src/gallium/state_trackers/glx/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 "xm_api.h"
  61 #include "main/context.h"
  62 #include "main/framebuffer.h"
  63
  64 #include "state_tracker/st_public.h"
  65 #include "state_tracker/st_context.h"
  66 #include "pipe/p_defines.h"
  67 #include "pipe/p_screen.h"
  68 #include "pipe/p_context.h"
  69
  70 #include "xm_winsys.h"
  71 #include <GL/glx.h>
  72
  73
  74 /* Driver interface routines, set up by xlib backend on library
  75  * _init().  These are global in the same way that function names are
  76  * global.
  77  */
  78 static struct xm_driver driver;
  79
  80 void xmesa_set_driver( const struct xm_driver *templ )
  81 {
  82    driver = *templ;
  83 }
  84
  85 /**
  86  * Global X driver lock
  87  */
  88 pipe_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 int xmesa_check_for_xshm( Display *display )
 115 {
 116 #if defined(USE_XSHM)
 117    int major, minor, ignore;
 118    Bool pixmaps;
 119
 120    if (getenv("SP_NO_RAST"))
 121       return 0;
 122
 123    if (getenv("MESA_NOSHM")) {
 124       return 0;
 125    }
 126
 127    if (XQueryExtension( display, "MIT-SHM", &ignore, &ignore, &ignore )) {
 128       if (XShmQueryVersion( display, &major, &minor, &pixmaps )==True) {
 129          return (pixmaps==True) ? 2 : 1;
 130       }
 131       else {
 132          return 0;
 133       }
 134    }
 135    else {
 136       return 0;
 137    }
 138 #else
 139    /* No  XSHM support */
 140    return 0;
 141 #endif
 142 }
 143
 144
 145 /**
 146  * Return the true number of bits per pixel for XImages.
 147  * For example, if we request a 24-bit deep visual we may actually need/get
 148  * 32bpp XImages.  This function returns the appropriate bpp.
 149  * Input:  dpy - the X display
 150  *         visinfo - desribes the visual to be used for XImages
 151  * Return:  true number of bits per pixel for XImages
 152  */
 153 static int
 154 bits_per_pixel( XMesaVisual xmv )
 155 {
 156    Display *dpy = xmv->display;
 157    XVisualInfo * visinfo = xmv->visinfo;
 158    XImage *img;
 159    int bitsPerPixel;
 160    /* Create a temporary XImage */
 161    img = XCreateImage( dpy, visinfo->visual, visinfo->depth,
 162                        ZPixmap, 0,           /*format, offset*/
 163                        (char*) MALLOC(8),    /*data*/
 164                        1, 1,                 /*width, height*/
 165                        32,                   /*bitmap_pad*/
 166                        0                     /*bytes_per_line*/
 167                      );
 168    assert(img);
 169    /* grab the bits/pixel value */
 170    bitsPerPixel = img->bits_per_pixel;
 171    /* free the XImage */
 172    _mesa_free( img->data );
 173    img->data = NULL;
 174    XDestroyImage( img );
 175    return bitsPerPixel;
 176 }
 177
 178
 179
 180 /*
 181  * Determine if a given X window ID is valid (window exists).
 182  * Do this by calling XGetWindowAttributes() for the window and
 183  * checking if we catch an X error.
 184  * Input:  dpy - the display
 185  *         win - the window to check for existance
 186  * Return:  GL_TRUE - window exists
 187  *          GL_FALSE - window doesn't exist
 188  */
 189 static GLboolean WindowExistsFlag;
 190
 191 static int window_exists_err_handler( Display* dpy, XErrorEvent* xerr )
 192 {
 193    (void) dpy;
 194    if (xerr->error_code == BadWindow) {
 195       WindowExistsFlag = GL_FALSE;
 196    }
 197    return 0;
 198 }
 199
 200 static GLboolean window_exists( Display *dpy, Window win )
 201 {
 202    XWindowAttributes wa;
 203    int (*old_handler)( Display*, XErrorEvent* );
 204    WindowExistsFlag = GL_TRUE;
 205    old_handler = XSetErrorHandler(window_exists_err_handler);
 206    XGetWindowAttributes( dpy, win, &wa ); /* dummy request */
 207    XSetErrorHandler(old_handler);
 208    return WindowExistsFlag;
 209 }
 210
 211 static Status
 212 get_drawable_size( Display *dpy, Drawable d, uint *width, uint *height )
 213 {
 214    Window root;
 215    Status stat;
 216    int xpos, ypos;
 217    unsigned int w, h, bw, depth;
 218    stat = XGetGeometry(dpy, d, &root, &xpos, &ypos, &w, &h, &bw, &depth);
 219    *width = w;
 220    *height = h;
 221    return stat;
 222 }
 223
 224
 225 /**
 226  * Return the size of the window (or pixmap) that corresponds to the
 227  * given XMesaBuffer.
