src/mesa/main/context.c

   1 /**
   2  * \file context.c
   3  * Mesa context/visual/framebuffer management functions.
   4  * \author Brian Paul
   5  */
   6
   7 /*
   8  * Mesa 3-D graphics library
   9  * Version:  7.1
  10  *
  11  * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
  12  *
  13  * Permission is hereby granted, free of charge, to any person obtaining a
  14  * copy of this software and associated documentation files (the "Software"),
  15  * to deal in the Software without restriction, including without limitation
  16  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  17  * and/or sell copies of the Software, and to permit persons to whom the
  18  * Software is furnished to do so, subject to the following conditions:
  19  *
  20  * The above copyright notice and this permission notice shall be included
  21  * in all copies or substantial portions of the Software.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  24  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  25  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  26  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  27  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  28  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29  */
  30
  31
  32 /**
  33  * \mainpage Mesa Main Module
  34  *
  35  * \section MainIntroduction Introduction
  36  *
  37  * The Mesa Main module consists of all the files in the main/ directory.
  38  * Among the features of this module are:
  39  * <UL>
  40  * <LI> Structures to represent most GL state </LI>
  41  * <LI> State set/get functions </LI>
  42  * <LI> Display lists </LI>
  43  * <LI> Texture unit, object and image handling </LI>
  44  * <LI> Matrix and attribute stacks </LI>
  45  * </UL>
  46  *
  47  * Other modules are responsible for API dispatch, vertex transformation,
  48  * point/line/triangle setup, rasterization, vertex array caching,
  49  * vertex/fragment programs/shaders, etc.
  50  *
  51  *
  52  * \section AboutDoxygen About Doxygen
  53  *
  54  * If you're viewing this information as Doxygen-generated HTML you'll
  55  * see the documentation index at the top of this page.
  56  *
  57  * The first line lists the Mesa source code modules.
  58  * The second line lists the indexes available for viewing the documentation
  59  * for each module.
  60  *
  61  * Selecting the <b>Main page</b> link will display a summary of the module
  62  * (this page).
  63  *
  64  * Selecting <b>Data Structures</b> will list all C structures.
  65  *
  66  * Selecting the <b>File List</b> link will list all the source files in
  67  * the module.
  68  * Selecting a filename will show a list of all functions defined in that file.
  69  *
  70  * Selecting the <b>Data Fields</b> link will display a list of all
  71  * documented structure members.
  72  *
  73  * Selecting the <b>Globals</b> link will display a list
  74  * of all functions, structures, global variables and macros in the module.
  75  *
  76  */
  77
  78
  79 #include "glheader.h"
  80 #include "imports.h"
  81 #if FEATURE_accum
  82 #include "accum.h"
  83 #endif
  84 #include "api_exec.h"
  85 #include "arrayobj.h"
  86 #if FEATURE_attrib_stack
  87 #include "attrib.h"
  88 #endif
  89 #include "blend.h"
  90 #include "buffers.h"
  91 #include "bufferobj.h"
  92 #if FEATURE_colortable
  93 #include "colortab.h"
  94 #endif
  95 #include "context.h"
  96 #include "debug.h"
  97 #include "depth.h"
  98 #if FEATURE_dlist
  99 #include "dlist.h"
 100 #endif
 101 #if FEATURE_evaluators
 102 #include "eval.h"
 103 #endif
 104 #include "enums.h"
 105 #include "extensions.h"
 106 #include "fbobject.h"
 107 #if FEATURE_feedback
 108 #include "feedback.h"
 109 #endif
 110 #include "fog.h"
 111 #include "framebuffer.h"
 112 #include "get.h"
 113 #if FEATURE_histogram
 114 #include "histogram.h"
 115 #endif
 116 #include "hint.h"
 117 #include "hash.h"
 118 #include "light.h"
 119 #include "lines.h"
 120 #include "macros.h"
 121 #include "matrix.h"
 122 #include "multisample.h"
 123 #include "pixel.h"
 124 #include "pixelstore.h"
 125 #include "points.h"
 126 #include "polygon.h"
 127 #if FEATURE_ARB_occlusion_query
 128 #include "queryobj.h"
 129 #endif
 130 #if FEATURE_drawpix
 131 #include "rastpos.h"
 132 #endif
 133 #include "scissor.h"
 134 #include "simple_list.h"
 135 #include "state.h"
 136 #include "stencil.h"
 137 #include "texcompress.h"
 138 #include "teximage.h"
 139 #include "texobj.h"
 140 #include "texstate.h"
 141 #include "mtypes.h"
 142 #include "varray.h"
 143 #include "version.h"
 144 #include "vtxfmt.h"
 145 #include "glapi/glthread.h"
 146 #include "glapi/glapioffsets.h"
 147 #include "glapi/glapitable.h"
 148 #if FEATURE_NV_vertex_program || FEATURE_NV_fragment_program
 149 #include "shader/program.h"
 150 #endif
 151 #include "shader/shader_api.h"
 152 #if FEATURE_ATI_fragment_shader
 153 #include "shader/atifragshader.h"
 154 #endif
 155 #if _HAVE_FULL_GL
 156 #include "math/m_translate.h"
 157 #include "math/m_matrix.h"
 158 #include "math/m_xform.h"
 159 #include "math/mathmod.h"
 160 #endif
 161
 162 #ifdef USE_SPARC_ASM
 163 #include "sparc/sparc.h"
 164 #endif
 165
 166 #ifndef MESA_VERBOSE
 167 int MESA_VERBOSE = 0;
 168 #endif
 169
 170 #ifndef MESA_DEBUG_FLAGS
 171 int MESA_DEBUG_FLAGS = 0;
 172 #endif
 173
 174
 175 /* ubyte -> float conversion */
 176 GLfloat _mesa_ubyte_to_float_color_tab[256];
 177
 178
 179
 180 /**
 181  * Swap buffers notification callback.
 182  *
 183  * \param gc GL context.
 184  *
 185  * Called by window system just before swapping buffers.
 186  * We have to finish any pending rendering.
 187  */
 188 void
 189 _mesa_notifySwapBuffers(__GLcontext *gc)
 190 {
 191    FLUSH_VERTICES( gc, 0 );
 192 }
 193
 194
 195 /**********************************************************************/
 196 /** \name GL Visual allocation/destruction                            */
 197 /**********************************************************************/
 198 /*@{*/
 199
 200 /**
 201  * Allocates a GLvisual structure and initializes it via
 202  * _mesa_initialize_visual().
 203  *
 204  * \param rgbFlag GL_TRUE for RGB(A) mode, GL_FALSE for Color Index mode.
 205  * \param dbFlag double buffering
 206  * \param stereoFlag stereo buffer
 207  * \param depthBits requested bits per depth buffer value. Any value in [0, 32]
 208  * is acceptable but the actual depth type will be GLushort or GLuint as
 209  * needed.
 210  * \param stencilBits requested minimum bits per stencil buffer value
 211  * \param accumRedBits, accumGreenBits, accumBlueBits, accumAlphaBits number of bits per color component in accum buffer.
 212  * \param indexBits number of bits per pixel if \p rgbFlag is GL_FALSE
 213  * \param redBits number of bits per color component in frame buffer for RGB(A)
 214  * mode.  We always use 8 in core Mesa though.
 215  * \param greenBits same as above.
 216  * \param blueBits same as above.
 217  * \param alphaBits same as above.
 218  * \param numSamples not really used.
 219  *
 220  * \return pointer to new GLvisual or NULL if requested parameters can't be
 221  * met.
 222  *
 223  * \note Need to add params for level and numAuxBuffers (at least)
 224  */
 225 GLvisual *
 226 _mesa_create_visual( GLboolean rgbFlag,
 227                      GLboolean dbFlag,
 228                      GLboolean stereoFlag,
 229                      GLint redBits,
 230                      GLint greenBits,
 231                      GLint blueBits,
 232                      GLint alphaBits,
 233                      GLint indexBits,
 234                      GLint depthBits,
 235                      GLint stencilBits,
 236                      GLint accumRedBits,
 237                      GLint accumGreenBits,
 238                      GLint accumBlueBits,
 239                      GLint accumAlphaBits,
 240                      GLint numSamples )
 241 {
 242    GLvisual *vis = (GLvisual *) _mesa_calloc(sizeof(GLvisual));
 243    if (vis) {
 244       if (!_mesa_initialize_visual(vis, rgbFlag, dbFlag, stereoFlag,
 245                                    redBits, greenBits, blueBits, alphaBits,
 246                                    indexBits, depthBits, stencilBits,
 247                                    accumRedBits, accumGreenBits,
 248                                    accumBlueBits, accumAlphaBits,
 249                                    numSamples)) {
 250          _mesa_free(vis);
 251          return NULL;
 252       }
 253    }
 254    return vis;
 255 }
 256
 257 /**
 258  * Makes some sanity checks and fills in the fields of the
 259  * GLvisual object with the given parameters.  If the caller needs
 260  * to set additional fields, he should just probably init the whole GLvisual
 261  * object himself.
 262  * \return GL_TRUE on success, or GL_FALSE on failure.
 263  *
 264  * \sa _mesa_create_visual() above for the parameter description.
