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)   == 0x0000ff00
 290             && GET_GREENMASK(v) == 0x00ff0000
 291             && GET_BLUEMASK(v)  == 0xff000000
 292             && v->BitsPerPixel == 32) {
 293       if (native_byte_order) {
 294          /* no byteswapping needed */
 295          return PIPE_FORMAT_B8G8R8A8_UNORM;
 296       }
 297       else {
 298          return PIPE_FORMAT_A8R8G8B8_UNORM;
 299       }
 300    }
 301    else if (   GET_REDMASK(v)   == 0xf800
 302             && GET_GREENMASK(v) == 0x07e0
 303             && GET_BLUEMASK(v)  == 0x001f
 304             && native_byte_order
 305             && v->BitsPerPixel == 16) {
 306       /* 5-6-5 RGB */
 307       return PIPE_FORMAT_R5G6B5_UNORM;
 308    }
 309
 310    assert(0);
 311    return 0;
 312 }
 313
 314
 315
 316 /**********************************************************************/
 317 /*****                Linked list of XMesaBuffers                 *****/
 318 /**********************************************************************/
 319
 320 XMesaBuffer XMesaBufferList = NULL;
 321
 322
 323 /**
 324  * Allocate a new XMesaBuffer object which corresponds to the given drawable.
 325  * Note that XMesaBuffer is derived from GLframebuffer.
 326  * The new XMesaBuffer will not have any size (Width=Height=0).
 327  *
 328  * \param d  the corresponding X drawable (window or pixmap)
 329  * \param type  either WINDOW, PIXMAP or PBUFFER, describing d
 330  * \param vis  the buffer's visual
 331  * \param cmap  the window's colormap, if known.
 332  * \return new XMesaBuffer or NULL if any problem
 333  */
 334 static XMesaBuffer
 335 create_xmesa_buffer(Drawable d, BufferType type,
 336                     XMesaVisual vis, Colormap cmap)
 337 {
 338    XMesaBuffer b;
 339    GLframebuffer *fb;
 340    enum pipe_format colorFormat, depthFormat, stencilFormat;
 341    uint width, height;
 342
 343    ASSERT(type == WINDOW || type == PIXMAP || type == PBUFFER);
 344
 345    b = (XMesaBuffer) CALLOC_STRUCT(xmesa_buffer);
 346    if (!b)
 347       return NULL;
 348
 349    b->drawable = d;
 350
 351    b->xm_visual = vis;
 352    b->type = type;
 353    b->cmap = cmap;
 354
 355    /* determine PIPE_FORMATs for buffers */
 356    colorFormat = choose_pixel_format(vis);
 357
 358    if (vis->mesa_visual.depthBits == 0)
 359       depthFormat = PIPE_FORMAT_NONE;
 360 #ifdef GALLIUM_CELL /* XXX temporary for Cell! */
 361    else
 362       depthFormat = PIPE_FORMAT_S8Z24_UNORM;
 363 #else
 364    else if (vis->mesa_visual.depthBits <= 16)
 365       depthFormat = PIPE_FORMAT_Z16_UNORM;
 366    else if (vis->mesa_visual.depthBits <= 24)
 367       depthFormat = PIPE_FORMAT_S8Z24_UNORM;
 368    else
 369       depthFormat = PIPE_FORMAT_Z32_UNORM;
 370 #endif
 371
 372    if (vis->mesa_visual.stencilBits == 8) {
 373       if (depthFormat == PIPE_FORMAT_S8Z24_UNORM)
 374          stencilFormat = depthFormat;
 375       else
 376          stencilFormat = PIPE_FORMAT_S8_UNORM;
 377    }
 378    else {
 379       /* no stencil */
 380       stencilFormat = PIPE_FORMAT_NONE;
 381       if (depthFormat == PIPE_FORMAT_S8Z24_UNORM) {
 382          /* use 24-bit Z, undefined stencil channel */
 383          depthFormat = PIPE_FORMAT_X8Z24_UNORM;
 384       }
 385    }
 386
 387
 388    get_drawable_size(vis->display, d, &width, &height);
 389
 390    /*
 391     * Create framebuffer, but we'll plug in our own renderbuffers below.
