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  * Choose a depth/stencil format that is "better" than the given depth and
 314  * stencil sizes.
 315  */
 316 static enum pipe_format
 317 choose_depth_stencil_format(XMesaDisplay xmdpy, int depth, int stencil)
 318 {
 319    const enum pipe_texture_target target = PIPE_TEXTURE_2D;
 320    const unsigned tex_usage = PIPE_TEXTURE_USAGE_DEPTH_STENCIL;
 321    const unsigned geom_flags = (PIPE_TEXTURE_GEOM_NON_SQUARE |
 322                                 PIPE_TEXTURE_GEOM_NON_POWER_OF_TWO);
 323    enum pipe_format formats[8], fmt;
 324    int count, i;
 325
 326    count = 0;
 327    if (depth <= 24 && stencil <= 8) {
 328       formats[count++] = PIPE_FORMAT_S8Z24_UNORM;
 329       formats[count++] = PIPE_FORMAT_Z24S8_UNORM;
 330    }
 331
 332    if (!stencil) {
 333       if (depth <= 16)
 334          formats[count++] = PIPE_FORMAT_Z16_UNORM;
 335       if (depth <= 32)
 336          formats[count++] = PIPE_FORMAT_Z32_UNORM;
 337    }
 338
 339    fmt = PIPE_FORMAT_NONE;
 340    for (i = 0; i < count; i++) {
 341       if (xmdpy->screen->is_format_supported(xmdpy->screen, formats[i],
 342                                       target, tex_usage, geom_flags)) {
 343          fmt = formats[i];
 344          break;
 345       }
 346    }
 347
 348    return fmt;
 349 }
 350
 351
 352
 353 /**********************************************************************/
 354 /*****                Linked list of XMesaBuffers                 *****/
 355 /**********************************************************************/
 356
 357 static XMesaBuffer XMesaBufferList = NULL;
 358
 359
 360 /**
 361  * Allocate a new XMesaBuffer object which corresponds to the given drawable.
 362  * Note that XMesaBuffer is derived from GLframebuffer.
 363  * The new XMesaBuffer will not have any size (Width=Height=0).
 364  *
 365  * \param d  the corresponding X drawable (window or pixmap)
 366  * \param type  either WINDOW, PIXMAP or PBUFFER, describing d
 367  * \param vis  the buffer's visual
 368  * \param cmap  the window's colormap, if known.
 369  * \return new XMesaBuffer or NULL if any problem
 370  */
 371 static XMesaBuffer
 372 create_xmesa_buffer(Drawable d, BufferType type,
 373                     XMesaVisual vis, Colormap cmap)
 374 {
 375    XMesaDisplay xmdpy = xmesa_init_display(vis->display);
 376    XMesaBuffer b;
 377    uint width, height;
 378
 379    ASSERT(type == WINDOW || type == PIXMAP || type == PBUFFER);
 380
 381    if (!xmdpy)
 382       return NULL;
 383
 384    b = (XMesaBuffer) CALLOC_STRUCT(xmesa_buffer);
 385    if (!b)
 386       return NULL;
 387
 388    b->ws.drawable = d;
 389    b->ws.visual = vis->visinfo->visual;
 390    b->ws.depth = vis->visinfo->depth;
 391
 392    b->xm_visual = vis;
 393    b->type = type;
 394    b->cmap = cmap;
 395
 396    get_drawable_size(vis->display, d, &width, &height);
 397
 398    /*
 399     * Create framebuffer, but we'll plug in our own renderbuffers below.
 400     */
 401    b->stfb = xmesa_create_st_framebuffer(xmdpy, b);
 402
 403    /* GLX_EXT_texture_from_pixmap */
 404    b->TextureTarget = 0;
 405    b->TextureFormat = GLX_TEXTURE_FORMAT_NONE_EXT;
 406    b->TextureMipmap = 0;
 407
 408    /* insert buffer into linked list */
 409    b->Next = XMesaBufferList;
 410    XMesaBufferList = b;
 411
 412    return b;
 413 }
 414
 415
 416 /**
 417  * Find an XMesaBuffer by matching X display and colormap but NOT matching
 418  * the notThis buffer.
