero
 731  *         accum_blue_size - requested bits/blue accum values, or zero
 732  *         accum_alpha_size - requested bits/alpha accum values, or zero
 733  *         num_samples - number of samples/pixel if multisampling, or zero
 734  *         level - visual level, usually 0
 735  *         visualCaveat - ala the GLX extension, usually GLX_NONE
 736  * Return;  a new XMesaVisual or 0 if error.
 737  */
 738 PUBLIC
 739 XMesaVisual XMesaCreateVisual( XMesaDisplay *display,
 740                                XMesaVisualInfo visinfo,
 741                                GLboolean rgb_flag,
 742                                GLboolean alpha_flag,
 743                                GLboolean db_flag,
 744                                GLboolean stereo_flag,
 745                                GLboolean ximage_flag,
 746                                GLint depth_size,
 747                                GLint stencil_size,
 748                                GLint accum_red_size,
 749                                GLint accum_green_size,
 750                                GLint accum_blue_size,
 751                                GLint accum_alpha_size,
 752                                GLint num_samples,
 753                                GLint level,
 754                                GLint visualCaveat )
 755 {
 756    char *gamma;
 757    XMesaVisual v;
 758    GLint red_bits, green_bits, blue_bits, alpha_bits;
 759
 760    /* For debugging only */
 761    if (_mesa_getenv("MESA_XSYNC")) {
 762       /* This makes debugging X easier.
 763        * In your debugger, set a breakpoint on _XError to stop when an
 764        * X protocol error is generated.
 765        */
 766       XSynchronize( display, 1 );
 767    }
 768
 769    /* Color-index rendering not supported. */
 770    if (!rgb_flag)
 771       return NULL;
 772
 773    v = (XMesaVisual) CALLOC_STRUCT(xmesa_visual);
 774    if (!v) {
 775       return NULL;
 776    }
 777
 778    v->display = display;
 779
 780    /* Save a copy of the XVisualInfo struct because the user may Xfree()
 781     * the struct but we may need some of the information contained in it
 782     * at a later time.
 783     */
 784    v->visinfo = (XVisualInfo *) MALLOC(sizeof(*visinfo));
 785    if(!v->visinfo) {
 786       free(v);
 787       return NULL;
 788    }
 789    memcpy(v->visinfo, visinfo, sizeof(*visinfo));
 790
 791    /* check for MESA_GAMMA environment variable */
 792    gamma = _mesa_getenv("MESA_GAMMA");
 793    if (gamma) {
 794       v->RedGamma = v->GreenGamma = v->BlueGamma = 0.0;
 795       sscanf( gamma, "%f %f %f", &v->RedGamma, &v->GreenGamma, &v->BlueGamma );
 796       if (v->RedGamma<=0.0)    v->RedGamma = 1.0;
 797       if (v->GreenGamma<=0.0)  v->GreenGamma = v->RedGamma;
 798       if (v->BlueGamma<=0.0)   v->BlueGamma = v->RedGamma;
 799    }
 800    else {
 801       v->RedGamma = v->GreenGamma = v->BlueGamma = 1.0;
 802    }
 803
 804    v->ximage_flag = ximage_flag;
 805
 806    v->mesa_visual.redMask = visinfo->red_mask;
 807    v->mesa_visual.greenMask = visinfo->green_mask;
 808    v->mesa_visual.blueMask = visinfo->blue_mask;
 809    v->visualID = visinfo->visualid;
 810    v->screen = visinfo->screen;
 811
 812 #if !(defined(__cplusplus) || defined(c_plusplus))
 813    v->visualType = xmesa_convert_from_x_visual_type(visinfo->class);
 814 #else
 815    v->visualType = xmesa_convert_from_x_visual_type(visinfo->c_class);
 816 #endif
 817
 818    v->mesa_visual.visualRating = visualCaveat;
 819
 820    if (alpha_flag)
 821       v->mesa_visual.alphaBits = 8;
 822
 823    (void) initialize_visual_and_buffer( v, NULL, 0, 0 );
 824
 825    {
 826       const int xclass = v->visualType;
 827       if (xclass == GLX_TRUE_COLOR || xclass == GLX_DIRECT_COLOR) {
 828          red_bits   = _mesa_bitcount(GET_REDMASK(v));
 829          green_bits = _mesa_bitcount(GET_GREENMASK(v));
 830          blue_bits  = _mesa_bitcount(GET_BLUEMASK(v));
 831       }
 832       else {
 833          /* this is an approximation */
 834          int depth;
 835          depth = GET_VISUAL_DEPTH(v);
 836          red_bits = depth / 3;
 837          depth -= red_bits;
 838          green_bits = depth / 2;
 839          depth -= green_bits;
 840          blue_bits = depth;
 841          alpha_bits = 0;
 842          assert( red_bits + green_bits + blue_bits == GET_VISUAL_DEPTH(v) );
 843       }
 844       alpha_bits = v->mesa_visual.alphaBits;
 845    }
 846
 847    _mesa_initialize_visual( &v->mesa_visual,
 848                             db_flag, stereo_flag,
 849                             red_bits, green_bits,
 850                             blue_bits, alpha_bits,
 851                             depth_size,
 852                             stencil_size,
 853                             accum_red_size, accum_green_size,
 854                             accum_blue_size, accum_alpha_size,
 855                             0 );
 856
 857    /* XXX minor hack */
 858    v->mesa_visual.level = level;
 859    return v;
 860 }
 861
 862
 863 PUBLIC
 864 void XMesaDestroyVisual( XMesaVisual v )
 865 {
 866    free(v->visinfo);
 867    free(v);
 868 }
 869
 870
 871
 872 /**
 873  * Create a new XMesaContext.