 228  * \param width  returns width in pixels
 229  * \param height  returns height in pixels
 230  */
 231 static void
 232 xmesa_get_window_size(Display *dpy, XMesaBuffer b,
 233                       GLuint *width, GLuint *height)
 234 {
 235    Status stat;
 236
 237    pipe_mutex_lock(_xmesa_lock);
 238    XSync(b->xm_visual->display, 0); /* added for Chromium */
 239    stat = get_drawable_size(dpy, b->drawable, width, height);
 240    pipe_mutex_unlock(_xmesa_lock);
 241
 242    if (!stat) {
 243       /* probably querying a window that's recently been destroyed */
 244       _mesa_warning(NULL, "XGetGeometry failed!\n");
 245       *width = *height = 1;
 246    }
 247 }
 248
 249 #define GET_REDMASK(__v)        __v->mesa_visual.redMask
 250 #define GET_GREENMASK(__v)      __v->mesa_visual.greenMask
 251 #define GET_BLUEMASK(__v)       __v->mesa_visual.blueMask
 252
 253
 254 /**
 255  * Choose the pixel format for the given visual.
 256  * This will tell the gallium driver how to pack pixel data into
 257  * drawing surfaces.
 258  */
 259 static GLuint
 260 choose_pixel_format(XMesaVisual v)
 261 {
 262    boolean native_byte_order = (host_byte_order() ==
 263                                 ImageByteOrder(v->display));
 264
 265    if (   GET_REDMASK(v)   == 0x0000ff
 266        && GET_GREENMASK(v) == 0x00ff00
 267        && GET_BLUEMASK(v)  == 0xff0000
 268        && v->BitsPerPixel == 32) {
 269       if (native_byte_order) {
 270          /* no byteswapping needed */
 271          return 0 /* PIXEL_FORMAT_U_A8_B8_G8_R8 */;
 272       }
 273       else {
 274          return PIPE_FORMAT_R8G8B8A8_UNORM;
 275       }
 276    }
 277    else if (   GET_REDMASK(v)   == 0xff0000
 278             && GET_GREENMASK(v) == 0x00ff00
 279             && GET_BLUEMASK(v)  == 0x0000ff
 280             && v->BitsPerPixel == 32) {
 281       if (native_byte_order) {
 282          /* no byteswapping needed */
 283          return PIPE_FORMAT_A8R8G8B8_UNORM;
 284       }
 285       else {
 286          return PIPE_FORMAT_B8G8R8A8_UNORM;
 287       }
 288    }
 289    else if (   GET_REDMASK(v)   == 0xf800
 290             && GET_GREENMASK(v) == 0x07e0
 291             && GET_BLUEMASK(v)  == 0x001f
 292             && native_byte_order
 293             && v->BitsPerPixel == 16) {
 294       /* 5-6-5 RGB */
 295       return PIPE_FORMAT_R5G6B5_UNORM;
 296    }
 297
 298    assert(0);
 299    return 0;
 300 }
 301
 302
 303
 304 /**********************************************************************/
 305 /*****                Linked list of XMesaBuffers                 *****/
 306 /**********************************************************************/
 307
 308 XMesaBuffer XMesaBufferList = NULL;
 309
 310
 311 /**
 312  * Allocate a new XMesaBuffer object which corresponds to the given drawable.
 313  * Note that XMesaBuffer is derived from GLframebuffer.
 314  * The new XMesaBuffer will not have any size (Width=Height=0).
 315  *
 316  * \param d  the corresponding X drawable (window or pixmap)
 317  * \param type  either WINDOW, PIXMAP or PBUFFER, describing d
 318  * \param vis  the buffer's visual
 319  * \param cmap  the window's colormap, if known.
 320  * \return new XMesaBuffer or NULL if any problem
 321  */
 322 static XMesaBuffer
 323 create_xmesa_buffer(Drawable d, BufferType type,
 324                     XMesaVisual vis, Colormap cmap)
 325 {
 326    XMesaBuffer b;
 327    GLframebuffer *fb;
 328    enum pipe_format colorFormat, depthFormat, stencilFormat;
 329    uint width, height;
 330
 331    ASSERT(type == WINDOW || type == PIXMAP || type == PBUFFER);
 332
 333    b = (XMesaBuffer) CALLOC_STRUCT(xmesa_buffer);
 334    if (!b)
 335       return NULL;
 336
 337    b->drawable = d;
 338
 339    b->xm_visual = vis;
 340    b->type = type;
 341    b->cmap = cmap;
 342
 343    /* determine PIPE_FORMATs for buffers */
 344    colorFormat = choose_pixel_format(vis);
 345
 346    if (vis->mesa_visual.depthBits == 0)
 347       depthFormat = PIPE_FORMAT_NONE;
 348 #ifdef GALLIUM_CELL /* XXX temporary for Cell! */
 349    else
 350       depthFormat = PIPE_FORMAT_S8Z24_UNORM;
 351 #else
 352    else if (vis->mesa_visual.depthBits <= 16)
 353       depthFormat = PIPE_FORMAT_Z16_UNORM;
 354    else if (vis->mesa_visual.depthBits <= 24)
 355       depthFormat = PIPE_FORMAT_S8Z24_UNORM;
 356    else
 357       depthFormat = PIPE_FORMAT_Z32_UNORM;
 358 #endif
 359
 360    if (vis->mesa_visual.stencilBits == 8) {
 361       if (depthFormat == PIPE_FORMAT_S8Z24_UNORM)
 362          stencilFormat = depthFormat;
 363       else
 364          stencilFormat = PIPE_FORMAT_S8_UNORM;
 365    }
 366    else {
 367       /* no stencil */
 368       stencilFormat = PIPE_FORMAT_NONE;
 369       if (depthFormat == PIPE_FORMAT_S8Z24_UNORM) {
 370          /* use 24-bit Z, undefined stencil channel */
 371          depthFormat = PIPE_FORMAT_X8Z24_UNORM;
 372       }
 373    }
 374
 375
 376    get_drawable_size(vis->display, d, &width, &height);
 377
 378    /*
 379     * Create framebuffer, but we'll plug in our own renderbuffers below.