 419  */
 420 XMesaBuffer
 421 xmesa_find_buffer(Display *dpy, Colormap cmap, XMesaBuffer notThis)
 422 {
 423    XMesaBuffer b;
 424    for (b = XMesaBufferList; b; b = b->Next) {
 425       if (b->xm_visual->display == dpy &&
 426           b->cmap == cmap &&
 427           b != notThis) {
 428          return b;
 429       }
 430    }
 431    return NULL;
 432 }
 433
 434
 435 /**
 436  * Remove buffer from linked list, delete if no longer referenced.
 437  */
 438 static void
 439 xmesa_free_buffer(XMesaBuffer buffer)
 440 {
 441    XMesaBuffer prev = NULL, b;
 442
 443    for (b = XMesaBufferList; b; b = b->Next) {
 444       if (b == buffer) {
 445          /* unlink buffer from list */
 446          if (prev)
 447             prev->Next = buffer->Next;
 448          else
 449             XMesaBufferList = buffer->Next;
 450
 451          /* Since the X window for the XMesaBuffer is going away, we don't
 452           * want to dereference this pointer in the future.
 453           */
 454          b->ws.drawable = 0;
 455
 456          /* XXX we should move the buffer to a delete-pending list and destroy
 457           * the buffer until it is no longer current.
 458           */
 459          xmesa_destroy_st_framebuffer(buffer->stfb);
 460
 461          free(buffer);
 462
 463          return;
 464       }
 465       /* continue search */
 466       prev = b;
 467    }
 468    /* buffer not found in XMesaBufferList */
 469    _mesa_problem(NULL,"xmesa_free_buffer() - buffer not found\n");
 470 }
 471
 472
 473
 474 /**********************************************************************/
 475 /*****                   Misc Private Functions                   *****/
 476 /**********************************************************************/
 477
 478
 479 /**
 480  * When a context is bound for the first time, we can finally finish
 481  * initializing the context's visual and buffer information.
 482  * \param v  the XMesaVisual to initialize
 483  * \param b  the XMesaBuffer to initialize (may be NULL)
 484  * \param rgb_flag  TRUE = RGBA mode, FALSE = color index mode
 485  * \param window  the window/pixmap we're rendering into
 486  * \param cmap  the colormap associated with the window/pixmap
 487  * \return GL_TRUE=success, GL_FALSE=failure
 488  */
 489 static GLboolean
 490 initialize_visual_and_buffer(XMesaVisual v, XMesaBuffer b,
 491                              GLboolean rgb_flag, Drawable window,
 492                              Colormap cmap)
 493 {
 494    ASSERT(!b || b->xm_visual == v);
 495
 496    /* Save true bits/pixel */
 497    v->BitsPerPixel = bits_per_pixel(v);
 498    assert(v->BitsPerPixel > 0);
 499
 500    if (rgb_flag == GL_FALSE) {
 501       /* COLOR-INDEXED WINDOW: not supported*/
 502       return GL_FALSE;
 503    }
 504    else {
 505       /* RGB WINDOW:
 506        * We support RGB rendering into almost any kind of visual.
 507        */
 508       const int xclass = v->mesa_visual.visualType;
 509       if (xclass != GLX_TRUE_COLOR && xclass == !GLX_DIRECT_COLOR) {
 510          _mesa_warning(NULL,
 511             "XMesa: RGB mode rendering not supported in given visual.\n");
 512          return GL_FALSE;
 513       }
 514       v->mesa_visual.indexBits = 0;
 515
 516       if (v->BitsPerPixel == 32) {
 517          /* We use XImages for all front/back buffers.  If an X Window or
 518           * X Pixmap is 32bpp, there's no guarantee that the alpha channel
 519           * will be preserved.  For XImages we're in luck.
