src/mesa/main/context.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.3
   4  *
   5  * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
   6  * Copyright (C) 2008  VMware, Inc.  All Rights Reserved.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a
   9  * copy of this software and associated documentation files (the "Software"),
  10  * to deal in the Software without restriction, including without limitation
  11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12  * and/or sell copies of the Software, and to permit persons to whom the
  13  * Software is furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included
  16  * in all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  21  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  22  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  23  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26 /**
  27  * \file context.c
  28  * Mesa context/visual/framebuffer management functions.
  29  * \author Brian Paul
  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 "mfeatures.h"
  81 #include "imports.h"
  82 #include "accum.h"
  83 #include "api_exec.h"
  84 #include "arrayobj.h"
  85 #include "attrib.h"
  86 #include "blend.h"
  87 #include "buffers.h"
  88 #include "bufferobj.h"
  89 #include "colortab.h"
  90 #include "context.h"
  91 #include "cpuinfo.h"
  92 #include "debug.h"
  93 #include "depth.h"
  94 #include "dlist.h"
  95 #include "eval.h"
  96 #include "enums.h"
  97 #include "extensions.h"
  98 #include "fbobject.h"
  99 #include "feedback.h"
 100 #include "fog.h"
 101 #include "framebuffer.h"
 102 #include "get.h"
 103 #include "histogram.h"
 104 #include "hint.h"
 105 #include "hash.h"
 106 #include "light.h"
 107 #include "lines.h"
 108 #include "macros.h"
 109 #include "matrix.h"
 110 #include "multisample.h"
 111 #include "pixel.h"
 112 #include "pixelstore.h"
 113 #include "points.h"
 114 #include "polygon.h"
 115 #include "queryobj.h"
 116 #if FEATURE_ARB_sync
 117 #include "syncobj.h"
 118 #endif
 119 #include "rastpos.h"
 120 #include "remap.h"
 121 #include "scissor.h"
 122 #include "shared.h"
 123 #include "simple_list.h"
 124 #include "state.h"
 125 #include "stencil.h"
 126 #include "texcompress_s3tc.h"
 127 #include "teximage.h"
 128 #include "texobj.h"
 129 #include "texstate.h"
 130 #include "mtypes.h"
 131 #include "varray.h"
 132 #include "version.h"
 133 #include "viewport.h"
 134 #include "vtxfmt.h"
 135 #include "glapi/glthread.h"
 136 #include "glapi/glapitable.h"
 137 #include "shader/program.h"
 138 #include "shader/prog_print.h"
 139 #include "shader/shader_api.h"
 140 #if FEATURE_ATI_fragment_shader
 141 #include "shader/atifragshader.h"
 142 #endif
 143 #if _HAVE_FULL_GL
 144 #include "math/m_matrix.h"
 145 #endif
 146
 147 #ifdef USE_SPARC_ASM
 148 #include "sparc/sparc.h"
 149 #endif
 150
 151 #ifndef MESA_VERBOSE
 152 int MESA_VERBOSE = 0;
 153 #endif
 154
 155 #ifndef MESA_DEBUG_FLAGS
 156 int MESA_DEBUG_FLAGS = 0;
 157 #endif
 158
 159
 160 /* ubyte -> float conversion */
 161 GLfloat _mesa_ubyte_to_float_color_tab[256];
 162
 163
 164
 165 /**
 166  * Swap buffers notification callback.
 167  *
 168  * \param ctx GL context.
 169  *
 170  * Called by window system just before swapping buffers.
 171  * We have to finish any pending rendering.
 172  */
 173 void
 174 _mesa_notifySwapBuffers(__GLcontext *ctx)
 175 {
 176    if (MESA_VERBOSE & VERBOSE_SWAPBUFFERS)
 177       _mesa_debug(ctx, "SwapBuffers\n");
 178    FLUSH_CURRENT( ctx, 0 );
 179    if (ctx->Driver.Flush) {
 180       ctx->Driver.Flush(ctx);
 181    }
 182 }
 183
 184
 185 /**********************************************************************/
 186 /** \name GL Visual allocation/destruction                            */
 187 /**********************************************************************/
 188 /*@{*/
 189
 190 /**
 191  * Allocates a GLvisual structure and initializes it via
 192  * _mesa_initialize_visual().
 193  *
 194  * \param rgbFlag GL_TRUE for RGB(A) mode, GL_FALSE for Color Index mode.
 195  * \param dbFlag double buffering
 196  * \param stereoFlag stereo buffer
 197  * \param depthBits requested bits per depth buffer value. Any value in [0, 32]
 198  * is acceptable but the actual depth type will be GLushort or GLuint as
 199  * needed.
 200  * \param stencilBits requested minimum bits per stencil buffer value
 201  * \param accumRedBits, accumGreenBits, accumBlueBits, accumAlphaBits number of bits per color component in accum buffer.
 202  * \param indexBits number of bits per pixel if \p rgbFlag is GL_FALSE
 203  * \param redBits number of bits per color component in frame buffer for RGB(A)
 204  * mode.  We always use 8 in core Mesa though.
 205  * \param greenBits same as above.
 206  * \param blueBits same as above.
 207  * \param alphaBits same as above.
 208  * \param numSamples not really used.
 209  *
 210  * \return pointer to new GLvisual or NULL if requested parameters can't be
 211  * met.
 212  *
 213  * \note Need to add params for level and numAuxBuffers (at least)
 214  */
 215 GLvisual *
 216 _mesa_create_visual( GLboolean rgbFlag,
 217                      GLboolean dbFlag,
 218                      GLboolean stereoFlag,
 219                      GLint redBits,
 220                      GLint greenBits,
 221                      GLint blueBits,
 222                      GLint alphaBits,
 223                      GLint indexBits,
 224                      GLint depthBits,
 225                      GLint stencilBits,
 226                      GLint accumRedBits,
 227                      GLint accumGreenBits,
 228                      GLint accumBlueBits,
 229                      GLint accumAlphaBits,
 230                      GLint numSamples )
 231 {
 232    GLvisual *vis = (GLvisual *) _mesa_calloc(sizeof(GLvisual));
 233    if (vis) {
 234       if (!_mesa_initialize_visual(vis, rgbFlag, dbFlag, stereoFlag,
 235                                    redBits, greenBits, blueBits, alphaBits,
 236                                    indexBits, depthBits, stencilBits,
 237                                    accumRedBits, accumGreenBits,
 238                                    accumBlueBits, accumAlphaBits,
 239                                    numSamples)) {
 240          _mesa_free(vis);
 241          return NULL;
 242       }
 243    }
 244    return vis;
 245 }
 246
 247 /**
 248  * Makes some sanity checks and fills in the fields of the
 249  * GLvisual object with the given parameters.  If the caller needs
 250  * to set additional fields, he should just probably init the whole GLvisual
 251  * object himself.
 252  * \return GL_TRUE on success, or GL_FALSE on failure.
 253  *
 254  * \sa _mesa_create_visual() above for the parameter description.