 265  */
 266 GLboolean
 267 _mesa_initialize_visual( GLvisual *vis,
 268                          GLboolean rgbFlag,
 269                          GLboolean dbFlag,
 270                          GLboolean stereoFlag,
 271                          GLint redBits,
 272                          GLint greenBits,
 273                          GLint blueBits,
 274                          GLint alphaBits,
 275                          GLint indexBits,
 276                          GLint depthBits,
 277                          GLint stencilBits,
 278                          GLint accumRedBits,
 279                          GLint accumGreenBits,
 280                          GLint accumBlueBits,
 281                          GLint accumAlphaBits,
 282                          GLint numSamples )
 283 {
 284    assert(vis);
 285
 286    if (depthBits < 0 || depthBits > 32) {
 287       return GL_FALSE;
 288    }
 289    if (stencilBits < 0 || stencilBits > STENCIL_BITS) {
 290       return GL_FALSE;
 291    }
 292    assert(accumRedBits >= 0);
 293    assert(accumGreenBits >= 0);
 294    assert(accumBlueBits >= 0);
 295    assert(accumAlphaBits >= 0);
 296
 297    vis->rgbMode          = rgbFlag;
 298    vis->doubleBufferMode = dbFlag;
 299    vis->stereoMode       = stereoFlag;
 300
 301    vis->redBits          = redBits;
 302    vis->greenBits        = greenBits;
 303    vis->blueBits         = blueBits;
 304    vis->alphaBits        = alphaBits;
 305    vis->rgbBits          = redBits + greenBits + blueBits;
 306
 307    vis->indexBits      = indexBits;
 308    vis->depthBits      = depthBits;
 309    vis->stencilBits    = stencilBits;
 310
 311    vis->accumRedBits   = accumRedBits;
 312    vis->accumGreenBits = accumGreenBits;
 313    vis->accumBlueBits  = accumBlueBits;
 314    vis->accumAlphaBits = accumAlphaBits;
 315
 316    vis->haveAccumBuffer   = accumRedBits > 0;
 317    vis->haveDepthBuffer   = depthBits > 0;
 318    vis->haveStencilBuffer = stencilBits > 0;
 319
 320    vis->numAuxBuffers = 0;
 321    vis->level = 0;
 322    vis->pixmapMode = 0;
 323    vis->sampleBuffers = numSamples > 0 ? 1 : 0;
 324    vis->samples = numSamples;
 325
 326    return GL_TRUE;
 327 }
 328
 329
 330 /**
 331  * Destroy a visual and free its memory.
 332  *
 333  * \param vis visual.
 334  *
 335  * Frees the visual structure.
 336  */
 337 void
 338 _mesa_destroy_visual( GLvisual *vis )
 339 {
 340    _mesa_free(vis);
 341 }
 342
 343 /*@}*/
 344
 345
 346 /**********************************************************************/
 347 /** \name Context allocation, initialization, destroying
 348  *
 349  * The purpose of the most initialization functions here is to provide the
 350  * default state values according to the OpenGL specification.
 351  */
 352 /**********************************************************************/
 353 /*@{*/
 354
 355 /**
 356  * One-time initialization mutex lock.
 357  *
 358  * \sa Used by one_time_init().
 359  */
 360 _glthread_DECLARE_STATIC_MUTEX(OneTimeLock);
 361
 362 /**
 363  * Calls all the various one-time-init functions in Mesa.
 364  *
 365  * While holding a global mutex lock, calls several initialization functions,
 366  * and sets the glapi callbacks if the \c MESA_DEBUG environment variable is
 367  * defined.
 368  *
 369  * \sa _math_init().
 370  */
 371 static void
 372 one_time_init( GLcontext *ctx )
 373 {
 374    static GLboolean alreadyCalled = GL_FALSE;
 375    (void) ctx;
 376    _glthread_LOCK_MUTEX(OneTimeLock);
 377    if (!alreadyCalled) {
 378       GLuint i;
 379
 380       /* do some implementation tests */
 381       assert( sizeof(GLbyte) == 1 );
 382       assert( sizeof(GLubyte) == 1 );
 383       assert( sizeof(GLshort) == 2 );
 384       assert( sizeof(GLushort) == 2 );
 385       assert( sizeof(GLint) == 4 );
 386       assert( sizeof(GLuint) == 4 );
 387
 388       _mesa_init_sqrt_table();
 389
 390 #if _HAVE_FULL_GL
 391       _math_init();
 392
 393       for (i = 0; i < 256; i++) {
 394          _mesa_ubyte_to_float_color_tab[i] = (float) i / 255.0F;
 395       }
 396 #endif
 397
 398 #ifdef USE_SPARC_ASM
 399       _mesa_init_sparc_glapi_relocs();
 400 #endif
 401       if (_mesa_getenv("MESA_DEBUG")) {
 402          _glapi_noop_enable_warnings(GL_TRUE);
 403          _glapi_set_warning_func( (_glapi_warning_func) _mesa_warning );
 404       }
 405       else {
 406          _glapi_noop_enable_warnings(GL_FALSE);
 407       }
 408
 409 #if defined(DEBUG) && defined(__DATE__) && defined(__TIME__)
 410       _mesa_debug(ctx, "Mesa %s DEBUG build %s %s\n",
 411                   MESA_VERSION_STRING, __DATE__, __TIME__);
 412 #endif
 413
 414       alreadyCalled = GL_TRUE;
 415    }
 416    _glthread_UNLOCK_MUTEX(OneTimeLock);
 417 }
 418
 419
 420 /**
 421  * Allocate and initialize a shared context state structure.
 422  * Initializes the display list, texture objects and vertex programs hash
 423  * tables, allocates the texture objects. If it runs out of memory, frees
 424  * everything already allocated before returning NULL.
 425  *
 426  * \return pointer to a gl_shared_state structure on success, or NULL on
 427  * failure.
 428  */
 429 static GLboolean
 430 alloc_shared_state( GLcontext *ctx )
 431 {
 432    struct gl_shared_state *ss = CALLOC_STRUCT(gl_shared_state);
 433    if (!ss)
 434       return GL_FALSE;
 435
 436    ctx->Shared = ss;
 437
 438    _glthread_INIT_MUTEX(ss->Mutex);
 439
 440    ss->DisplayList = _mesa_NewHashTable();
 441    ss->TexObjects = _mesa_NewHashTable();
 442    ss->Programs = _mesa_NewHashTable();
 443
 444 #if FEATURE_ARB_vertex_program
 445    ss->DefaultVertexProgram = (struct gl_vertex_program *)
 446       ctx->Driver.NewProgram(ctx, GL_VERTEX_PROGRAM_ARB, 0);
 447    if (!ss->DefaultVertexProgram)
 448       goto cleanup;
 449 #endif
 450 #if FEATURE_ARB_fragment_program
 451    ss->DefaultFragmentProgram = (struct gl_fragment_program *)
 452       ctx->Driver.NewProgram(ctx, GL_FRAGMENT_PROGRAM_ARB, 0);
 453    if (!ss->DefaultFragmentProgram)
 454       goto cleanup;
 455 #endif
 456 #if FEATURE_ATI_fragment_shader
 457    ss->ATIShaders = _mesa_NewHashTable();
 458    ss->DefaultFragmentShader = _mesa_new_ati_fragment_shader(ctx, 0);
 459    if (!ss->DefaultFragmentShader)
 460       goto cleanup;
 461 #endif
 462
 463 #if FEATURE_ARB_vertex_buffer_object || FEATURE_ARB_pixel_buffer_object
 464    ss->BufferObjects = _mesa_NewHashTable();
 465 #endif
 466
 467    ss->ArrayObjects = _mesa_NewHashTable();
 468
 469 #if FEATURE_ARB_shader_objects
 470    ss->ShaderObjects = _mesa_NewHashTable();
 471 #endif
 472
 473    ss->Default1D = (*ctx->Driver.NewTextureObject)(ctx, 0, GL_TEXTURE_1D);
 474    if (!ss->Default1D)
 475       goto cleanup;
 476
 477    ss->Default2D = (*ctx->Driver.NewTextureObject)(ctx, 0, GL_TEXTURE_2D);
 478    if (!ss->Default2D)
 479       goto cleanup;
 480
 481    ss->Default3D = (*ctx->Driver.NewTextureObject)(ctx, 0, GL_TEXTURE_3D);
 482    if (!ss->Default3D)
 483       goto cleanup;
 484
 485    ss->DefaultCubeMap = (*ctx->Driver.NewTextureObject)(ctx, 0, GL_TEXTURE_CUBE_MAP_ARB);
 486    if (!ss->DefaultCubeMap)
 487       goto cleanup;
 488
 489    ss->DefaultRect = (*ctx->Driver.NewTextureObject)(ctx, 0, GL_TEXTURE_RECTANGLE_NV);
 490    if (!ss->DefaultRect)
 491       goto cleanup;
 492
 493    ss->Default1DArray = (*ctx->Driver.NewTextureObject)(ctx, 0, GL_TEXTURE_1D_ARRAY_EXT);
 494    if (!ss->Default1DArray)
 495       goto cleanup;
 496
 497    ss->Default2DArray = (*ctx->Driver.NewTextureObject)(ctx, 0, GL_TEXTURE_2D_ARRAY_EXT);
 498    if (!ss->Default2DArray)
 499       goto cleanup;