 520           */
 521          v->mesa_visual.alphaBits = 8;
 522       }
 523    }
 524
 525    /*
 526     * If MESA_INFO env var is set print out some debugging info
 527     * which can help Brian figure out what's going on when a user
 528     * reports bugs.
 529     */
 530    if (_mesa_getenv("MESA_INFO")) {
 531       printf("X/Mesa visual = %p\n", (void *) v);
 532       printf("X/Mesa level = %d\n", v->mesa_visual.level);
 533       printf("X/Mesa depth = %d\n", v->visinfo->depth);
 534       printf("X/Mesa bits per pixel = %d\n", v->BitsPerPixel);
 535    }
 536
 537    return GL_TRUE;
 538 }
 539
 540
 541
 542 #define NUM_VISUAL_TYPES   6
 543
 544 /**
 545  * Convert an X visual type to a GLX visual type.
 546  *
 547  * \param visualType X visual type (i.e., \c TrueColor, \c StaticGray, etc.)
 548  *        to be converted.
 549  * \return If \c visualType is a valid X visual type, a GLX visual type will
 550  *         be returned.  Otherwise \c GLX_NONE will be returned.
 551  *
 552  * \note
 553  * This code was lifted directly from lib/GL/glx/glcontextmodes.c in the
 554  * DRI CVS tree.
 555  */
 556 static GLint
 557 xmesa_convert_from_x_visual_type( int visualType )
 558 {
 559     static const int glx_visual_types[ NUM_VISUAL_TYPES ] = {
 560         GLX_STATIC_GRAY,  GLX_GRAY_SCALE,
 561         GLX_STATIC_COLOR, GLX_PSEUDO_COLOR,
 562         GLX_TRUE_COLOR,   GLX_DIRECT_COLOR
 563     };
 564
 565     return ( (unsigned) visualType < NUM_VISUAL_TYPES )
 566         ? glx_visual_types[ visualType ] : GLX_NONE;
 567 }
 568
 569
 570 /**********************************************************************/
 571 /*****                       Public Functions                     *****/
 572 /**********************************************************************/
 573
 574
 575 /*
 576  * Create a new X/Mesa visual.
 577  * Input:  display - X11 display
 578  *         visinfo - an XVisualInfo pointer
 579  *         rgb_flag - GL_TRUE = RGB mode,
 580  *                    GL_FALSE = color index mode
 581  *         alpha_flag - alpha buffer requested?
 582  *         db_flag - GL_TRUE = double-buffered,
 583  *                   GL_FALSE = single buffered
 584  *         stereo_flag - stereo visual?
 585  *         ximage_flag - GL_TRUE = use an XImage for back buffer,
 586  *                       GL_FALSE = use an off-screen pixmap for back buffer
 587  *         depth_size - requested bits/depth values, or zero
 588  *         stencil_size - requested bits/stencil values, or zero
 589  *         accum_red_size - requested bits/red accum values, or zero
 590  *         accum_green_size - requested bits/green accum values, or zero
 591  *         accum_blue_size - requested bits/blue accum values, or zero
 592  *         accum_alpha_size - requested bits/alpha accum values, or zero
 593  *         num_samples - number of samples/pixel if multisampling, or zero
 594  *         level - visual level, usually 0
 595  *         visualCaveat - ala the GLX extension, usually GLX_NONE
 596  * Return;  a new XMesaVisual or 0 if error.
 597  */
 598 PUBLIC
 599 XMesaVisual XMesaCreateVisual( Display *display,
 600                                XVisualInfo * visinfo,
 601                                GLboolean rgb_flag,
 602                                GLboolean alpha_flag,
 603                                GLboolean db_flag,
 604                                GLboolean stereo_flag,
 605                                GLboolean ximage_flag,
 606                                GLint depth_size,
 607                                GLint stencil_size,
 608                                GLint accum_red_size,
 609                                GLint accum_green_size,
 610                                GLint accum_blue_size,
 611                                GLint accum_alpha_size,
 612                                GLint num_samples,
 613                                GLint level,
 614                                GLint visualCaveat )
 615 {
 616    XMesaDisplay xmdpy = xmesa_init_display(display);
 617    XMesaVisual v;
 618    GLint red_bits, green_bits, blue_bits, alpha_bits;
 619
 620    if (!xmdpy)
 621       return NULL;
 622
 623    /* For debugging only */
 624    if (_mesa_getenv("MESA_XSYNC")) {
 625       /* This makes debugging X easier.
