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
  82 /*
  83  * XXX replace this with a linked list, or better yet, try to attach the
  84  * gallium/mesa extra bits to the X Display object with XAddExtension().
  85  */
  86 #define MAX_DISPLAYS 10
  87 static struct xmesa_display Displays[MAX_DISPLAYS];
  88 static int NumDisplays = 0;
  89
  90 static int
  91 xmesa_get_param(struct st_manager *smapi,
  92                 enum st_manager_param param)
  93 {
  94    return 0;
  95 }
  96
  97 static XMesaDisplay
  98 xmesa_init_display( Display *display )
  99 {
 100    pipe_static_mutex(init_mutex);
 101    XMesaDisplay xmdpy;
 102    int i;
 103
 104    pipe_mutex_lock(init_mutex);
 105
 106    /* Look for XMesaDisplay which corresponds to 'display' */
 107    for (i = 0; i < NumDisplays; i++) {
 108       if (Displays[i].display == display) {
 109          /* Found it */
 110          pipe_mutex_unlock(init_mutex);
 111          return &Displays[i];
 112       }
 113    }
 114
 115    /* Create new XMesaDisplay */
 116
 117    assert(NumDisplays < MAX_DISPLAYS);
 118    xmdpy = &Displays[NumDisplays];
 119    NumDisplays++;
 120
 121    if (!xmdpy->display && display) {
 122       xmdpy->display = display;
 123       xmdpy->screen = driver.create_pipe_screen(display);
 124       xmdpy->smapi = CALLOC_STRUCT(st_manager);
 125       if (xmdpy->smapi) {
 126          xmdpy->smapi->screen = xmdpy->screen;
 127          xmdpy->smapi->get_param = xmesa_get_param;
 128       }
 129
 130       if (xmdpy->screen && xmdpy->smapi) {
 131          pipe_mutex_init(xmdpy->mutex);
 132       }
 133       else {
 134          if (xmdpy->screen) {
 135             xmdpy->screen->destroy(xmdpy->screen);
 136             xmdpy->screen = NULL;
 137          }
 138          if (xmdpy->smapi) {
 139             FREE(xmdpy->smapi);
 140             xmdpy->smapi = NULL;
 141          }
 142
 143          xmdpy->display = NULL;
 144       }
 145    }
 146    if (!xmdpy->display || xmdpy->display != display)
 147       xmdpy = NULL;
 148
 149    pipe_mutex_unlock(init_mutex);
 150
 151    return xmdpy;
 152 }
 153
 154 /**********************************************************************/
 155 /*****                     X Utility Functions                    *****/
 156 /**********************************************************************/
 157
 158
 159 /**
 160  * Return the host's byte order as LSBFirst or MSBFirst ala X.
 161  */
 162 static int host_byte_order( void )
 163 {
 164    int i = 1;
 165    char *cptr = (char *) &i;
 166    return (*cptr==1) ? LSBFirst : MSBFirst;
 167 }
 168
 169
 170
 171
 172 /**
 173  * Return the true number of bits per pixel for XImages.
 174  * For example, if we request a 24-bit deep visual we may actually need/get
 175  * 32bpp XImages.  This function returns the appropriate bpp.
 176  * Input:  dpy - the X display
 177  *         visinfo - desribes the visual to be used for XImages
 178  * Return:  true number of bits per pixel for XImages
 179  */
 180 static int
 181 bits_per_pixel( XMesaVisual xmv )
 182 {
 183    Display *dpy = xmv->display;
 184    XVisualInfo * visinfo = xmv->visinfo;
 185    XImage *img;
 186    int bitsPerPixel;
 187    /* Create a temporary XImage */
 188    img = XCreateImage( dpy, visinfo->visual, visinfo->depth,
 189                        ZPixmap, 0,           /*format, offset*/
 190                        (char*) MALLOC(8),    /*data*/
 191                        1, 1,                 /*width, height*/
 192                        32,                   /*bitmap_pad*/
 193                        0                     /*bytes_per_line*/
 194                      );
 195    assert(img);
 196    /* grab the bits/pixel value */
 197    bitsPerPixel = img->bits_per_pixel;
 198    /* free the XImage */
 199    free( img->data );
 200    img->data = NULL;
 201    XDestroyImage( img );
 202    return bitsPerPixel;
 203 }
 204
 205
 206
 207 /*
 208  * Determine if a given X window ID is valid (window exists).
 209  * Do this by calling XGetWindowAttributes() for the window and
 210  * checking if we catch an X error.
 211  * Input:  dpy - the display
 212  *         win - the window to check for existance
 213  * Return:  GL_TRUE - window exists
 214  *          GL_FALSE - window doesn't exist
 215  */
 216 static GLboolean WindowExistsFlag;
 217
 218 static int window_exists_err_handler( Display* dpy, XErrorEvent* xerr )
 219 {
 220    (void) dpy;
 221    if (xerr->error_code == BadWindow) {
 222       WindowExistsFlag = GL_FALSE;
 223    }
 224    return 0;
 225 }
 226
 227 static GLboolean window_exists( Display *dpy, Window win )
 228 {
 229    XWindowAttributes wa;
 230    int (*old_handler)( Display*, XErrorEvent* );
 231    WindowExistsFlag = GL_TRUE;
 232    old_handler = XSetErrorHandler(window_exists_err_handler);
 233    XGetWindowAttributes( dpy, win, &wa ); /* dummy request */
 234    XSetErrorHandler(old_handler);
 235    return WindowExistsFlag;
 236 }
 237
 238 static Status
 239 get_drawable_size( Display *dpy, Drawable d, uint *width, uint *height )
 240 {
 241    Window root;
 242    Status stat;
 243    int xpos, ypos;
 244    unsigned int w, h, bw, depth;
 245    stat = XGetGeometry(dpy, d, &root, &xpos, &ypos, &w, &h, &bw, &depth);
 246    *width = w;
 247    *height = h;
 248    return stat;
 249 }
 250
 251
 252 /**
 253  * Return the size of the window (or pixmap) that corresponds to the
 254  * given XMesaBuffer.