 500
 501    /* sanity check */
 502    assert(ss->Default1D->RefCount == 1);
 503
 504    _glthread_INIT_MUTEX(ss->TexMutex);
 505    ss->TextureStateStamp = 0;
 506
 507 #if FEATURE_EXT_framebuffer_object
 508    ss->FrameBuffers = _mesa_NewHashTable();
 509    if (!ss->FrameBuffers)
 510       goto cleanup;
 511    ss->RenderBuffers = _mesa_NewHashTable();
 512    if (!ss->RenderBuffers)
 513       goto cleanup;
 514 #endif
 515
 516    return GL_TRUE;
 517
 518 cleanup:
 519    /* Ran out of memory at some point.  Free everything and return NULL */
 520    if (ss->DisplayList)
 521       _mesa_DeleteHashTable(ss->DisplayList);
 522    if (ss->TexObjects)
 523       _mesa_DeleteHashTable(ss->TexObjects);
 524    if (ss->Programs)
 525       _mesa_DeleteHashTable(ss->Programs);
 526 #if FEATURE_ARB_vertex_program
 527    _mesa_reference_vertprog(ctx, &ss->DefaultVertexProgram, NULL);
 528 #endif
 529 #if FEATURE_ARB_fragment_program
 530    _mesa_reference_fragprog(ctx, &ss->DefaultFragmentProgram, NULL);
 531 #endif
 532 #if FEATURE_ATI_fragment_shader
 533    if (ss->DefaultFragmentShader)
 534       _mesa_delete_ati_fragment_shader(ctx, ss->DefaultFragmentShader);
 535 #endif
 536 #if FEATURE_ARB_vertex_buffer_object || FEATURE_ARB_pixel_buffer_object
 537    if (ss->BufferObjects)
 538       _mesa_DeleteHashTable(ss->BufferObjects);
 539 #endif
 540
 541    if (ss->ArrayObjects)
 542       _mesa_DeleteHashTable (ss->ArrayObjects);
 543
 544 #if FEATURE_ARB_shader_objects
 545    if (ss->ShaderObjects)
 546       _mesa_DeleteHashTable (ss->ShaderObjects);
 547 #endif
 548
 549 #if FEATURE_EXT_framebuffer_object
 550    if (ss->FrameBuffers)
 551       _mesa_DeleteHashTable(ss->FrameBuffers);
 552    if (ss->RenderBuffers)
 553       _mesa_DeleteHashTable(ss->RenderBuffers);
 554 #endif
 555
 556    if (ss->Default1D)
 557       (*ctx->Driver.DeleteTexture)(ctx, ss->Default1D);
 558    if (ss->Default2D)
 559       (*ctx->Driver.DeleteTexture)(ctx, ss->Default2D);
 560    if (ss->Default3D)
 561       (*ctx->Driver.DeleteTexture)(ctx, ss->Default3D);
 562    if (ss->DefaultCubeMap)
 563       (*ctx->Driver.DeleteTexture)(ctx, ss->DefaultCubeMap);
 564    if (ss->DefaultRect)
 565       (*ctx->Driver.DeleteTexture)(ctx, ss->DefaultRect);
 566    if (ss->Default1DArray)
 567       (*ctx->Driver.DeleteTexture)(ctx, ss->Default1DArray);
 568    if (ss->Default2DArray)
 569       (*ctx->Driver.DeleteTexture)(ctx, ss->Default2DArray);
 570
 571    _mesa_free(ss);
 572
 573    return GL_FALSE;
 574 }
 575
 576
 577 /**
 578  * Callback for deleting a display list.  Called by _mesa_HashDeleteAll().
 579  */
 580 static void
 581 delete_displaylist_cb(GLuint id, void *data, void *userData)
 582 {
 583 #if FEATURE_dlist
 584    struct mesa_display_list *list = (struct mesa_display_list *) data;
 585    GLcontext *ctx = (GLcontext *) userData;
 586    _mesa_delete_list(ctx, list);
 587 #endif
 588 }
 589
 590 /**
 591  * Callback for deleting a texture object.  Called by _mesa_HashDeleteAll().
 592  */
 593 static void
 594 delete_texture_cb(GLuint id, void *data, void *userData)
 595 {
 596    struct gl_texture_object *texObj = (struct gl_texture_object *) data;
 597    GLcontext *ctx = (GLcontext *) userData;
 598    ctx->Driver.DeleteTexture(ctx, texObj);
 599 }
 600
 601 /**
 602  * Callback for deleting a program object.  Called by _mesa_HashDeleteAll().
 603  */
 604 static void
 605 delete_program_cb(GLuint id, void *data, void *userData)
 606 {
 607    struct gl_program *prog = (struct gl_program *) data;
 608    GLcontext *ctx = (GLcontext *) userData;
 609    ASSERT(prog->RefCount == 1); /* should only be referenced by hash table */
 610    prog->RefCount = 0;  /* now going away */
 611    ctx->Driver.DeleteProgram(ctx, prog);
 612 }
 613
 614 /**
 615  * Callback for deleting an ATI fragment shader object.
 616  * Called by _mesa_HashDeleteAll().
 617  */
 618 static void
 619 delete_fragshader_cb(GLuint id, void *data, void *userData)
 620 {
 621    struct ati_fragment_shader *shader = (struct ati_fragment_shader *) data;
 622    GLcontext *ctx = (GLcontext *) userData;
 623    _mesa_delete_ati_fragment_shader(ctx, shader);
 624 }
 625
 626 /**
 627  * Callback for deleting a buffer object.  Called by _mesa_HashDeleteAll().
 628  */
 629 static void
 630 delete_bufferobj_cb(GLuint id, void *data, void *userData)
 631 {
 632    struct gl_buffer_object *bufObj = (struct gl_buffer_object *) data;
 633    GLcontext *ctx = (GLcontext *) userData;
 634    ctx->Driver.DeleteBuffer(ctx, bufObj);
 635 }
 636
 637 /**
 638  * Callback for deleting an array object.  Called by _mesa_HashDeleteAll().
 639  */
 640 static void
 641 delete_arrayobj_cb(GLuint id, void *data, void *userData)
 642 {
 643    struct gl_array_object *arrayObj = (struct gl_array_object *) data;
 644    GLcontext *ctx = (GLcontext *) userData;
 645    _mesa_delete_array_object(ctx, arrayObj);
 646 }
 647
 648 /**
 649  * Callback for freeing shader program data. Call it before delete_shader_cb
 650  * to avoid memory access error.
 651  */
 652 static void
 653 free_shader_program_data_cb(GLuint id, void *data, void *userData)
 654 {
 655    GLcontext *ctx = (GLcontext *) userData;
 656    struct gl_shader_program *shProg = (struct gl_shader_program *) data;
 657
 658    if (shProg->Type == GL_SHADER_PROGRAM_MESA) {
 659        _mesa_free_shader_program_data(ctx, shProg);
 660    }
 661 }
 662
 663 /**
 664  * Callback for deleting shader and shader programs objects.
 665  * Called by _mesa_HashDeleteAll().
 666  */
 667 static void
 668 delete_shader_cb(GLuint id, void *data, void *userData)
 669 {
 670    GLcontext *ctx = (GLcontext *) userData;
 671    struct gl_shader *sh = (struct gl_shader *) data;
 672    if (sh->Type == GL_FRAGMENT_SHADER || sh->Type == GL_VERTEX_SHADER) {
 673       _mesa_free_shader(ctx, sh);
 674    }
 675    else {
 676       struct gl_shader_program *shProg = (struct gl_shader_program *) data;
 677       ASSERT(shProg->Type == GL_SHADER_PROGRAM_MESA);
 678       _mesa_free_shader_program(ctx, shProg);
 679    }
 680 }
 681
 682 /**
 683  * Callback for deleting a framebuffer object.  Called by _mesa_HashDeleteAll()
 684  */
 685 static void
 686 delete_framebuffer_cb(GLuint id, void *data, void *userData)
 687 {
 688    struct gl_framebuffer *fb = (struct gl_framebuffer *) data;
 689    /* The fact that the framebuffer is in the hashtable means its refcount
 690     * is one, but we're removing from the hashtable now.  So clear refcount.
 691     */
 692    /*assert(fb->RefCount == 1);*/
 693    fb->RefCount = 0;
 694
 695    /* NOTE: Delete should always be defined but there are two reports
 696     * of it being NULL (bugs 13507, 14293).  Work-around for now.
 697     */
 698    if (fb->Delete)
 699       fb->Delete(fb);
 700 }
 701
 702 /**
 703  * Callback for deleting a renderbuffer object. Called by _mesa_HashDeleteAll()
 704  */
 705 static void
 706 delete_renderbuffer_cb(GLuint id, void *data, void *userData)
 707 {
 708    struct gl_renderbuffer *rb = (struct gl_renderbuffer *) data;
 709    rb->RefCount = 0;  /* see comment for FBOs above */
 710    if (rb->Delete)
 711       rb->Delete(rb);
 712 }
 713
 714
 715
 716 /**
 717  * Deallocate a shared state object and all children structures.
 718  *
 719  * \param ctx GL context.
 720  * \param ss shared state pointer.
 721  *
 722  * Frees the display lists, the texture objects (calling the driver texture
 723  * deletion callback to free its private data) and the vertex programs, as well
 724  * as their hash tables.
 725  *
 726  * \sa alloc_shared_state().