 380     */
 381    b->stfb = st_create_framebuffer(&vis->mesa_visual,
 382                                    colorFormat, depthFormat, stencilFormat,
 383                                    width, height,
 384                                    (void *) b);
 385    fb = &b->stfb->Base;
 386
 387    /*
 388     * Create scratch XImage for xmesa_display_surface()
 389     */
 390    b->tempImage = XCreateImage(vis->display,
 391                                vis->visinfo->visual,
 392                                vis->visinfo->depth,
 393                                ZPixmap, 0,   /* format, offset */
 394                                NULL,         /* data */
 395                                0, 0,         /* size */
 396                                32,           /* bitmap_pad */
 397                                0);           /* bytes_per_line */
 398
 399    /* GLX_EXT_texture_from_pixmap */
 400    b->TextureTarget = 0;
 401    b->TextureFormat = GLX_TEXTURE_FORMAT_NONE_EXT;
 402    b->TextureMipmap = 0;
 403
 404    /* insert buffer into linked list */
 405    b->Next = XMesaBufferList;
 406    XMesaBufferList = b;
 407
 408    return b;
 409 }
 410
 411
 412 /**
 413  * Find an XMesaBuffer by matching X display and colormap but NOT matching
 414  * the notThis buffer.
 415  */
 416 XMesaBuffer
 417 xmesa_find_buffer(Display *dpy, Colormap cmap, XMesaBuffer notThis)
 418 {
 419    XMesaBuffer b;
 420    for (b = XMesaBufferList; b; b = b->Next) {
 421       if (b->xm_visual->display == dpy &&
 422           b->cmap == cmap &&
 423           b != notThis) {
 424          return b;
 425       }
 426    }
 427    return NULL;
 428 }
 429
 430
 431 /**
 432  * Remove buffer from linked list, delete if no longer referenced.
 433  */
 434 static void
 435 xmesa_free_buffer(XMesaBuffer buffer)
 436 {
 437    XMesaBuffer prev = NULL, b;
 438
 439    for (b = XMesaBufferList; b; b = b->Next) {
 440       if (b == buffer) {
 441          struct gl_framebuffer *fb = &buffer->stfb->Base;
 442
 443          /* unlink buffer from list */
 444          if (prev)
 445             prev->Next = buffer->Next;
 446          else
 447             XMesaBufferList = buffer->Next;
 448
 449          /* mark as delete pending */
 450          fb->DeletePending = GL_TRUE;
 451
 452          /* Since the X window for the XMesaBuffer is going away, we don't
 453           * want to dereference this pointer in the future.
 454           */
 455          b->drawable = 0;
 456
 457          buffer->tempImage->data = NULL;
 458          XDestroyImage(buffer->tempImage);
 459
 460          /* Unreference.  If count = zero we'll really delete the buffer */
 461          _mesa_reference_framebuffer(&fb, NULL);
 462
 463          XFreeGC(b->xm_visual->display, b->gc);
 464
 465          free(buffer);
 466
 467          return;
 468       }
 469       /* continue search */
 470       prev = b;
 471    }
 472    /* buffer not found in XMesaBufferList */
 473    _mesa_problem(NULL,"xmesa_free_buffer() - buffer not found\n");
 474 }
 475
 476
 477
 478 /**********************************************************************/
 479 /*****                   Misc Private Functions                   *****/
 480 /**********************************************************************/
 481
 482
 483 /**
 484  * When a context is bound for the first time, we can finally finish
 485  * initializing the context's visual and buffer information.
 486  * \param v  the XMesaVisual to initialize
 487  * \param b  the XMesaBuffer to initialize (may be NULL)
 488  * \param rgb_flag  TRUE = RGBA mode, FALSE = color index mode
 489  * \param window  the window/pixmap we're rendering into
 490  * \param cmap  the colormap associated with the window/pixmap
 491  * \return GL_TRUE=success, GL_FALSE=failure
 492  */
 493 static GLboolean
 494 initialize_visual_and_buffer(XMesaVisual v, XMesaBuffer b,
 495                              GLboolean rgb_flag, Drawable window,
 496                              Colormap cmap)
 497 {
 498    ASSERT(!b || b->xm_visual == v);
 499
 500    /* Save true bits/pixel */
 501    v->BitsPerPixel = bits_per_pixel(v);
 502    assert(v->BitsPerPixel > 0);
 503
 504    if (rgb_flag == GL_FALSE) {
 505       /* COLOR-INDEXED WINDOW: not supported*/
 506       return GL_FALSE;
 507    }
 508    else {
 509       /* RGB WINDOW:
 510        * We support RGB rendering into almost any kind of visual.