 255  * \param width  returns width in pixels
 256  * \param height  returns height in pixels
 257  */
 258 void
 259 xmesa_get_window_size(Display *dpy, XMesaBuffer b,
 260                       GLuint *width, GLuint *height)
 261 {
 262    XMesaDisplay xmdpy = xmesa_init_display(dpy);
 263    Status stat;
 264
 265    pipe_mutex_lock(xmdpy->mutex);
 266    XSync(b->xm_visual->display, 0); /* added for Chromium */
 267    stat = get_drawable_size(dpy, b->ws.drawable, width, height);
 268    pipe_mutex_unlock(xmdpy->mutex);
 269
 270    if (!stat) {
 271       /* probably querying a window that's recently been destroyed */
 272       _mesa_warning(NULL, "XGetGeometry failed!\n");
 273       *width = *height = 1;
 274    }
 275 }
 276
 277 #define GET_REDMASK(__v)        __v->mesa_visual.redMask
 278 #define GET_GREENMASK(__v)      __v->mesa_visual.greenMask
 279 #define GET_BLUEMASK(__v)       __v->mesa_visual.blueMask
 280
 281
 282 /**
 283  * Choose the pixel format for the given visual.
 284  * This will tell the gallium driver how to pack pixel data into
 285  * drawing surfaces.
 286  */
 287 static GLuint
 288 choose_pixel_format(XMesaVisual v)
 289 {
 290    boolean native_byte_order = (host_byte_order() ==
 291                                 ImageByteOrder(v->display));
 292
 293    if (   GET_REDMASK(v)   == 0x0000ff
 294        && GET_GREENMASK(v) == 0x00ff00
 295        && GET_BLUEMASK(v)  == 0xff0000
 296        && v->BitsPerPixel == 32) {
 297       if (native_byte_order) {
 298          /* no byteswapping needed */
 299          return PIPE_FORMAT_R8G8B8A8_UNORM;
 300       }
 301       else {
 302          return PIPE_FORMAT_A8B8G8R8_UNORM;
 303       }
 304    }
 305    else if (   GET_REDMASK(v)   == 0xff0000
 306             && GET_GREENMASK(v) == 0x00ff00
 307             && GET_BLUEMASK(v)  == 0x0000ff
 308             && v->BitsPerPixel == 32) {
 309       if (native_byte_order) {
 310          /* no byteswapping needed */
 311          return PIPE_FORMAT_B8G8R8A8_UNORM;
 312       }
 313       else {
 314          return PIPE_FORMAT_A8R8G8B8_UNORM;
 315       }
 316    }
 317    else if (   GET_REDMASK(v)   == 0x0000ff00
 318             && GET_GREENMASK(v) == 0x00ff0000
 319             && GET_BLUEMASK(v)  == 0xff000000
 320             && v->BitsPerPixel == 32) {
 321       if (native_byte_order) {
 322          /* no byteswapping needed */
 323          return PIPE_FORMAT_A8R8G8B8_UNORM;
 324       }
 325       else {
 326          return PIPE_FORMAT_B8G8R8A8_UNORM;
 327       }
 328    }
 329    else if (   GET_REDMASK(v)   == 0xf800
 330             && GET_GREENMASK(v) == 0x07e0
 331             && GET_BLUEMASK(v)  == 0x001f
 332             && native_byte_order
 333             && v->BitsPerPixel == 16) {
 334       /* 5-6-5 RGB */
 335       return PIPE_FORMAT_B5G6R5_UNORM;
 336    }
 337
 338    return PIPE_FORMAT_NONE;
 339 }
 340
 341
 342 /**
 343  * Choose a depth/stencil format that satisfies the given depth and
 344  * stencil sizes.