 626        * In your debugger, set a breakpoint on _XError to stop when an
 627        * X protocol error is generated.
 628        */
 629       XSynchronize( display, 1 );
 630    }
 631
 632    v = (XMesaVisual) CALLOC_STRUCT(xmesa_visual);
 633    if (!v) {
 634       return NULL;
 635    }
 636
 637    v->display = display;
 638
 639    /* Save a copy of the XVisualInfo struct because the user may Xfree()
 640     * the struct but we may need some of the information contained in it
 641     * at a later time.
 642     */
 643    v->visinfo = (XVisualInfo *) MALLOC(sizeof(*visinfo));
 644    if (!v->visinfo) {
 645       free(v);
 646       return NULL;
 647    }
 648    memcpy(v->visinfo, visinfo, sizeof(*visinfo));
 649
 650    v->ximage_flag = ximage_flag;
 651
 652    v->mesa_visual.redMask = visinfo->red_mask;
 653    v->mesa_visual.greenMask = visinfo->green_mask;
 654    v->mesa_visual.blueMask = visinfo->blue_mask;
 655    v->mesa_visual.visualID = visinfo->visualid;
 656    v->mesa_visual.screen = visinfo->screen;
 657
 658 #if !(defined(__cplusplus) || defined(c_plusplus))
 659    v->mesa_visual.visualType = xmesa_convert_from_x_visual_type(visinfo->class);
 660 #else
 661    v->mesa_visual.visualType = xmesa_convert_from_x_visual_type(visinfo->c_class);
 662 #endif
 663
 664    v->mesa_visual.visualRating = visualCaveat;
 665
 666    if (alpha_flag)
 667       v->mesa_visual.alphaBits = 8;
 668
 669    (void) initialize_visual_and_buffer( v, NULL, rgb_flag, 0, 0 );
 670
 671    {
 672       const int xclass = v->mesa_visual.visualType;
 673       if (xclass == GLX_TRUE_COLOR || xclass == GLX_DIRECT_COLOR) {
 674          red_bits   = _mesa_bitcount(GET_REDMASK(v));
 675          green_bits = _mesa_bitcount(GET_GREENMASK(v));
 676          blue_bits  = _mesa_bitcount(GET_BLUEMASK(v));
 677       }
 678       else {
 679          /* this is an approximation */
 680          int depth;
 681          depth = v->visinfo->depth;
 682          red_bits = depth / 3;
 683          depth -= red_bits;
 684          green_bits = depth / 2;
 685          depth -= green_bits;
 686          blue_bits = depth;
 687          alpha_bits = 0;
 688          assert( red_bits + green_bits + blue_bits == v->visinfo->depth );
 689       }
 690       alpha_bits = v->mesa_visual.alphaBits;
 691    }
 692
 693    _mesa_initialize_visual( &v->mesa_visual,
 694                             db_flag, stereo_flag,
 695                             red_bits, green_bits,
 696                             blue_bits, alpha_bits,
 697                             depth_size,
 698                             stencil_size,
 699                             accum_red_size, accum_green_size,
 700                             accum_blue_size, accum_alpha_size,
 701                             0 );
 702
 703    v->stvis.buffer_mask = ST_ATTACHMENT_FRONT_LEFT_MASK;
 704    if (db_flag)
 705       v->stvis.buffer_mask |= ST_ATTACHMENT_BACK_LEFT_MASK;
 706    if (stereo_flag) {
 707       v->stvis.buffer_mask |= ST_ATTACHMENT_FRONT_RIGHT_MASK;
 708       if (db_flag)
 709          v->stvis.buffer_mask |= ST_ATTACHMENT_BACK_RIGHT_MASK;
 710    }
 711
 712    v->stvis.color_format = choose_pixel_format(v);
 713    v->stvis.depth_stencil_format =
 714       choose_depth_stencil_format(xmdpy, depth_size, stencil_size);
 715
 716    v->stvis.accum_format = (accum_red_size +
 717          accum_green_size + accum_blue_size + accum_alpha_size) ?