 511        */
 512       const int xclass = v->mesa_visual.visualType;
 513       if (xclass != GLX_TRUE_COLOR && xclass == !GLX_DIRECT_COLOR) {
 514          _mesa_warning(NULL,
 515             "XMesa: RGB mode rendering not supported in given visual.\n");
 516          return GL_FALSE;
 517       }
 518       v->mesa_visual.indexBits = 0;
 519
 520       if (v->BitsPerPixel == 32) {
 521          /* We use XImages for all front/back buffers.  If an X Window or
 522           * X Pixmap is 32bpp, there's no guarantee that the alpha channel
 523           * will be preserved.  For XImages we're in luck.
 524           */
 525          v->mesa_visual.alphaBits = 8;
 526       }
 527    }
 528
 529    /*
 530     * If MESA_INFO env var is set print out some debugging info
 531     * which can help Brian figure out what's going on when a user
 532     * reports bugs.
 533     */
 534    if (_mesa_getenv("MESA_INFO")) {
 535       _mesa_printf("X/Mesa visual = %p\n", (void *) v);
 536       _mesa_printf("X/Mesa level = %d\n", v->mesa_visual.level);
 537       _mesa_printf("X/Mesa depth = %d\n", v->visinfo->depth);
 538       _mesa_printf("X/Mesa bits per pixel = %d\n", v->BitsPerPixel);
 539    }
 540
 541    if (b && window) {
 542       /* these should have been set in create_xmesa_buffer */
 543       ASSERT(b->drawable == window);
 544
 545       /* Setup for single/double buffering */
 546       if (v->mesa_visual.doubleBufferMode) {
 547          /* Double buffered */
 548          b->shm = xmesa_check_for_xshm( v->display );
 549       }
 550
 551       /* X11 graphics context */
 552       b->gc = XCreateGC( v->display, window, 0, NULL );
 553       XSetFunction( v->display, b->gc, GXcopy );
 554    }
 555
 556    return GL_TRUE;
 557 }
 558
 559
 560
 561 #define NUM_VISUAL_TYPES   6
 562
 563 /**
 564  * Convert an X visual type to a GLX visual type.
 565  *
 566  * \param visualType X visual type (i.e., \c TrueColor, \c StaticGray, etc.)
 567  *        to be converted.
 568  * \return If \c visualType is a valid X visual type, a GLX visual type will
 569  *         be returned.  Otherwise \c GLX_NONE will be returned.
 570  *
 571  * \note
 572  * This code was lifted directly from lib/GL/glx/glcontextmodes.c in the
 573  * DRI CVS tree.
 574  */
 575 static GLint
 576 xmesa_convert_from_x_visual_type( int visualType )
 577 {
 578     static const int glx_visual_types[ NUM_VISUAL_TYPES ] = {
 579         GLX_STATIC_GRAY,  GLX_GRAY_SCALE,
 580         GLX_STATIC_COLOR, GLX_PSEUDO_COLOR,
 581         GLX_TRUE_COLOR,   GLX_DIRECT_COLOR
 582     };
 583
 584     return ( (unsigned) visualType < NUM_VISUAL_TYPES )
 585         ? glx_visual_types[ visualType ] : GLX_NONE;
 586 }
 587
 588
 589 /**********************************************************************/
 590 /*****                       Public Functions                     *****/
 591 /**********************************************************************/
 592
 593
 594 /*
 595  * Create a new X/Mesa visual.
 596  * Input:  display - X11 display
 597  *         visinfo - an XVisualInfo pointer
 598  *         rgb_flag - GL_TRUE = RGB mode,
 599  *                    GL_FALSE = color index mode
 600  *         alpha_flag - alpha buffer requested?
 601  *         db_flag - GL_TRUE = double-buffered,
 602  *                   GL_FALSE = single buffered
 603  *         stereo_flag - stereo visual?
 604  *         ximage_flag - GL_TRUE = use an XImage for back buffer,
 605  *                       GL_FALSE = use an off-screen pixmap for back buffer
 606  *         depth_size - requested bits/depth values, or zero
 607  *         stencil_size - requested bits/stencil values, or zero
 608  *         accum_red_size - requested bits/red accum values, or zero
 609  *         accum_green_size - requested bits/green accum values, or zero
 610  *         accum_blue_size - requested bits/blue accum values, or zero
 611  *         accum_alpha_size - requested bits/alpha accum values, or zero
 612  *         num_samples - number of samples/pixel if multisampling, or zero
 613  *         level - visual level, usually 0
 614  *         visualCaveat - ala the GLX extension, usually GLX_NONE
 615  * Return;  a new XMesaVisual or 0 if error.