 345  */
 346 static enum pipe_format
 347 choose_depth_stencil_format(XMesaDisplay xmdpy, int depth, int stencil)
 348 {
 349    const enum pipe_texture_target target = PIPE_TEXTURE_2D;
 350    const unsigned tex_usage = PIPE_BIND_DEPTH_STENCIL;
 351    const unsigned geom_flags = (PIPE_TEXTURE_GEOM_NON_SQUARE |
 352                                 PIPE_TEXTURE_GEOM_NON_POWER_OF_TWO);
 353    const unsigned sample_count = 0;
 354    enum pipe_format formats[8], fmt;
 355    int count, i;
 356
 357    count = 0;
 358
 359    if (depth <= 16 && stencil == 0) {
 360       formats[count++] = PIPE_FORMAT_Z16_UNORM;
 361    }
 362    if (depth <= 24 && stencil == 0) {
 363       formats[count++] = PIPE_FORMAT_X8Z24_UNORM;
 364       formats[count++] = PIPE_FORMAT_Z24X8_UNORM;
 365    }
 366    if (depth <= 24 && stencil <= 8) {
 367       formats[count++] = PIPE_FORMAT_S8_USCALED_Z24_UNORM;
 368       formats[count++] = PIPE_FORMAT_Z24_UNORM_S8_USCALED;
 369    }
 370    if (depth <= 32 && stencil == 0) {
 371       formats[count++] = PIPE_FORMAT_Z32_UNORM;
 372    }
 373
 374    fmt = PIPE_FORMAT_NONE;
 375    for (i = 0; i < count; i++) {
 376       if (xmdpy->screen->is_format_supported(xmdpy->screen, formats[i],
 377                                              target, sample_count,
 378                                              tex_usage, geom_flags)) {
 379          fmt = formats[i];
 380          break;
 381       }
 382    }
 383
 384    return fmt;
 385 }
 386
 387
 388
 389 /**********************************************************************/
 390 /*****                Linked list of XMesaBuffers                 *****/
 391 /**********************************************************************/
 392
 393 static XMesaBuffer XMesaBufferList = NULL;
 394
 395
 396 /**
 397  * Allocate a new XMesaBuffer object which corresponds to the given drawable.
 398  * Note that XMesaBuffer is derived from GLframebuffer.
 399  * The new XMesaBuffer will not have any size (Width=Height=0).
 400  *
 401  * \param d  the corresponding X drawable (window or pixmap)
 402  * \param type  either WINDOW, PIXMAP or PBUFFER, describing d
 403  * \param vis  the buffer's visual
 404  * \param cmap  the window's colormap, if known.
 405  * \return new XMesaBuffer or NULL if any problem
 406  */
 407 static XMesaBuffer
 408 create_xmesa_buffer(Drawable d, BufferType type,
 409                     XMesaVisual vis, Colormap cmap)
 410 {
 411    XMesaDisplay xmdpy = xmesa_init_display(vis->display);
 412    XMesaBuffer b;
 413    uint width, height;
 414
 415    ASSERT(type == WINDOW || type == PIXMAP || type == PBUFFER);
 416
 417    if (!xmdpy)
 418       return NULL;
 419
 420    b = (XMesaBuffer) CALLOC_STRUCT(xmesa_buffer);
 421    if (!b)
 422       return NULL;
 423
 424    b->ws.drawable = d;
 425    b->ws.visual = vis->visinfo->visual;
 426    b->ws.depth = vis->visinfo->depth;
 427
 428    b->xm_visual = vis;
 429    b->type = type;
 430    b->cmap = cmap;
 431
 432    get_drawable_size(vis->display, d, &width, &height);
 433
 434    /*
 435     * Create framebuffer, but we'll plug in our own renderbuffers below.
 436     */
 437    b->stfb = xmesa_create_st_framebuffer(xmdpy, b);
 438
 439    /* GLX_EXT_texture_from_pixmap */
 440    b->TextureTarget = 0;
 441    b->TextureFormat = GLX_TEXTURE_FORMAT_NONE_EXT;
 442    b->TextureMipmap = 0;
 443
 444    /* insert buffer into linked list */
 445    b->Next = XMesaBufferList;
 446    XMesaBufferList = b;
 447
 448    return b;
 449 }
 450
 451
 452 /**
 453  * Find an XMesaBuffer by matching X display and colormap but NOT matching
 454  * the notThis buffer.
 455  */
 456 XMesaBuffer
 457 xmesa_find_buffer(Display *dpy, Colormap cmap, XMesaBuffer notThis)
 458 {
 459    XMesaBuffer b;
 460    for (b = XMesaBufferList; b; b = b->Next) {
 461       if (b->xm_visual->display == dpy &&
 462           b->cmap == cmap &&
 463           b != notThis) {
 464          return b;
 465       }
 466    }
 467    return NULL;
 468 }
 469
 470
 471 /**
 472  * Remove buffer from linked list, delete if no longer referenced.
 473  */
 474 static void
 475 xmesa_free_buffer(XMesaBuffer buffer)
 476 {
 477    XMesaBuffer prev = NULL, b;
 478
 479    for (b = XMesaBufferList; b; b = b->Next) {
 480       if (b == buffer) {
 481          /* unlink buffer from list */
 482          if (prev)
 483             prev->Next = buffer->Next;
 484          else
 485             XMesaBufferList = buffer->Next;
 486
 487          /* Since the X window for the XMesaBuffer is going away, we don't
 488           * want to dereference this pointer in the future.
 489           */
 490          b->ws.drawable = 0;
 491
 492          /* XXX we should move the buffer to a delete-pending list and destroy
 493           * the buffer until it is no longer current.
 494           */
 495          xmesa_destroy_st_framebuffer(buffer->stfb);
 496
 497          free(buffer);
 498
 499          return;
 500       }
 501       /* continue search */
 502       prev = b;
 503    }
 504    /* buffer not found in XMesaBufferList */
 505    _mesa_problem(NULL,"xmesa_free_buffer() - buffer not found\n");
 506 }
 507
 508
 509
 510 /**********************************************************************/
 511 /*****                   Misc Private Functions                   *****/
 512 /**********************************************************************/
 513
 514
 515 /**
 516  * When a context is bound for the first time, we can finally finish
 517  * initializing the context's visual and buffer information.