 255  */
 256 GLboolean
 257 _mesa_initialize_visual( GLvisual *vis,
 258                          GLboolean rgbFlag,
 259                          GLboolean dbFlag,
 260                          GLboolean stereoFlag,
 261                          GLint redBits,
 262                          GLint greenBits,
 263                          GLint blueBits,
 264                          GLint alphaBits,
 265                          GLint indexBits,
 266                          GLint depthBits,
 267                          GLint stencilBits,
 268                          GLint accumRedBits,
 269                          GLint accumGreenBits,
 270                          GLint accumBlueBits,
 271                          GLint accumAlphaBits,
 272                          GLint numSamples )
 273 {
 274    assert(vis);
 275
 276    if (depthBits < 0 || depthBits > 32) {
 277       return GL_FALSE;
 278    }
 279    if (stencilBits < 0 || stencilBits > STENCIL_BITS) {
 280       return GL_FALSE;
 281    }
 282    assert(accumRedBits >= 0);
 283    assert(accumGreenBits >= 0);
 284    assert(accumBlueBits >= 0);
 285    assert(accumAlphaBits >= 0);
 286
 287    vis->rgbMode          = rgbFlag;
 288    vis->doubleBufferMode = dbFlag;
 289    vis->stereoMode       = stereoFlag;
 290
 291    vis->redBits          = redBits;
 292    vis->greenBits        = greenBits;
 293    vis->blueBits         = blueBits;
 294    vis->alphaBits        = alphaBits;
 295    vis->rgbBits          = redBits + greenBits + blueBits;
 296
 297    vis->indexBits      = indexBits;
 298    vis->depthBits      = depthBits;
 299    vis->stencilBits    = stencilBits;
 300
 301    vis->accumRedBits   = accumRedBits;
 302    vis->accumGreenBits = accumGreenBits;
 303    vis->accumBlueBits  = accumBlueBits;
 304    vis->accumAlphaBits = accumAlphaBits;
 305
 306    vis->haveAccumBuffer   = accumRedBits > 0;
 307    vis->haveDepthBuffer   = depthBits > 0;
 308    vis->haveStencilBuffer = stencilBits > 0;
 309
 310    vis->numAuxBuffers = 0;
 311    vis->level = 0;
 312    vis->pixmapMode = 0;
 313    vis->sampleBuffers = numSamples > 0 ? 1 : 0;
 314    vis->samples = numSamples;
 315
 316    return GL_TRUE;
 317 }
 318
 319
 320 /**
 321  * Destroy a visual and free its memory.
 322  *
 323  * \param vis visual.
 324  *
 325  * Frees the visual structure.
 326  */
 327 void
 328 _mesa_destroy_visual( GLvisual *vis )
 329 {
 330    _mesa_free(vis);
 331 }
 332
 333 /*@}*/
 334
 335
 336 /**********************************************************************/
 337 /** \name Context allocation, initialization, destroying
 338  *
 339  * The purpose of the most initialization functions here is to provide the
 340  * default state values according to the OpenGL specification.
 341  */
 342 /**********************************************************************/
 343 /*@{*/
 344
 345
 346 /**
 347  * This is lame.  gdb only seems to recognize enum types that are
 348  * actually used somewhere.  We want to be able to print/use enum
 349  * values such as TEXTURE_2D_INDEX in gdb.  But we don't actually use
 350  * the gl_texture_index type anywhere.  Thus, this lame function.
 351  */
 352 static void
 353 dummy_enum_func(void)
 354 {
 355    gl_buffer_index bi;
 356    gl_colortable_index ci;
 357    gl_face_index fi;
 358    gl_frag_attrib fa;
 359    gl_frag_result fr;
 360    gl_texture_index ti;
 361    gl_vert_attrib va;
 362    gl_vert_result vr;
 363
 364    (void) bi;
 365    (void) ci;
 366    (void) fi;
 367    (void) fa;
 368    (void) fr;
 369    (void) ti;
 370    (void) va;
 371    (void) vr;
 372 }
 373
 374
 375 /**
 376  * One-time initialization mutex lock.
 377  *
 378  * \sa Used by one_time_init().
 379  */
 380 _glthread_DECLARE_STATIC_MUTEX(OneTimeLock);
 381
 382 /**
 383  * Calls all the various one-time-init functions in Mesa.
 384  *
 385  * While holding a global mutex lock, calls several initialization functions,
 386  * and sets the glapi callbacks if the \c MESA_DEBUG environment variable is
 387  * defined.
 388  *
 389  * \sa _math_init().
 390  */
 391 static void
 392 one_time_init( GLcontext *ctx )
 393 {
 394    static GLboolean alreadyCalled = GL_FALSE;
 395    (void) ctx;
 396    _glthread_LOCK_MUTEX(OneTimeLock);
 397    if (!alreadyCalled) {
 398       GLuint i;
 399
 400       /* do some implementation tests */
 401       assert( sizeof(GLbyte) == 1 );
 402       assert( sizeof(GLubyte) == 1 );
 403       assert( sizeof(GLshort) == 2 );
 404       assert( sizeof(GLushort) == 2 );
 405       assert( sizeof(GLint) == 4 );
 406       assert( sizeof(GLuint) == 4 );
 407
 408       _mesa_get_cpu_features();
 409
 410       _mesa_init_remap_table();
 411
 412       _mesa_init_sqrt_table();
 413
 414       for (i = 0; i < 256; i++) {
 415          _mesa_ubyte_to_float_color_tab[i] = (float) i / 255.0F;
 416       }
 417
 418       if (_mesa_getenv("MESA_DEBUG")) {
 419          _glapi_noop_enable_warnings(GL_TRUE);
 420          _glapi_set_warning_func( (_glapi_warning_func) _mesa_warning );
 421       }
 422       else {
 423          _glapi_noop_enable_warnings(GL_FALSE);
 424       }
 425
 426 #if defined(DEBUG) && defined(__DATE__) && defined(__TIME__)
 427       _mesa_debug(ctx, "Mesa %s DEBUG build %s %s\n",
 428                   MESA_VERSION_STRING, __DATE__, __TIME__);
 429 #endif
 430
 431       alreadyCalled = GL_TRUE;
 432    }
 433    _glthread_UNLOCK_MUTEX(OneTimeLock);
 434
 435    dummy_enum_func();
 436 }
 437
 438
 439 /**
 440  * Initialize fields of gl_current_attrib (aka ctx->Current.*)
 441  */
 442 static void
 443 _mesa_init_current(GLcontext *ctx)
 444 {
 445    GLuint i;
 446
 447    /* Init all to (0,0,0,1) */
 448    for (i = 0; i < Elements(ctx->Current.Attrib); i++) {
 449       ASSIGN_4V( ctx->Current.Attrib[i], 0.0, 0.0, 0.0, 1.0 );
 450    }
 451
 452    /* redo special cases: */
 453    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_WEIGHT], 1.0, 0.0, 0.0, 0.0 );
 454    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_NORMAL], 0.0, 0.0, 1.0, 1.0 );
 455    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_COLOR0], 1.0, 1.0, 1.0, 1.0 );
 456    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_COLOR1], 0.0, 0.0, 0.0, 1.0 );
 457    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_COLOR_INDEX], 1.0, 0.0, 0.0, 1.0 );
 458    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_EDGEFLAG], 1.0, 0.0, 0.0, 1.0 );
 459 }
 460
 461
 462 /**
 463  * Init vertex/fragment program limits.
 464  * Important: drivers should override these with actual limits.
 465  */
 466 static void
 467 init_program_limits(GLenum type, struct gl_program_constants *prog)
 468 {
 469    prog->MaxInstructions = MAX_PROGRAM_INSTRUCTIONS;
 470    prog->MaxAluInstructions = MAX_PROGRAM_INSTRUCTIONS;
 471    prog->MaxTexInstructions = MAX_PROGRAM_INSTRUCTIONS;
 472    prog->MaxTexIndirections = MAX_PROGRAM_INSTRUCTIONS;
 473    prog->MaxTemps = MAX_PROGRAM_TEMPS;
 474    prog->MaxEnvParams = MAX_PROGRAM_ENV_PARAMS;
 475    prog->MaxLocalParams = MAX_PROGRAM_LOCAL_PARAMS;
 476    prog->MaxUniformComponents = 4 * MAX_UNIFORMS;
 477
 478    if (type == GL_VERTEX_PROGRAM_ARB) {
 479       prog->MaxParameters = MAX_VERTEX_PROGRAM_PARAMS;
 480       prog->MaxAttribs = MAX_NV_VERTEX_PROGRAM_INPUTS;
 481       prog->MaxAddressRegs = MAX_VERTEX_PROGRAM_ADDRESS_REGS;
 482    }
 483    else {
 484       prog->MaxParameters = MAX_NV_FRAGMENT_PROGRAM_PARAMS;
 485       prog->MaxAttribs = MAX_NV_FRAGMENT_PROGRAM_INPUTS;
 486       prog->MaxAddressRegs = MAX_FRAGMENT_PROGRAM_ADDRESS_REGS;
 487    }
 488
 489    /* Set the native limits to zero.  This implies that there is no native
 490     * support for shaders.  Let the drivers fill in the actual values.