 616  */
 617 PUBLIC
 618 XMesaVisual XMesaCreateVisual( Display *display,
 619                                XVisualInfo * visinfo,
 620                                GLboolean rgb_flag,
 621                                GLboolean alpha_flag,
 622                                GLboolean db_flag,
 623                                GLboolean stereo_flag,
 624                                GLboolean ximage_flag,
 625                                GLint depth_size,
 626                                GLint stencil_size,
 627                                GLint accum_red_size,
 628                                GLint accum_green_size,
 629                                GLint accum_blue_size,
 630                                GLint accum_alpha_size,
 631                                GLint num_samples,
 632                                GLint level,
 633                                GLint visualCaveat )
 634 {
 635    XMesaVisual v;
 636    GLint red_bits, green_bits, blue_bits, alpha_bits;
 637
 638    /* For debugging only */
 639    if (_mesa_getenv("MESA_XSYNC")) {
 640       /* This makes debugging X easier.
 641        * In your debugger, set a breakpoint on _XError to stop when an
 642        * X protocol error is generated.
 643        */
 644       XSynchronize( display, 1 );
 645    }
 646
 647    v = (XMesaVisual) CALLOC_STRUCT(xmesa_visual);
 648    if (!v) {
 649       return NULL;
 650    }
 651
 652    v->display = display;
 653
 654    /* Save a copy of the XVisualInfo struct because the user may X_mesa_free()
 655     * the struct but we may need some of the information contained in it
 656     * at a later time.
 657     */
 658    v->visinfo = (XVisualInfo *) MALLOC(sizeof(*visinfo));
 659    if(!v->visinfo) {
 660       _mesa_free(v);
 661       return NULL;
 662    }
 663    MEMCPY(v->visinfo, visinfo, sizeof(*visinfo));
 664
 665    v->ximage_flag = ximage_flag;
 666
 667    v->mesa_visual.redMask = visinfo->red_mask;
 668    v->mesa_visual.greenMask = visinfo->green_mask;
 669    v->mesa_visual.blueMask = visinfo->blue_mask;
 670    v->mesa_visual.visualID = visinfo->visualid;
 671    v->mesa_visual.screen = visinfo->screen;
 672
 673 #if !(defined(__cplusplus) || defined(c_plusplus))
 674    v->mesa_visual.visualType = xmesa_convert_from_x_visual_type(visinfo->class);
 675 #else
 676    v->mesa_visual.visualType = xmesa_convert_from_x_visual_type(visinfo->c_class);
 677 #endif
 678
 679    v->mesa_visual.visualRating = visualCaveat;
 680
 681    if (alpha_flag)
 682       v->mesa_visual.alphaBits = 8;
 683
 684    (void) initialize_visual_and_buffer( v, NULL, rgb_flag, 0, 0 );
 685
 686    {
 687       const int xclass = v->mesa_visual.visualType;
 688       if (xclass == GLX_TRUE_COLOR || xclass == GLX_DIRECT_COLOR) {
 689          red_bits   = _mesa_bitcount(GET_REDMASK(v));
 690          green_bits = _mesa_bitcount(GET_GREENMASK(v));
 691          blue_bits  = _mesa_bitcount(GET_BLUEMASK(v));
 692       }
 693       else {
 694          /* this is an approximation */
 695          int depth;
 696          depth = v->visinfo->depth;
 697          red_bits = depth / 3;
 698          depth -= red_bits;
 699          green_bits = depth / 2;
 700          depth -= green_bits;
 701          blue_bits = depth;
 702          alpha_bits = 0;
 703          assert( red_bits + green_bits + blue_bits == v->visinfo->depth );
 704       }
 705       alpha_bits = v->mesa_visual.alphaBits;
 706    }
 707
 708    _mesa_initialize_visual( &v->mesa_visual,
 709                             rgb_flag, db_flag, stereo_flag,
 710                             red_bits, green_bits,
 711                             blue_bits, alpha_bits,
 712                             v->mesa_visual.indexBits,
 713                             depth_size,
 714                             stencil_size,
 715                             accum_red_size, accum_green_size,
 716                             accum_blue_size, accum_alpha_size,
 717                             0 );
 718
 719    /* XXX minor hack */
 720    v->mesa_visual.level = level;
 721    return v;
 722 }
 723
 724
 725 PUBLIC
 726 void XMesaDestroyVisual( XMesaVisual v )
 727 {
 728    _mesa_free(v->visinfo);
 729    _mesa_free(v);
 730 }
 731
 732
 733
 734 /**
 735  * Create a new XMesaContext.
 736  * \param v  the XMesaVisual
 737  * \param share_list  another XMesaContext with which to share display
 738  *                    lists or NULL if no sharing is wanted.
 739  * \return an XMesaContext or NULL if error.
 740  */
 741 PUBLIC
 742 XMesaContext XMesaCreateContext( XMesaVisual v, XMesaContext share_list )
 743 {
 744    static GLboolean firstTime = GL_TRUE;
 745    struct pipe_screen *screen;
 746    struct pipe_context *pipe;
 747    XMesaContext c;
 748    GLcontext *mesaCtx;
 749    uint pf;
 750
 751    if (firstTime) {
 752       pipe_mutex_init(_xmesa_lock);
 753       firstTime = GL_FALSE;
 754    }
 755
 756    /* Note: the XMesaContext contains a Mesa GLcontext struct (inheritance) */
 757    c = (XMesaContext) CALLOC_STRUCT(xmesa_context);
 758    if (!c)
 759       return NULL;
 760
 761    pf = choose_pixel_format(v);
 762    assert(pf);
 763
 764    c->xm_visual = v;
 765    c->xm_buffer = NULL;   /* set later by XMesaMakeCurrent */
 766
 767    /* XXX: create once per Xlib Display.