 727  */
 728 static void
 729 free_shared_state( GLcontext *ctx, struct gl_shared_state *ss )
 730 {
 731    /*
 732     * Free display lists
 733     */
 734    _mesa_HashDeleteAll(ss->DisplayList, delete_displaylist_cb, ctx);
 735    _mesa_DeleteHashTable(ss->DisplayList);
 736
 737 #if FEATURE_ARB_shader_objects
 738    _mesa_HashWalk(ss->ShaderObjects, free_shader_program_data_cb, ctx);
 739    _mesa_HashDeleteAll(ss->ShaderObjects, delete_shader_cb, ctx);
 740    _mesa_DeleteHashTable(ss->ShaderObjects);
 741 #endif
 742
 743    _mesa_HashDeleteAll(ss->Programs, delete_program_cb, ctx);
 744    _mesa_DeleteHashTable(ss->Programs);
 745
 746 #if FEATURE_ARB_vertex_program
 747    _mesa_reference_vertprog(ctx, &ss->DefaultVertexProgram, NULL);
 748 #endif
 749 #if FEATURE_ARB_fragment_program
 750    _mesa_reference_fragprog(ctx, &ss->DefaultFragmentProgram, NULL);
 751 #endif
 752
 753 #if FEATURE_ATI_fragment_shader
 754    _mesa_HashDeleteAll(ss->ATIShaders, delete_fragshader_cb, ctx);
 755    _mesa_DeleteHashTable(ss->ATIShaders);
 756    _mesa_delete_ati_fragment_shader(ctx, ss->DefaultFragmentShader);
 757 #endif
 758
 759 #if FEATURE_ARB_vertex_buffer_object || FEATURE_ARB_pixel_buffer_object
 760    _mesa_HashDeleteAll(ss->BufferObjects, delete_bufferobj_cb, ctx);
 761    _mesa_DeleteHashTable(ss->BufferObjects);
 762 #endif
 763
 764    _mesa_HashDeleteAll(ss->ArrayObjects, delete_arrayobj_cb, ctx);
 765    _mesa_DeleteHashTable(ss->ArrayObjects);
 766
 767 #if FEATURE_EXT_framebuffer_object
 768    _mesa_HashDeleteAll(ss->FrameBuffers, delete_framebuffer_cb, ctx);
 769    _mesa_DeleteHashTable(ss->FrameBuffers);
 770    _mesa_HashDeleteAll(ss->RenderBuffers, delete_renderbuffer_cb, ctx);
 771    _mesa_DeleteHashTable(ss->RenderBuffers);
 772 #endif
 773
 774    /*
 775     * Free texture objects (after FBOs since some textures might have
 776     * been bound to FBOs).
 777     */
 778    ASSERT(ctx->Driver.DeleteTexture);
 779    /* the default textures */
 780    ctx->Driver.DeleteTexture(ctx, ss->Default1D);
 781    ctx->Driver.DeleteTexture(ctx, ss->Default2D);
 782    ctx->Driver.DeleteTexture(ctx, ss->Default3D);
 783    ctx->Driver.DeleteTexture(ctx, ss->DefaultCubeMap);
 784    ctx->Driver.DeleteTexture(ctx, ss->DefaultRect);
 785    ctx->Driver.DeleteTexture(ctx, ss->Default1DArray);
 786    ctx->Driver.DeleteTexture(ctx, ss->Default2DArray);
 787    /* all other textures */
 788    _mesa_HashDeleteAll(ss->TexObjects, delete_texture_cb, ctx);
 789    _mesa_DeleteHashTable(ss->TexObjects);
 790
 791    _glthread_DESTROY_MUTEX(ss->Mutex);
 792
 793    _mesa_free(ss);
 794 }
 795
 796
 797 /**
 798  * Initialize fields of gl_current_attrib (aka ctx->Current.*)
 799  */
 800 static void
 801 _mesa_init_current(GLcontext *ctx)
 802 {
 803    GLuint i;
 804
 805    /* Init all to (0,0,0,1) */
 806    for (i = 0; i < VERT_ATTRIB_MAX; i++) {
 807       ASSIGN_4V( ctx->Current.Attrib[i], 0.0, 0.0, 0.0, 1.0 );
 808    }
 809
 810    /* redo special cases: */
 811    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_WEIGHT], 1.0, 0.0, 0.0, 0.0 );
 812    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_NORMAL], 0.0, 0.0, 1.0, 1.0 );
 813    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_COLOR0], 1.0, 1.0, 1.0, 1.0 );
 814    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_COLOR1], 0.0, 0.0, 0.0, 1.0 );
 815    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_COLOR_INDEX], 1.0, 0.0, 0.0, 1.0 );
 816    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_EDGEFLAG], 1.0, 0.0, 0.0, 1.0 );
 817 }
 818
 819
 820 /**
 821  * Init vertex/fragment program native limits from logical limits.
 822  */
 823 static void
 824 init_natives(struct gl_program_constants *prog)
 825 {
 826    prog->MaxNativeInstructions = prog->MaxInstructions;
 827    prog->MaxNativeAluInstructions = prog->MaxAluInstructions;
 828    prog->MaxNativeTexInstructions = prog->MaxTexInstructions;
 829    prog->MaxNativeTexIndirections = prog->MaxTexIndirections;
 830    prog->MaxNativeAttribs = prog->MaxAttribs;
 831    prog->MaxNativeTemps = prog->MaxTemps;
 832    prog->MaxNativeAddressRegs = prog->MaxAddressRegs;
 833    prog->MaxNativeParameters = prog->MaxParameters;
 834 }
 835
 836
 837 /**
 838  * Initialize fields of gl_constants (aka ctx->Const.*).
 839  * Use defaults from config.h.  The device drivers will often override
 840  * some of these values (such as number of texture units).
 841  */
 842 static void
 843 _mesa_init_constants(GLcontext *ctx)
 844 {
 845    assert(ctx);
 846
 847    assert(MAX_TEXTURE_LEVELS >= MAX_3D_TEXTURE_LEVELS);
 848    assert(MAX_TEXTURE_LEVELS >= MAX_CUBE_TEXTURE_LEVELS);
 849
 850    assert(MAX_TEXTURE_UNITS >= MAX_TEXTURE_COORD_UNITS);
 851    assert(MAX_TEXTURE_UNITS >= MAX_TEXTURE_IMAGE_UNITS);
 852
 853    /* Constants, may be overriden (usually only reduced) by device drivers */
 854    ctx->Const.MaxTextureLevels = MAX_TEXTURE_LEVELS;
 855    ctx->Const.Max3DTextureLevels = MAX_3D_TEXTURE_LEVELS;
 856    ctx->Const.MaxCubeTextureLevels = MAX_CUBE_TEXTURE_LEVELS;
 857    ctx->Const.MaxTextureRectSize = MAX_TEXTURE_RECT_SIZE;
 858    ctx->Const.MaxArrayTextureLayers = MAX_ARRAY_TEXTURE_LAYERS;
 859    ctx->Const.MaxTextureCoordUnits = MAX_TEXTURE_COORD_UNITS;
 860    ctx->Const.MaxTextureImageUnits = MAX_TEXTURE_IMAGE_UNITS;
 861    ctx->Const.MaxTextureUnits = MIN2(ctx->Const.MaxTextureCoordUnits,
 862                                      ctx->Const.MaxTextureImageUnits);
 863    ctx->Const.MaxTextureMaxAnisotropy = MAX_TEXTURE_MAX_ANISOTROPY;
 864    ctx->Const.MaxTextureLodBias = MAX_TEXTURE_LOD_BIAS;
 865    ctx->Const.MaxArrayLockSize = MAX_ARRAY_LOCK_SIZE;
 866    ctx->Const.SubPixelBits = SUB_PIXEL_BITS;
 867    ctx->Const.MinPointSize = MIN_POINT_SIZE;
 868    ctx->Const.MaxPointSize = MAX_POINT_SIZE;
 869    ctx->Const.MinPointSizeAA = MIN_POINT_SIZE;
 870    ctx->Const.MaxPointSizeAA = MAX_POINT_SIZE;
 871    ctx->Const.PointSizeGranularity = (GLfloat) POINT_SIZE_GRANULARITY;
 872    ctx->Const.MinLineWidth = MIN_LINE_WIDTH;
 873    ctx->Const.MaxLineWidth = MAX_LINE_WIDTH;
 874    ctx->Const.MinLineWidthAA = MIN_LINE_WIDTH;
 875    ctx->Const.MaxLineWidthAA = MAX_LINE_WIDTH;
 876    ctx->Const.LineWidthGranularity = (GLfloat) LINE_WIDTH_GRANULARITY;
 877    ctx->Const.MaxColorTableSize = MAX_COLOR_TABLE_SIZE;
 878    ctx->Const.MaxConvolutionWidth = MAX_CONVOLUTION_WIDTH;
 879    ctx->Const.MaxConvolutionHeight = MAX_CONVOLUTION_HEIGHT;
 880    ctx->Const.MaxClipPlanes = MAX_CLIP_PLANES;
 881    ctx->Const.MaxLights = MAX_LIGHTS;
 882    ctx->Const.MaxShininess = 128.0;
 883    ctx->Const.MaxSpotExponent = 128.0;
 884    ctx->Const.MaxViewportWidth = MAX_WIDTH;
 885    ctx->Const.MaxViewportHeight = MAX_HEIGHT;
 886 #if FEATURE_ARB_vertex_program
 887    ctx->Const.VertexProgram.MaxInstructions = MAX_NV_VERTEX_PROGRAM_INSTRUCTIONS;
 888    ctx->Const.VertexProgram.MaxAluInstructions = 0;
 889    ctx->Const.VertexProgram.MaxTexInstructions = 0;