 874  * \param v  the XMesaVisual
 875  * \param share_list  another XMesaContext with which to share display
 876  *                    lists or NULL if no sharing is wanted.
 877  * \return an XMesaContext or NULL if error.
 878  */
 879 PUBLIC
 880 XMesaContext XMesaCreateContext( XMesaVisual v, XMesaContext share_list )
 881 {
 882    static GLboolean firstTime = GL_TRUE;
 883    XMesaContext c;
 884    struct gl_context *mesaCtx;
 885    struct dd_function_table functions;
 886    TNLcontext *tnl;
 887
 888    if (firstTime) {
 889       _glthread_INIT_MUTEX(_xmesa_lock);
 890       firstTime = GL_FALSE;
 891    }
 892
 893    /* Note: the XMesaContext contains a Mesa struct gl_context struct (inheritance) */
 894    c = (XMesaContext) CALLOC_STRUCT(xmesa_context);
 895    if (!c)
 896       return NULL;
 897
 898    mesaCtx = &(c->mesa);
 899
 900    /* initialize with default driver functions, then plug in XMesa funcs */
 901    _mesa_init_driver_functions(&functions);
 902    xmesa_init_driver_functions(v, &functions);
 903    if (!_mesa_initialize_context(mesaCtx, API_OPENGL, &v->mesa_visual,
 904                       share_list ? &(share_list->mesa) : (struct gl_context *) NULL,
 905                       &functions, (void *) c)) {
 906       free(c);
 907       return NULL;
 908    }
 909
 910    /* Enable this to exercise fixed function -> shader translation
 911     * with software rendering.
 912     */
 913    if (0) {
 914       mesaCtx->VertexProgram._MaintainTnlProgram = GL_TRUE;
 915       mesaCtx->FragmentProgram._MaintainTexEnvProgram = GL_TRUE;
 916    }
 917
 918    _mesa_enable_sw_extensions(mesaCtx);
 919    _mesa_enable_1_3_extensions(mesaCtx);
 920    _mesa_enable_1_4_extensions(mesaCtx);
 921    _mesa_enable_1_5_extensions(mesaCtx);
 922    _mesa_enable_2_0_extensions(mesaCtx);
 923    _mesa_enable_2_1_extensions(mesaCtx);
 924 #if ENABLE_EXT_texure_compression_s3tc
 925     if (mesaCtx->Mesa_DXTn) {
 926        _mesa_enable_extension(mesaCtx, "GL_EXT_texture_compression_s3tc");
 927        _mesa_enable_extension(mesaCtx, "GL_S3_s3tc");
 928     }
 929     _mesa_enable_extension(mesaCtx, "GL_3DFX_texture_compression_FXT1");
 930 #endif
 931 #if ENABLE_EXT_timer_query
 932     _mesa_enable_extension(mesaCtx, "GL_EXT_timer_query");
 933 #endif
 934
 935
 936    /* finish up xmesa context initializations */
 937    c->swapbytes = CHECK_BYTE_ORDER(v) ? GL_FALSE : GL_TRUE;
 938    c->xm_visual = v;
 939    c->xm_buffer = NULL;   /* set later by XMesaMakeCurrent */
 940    c->display = v->display;
 941    c->pixelformat = v->dithered_pf;      /* Dithering is enabled by default */
 942
 943    /* Initialize the software rasterizer and helper modules.