 491     */
 492    prog->MaxNativeInstructions = 0;
 493    prog->MaxNativeAluInstructions = 0;
 494    prog->MaxNativeTexInstructions = 0;
 495    prog->MaxNativeTexIndirections = 0;
 496    prog->MaxNativeAttribs = 0;
 497    prog->MaxNativeTemps = 0;
 498    prog->MaxNativeAddressRegs = 0;
 499    prog->MaxNativeParameters = 0;
 500 }
 501
 502
 503 /**
 504  * Initialize fields of gl_constants (aka ctx->Const.*).
 505  * Use defaults from config.h.  The device drivers will often override
 506  * some of these values (such as number of texture units).
 507  */
 508 static void
 509 _mesa_init_constants(GLcontext *ctx)
 510 {
 511    assert(ctx);
 512
 513    assert(MAX_TEXTURE_LEVELS >= MAX_3D_TEXTURE_LEVELS);
 514    assert(MAX_TEXTURE_LEVELS >= MAX_CUBE_TEXTURE_LEVELS);
 515
 516    /* Max texture size should be <= max viewport size (render to texture) */
 517    assert((1 << (MAX_TEXTURE_LEVELS - 1)) <= MAX_WIDTH);
 518
 519    /* Constants, may be overriden (usually only reduced) by device drivers */
 520    ctx->Const.MaxTextureLevels = MAX_TEXTURE_LEVELS;
 521    ctx->Const.Max3DTextureLevels = MAX_3D_TEXTURE_LEVELS;
 522    ctx->Const.MaxCubeTextureLevels = MAX_CUBE_TEXTURE_LEVELS;
 523    ctx->Const.MaxTextureRectSize = MAX_TEXTURE_RECT_SIZE;
 524    ctx->Const.MaxArrayTextureLayers = MAX_ARRAY_TEXTURE_LAYERS;
 525    ctx->Const.MaxTextureCoordUnits = MAX_TEXTURE_COORD_UNITS;
 526    ctx->Const.MaxTextureImageUnits = MAX_TEXTURE_IMAGE_UNITS;
 527    ctx->Const.MaxTextureUnits = MIN2(ctx->Const.MaxTextureCoordUnits,
 528                                      ctx->Const.MaxTextureImageUnits);
 529    ctx->Const.MaxTextureMaxAnisotropy = MAX_TEXTURE_MAX_ANISOTROPY;
 530    ctx->Const.MaxTextureLodBias = MAX_TEXTURE_LOD_BIAS;
 531    ctx->Const.MaxArrayLockSize = MAX_ARRAY_LOCK_SIZE;
 532    ctx->Const.SubPixelBits = SUB_PIXEL_BITS;
 533    ctx->Const.MinPointSize = MIN_POINT_SIZE;
 534    ctx->Const.MaxPointSize = MAX_POINT_SIZE;
 535    ctx->Const.MinPointSizeAA = MIN_POINT_SIZE;
 536    ctx->Const.MaxPointSizeAA = MAX_POINT_SIZE;
 537    ctx->Const.PointSizeGranularity = (GLfloat) POINT_SIZE_GRANULARITY;
 538    ctx->Const.MinLineWidth = MIN_LINE_WIDTH;
 539    ctx->Const.MaxLineWidth = MAX_LINE_WIDTH;
 540    ctx->Const.MinLineWidthAA = MIN_LINE_WIDTH;
 541    ctx->Const.MaxLineWidthAA = MAX_LINE_WIDTH;
 542    ctx->Const.LineWidthGranularity = (GLfloat) LINE_WIDTH_GRANULARITY;
 543    ctx->Const.MaxColorTableSize = MAX_COLOR_TABLE_SIZE;
 544    ctx->Const.MaxConvolutionWidth = MAX_CONVOLUTION_WIDTH;
 545    ctx->Const.MaxConvolutionHeight = MAX_CONVOLUTION_HEIGHT;
 546    ctx->Const.MaxClipPlanes = MAX_CLIP_PLANES;
 547    ctx->Const.MaxLights = MAX_LIGHTS;
 548    ctx->Const.MaxShininess = 128.0;
 549    ctx->Const.MaxSpotExponent = 128.0;
 550    ctx->Const.MaxViewportWidth = MAX_WIDTH;
 551    ctx->Const.MaxViewportHeight = MAX_HEIGHT;
 552 #if FEATURE_ARB_vertex_program
 553    init_program_limits(GL_VERTEX_PROGRAM_ARB, &ctx->Const.VertexProgram);
 554 #endif
 555 #if FEATURE_ARB_fragment_program
 556    init_program_limits(GL_FRAGMENT_PROGRAM_ARB, &ctx->Const.FragmentProgram);
 557 #endif
 558    ctx->Const.MaxProgramMatrices = MAX_PROGRAM_MATRICES;
 559    ctx->Const.MaxProgramMatrixStackDepth = MAX_PROGRAM_MATRIX_STACK_DEPTH;
 560
 561    /* CheckArrayBounds is overriden by drivers/x11 for X server */
 562    ctx->Const.CheckArrayBounds = GL_FALSE;
 563
 564    /* GL_ARB_draw_buffers */
 565    ctx->Const.MaxDrawBuffers = MAX_DRAW_BUFFERS;
 566
 567    /* GL_OES_read_format */
 568    ctx->Const.ColorReadFormat = GL_RGBA;
 569    ctx->Const.ColorReadType = GL_UNSIGNED_BYTE;
 570
 571 #if FEATURE_EXT_framebuffer_object
 572    ctx->Const.MaxColorAttachments = MAX_COLOR_ATTACHMENTS;
 573    ctx->Const.MaxRenderbufferSize = MAX_WIDTH;
 574 #endif
 575
 576 #if FEATURE_ARB_vertex_shader
 577    ctx->Const.MaxVertexTextureImageUnits = MAX_VERTEX_TEXTURE_IMAGE_UNITS;
 578    ctx->Const.MaxVarying = MAX_VARYING;
 579 #endif
 580
 581    /* GL_ARB_framebuffer_object */
 582    ctx->Const.MaxSamples = 0;
 583
 584    /* GL_ARB_sync */
 585    ctx->Const.MaxServerWaitTimeout = (GLuint64) ~0;
 586
 587    /* GL_ATI_envmap_bumpmap */
 588    ctx->Const.SupportedBumpUnits = SUPPORTED_ATI_BUMP_UNITS;
 589
 590    /* GL_EXT_provoking_vertex */
 591    ctx->Const.QuadsFollowProvokingVertexConvention = GL_TRUE;
 592
 593    /* sanity checks */
 594    ASSERT(ctx->Const.MaxTextureUnits == MIN2(ctx->Const.MaxTextureImageUnits,
 595                                              ctx->Const.MaxTextureCoordUnits));
 596    ASSERT(ctx->Const.FragmentProgram.MaxLocalParams <= MAX_PROGRAM_LOCAL_PARAMS);
 597    ASSERT(ctx->Const.VertexProgram.MaxLocalParams <= MAX_PROGRAM_LOCAL_PARAMS);
 598
 599    ASSERT(MAX_NV_FRAGMENT_PROGRAM_TEMPS <= MAX_PROGRAM_TEMPS);
 600    ASSERT(MAX_NV_VERTEX_PROGRAM_TEMPS <= MAX_PROGRAM_TEMPS);
 601    ASSERT(MAX_NV_VERTEX_PROGRAM_INPUTS <= VERT_ATTRIB_MAX);
 602    ASSERT(MAX_NV_VERTEX_PROGRAM_OUTPUTS <= VERT_RESULT_MAX);
 603
 604    /* check that we don't exceed various 32-bit bitfields */
 605    ASSERT(VERT_RESULT_MAX <= 32);
 606    ASSERT(FRAG_ATTRIB_MAX <= 32);
 607 }
 608
 609
 610 /**
 611  * Do some sanity checks on the limits/constants for the given context.