 392     */
 393    b->stfb = st_create_framebuffer(&vis->mesa_visual,
 394                                    colorFormat, depthFormat, stencilFormat,
 395                                    width, height,
 396                                    (void *) b);
 397    fb = &b->stfb->Base;
 398
 399    /*
 400     * Create scratch XImage for xmesa_display_surface()
 401     */
 402    b->tempImage = XCreateImage(vis->display,
 403                                vis->visinfo->visual,
 404                                vis->visinfo->depth,
 405                                ZPixmap, 0,   /* format, offset */
 406                                NULL,         /* data */
 407                                0, 0,         /* size */
 408                                32,           /* bitmap_pad */
 409                                0);           /* bytes_per_line */
 410
 411    /* GLX_EXT_texture_from_pixmap */
 412    b->TextureTarget = 0;
 413    b->TextureFormat = GLX_TEXTURE_FORMAT_NONE_EXT;
 414    b->TextureMipmap = 0;
 415
 416    /* insert buffer into linked list */
 417    b->Next = XMesaBufferList;
 418    XMesaBufferList = b;
 419
 420    return b;
 421 }
 422
 423
 424 /**
 425  * Find an XMesaBuffer by matching X display and colormap but NOT matching
 426  * the notThis buffer.
 427  */
 428 XMesaBuffer
 429 xmesa_find_buffer(Display *dpy, Colormap cmap, XMesaBuffer notThis)
 430 {
 431    XMesaBuffer b;
 432    for (b = XMesaBufferList; b; b = b->Next) {
 433       if (b->xm_visual->display == dpy &&
 434           b->cmap == cmap &&
 435           b != notThis) {
 436          return b;
 437       }
 438    }
 439    return NULL;
 440 }
 441
 442
 443 /**
 444  * Remove buffer from linked list, delete if no longer referenced.
 445  */
 446 static void
 447 xmesa_free_buffer(XMesaBuffer buffer)
 448 {
 449    XMesaBuffer prev = NULL, b;
 450
 451    for (b = XMesaBufferList; b; b = b->Next) {
 452       if (b == buffer) {
 453          struct gl_framebuffer *fb = &buffer->stfb->Base;
 454
 455          /* unlink buffer from list */
 456          if (prev)
 457             prev->Next = buffer->Next;
 458          else
 459             XMesaBufferList = buffer->Next;
 460
 461          /* mark as delete pending */
 462          fb->DeletePending = GL_TRUE;
 463
 464          /* Since the X window for the XMesaBuffer is going away, we don't
 465           * want to dereference this pointer in the future.
 466           */
 467          b->drawable = 0;
 468
 469          buffer->tempImage->data = NULL;
 470          XDestroyImage(buffer->tempImage);
 471
 472          /* Unreference.  If count = zero we'll really delete the buffer */
 473          _mesa_reference_framebuffer(&fb, NULL);
 474
 475          XFreeGC(b->xm_visual->display, b->gc);
 476
 477          free(buffer);
 478
 479          return;
 480       }
 481       /* continue search */
 482       prev = b;
 483    }
 484    /* buffer not found in XMesaBufferList */
 485    _mesa_problem(NULL,"xmesa_free_buffer() - buffer not found\n");
 486 }
 487
 488
 489
 490 /**********************************************************************/
 491 /*****                   Misc Private Functions                   *****/
 492 /**********************************************************************/
 493
 494
 495 /**
 496  * When a context is bound for the first time, we can finally finish
 497  * initializing the context's visual and buffer information.
 498  * \param v  the XMesaVisual to initialize
 499  * \param b  the XMesaBuffer to initialize (may be NULL)
 500  * \param rgb_flag  TRUE = RGBA mode, FALSE = color index mode
 501  * \param window  the window/pixmap we're rendering into
 502  * \param cmap  the colormap associated with the window/pixmap
 503  * \return GL_TRUE=success, GL_FALSE=failure
 504  */
 505 static GLboolean
 506 initialize_visual_and_buffer(XMesaVisual v, XMesaBuffer b,
 507                              GLboolean rgb_flag, Drawable window,
 508                              Colormap cmap)
 509 {
 510    ASSERT(!b || b->xm_visual == v);
 511
 512    /* Save true bits/pixel */
 513    v->BitsPerPixel = bits_per_pixel(v);
 514    assert(v->BitsPerPixel > 0);
 515
 516    if (rgb_flag == GL_FALSE) {
 517       /* COLOR-INDEXED WINDOW: not supported*/
 518       return GL_FALSE;
 519    }
 520    else {
 521       /* RGB WINDOW:
 522        * We support RGB rendering into almost any kind of visual.