 518  * \param v  the XMesaVisual to initialize
 519  * \param b  the XMesaBuffer to initialize (may be NULL)
 520  * \param rgb_flag  TRUE = RGBA mode, FALSE = color index mode
 521  * \param window  the window/pixmap we're rendering into
 522  * \param cmap  the colormap associated with the window/pixmap
 523  * \return GL_TRUE=success, GL_FALSE=failure
 524  */
 525 static GLboolean
 526 initialize_visual_and_buffer(XMesaVisual v, XMesaBuffer b,
 527                              GLboolean rgb_flag, Drawable window,
 528                              Colormap cmap)
 529 {
 530    ASSERT(!b || b->xm_visual == v);
 531
 532    /* Save true bits/pixel */
 533    v->BitsPerPixel = bits_per_pixel(v);
 534    assert(v->BitsPerPixel > 0);
 535
 536    if (rgb_flag == GL_FALSE) {
 537       /* COLOR-INDEXED WINDOW: not supported*/
 538       return GL_FALSE;
 539    }
 540    else {
 541       /* RGB WINDOW:
 542        * We support RGB rendering into almost any kind of visual.
 543        */
 544       const int xclass = v->mesa_visual.visualType;
 545       if (xclass != GLX_TRUE_COLOR && xclass == !GLX_DIRECT_COLOR) {
 546          _mesa_warning(NULL,
 547             "XMesa: RGB mode rendering not supported in given visual.\n");
 548          return GL_FALSE;
 549       }
 550       v->mesa_visual.indexBits = 0;
 551
 552       if (v->BitsPerPixel == 32) {
 553          /* We use XImages for all front/back buffers.  If an X Window or
 554           * X Pixmap is 32bpp, there's no guarantee that the alpha channel
 555           * will be preserved.  For XImages we're in luck.
 556           */
 557          v->mesa_visual.alphaBits = 8;
 558       }
 559    }
 560
 561    /*
 562     * If MESA_INFO env var is set print out some debugging info
 563     * which can help Brian figure out what's going on when a user
 564     * reports bugs.
 565     */
 566    if (_mesa_getenv("MESA_INFO")) {
 567       printf("X/Mesa visual = %p\n", (void *) v);
 568       printf("X/Mesa level = %d\n", v->mesa_visual.level);
 569       printf("X/Mesa depth = %d\n", v->visinfo->depth);
 570       printf("X/Mesa bits per pixel = %d\n", v->BitsPerPixel);
 571    }
 572
 573    return GL_TRUE;
 574 }
 575
 576
 577
 578 #define NUM_VISUAL_TYPES   6
 579
 580 /**
 581  * Convert an X visual type to a GLX visual type.
 582  *
 583  * \param visualType X visual type (i.e., \c TrueColor, \c StaticGray, etc.)
 584  *        to be converted.
 585  * \return If \c visualType is a valid X visual type, a GLX visual type will
 586  *         be returned.  Otherwise \c GLX_NONE will be returned.
 587  *
 588  * \note
 589  * This code was lifted directly from lib/GL/glx/glcontextmodes.c in the
 590  * DRI CVS tree.
 591  */
 592 static GLint
 593 xmesa_convert_from_x_visual_type( int visualType )
 594 {
 595     static const int glx_visual_types[ NUM_VISUAL_TYPES ] = {
 596         GLX_STATIC_GRAY,  GLX_GRAY_SCALE,
 597         GLX_STATIC_COLOR, GLX_PSEUDO_COLOR,
 598         GLX_TRUE_COLOR,   GLX_DIRECT_COLOR
 599     };
 600
 601     return ( (unsigned) visualType < NUM_VISUAL_TYPES )
 602         ? glx_visual_types[ visualType ] : GLX_NONE;
 603 }
 604
 605
 606 /**********************************************************************/
 607 /*****                       Public Functions                     *****/
 608 /**********************************************************************/
 609
 610
 611 /*
 612  * Create a new X/Mesa visual.
 613  * Input:  display - X11 display
 614  *         visinfo - an XVisualInfo pointer
 615  *         rgb_flag - GL_TRUE = RGB mode,
 616  *                    GL_FALSE = color index mode
 617  *         alpha_flag - alpha buffer requested?
 618  *         db_flag - GL_TRUE = double-buffered,
 619  *                   GL_FALSE = single buffered
 620  *         stereo_flag - stereo visual?
 621  *         ximage_flag - GL_TRUE = use an XImage for back buffer,
 622  *                       GL_FALSE = use an off-screen pixmap for back buffer
 623  *         depth_size - requested bits/depth values, or zero
 624  *         stencil_size - requested bits/stencil values, or zero
 625  *         accum_red_size - requested bits/red accum values, or zero
 626  *         accum_green_size - requested bits/green accum values, or zero
 627  *         accum_blue_size - requested bits/blue accum values, or zero
 628  *         accum_alpha_size - requested bits/alpha accum values, or zero
 629  *         num_samples - number of samples/pixel if multisampling, or zero
 630  *         level - visual level, usually 0
 631  *         visualCaveat - ala the GLX extension, usually GLX_NONE
 632  * Return;  a new XMesaVisual or 0 if error.