 890    ctx->Const.VertexProgram.MaxTexIndirections = 0;
 891    ctx->Const.VertexProgram.MaxAttribs = MAX_NV_VERTEX_PROGRAM_INPUTS;
 892    ctx->Const.VertexProgram.MaxTemps = MAX_PROGRAM_TEMPS;
 893    ctx->Const.VertexProgram.MaxParameters = MAX_NV_VERTEX_PROGRAM_PARAMS;
 894    ctx->Const.VertexProgram.MaxLocalParams = MAX_PROGRAM_LOCAL_PARAMS;
 895    ctx->Const.VertexProgram.MaxEnvParams = MAX_PROGRAM_ENV_PARAMS;
 896    ctx->Const.VertexProgram.MaxAddressRegs = MAX_VERTEX_PROGRAM_ADDRESS_REGS;
 897    ctx->Const.VertexProgram.MaxUniformComponents = 4 * MAX_UNIFORMS;
 898    init_natives(&ctx->Const.VertexProgram);
 899 #endif
 900
 901 #if FEATURE_ARB_fragment_program
 902    ctx->Const.FragmentProgram.MaxInstructions = MAX_NV_FRAGMENT_PROGRAM_INSTRUCTIONS;
 903    ctx->Const.FragmentProgram.MaxAluInstructions = MAX_FRAGMENT_PROGRAM_ALU_INSTRUCTIONS;
 904    ctx->Const.FragmentProgram.MaxTexInstructions = MAX_FRAGMENT_PROGRAM_TEX_INSTRUCTIONS;
 905    ctx->Const.FragmentProgram.MaxTexIndirections = MAX_FRAGMENT_PROGRAM_TEX_INDIRECTIONS;
 906    ctx->Const.FragmentProgram.MaxAttribs = MAX_NV_FRAGMENT_PROGRAM_INPUTS;
 907    ctx->Const.FragmentProgram.MaxTemps = MAX_PROGRAM_TEMPS;
 908    ctx->Const.FragmentProgram.MaxParameters = MAX_NV_FRAGMENT_PROGRAM_PARAMS;
 909    ctx->Const.FragmentProgram.MaxLocalParams = MAX_PROGRAM_LOCAL_PARAMS;
 910    ctx->Const.FragmentProgram.MaxEnvParams = MAX_PROGRAM_ENV_PARAMS;
 911    ctx->Const.FragmentProgram.MaxAddressRegs = MAX_FRAGMENT_PROGRAM_ADDRESS_REGS;
 912    ctx->Const.FragmentProgram.MaxUniformComponents = 4 * MAX_UNIFORMS;
 913    init_natives(&ctx->Const.FragmentProgram);
 914 #endif
 915    ctx->Const.MaxProgramMatrices = MAX_PROGRAM_MATRICES;
 916    ctx->Const.MaxProgramMatrixStackDepth = MAX_PROGRAM_MATRIX_STACK_DEPTH;
 917
 918    /* CheckArrayBounds is overriden by drivers/x11 for X server */
 919    ctx->Const.CheckArrayBounds = GL_FALSE;
 920
 921    /* GL_ARB_draw_buffers */
 922    ctx->Const.MaxDrawBuffers = MAX_DRAW_BUFFERS;
 923
 924    /* GL_OES_read_format */
 925    ctx->Const.ColorReadFormat = GL_RGBA;
 926    ctx->Const.ColorReadType = GL_UNSIGNED_BYTE;
 927
 928 #if FEATURE_EXT_framebuffer_object
 929    ctx->Const.MaxColorAttachments = MAX_COLOR_ATTACHMENTS;
 930    ctx->Const.MaxRenderbufferSize = MAX_WIDTH;
 931 #endif
 932
 933 #if FEATURE_ARB_vertex_shader
 934    ctx->Const.MaxVertexTextureImageUnits = MAX_VERTEX_TEXTURE_IMAGE_UNITS;
 935    ctx->Const.MaxVarying = MAX_VARYING;
 936 #endif
 937
 938    /* sanity checks */
 939    ASSERT(ctx->Const.MaxTextureUnits == MIN2(ctx->Const.MaxTextureImageUnits,
 940                                              ctx->Const.MaxTextureCoordUnits));
 941    ASSERT(ctx->Const.FragmentProgram.MaxLocalParams <= MAX_PROGRAM_LOCAL_PARAMS);
 942    ASSERT(ctx->Const.VertexProgram.MaxLocalParams <= MAX_PROGRAM_LOCAL_PARAMS);
 943
 944    ASSERT(MAX_NV_FRAGMENT_PROGRAM_TEMPS <= MAX_PROGRAM_TEMPS);
 945    ASSERT(MAX_NV_VERTEX_PROGRAM_TEMPS <= MAX_PROGRAM_TEMPS);
 946    ASSERT(MAX_NV_VERTEX_PROGRAM_INPUTS <= VERT_ATTRIB_MAX);
 947    ASSERT(MAX_NV_VERTEX_PROGRAM_OUTPUTS <= VERT_RESULT_MAX);
 948 }
 949
 950
 951 /**
 952  * Do some sanity checks on the limits/constants for the given context.
 953  * Only called the first time a context is bound.
 954  */
 955 static void
 956 check_context_limits(GLcontext *ctx)
 957 {
 958    /* Many context limits/constants are limited by the size of
 959     * internal arrays.
 960     */
 961    assert(ctx->Const.MaxTextureImageUnits <= MAX_TEXTURE_IMAGE_UNITS);
 962    assert(ctx->Const.MaxTextureCoordUnits <= MAX_TEXTURE_COORD_UNITS);
 963    assert(ctx->Const.MaxTextureUnits <= MAX_TEXTURE_IMAGE_UNITS);
 964    assert(ctx->Const.MaxTextureUnits <= MAX_TEXTURE_COORD_UNITS);
 965
 966    assert(ctx->Const.MaxViewportWidth <= MAX_WIDTH);
 967    assert(ctx->Const.MaxViewportHeight <= MAX_WIDTH);
 968
 969    /* make sure largest texture image is <= MAX_WIDTH in size */
 970    assert((1 << (ctx->Const.MaxTextureLevels -1 )) <= MAX_WIDTH);
 971    assert((1 << (ctx->Const.MaxCubeTextureLevels -1 )) <= MAX_WIDTH);
 972    assert((1 << (ctx->Const.Max3DTextureLevels -1 )) <= MAX_WIDTH);
 973
 974    assert(ctx->Const.MaxDrawBuffers <= MAX_DRAW_BUFFERS);
 975
 976    /* XXX probably add more tests */
 977 }
 978
 979
 980 /**
 981  * Initialize the attribute groups in a GL context.
 982  *
 983  * \param ctx GL context.
 984  *
 985  * Initializes all the attributes, calling the respective <tt>init*</tt>
 986  * functions for the more complex data structures.
 987  */
 988 static GLboolean
 989 init_attrib_groups(GLcontext *ctx)
 990 {
 991    assert(ctx);
 992
 993    /* Constants */
 994    _mesa_init_constants( ctx );
 995
 996    /* Extensions */
 997    _mesa_init_extensions( ctx );
 998
 999    /* Attribute Groups */
1000 #if FEATURE_accum
1001    _mesa_init_accum( ctx );
1002 #endif
1003 #if FEATURE_attrib_stack
1004    _mesa_init_attrib( ctx );
1005 #endif
1006    _mesa_init_buffer_objects( ctx );
1007    _mesa_init_color( ctx );
1008 #if FEATURE_colortable
1009    _mesa_init_colortables( ctx );
1010 #endif
1011    _mesa_init_current( ctx );
1012    _mesa_init_depth( ctx );
1013    _mesa_init_debug( ctx );
1014 #if FEATURE_dlist
1015    _mesa_init_display_list( ctx );
1016 #endif
1017 #if FEATURE_evaluators
1018    _mesa_init_eval( ctx );
1019 #endif
1020    _mesa_init_fbobjects( ctx );
1021 #if FEATURE_feedback
1022    _mesa_init_feedback( ctx );
1023 #else
1024    ctx->RenderMode = GL_RENDER;
1025 #endif
1026    _mesa_init_fog( ctx );
1027 #if FEATURE_histogram
1028    _mesa_init_histogram( ctx );
1029 #endif
1030    _mesa_init_hint( ctx );
1031    _mesa_init_line( ctx );
1032    _mesa_init_lighting( ctx );
1033    _mesa_init_matrix( ctx );
1034    _mesa_init_multisample( ctx );
1035    _mesa_init_pixel( ctx );
1036    _mesa_init_pixelstore( ctx );
1037    _mesa_init_point( ctx );
1038    _mesa_init_polygon( ctx );
1039    _mesa_init_program( ctx );
1040 #if FEATURE_ARB_occlusion_query
1041    _mesa_init_query( ctx );
1042 #endif
1043 #if FEATURE_drawpix
1044    _mesa_init_rastpos( ctx );
1045 #endif
1046    _mesa_init_scissor( ctx );
1047    _mesa_init_shader_state( ctx );
1048    _mesa_init_stencil( ctx );
1049    _mesa_init_transform( ctx );
1050    _mesa_init_varray( ctx );
1051    _mesa_init_viewport( ctx );
1052
1053    if (!_mesa_init_texture( ctx ))
1054       return GL_FALSE;
1055
1056 #if FEATURE_texture_s3tc
1057    _mesa_init_texture_s3tc( ctx );
1058 #endif
1059 #if FEATURE_texture_fxt1
1060    _mesa_init_texture_fxt1( ctx );
1061 #endif
1062
1063    /* Miscellaneous */
1064    ctx->NewState = _NEW_ALL;
1065    ctx->ErrorValue = (GLenum) GL_NO_ERROR;
1066
1067    return GL_TRUE;
1068 }
1069
1070
1071 /**
1072  * Update default objects in a GL context with respect to shared state.
1073  *
1074  * \param ctx GL context.
1075  *
1076  * Removes references to old default objects, (texture objects, program
1077  * objects, etc.) and changes to reference those from the current shared
1078  * state.