 523        */
 524       const int xclass = v->mesa_visual.visualType;
 525       if (xclass != GLX_TRUE_COLOR && xclass == !GLX_DIRECT_COLOR) {
 526          _mesa_warning(NULL,
 527             "XMesa: RGB mode rendering not supported in given visual.\n");
 528          return GL_FALSE;
 529       }
 530       v->mesa_visual.indexBits = 0;
 531
 532       if (v->BitsPerPixel == 32) {
 533          /* We use XImages for all front/back buffers.  If an X Window or
 534           * X Pixmap is 32bpp, there's no guarantee that the alpha channel
 535           * will be preserved.  For XImages we're in luck.
 536           */
 537          v->mesa_visual.alphaBits = 8;
 538       }
 539    }
 540
 541    /*
 542     * If MESA_INFO env var is set print out some debugging info
 543     * which can help Brian figure out what's going on when a user
 544     * reports bugs.
 545     */
 546    if (_mesa_getenv("MESA_INFO")) {
 547       _mesa_printf("X/Mesa visual = %p\n", (void *) v);
 548       _mesa_printf("X/Mesa level = %d\n", v->mesa_visual.level);
 549       _mesa_printf("X/Mesa depth = %d\n", v->visinfo->depth);
 550       _mesa_printf("X/Mesa bits per pixel = %d\n", v->BitsPerPixel);
 551    }
 552
 553    if (b && window) {
 554       /* these should have been set in create_xmesa_buffer */
 555       ASSERT(b->drawable == window);
 556
 557       /* Setup for single/double buffering */
 558       if (v->mesa_visual.doubleBufferMode) {
 559          /* Double buffered */
 560          b->shm = xmesa_check_for_xshm( v->display );
 561       }
 562
 563       /* X11 graphics context */
 564       b->gc = XCreateGC( v->display, window, 0, NULL );
 565       XSetFunction( v->display, b->gc, GXcopy );
 566    }
 567
 568    return GL_TRUE;
 569 }
 570
 571
 572
 573 #define NUM_VISUAL_TYPES   6
 574
 575 /**
 576  * Convert an X visual type to a GLX visual type.
 577  *
 578  * \param visualType X visual type (i.e., \c TrueColor, \c StaticGray, etc.)
 579  *        to be converted.
 580  * \return If \c visualType is a valid X visual type, a GLX visual type will
 581  *         be returned.  Otherwise \c GLX_NONE will be returned.
 582  *
 583  * \note
 584  * This code was lifted directly from lib/GL/glx/glcontextmodes.c in the
 585  * DRI CVS tree.
 586  */
 587 static GLint
 588 xmesa_convert_from_x_visual_type( int visualType )
 589 {
 590     static const int glx_visual_types[ NUM_VISUAL_TYPES ] = {
 591         GLX_STATIC_GRAY,  GLX_GRAY_SCALE,
 592         GLX_STATIC_COLOR, GLX_PSEUDO_COLOR,
 593         GLX_TRUE_COLOR,   GLX_DIRECT_COLOR
 594     };
 595
 596     return ( (unsigned) visualType < NUM_VISUAL_TYPES )
 597         ? glx_visual_types[ visualType ] : GLX_NONE;
 598 }
 599
 600
 601 /**********************************************************************/
 602 /*****                       Public Functions                     *****/
 603 /**********************************************************************/
 604
 605
 606 /*
 607  * Create a new X/Mesa visual.
 608  * Input:  display - X11 display
 609  *         visinfo - an XVisualInfo pointer
 610  *         rgb_flag - GL_TRUE = RGB mode,
 611  *                    GL_FALSE = color index mode
 612  *         alpha_flag - alpha buffer requested?
 613  *         db_flag - GL_TRUE = double-buffered,
 614  *                   GL_FALSE = single buffered
 615  *         stereo_flag - stereo visual?