 633  */
 634 PUBLIC
 635 XMesaVisual XMesaCreateVisual( Display *display,
 636                                XVisualInfo * visinfo,
 637                                GLboolean rgb_flag,
 638                                GLboolean alpha_flag,
 639                                GLboolean db_flag,
 640                                GLboolean stereo_flag,
 641                                GLboolean ximage_flag,
 642                                GLint depth_size,
 643                                GLint stencil_size,
 644                                GLint accum_red_size,
 645                                GLint accum_green_size,
 646                                GLint accum_blue_size,
 647                                GLint accum_alpha_size,
 648                                GLint num_samples,
 649                                GLint level,
 650                                GLint visualCaveat )
 651 {
 652    XMesaDisplay xmdpy = xmesa_init_display(display);
 653    XMesaVisual v;
 654    GLint red_bits, green_bits, blue_bits, alpha_bits;
 655
 656    if (!xmdpy)
 657       return NULL;
 658
 659    /* For debugging only */
 660    if (_mesa_getenv("MESA_XSYNC")) {
 661       /* This makes debugging X easier.
 662        * In your debugger, set a breakpoint on _XError to stop when an
 663        * X protocol error is generated.
 664        */
 665       XSynchronize( display, 1 );
 666    }
 667
 668    v = (XMesaVisual) CALLOC_STRUCT(xmesa_visual);
 669    if (!v) {
 670       return NULL;
 671    }
 672
 673    v->display = display;
 674
 675    /* Save a copy of the XVisualInfo struct because the user may Xfree()
 676     * the struct but we may need some of the information contained in it
 677     * at a later time.
 678     */
 679    v->visinfo = (XVisualInfo *) MALLOC(sizeof(*visinfo));
 680    if (!v->visinfo) {
 681       free(v);
 682       return NULL;
 683    }
 684    memcpy(v->visinfo, visinfo, sizeof(*visinfo));
 685
 686    v->ximage_flag = ximage_flag;
 687
 688    v->mesa_visual.redMask = visinfo->red_mask;
 689    v->mesa_visual.greenMask = visinfo->green_mask;
 690    v->mesa_visual.blueMask = visinfo->blue_mask;
 691    v->mesa_visual.visualID = visinfo->visualid;
 692    v->mesa_visual.screen = visinfo->screen;
 693
 694 #if !(defined(__cplusplus) || defined(c_plusplus))
 695    v->mesa_visual.visualType = xmesa_convert_from_x_visual_type(visinfo->class);
 696 #else
 697    v->mesa_visual.visualType = xmesa_convert_from_x_visual_type(visinfo->c_class);
 698 #endif
 699
 700    v->mesa_visual.visualRating = visualCaveat;
 701
 702    if (alpha_flag)
 703       v->mesa_visual.alphaBits = 8;
 704
 705    (void) initialize_visual_and_buffer( v, NULL, rgb_flag, 0, 0 );
 706
 707    {
 708       const int xclass = v->mesa_visual.visualType;
 709       if (xclass == GLX_TRUE_COLOR || xclass == GLX_DIRECT_COLOR) {
 710          red_bits   = _mesa_bitcount(GET_REDMASK(v));
 711          green_bits = _mesa_bitcount(GET_GREENMASK(v));
 712          blue_bits  = _mesa_bitcount(GET_BLUEMASK(v));
 713       }
 714       else {
 715          /* this is an approximation */
 716          int depth;
 717          depth = v->visinfo->depth;
 718          red_bits = depth / 3;
 719          depth -= red_bits;
 720          green_bits = depth / 2;
 721          depth -= green_bits;
 722          blue_bits = depth;
 723          alpha_bits = 0;
 724          assert( red_bits + green_bits + blue_bits == v->visinfo->depth );
 725       }
 726       alpha_bits = v->mesa_visual.alphaBits;
 727    }
 728
 729    _mesa_initialize_visual( &v->mesa_visual,
 730                             db_flag, stereo_flag,
 731                             red_bits, green_bits,
 732                             blue_bits, alpha_bits,
 733                             depth_size,
 734                             stencil_size,
 735                             accum_red_size, accum_green_size,
 736                             accum_blue_size, accum_alpha_size,
 737                             0 );
 738
 739    v->stvis.buffer_mask = ST_ATTACHMENT_FRONT_LEFT_MASK;
 740    if (db_flag)
 741       v->stvis.buffer_mask |= ST_ATTACHMENT_BACK_LEFT_MASK;
 742    if (stereo_flag) {
 743       v->stvis.buffer_mask |= ST_ATTACHMENT_FRONT_RIGHT_MASK;
 744       if (db_flag)
 745          v->stvis.buffer_mask |= ST_ATTACHMENT_BACK_RIGHT_MASK;
 746    }
 747
 748    v->stvis.color_format = choose_pixel_format(v);
 749    if (v->stvis.color_format == PIPE_FORMAT_NONE) {
 750       FREE(v->visinfo);
 751       FREE(v);
 752       return NULL;
 753    }
 754
 755    v->stvis.depth_stencil_format =
 756       choose_depth_stencil_format(xmdpy, depth_size, stencil_size);
 757
 758    v->stvis.accum_format = (accum_red_size +
 759          accum_green_size + accum_blue_size + accum_alpha_size) ?