 944     */
 945    if (!_swrast_CreateContext( mesaCtx ) ||
 946        !_vbo_CreateContext( mesaCtx ) ||
 947        !_tnl_CreateContext( mesaCtx ) ||
 948        !_swsetup_CreateContext( mesaCtx )) {
 949       _mesa_free_context_data(&c->mesa);
 950       free(c);
 951       return NULL;
 952    }
 953
 954    /* tnl setup */
 955    tnl = TNL_CONTEXT(mesaCtx);
 956    tnl->Driver.RunPipeline = _tnl_run_pipeline;
 957    /* swrast setup */
 958    xmesa_register_swrast_functions( mesaCtx );
 959    _swsetup_Wakeup(mesaCtx);
 960
 961    _mesa_meta_init(mesaCtx);
 962
 963    return c;
 964 }
 965
 966
 967
 968 PUBLIC
 969 void XMesaDestroyContext( XMesaContext c )
 970 {
 971    struct gl_context *mesaCtx = &c->mesa;
 972
 973    _mesa_meta_free( mesaCtx );
 974
 975    _swsetup_DestroyContext( mesaCtx );
 976    _swrast_DestroyContext( mesaCtx );
 977    _tnl_DestroyContext( mesaCtx );
 978    _vbo_DestroyContext( mesaCtx );
 979    _mesa_free_context_data( mesaCtx );
 980    free( c );
 981 }
 982
 983
 984
 985 /**
 986  * Private function for creating an XMesaBuffer which corresponds to an
 987  * X window or pixmap.
 988  * \param v  the window's XMesaVisual
 989  * \param w  the window we're wrapping
 990  * \return  new XMesaBuffer or NULL if error
 991  */
 992 PUBLIC XMesaBuffer
 993 XMesaCreateWindowBuffer(XMesaVisual v, XMesaWindow w)
 994 {
 995    XWindowAttributes attr;
 996    XMesaBuffer b;
 997    XMesaColormap cmap;
 998    int depth;
 999
1000    assert(v);
1001    assert(w);
1002
1003    /* Check that window depth matches visual depth */
1004    XGetWindowAttributes( v->display, w, &attr );
1005    depth = attr.depth;
1006    if (GET_VISUAL_DEPTH(v) != depth) {
1007       _mesa_warning(NULL, "XMesaCreateWindowBuffer: depth mismatch between visual (%d) and window (%d)!\n",
1008                     GET_VISUAL_DEPTH(v), depth);
1009       return NULL;
1010    }
1011
1012    /* Find colormap */
1013    if (attr.colormap) {
1014       cmap = attr.colormap;
1015    }
1016    else {
1017       _mesa_warning(NULL, "Window %u has no colormap!\n", (unsigned int) w);
1018       /* this is weird, a window w/out a colormap!? */
1019       /* OK, let's just allocate a new one and hope for the best */
1020       cmap = XCreateColormap(v->display, w, attr.visual, AllocNone);
1021    }
1022
1023    b = create_xmesa_buffer((XMesaDrawable) w, WINDOW, v, cmap);
1024    if (!b)
1025       return NULL;
1026
1027    if (!initialize_visual_and_buffer( v, b, (XMesaDrawable) w, cmap )) {
1028       xmesa_free_buffer(b);
1029       return NULL;
1030    }
1031
1032    return b;
1033 }
1034
1035
1036
1037 /**
1038  * Create a new XMesaBuffer from an X pixmap.
1039  *
1040  * \param v    the XMesaVisual
1041  * \param p    the pixmap
1042  * \param cmap the colormap, may be 0 if using a \c GLX_TRUE_COLOR or
1043  *             \c GLX_DIRECT_COLOR visual for the pixmap
1044  * \returns new XMesaBuffer or NULL if error
1045  */
1046 PUBLIC XMesaBuffer
1047 XMesaCreatePixmapBuffer(XMesaVisual v, XMesaPixmap p, XMesaColormap cmap)
1048 {
1049    XMesaBuffer b;
1050
1051    assert(v);
1052
1053    b = create_xmesa_buffer((XMesaDrawable) p, PIXMAP, v, cmap);
1054    if (!b)
1055       return NULL;
1056
1057    if (!initialize_visual_and_buffer(v, b, (XMesaDrawable) p, cmap)) {
1058       xmesa_free_buffer(b);
1059       return NULL;
1060    }
1061
1062    return b;
1063 }
1064
1065
1066 /**
1067  * For GLX_EXT_texture_from_pixmap
1068  */
1069 XMesaBuffer
1070 XMesaCreatePixmapTextureBuffer(XMesaVisual v, XMesaPixmap p,
1071                                XMesaColormap cmap,
1072                                int format, int target, int mipmap)
1073 {
1074    GET_CURRENT_CONTEXT(ctx);
1075    XMesaBuffer b;
1076    GLuint width, height;
1077
1078    assert(v);
1079
1080    b = create_xmesa_buffer((XMesaDrawable) p, PIXMAP, v, cmap);
1081    if (!b)
1082       return NULL;
1083
1084    /* get pixmap size, update framebuffer/renderbuffer dims */
1085    xmesa_get_window_size(v->display, b, &width, &height);
1086    _mesa_resize_framebuffer(NULL, &(b->mesa_buffer), width, height);
1087
1088    if (target == 0) {
1089       /* examine dims */