1079  */
1080 static GLboolean
1081 update_default_objects(GLcontext *ctx)
1082 {
1083    assert(ctx);
1084
1085    _mesa_update_default_objects_program(ctx);
1086    _mesa_update_default_objects_texture(ctx);
1087    _mesa_update_default_objects_buffer_objects(ctx);
1088
1089    return GL_TRUE;
1090 }
1091
1092
1093 /**
1094  * This is the default function we plug into all dispatch table slots
1095  * This helps prevents a segfault when someone calls a GL function without
1096  * first checking if the extension's supported.
1097  */
1098 static int
1099 generic_nop(void)
1100 {
1101    _mesa_warning(NULL, "User called no-op dispatch function (an unsupported extension function?)");
1102    return 0;
1103 }
1104
1105
1106 /**
1107  * Allocate and initialize a new dispatch table.
1108  */
1109 static struct _glapi_table *
1110 alloc_dispatch_table(void)
1111 {
1112    /* Find the larger of Mesa's dispatch table and libGL's dispatch table.
1113     * In practice, this'll be the same for stand-alone Mesa.  But for DRI
1114     * Mesa we do this to accomodate different versions of libGL and various
1115     * DRI drivers.
1116     */
1117    GLint numEntries = MAX2(_glapi_get_dispatch_table_size(),
1118                            sizeof(struct _glapi_table) / sizeof(_glapi_proc));
1119    struct _glapi_table *table =
1120       (struct _glapi_table *) _mesa_malloc(numEntries * sizeof(_glapi_proc));
1121    if (table) {
1122       _glapi_proc *entry = (_glapi_proc *) table;
1123       GLint i;
1124       for (i = 0; i < numEntries; i++) {
1125          entry[i] = (_glapi_proc) generic_nop;
1126       }
1127    }
1128    return table;
1129 }
1130
1131
1132 /**
1133  * Initialize a GLcontext struct (rendering context).
1134  *
1135  * This includes allocating all the other structs and arrays which hang off of
1136  * the context by pointers.
1137  * Note that the driver needs to pass in its dd_function_table here since
1138  * we need to at least call driverFunctions->NewTextureObject to create the
1139  * default texture objects.
1140  *
1141  * Called by _mesa_create_context().
1142  *
1143  * Performs the imports and exports callback tables initialization, and
1144  * miscellaneous one-time initializations. If no shared context is supplied one
1145  * is allocated, and increase its reference count.  Setups the GL API dispatch
1146  * tables.  Initialize the TNL module. Sets the maximum Z buffer depth.
1147  * Finally queries the \c MESA_DEBUG and \c MESA_VERBOSE environment variables
1148  * for debug flags.
1149  *
1150  * \param ctx the context to initialize
1151  * \param visual describes the visual attributes for this context
1152  * \param share_list points to context to share textures, display lists,
1153  *        etc with, or NULL
1154  * \param driverFunctions table of device driver functions for this context
1155  *        to use
1156  * \param driverContext pointer to driver-specific context data
1157  */
1158 GLboolean
1159 _mesa_initialize_context(GLcontext *ctx,
1160                          const GLvisual *visual,
1161                          GLcontext *share_list,
1162                          const struct dd_function_table *driverFunctions,
1163                          void *driverContext)
1164 {
1165    ASSERT(driverContext);
1166    assert(driverFunctions->NewTextureObject);
1167    assert(driverFunctions->FreeTexImageData);
1168
1169    /* misc one-time initializations */
1170    one_time_init(ctx);
1171
1172    ctx->Visual = *visual;
1173    ctx->DrawBuffer = NULL;
1174    ctx->ReadBuffer = NULL;
1175    ctx->WinSysDrawBuffer = NULL;
1176    ctx->WinSysReadBuffer = NULL;
1177
1178    /* Plug in driver functions and context pointer here.
1179     * This is important because when we call alloc_shared_state() below
1180     * we'll call ctx->Driver.NewTextureObject() to create the default
1181     * textures.
1182     */
1183    ctx->Driver = *driverFunctions;
1184    ctx->DriverCtx = driverContext;
1185
1186    if (share_list) {
1187       /* share state with another context */
1188       ctx->Shared = share_list->Shared;
1189    }
1190    else {
1191       /* allocate new, unshared state */
1192       if (!alloc_shared_state( ctx )) {
1193          return GL_FALSE;
1194       }
1195    }
1196    _glthread_LOCK_MUTEX(ctx->Shared->Mutex);
1197    ctx->Shared->RefCount++;
1198    _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
1199
1200    if (!init_attrib_groups( ctx )) {
1201       free_shared_state(ctx, ctx->Shared);
1202       return GL_FALSE;
1203    }
1204
1205    /* setup the API dispatch tables */
1206    ctx->Exec = alloc_dispatch_table();
1207    ctx->Save = alloc_dispatch_table();
1208    if (!ctx->Exec || !ctx->Save) {
1209       free_shared_state(ctx, ctx->Shared);
1210       if (ctx->Exec)
1211          _mesa_free(ctx->Exec);
1212    }
1213 #if FEATURE_dispatch
1214    _mesa_init_exec_table(ctx->Exec);
1215 #endif
1216    ctx->CurrentDispatch = ctx->Exec;
1217 #if FEATURE_dlist
1218    _mesa_init_dlist_table(ctx->Save);
1219    _mesa_install_save_vtxfmt( ctx, &ctx->ListState.ListVtxfmt );
1220 #endif
1221    /* Neutral tnl module stuff */
1222    _mesa_init_exec_vtxfmt( ctx );
1223    ctx->TnlModule.Current = NULL;
1224    ctx->TnlModule.SwapCount = 0;
1225
1226    ctx->FragmentProgram._MaintainTexEnvProgram
1227       = (_mesa_getenv("MESA_TEX_PROG") != NULL);
1228    ctx->FragmentProgram._UseTexEnvProgram = ctx->FragmentProgram._MaintainTexEnvProgram;
1229
1230    ctx->VertexProgram._MaintainTnlProgram
1231       = (_mesa_getenv("MESA_TNL_PROG") != NULL);
1232    if (ctx->VertexProgram._MaintainTnlProgram) {
1233       /* this is required... */
1234       ctx->FragmentProgram._MaintainTexEnvProgram = GL_TRUE;
1235    }
1236
1237 #ifdef FEATURE_extra_context_init
1238    _mesa_initialize_context_extra(ctx);
1239 #endif
1240
1241    ctx->FirstTimeCurrent = GL_TRUE;
1242
1243    return GL_TRUE;
1244 }
1245
1246
1247 /**
1248  * Allocate and initialize a GLcontext structure.
1249  * Note that the driver needs to pass in its dd_function_table here since
1250  * we need to at least call driverFunctions->NewTextureObject to initialize
1251  * the rendering context.
1252  *
1253  * \param visual a GLvisual pointer (we copy the struct contents)
1254  * \param share_list another context to share display lists with or NULL
1255  * \param driverFunctions points to the dd_function_table into which the
1256  *        driver has plugged in all its special functions.
1257  * \param driverCtx points to the device driver's private context state
1258  *
1259  * \return pointer to a new __GLcontextRec or NULL if error.
1260  */
1261 GLcontext *
1262 _mesa_create_context(const GLvisual *visual,
1263                      GLcontext *share_list,
1264                      const struct dd_function_table *driverFunctions,
1265                      void *driverContext)
1266 {
1267    GLcontext *ctx;
1268
1269    ASSERT(visual);
1270    ASSERT(driverContext);
1271
1272    ctx = (GLcontext *) _mesa_calloc(sizeof(GLcontext));
1273    if (!ctx)
1274       return NULL;
1275
1276    if (_mesa_initialize_context(ctx, visual, share_list,
1277                                 driverFunctions, driverContext)) {
1278       return ctx;
1279    }
1280    else {
1281       _mesa_free(ctx);
1282       return NULL;
1283    }
1284 }
1285
1286
1287 /**
1288  * Free the data associated with the given context.
1289  *
1290  * But doesn't free the GLcontext struct itself.
1291  *
1292  * \sa _mesa_initialize_context() and init_attrib_groups().
1293  */
1294 void
1295 _mesa_free_context_data( GLcontext *ctx )
1296 {
1297    if (!_mesa_get_current_context()){
1298       /* No current context, but we may need one in order to delete
1299        * texture objs, etc.  So temporarily bind the context now.