 612  * Only called the first time a context is bound.
 613  */
 614 static void
 615 check_context_limits(GLcontext *ctx)
 616 {
 617    /* Many context limits/constants are limited by the size of
 618     * internal arrays.
 619     */
 620    assert(ctx->Const.MaxTextureImageUnits <= MAX_TEXTURE_IMAGE_UNITS);
 621    assert(ctx->Const.MaxTextureCoordUnits <= MAX_TEXTURE_COORD_UNITS);
 622    assert(ctx->Const.MaxTextureUnits <= MAX_TEXTURE_IMAGE_UNITS);
 623    assert(ctx->Const.MaxTextureUnits <= MAX_TEXTURE_COORD_UNITS);
 624
 625    /* number of coord units cannot be greater than number of image units */
 626    assert(ctx->Const.MaxTextureCoordUnits <= ctx->Const.MaxTextureImageUnits);
 627
 628    assert(ctx->Const.MaxTextureLevels <= MAX_TEXTURE_LEVELS);
 629    assert(ctx->Const.Max3DTextureLevels <= MAX_3D_TEXTURE_LEVELS);
 630    assert(ctx->Const.MaxCubeTextureLevels <= MAX_CUBE_TEXTURE_LEVELS);
 631    assert(ctx->Const.MaxTextureRectSize <= MAX_TEXTURE_RECT_SIZE);
 632
 633    /* make sure largest texture image is <= MAX_WIDTH in size */
 634    assert((1 << (ctx->Const.MaxTextureLevels - 1)) <= MAX_WIDTH);
 635    assert((1 << (ctx->Const.MaxCubeTextureLevels - 1)) <= MAX_WIDTH);
 636    assert((1 << (ctx->Const.Max3DTextureLevels - 1)) <= MAX_WIDTH);
 637
 638    assert(ctx->Const.MaxViewportWidth <= MAX_WIDTH);
 639    assert(ctx->Const.MaxViewportHeight <= MAX_WIDTH);
 640
 641    assert(ctx->Const.MaxDrawBuffers <= MAX_DRAW_BUFFERS);
 642
 643    /* XXX probably add more tests */
 644 }
 645
 646
 647 /**
 648  * Initialize the attribute groups in a GL context.
 649  *
 650  * \param ctx GL context.
 651  *
 652  * Initializes all the attributes, calling the respective <tt>init*</tt>
 653  * functions for the more complex data structures.
 654  */
 655 static GLboolean
 656 init_attrib_groups(GLcontext *ctx)
 657 {
 658    assert(ctx);
 659
 660    /* Constants */
 661    _mesa_init_constants( ctx );
 662
 663    /* Extensions */
 664    _mesa_init_extensions( ctx );
 665
 666    /* Attribute Groups */
 667    _mesa_init_accum( ctx );
 668    _mesa_init_attrib( ctx );
 669    _mesa_init_buffer_objects( ctx );
 670    _mesa_init_color( ctx );
 671    _mesa_init_colortables( ctx );
 672    _mesa_init_current( ctx );
 673    _mesa_init_depth( ctx );
 674    _mesa_init_debug( ctx );
 675    _mesa_init_display_list( ctx );
 676    _mesa_init_eval( ctx );
 677    _mesa_init_fbobjects( ctx );
 678    _mesa_init_feedback( ctx );
 679    _mesa_init_fog( ctx );
 680    _mesa_init_histogram( ctx );
 681    _mesa_init_hint( ctx );
 682    _mesa_init_line( ctx );
 683    _mesa_init_lighting( ctx );
 684    _mesa_init_matrix( ctx );
 685    _mesa_init_multisample( ctx );
 686    _mesa_init_pixel( ctx );
 687    _mesa_init_pixelstore( ctx );
 688    _mesa_init_point( ctx );
 689    _mesa_init_polygon( ctx );
 690    _mesa_init_program( ctx );
 691    _mesa_init_queryobj( ctx );
 692 #if FEATURE_ARB_sync
 693    _mesa_init_sync( ctx );
 694 #endif
 695    _mesa_init_rastpos( ctx );
 696    _mesa_init_scissor( ctx );
 697    _mesa_init_shader_state( ctx );
 698    _mesa_init_stencil( ctx );
 699    _mesa_init_transform( ctx );
 700    _mesa_init_varray( ctx );
 701    _mesa_init_viewport( ctx );
 702
 703    if (!_mesa_init_texture( ctx ))
 704       return GL_FALSE;
 705
 706    _mesa_init_texture_s3tc( ctx );
 707
 708    /* Miscellaneous */
 709    ctx->NewState = _NEW_ALL;
 710    ctx->ErrorValue = (GLenum) GL_NO_ERROR;
 711    ctx->varying_vp_inputs = ~0;
 712
 713    return GL_TRUE;
 714 }
 715
 716
 717 /**
 718  * Update default objects in a GL context with respect to shared state.
 719  *
 720  * \param ctx GL context.
 721  *
 722  * Removes references to old default objects, (texture objects, program
 723  * objects, etc.) and changes to reference those from the current shared
 724  * state.
 725  */
 726 static GLboolean
 727 update_default_objects(GLcontext *ctx)
 728 {
 729    assert(ctx);
 730
 731    _mesa_update_default_objects_program(ctx);
 732    _mesa_update_default_objects_texture(ctx);
 733    _mesa_update_default_objects_buffer_objects(ctx);
 734
 735    return GL_TRUE;
 736 }
 737
 738
 739 /**
 740  * This is the default function we plug into all dispatch table slots
 741  * This helps prevents a segfault when someone calls a GL function without
 742  * first checking if the extension's supported.
 743  */
 744 static int
 745 generic_nop(void)
 746 {
 747    _mesa_warning(NULL, "User called no-op dispatch function (an unsupported extension function?)");
 748    return 0;
 749 }
 750
 751
 752 /**
 753  * Allocate and initialize a new dispatch table.
 754  */
 755 static struct _glapi_table *
 756 alloc_dispatch_table(void)
 757 {
 758    /* Find the larger of Mesa's dispatch table and libGL's dispatch table.
 759     * In practice, this'll be the same for stand-alone Mesa.  But for DRI
 760     * Mesa we do this to accomodate different versions of libGL and various
 761     * DRI drivers.
 762     */
 763    GLint numEntries = MAX2(_glapi_get_dispatch_table_size(),
 764                            sizeof(struct _glapi_table) / sizeof(_glapi_proc));
 765    struct _glapi_table *table =
 766       (struct _glapi_table *) _mesa_malloc(numEntries * sizeof(_glapi_proc));
 767    if (table) {
 768       _glapi_proc *entry = (_glapi_proc *) table;
 769       GLint i;
 770       for (i = 0; i < numEntries; i++) {
 771          entry[i] = (_glapi_proc) generic_nop;
 772       }
 773    }
 774    return table;
 775 }
 776
 777
 778 /**
 779  * Initialize a GLcontext struct (rendering context).
 780  *
 781  * This includes allocating all the other structs and arrays which hang off of
 782  * the context by pointers.
 783  * Note that the driver needs to pass in its dd_function_table here since
 784  * we need to at least call driverFunctions->NewTextureObject to create the
 785  * default texture objects.
 786  *
 787  * Called by _mesa_create_context().
 788  *
 789  * Performs the imports and exports callback tables initialization, and
 790  * miscellaneous one-time initializations. If no shared context is supplied one
 791  * is allocated, and increase its reference count.  Setups the GL API dispatch
 792  * tables.  Initialize the TNL module. Sets the maximum Z buffer depth.
 793  * Finally queries the \c MESA_DEBUG and \c MESA_VERBOSE environment variables
 794  * for debug flags.