1090       if (ctx->Extensions.ARB_texture_non_power_of_two) {
1091          target = GLX_TEXTURE_2D_EXT;
1092       }
1093       else if (   _mesa_bitcount(width)  == 1
1094                && _mesa_bitcount(height) == 1) {
1095          /* power of two size */
1096          if (height == 1) {
1097             target = GLX_TEXTURE_1D_EXT;
1098          }
1099          else {
1100             target = GLX_TEXTURE_2D_EXT;
1101          }
1102       }
1103       else if (ctx->Extensions.NV_texture_rectangle) {
1104          target = GLX_TEXTURE_RECTANGLE_EXT;
1105       }
1106       else {
1107          /* non power of two textures not supported */
1108          XMesaDestroyBuffer(b);
1109          return 0;
1110       }
1111    }
1112
1113    b->TextureTarget = target;
1114    b->TextureFormat = format;
1115    b->TextureMipmap = mipmap;
1116
1117    if (!initialize_visual_and_buffer(v, b, (XMesaDrawable) p, cmap)) {
1118       xmesa_free_buffer(b);
1119       return NULL;
1120    }
1121
1122    return b;
1123 }
1124
1125
1126
1127 XMesaBuffer
1128 XMesaCreatePBuffer(XMesaVisual v, XMesaColormap cmap,
1129                    unsigned int width, unsigned int height)
1130 {
1131    XMesaWindow root;
1132    XMesaDrawable drawable;  /* X Pixmap Drawable */
1133    XMesaBuffer b;
1134
1135    /* allocate pixmap for front buffer */
1136    root = RootWindow( v->display, v->visinfo->screen );
1137    drawable = XCreatePixmap(v->display, root, width, height,
1138                             v->visinfo->depth);
1139    if (!drawable)
1140       return NULL;
1141
1142    b = create_xmesa_buffer(drawable, PBUFFER, v, cmap);
1143    if (!b)
1144       return NULL;
1145
1146    if (!initialize_visual_and_buffer(v, b, drawable, cmap)) {
1147       xmesa_free_buffer(b);
1148       return NULL;
1149    }
1150
1151    return b;
1152 }
1153
1154
1155
1156 /*
1157  * Deallocate an XMesaBuffer structure and all related info.
1158  */
1159 PUBLIC void
1160 XMesaDestroyBuffer(XMesaBuffer b)
1161 {
1162    xmesa_free_buffer(b);
1163 }
1164
1165
1166 /**
1167  * Query the current window size and update the corresponding struct gl_framebuffer
1168  * and all attached renderbuffers.
1169  * Called when:
1170  *  1. the first time a buffer is bound to a context.
1171  *  2. from glViewport to poll for window size changes
1172  *  3. from the XMesaResizeBuffers() API function.
1173  * Note: it's possible (and legal) for xmctx to be NULL.  That can happen
1174  * when resizing a buffer when no rendering context is bound.
1175  */
1176 void
1177 xmesa_check_and_update_buffer_size(XMesaContext xmctx, XMesaBuffer drawBuffer)
1178 {
1179    GLuint width, height;
1180    xmesa_get_window_size(drawBuffer->display, drawBuffer, &width, &height);
1181    if (drawBuffer->mesa_buffer.Width != width ||
1182        drawBuffer->mesa_buffer.Height != height) {
1183       struct gl_context *ctx = xmctx ? &xmctx->mesa : NULL;
1184       _mesa_resize_framebuffer(ctx, &(drawBuffer->mesa_buffer), width, height);
1185    }
1186    drawBuffer->mesa_buffer.Initialized = GL_TRUE; /* XXX TEMPORARY? */
1187 }
1188
1189
1190 /*
1191  * Bind buffer b to context c and make c the current rendering context.
1192  */
1193 GLboolean XMesaMakeCurrent( XMesaContext c, XMesaBuffer b )
1194 {
1195    return XMesaMakeCurrent2( c, b, b );
1196 }
1197
1198
1199 /*
1200  * Bind buffer b to context c and make c the current rendering context.
1201  */
1202 PUBLIC
1203 GLboolean XMesaMakeCurrent2( XMesaContext c, XMesaBuffer drawBuffer,
1204                              XMesaBuffer readBuffer )
1205 {
1206    if (c) {
1207       if (!drawBuffer || !readBuffer)
1208          return GL_FALSE;  /* must specify buffers! */
1209
1210       if (&(c->mesa) == _mesa_get_current_context()
1211           && c->mesa.DrawBuffer == &drawBuffer->mesa_buffer
1212           && c->mesa.ReadBuffer == &readBuffer->mesa_buffer
1213           && XMESA_BUFFER(c->mesa.DrawBuffer)->wasCurrent) {
1214          /* same context and buffer, do nothing */
1215          return GL_TRUE;
1216       }
1217
1218       c->xm_buffer = drawBuffer;
1219
1220       /* Call this periodically to detect when the user has begun using
1221        * GL rendering from multiple threads.