1300        */
1301       _mesa_make_current(ctx, NULL, NULL);
1302    }
1303
1304    /* unreference WinSysDraw/Read buffers */
1305    _mesa_unreference_framebuffer(&ctx->WinSysDrawBuffer);
1306    _mesa_unreference_framebuffer(&ctx->WinSysReadBuffer);
1307    _mesa_unreference_framebuffer(&ctx->DrawBuffer);
1308    _mesa_unreference_framebuffer(&ctx->ReadBuffer);
1309
1310    _mesa_reference_vertprog(ctx, &ctx->VertexProgram.Current, NULL);
1311    _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current, NULL);
1312    _mesa_reference_vertprog(ctx, &ctx->VertexProgram._TnlProgram, NULL);
1313
1314    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram.Current, NULL);
1315    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current, NULL);
1316    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram, NULL);
1317
1318    _mesa_free_attrib_data(ctx);
1319    _mesa_free_lighting_data( ctx );
1320 #if FEATURE_evaluators
1321    _mesa_free_eval_data( ctx );
1322 #endif
1323    _mesa_free_texture_data( ctx );
1324    _mesa_free_matrix_data( ctx );
1325    _mesa_free_viewport_data( ctx );
1326 #if FEATURE_colortable
1327    _mesa_free_colortables_data( ctx );
1328 #endif
1329    _mesa_free_program_data(ctx);
1330    _mesa_free_shader_state(ctx);
1331 #if FEATURE_ARB_occlusion_query
1332    _mesa_free_query_data(ctx);
1333 #endif
1334
1335 #if FEATURE_ARB_vertex_buffer_object
1336    _mesa_delete_buffer_object(ctx, ctx->Array.NullBufferObj);
1337 #endif
1338    _mesa_delete_array_object(ctx, ctx->Array.DefaultArrayObj);
1339
1340    /* free dispatch tables */
1341    _mesa_free(ctx->Exec);
1342    _mesa_free(ctx->Save);
1343
1344    /* Shared context state (display lists, textures, etc) */
1345    _glthread_LOCK_MUTEX(ctx->Shared->Mutex);
1346    ctx->Shared->RefCount--;
1347    assert(ctx->Shared->RefCount >= 0);
1348    _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
1349    if (ctx->Shared->RefCount == 0) {
1350       /* free shared state */
1351       free_shared_state( ctx, ctx->Shared );
1352    }
1353
1354    if (ctx->Extensions.String)
1355       _mesa_free((void *) ctx->Extensions.String);
1356
1357    /* unbind the context if it's currently bound */
1358    if (ctx == _mesa_get_current_context()) {
1359       _mesa_make_current(NULL, NULL, NULL);
1360    }
1361 }
1362
1363
1364 /**
1365  * Destroy a GLcontext structure.
1366  *
1367  * \param ctx GL context.
1368  *
1369  * Calls _mesa_free_context_data() and frees the GLcontext structure itself.
1370  */
1371 void
1372 _mesa_destroy_context( GLcontext *ctx )
1373 {
1374    if (ctx) {
1375       _mesa_free_context_data(ctx);
1376       _mesa_free( (void *) ctx );
1377    }
1378 }
1379
1380
1381 #if _HAVE_FULL_GL
1382 /**
1383  * Copy attribute groups from one context to another.
1384  *
1385  * \param src source context
1386  * \param dst destination context
1387  * \param mask bitwise OR of GL_*_BIT flags
1388  *
1389  * According to the bits specified in \p mask, copies the corresponding
1390  * attributes from \p src into \p dst.  For many of the attributes a simple \c
1391  * memcpy is not enough due to the existence of internal pointers in their data
1392  * structures.
1393  */
1394 void
1395 _mesa_copy_context( const GLcontext *src, GLcontext *dst, GLuint mask )
1396 {
1397    if (mask & GL_ACCUM_BUFFER_BIT) {
1398       /* OK to memcpy */
1399       dst->Accum = src->Accum;
1400    }
1401    if (mask & GL_COLOR_BUFFER_BIT) {
1402       /* OK to memcpy */
1403       dst->Color = src->Color;
1404    }
1405    if (mask & GL_CURRENT_BIT) {
1406       /* OK to memcpy */
1407       dst->Current = src->Current;
1408    }
1409    if (mask & GL_DEPTH_BUFFER_BIT) {
1410       /* OK to memcpy */
1411       dst->Depth = src->Depth;
1412    }
1413    if (mask & GL_ENABLE_BIT) {
1414       /* no op */
1415    }
1416    if (mask & GL_EVAL_BIT) {
1417       /* OK to memcpy */
1418       dst->Eval = src->Eval;
1419    }
1420    if (mask & GL_FOG_BIT) {
1421       /* OK to memcpy */
1422       dst->Fog = src->Fog;
1423    }
1424    if (mask & GL_HINT_BIT) {
1425       /* OK to memcpy */
1426       dst->Hint = src->Hint;
1427    }
1428    if (mask & GL_LIGHTING_BIT) {
1429       GLuint i;
1430       /* begin with memcpy */
1431       dst->Light = src->Light;
1432       /* fixup linked lists to prevent pointer insanity */
1433       make_empty_list( &(dst->Light.EnabledList) );
1434       for (i = 0; i < MAX_LIGHTS; i++) {
1435          if (dst->Light.Light[i].Enabled) {
1436             insert_at_tail(&(dst->Light.EnabledList), &(dst->Light.Light[i]));
1437          }
1438       }
1439    }
1440    if (mask & GL_LINE_BIT) {
1441       /* OK to memcpy */
1442       dst->Line = src->Line;
1443    }
1444    if (mask & GL_LIST_BIT) {
1445       /* OK to memcpy */
1446       dst->List = src->List;
1447    }
1448    if (mask & GL_PIXEL_MODE_BIT) {
1449       /* OK to memcpy */
1450       dst->Pixel = src->Pixel;
1451    }
1452    if (mask & GL_POINT_BIT) {
1453       /* OK to memcpy */
1454       dst->Point = src->Point;
1455    }
1456    if (mask & GL_POLYGON_BIT) {
1457       /* OK to memcpy */
1458       dst->Polygon = src->Polygon;
1459    }
1460    if (mask & GL_POLYGON_STIPPLE_BIT) {
1461       /* Use loop instead of MEMCPY due to problem with Portland Group's
1462        * C compiler.  Reported by John Stone.
1463        */
1464       GLuint i;
1465       for (i = 0; i < 32; i++) {
1466          dst->PolygonStipple[i] = src->PolygonStipple[i];
1467       }
1468    }
1469    if (mask & GL_SCISSOR_BIT) {
1470       /* OK to memcpy */
1471       dst->Scissor = src->Scissor;
1472    }
1473    if (mask & GL_STENCIL_BUFFER_BIT) {
1474       /* OK to memcpy */
1475       dst->Stencil = src->Stencil;
1476    }
1477    if (mask & GL_TEXTURE_BIT) {
1478       /* Cannot memcpy because of pointers */
1479       _mesa_copy_texture_state(src, dst);
1480    }
1481    if (mask & GL_TRANSFORM_BIT) {
1482       /* OK to memcpy */
1483       dst->Transform = src->Transform;
1484    }
1485    if (mask & GL_VIEWPORT_BIT) {
1486       /* Cannot use memcpy, because of pointers in GLmatrix _WindowMap */
1487       dst->Viewport.X = src->Viewport.X;
1488       dst->Viewport.Y = src->Viewport.Y;
1489       dst->Viewport.Width = src->Viewport.Width;
1490       dst->Viewport.Height = src->Viewport.Height;
1491       dst->Viewport.Near = src->Viewport.Near;
1492       dst->Viewport.Far = src->Viewport.Far;
1493       _math_matrix_copy(&dst->Viewport._WindowMap, &src->Viewport._WindowMap);
1494    }
1495
1496    /* XXX FIXME:  Call callbacks?
1497     */
1498    dst->NewState = _NEW_ALL;
1499 }
1500 #endif
1501
1502
1503 /**
1504  * Check if the given context can render into the given framebuffer
1505  * by checking visual attributes.
1506  *
1507  * Most of these tests could go away because Mesa is now pretty flexible
1508  * in terms of mixing rendering contexts with framebuffers.  As long
1509  * as RGB vs. CI mode agree, we're probably good.
1510  *
1511  * \return GL_TRUE if compatible, GL_FALSE otherwise.
1512  */
1513 static GLboolean
1514 check_compatible(const GLcontext *ctx, const GLframebuffer *buffer)
1515 {
1516    const GLvisual *ctxvis = &ctx->Visual;
1517    const GLvisual *bufvis = &buffer->Visual;
1518
1519    if (ctxvis == bufvis)
1520       return GL_TRUE;
1521
1522    if (ctxvis->rgbMode != bufvis->rgbMode)
1523       return GL_FALSE;
1524 #if 0
1525    /* disabling this fixes the fgl_glxgears pbuffer demo */
1526    if (ctxvis->doubleBufferMode && !bufvis->doubleBufferMode)
1527       return GL_FALSE;
1528 #endif
1529    if (ctxvis->stereoMode && !bufvis->stereoMode)
1530       return GL_FALSE;
1531    if (ctxvis->haveAccumBuffer && !bufvis->haveAccumBuffer)
1532       return GL_FALSE;
1533    if (ctxvis->haveDepthBuffer && !bufvis->haveDepthBuffer)
1534       return GL_FALSE;
1535    if (ctxvis->haveStencilBuffer && !bufvis->haveStencilBuffer)
1536       return GL_FALSE;
1537    if (ctxvis->redMask && ctxvis->redMask != bufvis->redMask)
1538       return GL_FALSE;
1539    if (ctxvis->greenMask && ctxvis->greenMask != bufvis->greenMask)
1540       return GL_FALSE;
1541    if (ctxvis->blueMask && ctxvis->blueMask != bufvis->blueMask)
1542       return GL_FALSE;
1543 #if 0
1544    /* disabled (see bug 11161) */
1545    if (ctxvis->depthBits && ctxvis->depthBits != bufvis->depthBits)
1546       return GL_FALSE;
1547 #endif
1548    if (ctxvis->stencilBits && ctxvis->stencilBits != bufvis->stencilBits)
1549       return GL_FALSE;
1550
1551    return GL_TRUE;
1552 }
1553
1554
1555 /**
1556  * Do one-time initialization for the given framebuffer.  Specifically,
1557  * ask the driver for the window's current size and update the framebuffer
1558  * object to match.
1559  * Really, the device driver should totally take care of this.