 795  *
 796  * \param ctx the context to initialize
 797  * \param visual describes the visual attributes for this context
 798  * \param share_list points to context to share textures, display lists,
 799  *        etc with, or NULL
 800  * \param driverFunctions table of device driver functions for this context
 801  *        to use
 802  * \param driverContext pointer to driver-specific context data
 803  */
 804 GLboolean
 805 _mesa_initialize_context(GLcontext *ctx,
 806                          const GLvisual *visual,
 807                          GLcontext *share_list,
 808                          const struct dd_function_table *driverFunctions,
 809                          void *driverContext)
 810 {
 811    struct gl_shared_state *shared;
 812
 813    /*ASSERT(driverContext);*/
 814    assert(driverFunctions->NewTextureObject);
 815    assert(driverFunctions->FreeTexImageData);
 816
 817    /* misc one-time initializations */
 818    one_time_init(ctx);
 819
 820    ctx->Visual = *visual;
 821    ctx->DrawBuffer = NULL;
 822    ctx->ReadBuffer = NULL;
 823    ctx->WinSysDrawBuffer = NULL;
 824    ctx->WinSysReadBuffer = NULL;
 825
 826    /* Plug in driver functions and context pointer here.
 827     * This is important because when we call alloc_shared_state() below
 828     * we'll call ctx->Driver.NewTextureObject() to create the default
 829     * textures.
 830     */
 831    ctx->Driver = *driverFunctions;
 832    ctx->DriverCtx = driverContext;
 833
 834    if (share_list) {
 835       /* share state with another context */
 836       shared = share_list->Shared;
 837    }
 838    else {
 839       /* allocate new, unshared state */
 840       shared = _mesa_alloc_shared_state(ctx);
 841       if (!shared)
 842          return GL_FALSE;
 843    }
 844
 845    _glthread_LOCK_MUTEX(shared->Mutex);
 846    ctx->Shared = shared;
 847    shared->RefCount++;
 848    _glthread_UNLOCK_MUTEX(shared->Mutex);
 849
 850    if (!init_attrib_groups( ctx )) {
 851       _mesa_free_shared_state(ctx, ctx->Shared);
 852       return GL_FALSE;
 853    }
 854
 855    /* setup the API dispatch tables */
 856    ctx->Exec = alloc_dispatch_table();
 857    ctx->Save = alloc_dispatch_table();
 858    if (!ctx->Exec || !ctx->Save) {
 859       _mesa_free_shared_state(ctx, ctx->Shared);
 860       if (ctx->Exec)
 861          _mesa_free(ctx->Exec);
 862       return GL_FALSE;
 863    }
 864 #if FEATURE_dispatch
 865    _mesa_init_exec_table(ctx->Exec);
 866 #endif
 867    ctx->CurrentDispatch = ctx->Exec;
 868
 869 #if FEATURE_dlist
 870    _mesa_init_save_table(ctx->Save);
 871    _mesa_install_save_vtxfmt( ctx, &ctx->ListState.ListVtxfmt );
 872 #endif
 873
 874    /* Neutral tnl module stuff */
 875    _mesa_init_exec_vtxfmt( ctx );
 876    ctx->TnlModule.Current = NULL;
 877    ctx->TnlModule.SwapCount = 0;
 878
 879    ctx->FragmentProgram._MaintainTexEnvProgram
 880       = (_mesa_getenv("MESA_TEX_PROG") != NULL);
 881
 882    ctx->VertexProgram._MaintainTnlProgram
 883       = (_mesa_getenv("MESA_TNL_PROG") != NULL);
 884    if (ctx->VertexProgram._MaintainTnlProgram) {
 885       /* this is required... */
 886       ctx->FragmentProgram._MaintainTexEnvProgram = GL_TRUE;
 887    }
 888
 889 #ifdef FEATURE_extra_context_init
 890    _mesa_initialize_context_extra(ctx);
 891 #endif
 892
 893    ctx->FirstTimeCurrent = GL_TRUE;
 894
 895    return GL_TRUE;
 896 }
 897
 898
 899 /**
 900  * Allocate and initialize a GLcontext structure.
 901  * Note that the driver needs to pass in its dd_function_table here since
 902  * we need to at least call driverFunctions->NewTextureObject to initialize
 903  * the rendering context.
 904  *
 905  * \param visual a GLvisual pointer (we copy the struct contents)
 906  * \param share_list another context to share display lists with or NULL
 907  * \param driverFunctions points to the dd_function_table into which the
 908  *        driver has plugged in all its special functions.
 909  * \param driverContext points to the device driver's private context state
 910  *
 911  * \return pointer to a new __GLcontextRec or NULL if error.
 912  */
 913 GLcontext *
 914 _mesa_create_context(const GLvisual *visual,
 915                      GLcontext *share_list,
 916                      const struct dd_function_table *driverFunctions,
 917                      void *driverContext)
 918 {
 919    GLcontext *ctx;
 920
 921    ASSERT(visual);
 922    /*ASSERT(driverContext);*/
 923
 924    ctx = (GLcontext *) _mesa_calloc(sizeof(GLcontext));
 925    if (!ctx)
 926       return NULL;
 927
 928    if (_mesa_initialize_context(ctx, visual, share_list,
 929                                 driverFunctions, driverContext)) {
 930       return ctx;
 931    }
 932    else {
 933       _mesa_free(ctx);
 934       return NULL;
 935    }
 936 }
 937
 938
 939 /**
 940  * Free the data associated with the given context.
 941  *
 942  * But doesn't free the GLcontext struct itself.
 943  *
 944  * \sa _mesa_initialize_context() and init_attrib_groups().
 945  */
 946 void
 947 _mesa_free_context_data( GLcontext *ctx )
 948 {
 949    GLint RefCount;
 950
 951    if (!_mesa_get_current_context()){
 952       /* No current context, but we may need one in order to delete
 953        * texture objs, etc.  So temporarily bind the context now.
 954        */
 955       _mesa_make_current(ctx, NULL, NULL);
 956    }
 957
 958    /* unreference WinSysDraw/Read buffers */
 959    _mesa_reference_framebuffer(&ctx->WinSysDrawBuffer, NULL);
 960    _mesa_reference_framebuffer(&ctx->WinSysReadBuffer, NULL);
 961    _mesa_reference_framebuffer(&ctx->DrawBuffer, NULL);
 962    _mesa_reference_framebuffer(&ctx->ReadBuffer, NULL);
 963
 964    _mesa_reference_vertprog(ctx, &ctx->VertexProgram.Current, NULL);
 965    _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current, NULL);
 966    _mesa_reference_vertprog(ctx, &ctx->VertexProgram._TnlProgram, NULL);
 967
 968    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram.Current, NULL);
 969    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current, NULL);
 970    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram, NULL);
 971
 972    _mesa_free_attrib_data(ctx);
 973    _mesa_free_lighting_data( ctx );
 974    _mesa_free_eval_data( ctx );
 975    _mesa_free_texture_data( ctx );
 976    _mesa_free_matrix_data( ctx );
 977    _mesa_free_viewport_data( ctx );
 978    _mesa_free_colortables_data( ctx );
 979    _mesa_free_program_data(ctx);
 980    _mesa_free_shader_state(ctx);
 981    _mesa_free_queryobj_data(ctx);
 982 #if FEATURE_ARB_sync
 983    _mesa_free_sync_data(ctx);
 984 #endif
 985    _mesa_free_varray_data(ctx);
 986
 987    _mesa_delete_array_object(ctx, ctx->Array.DefaultArrayObj);
 988
 989 #if FEATURE_ARB_pixel_buffer_object
 990    _mesa_reference_buffer_object(ctx, &ctx->Pack.BufferObj, NULL);
 991    _mesa_reference_buffer_object(ctx, &ctx->Unpack.BufferObj, NULL);
 992 #endif
 993
 994 #if FEATURE_ARB_vertex_buffer_object
 995    _mesa_reference_buffer_object(ctx, &ctx->Array.ArrayBufferObj, NULL);
 996    _mesa_reference_buffer_object(ctx, &ctx->Array.ElementArrayBufferObj, NULL);
 997 #endif
 998
 999    /* free dispatch tables */
1000    _mesa_free(ctx->Exec);
1001    _mesa_free(ctx->Save);
1002
1003    /* Shared context state (display lists, textures, etc) */
1004    _glthread_LOCK_MUTEX(ctx->Shared->Mutex);
1005    RefCount = --ctx->Shared->RefCount;
1006    _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
1007    assert(RefCount >= 0);
1008    if (RefCount == 0) {
1009       /* free shared state */
1010       _mesa_free_shared_state( ctx, ctx->Shared );
1011    }
1012
1013    /* needs to be after freeing shared state */
1014    _mesa_free_display_list_data(ctx);
1015
1016    if (ctx->Extensions.String)
1017       _mesa_free((void *) ctx->Extensions.String);
1018
1019    /* unbind the context if it's currently bound */
1020    if (ctx == _mesa_get_current_context()) {
1021       _mesa_make_current(NULL, NULL, NULL);
1022    }
1023 }
1024
1025
1026 /**
1027  * Destroy a GLcontext structure.