1222        */
1223       _glapi_check_multithread();
1224
1225       xmesa_check_and_update_buffer_size(c, drawBuffer);
1226       if (readBuffer != drawBuffer)
1227          xmesa_check_and_update_buffer_size(c, readBuffer);
1228
1229       _mesa_make_current(&(c->mesa),
1230                          &drawBuffer->mesa_buffer,
1231                          &readBuffer->mesa_buffer);
1232
1233       /*
1234        * Must recompute and set these pixel values because colormap
1235        * can be different for different windows.
1236        */
1237       c->clearpixel = xmesa_color_to_pixel( &c->mesa,
1238                                             c->clearcolor[0],
1239                                             c->clearcolor[1],
1240                                             c->clearcolor[2],
1241                                             c->clearcolor[3],
1242                                             c->xm_visual->undithered_pf);
1243       XMesaSetForeground(c->display, drawBuffer->cleargc, c->clearpixel);
1244
1245       /* Solution to Stephane Rehel's problem with glXReleaseBuffersMESA(): */
1246       drawBuffer->wasCurrent = GL_TRUE;
1247    }
1248    else {
1249       /* Detach */
1250       _mesa_make_current( NULL, NULL, NULL );
1251    }
1252    return GL_TRUE;
1253 }
1254
1255
1256 /*
1257  * Unbind the context c from its buffer.
1258  */
1259 GLboolean XMesaUnbindContext( XMesaContext c )
1260 {
1261    /* A no-op for XFree86 integration purposes */
1262    return GL_TRUE;
1263 }
1264
1265
1266 XMesaContext XMesaGetCurrentContext( void )
1267 {
1268    GET_CURRENT_CONTEXT(ctx);
1269    if (ctx) {
1270       XMesaContext xmesa = XMESA_CONTEXT(ctx);
1271       return xmesa;
1272    }
1273    else {
1274       return 0;
1275    }
1276 }
1277
1278
1279 XMesaBuffer XMesaGetCurrentBuffer( void )
1280 {
1281    GET_CURRENT_CONTEXT(ctx);
1282    if (ctx) {
1283       XMesaBuffer xmbuf = XMESA_BUFFER(ctx->DrawBuffer);
1284       return xmbuf;
1285    }
1286    else {
1287       return 0;
1288    }
1289 }
1290
1291
1292 /* New in Mesa 3.1 */
1293 XMesaBuffer XMesaGetCurrentReadBuffer( void )
1294 {
1295    GET_CURRENT_CONTEXT(ctx);
1296    if (ctx) {
1297       return XMESA_BUFFER(ctx->ReadBuffer);
1298    }
1299    else {
1300       return 0;
1301    }
1302 }
1303
1304
1305
1306 GLboolean XMesaSetFXmode( GLint mode )
1307 {
1308    (void) mode;
1309    return GL_FALSE;
1310 }
1311
1312
1313
1314 /*
1315  * Copy the back buffer to the front buffer.  If there's no back buffer
1316  * this is a no-op.
1317  */
1318 PUBLIC
1319 void XMesaSwapBuffers( XMesaBuffer b )
1320 {
1321    GET_CURRENT_CONTEXT(ctx);
1322
1323    if (!b->backxrb) {
1324       /* single buffered */
1325       return;
1326    }
1327
1328    /* If we're swapping the buffer associated with the current context
1329     * we have to flush any pending rendering commands first.
1330     */
1331    if (ctx && ctx->DrawBuffer == &(b->mesa_buffer))
1332       _mesa_notifySwapBuffers(ctx);
1333
1334    if (b->db_mode) {
1335       if (b->backxrb->ximage) {
1336          /* Copy Ximage (back buf) from client memory to server window */
1337 #if defined(USE_XSHM)
1338          if (b->shm) {
1339             /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
1340             XShmPutImage( b->xm_visual->display, b->frontxrb->drawable,
1341                           b->swapgc,
1342                           b->backxrb->ximage, 0, 0,
1343                           0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height,
1344                           False );
1345             /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
1346          }
1347          else
1348 #endif
1349          {
1350             /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
1351             XMesaPutImage( b->xm_visual->display, b->frontxrb->drawable,
1352                            b->swapgc,
1353                            b->backxrb->ximage, 0, 0,
1354                            0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height );
1355             /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
1356          }
1357       }
1358       else if (b->backxrb->pixmap) {
1359          /* Copy pixmap (back buf) to window (front buf) on server */
1360          /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
1361          XMesaCopyArea( b->xm_visual->display,
1362                         b->backxrb->pixmap,   /* source drawable */
1363                         b->frontxrb->drawable,  /* dest. drawable */
1364                         b->swapgc,
1365                         0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height,
1366                         0, 0                 /* dest region */
1367                       );
1368          /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
1369       }
1370    }
1371    XSync( b->xm_visual->display, False );
1372 }
1373
1374
1375
1376 /*
1377  * Copy sub-region of back buffer to front buffer
1378  */
1379 void XMesaCopySubBuffer( XMesaBuffer b, int x, int y, int width, int height )
1380 {
1381    GET_CURRENT_CONTEXT(ctx);
1382
1383    /* If we're swapping the buffer associated with the current context
1384     * we have to flush any pending rendering commands first.