 616  *         ximage_flag - GL_TRUE = use an XImage for back buffer,
 617  *                       GL_FALSE = use an off-screen pixmap for back buffer
 618  *         depth_size - requested bits/depth values, or zero
 619  *         stencil_size - requested bits/stencil values, or zero
 620  *         accum_red_size - requested bits/red accum values, or zero
 621  *         accum_green_size - requested bits/green accum values, or zero
 622  *         accum_blue_size - requested bits/blue accum values, or zero
 623  *         accum_alpha_size - requested bits/alpha accum values, or zero
 624  *         num_samples - number of samples/pixel if multisampling, or zero
 625  *         level - visual level, usually 0
 626  *         visualCaveat - ala the GLX extension, usually GLX_NONE
 627  * Return;  a new XMesaVisual or 0 if error.
 628  */
 629 PUBLIC
 630 XMesaVisual XMesaCreateVisual( Display *display,
 631                                XVisualInfo * visinfo,
 632                                GLboolean rgb_flag,
 633                                GLboolean alpha_flag,
 634                                GLboolean db_flag,
 635                                GLboolean stereo_flag,
 636                                GLboolean ximage_flag,
 637                                GLint depth_size,
 638                                GLint stencil_size,
 639                                GLint accum_red_size,
 640                                GLint accum_green_size,
 641                                GLint accum_blue_size,
 642                                GLint accum_alpha_size,
 643                                GLint num_samples,
 644                                GLint level,
 645                                GLint visualCaveat )
 646 {
 647    XMesaVisual v;
 648    GLint red_bits, green_bits, blue_bits, alpha_bits;
 649
 650    /* For debugging only */
 651    if (_mesa_getenv("MESA_XSYNC")) {
 652       /* This makes debugging X easier.
 653        * In your debugger, set a breakpoint on _XError to stop when an
 654        * X protocol error is generated.
 655        */
 656       XSynchronize( display, 1 );
 657    }
 658
 659    v = (XMesaVisual) CALLOC_STRUCT(xmesa_visual);
 660    if (!v) {
 661       return NULL;
 662    }
 663
 664    v->display = display;
 665
 666    /* Save a copy of the XVisualInfo struct because the user may X_mesa_free()
 667     * the struct but we may need some of the information contained in it
 668     * at a later time.
 669     */
 670    v->visinfo = (XVisualInfo *) MALLOC(sizeof(*visinfo));
 671    if (!v->visinfo) {
 672       _mesa_free(v);
 673       return NULL;
 674    }
 675    MEMCPY(v->visinfo, visinfo, sizeof(*visinfo));
 676
 677    v->ximage_flag = ximage_flag;
 678
 679    v->mesa_visual.redMask = visinfo->red_mask;
 680    v->mesa_visual.greenMask = visinfo->green_mask;
 681    v->mesa_visual.blueMask = visinfo->blue_mask;
 682    v->mesa_visual.visualID = visinfo->visualid;
 683    v->mesa_visual.screen = visinfo->screen;
 684
 685 #if !(defined(__cplusplus) || defined(c_plusplus))
 686    v->mesa_visual.visualType = xmesa_convert_from_x_visual_type(visinfo->class);
 687 #else
 688    v->mesa_visual.visualType = xmesa_convert_from_x_visual_type(visinfo->c_class);
 689 #endif
 690
 691    v->mesa_visual.visualRating = visualCaveat;
 692
 693    if (alpha_flag)
 694       v->mesa_visual.alphaBits = 8;
 695
 696    (void) initialize_visual_and_buffer( v, NULL, rgb_flag, 0, 0 );
 697
 698    {
 699       const int xclass = v->mesa_visual.visualType;
 700       if (xclass == GLX_TRUE_COLOR || xclass == GLX_DIRECT_COLOR) {
 701          red_bits   = _mesa_bitcount(GET_REDMASK(v));
 702          green_bits = _mesa_bitcount(GET_GREENMASK(v));
 703          blue_bits  = _mesa_bitcount(GET_BLUEMASK(v));
 704       }
 705       else {
 706          /* this is an approximation */
 707          int depth;
 708          depth = v->visinfo->depth;
 709          red_bits = depth / 3;
 710          depth -= red_bits;
 711          green_bits = depth / 2;
 712          depth -= green_bits;
 713          blue_bits = depth;
 714          alpha_bits = 0;
 715          assert( red_bits + green_bits + blue_bits == v->visinfo->depth );
 716       }
 717       alpha_bits = v->mesa_visual.alphaBits;
 718    }
 719
 720    _mesa_initialize_visual( &v->mesa_visual,
 721                             rgb_flag, db_flag, stereo_flag,
 722                             red_bits, green_bits,
 723                             blue_bits, alpha_bits,
 724                             v->mesa_visual.indexBits,
 725                             depth_size,
 726                             stencil_size,
 727                             accum_red_size, accum_green_size,
 728                             accum_blue_size, accum_alpha_size,
 729                             0 );
 730
 731    /* XXX minor hack */
 732    v->mesa_visual.level = level;
 733    return v;
 734 }
 735
 736
 737 PUBLIC
 738 void XMesaDestroyVisual( XMesaVisual v )
 739 {
 740    _mesa_free(v->visinfo);
 741    _mesa_free(v);
 742 }
 743
 744
 745
 746 /**
 747  * Create a new XMesaContext.