 760       PIPE_FORMAT_R16G16B16A16_SNORM : PIPE_FORMAT_NONE;
 761
 762    v->stvis.samples = num_samples;
 763    v->stvis.render_buffer = ST_ATTACHMENT_INVALID;
 764
 765    /* XXX minor hack */
 766    v->mesa_visual.level = level;
 767    return v;
 768 }
 769
 770
 771 PUBLIC
 772 void XMesaDestroyVisual( XMesaVisual v )
 773 {
 774    free(v->visinfo);
 775    free(v);
 776 }
 777
 778
 779 /**
 780  * Do per-display initializations.
 781  */
 782 void
 783 xmesa_init( Display *display )
 784 {
 785    xmesa_init_display(display);
 786 }
 787
 788
 789 /**
 790  * Create a new XMesaContext.
 791  * \param v  the XMesaVisual
 792  * \param share_list  another XMesaContext with which to share display
 793  *                    lists or NULL if no sharing is wanted.
 794  * \return an XMesaContext or NULL if error.
 795  */
 796 PUBLIC
 797 XMesaContext XMesaCreateContext( XMesaVisual v, XMesaContext share_list )
 798 {
 799    XMesaDisplay xmdpy = xmesa_init_display(v->display);
 800    XMesaContext c;
 801
 802    if (!xmdpy)
 803       return NULL;
 804
 805    /* Note: the XMesaContext contains a Mesa GLcontext struct (inheritance) */
 806    c = (XMesaContext) CALLOC_STRUCT(xmesa_context);
 807    if (!c)
 808       return NULL;
 809
 810    c->xm_visual = v;
 811    c->xm_buffer = NULL;   /* set later by XMesaMakeCurrent */
 812    c->xm_read_buffer = NULL;
 813
 814    c->st = stapi->create_context(stapi, xmdpy->smapi,
 815          &v->stvis, (share_list) ? share_list->st : NULL);
 816    if (c->st == NULL)
 817       goto fail;
 818
 819    c->st->st_manager_private = (void *) c;
 820
 821    return c;
 822
 823 fail:
 824    if (c->st)
 825       c->st->destroy(c->st);
 826
 827    free(c);
 828    return NULL;
 829 }
 830
 831
 832
 833 PUBLIC
 834 void XMesaDestroyContext( XMesaContext c )
 835 {
 836    c->st->destroy(c->st);
 837
 838    /* FIXME: We should destroy the screen here, but if we do so, surfaces may
 839     * outlive it, causing segfaults
 840    struct pipe_screen *screen = c->st->pipe->screen;
 841    screen->destroy(screen);
 842    */
 843
 844    free(c);
 845 }
 846
 847
 848
 849 /**
 850  * Private function for creating an XMesaBuffer which corresponds to an
 851  * X window or pixmap.
 852  * \param v  the window's XMesaVisual
 853  * \param w  the window we're wrapping
 854  * \return  new XMesaBuffer or NULL if error
 855  */
 856 PUBLIC XMesaBuffer
 857 XMesaCreateWindowBuffer(XMesaVisual v, Window w)
 858 {
 859    XWindowAttributes attr;
 860    XMesaBuffer b;
 861    Colormap cmap;
 862    int depth;
 863
 864    assert(v);
 865    assert(w);
 866
 867    /* Check that window depth matches visual depth */
 868    XGetWindowAttributes( v->display, w, &attr );
 869    depth = attr.depth;
 870    if (v->visinfo->depth != depth) {
 871       _mesa_warning(NULL, "XMesaCreateWindowBuffer: depth mismatch between visual (%d) and window (%d)!\n",
 872                     v->visinfo->depth, depth);
 873       return NULL;
 874    }
 875
 876    /* Find colormap */
 877    if (attr.colormap) {
 878       cmap = attr.colormap;
 879    }
 880    else {
 881       _mesa_warning(NULL, "Window %u has no colormap!\n", (unsigned int) w);
 882       /* this is weird, a window w/out a colormap!? */
 883       /* OK, let's just allocate a new one and hope for the best */
 884       cmap = XCreateColormap(v->display, w, attr.visual, AllocNone);
 885    }
 886
 887    b = create_xmesa_buffer((Drawable) w, WINDOW, v, cmap);
 888    if (!b)
 889       return NULL;
 890
 891    if (!initialize_visual_and_buffer( v, b, v->mesa_visual.rgbMode,
 892                                       (Drawable) w, cmap )) {
 893       xmesa_free_buffer(b);
 894       return NULL;
 895    }
 896
 897    return b;
 898 }
 899
 900
 901
 902 /**
 903  * Create a new XMesaBuffer from an X pixmap.
