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  *
  39  * Byte swapping:  If the Mesa host and the X display use a different
  40  * byte order then there's some trickiness to be aware of when using
  41  * XImages.  The byte ordering used for the XImage is that of the X
  42  * display, not the Mesa host.
  43  * The color-to-pixel encoding for True/DirectColor must be done
  44  * according to the display's visual red_mask, green_mask, and blue_mask.
  45  * If XPutPixel is used to put a pixel into an XImage then XPutPixel will
  46  * do byte swapping if needed.  If one wants to directly "poke" the pixel
  47  * into the XImage's buffer then the pixel must be byte swapped first.
  48  *
  49  */
  50
  51 #ifdef __CYGWIN__
  52 #undef WIN32
  53 #undef __WIN32__
  54 #endif
  55
  56 #include "xm_api.h"
  57 #include "xm_st.h"
  58
  59 #include "main/context.h"
  60 #include "pipe/p_defines.h"
  61 #include "pipe/p_screen.h"
  62 #include "pipe/p_context.h"
  63
  64 #include "xm_public.h"
  65 #include <GL/glx.h>
  66
  67
  68 /* Driver interface routines, set up by xlib backend on library
  69  * _init().  These are global in the same way that function names are
  70  * global.
  71  */
  72 static struct xm_driver driver;
  73 static struct st_api *stapi;
  74
  75 void xmesa_set_driver( const struct xm_driver *templ )
  76 {
  77    driver = *templ;
  78    stapi = driver.create_st_api();
  79 }
  80
  81 static XMesaDisplay
  82 xmesa_init_display( Display *display )
  83 {
  84    pipe_static_mutex(init_mutex);
  85    static struct xmesa_display xm_display;
  86    XMesaDisplay xmdpy;
  87
  88    pipe_mutex_lock(init_mutex);
  89
  90    /* TODO support for multiple displays */
  91    xmdpy = &xm_display;
  92
  93    if (!xmdpy->display && display) {
  94       xmdpy->display = display;
  95       xmdpy->screen = driver.create_pipe_screen(display);
  96       xmdpy->smapi = CALLOC_STRUCT(st_manager);
  97       if (xmdpy->smapi)
  98          xmdpy->smapi->screen = xmdpy->screen;
  99
 100       if (xmdpy->screen && xmdpy->smapi) {
 101          pipe_mutex_init(xmdpy->mutex);
 102       }
 103       else {
 104          if (xmdpy->screen) {
 105             xmdpy->screen->destroy(xmdpy->screen);
 106             xmdpy->screen = NULL;
 107          }
 108          if (xmdpy->smapi) {
 109             FREE(xmdpy->smapi);
 110             xmdpy->smapi = NULL;
 111          }
 112
 113          xmdpy->display = NULL;
 114       }
 115    }
 116    if (!xmdpy->display || xmdpy->display != display)
 117       xmdpy = NULL;
 118
 119    pipe_mutex_unlock(init_mutex);
 120
 121    return xmdpy;
 122 }
 123
 124 /**********************************************************************/
 125 /*****                     X Utility Functions                    *****/
 126 /**********************************************************************/
 127
 128
 129 /**
 130  * Return the host's byte order as LSBFirst or MSBFirst ala X.
 131  */
 132 static int host_byte_order( void )
 133 {
 134    int i = 1;
 135    char *cptr = (char *) &i;
 136    return (*cptr==1) ? LSBFirst : MSBFirst;
 137 }
 138
 139
 140
 141
 142 /**
 143  * Return the true number of bits per pixel for XImages.
 144  * For example, if we request a 24-bit deep visual we may actually need/get
 145  * 32bpp XImages.  This function returns the appropriate bpp.
 146  * Input:  dpy - the X display
 147  *         visinfo - desribes the visual to be used for XImages
 148  * Return:  true number of bits per pixel for XImages
 149  */
 150 static int
 151 bits_per_pixel( XMesaVisual xmv )
 152 {
 153    Display *dpy = xmv->display;
 154    XVisualInfo * visinfo = xmv->visinfo;
 155    XImage *img;
 156    int bitsPerPixel;
 157    /* Create a temporary XImage */
 158    img = XCreateImage( dpy, visinfo->visual, visinfo->depth,
 159                        ZPixmap, 0,           /*format, offset*/
 160                        (char*) MALLOC(8),    /*data*/
 161                        1, 1,                 /*width, height*/
 162                        32,                   /*bitmap_pad*/
 163                        0                     /*bytes_per_line*/
 164                      );
 165    assert(img);
 166    /* grab the bits/pixel value */
 167    bitsPerPixel = img->bits_per_pixel;
 168    /* free the XImage */
 169    free( img->data );
 170    img->data = NULL;
 171    XDestroyImage( img );
 172    return bitsPerPixel;
 173 }
 174
 175
 176
 177 /*
 178  * Determine if a given X window ID is valid (window exists).
 179  * Do this by calling XGetWindowAttributes() for the window and
 180  * checking if we catch an X error.