 768     */
 769    screen = driver.create_pipe_screen();
 770    if (screen == NULL)
 771       goto fail;
 772
 773    pipe = driver.create_pipe_context( screen,
 774                                      (void *)c );
 775    if (pipe == NULL)
 776       goto fail;
 777
 778    c->st = st_create_context(pipe,
 779                              &v->mesa_visual,
 780                              share_list ? share_list->st : NULL);
 781    if (c->st == NULL)
 782       goto fail;
 783
 784    mesaCtx = c->st->ctx;
 785    c->st->ctx->DriverCtx = c;
 786
 787 #if 00
 788    _mesa_enable_sw_extensions(mesaCtx);
 789    _mesa_enable_1_3_extensions(mesaCtx);
 790    _mesa_enable_1_4_extensions(mesaCtx);
 791    _mesa_enable_1_5_extensions(mesaCtx);
 792    _mesa_enable_2_0_extensions(mesaCtx);
 793 #endif
 794
 795    return c;
 796
 797  fail:
 798    if (c->st)
 799       st_destroy_context(c->st);
 800    else if (pipe)
 801       pipe->destroy(pipe);
 802
 803    if (screen)
 804       screen->destroy( screen );
 805
 806    FREE(c);
 807    return NULL;
 808 }
 809
 810
 811
 812 PUBLIC
 813 void XMesaDestroyContext( XMesaContext c )
 814 {
 815    st_destroy_context(c->st);
 816
 817    /* FIXME: We should destroy the screen here, but if we do so, surfaces may
 818     * outlive it, causing segfaults
 819    struct pipe_screen *screen = c->st->pipe->screen;
 820    screen->destroy(screen);
 821    */
 822
 823    _mesa_free(c);
 824 }
 825
 826
 827
 828 /**
 829  * Private function for creating an XMesaBuffer which corresponds to an
 830  * X window or pixmap.
 831  * \param v  the window's XMesaVisual
 832  * \param w  the window we're wrapping
 833  * \return  new XMesaBuffer or NULL if error
 834  */
 835 PUBLIC XMesaBuffer
 836 XMesaCreateWindowBuffer(XMesaVisual v, Window w)
 837 {
 838    XWindowAttributes attr;
 839    XMesaBuffer b;
 840    Colormap cmap;
 841    int depth;
 842
 843    assert(v);
 844    assert(w);
 845
 846    /* Check that window depth matches visual depth */
 847    XGetWindowAttributes( v->display, w, &attr );
 848    depth = attr.depth;
 849    if (v->visinfo->depth != depth) {
 850       _mesa_warning(NULL, "XMesaCreateWindowBuffer: depth mismatch between visual (%d) and window (%d)!\n",
 851                     v->visinfo->depth, depth);
 852       return NULL;
 853    }
 854
 855    /* Find colormap */
 856    if (attr.colormap) {
 857       cmap = attr.colormap;
 858    }
 859    else {
 860       _mesa_warning(NULL, "Window %u has no colormap!\n", (unsigned int) w);
 861       /* this is weird, a window w/out a colormap!? */
 862       /* OK, let's just allocate a new one and hope for the best */
 863       cmap = XCreateColormap(v->display, w, attr.visual, AllocNone);
 864    }
 865
 866    b = create_xmesa_buffer((Drawable) w, WINDOW, v, cmap);
 867    if (!b)
 868       return NULL;
 869
 870    if (!initialize_visual_and_buffer( v, b, v->mesa_visual.rgbMode,
 871                                       (Drawable) w, cmap )) {
 872       xmesa_free_buffer(b);
 873       return NULL;
 874    }
 875
 876    return b;
 877 }
 878
 879
 880
 881 /**
 882  * Create a new XMesaBuffer from an X pixmap.