 904  *
 905  * \param v    the XMesaVisual
 906  * \param p    the pixmap
 907  * \param cmap the colormap, may be 0 if using a \c GLX_TRUE_COLOR or
 908  *             \c GLX_DIRECT_COLOR visual for the pixmap
 909  * \returns new XMesaBuffer or NULL if error
 910  */
 911 PUBLIC XMesaBuffer
 912 XMesaCreatePixmapBuffer(XMesaVisual v, Pixmap p, Colormap cmap)
 913 {
 914    XMesaBuffer b;
 915
 916    assert(v);
 917
 918    b = create_xmesa_buffer((Drawable) p, PIXMAP, v, cmap);
 919    if (!b)
 920       return NULL;
 921
 922    if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
 923                                      (Drawable) p, cmap)) {
 924       xmesa_free_buffer(b);
 925       return NULL;
 926    }
 927
 928    return b;
 929 }
 930
 931
 932 /**
 933  * For GLX_EXT_texture_from_pixmap
 934  */
 935 XMesaBuffer
 936 XMesaCreatePixmapTextureBuffer(XMesaVisual v, Pixmap p,
 937                                Colormap cmap,
 938                                int format, int target, int mipmap)
 939 {
 940    GET_CURRENT_CONTEXT(ctx);
 941    XMesaBuffer b;
 942
 943    assert(v);
 944
 945    b = create_xmesa_buffer((Drawable) p, PIXMAP, v, cmap);
 946    if (!b)
 947       return NULL;
 948
 949    /* get pixmap size */
 950    xmesa_get_window_size(v->display, b, &b->width, &b->height);
 951
 952    if (target == 0) {
 953       /* examine dims */
 954       if (ctx->Extensions.ARB_texture_non_power_of_two) {
 955          target = GLX_TEXTURE_2D_EXT;
 956       }
 957       else if (   _mesa_bitcount(b->width)  == 1
 958                && _mesa_bitcount(b->height) == 1) {
 959          /* power of two size */
 960          if (b->height == 1) {
 961             target = GLX_TEXTURE_1D_EXT;
 962          }
 963          else {
 964             target = GLX_TEXTURE_2D_EXT;
 965          }
 966       }
 967       else if (ctx->Extensions.NV_texture_rectangle) {
 968          target = GLX_TEXTURE_RECTANGLE_EXT;
 969       }
 970       else {
 971          /* non power of two textures not supported */
 972          XMesaDestroyBuffer(b);
 973          return 0;
 974       }
 975    }
 976
 977    b->TextureTarget = target;
 978    b->TextureFormat = format;
 979    b->TextureMipmap = mipmap;
 980
 981    if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
 982                                      (Drawable) p, cmap)) {
 983       xmesa_free_buffer(b);
 984       return NULL;
 985    }
 986
 987    return b;
 988 }
 989
 990
 991
 992 XMesaBuffer
 993 XMesaCreatePBuffer(XMesaVisual v, Colormap cmap,
 994                    unsigned int width, unsigned int height)
 995 {
 996    Window root;
 997    Drawable drawable;  /* X Pixmap Drawable */
 998    XMesaBuffer b;
 999
1000    /* allocate pixmap for front buffer */
1001    root = RootWindow( v->display, v->visinfo->screen );
1002    drawable = XCreatePixmap(v->display, root, width, height,
1003                             v->visinfo->depth);
1004    if (!drawable)
1005       return NULL;
1006
1007    b = create_xmesa_buffer(drawable, PBUFFER, v, cmap);
1008    if (!b)
1009       return NULL;
1010
1011    if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
1012                                      drawable, cmap)) {
1013       xmesa_free_buffer(b);
1014       return NULL;
1015    }
1016
1017    return b;
1018 }
1019
1020
1021
1022 /*
1023  * Deallocate an XMesaBuffer structure and all related info.
1024  */
1025 PUBLIC void
1026 XMesaDestroyBuffer(XMesaBuffer b)
1027 {
1028    xmesa_free_buffer(b);
1029 }
1030
1031
1032 /**
1033  * Query the current drawable size and notify the binding context.
1034  */
1035 void
1036 xmesa_check_buffer_size(XMesaBuffer b)
1037 {
1038    XMesaContext xmctx = XMesaGetCurrentContext();
1039
1040    if (b->type == PBUFFER)
1041       return;
1042
1043    xmesa_get_window_size(b->xm_visual->display, b, &b->width, &b->height);
1044    if (xmctx && xmctx->xm_buffer == b)
1045       xmctx->st->notify_invalid_framebuffer(xmctx->st, b->stfb);
1046 }
1047
1048
1049 /*
1050  * Bind buffer b to context c and make c the current rendering context.
1051  */
1052 PUBLIC
1053 GLboolean XMesaMakeCurrent2( XMesaContext c, XMesaBuffer drawBuffer,
1054                              XMesaBuffer readBuffer )
1055 {
1056    XMesaContext old_ctx = XMesaGetCurrentContext();
1057
1058    if (old_ctx && old_ctx != c) {
1059       XMesaFlush(old_ctx);
1060       old_ctx->xm_buffer = NULL;
1061       old_ctx->xm_read_buffer = NULL;
1062    }
1063
1064    if (c) {
1065       if (!drawBuffer || !readBuffer)
1066          return GL_FALSE;  /* must specify buffers! */
1067
1068       if (c == old_ctx &&
1069           c->xm_buffer == drawBuffer &&
1070           c->xm_read_buffer == readBuffer)
1071          return GL_TRUE;
1072
1073       xmesa_check_buffer_size(drawBuffer);
1074       if (readBuffer != drawBuffer)
1075          xmesa_check_buffer_size(readBuffer);
1076
1077       c->xm_buffer = drawBuffer;
1078       c->xm_read_buffer = readBuffer;
1079
1080       stapi->make_current(stapi, c->st, drawBuffer->stfb, readBuffer->stfb);
1081
1082       /* Solution to Stephane Rehel's problem with glXReleaseBuffersMESA(): */
1083       drawBuffer->wasCurrent = GL_TRUE;
1084    }
1085    else {
1086       /* Detach */
1087       stapi->make_current(stapi, NULL, NULL, NULL);
1088
1089    }
1090    return GL_TRUE;
1091 }
1092
1093
1094 /*
1095  * Unbind the context c from its buffer.