 181  * Input:  dpy - the display
 182  *         win - the window to check for existance
 183  * Return:  GL_TRUE - window exists
 184  *          GL_FALSE - window doesn't exist
 185  */
 186 static GLboolean WindowExistsFlag;
 187
 188 static int window_exists_err_handler( Display* dpy, XErrorEvent* xerr )
 189 {
 190    (void) dpy;
 191    if (xerr->error_code == BadWindow) {
 192       WindowExistsFlag = GL_FALSE;
 193    }
 194    return 0;
 195 }
 196
 197 static GLboolean window_exists( Display *dpy, Window win )
 198 {
 199    XWindowAttributes wa;
 200    int (*old_handler)( Display*, XErrorEvent* );
 201    WindowExistsFlag = GL_TRUE;
 202    old_handler = XSetErrorHandler(window_exists_err_handler);
 203    XGetWindowAttributes( dpy, win, &wa ); /* dummy request */
 204    XSetErrorHandler(old_handler);
 205    return WindowExistsFlag;
 206 }
 207
 208 static Status
 209 get_drawable_size( Display *dpy, Drawable d, uint *width, uint *height )
 210 {
 211    Window root;
 212    Status stat;
 213    int xpos, ypos;
 214    unsigned int w, h, bw, depth;
 215    stat = XGetGeometry(dpy, d, &root, &xpos, &ypos, &w, &h, &bw, &depth);
 216    *width = w;
 217    *height = h;
 218    return stat;
 219 }
 220
 221
 222 /**
 223  * Return the size of the window (or pixmap) that corresponds to the
 224  * given XMesaBuffer.
 225  * \param width  returns width in pixels
 226  * \param height  returns height in pixels
 227  */
 228 void
 229 xmesa_get_window_size(Display *dpy, XMesaBuffer b,
 230                       GLuint *width, GLuint *height)
 231 {
 232    XMesaDisplay xmdpy = xmesa_init_display(dpy);
 233    Status stat;
 234
 235    pipe_mutex_lock(xmdpy->mutex);
 236    XSync(b->xm_visual->display, 0); /* added for Chromium */
 237    stat = get_drawable_size(dpy, b->ws.drawable, width, height);
 238    pipe_mutex_unlock(xmdpy->mutex);
 239
 240    if (!stat) {
 241       /* probably querying a window that's recently been destroyed */
 242       _mesa_warning(NULL, "XGetGeometry failed!\n");
 243       *width = *height = 1;
 244    }
 245 }
 246
 247 #define GET_REDMASK(__v)        __v->mesa_visual.redMask
 248 #define GET_GREENMASK(__v)      __v->mesa_visual.greenMask
 249 #define GET_BLUEMASK(__v)       __v->mesa_visual.blueMask
 250
 251
 252 /**
 253  * Choose the pixel format for the given visual.
 254  * This will tell the gallium driver how to pack pixel data into
 255  * drawing surfaces.
 256  */
 257 static GLuint
 258 choose_pixel_format(XMesaVisual v)
 259 {
 260    boolean native_byte_order = (host_byte_order() ==
 261                                 ImageByteOrder(v->display));
 262
 263    if (   GET_REDMASK(v)   == 0x0000ff
 264        && GET_GREENMASK(v) == 0x00ff00
 265        && GET_BLUEMASK(v)  == 0xff0000
 266        && v->BitsPerPixel == 32) {
 267       if (native_byte_order) {
 268          /* no byteswapping needed */
 269          return PIPE_FORMAT_R8G8B8A8_UNORM;
 270       }
 271       else {
 272          return PIPE_FORMAT_A8B8G8R8_UNORM;
 273       }
 274    }
 275    else if (   GET_REDMASK(v)   == 0xff0000
 276             && GET_GREENMASK(v) == 0x00ff00
 277             && GET_BLUEMASK(v)  == 0x0000ff
 278             && v->BitsPerPixel == 32) {
 279       if (native_byte_order) {
 280          /* no byteswapping needed */
 281          return PIPE_FORMAT_B8G8R8A8_UNORM;
 282       }
 283       else {
 284          return PIPE_FORMAT_A8R8G8B8_UNORM;
 285       }
 286    }
 287    else if (   GET_REDMASK(v)   == 0x0000ff00
 288             && GET_GREENMASK(v) == 0x00ff0000
 289             && GET_BLUEMASK(v)  == 0xff000000
 290             && v->BitsPerPixel == 32) {
 291       if (native_byte_order) {
 292          /* no byteswapping needed */
 293          return PIPE_FORMAT_A8R8G8B8_UNORM;
 294       }
 295       else {
 296          return PIPE_FORMAT_B8G8R8A8_UNORM;
 297       }
 298    }
 299    else if (   GET_REDMASK(v)   == 0xf800
 300             && GET_GREENMASK(v) == 0x07e0
 301             && GET_BLUEMASK(v)  == 0x001f
 302             && native_byte_order
 303             && v->BitsPerPixel == 16) {
 304       /* 5-6-5 RGB */
 305       return PIPE_FORMAT_B5G6R5_UNORM;
 306    }
 307
 308    assert(0);
 309    return 0;
 310 }
 311
 312
 313 /**
 314  * Choose a depth/stencil format that satisfies the given depth and
 315  * stencil sizes.