 883  *
 884  * \param v    the XMesaVisual
 885  * \param p    the pixmap
 886  * \param cmap the colormap, may be 0 if using a \c GLX_TRUE_COLOR or
 887  *             \c GLX_DIRECT_COLOR visual for the pixmap
 888  * \returns new XMesaBuffer or NULL if error
 889  */
 890 PUBLIC XMesaBuffer
 891 XMesaCreatePixmapBuffer(XMesaVisual v, Pixmap p, Colormap cmap)
 892 {
 893    XMesaBuffer b;
 894
 895    assert(v);
 896
 897    b = create_xmesa_buffer((Drawable) p, PIXMAP, v, cmap);
 898    if (!b)
 899       return NULL;
 900
 901    if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
 902                                      (Drawable) p, cmap)) {
 903       xmesa_free_buffer(b);
 904       return NULL;
 905    }
 906
 907    return b;
 908 }
 909
 910
 911 /**
 912  * For GLX_EXT_texture_from_pixmap
 913  */
 914 XMesaBuffer
 915 XMesaCreatePixmapTextureBuffer(XMesaVisual v, Pixmap p,
 916                                Colormap cmap,
 917                                int format, int target, int mipmap)
 918 {
 919    GET_CURRENT_CONTEXT(ctx);
 920    XMesaBuffer b;
 921    GLuint width, height;
 922
 923    assert(v);
 924
 925    b = create_xmesa_buffer((Drawable) p, PIXMAP, v, cmap);
 926    if (!b)
 927       return NULL;
 928
 929    /* get pixmap size, update framebuffer/renderbuffer dims */
 930    xmesa_get_window_size(v->display, b, &width, &height);
 931    _mesa_resize_framebuffer(NULL, &(b->stfb->Base), width, height);
 932
 933    if (target == 0) {
 934       /* examine dims */
 935       if (ctx->Extensions.ARB_texture_non_power_of_two) {
 936          target = GLX_TEXTURE_2D_EXT;
 937       }
 938       else if (   _mesa_bitcount(width)  == 1
 939                && _mesa_bitcount(height) == 1) {
 940          /* power of two size */
 941          if (height == 1) {
 942             target = GLX_TEXTURE_1D_EXT;
 943          }
 944          else {
 945             target = GLX_TEXTURE_2D_EXT;
 946          }
 947       }
 948       else if (ctx->Extensions.NV_texture_rectangle) {
 949          target = GLX_TEXTURE_RECTANGLE_EXT;
 950       }
 951       else {
 952          /* non power of two textures not supported */
 953          XMesaDestroyBuffer(b);
 954          return 0;
 955       }
 956    }
 957
 958    b->TextureTarget = target;
 959    b->TextureFormat = format;
 960    b->TextureMipmap = mipmap;
 961
 962    if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
 963                                      (Drawable) p, cmap)) {
 964       xmesa_free_buffer(b);
 965       return NULL;
 966    }
 967
 968    return b;
 969 }
 970
 971
 972
 973 XMesaBuffer
 974 XMesaCreatePBuffer(XMesaVisual v, Colormap cmap,
 975                    unsigned int width, unsigned int height)
 976 {
 977    Window root;
 978    Drawable drawable;  /* X Pixmap Drawable */
 979    XMesaBuffer b;
 980
 981    /* allocate pixmap for front buffer */
 982    root = RootWindow( v->display, v->visinfo->screen );
 983    drawable = XCreatePixmap(v->display, root, width, height,
 984                             v->visinfo->depth);
 985    if (!drawable)
 986       return NULL;
 987
 988    b = create_xmesa_buffer(drawable, PBUFFER, v, cmap);
 989    if (!b)
 990       return NULL;
 991
 992    if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
 993                                      drawable, cmap)) {
 994       xmesa_free_buffer(b);
 995       return NULL;
 996    }
 997
 998    return b;
 999 }
1000
1001
1002
1003 /*
1004  * Deallocate an XMesaBuffer structure and all related info.
1005  */
1006 PUBLIC void
1007 XMesaDestroyBuffer(XMesaBuffer b)
1008 {
1009    xmesa_free_buffer(b);
1010 }
1011
1012
1013 /**
1014  * Query the current window size and update the corresponding GLframebuffer
1015  * and all attached renderbuffers.
1016  * Called when:
1017  *  1. the first time a buffer is bound to a context.
1018  *  2. SwapBuffers.  XXX probabaly from xm_flush_frontbuffer() too...
1019  * Note: it's possible (and legal) for xmctx to be NULL.  That can happen
1020  * when resizing a buffer when no rendering context is bound.
1021  */
1022 void
1023 xmesa_check_and_update_buffer_size(XMesaContext xmctx, XMesaBuffer drawBuffer)
1024 {
1025    GLuint width, height;
1026    xmesa_get_window_size(drawBuffer->xm_visual->display, drawBuffer, &width, &height);
1027    st_resize_framebuffer(drawBuffer->stfb, width, height);
1028 }
1029
1030
1031
1032
1033 /*
1034  * Bind buffer b to context c and make c the current rendering context.
1035  */
1036 PUBLIC
1037 GLboolean XMesaMakeCurrent2( XMesaContext c, XMesaBuffer drawBuffer,
1038                              XMesaBuffer readBuffer )
1039 {
1040    if (c) {
1041       if (!drawBuffer || !readBuffer)
1042          return GL_FALSE;  /* must specify buffers! */
1043
1044 #if 0
1045       /* XXX restore this optimization */
1046       if (&(c->mesa) == _mesa_get_current_context()
1047           && c->mesa.DrawBuffer == &drawBuffer->mesa_buffer
1048           && c->mesa.ReadBuffer == &readBuffer->mesa_buffer
1049           && xmesa_buffer(c->mesa.DrawBuffer)->wasCurrent) {
1050          /* same context and buffer, do nothing */
1051          return GL_TRUE;
1052       }
1053 #endif
1054
1055       c->xm_buffer = drawBuffer;
1056
1057       /* Call this periodically to detect when the user has begun using
1058        * GL rendering from multiple threads.