1028  *
1029  * \param ctx GL context.
1030  *
1031  * Calls _mesa_free_context_data() and frees the GLcontext structure itself.
1032  */
1033 void
1034 _mesa_destroy_context( GLcontext *ctx )
1035 {
1036    if (ctx) {
1037       _mesa_free_context_data(ctx);
1038       _mesa_free( (void *) ctx );
1039    }
1040 }
1041
1042
1043 #if _HAVE_FULL_GL
1044 /**
1045  * Copy attribute groups from one context to another.
1046  *
1047  * \param src source context
1048  * \param dst destination context
1049  * \param mask bitwise OR of GL_*_BIT flags
1050  *
1051  * According to the bits specified in \p mask, copies the corresponding
1052  * attributes from \p src into \p dst.  For many of the attributes a simple \c
1053  * memcpy is not enough due to the existence of internal pointers in their data
1054  * structures.
1055  */
1056 void
1057 _mesa_copy_context( const GLcontext *src, GLcontext *dst, GLuint mask )
1058 {
1059    if (mask & GL_ACCUM_BUFFER_BIT) {
1060       /* OK to memcpy */
1061       dst->Accum = src->Accum;
1062    }
1063    if (mask & GL_COLOR_BUFFER_BIT) {
1064       /* OK to memcpy */
1065       dst->Color = src->Color;
1066    }
1067    if (mask & GL_CURRENT_BIT) {
1068       /* OK to memcpy */
1069       dst->Current = src->Current;
1070    }
1071    if (mask & GL_DEPTH_BUFFER_BIT) {
1072       /* OK to memcpy */
1073       dst->Depth = src->Depth;
1074    }
1075    if (mask & GL_ENABLE_BIT) {
1076       /* no op */
1077    }
1078    if (mask & GL_EVAL_BIT) {
1079       /* OK to memcpy */
1080       dst->Eval = src->Eval;
1081    }
1082    if (mask & GL_FOG_BIT) {
1083       /* OK to memcpy */
1084       dst->Fog = src->Fog;
1085    }
1086    if (mask & GL_HINT_BIT) {
1087       /* OK to memcpy */
1088       dst->Hint = src->Hint;
1089    }
1090    if (mask & GL_LIGHTING_BIT) {
1091       GLuint i;
1092       /* begin with memcpy */
1093       dst->Light = src->Light;
1094       /* fixup linked lists to prevent pointer insanity */
1095       make_empty_list( &(dst->Light.EnabledList) );
1096       for (i = 0; i < MAX_LIGHTS; i++) {
1097          if (dst->Light.Light[i].Enabled) {
1098             insert_at_tail(&(dst->Light.EnabledList), &(dst->Light.Light[i]));
1099          }
1100       }
1101    }
1102    if (mask & GL_LINE_BIT) {
1103       /* OK to memcpy */
1104       dst->Line = src->Line;
1105    }
1106    if (mask & GL_LIST_BIT) {
1107       /* OK to memcpy */
1108       dst->List = src->List;
1109    }
1110    if (mask & GL_PIXEL_MODE_BIT) {
1111       /* OK to memcpy */
1112       dst->Pixel = src->Pixel;
1113    }
1114    if (mask & GL_POINT_BIT) {
1115       /* OK to memcpy */
1116       dst->Point = src->Point;
1117    }
1118    if (mask & GL_POLYGON_BIT) {
1119       /* OK to memcpy */
1120       dst->Polygon = src->Polygon;
1121    }
1122    if (mask & GL_POLYGON_STIPPLE_BIT) {
1123       /* Use loop instead of MEMCPY due to problem with Portland Group's
1124        * C compiler.  Reported by John Stone.
1125        */
1126       GLuint i;
1127       for (i = 0; i < 32; i++) {
1128          dst->PolygonStipple[i] = src->PolygonStipple[i];
1129       }
1130    }
1131    if (mask & GL_SCISSOR_BIT) {
1132       /* OK to memcpy */
1133       dst->Scissor = src->Scissor;
1134    }
1135    if (mask & GL_STENCIL_BUFFER_BIT) {
1136       /* OK to memcpy */
1137       dst->Stencil = src->Stencil;
1138    }
1139    if (mask & GL_TEXTURE_BIT) {
1140       /* Cannot memcpy because of pointers */
1141       _mesa_copy_texture_state(src, dst);
1142    }
1143    if (mask & GL_TRANSFORM_BIT) {
1144       /* OK to memcpy */
1145       dst->Transform = src->Transform;
1146    }
1147    if (mask & GL_VIEWPORT_BIT) {
1148       /* Cannot use memcpy, because of pointers in GLmatrix _WindowMap */
1149       dst->Viewport.X = src->Viewport.X;
1150       dst->Viewport.Y = src->Viewport.Y;
1151       dst->Viewport.Width = src->Viewport.Width;
1152       dst->Viewport.Height = src->Viewport.Height;
1153       dst->Viewport.Near = src->Viewport.Near;
1154       dst->Viewport.Far = src->Viewport.Far;
1155       _math_matrix_copy(&dst->Viewport._WindowMap, &src->Viewport._WindowMap);
1156    }
1157
1158    /* XXX FIXME:  Call callbacks?
1159     */
1160    dst->NewState = _NEW_ALL;
1161 }
1162 #endif
1163
1164
1165 /**
1166  * Check if the given context can render into the given framebuffer
1167  * by checking visual attributes.
1168  *
1169  * Most of these tests could go away because Mesa is now pretty flexible
1170  * in terms of mixing rendering contexts with framebuffers.  As long
1171  * as RGB vs. CI mode agree, we're probably good.
1172  *
1173  * \return GL_TRUE if compatible, GL_FALSE otherwise.
1174  */
1175 static GLboolean
1176 check_compatible(const GLcontext *ctx, const GLframebuffer *buffer)
1177 {
1178    const GLvisual *ctxvis = &ctx->Visual;
1179    const GLvisual *bufvis = &buffer->Visual;
1180
1181    if (ctxvis == bufvis)
1182       return GL_TRUE;
1183
1184    if (ctxvis->rgbMode != bufvis->rgbMode)
1185       return GL_FALSE;
1186 #if 0
1187    /* disabling this fixes the fgl_glxgears pbuffer demo */
1188    if (ctxvis->doubleBufferMode && !bufvis->doubleBufferMode)
1189       return GL_FALSE;
1190 #endif
1191    if (ctxvis->stereoMode && !bufvis->stereoMode)
1192       return GL_FALSE;
1193    if (ctxvis->haveAccumBuffer && !bufvis->haveAccumBuffer)
1194       return GL_FALSE;
1195    if (ctxvis->haveDepthBuffer && !bufvis->haveDepthBuffer)
1196       return GL_FALSE;
1197    if (ctxvis->haveStencilBuffer && !bufvis->haveStencilBuffer)
1198       return GL_FALSE;
1199    if (ctxvis->redMask && ctxvis->redMask != bufvis->redMask)
1200       return GL_FALSE;
1201    if (ctxvis->greenMask && ctxvis->greenMask != bufvis->greenMask)
1202       return GL_FALSE;
1203    if (ctxvis->blueMask && ctxvis->blueMask != bufvis->blueMask)
1204       return GL_FALSE;
1205 #if 0
1206    /* disabled (see bug 11161) */
1207    if (ctxvis->depthBits && ctxvis->depthBits != bufvis->depthBits)
1208       return GL_FALSE;
1209 #endif
1210    if (ctxvis->stencilBits && ctxvis->stencilBits != bufvis->stencilBits)
1211       return GL_FALSE;
1212
1213    return GL_TRUE;
1214 }
1215
1216
1217 /**
1218  * Do one-time initialization for the given framebuffer.  Specifically,
1219  * ask the driver for the window's current size and update the framebuffer
1220  * object to match.