 316  */
 317 static enum pipe_format
 318 choose_depth_stencil_format(XMesaDisplay xmdpy, int depth, int stencil)
 319 {
 320    const enum pipe_texture_target target = PIPE_TEXTURE_2D;
 321    const unsigned tex_usage = PIPE_TEXTURE_USAGE_DEPTH_STENCIL;
 322    const unsigned geom_flags = (PIPE_TEXTURE_GEOM_NON_SQUARE |
 323                                 PIPE_TEXTURE_GEOM_NON_POWER_OF_TWO);
 324    enum pipe_format formats[8], fmt;
 325    int count, i;
 326
 327    count = 0;
 328
 329    if (depth <= 16 && stencil == 0) {
 330       formats[count++] = PIPE_FORMAT_Z16_UNORM;
 331    }
 332    if (depth <= 24 && stencil == 0) {
 333       formats[count++] = PIPE_FORMAT_X8Z24_UNORM;
 334       formats[count++] = PIPE_FORMAT_Z24X8_UNORM;
 335    }
 336    if (depth <= 24 && stencil <= 8) {
 337       formats[count++] = PIPE_FORMAT_S8Z24_UNORM;
 338       formats[count++] = PIPE_FORMAT_Z24S8_UNORM;
 339    }
 340    if (depth <= 32 && stencil == 0) {
 341       formats[count++] = PIPE_FORMAT_Z32_UNORM;
 342    }
 343
 344    fmt = PIPE_FORMAT_NONE;
 345    for (i = 0; i < count; i++) {
 346       if (xmdpy->screen->is_format_supported(xmdpy->screen, formats[i],
 347                                       target, tex_usage, geom_flags)) {
 348          fmt = formats[i];
 349          break;
 350       }
 351    }
 352
 353    return fmt;
 354 }
 355
 356
 357
 358 /**********************************************************************/
 359 /*****                Linked list of XMesaBuffers                 *****/
 360 /**********************************************************************/
 361
 362 static XMesaBuffer XMesaBufferList = NULL;
 363
 364
 365 /**
 366  * Allocate a new XMesaBuffer object which corresponds to the given drawable.
 367  * Note that XMesaBuffer is derived from GLframebuffer.
 368  * The new XMesaBuffer will not have any size (Width=Height=0).
 369  *
 370  * \param d  the corresponding X drawable (window or pixmap)
 371  * \param type  either WINDOW, PIXMAP or PBUFFER, describing d
 372  * \param vis  the buffer's visual
 373  * \param cmap  the window's colormap, if known.
 374  * \return new XMesaBuffer or NULL if any problem
 375  */
 376 static XMesaBuffer
 377 create_xmesa_buffer(Drawable d, BufferType type,
 378                     XMesaVisual vis, Colormap cmap)
 379 {
 380    XMesaDisplay xmdpy = xmesa_init_display(vis->display);
 381    XMesaBuffer b;
 382    uint width, height;
 383
 384    ASSERT(type == WINDOW || type == PIXMAP || type == PBUFFER);
 385
 386    if (!xmdpy)
 387       return NULL;
 388
 389    b = (XMesaBuffer) CALLOC_STRUCT(xmesa_buffer);
 390    if (!b)
 391       return NULL;
 392
 393    b->ws.drawable = d;
 394    b->ws.visual = vis->visinfo->visual;
 395    b->ws.depth = vis->visinfo->depth;
 396
 397    b->xm_visual = vis;
 398    b->type = type;
 399    b->cmap = cmap;
 400
 401    get_drawable_size(vis->display, d, &width, &height);
 402
 403    /*
 404     * Create framebuffer, but we'll plug in our own renderbuffers below.
 405     */
 406    b->stfb = xmesa_create_st_framebuffer(xmdpy, b);
 407
 408    /* GLX_EXT_texture_from_pixmap */
 409    b->TextureTarget = 0;
 410    b->TextureFormat = GLX_TEXTURE_FORMAT_NONE_EXT;
 411    b->TextureMipmap = 0;
 412
 413    /* insert buffer into linked list */
 414    b->Next = XMesaBufferList;
 415    XMesaBufferList = b;
 416
 417    return b;
 418 }
 419
 420
 421 /**
 422  * Find an XMesaBuffer by matching X display and colormap but NOT matching
 423  * the notThis buffer.
 424  */
 425 XMesaBuffer
 426 xmesa_find_buffer(Display *dpy, Colormap cmap, XMesaBuffer notThis)
 427 {
 428    XMesaBuffer b;
 429    for (b = XMesaBufferList; b; b = b->Next) {
 430       if (b->xm_visual->display == dpy &&
 431           b->cmap == cmap &&
 432           b != notThis) {
 433          return b;
 434       }
 435    }
 436    return NULL;
 437 }
 438
 439
 440 /**
 441  * Remove buffer from linked list, delete if no longer referenced.
 442  */
 443 static void
 444 xmesa_free_buffer(XMesaBuffer buffer)
 445 {
 446    XMesaBuffer prev = NULL, b;
 447
 448    for (b = XMesaBufferList; b; b = b->Next) {
 449       if (b == buffer) {
 450          /* unlink buffer from list */
 451          if (prev)
 452             prev->Next = buffer->Next;
 453          else
 454             XMesaBufferList = buffer->Next;
 455
 456          /* Since the X window for the XMesaBuffer is going away, we don't
 457           * want to dereference this pointer in the future.
 458           */
 459          b->ws.drawable = 0;
 460
 461          /* XXX we should move the buffer to a delete-pending list and destroy
 462           * the buffer until it is no longer current.