1385     */
1386    if (ctx && ctx->DrawBuffer == &(b->mesa_buffer))
1387       _mesa_notifySwapBuffers(ctx);
1388
1389    if (!b->backxrb) {
1390       /* single buffered */
1391       return;
1392    }
1393
1394    if (b->db_mode) {
1395       int yTop = b->mesa_buffer.Height - y - height;
1396       if (b->backxrb->ximage) {
1397          /* Copy Ximage from host's memory to server's window */
1398 #if defined(USE_XSHM)
1399          if (b->shm) {
1400             /* XXX assuming width and height aren't too large! */
1401             XShmPutImage( b->xm_visual->display, b->frontxrb->drawable,
1402                           b->swapgc,
1403                           b->backxrb->ximage, x, yTop,
1404                           x, yTop, width, height, False );
1405             /* wait for finished event??? */
1406          }
1407          else
1408 #endif
1409          {
1410             /* XXX assuming width and height aren't too large! */
1411             XMesaPutImage( b->xm_visual->display, b->frontxrb->drawable,
1412                            b->swapgc,
1413                            b->backxrb->ximage, x, yTop,
1414                            x, yTop, width, height );
1415          }
1416       }
1417       else {
1418          /* Copy pixmap to window on server */
1419          XMesaCopyArea( b->xm_visual->display,
1420                         b->backxrb->pixmap,           /* source drawable */
1421                         b->frontxrb->drawable,        /* dest. drawable */
1422                         b->swapgc,
1423                         x, yTop, width, height,  /* source region */
1424                         x, yTop                  /* dest region */
1425                       );
1426       }
1427    }
1428 }
1429
1430
1431 /*
1432  * Return a pointer to the XMesa backbuffer Pixmap or XImage.  This function
1433  * is a way to get "under the hood" of X/Mesa so one can manipulate the
1434  * back buffer directly.
1435  * Output:  pixmap - pointer to back buffer's Pixmap, or 0
1436  *          ximage - pointer to back buffer's XImage, or NULL
1437  * Return:  GL_TRUE = context is double buffered
1438  *          GL_FALSE = context is single buffered
1439  */
1440 GLboolean XMesaGetBackBuffer( XMesaBuffer b,
1441                               XMesaPixmap *pixmap,
1442                               XMesaImage **ximage )
1443 {
1444    if (b->db_mode) {
1445       if (pixmap)
1446          *pixmap = b->backxrb->pixmap;
1447       if (ximage)
1448          *ximage = b->backxrb->ximage;
1449       return GL_TRUE;
1450    }
1451    else {
1452       *pixmap = 0;
1453       *ximage = NULL;
1454       return GL_FALSE;
1455    }
1456 }
1457
1458
1459 /*
1460  * Return the depth buffer associated with an XMesaBuffer.
1461  * Input:  b - the XMesa buffer handle
1462  * Output:  width, height - size of buffer in pixels
1463  *          bytesPerValue - bytes per depth value (2 or 4)
1464  *          buffer - pointer to depth buffer values
1465  * Return:  GL_TRUE or GL_FALSE to indicate success or failure.
1466  */
1467 GLboolean XMesaGetDepthBuffer( XMesaBuffer b, GLint *width, GLint *height,
1468                                GLint *bytesPerValue, void **buffer )
1469 {
1470    struct gl_renderbuffer *rb
1471       = b->mesa_buffer.Attachment[BUFFER_DEPTH].Renderbuffer;
1472    struct xmesa_renderbuffer *xrb = xmesa_renderbuffer(rb);
1473
1474    if (!xrb || !xrb->Base.Buffer) {
1475       *width = 0;
1476       *height = 0;
1477       *bytesPerValue = 0;
1478       *buffer = 0;
1479       return GL_FALSE;
1480    }
1481    else {
1482       *width = b->mesa_buffer.Width;
1483       *height = b->mesa_buffer.Height;
1484       *bytesPerValue = b->mesa_buffer.Visual.depthBits <= 16
1485          ? sizeof(GLushort) : sizeof(GLuint);
1486       *buffer = (void *) xrb->Base.Buffer;
1487       return GL_TRUE;
1488    }
1489 }
1490
1491
1492 void XMesaFlush( XMesaContext c )
1493 {
1494    if (c && c->xm_visual) {
1495       XSync( c->xm_visual->display, False );
1496    }
1497 }
1498
1499
1500
1501 const char *XMesaGetString( XMesaContext c, int name )
1502 {
1503    (void) c;
1504    if (name==XMESA_VERSION) {
1505       return "5.0";
1506    }
1507    else if (name==XMESA_EXTENSIONS) {
1508       return "";
1509    }
1510    else {
1511       return NULL;
1512    }
1513 }
1514
1515
1516
1517 XMesaBuffer XMesaFindBuffer( XMesaDisplay *dpy, XMesaDrawable d )
1518 {
1519    XMesaBuffer b;
1520    for (b=XMesaBufferList; b; b=b->Next) {
1521       if (b->frontxrb->drawable == d && b->display == dpy) {
1522          return b;
1523       }
1524    }
1525    return NULL;
1526 }
1527
1528
1529 /**
1530  * Free/destroy all XMesaBuffers associated with given display.