1059        */
1060       _glapi_check_multithread();
1061
1062       st_make_current(c->st, drawBuffer->stfb, readBuffer->stfb);
1063
1064       xmesa_check_and_update_buffer_size(c, drawBuffer);
1065       if (readBuffer != drawBuffer)
1066          xmesa_check_and_update_buffer_size(c, readBuffer);
1067
1068       /* Solution to Stephane Rehel's problem with glXReleaseBuffersMESA(): */
1069       drawBuffer->wasCurrent = GL_TRUE;
1070    }
1071    else {
1072       /* Detach */
1073       st_make_current( NULL, NULL, NULL );
1074    }
1075    return GL_TRUE;
1076 }
1077
1078
1079 /*
1080  * Unbind the context c from its buffer.
1081  */
1082 GLboolean XMesaUnbindContext( XMesaContext c )
1083 {
1084    /* A no-op for XFree86 integration purposes */
1085    return GL_TRUE;
1086 }
1087
1088
1089 XMesaContext XMesaGetCurrentContext( void )
1090 {
1091    GET_CURRENT_CONTEXT(ctx);
1092    if (ctx) {
1093       XMesaContext xmesa = xmesa_context(ctx);
1094       return xmesa;
1095    }
1096    else {
1097       return 0;
1098    }
1099 }
1100
1101
1102
1103
1104
1105
1106 /*
1107  * Copy the back buffer to the front buffer.  If there's no back buffer
1108  * this is a no-op.
1109  */
1110 PUBLIC
1111 void XMesaSwapBuffers( XMesaBuffer b )
1112 {
1113    struct pipe_surface *surf;
1114
1115    /* If we're swapping the buffer associated with the current context
1116     * we have to flush any pending rendering commands first.
1117     */
1118    st_notify_swapbuffers(b->stfb);
1119
1120    st_get_framebuffer_surface(b->stfb, ST_SURFACE_BACK_LEFT, &surf);
1121    if (surf) {
1122       driver.display_surface(b, surf);
1123    }
1124
1125    xmesa_check_and_update_buffer_size(NULL, b);
1126 }
1127
1128
1129
1130 /*
1131  * Copy sub-region of back buffer to front buffer
1132  */
1133 void XMesaCopySubBuffer( XMesaBuffer b, int x, int y, int width, int height )
1134 {
1135    struct pipe_surface *surf_front;
1136    struct pipe_surface *surf_back;
1137    struct pipe_context *pipe = NULL; /* XXX fix */
1138
1139    st_get_framebuffer_surface(b->stfb, ST_SURFACE_FRONT_LEFT, &surf_front);
1140    st_get_framebuffer_surface(b->stfb, ST_SURFACE_BACK_LEFT, &surf_back);
1141
1142    if (!surf_front || !surf_back)
1143       return;
1144
1145    pipe->surface_copy(pipe,
1146                       surf_front, x, y,  /* dest */
1147                       surf_back, x, y,   /* src */
1148                       width, height);
1149 }
1150
1151
1152
1153 void XMesaFlush( XMesaContext c )
1154 {
1155    if (c && c->xm_visual->display) {
1156       st_finish(c->st);
1157       XSync( c->xm_visual->display, False );
1158    }
1159 }
1160
1161
1162
1163
1164
1165 XMesaBuffer XMesaFindBuffer( Display *dpy, Drawable d )
1166 {
1167    XMesaBuffer b;
1168    for (b=XMesaBufferList; b; b=b->Next) {
1169       if (b->drawable == d && b->xm_visual->display == dpy) {
1170          return b;
1171       }
1172    }
1173    return NULL;
1174 }
1175
1176
1177 /**
1178  * Free/destroy all XMesaBuffers associated with given display.
1179  */
1180 void xmesa_destroy_buffers_on_display(Display *dpy)
1181 {
1182    XMesaBuffer b, next;
1183    for (b = XMesaBufferList; b; b = next) {
1184       next = b->Next;
1185       if (b->xm_visual->display == dpy) {
1186          xmesa_free_buffer(b);
1187       }
1188    }
1189 }
1190
1191
1192 /*
1193  * Look for XMesaBuffers whose X window has been destroyed.
1194  * Deallocate any such XMesaBuffers.
1195  */
1196 void XMesaGarbageCollect( void )
1197 {
1198    XMesaBuffer b, next;
1199    for (b=XMesaBufferList; b; b=next) {
1200       next = b->Next;
1201       if (b->xm_visual &&
1202           b->xm_visual->display &&
1203           b->drawable &&
1204           b->type == WINDOW) {
1205          XSync(b->xm_visual->display, False);
1206          if (!window_exists( b->xm_visual->display, b->drawable )) {
1207             /* found a dead window, free the ancillary info */
1208             XMesaDestroyBuffer( b );
1209          }
1210       }
1211    }
1212 }
1213
1214
1215
1216
1217 PUBLIC void
1218 XMesaBindTexImage(Display *dpy, XMesaBuffer drawable, int buffer,
1219                   const int *attrib_list)
1220 {
1221 }
1222
1223
1224
1225 PUBLIC void
1226 XMesaReleaseTexImage(Display *dpy, XMesaBuffer drawable, int buffer)
1227 {
1228 }
1229