 463           */
 464          xmesa_destroy_st_framebuffer(buffer->stfb);
 465
 466          free(buffer);
 467
 468          return;
 469       }
 470       /* continue search */
 471       prev = b;
 472    }
 473    /* buffer not found in XMesaBufferList */
 474    _mesa_problem(NULL,"xmesa_free_buffer() - buffer not found\n");
 475 }
 476
 477
 478
 479 /**********************************************************************/
 480 /*****                   Misc Private Functions                   *****/
 481 /**********************************************************************/
 482
 483
 484 /**
 485  * When a context is bound for the first time, we can finally finish
 486  * initializing the context's visual and buffer information.
 487  * \param v  the XMesaVisual to initialize
 488  * \param b  the XMesaBuffer to initialize (may be NULL)
 489  * \param rgb_flag  TRUE = RGBA mode, FALSE = color index mode
 490  * \param window  the window/pixmap we're rendering into
 491  * \param cmap  the colormap associated with the window/pixmap
 492  * \return GL_TRUE=success, GL_FALSE=failure
 493  */
 494 static GLboolean
 495 initialize_visual_and_buffer(XMesaVisual v, XMesaBuffer b,
 496                              GLboolean rgb_flag, Drawable window,
 497                              Colormap cmap)
 498 {
 499    ASSERT(!b || b->xm_visual == v);
 500
 501    /* Save true bits/pixel */
 502    v->BitsPerPixel = bits_per_pixel(v);
 503    assert(v->BitsPerPixel > 0);
 504
 505    if (rgb_flag == GL_FALSE) {
 506       /* COLOR-INDEXED WINDOW: not supported*/
 507       return GL_FALSE;
 508    }
 509    else {
 510       /* RGB WINDOW:
 511        * We support RGB rendering into almost any kind of visual.
 512        */
 513       const int xclass = v->mesa_visual.visualType;
 514       if (xclass != GLX_TRUE_COLOR && xclass == !GLX_DIRECT_COLOR) {
 515          _mesa_warning(NULL,
 516             "XMesa: RGB mode rendering not supported in given visual.\n");
 517          return GL_FALSE;
 518       }
 519       v->mesa_visual.indexBits = 0;
 520
 521       if (v->BitsPerPixel == 32) {
 522          /* We use XImages for all front/back buffers.  If an X Window or
 523           * X Pixmap is 32bpp, there's no guarantee that the alpha channel
 524           * will be preserved.  For XImages we're in luck.
 525           */
 526          v->mesa_visual.alphaBits = 8;
 527       }
 528    }
 529
 530    /*
 531     * If MESA_INFO env var is set print out some debugging info
 532     * which can help Brian figure out what's going on when a user
 533     * reports bugs.
 534     */
 535    if (_mesa_getenv("MESA_INFO")) {
 536       printf("X/Mesa visual = %p\n", (void *) v);
 537       printf("X/Mesa level = %d\n", v->mesa_visual.level);
 538       printf("X/Mesa depth = %d\n", v->visinfo->depth);
 539       printf("X/Mesa bits per pixel = %d\n", v->BitsPerPixel);
 540    }
 541
 542    return GL_TRUE;
 543 }
 544
 545
 546
 547 #define NUM_VISUAL_TYPES   6
 548
 549 /**
 550  * Convert an X visual type to a GLX visual type.
 551  *
 552  * \param visualType X visual type (i.e., \c TrueColor, \c StaticGray, etc.)
 553  *        to be converted.
 554  * \return If \c visualType is a valid X visual type, a GLX visual type will
 555  *         be returned.  Otherwise \c GLX_NONE will be returned.
 556  *
 557  * \note
 558  * This code was lifted directly from lib/GL/glx/glcontextmodes.c in the
 559  * DRI CVS tree.
 560  */
 561 static GLint
 562 xmesa_convert_from_x_visual_type( int visualType )
 563 {
 564     static const int glx_visual_types[ NUM_VISUAL_TYPES ] = {
 565         GLX_STATIC_GRAY,  GLX_GRAY_SCALE,
 566         GLX_STATIC_COLOR, GLX_PSEUDO_COLOR,
 567         GLX_TRUE_COLOR,   GLX_DIRECT_COLOR
 568     };
 569
 570     return ( (unsigned) visualType < NUM_VISUAL_TYPES )
 571         ? glx_visual_types[ visualType ] : GLX_NONE;
 572 }
 573
 574
 575 /**********************************************************************/
 576 /*****                       Public Functions                     *****/
 577 /**********************************************************************/
 578
 579
 580 /*
 581  * Create a new X/Mesa visual.
 582  * Input:  display - X11 display
 583  *         visinfo - an XVisualInfo pointer
 584  *         rgb_flag - GL_TRUE = RGB mode,
 585  *                    GL_FALSE = color index mode
 586  *         alpha_flag - alpha buffer requested?
 587  *         db_flag - GL_TRUE = double-buffered,
 588  *                   GL_FALSE = single buffered
 589  *         stereo_flag - stereo visual?