 718       PIPE_FORMAT_R16G16B16A16_SNORM : PIPE_FORMAT_NONE;
 719
 720    v->stvis.samples = num_samples;
 721    v->stvis.render_buffer = ST_ATTACHMENT_INVALID;
 722
 723    /* XXX minor hack */
 724    v->mesa_visual.level = level;
 725    return v;
 726 }
 727
 728
 729 PUBLIC
 730 void XMesaDestroyVisual( XMesaVisual v )
 731 {
 732    free(v->visinfo);
 733    free(v);
 734 }
 735
 736
 737 /**
 738  * Do per-display initializations.
 739  */
 740 void
 741 xmesa_init( Display *display )
 742 {
 743    xmesa_init_display(display);
 744 }
 745
 746
 747 /**
 748  * Create a new XMesaContext.
 749  * \param v  the XMesaVisual
 750  * \param share_list  another XMesaContext with which to share display
 751  *                    lists or NULL if no sharing is wanted.
 752  * \return an XMesaContext or NULL if error.
 753  */
 754 PUBLIC
 755 XMesaContext XMesaCreateContext( XMesaVisual v, XMesaContext share_list )
 756 {
 757    XMesaDisplay xmdpy = xmesa_init_display(v->display);
 758    XMesaContext c;
 759
 760    if (!xmdpy)
 761       return NULL;
 762
 763    /* Note: the XMesaContext contains a Mesa GLcontext struct (inheritance) */
 764    c = (XMesaContext) CALLOC_STRUCT(xmesa_context);
 765    if (!c)
 766       return NULL;
 767
 768    c->xm_visual = v;
 769    c->xm_buffer = NULL;   /* set later by XMesaMakeCurrent */
 770    c->xm_read_buffer = NULL;
 771
 772    c->st = stapi->create_context(stapi, xmdpy->smapi,
 773          &v->stvis, (share_list) ? share_list->st : NULL);
 774    if (c->st == NULL)
 775       goto fail;
 776
 777    c->st->st_manager_private = (void *) c;
 778
 779    return c;
 780
 781 fail:
 782    if (c->st)
 783       c->st->destroy(c->st);
 784
 785    free(c);
 786    return NULL;
 787 }
 788
 789
 790
 791 PUBLIC
 792 void XMesaDestroyContext( XMesaContext c )
 793 {
 794    c->st->destroy(c->st);
 795
 796    /* FIXME: We should destroy the screen here, but if we do so, surfaces may
 797     * outlive it, causing segfaults
 798    struct pipe_screen *screen = c->st->pipe->screen;
 799    screen->destroy(screen);
 800    */
 801
 802    free(c);
 803 }
 804
 805
 806
 807 /**
 808  * Private function for creating an XMesaBuffer which corresponds to an
 809  * X window or pixmap.