1096  */
1097 GLboolean XMesaUnbindContext( XMesaContext c )
1098 {
1099    /* A no-op for XFree86 integration purposes */
1100    return GL_TRUE;
1101 }
1102
1103
1104 XMesaContext XMesaGetCurrentContext( void )
1105 {
1106    struct st_context_iface *st = stapi->get_current(stapi);
1107    return (XMesaContext) (st) ? st->st_manager_private : NULL;
1108 }
1109
1110
1111
1112 /**
1113  * Swap front and back color buffers and have winsys display front buffer.
1114  * If there's no front color buffer no swap actually occurs.
1115  */
1116 PUBLIC
1117 void XMesaSwapBuffers( XMesaBuffer b )
1118 {
1119    XMesaContext xmctx = XMesaGetCurrentContext();
1120
1121    if (xmctx && xmctx->xm_buffer == b) {
1122       xmctx->st->flush( xmctx->st,
1123             PIPE_FLUSH_RENDER_CACHE |
1124             PIPE_FLUSH_SWAPBUFFERS |
1125             PIPE_FLUSH_FRAME,
1126             NULL);
1127    }
1128
1129    xmesa_swap_st_framebuffer(b->stfb);
1130 }
1131
1132
1133
1134 /*
1135  * Copy sub-region of back buffer to front buffer
1136  */
1137 void XMesaCopySubBuffer( XMesaBuffer b, int x, int y, int width, int height )
1138 {
1139    xmesa_copy_st_framebuffer(b->stfb,
1140          ST_ATTACHMENT_BACK_LEFT, ST_ATTACHMENT_FRONT_LEFT,
1141          x, y, width, height);
1142 }
1143
1144
1145
1146 void XMesaFlush( XMesaContext c )
1147 {
1148    if (c && c->xm_visual->display) {
1149       XMesaDisplay xmdpy = xmesa_init_display(c->xm_visual->display);
1150       struct pipe_fence_handle *fence = NULL;
1151
1152       c->st->flush(c->st, PIPE_FLUSH_RENDER_CACHE | PIPE_FLUSH_FRAME, &fence);
1153       if (fence) {
1154          xmdpy->screen->fence_finish(xmdpy->screen, fence, 0);
1155          xmdpy->screen->fence_reference(xmdpy->screen, &fence, NULL);
1156       }
1157       XFlush( c->xm_visual->display );
1158    }
1159 }
1160
1161
1162
1163
1164
1165 XMesaBuffer XMesaFindBuffer( Display *dpy, Drawable d )
1166 {
1167    XMesaBuffer b;
1168    for (b = XMesaBufferList; b; b = b->Next) {
1169       if (b->ws.drawable == d && b->xm_visual->display == dpy) {
1170          return b;
1171       }
1172    }
1173    return NULL;
1174 }
1175
1176
1177 /**
1178  * Free/destroy all XMesaBuffers associated with given display.
1179  */
1180 void xmesa_destroy_buffers_on_display(Display *dpy)
1181 {
1182    XMesaBuffer b, next;
1183    for (b = XMesaBufferList; b; b = next) {
1184       next = b->Next;
1185       if (b->xm_visual->display == dpy) {
1186          xmesa_free_buffer(b);
1187          /* delete head of list? */
1188          if (XMesaBufferList == b) {
1189             XMesaBufferList = next;
1190          }
1191       }
1192    }
1193 }
1194
1195
1196 /*
1197  * Look for XMesaBuffers whose X window has been destroyed.
1198  * Deallocate any such XMesaBuffers.
1199  */
1200 void XMesaGarbageCollect( void )
1201 {
1202    XMesaBuffer b, next;
1203    for (b=XMesaBufferList; b; b=next) {
1204       next = b->Next;
1205       if (b->xm_visual &&
1206           b->xm_visual->display &&
1207           b->ws.drawable &&
1208           b->type == WINDOW) {
1209          XSync(b->xm_visual->display, False);
1210          if (!window_exists( b->xm_visual->display, b->ws.drawable )) {
1211             /* found a dead window, free the ancillary info */
1212             XMesaDestroyBuffer( b );
1213          }
1214       }
1215    }
1216 }
1217
1218
1219
1220
1221 PUBLIC void
1222 XMesaBindTexImage(Display *dpy, XMesaBuffer drawable, int buffer,
1223                   const int *attrib_list)
1224 {
1225 }
1226
1227
1228
1229 PUBLIC void
1230 XMesaReleaseTexImage(Display *dpy, XMesaBuffer drawable, int buffer)
1231 {
1232 }
1233
1234
1235 void
1236 XMesaCopyContext(XMesaContext src, XMesaContext dst, unsigned long mask)
1237 {
1238    if (dst->st->copy)
1239       dst->st->copy(dst->st, src->st, mask);
1240 }