 590  *         ximage_flag - GL_TRUE = use an XImage for back buffer,
 591  *                       GL_FALSE = use an off-screen pixmap for back buffer
 592  *         depth_size - requested bits/depth values, or zero
 593  *         stencil_size - requested bits/stencil values, or zero
 594  *         accum_red_size - requested bits/red accum values, or zero
 595  *         accum_green_size - requested bits/green accum values, or zero
 596  *         accum_blue_size - requested bits/blue accum values, or zero
 597  *         accum_alpha_size - requested bits/alpha accum values, or zero
 598  *         num_samples - number of samples/pixel if multisampling, or zero
 599  *         level - visual level, usually 0
 600  *         visualCaveat - ala the GLX extension, usually GLX_NONE
 601  * Return;  a new XMesaVisual or 0 if error.
 602  */
 603 PUBLIC
 604 XMesaVisual XMesaCreateVisual( Display *display,
 605                                XVisualInfo * visinfo,
 606                                GLboolean rgb_flag,
 607                                GLboolean alpha_flag,
 608                                GLboolean db_flag,
 609                                GLboolean stereo_flag,
 610                                GLboolean ximage_flag,
 611                                GLint depth_size,
 612                                GLint stencil_size,
 613                                GLint accum_red_size,
 614                                GLint accum_green_size,
 615                                GLint accum_blue_size,
 616                                GLint accum_alpha_size,
 617                                GLint num_samples,
 618                                GLint level,
 619                                GLint visualCaveat )
 620 {
 621    XMesaDisplay xmdpy = xmesa_init_display(display);
 622    XMesaVisual v;
 623    GLint red_bits, green_bits, blue_bits, alpha_bits;
 624
 625    if (!xmdpy)
 626       return NULL;
 627
 628    /* For debugging only */
 629    if (_mesa_getenv("MESA_XSYNC")) {
 630       /* This makes debugging X easier.
 631        * In your debugger, set a breakpoint on _XError to stop when an
 632        * X protocol error is generated.
 633        */
 634       XSynchronize( display, 1 );
 635    }
 636
 637    v = (XMesaVisual) CALLOC_STRUCT(xmesa_visual);
 638    if (!v) {
 639       return NULL;
 640    }
 641
 642    v->display = display;
 643
 644    /* Save a copy of the XVisualInfo struct because the user may Xfree()
 645     * the struct but we may need some of the information contained in it
 646     * at a later time.
 647     */
 648    v->visinfo = (XVisualInfo *) MALLOC(sizeof(*visinfo));
 649    if (!v->visinfo) {
 650       free(v);
 651       return NULL;
 652    }
 653    memcpy(v->visinfo, visinfo, sizeof(*visinfo));
 654
 655    v->ximage_flag = ximage_flag;
 656
 657    v->mesa_visual.redMask = visinfo->red_mask;
 658    v->mesa_visual.greenMask = visinfo->green_mask;
 659    v->mesa_visual.blueMask = visinfo->blue_mask;
 660    v->mesa_visual.visualID = visinfo->visualid;
 661    v->mesa_visual.screen = visinfo->screen;
 662
 663 #if !(defined(__cplusplus) || defined(c_plusplus))
 664    v->mesa_visual.visualType = xmesa_convert_from_x_visual_type(visinfo->class);
 665 #else
 666    v->mesa_visual.visualType = xmesa_convert_from_x_visual_type(visinfo->c_class);
 667 #endif
 668
 669    v->mesa_visual.visualRating = visualCaveat;
 670
 671    if (alpha_flag)
 672       v->mesa_visual.alphaBits = 8;
 673
 674    (void) initialize_visual_and_buffer( v, NULL, rgb_flag, 0, 0 );
 675
 676    {
 677       const int xclass = v->mesa_visual.visualType;
 678       if (xclass == GLX_TRUE_COLOR || xclass == GLX_DIRECT_COLOR) {
 679          red_bits   = _mesa_bitcount(GET_REDMASK(v));
 680          green_bits = _mesa_bitcount(GET_GREENMASK(v));
 681          blue_bits  = _mesa_bitcount(GET_BLUEMASK(v));
 682       }
 683       else {
 684          /* this is an approximation */
 685          int depth;
 686          depth = v->visinfo->depth;
 687          red_bits = depth / 3;
 688          depth -= red_bits;
 689          green_bits = depth / 2;
 690          depth -= green_bits;
 691          blue_bits = depth;
 692          alpha_bits = 0;
 693          assert( red_bits + green_bits + blue_bits == v->visinfo->depth );
 694       }
 695       alpha_bits = v->mesa_visual.alphaBits;
 696    }
 697
 698    _mesa_initialize_visual( &v->mesa_visual,
 699                             db_flag, stereo_flag,
 700                             red_bits, green_bits,
 701                             blue_bits, alpha_bits,
 702                             depth_size,
 703                             stencil_size,
 704                             accum_red_size, accum_green_size,
 705                             accum_blue_size, accum_alpha_size,
 706                             0 );
 707
 708    v->stvis.buffer_mask = ST_ATTACHMENT_FRONT_LEFT_MASK;
 709    if (db_flag)
 710       v->stvis.buffer_mask |= ST_ATTACHMENT_BACK_LEFT_MASK;
 711    if (stereo_flag) {
 712       v->stvis.buffer_mask |= ST_ATTACHMENT_FRONT_RIGHT_MASK;
 713       if (db_flag)
 714          v->stvis.buffer_mask |= ST_ATTACHMENT_BACK_RIGHT_MASK;
 715    }
 716
 717    v->stvis.color_format = choose_pixel_format(v);
 718    v->stvis.depth_stencil_format =
 719       choose_depth_stencil_format(xmdpy, depth_size, stencil_size);
 720
 721    v->stvis.accum_format = (accum_red_size +
 722          accum_green_size + accum_blue_size + accum_alpha_size) ?