1221  * Really, the device driver should totally take care of this.
1222  */
1223 static void
1224 initialize_framebuffer_size(GLcontext *ctx, GLframebuffer *fb)
1225 {
1226    GLuint width, height;
1227    if (ctx->Driver.GetBufferSize) {
1228       ctx->Driver.GetBufferSize(fb, &width, &height);
1229       if (ctx->Driver.ResizeBuffers)
1230          ctx->Driver.ResizeBuffers(ctx, fb, width, height);
1231       fb->Initialized = GL_TRUE;
1232    }
1233 }
1234
1235
1236 /**
1237  * Check if the viewport/scissor size has not yet been initialized.
1238  * Initialize the size if the given width and height are non-zero.
1239  */
1240 void
1241 _mesa_check_init_viewport(GLcontext *ctx, GLuint width, GLuint height)
1242 {
1243    if (!ctx->ViewportInitialized && width > 0 && height > 0) {
1244       /* Note: set flag here, before calling _mesa_set_viewport(), to prevent
1245        * potential infinite recursion.
1246        */
1247       ctx->ViewportInitialized = GL_TRUE;
1248       _mesa_set_viewport(ctx, 0, 0, width, height);
1249       _mesa_set_scissor(ctx, 0, 0, width, height);
1250    }
1251 }
1252
1253
1254 /**
1255  * Bind the given context to the given drawBuffer and readBuffer and
1256  * make it the current context for the calling thread.
1257  * We'll render into the drawBuffer and read pixels from the
1258  * readBuffer (i.e. glRead/CopyPixels, glCopyTexImage, etc).
1259  *
1260  * We check that the context's and framebuffer's visuals are compatible
1261  * and return immediately if they're not.
1262  *
1263  * \param newCtx  the new GL context. If NULL then there will be no current GL
1264  *                context.
1265  * \param drawBuffer  the drawing framebuffer
1266  * \param readBuffer  the reading framebuffer
1267  */
1268 GLboolean
1269 _mesa_make_current( GLcontext *newCtx, GLframebuffer *drawBuffer,
1270                     GLframebuffer *readBuffer )
1271 {
1272    if (MESA_VERBOSE & VERBOSE_API)
1273       _mesa_debug(newCtx, "_mesa_make_current()\n");
1274
1275    /* Check that the context's and framebuffer's visuals are compatible.
1276     */
1277    if (newCtx && drawBuffer && newCtx->WinSysDrawBuffer != drawBuffer) {
1278       if (!check_compatible(newCtx, drawBuffer)) {
1279          _mesa_warning(newCtx,
1280               "MakeCurrent: incompatible visuals for context and drawbuffer");
1281          return GL_FALSE;
1282       }
1283    }
1284    if (newCtx && readBuffer && newCtx->WinSysReadBuffer != readBuffer) {
1285       if (!check_compatible(newCtx, readBuffer)) {
1286          _mesa_warning(newCtx,
1287               "MakeCurrent: incompatible visuals for context and readbuffer");
1288          return GL_FALSE;
1289       }
1290    }
1291
1292    /* We used to call _glapi_check_multithread() here.  Now do it in drivers */
1293    _glapi_set_context((void *) newCtx);
1294    ASSERT(_mesa_get_current_context() == newCtx);
1295
1296    if (!newCtx) {
1297       _glapi_set_dispatch(NULL);  /* none current */
1298    }
1299    else {
1300       _glapi_set_dispatch(newCtx->CurrentDispatch);
1301
1302       if (drawBuffer && readBuffer) {
1303          /* TODO: check if newCtx and buffer's visual match??? */
1304
1305          ASSERT(drawBuffer->Name == 0);
1306          ASSERT(readBuffer->Name == 0);
1307          _mesa_reference_framebuffer(&newCtx->WinSysDrawBuffer, drawBuffer);
1308          _mesa_reference_framebuffer(&newCtx->WinSysReadBuffer, readBuffer);
1309
1310          /*
1311           * Only set the context's Draw/ReadBuffer fields if they're NULL
1312           * or not bound to a user-created FBO.
1313           */
1314          if (!newCtx->DrawBuffer || newCtx->DrawBuffer->Name == 0) {
1315             /* KW: merge conflict here, revisit.
1316              */
1317             /* fix up the fb fields - these will end up wrong otherwise
1318              * if the DRIdrawable changes, and everything relies on them.
1319              * This is a bit messy (same as needed in _mesa_BindFramebufferEXT)
1320              */
1321             unsigned int i;
1322             GLenum buffers[MAX_DRAW_BUFFERS];
1323
1324             _mesa_reference_framebuffer(&newCtx->DrawBuffer, drawBuffer);
1325
1326             for(i = 0; i < newCtx->Const.MaxDrawBuffers; i++) {
1327                buffers[i] = newCtx->Color.DrawBuffer[i];
1328             }
1329
1330             _mesa_drawbuffers(newCtx, newCtx->Const.MaxDrawBuffers, buffers, NULL);
1331          }
1332          if (!newCtx->ReadBuffer || newCtx->ReadBuffer->Name == 0) {
1333             _mesa_reference_framebuffer(&newCtx->ReadBuffer, readBuffer);
1334          }
1335
1336          /* XXX only set this flag if we're really changing the draw/read
1337           * framebuffer bindings.
1338           */
1339          newCtx->NewState |= _NEW_BUFFERS;
1340
1341 #if 1
1342          /* We want to get rid of these lines: */
1343
1344 #if _HAVE_FULL_GL
1345          if (!drawBuffer->Initialized) {
1346             initialize_framebuffer_size(newCtx, drawBuffer);
1347          }
1348          if (readBuffer != drawBuffer && !readBuffer->Initialized) {
1349             initialize_framebuffer_size(newCtx, readBuffer);
1350          }
1351
1352          _mesa_resizebuffers(newCtx);
1353 #endif
1354
1355 #else
1356          /* We want the drawBuffer and readBuffer to be initialized by
1357           * the driver.
1358           * This generally means the Width and Height match the actual
1359           * window size and the renderbuffers (both hardware and software
1360           * based) are allocated to match.  The later can generally be
1361           * done with a call to _mesa_resize_framebuffer().
1362           *
1363           * It's theoretically possible for a buffer to have zero width
1364           * or height, but for now, assert check that the driver did what's
1365           * expected of it.
1366           */
1367          ASSERT(drawBuffer->Width > 0);
1368          ASSERT(drawBuffer->Height > 0);
1369 #endif
1370
1371          if (drawBuffer) {
1372             _mesa_check_init_viewport(newCtx,
1373                                       drawBuffer->Width, drawBuffer->Height);
1374          }
1375       }
1376
1377       if (newCtx->FirstTimeCurrent) {
1378          check_context_limits(newCtx);
1379
1380          /* We can use this to help debug user's problems.  Tell them to set
1381           * the MESA_INFO env variable before running their app.  Then the
1382           * first time each context is made current we'll print some useful
1383           * information.
1384           */
1385          if (_mesa_getenv("MESA_INFO")) {
1386             _mesa_print_info();
1387          }
1388
1389          newCtx->FirstTimeCurrent = GL_FALSE;
1390       }
1391    }
1392
1393    return GL_TRUE;
1394 }
1395
1396
1397 /**
1398  * Make context 'ctx' share the display lists, textures and programs
1399  * that are associated with 'ctxToShare'.
1400  * Any display lists, textures or programs associated with 'ctx' will
1401  * be deleted if nobody else is sharing them.