 810  * \param v  the window's XMesaVisual
 811  * \param w  the window we're wrapping
 812  * \return  new XMesaBuffer or NULL if error
 813  */
 814 PUBLIC XMesaBuffer
 815 XMesaCreateWindowBuffer(XMesaVisual v, Window w)
 816 {
 817    XWindowAttributes attr;
 818    XMesaBuffer b;
 819    Colormap cmap;
 820    int depth;
 821
 822    assert(v);
 823    assert(w);
 824
 825    /* Check that window depth matches visual depth */
 826    XGetWindowAttributes( v->display, w, &attr );
 827    depth = attr.depth;
 828    if (v->visinfo->depth != depth) {
 829       _mesa_warning(NULL, "XMesaCreateWindowBuffer: depth mismatch between visual (%d) and window (%d)!\n",
 830                     v->visinfo->depth, depth);
 831       return NULL;
 832    }
 833
 834    /* Find colormap */
 835    if (attr.colormap) {
 836       cmap = attr.colormap;
 837    }
 838    else {
 839       _mesa_warning(NULL, "Window %u has no colormap!\n", (unsigned int) w);
 840       /* this is weird, a window w/out a colormap!? */
 841       /* OK, let's just allocate a new one and hope for the best */
 842       cmap = XCreateColormap(v->display, w, attr.visual, AllocNone);
 843    }
 844
 845    b = create_xmesa_buffer((Drawable) w, WINDOW, v, cmap);
 846    if (!b)
 847       return NULL;
 848
 849    if (!initialize_visual_and_buffer( v, b, v->mesa_visual.rgbMode,
 850                                       (Drawable) w, cmap )) {
 851       xmesa_free_buffer(b);
 852       return NULL;
 853    }
 854
 855    return b;
 856 }
 857
 858
 859
 860 /**
 861  * Create a new XMesaBuffer from an X pixmap.
 862  *
 863  * \param v    the XMesaVisual
 864  * \param p    the pixmap
 865  * \param cmap the colormap, may be 0 if using a \c GLX_TRUE_COLOR or
 866  *             \c GLX_DIRECT_COLOR visual for the pixmap
 867  * \returns new XMesaBuffer or NULL if error
 868  */
 869 PUBLIC XMesaBuffer
 870 XMesaCreatePixmapBuffer(XMesaVisual v, Pixmap p, Colormap cmap)
 871 {
 872    XMesaBuffer b;
 873
 874    assert(v);
 875
 876    b = create_xmesa_buffer((Drawable) p, PIXMAP, v, cmap);
 877    if (!b)
 878       return NULL;
 879
 880    if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
 881                                      (Drawable) p, cmap)) {
 882       xmesa_free_buffer(b);
 883       return NULL;
 884    }
 885
 886    return b;
 887 }
 888
 889
 890 /**
 891  * For GLX_EXT_texture_from_pixmap
 892  */
 893 XMesaBuffer
 894 XMesaCreatePixmapTextureBuffer(XMesaVisual v, Pixmap p,
 895                                Colormap cmap,
 896                                int format, int target, int mipmap)
 897 {
 898    GET_CURRENT_CONTEXT(ctx);
 899    XMesaBuffer b;
 900
 901    assert(v);
 902
 903    b = create_xmesa_buffer((Drawable) p, PIXMAP, v, cmap);
 904    if (!b)
 905       return NULL;
 906
 907    /* get pixmap size */
 908    xmesa_get_window_size(v->display, b, &b->width, &b->height);
 909
 910    if (target == 0) {
 911       /* examine dims */
 912       if (ctx->Extensions.ARB_texture_non_power_of_two) {
 913          target = GLX_TEXTURE_2D_EXT;
 914       }
 915       else if (   _mesa_bitcount(b->width)  == 1
 916                && _mesa_bitcount(b->height) == 1) {
 917          /* power of two size */
 918          if (b->height == 1) {
 919             target = GLX_TEXTURE_1D_EXT;
 920          }
 921          else {
 922             target = GLX_TEXTURE_2D_EXT;
 923          }
 924       }
 925       else if (ctx->Extensions.NV_texture_rectangle) {
 926          target = GLX_TEXTURE_RECTANGLE_EXT;
 927       }
 928       else {
 929          /* non power of two textures not supported */
 930          XMesaDestroyBuffer(b);
 931          return 0;
 932       }
 933    }
 934
 935    b->TextureTarget = target;
 936    b->TextureFormat = format;
 937    b->TextureMipmap = mipmap;
 938
 939    if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
 940                                      (Drawable) p, cmap)) {
 941       xmesa_free_buffer(b);
 942       return NULL;
 943    }
 944
 945    return b;
 946 }
 947
 948
 949
 950 XMesaBuffer
 951 XMesaCreatePBuffer(XMesaVisual v, Colormap cmap,
 952                    unsigned int width, unsigned int height)
 953 {
 954    Window root;
 955    Drawable drawable;  /* X Pixmap Drawable */
 956    XMesaBuffer b;
 957
 958    /* allocate pixmap for front buffer */
 959    root = RootWindow( v->display, v->visinfo->screen );
 960    drawable = XCreatePixmap(v->display, root, width, height,
 961                             v->visinfo->depth);
 962    if (!drawable)
 963       return NULL;
 964
 965    b = create_xmesa_buffer(drawable, PBUFFER, v, cmap);
 966    if (!b)
 967       return NULL;
 968
 969    if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
 970                                      drawable, cmap)) {
 971       xmesa_free_buffer(b);
 972       return NULL;
 973    }
 974
 975    return b;
 976 }
 977
 978
 979
 980 /*
 981  * Deallocate an XMesaBuffer structure and all related info.