 723       PIPE_FORMAT_R16G16B16A16_SNORM : PIPE_FORMAT_NONE;
 724
 725    v->stvis.samples = num_samples;
 726    v->stvis.render_buffer = ST_ATTACHMENT_INVALID;
 727
 728    /* XXX minor hack */
 729    v->mesa_visual.level = level;
 730    return v;
 731 }
 732
 733
 734 PUBLIC
 735 void XMesaDestroyVisual( XMesaVisual v )
 736 {
 737    free(v->visinfo);
 738    free(v);
 739 }
 740
 741
 742 /**
 743  * Do per-display initializations.
 744  */
 745 void
 746 xmesa_init( Display *display )
 747 {
 748    xmesa_init_display(display);
 749 }
 750
 751
 752 /**
 753  * Create a new XMesaContext.
 754  * \param v  the XMesaVisual
 755  * \param share_list  another XMesaContext with which to share display
 756  *                    lists or NULL if no sharing is wanted.
 757  * \return an XMesaContext or NULL if error.
 758  */
 759 PUBLIC
 760 XMesaContext XMesaCreateContext( XMesaVisual v, XMesaContext share_list )
 761 {
 762    XMesaDisplay xmdpy = xmesa_init_display(v->display);
 763    XMesaContext c;
 764
 765    if (!xmdpy)
 766       return NULL;
 767
 768    /* Note: the XMesaContext contains a Mesa GLcontext struct (inheritance) */
 769    c = (XMesaContext) CALLOC_STRUCT(xmesa_context);
 770    if (!c)
 771       return NULL;
 772
 773    c->xm_visual = v;
 774    c->xm_buffer = NULL;   /* set later by XMesaMakeCurrent */
 775    c->xm_read_buffer = NULL;
 776
 777    c->st = stapi->create_context(stapi, xmdpy->smapi,
 778          &v->stvis, (share_list) ? share_list->st : NULL);
 779    if (c->st == NULL)
 780       goto fail;
 781
 782    c->st->st_manager_private = (void *) c;
 783
 784    return c;
 785
 786 fail:
 787    if (c->st)
 788       c->st->destroy(c->st);
 789
 790    free(c);
 791    return NULL;
 792 }
 793
 794
 795
 796 PUBLIC
 797 void XMesaDestroyContext( XMesaContext c )
 798 {
 799    c->st->destroy(c->st);
 800
 801    /* FIXME: We should destroy the screen here, but if we do so, surfaces may
 802     * outlive it, causing segfaults
 803    struct pipe_screen *screen = c->st->pipe->screen;
 804    screen->destroy(screen);
 805    */
 806
 807    free(c);
 808 }
 809
 810
 811
 812 /**
 813  * Private function for creating an XMesaBuffer which corresponds to an
 814  * X window or pixmap.
 815  * \param v  the window's XMesaVisual
 816  * \param w  the window we're wrapping
 817  * \return  new XMesaBuffer or NULL if error
 818  */
 819 PUBLIC XMesaBuffer
 820 XMesaCreateWindowBuffer(XMesaVisual v, Window w)
 821 {
 822    XWindowAttributes attr;
 823    XMesaBuffer b;
 824    Colormap cmap;
 825    int depth;
 826
 827    assert(v);
 828    assert(w);
 829
 830    /* Check that window depth matches visual depth */
 831    XGetWindowAttributes( v->display, w, &attr );
 832    depth = attr.depth;
 833    if (v->visinfo->depth != depth) {
 834       _mesa_warning(NULL, "XMesaCreateWindowBuffer: depth mismatch between visual (%d) and window (%d)!\n",
 835                     v->visinfo->depth, depth);
 836       return NULL;
 837    }
 838
 839    /* Find colormap */
 840    if (attr.colormap) {
 841       cmap = attr.colormap;
 842    }
 843    else {
 844       _mesa_warning(NULL, "Window %u has no colormap!\n", (unsigned int) w);
 845       /* this is weird, a window w/out a colormap!? */
 846       /* OK, let's just allocate a new one and hope for the best */
 847       cmap = XCreateColormap(v->display, w, attr.visual, AllocNone);
 848    }
 849
 850    b = create_xmesa_buffer((Drawable) w, WINDOW, v, cmap);
 851    if (!b)
 852       return NULL;
 853
 854    if (!initialize_visual_and_buffer( v, b, v->mesa_visual.rgbMode,
 855                                       (Drawable) w, cmap )) {
 856       xmesa_free_buffer(b);
 857       return NULL;
 858    }
 859
 860    return b;
 861 }
 862
 863
 864
 865 /**
 866  * Create a new XMesaBuffer from an X pixmap.