1531  */
1532 void xmesa_destroy_buffers_on_display(XMesaDisplay *dpy)
1533 {
1534    XMesaBuffer b, next;
1535    for (b = XMesaBufferList; b; b = next) {
1536       next = b->Next;
1537       if (b->display == dpy) {
1538          xmesa_free_buffer(b);
1539       }
1540    }
1541 }
1542
1543
1544 /*
1545  * Look for XMesaBuffers whose X window has been destroyed.
1546  * Deallocate any such XMesaBuffers.
1547  */
1548 void XMesaGarbageCollect( XMesaDisplay* dpy )
1549 {
1550    XMesaBuffer b, next;
1551    for (b=XMesaBufferList; b; b=next) {
1552       next = b->Next;
1553       if (b->display && b->display == dpy && b->frontxrb->drawable && b->type == WINDOW) {
1554          XSync(b->display, False);
1555          if (!window_exists( b->display, b->frontxrb->drawable )) {
1556             /* found a dead window, free the ancillary info */
1557             XMesaDestroyBuffer( b );
1558          }
1559       }
1560    }
1561 }
1562
1563
1564 unsigned long XMesaDitherColor( XMesaContext xmesa, GLint x, GLint y,
1565                                 GLfloat red, GLfloat green,
1566                                 GLfloat blue, GLfloat alpha )
1567 {
1568    GLint r = (GLint) (red   * 255.0F);
1569    GLint g = (GLint) (green * 255.0F);
1570    GLint b = (GLint) (blue  * 255.0F);
1571    GLint a = (GLint) (alpha * 255.0F);
1572
1573    switch (xmesa->pixelformat) {
1574       case PF_Truecolor:
1575          {
1576             unsigned long p;
1577             PACK_TRUECOLOR( p, r, g, b );
1578             return p;
1579          }
1580       case PF_8A8B8G8R:
1581          return PACK_8A8B8G8R( r, g, b, a );
1582       case PF_8A8R8G8B:
1583          return PACK_8A8R8G8B( r, g, b, a );
1584       case PF_8R8G8B:
1585          return PACK_8R8G8B( r, g, b );
1586       case PF_5R6G5B:
1587          return PACK_5R6G5B( r, g, b );
1588       case PF_Dither_5R6G5B:
1589          /* fall through */
1590       case PF_Dither_True:
1591          {
1592             unsigned long p;
1593             PACK_TRUEDITHER(p, x, y, r, g, b);
1594             return p;
1595          }
1596       default:
1597          _mesa_problem(NULL, "Bad pixel format in XMesaDitherColor");
1598    }
1599    return 0;
1600 }
1601
1602
1603 /*
1604  * This is typically called when the window size changes and we need
1605  * to reallocate the buffer's back/depth/stencil/accum buffers.