1402  */
1403 GLboolean
1404 _mesa_share_state(GLcontext *ctx, GLcontext *ctxToShare)
1405 {
1406    if (ctx && ctxToShare && ctx->Shared && ctxToShare->Shared) {
1407       struct gl_shared_state *oldSharedState = ctx->Shared;
1408       GLint RefCount;
1409
1410       ctx->Shared = ctxToShare->Shared;
1411
1412       _glthread_LOCK_MUTEX(ctx->Shared->Mutex);
1413       ctx->Shared->RefCount++;
1414       _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
1415
1416       update_default_objects(ctx);
1417
1418       _glthread_LOCK_MUTEX(oldSharedState->Mutex);
1419       RefCount = --oldSharedState->RefCount;
1420       _glthread_UNLOCK_MUTEX(oldSharedState->Mutex);
1421
1422       if (RefCount == 0) {
1423          _mesa_free_shared_state(ctx, oldSharedState);
1424       }
1425
1426       return GL_TRUE;
1427    }
1428    else {
1429       return GL_FALSE;
1430    }
1431 }
1432
1433
1434
1435 /**
1436  * \return pointer to the current GL context for this thread.
1437  *
1438  * Calls _glapi_get_context(). This isn't the fastest way to get the current
1439  * context.  If you need speed, see the #GET_CURRENT_CONTEXT macro in
1440  * context.h.
1441  */
1442 GLcontext *
1443 _mesa_get_current_context( void )
1444 {
1445    return (GLcontext *) _glapi_get_context();
1446 }
1447
1448
1449 /**
1450  * Get context's current API dispatch table.
1451  *
1452  * It'll either be the immediate-mode execute dispatcher or the display list
1453  * compile dispatcher.
1454  *
1455  * \param ctx GL context.
1456  *
1457  * \return pointer to dispatch_table.
1458  *
1459  * Simply returns __GLcontextRec::CurrentDispatch.
1460  */
1461 struct _glapi_table *
1462 _mesa_get_dispatch(GLcontext *ctx)
1463 {
1464    return ctx->CurrentDispatch;
1465 }
1466
1467 /*@}*/
1468
1469
1470 /**********************************************************************/
1471 /** \name Miscellaneous functions                                     */
1472 /**********************************************************************/
1473 /*@{*/
1474
1475 /**
1476  * Record an error.
1477  *
1478  * \param ctx GL context.
1479  * \param error error code.
1480  *
1481  * Records the given error code and call the driver's dd_function_table::Error
1482  * function if defined.
1483  *
1484  * \sa
1485  * This is called via _mesa_error().
1486  */
1487 void
1488 _mesa_record_error(GLcontext *ctx, GLenum error)
1489 {
1490    if (!ctx)
1491       return;
1492
1493    if (ctx->ErrorValue == GL_NO_ERROR) {
1494       ctx->ErrorValue = error;
1495    }
1496
1497    /* Call device driver's error handler, if any.  This is used on the Mac. */
1498    if (ctx->Driver.Error) {
1499       ctx->Driver.Error(ctx);
1500    }
1501 }
1502
1503
1504 /**
1505  * Flush commands and wait for completion.
1506  */
1507 void
1508 _mesa_finish(GLcontext *ctx)
1509 {
1510    FLUSH_CURRENT( ctx, 0 );
1511    if (ctx->Driver.Finish) {
1512       ctx->Driver.Finish(ctx);
1513    }
1514 }
1515
1516
1517 /**
1518  * Flush commands.
1519  */
1520 void
1521 _mesa_flush(GLcontext *ctx)
1522 {
1523    FLUSH_CURRENT( ctx, 0 );
1524    if (ctx->Driver.Flush) {
1525       ctx->Driver.Flush(ctx);
1526    }
1527 }
1528
1529
1530
1531 /**
1532  * Execute glFinish().
1533  *
1534  * Calls the #ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH macro and the
1535  * dd_function_table::Finish driver callback, if not NULL.
1536  */
1537 void GLAPIENTRY
1538 _mesa_Finish(void)
1539 {
1540    GET_CURRENT_CONTEXT(ctx);
1541    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
1542    _mesa_finish(ctx);
1543 }
1544
1545
1546 /**
1547  * Execute glFlush().
1548  *
1549  * Calls the #ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH macro and the
1550  * dd_function_table::Flush driver callback, if not NULL.
1551  */
1552 void GLAPIENTRY
1553 _mesa_Flush(void)
1554 {
1555    GET_CURRENT_CONTEXT(ctx);
1556    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
1557    _mesa_flush(ctx);
1558 }
1559
1560
1561 /**
1562  * Set mvp_with_dp4 flag.  If a driver has a preference for DP4 over
1563  * MUL/MAD, or vice versa, call this function to register that.
1564  * Otherwise we default to MUL/MAD.
1565  */
1566 void
1567 _mesa_set_mvp_with_dp4( GLcontext *ctx,
1568                         GLboolean flag )
1569 {
1570    ctx->mvp_with_dp4 = flag;
1571 }
1572
1573
1574
1575 /**
1576  * Prior to drawing anything with glBegin, glDrawArrays, etc. this function
1577  * is called to see if it's valid to render.  This involves checking that
1578  * the current shader is valid and the framebuffer is complete.
1579  * If an error is detected it'll be recorded here.
1580  * \return GL_TRUE if OK to render, GL_FALSE if not
1581  */
1582 GLboolean
1583 _mesa_valid_to_render(GLcontext *ctx, const char *where)
1584 {
1585    if (ctx->Shader.CurrentProgram) {
1586       /* using shaders */
1587       if (!ctx->Shader.CurrentProgram->LinkStatus) {
1588          _mesa_error(ctx, GL_INVALID_OPERATION,
1589                      "%s(shader not linked), where");
1590          return GL_FALSE;
1591       }
1592 #if 0 /* not normally enabled */
1593       {
1594          char errMsg[100];
1595          if (!_mesa_validate_shader_program(ctx, ctx->Shader.CurrentProgram,
1596                                             errMsg)) {
1597             _mesa_warning(ctx, "Shader program %u is invalid: %s",
1598                           ctx->Shader.CurrentProgram->Name, errMsg);
1599          }
1600       }
1601 #endif
1602    }
1603    else {
1604       if (ctx->VertexProgram.Enabled && !ctx->VertexProgram._Enabled) {
1605          _mesa_error(ctx, GL_INVALID_OPERATION,
1606                      "%s(vertex program not valid)", where);
1607          return GL_FALSE;
1608       }
1609       if (ctx->FragmentProgram.Enabled && !ctx->FragmentProgram._Enabled) {
1610          _mesa_error(ctx, GL_INVALID_OPERATION,
1611                      "%s(fragment program not valid)", where);
1612          return GL_FALSE;
1613       }
1614    }
1615
1616    if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
1617       _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
1618                   "%s(incomplete framebuffer)", where);
1619       return GL_FALSE;
1620    }
1621
1622 #ifdef DEBUG
1623    if (ctx->Shader.Flags & GLSL_LOG) {
1624       struct gl_shader_program *shProg = ctx->Shader.CurrentProgram;
1625       if (shProg) {
1626          if (!shProg->_Used) {
1627             /* This is the first time this shader is being used.
1628              * Append shader's constants/uniforms to log file.
1629              */
1630             GLuint i;
1631             for (i = 0; i < shProg->NumShaders; i++) {
1632                struct gl_shader *sh = shProg->Shaders[i];
1633                if (sh->Type == GL_VERTEX_SHADER) {
1634                   _mesa_append_uniforms_to_file(sh,
1635                                                 &shProg->VertexProgram->Base);
1636                }
1637                else if (sh->Type == GL_FRAGMENT_SHADER) {
1638                   _mesa_append_uniforms_to_file(sh,
1639                                                 &shProg->FragmentProgram->Base);
1640                }
1641             }
1642             shProg->_Used = GL_TRUE;
1643          }
1644       }
1645    }
1646 #endif
1647
1648    return GL_TRUE;
1649 }
1650
1651
1652 /*@}*/