 867  *
 868  * \param v    the XMesaVisual
 869  * \param p    the pixmap
 870  * \param cmap the colormap, may be 0 if using a \c GLX_TRUE_COLOR or
 871  *             \c GLX_DIRECT_COLOR visual for the pixmap
 872  * \returns new XMesaBuffer or NULL if error
 873  */
 874 PUBLIC XMesaBuffer
 875 XMesaCreatePixmapBuffer(XMesaVisual v, Pixmap p, Colormap cmap)
 876 {
 877    XMesaBuffer b;
 878
 879    assert(v);
 880
 881    b = create_xmesa_buffer((Drawable) p, PIXMAP, v, cmap);
 882    if (!b)
 883       return NULL;
 884
 885    if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
 886                                      (Drawable) p, cmap)) {
 887       xmesa_free_buffer(b);
 888       return NULL;
 889    }
 890
 891    return b;
 892 }
 893
 894
 895 /**
 896  * For GLX_EXT_texture_from_pixmap
 897  */
 898 XMesaBuffer
 899 XMesaCreatePixmapTextureBuffer(XMesaVisual v, Pixmap p,
 900                                Colormap cmap,
 901                                int format, int target, int mipmap)
 902 {
 903    GET_CURRENT_CONTEXT(ctx);
 904    XMesaBuffer b;
 905
 906    assert(v);
 907
 908    b = create_xmesa_buffer((Drawable) p, PIXMAP, v, cmap);
 909    if (!b)
 910       return NULL;
 911
 912    /* get pixmap size */
 913    xmesa_get_window_size(v->display, b, &b->width, &b->height);
 914
 915    if (target == 0) {
 916       /* examine dims */
 917       if (ctx->Extensions.ARB_texture_non_power_of_two) {
 918          target = GLX_TEXTURE_2D_EXT;
 919       }
 920       else if (   _mesa_bitcount(b->width)  == 1
 921                && _mesa_bitcount(b->height) == 1) {
 922          /* power of two size */
 923          if (b->height == 1) {
 924             target = GLX_TEXTURE_1D_EXT;
 925          }
 926          else {
 927             target = GLX_TEXTURE_2D_EXT;
 928          }
 929       }
 930       else if (ctx->Extensions.NV_texture_rectangle) {
 931          target = GLX_TEXTURE_RECTANGLE_EXT;
 932       }
 933       else {
 934          /* non power of two textures not supported */
 935          XMesaDestroyBuffer(b);
 936          return 0;
 937       }
 938    }
 939
 940    b->TextureTarget = target;
 941    b->TextureFormat = format;
 942    b->TextureMipmap = mipmap;
 943
 944    if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
 945                                      (Drawable) p, cmap)) {
 946       xmesa_free_buffer(b);
 947       return NULL;
 948    }
 949
 950    return b;
 951 }
 952
 953
 954
 955 XMesaBuffer
 956 XMesaCreatePBuffer(XMesaVisual v, Colormap cmap,
 957                    unsigned int width, unsigned int height)
 958 {
 959    Window root;
 960    Drawable drawable;  /* X Pixmap Drawable */
 961    XMesaBuffer b;
 962
 963    /* allocate pixmap for front buffer */
 964    root = RootWindow( v->display, v->visinfo->screen );
 965    drawable = XCreatePixmap(v->display, root, width, height,
 966                             v->visinfo->depth);
 967    if (!drawable)
 968       return NULL;
 969
 970    b = create_xmesa_buffer(drawable, PBUFFER, v, cmap);
 971    if (!b)
 972       return NULL;
 973
 974    if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
 975                                      drawable, cmap)) {
 976       xmesa_free_buffer(b);
 977       return NULL;
 978    }
 979
 980    return b;
 981 }
 982
 983
 984
 985 /*
 986  * Deallocate an XMesaBuffer structure and all related info.
 987  */
 988 PUBLIC void
 989 XMesaDestroyBuffer(XMesaBuffer b)
 990 {
 991    xmesa_free_buffer(b);
 992 }
 993
 994
 995 /**
 996  * Query the current drawable size and notify the binding context.
 997  */
 998 void
 999 xmesa_check_buffer_size(XMesaBuffer b)
1000 {
1001    XMesaContext xmctx = XMesaGetCurrentContext();
1002
1003    if (b->type == PBUFFER)
1004       return;
1005
1006    xmesa_get_window_size(b->xm_visual->display, b, &b->width, &b->height);
1007    if (xmctx && xmctx->xm_buffer == b)
1008       xmctx->st->notify_invalid_framebuffer(xmctx->st, b->stfb);
1009 }
1010
1011
1012 /*
1013  * Bind buffer b to context c and make c the current rendering context.
1014  */
1015 PUBLIC
1016 GLboolean XMesaMakeCurrent2( XMesaContext c, XMesaBuffer drawBuffer,
1017                              XMesaBuffer readBuffer )
1018 {
1019    XMesaContext old_ctx = XMesaGetCurrentContext();
1020
1021    if (old_ctx && old_ctx != c) {
1022       XMesaFlush(old_ctx);
1023       old_ctx->xm_buffer = NULL;
1024       old_ctx->xm_read_buffer = NULL;
1025    }
1026
1027    if (c) {
1028       if (!drawBuffer || !readBuffer)
1029          return GL_FALSE;  /* must specify buffers! */
1030
1031       if (c == old_ctx &&
1032           c->xm_buffer == drawBuffer &&
1033           c->xm_read_buffer == readBuffer)
1034          return GL_TRUE;
1035
1036       xmesa_check_buffer_size(drawBuffer);
1037       if (readBuffer != drawBuffer)
1038          xmesa_check_buffer_size(readBuffer);
1039
1040       c->xm_buffer = drawBuffer;
1041       c->xm_read_buffer = readBuffer;
1042
1043       stapi->make_current(stapi, c->st, drawBuffer->stfb, readBuffer->stfb);
1044
1045       /* Solution to Stephane Rehel's problem with glXReleaseBuffersMESA(): */
1046       drawBuffer->wasCurrent = GL_TRUE;
1047    }
1048    else {
1049       /* Detach */
1050       stapi->make_current(stapi, NULL, NULL, NULL);
1051
1052    }
1053    return GL_TRUE;
1054 }
1055
1056
1057 /*
1058  * Unbind the context c from its buffer.