1606  */
1607 PUBLIC void
1608 XMesaResizeBuffers( XMesaBuffer b )
1609 {
1610    GET_CURRENT_CONTEXT(ctx);
1611    XMesaContext xmctx = XMESA_CONTEXT(ctx);
1612    if (!xmctx)
1613       return;
1614    xmesa_check_and_update_buffer_size(xmctx, b);
1615 }
1616
1617
1618 static GLint
1619 xbuffer_to_renderbuffer(int buffer)
1620 {
1621    assert(MAX_AUX_BUFFERS <= 4);
1622
1623    switch (buffer) {
1624    case GLX_FRONT_LEFT_EXT:
1625       return BUFFER_FRONT_LEFT;
1626    case GLX_FRONT_RIGHT_EXT:
1627       return BUFFER_FRONT_RIGHT;
1628    case GLX_BACK_LEFT_EXT:
1629       return BUFFER_BACK_LEFT;
1630    case GLX_BACK_RIGHT_EXT:
1631       return BUFFER_BACK_RIGHT;
1632    case GLX_AUX0_EXT:
1633       return BUFFER_AUX0;
1634    case GLX_AUX1_EXT:
1635    case GLX_AUX2_EXT:
1636    case GLX_AUX3_EXT:
1637    case GLX_AUX4_EXT:
1638    case GLX_AUX5_EXT:
1639    case GLX_AUX6_EXT:
1640    case GLX_AUX7_EXT:
1641    case GLX_AUX8_EXT:
1642    case GLX_AUX9_EXT:
1643    default:
1644       /* BadValue error */
1645       return -1;
1646    }
1647 }
1648
1649
1650 PUBLIC void
1651 XMesaBindTexImage(XMesaDisplay *dpy, XMesaBuffer drawable, int buffer,
1652                   const int *attrib_list)
1653 {
1654 #if 0
1655    GET_CURRENT_CONTEXT(ctx);
1656    const GLuint unit = ctx->Texture.CurrentUnit;
1657    struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
1658    struct gl_texture_object *texObj;
1659 #endif
1660    struct gl_renderbuffer *rb;
1661    struct xmesa_renderbuffer *xrb;
1662    GLint b;
1663    XMesaImage *img = NULL;
1664    GLboolean freeImg = GL_FALSE;
1665
1666    b = xbuffer_to_renderbuffer(buffer);
1667    if (b < 0)
1668       return;
1669
1670    if (drawable->TextureFormat == GLX_TEXTURE_FORMAT_NONE_EXT)
1671       return; /* BadMatch error */
1672
1673    rb = drawable->mesa_buffer.Attachment[b].Renderbuffer;
1674    if (!rb) {
1675       /* invalid buffer */
1676       return;
1677    }
1678    xrb = xmesa_renderbuffer(rb);
1679
1680 #if 0
1681    switch (drawable->TextureTarget) {
1682    case GLX_TEXTURE_1D_EXT:
1683       texObj = texUnit->CurrentTex[TEXTURE_1D_INDEX];
1684       break;
1685    case GLX_TEXTURE_2D_EXT:
1686       texObj = texUnit->CurrentTex[TEXTURE_2D_INDEX];
1687       break;
1688    case GLX_TEXTURE_RECTANGLE_EXT:
1689       texObj = texUnit->CurrentTex[TEXTURE_RECT_INDEX];
1690       break;
1691    default:
1692       return; /* BadMatch error */
1693    }
1694 #endif
1695
1696    /*
1697     * The following is a quick and simple way to implement
1698     * BindTexImage.  The better way is to write some new FetchTexel()
1699     * functions which would extract texels from XImages.  We'd still
1700     * need to use GetImage when texturing from a Pixmap (front buffer)
1701     * but texturing from a back buffer (XImage) would avoid an image
1702     * copy.
1703     */
1704
1705    /* get XImage */
1706    if (xrb->pixmap) {
1707       img = XMesaGetImage(dpy, xrb->pixmap, 0, 0, rb->Width, rb->Height, ~0L,
1708                           ZPixmap);
1709       freeImg = GL_TRUE;
1710    }
1711    else if (xrb->ximage) {
1712       img = xrb->ximage;
1713    }
1714
1715    /* store the XImage as a new texture image */
1716    if (img) {
1717       GLenum format, type, intFormat;
1718       if (img->bits_per_pixel == 32) {
1719          format = GL_BGRA;
1720          type = GL_UNSIGNED_BYTE;
1721          intFormat = GL_RGBA;
1722       }
1723       else if (img->bits_per_pixel == 24) {
1724          format = GL_BGR;
1725          type = GL_UNSIGNED_BYTE;
1726          intFormat = GL_RGB;
1727       }
1728       else if (img->bits_per_pixel == 16) {
1729          format = GL_BGR;
1730          type = GL_UNSIGNED_SHORT_5_6_5;
1731          intFormat = GL_RGB;
1732       }
1733       else {
1734          _mesa_problem(NULL, "Unexpected XImage format in XMesaBindTexImage");
1735          return;
1736       }
1737       if (drawable->TextureFormat == GLX_TEXTURE_FORMAT_RGBA_EXT) {
1738          intFormat = GL_RGBA;
1739       }
1740       else if (drawable->TextureFormat == GLX_TEXTURE_FORMAT_RGB_EXT) {
1741          intFormat = GL_RGB;
1742       }
1743
1744       _mesa_TexImage2D(GL_TEXTURE_2D, 0, intFormat, rb->Width, rb->Height, 0,
1745                        format, type, img->data);
1746
1747       if (freeImg) {
1748          XMesaDestroyImage(img);
1749       }
1750    }
1751 }
1752
1753
1754
1755 PUBLIC void
1756 XMesaReleaseTexImage(XMesaDisplay *dpy, XMesaBuffer drawable, int buffer)
1757 {
1758    const GLint b = xbuffer_to_renderbuffer(buffer);
1759    if (b < 0)
1760       return;
1761
1762    /* no-op for now */
1763 }
1764