 748  * \param v  the XMesaVisual
 749  * \param share_list  another XMesaContext with which to share display
 750  *                    lists or NULL if no sharing is wanted.
 751  * \return an XMesaContext or NULL if error.
 752  */
 753 PUBLIC
 754 XMesaContext XMesaCreateContext( XMesaVisual v, XMesaContext share_list )
 755 {
 756    static GLboolean firstTime = GL_TRUE;
 757    static struct pipe_screen *screen = NULL;
 758    struct pipe_context *pipe = NULL;
 759    XMesaContext c;
 760    GLcontext *mesaCtx;
 761    uint pf;
 762
 763    if (firstTime) {
 764       pipe_mutex_init(_xmesa_lock);
 765       screen = driver.create_pipe_screen();
 766       firstTime = GL_FALSE;
 767    }
 768
 769    /* Note: the XMesaContext contains a Mesa GLcontext struct (inheritance) */
 770    c = (XMesaContext) CALLOC_STRUCT(xmesa_context);
 771    if (!c)
 772       return NULL;
 773
 774    pf = choose_pixel_format(v);
 775    assert(pf);
 776
 777    c->xm_visual = v;
 778    c->xm_buffer = NULL;   /* set later by XMesaMakeCurrent */
 779    c->xm_read_buffer = NULL;
 780
 781    if (screen == NULL)
 782       goto fail;
 783
 784    pipe = driver.create_pipe_context(screen, (void *) c);
 785    if (pipe == NULL)
 786       goto fail;
 787
 788    c->st = st_create_context(pipe,
 789                              &v->mesa_visual,
 790                              share_list ? share_list->st : NULL);
 791    if (c->st == NULL)
 792       goto fail;
 793
 794    mesaCtx = c->st->ctx;
 795    c->st->ctx->DriverCtx = c;
 796
 797    return c;
 798
 799 fail:
 800    if (c->st)
 801       st_destroy_context(c->st);
 802    else if (pipe)
 803       pipe->destroy(pipe);
 804
 805    _mesa_free(c);
 806    return NULL;
 807 }
 808
 809
 810
 811 PUBLIC
 812 void XMesaDestroyContext( XMesaContext c )
 813 {
 814    st_destroy_context(c->st);
 815
 816    /* FIXME: We should destroy the screen here, but if we do so, surfaces may
 817     * outlive it, causing segfaults
 818    struct pipe_screen *screen = c->st->pipe->screen;
 819    screen->destroy(screen);
 820    */
 821
 822    _mesa_free(c);
 823 }
 824
 825
 826
 827 /**
 828  * Private function for creating an XMesaBuffer which corresponds to an
 829  * X window or pixmap.