1059  */
1060 GLboolean XMesaUnbindContext( XMesaContext c )
1061 {
1062    /* A no-op for XFree86 integration purposes */
1063    return GL_TRUE;
1064 }
1065
1066
1067 XMesaContext XMesaGetCurrentContext( void )
1068 {
1069    struct st_context_iface *st = stapi->get_current(stapi);
1070    return (XMesaContext) (st) ? st->st_manager_private : NULL;
1071 }
1072
1073
1074
1075 /**
1076  * Swap front and back color buffers and have winsys display front buffer.
1077  * If there's no front color buffer no swap actually occurs.
1078  */
1079 PUBLIC
1080 void XMesaSwapBuffers( XMesaBuffer b )
1081 {
1082    XMesaContext xmctx = XMesaGetCurrentContext();
1083
1084    if (xmctx && xmctx->xm_buffer == b) {
1085       xmctx->st->flush( xmctx->st,
1086             PIPE_FLUSH_RENDER_CACHE |
1087             PIPE_FLUSH_SWAPBUFFERS |
1088             PIPE_FLUSH_FRAME,
1089             NULL);
1090    }
1091
1092    xmesa_swap_st_framebuffer(b->stfb);
1093 }
1094
1095
1096
1097 /*
1098  * Copy sub-region of back buffer to front buffer
1099  */
1100 void XMesaCopySubBuffer( XMesaBuffer b, int x, int y, int width, int height )
1101 {
1102    xmesa_copy_st_framebuffer(b->stfb,
1103          ST_ATTACHMENT_BACK_LEFT, ST_ATTACHMENT_FRONT_LEFT,
1104          x, y, width, height);
1105 }
1106
1107
1108
1109 void XMesaFlush( XMesaContext c )
1110 {
1111    if (c && c->xm_visual->display) {
1112       XMesaDisplay xmdpy = xmesa_init_display(c->xm_visual->display);
1113       struct pipe_fence_handle *fence = NULL;
1114
1115       c->st->flush(c->st, PIPE_FLUSH_RENDER_CACHE | PIPE_FLUSH_FRAME, &fence);
1116       if (fence) {
1117          xmdpy->screen->fence_finish(xmdpy->screen, fence, 0);
1118          xmdpy->screen->fence_reference(xmdpy->screen, &fence, NULL);
1119       }
1120       XSync( c->xm_visual->display, False );
1121    }
1122 }
1123
1124
1125
1126
1127
1128 XMesaBuffer XMesaFindBuffer( Display *dpy, Drawable d )
1129 {
1130    XMesaBuffer b;
1131    for (b = XMesaBufferList; b; b = b->Next) {
1132       if (b->ws.drawable == d && b->xm_visual->display == dpy) {
1133          return b;
1134       }
1135    }
1136    return NULL;
1137 }
1138
1139
1140 /**
1141  * Free/destroy all XMesaBuffers associated with given display.
1142  */
1143 void xmesa_destroy_buffers_on_display(Display *dpy)
1144 {
1145    XMesaBuffer b, next;
1146    for (b = XMesaBufferList; b; b = next) {
1147       next = b->Next;
1148       if (b->xm_visual->display == dpy) {
1149          xmesa_free_buffer(b);
1150       }
1151    }
1152 }
1153
1154
1155 /*
1156  * Look for XMesaBuffers whose X window has been destroyed.
1157  * Deallocate any such XMesaBuffers.
1158  */
1159 void XMesaGarbageCollect( void )
1160 {
1161    XMesaBuffer b, next;
1162    for (b=XMesaBufferList; b; b=next) {
1163       next = b->Next;
1164       if (b->xm_visual &&
1165           b->xm_visual->display &&
1166           b->ws.drawable &&
1167           b->type == WINDOW) {
1168          XSync(b->xm_visual->display, False);
1169          if (!window_exists( b->xm_visual->display, b->ws.drawable )) {
1170             /* found a dead window, free the ancillary info */
1171             XMesaDestroyBuffer( b );
1172          }
1173       }
1174    }
1175 }
1176
1177
1178
1179
1180 PUBLIC void
1181 XMesaBindTexImage(Display *dpy, XMesaBuffer drawable, int buffer,
1182                   const int *attrib_list)
1183 {
1184 }
1185
1186
1187
1188 PUBLIC void
1189 XMesaReleaseTexImage(Display *dpy, XMesaBuffer drawable, int buffer)
1190 {
1191 }
1192
1193
1194 void
1195 XMesaCopyContext(XMesaContext src, XMesaContext dst, unsigned long mask)
1196 {
1197    if (dst->st->copy)
1198       dst->st->copy(dst->st, src->st, mask);
1199 }