 982  */
 983 PUBLIC void
 984 XMesaDestroyBuffer(XMesaBuffer b)
 985 {
 986    xmesa_free_buffer(b);
 987 }
 988
 989
 990 /**
 991  * Query the current drawable size and notify the binding context.
 992  */
 993 void
 994 xmesa_check_buffer_size(XMesaBuffer b)
 995 {
 996    XMesaContext xmctx = XMesaGetCurrentContext();
 997
 998    if (b->type == PBUFFER)
 999       return;
1000
1001    xmesa_get_window_size(b->xm_visual->display, b, &b->width, &b->height);
1002    if (xmctx && xmctx->xm_buffer == b)
1003       xmctx->st->notify_invalid_framebuffer(xmctx->st, b->stfb);
1004 }
1005
1006
1007 /*
1008  * Bind buffer b to context c and make c the current rendering context.
1009  */
1010 PUBLIC
1011 GLboolean XMesaMakeCurrent2( XMesaContext c, XMesaBuffer drawBuffer,
1012                              XMesaBuffer readBuffer )
1013 {
1014    XMesaContext old_ctx = XMesaGetCurrentContext();
1015
1016    if (old_ctx && old_ctx != c) {
1017       XMesaFlush(old_ctx);
1018       old_ctx->xm_buffer = NULL;
1019       old_ctx->xm_read_buffer = NULL;
1020    }
1021
1022    if (c) {
1023       if (!drawBuffer || !readBuffer)
1024          return GL_FALSE;  /* must specify buffers! */
1025
1026       if (c == old_ctx &&
1027           c->xm_buffer == drawBuffer &&
1028           c->xm_read_buffer == readBuffer)
1029          return GL_TRUE;
1030
1031       xmesa_check_buffer_size(drawBuffer);
1032       if (readBuffer != drawBuffer)
1033          xmesa_check_buffer_size(readBuffer);
1034
1035       c->xm_buffer = drawBuffer;
1036       c->xm_read_buffer = readBuffer;
1037
1038       stapi->make_current(stapi, c->st, drawBuffer->stfb, readBuffer->stfb);
1039
1040       /* Solution to Stephane Rehel's problem with glXReleaseBuffersMESA(): */
1041       drawBuffer->wasCurrent = GL_TRUE;
1042    }
1043    else {
1044       /* Detach */
1045       stapi->make_current(stapi, NULL, NULL, NULL);
1046
1047    }
1048    return GL_TRUE;
1049 }
1050
1051
1052 /*
1053  * Unbind the context c from its buffer.
1054  */
1055 GLboolean XMesaUnbindContext( XMesaContext c )
1056 {
1057    /* A no-op for XFree86 integration purposes */
1058    return GL_TRUE;
1059 }
1060
1061
1062 XMesaContext XMesaGetCurrentContext( void )
1063 {
1064    struct st_context_iface *st = stapi->get_current(stapi);
1065    return (XMesaContext) (st) ? st->st_manager_private : NULL;
1066 }
1067
1068
1069
1070 /**
1071  * Swap front and back color buffers and have winsys display front buffer.
1072  * If there's no front color buffer no swap actually occurs.