 830  * \param v  the window's XMesaVisual
 831  * \param w  the window we're wrapping
 832  * \return  new XMesaBuffer or NULL if error
 833  */
 834 PUBLIC XMesaBuffer
 835 XMesaCreateWindowBuffer(XMesaVisual v, Window w)
 836 {
 837    XWindowAttributes attr;
 838    XMesaBuffer b;
 839    Colormap cmap;
 840    int depth;
 841
 842    assert(v);
 843    assert(w);
 844
 845    /* Check that window depth matches visual depth */
 846    XGetWindowAttributes( v->display, w, &attr );
 847    depth = attr.depth;
 848    if (v->visinfo->depth != depth) {
 849       _mesa_warning(NULL, "XMesaCreateWindowBuffer: depth mismatch between visual (%d) and window (%d)!\n",
 850                     v->visinfo->depth, depth);
 851       return NULL;
 852    }
 853
 854    /* Find colormap */
 855    if (attr.colormap) {
 856       cmap = attr.colormap;
 857    }
 858    else {
 859       _mesa_warning(NULL, "Window %u has no colormap!\n", (unsigned int) w);
 860       /* this is weird, a window w/out a colormap!? */
 861       /* OK, let's just allocate a new one and hope for the best */
 862       cmap = XCreateColormap(v->display, w, attr.visual, AllocNone);
 863    }
 864
 865    b = create_xmesa_buffer((Drawable) w, WINDOW, v, cmap);
 866    if (!b)
 867       return NULL;
 868
 869    if (!initialize_visual_and_buffer( v, b, v->mesa_visual.rgbMode,
 870                                       (Drawable) w, cmap )) {
 871       xmesa_free_buffer(b);
 872       return NULL;
 873    }
 874
 875    return b;
 876 }
 877
 878
 879
 880 /**
 881  * Create a new XMesaBuffer from an X pixmap.
 882  *
 883  * \param v    the XMesaVisual
 884  * \param p    the pixmap
 885  * \param cmap the colormap, may be 0 if using a \c GLX_TRUE_COLOR or
 886  *             \c GLX_DIRECT_COLOR visual for the pixmap
 887  * \returns new XMesaBuffer or NULL if error
 888  */
 889 PUBLIC XMesaBuffer
 890 XMesaCreatePixmapBuffer(XMesaVisual v, Pixmap p, Colormap cmap)
 891 {
 892    XMesaBuffer b;
 893
 894    assert(v);
 895
 896    b = create_xmesa_buffer((Drawable) p, PIXMAP, v, cmap);
 897    if (!b)
 898       return NULL;
 899
 900    if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
 901                                      (Drawable) p, cmap)) {
 902       xmesa_free_buffer(b);
 903       return NULL;
 904    }
 905
 906    return b;
 907 }
 908
 909
 910 /**
 911  * For GLX_EXT_texture_from_pixmap
 912  */
 913 XMesaBuffer
 914 XMesaCreatePixmapTextureBuffer(XMesaVisual v, Pixmap p,
 915                                Colormap cmap,
 916                                int format, int target, int mipmap)
 917 {
 918    GET_CURRENT_CONTEXT(ctx);
 919    XMesaBuffer b;
 920    GLuint width, height;
 921
 922    assert(v);
 923
 924    b = create_xmesa_buffer((Drawable) p, PIXMAP, v, cmap);
 925    if (!b)
 926       return NULL;
 927
 928    /* get pixmap size, update framebuffer/renderbuffer dims */
 929    xmesa_get_window_size(v->display, b, &width, &height);
 930    _mesa_resize_framebuffer(NULL, &(b->stfb->Base), width, height);
 931
 932    if (target == 0) {
 933       /* examine dims */
 934       if (ctx->Extensions.ARB_texture_non_power_of_two) {
 935          target = GLX_TEXTURE_2D_EXT;
 936       }
 937       else if (   _mesa_bitcount(width)  == 1
 938                && _mesa_bitcount(height) == 1) {
 939          /* power of two size */
 940          if (height == 1) {
 941             target = GLX_TEXTURE_1D_EXT;
 942          }
 943          else {
 944             target = GLX_TEXTURE_2D_EXT;
 945          }
 946       }
 947       else if (ctx->Extensions.NV_texture_rectangle) {
 948          target = GLX_TEXTURE_RECTANGLE_EXT;
 949       }
 950       else {