1560  */
1561 static void
1562 initialize_framebuffer_size(GLcontext *ctx, GLframebuffer *fb)
1563 {
1564    GLuint width, height;
1565    if (ctx->Driver.GetBufferSize) {
1566       ctx->Driver.GetBufferSize(fb, &width, &height);
1567       if (ctx->Driver.ResizeBuffers)
1568          ctx->Driver.ResizeBuffers(ctx, fb, width, height);
1569       fb->Initialized = GL_TRUE;
1570    }
1571 }
1572
1573
1574 /**
1575  * Bind the given context to the given drawBuffer and readBuffer and
1576  * make it the current context for the calling thread.
1577  * We'll render into the drawBuffer and read pixels from the
1578  * readBuffer (i.e. glRead/CopyPixels, glCopyTexImage, etc).
1579  *
1580  * We check that the context's and framebuffer's visuals are compatible
1581  * and return immediately if they're not.
1582  *
1583  * \param newCtx  the new GL context. If NULL then there will be no current GL
1584  *                context.
1585  * \param drawBuffer  the drawing framebuffer
1586  * \param readBuffer  the reading framebuffer
1587  */
1588 void
1589 _mesa_make_current( GLcontext *newCtx, GLframebuffer *drawBuffer,
1590                     GLframebuffer *readBuffer )
1591 {
1592    if (MESA_VERBOSE & VERBOSE_API)
1593       _mesa_debug(newCtx, "_mesa_make_current()\n");
1594
1595    /* Check that the context's and framebuffer's visuals are compatible.
1596     */
1597    if (newCtx && drawBuffer && newCtx->WinSysDrawBuffer != drawBuffer) {
1598       if (!check_compatible(newCtx, drawBuffer)) {
1599          _mesa_warning(newCtx,
1600               "MakeCurrent: incompatible visuals for context and drawbuffer");
1601          return;
1602       }
1603    }
1604    if (newCtx && readBuffer && newCtx->WinSysReadBuffer != readBuffer) {
1605       if (!check_compatible(newCtx, readBuffer)) {
1606          _mesa_warning(newCtx,
1607               "MakeCurrent: incompatible visuals for context and readbuffer");
1608          return;
1609       }
1610    }
1611
1612    /* We used to call _glapi_check_multithread() here.  Now do it in drivers */
1613    _glapi_set_context((void *) newCtx);
1614    ASSERT(_mesa_get_current_context() == newCtx);
1615
1616    if (!newCtx) {
1617       _glapi_set_dispatch(NULL);  /* none current */
1618    }
1619    else {
1620       _glapi_set_dispatch(newCtx->CurrentDispatch);
1621
1622       if (drawBuffer && readBuffer) {
1623          /* TODO: check if newCtx and buffer's visual match??? */
1624
1625          ASSERT(drawBuffer->Name == 0);
1626          ASSERT(readBuffer->Name == 0);
1627          _mesa_reference_framebuffer(&newCtx->WinSysDrawBuffer, drawBuffer);
1628          _mesa_reference_framebuffer(&newCtx->WinSysReadBuffer, readBuffer);
1629
1630          /*
1631           * Only set the context's Draw/ReadBuffer fields if they're NULL
1632           * or not bound to a user-created FBO.
1633           */
1634          if (!newCtx->DrawBuffer || newCtx->DrawBuffer->Name == 0) {
1635             _mesa_reference_framebuffer(&newCtx->DrawBuffer, drawBuffer);
1636          }
1637          if (!newCtx->ReadBuffer || newCtx->ReadBuffer->Name == 0) {
1638             _mesa_reference_framebuffer(&newCtx->ReadBuffer, readBuffer);
1639          }
1640
1641          /* XXX only set this flag if we're really changing the draw/read
1642           * framebuffer bindings.
1643           */
1644          newCtx->NewState |= _NEW_BUFFERS;
1645
1646 #if 1
1647          /* We want to get rid of these lines: */
1648
1649 #if _HAVE_FULL_GL
1650          if (!drawBuffer->Initialized) {
1651             initialize_framebuffer_size(newCtx, drawBuffer);
1652          }
1653          if (readBuffer != drawBuffer && !readBuffer->Initialized) {
1654             initialize_framebuffer_size(newCtx, readBuffer);
1655          }
1656
1657          _mesa_resizebuffers(newCtx);
1658 #endif
1659
1660 #else
1661          /* We want the drawBuffer and readBuffer to be initialized by
1662           * the driver.
1663           * This generally means the Width and Height match the actual
1664           * window size and the renderbuffers (both hardware and software
1665           * based) are allocated to match.  The later can generally be
1666           * done with a call to _mesa_resize_framebuffer().
1667           *
1668           * It's theoretically possible for a buffer to have zero width
1669           * or height, but for now, assert check that the driver did what's
1670           * expected of it.
1671           */
1672          ASSERT(drawBuffer->Width > 0);
1673          ASSERT(drawBuffer->Height > 0);
1674 #endif
1675
1676          if (newCtx->FirstTimeCurrent) {
1677             /* set initial viewport and scissor size now */
1678             _mesa_set_viewport(newCtx, 0, 0,
1679                                drawBuffer->Width, drawBuffer->Height);
1680             _mesa_set_scissor(newCtx, 0, 0,
1681                               drawBuffer->Width, drawBuffer->Height );
1682             check_context_limits(newCtx);
1683          }
1684       }
1685
1686       /* We can use this to help debug user's problems.  Tell them to set
1687        * the MESA_INFO env variable before running their app.  Then the
1688        * first time each context is made current we'll print some useful
1689        * information.
1690        */
1691       if (newCtx->FirstTimeCurrent) {
1692          if (_mesa_getenv("MESA_INFO")) {
1693             _mesa_print_info();
1694          }
1695          newCtx->FirstTimeCurrent = GL_FALSE;
1696       }
1697    }
1698 }
1699
1700
1701 /**
1702  * Make context 'ctx' share the display lists, textures and programs
1703  * that are associated with 'ctxToShare'.
1704  * Any display lists, textures or programs associated with 'ctx' will
1705  * be deleted if nobody else is sharing them.
1706  */
1707 GLboolean
1708 _mesa_share_state(GLcontext *ctx, GLcontext *ctxToShare)
1709 {
1710    if (ctx && ctxToShare && ctx->Shared && ctxToShare->Shared) {
1711       struct gl_shared_state *oldSharedState = ctx->Shared;
1712
1713       ctx->Shared = ctxToShare->Shared;
1714       ctx->Shared->RefCount++;
1715
1716       update_default_objects(ctx);
1717
1718       oldSharedState->RefCount--;
1719       if (oldSharedState->RefCount == 0) {
1720          free_shared_state(ctx, oldSharedState);
1721       }
1722
1723       return GL_TRUE;
1724    }
1725    else {
1726       return GL_FALSE;
1727    }
1728 }
1729
1730
1731
1732 /**
1733  * \return pointer to the current GL context for this thread.
1734  *
1735  * Calls _glapi_get_context(). This isn't the fastest way to get the current
1736  * context.  If you need speed, see the #GET_CURRENT_CONTEXT macro in
1737  * context.h.
1738  */
1739 GLcontext *
1740 _mesa_get_current_context( void )
1741 {
1742    return (GLcontext *) _glapi_get_context();
1743 }
1744
1745
1746 /**
1747  * Get context's current API dispatch table.
1748  *
1749  * It'll either be the immediate-mode execute dispatcher or the display list
1750  * compile dispatcher.
1751  *
1752  * \param ctx GL context.
1753  *
1754  * \return pointer to dispatch_table.
1755  *
1756  * Simply returns __GLcontextRec::CurrentDispatch.
1757  */
1758 struct _glapi_table *
1759 _mesa_get_dispatch(GLcontext *ctx)
1760 {
1761    return ctx->CurrentDispatch;
1762 }
1763
1764 /*@}*/
1765
1766
1767 /**********************************************************************/
1768 /** \name Miscellaneous functions                                     */
1769 /**********************************************************************/
1770 /*@{*/
1771
1772 /**
1773  * Record an error.
1774  *
1775  * \param ctx GL context.
1776  * \param error error code.
1777  *
1778  * Records the given error code and call the driver's dd_function_table::Error
1779  * function if defined.
1780  *
1781  * \sa
1782  * This is called via _mesa_error().
1783  */
1784 void
1785 _mesa_record_error(GLcontext *ctx, GLenum error)
1786 {
1787    if (!ctx)
1788       return;
1789
1790    if (ctx->ErrorValue == GL_NO_ERROR) {
1791       ctx->ErrorValue = error;
1792    }
1793
1794    /* Call device driver's error handler, if any.  This is used on the Mac. */
1795    if (ctx->Driver.Error) {
1796       ctx->Driver.Error(ctx);
1797    }
1798 }
1799
1800
1801 /**
1802  * Execute glFinish().
1803  *
1804  * Calls the #ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH macro and the
1805  * dd_function_table::Finish driver callback, if not NULL.
1806  */
1807 void GLAPIENTRY
1808 _mesa_Finish(void)
1809 {
1810    GET_CURRENT_CONTEXT(ctx);
1811    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
1812    if (ctx->Driver.Finish) {
1813       ctx->Driver.Finish(ctx);
1814    }
1815 }
1816
1817
1818 /**
1819  * Execute glFlush().
1820  *
1821  * Calls the #ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH macro and the
1822  * dd_function_table::Flush driver callback, if not NULL.
1823  */
1824 void GLAPIENTRY
1825 _mesa_Flush(void)
1826 {
1827    GET_CURRENT_CONTEXT(ctx);
1828    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
1829    if (ctx->Driver.Flush) {
1830       ctx->Driver.Flush(ctx);
1831    }
1832 }
1833
1834
1835 /*@}*/