1073  */
1074 PUBLIC
1075 void XMesaSwapBuffers( XMesaBuffer b )
1076 {
1077    XMesaContext xmctx = XMesaGetCurrentContext();
1078
1079    if (xmctx && xmctx->xm_buffer == b) {
1080       xmctx->st->flush( xmctx->st,
1081             PIPE_FLUSH_RENDER_CACHE |
1082             PIPE_FLUSH_SWAPBUFFERS |
1083             PIPE_FLUSH_FRAME,
1084             NULL);
1085    }
1086
1087    xmesa_swap_st_framebuffer(b->stfb);
1088 }
1089
1090
1091
1092 /*
1093  * Copy sub-region of back buffer to front buffer
1094  */
1095 void XMesaCopySubBuffer( XMesaBuffer b, int x, int y, int width, int height )
1096 {
1097    xmesa_copy_st_framebuffer(b->stfb,
1098          ST_ATTACHMENT_BACK_LEFT, ST_ATTACHMENT_FRONT_LEFT,
1099          x, y, width, height);
1100 }
1101
1102
1103
1104 void XMesaFlush( XMesaContext c )
1105 {
1106    if (c && c->xm_visual->display) {
1107       XMesaDisplay xmdpy = xmesa_init_display(c->xm_visual->display);
1108       struct pipe_fence_handle *fence = NULL;
1109
1110       c->st->flush(c->st, PIPE_FLUSH_RENDER_CACHE | PIPE_FLUSH_FRAME, &fence);
1111       if (fence) {
1112          xmdpy->screen->fence_finish(xmdpy->screen, fence, 0);
1113          xmdpy->screen->fence_reference(xmdpy->screen, &fence, NULL);
1114       }
1115       XSync( c->xm_visual->display, False );
1116    }
1117 }
1118
1119
1120
1121
1122
1123 XMesaBuffer XMesaFindBuffer( Display *dpy, Drawable d )
1124 {
1125    XMesaBuffer b;
1126    for (b = XMesaBufferList; b; b = b->Next) {
1127       if (b->ws.drawable == d && b->xm_visual->display == dpy) {
1128          return b;
1129       }
1130    }
1131    return NULL;
1132 }
1133
1134
1135 /**
1136  * Free/destroy all XMesaBuffers associated with given display.
1137  */
1138 void xmesa_destroy_buffers_on_display(Display *dpy)
1139 {
1140    XMesaBuffer b, next;
1141    for (b = XMesaBufferList; b; b = next) {
1142       next = b->Next;
1143       if (b->xm_visual->display == dpy) {
1144          xmesa_free_buffer(b);
1145       }
1146    }
1147 }
1148
1149
1150 /*
1151  * Look for XMesaBuffers whose X window has been destroyed.
1152  * Deallocate any such XMesaBuffers.
1153  */
1154 void XMesaGarbageCollect( void )
1155 {
1156    XMesaBuffer b, next;
1157    for (b=XMesaBufferList; b; b=next) {
1158       next = b->Next;
1159       if (b->xm_visual &&
1160           b->xm_visual->display &&
1161           b->ws.drawable &&
1162           b->type == WINDOW) {
1163          XSync(b->xm_visual->display, False);
1164          if (!window_exists( b->xm_visual->display, b->ws.drawable )) {
1165             /* found a dead window, free the ancillary info */
1166             XMesaDestroyBuffer( b );
1167          }
1168       }
1169    }
1170 }
1171
1172
1173
1174
1175 PUBLIC void
1176 XMesaBindTexImage(Display *dpy, XMesaBuffer drawable, int buffer,
1177                   const int *attrib_list)
1178 {
1179 }
1180
1181
1182
1183 PUBLIC void
1184 XMesaReleaseTexImage(Display *dpy, XMesaBuffer drawable, int buffer)
1185 {
1186 }
1187
1188
1189 void
1190 XMesaCopyContext(XMesaContext src, XMesaContext dst, unsigned long mask)
1191 {
1192    if (dst->st->copy)
1193       dst->st->copy(dst->st, src->st, mask);
1194 }