 951          /* non power of two textures not supported */
 952          XMesaDestroyBuffer(b);
 953          return 0;
 954       }
 955    }
 956
 957    b->TextureTarget = target;
 958    b->TextureFormat = format;
 959    b->TextureMipmap = mipmap;
 960
 961    if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
 962                                      (Drawable) p, cmap)) {
 963       xmesa_free_buffer(b);
 964       return NULL;
 965    }
 966
 967    return b;
 968 }
 969
 970
 971
 972 XMesaBuffer
 973 XMesaCreatePBuffer(XMesaVisual v, Colormap cmap,
 974                    unsigned int width, unsigned int height)
 975 {
 976    Window root;
 977    Drawable drawable;  /* X Pixmap Drawable */
 978    XMesaBuffer b;
 979
 980    /* allocate pixmap for front buffer */
 981    root = RootWindow( v->display, v->visinfo->screen );
 982    drawable = XCreatePixmap(v->display, root, width, height,
 983                             v->visinfo->depth);
 984    if (!drawable)
 985       return NULL;
 986
 987    b = create_xmesa_buffer(drawable, PBUFFER, v, cmap);
 988    if (!b)
 989       return NULL;
 990
 991    if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
 992                                      drawable, cmap)) {
 993       xmesa_free_buffer(b);
 994       return NULL;
 995    }
 996
 997    return b;
 998 }
 999
1000
1001
1002 /*
1003  * Deallocate an XMesaBuffer structure and all related info.
1004  */
1005 PUBLIC void
1006 XMesaDestroyBuffer(XMesaBuffer b)
1007 {
1008    xmesa_free_buffer(b);
1009 }
1010
1011
1012 /**
1013  * Query the current window size and update the corresponding GLframebuffer
1014  * and all attached renderbuffers.
1015  * Called when:
1016  *  1. the first time a buffer is bound to a context.
1017  *  2. SwapBuffers.  XXX probabaly from xm_flush_frontbuffer() too...
1018  * Note: it's possible (and legal) for xmctx to be NULL.  That can happen
1019  * when resizing a buffer when no rendering context is bound.
1020  */
1021 void
1022 xmesa_check_and_update_buffer_size(XMesaContext xmctx, XMesaBuffer drawBuffer)
1023 {
1024    GLuint width, height;
1025    xmesa_get_window_size(drawBuffer->xm_visual->display, drawBuffer, &width, &height);
1026    st_resize_framebuffer(drawBuffer->stfb, width, height);
1027 }
1028
1029
1030
1031
1032 /*
1033  * Bind buffer b to context c and make c the current rendering context.
1034  */
1035 PUBLIC
1036 GLboolean XMesaMakeCurrent2( XMesaContext c, XMesaBuffer drawBuffer,
1037                              XMesaBuffer readBuffer )
1038 {
1039    XMesaContext old_ctx = XMesaGetCurrentContext();
1040
1041    if (old_ctx && old_ctx != c) {
1042       XMesaFlush(old_ctx);
1043       old_ctx->xm_buffer = NULL;
1044       old_ctx->xm_read_buffer = NULL;
1045    }
1046
1047    if (c) {
1048       if (!drawBuffer || !readBuffer)
1049          return GL_FALSE;  /* must specify buffers! */
1050
1051       if (c == old_ctx &&
1052           c->xm_buffer == drawBuffer &&
1053           c->xm_read_buffer == readBuffer)
1054          return GL_TRUE;
1055
1056       c->xm_buffer = drawBuffer;
1057       c->xm_read_buffer = readBuffer;
1058
1059       st_make_current(c->st, drawBuffer->stfb, readBuffer->stfb);
1060
1061       xmesa_check_and_update_buffer_size(c, drawBuffer);
1062       if (readBuffer != drawBuffer)
1063          xmesa_check_and_update_buffer_size(c, readBuffer);
1064
1065       /* Solution to Stephane Rehel's problem with glXReleaseBuffersMESA(): */
1066       drawBuffer->wasCurrent = GL_TRUE;
1067    }
1068    else {
1069       /* Detach */
1070       st_make_current( NULL, NULL, NULL );
1071
1072    }
1073    return GL_TRUE;
1074 }
1075
1076
1077 /*
1078  * Unbind the context c from its buffer.
1079  */
1080 GLboolean XMesaUnbindContext( XMesaContext c )
1081 {
1082    /* A no-op for XFree86 integration purposes */
1083    return GL_TRUE;
1084 }
1085
1086
1087 XMesaContext XMesaGetCurrentContext( void )
1088 {
1089    GET_CURRENT_CONTEXT(ctx);
1090    if (ctx) {
1091       XMesaContext xmesa = xmesa_context(ctx);
1092       return xmesa;
1093    }
1094    else {
1095       return 0;
1096    }
1097 }
1098
1099
1100
1101 /**
1102  * Swap front and back color buffers and have winsys display front buffer.
1103  * If there's no front color buffer no swap actually occurs.
1104  */
1105 PUBLIC
1106 void XMesaSwapBuffers( XMesaBuffer b )
1107 {
1108    struct pipe_surface *frontLeftSurf;
1109
1110    st_swapbuffers(b->stfb, &frontLeftSurf, NULL);
1111
1112    if (frontLeftSurf) {
1113       driver.display_surface(b, frontLeftSurf);
1114    }
1115
1116    xmesa_check_and_update_buffer_size(NULL, b);
1117 }
1118
1119
1120
1121 /*
1122  * Copy sub-region of back buffer to front buffer
1123  */
1124 void XMesaCopySubBuffer( XMesaBuffer b, int x, int y, int width, int height )
1125 {
1126    struct pipe_surface *surf_front;
1127    struct pipe_surface *surf_back;
1128    struct pipe_context *pipe = NULL; /* XXX fix */
1129
1130    st_get_framebuffer_surface(b->stfb, ST_SURFACE_FRONT_LEFT, &surf_front);
1131    st_get_framebuffer_surface(b->stfb, ST_SURFACE_BACK_LEFT, &surf_back);
1132
1133    if (!surf_front || !surf_back)
1134       return;
1135
1136    pipe->surface_copy(pipe,
1137                       surf_front, x, y,  /* dest */
1138                       surf_back, x, y,   /* src */
1139                       width, height);
1140 }
1141
1142
1143
1144 void XMesaFlush( XMesaContext c )
1145 {
1146    if (c && c->xm_visual->display) {
1147       st_finish(c->st);
1148       XSync( c->xm_visual->display, False );
1149    }
1150 }
1151
1152
1153
1154
1155
1156 XMesaBuffer XMesaFindBuffer( Display *dpy, Drawable d )
1157 {
1158    XMesaBuffer b;
1159    for (b = XMesaBufferList; b; b = b->Next) {
1160       if (b->drawable == d && b->xm_visual->display == dpy) {
1161          return b;
1162       }
1163    }
1164    return NULL;
1165 }
1166
1167
1168 /**
1169  * Free/destroy all XMesaBuffers associated with given display.
1170  */
1171 void xmesa_destroy_buffers_on_display(Display *dpy)
1172 {
1173    XMesaBuffer b, next;
1174    for (b = XMesaBufferList; b; b = next) {
1175       next = b->Next;
1176       if (b->xm_visual->display == dpy) {
1177          xmesa_free_buffer(b);
1178       }
1179    }
1180 }
1181
1182
1183 /*
1184  * Look for XMesaBuffers whose X window has been destroyed.
1185  * Deallocate any such XMesaBuffers.
1186  */
1187 void XMesaGarbageCollect( void )
1188 {
1189    XMesaBuffer b, next;
1190    for (b=XMesaBufferList; b; b=next) {
1191       next = b->Next;
1192       if (b->xm_visual &&
1193           b->xm_visual->display &&
1194           b->drawable &&
1195           b->type == WINDOW) {
1196          XSync(b->xm_visual->display, False);
1197          if (!window_exists( b->xm_visual->display, b->drawable )) {
1198             /* found a dead window, free the ancillary info */
1199             XMesaDestroyBuffer( b );
1200          }
1201       }
1202    }
1203 }
1204
1205
1206
1207
1208 PUBLIC void
1209 XMesaBindTexImage(Display *dpy, XMesaBuffer drawable, int buffer,
1210                   const int *attrib_list)
1211 {
1212 }
1213
1214
1215
1216 PUBLIC void
1217 XMesaReleaseTexImage(Display *dpy, XMesaBuffer drawable, int buffer)
1218 {
1219 }
1220