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 #if FEATURE_EXT_framebuffer_object
 568    ctx->Const.MaxColorAttachments = MAX_COLOR_ATTACHMENTS;
 569    ctx->Const.MaxRenderbufferSize = MAX_WIDTH;
 570 #endif
 571
 572 #if FEATURE_ARB_vertex_shader
 573    ctx->Const.MaxVertexTextureImageUnits = MAX_VERTEX_TEXTURE_IMAGE_UNITS;
 574    ctx->Const.MaxCombinedTextureImageUnits = MAX_COMBINED_TEXTURE_IMAGE_UNITS;
 575    ctx->Const.MaxVarying = MAX_VARYING;
 576 #endif
 577
 578    /* GL_ARB_framebuffer_object */
 579    ctx->Const.MaxSamples = 0;
 580
 581    /* GL_ARB_sync */
 582    ctx->Const.MaxServerWaitTimeout = (GLuint64) ~0;
 583
 584    /* GL_ATI_envmap_bumpmap */
 585    ctx->Const.SupportedBumpUnits = SUPPORTED_ATI_BUMP_UNITS;
 586
 587    /* GL_EXT_provoking_vertex */
 588    ctx->Const.QuadsFollowProvokingVertexConvention = GL_TRUE;
 589
 590    /* sanity checks */
 591    ASSERT(ctx->Const.MaxTextureUnits == MIN2(ctx->Const.MaxTextureImageUnits,
 592                                              ctx->Const.MaxTextureCoordUnits));
 593    ASSERT(ctx->Const.FragmentProgram.MaxLocalParams <= MAX_PROGRAM_LOCAL_PARAMS);
 594    ASSERT(ctx->Const.VertexProgram.MaxLocalParams <= MAX_PROGRAM_LOCAL_PARAMS);
 595
 596    ASSERT(MAX_NV_FRAGMENT_PROGRAM_TEMPS <= MAX_PROGRAM_TEMPS);
 597    ASSERT(MAX_NV_VERTEX_PROGRAM_TEMPS <= MAX_PROGRAM_TEMPS);
 598    ASSERT(MAX_NV_VERTEX_PROGRAM_INPUTS <= VERT_ATTRIB_MAX);
 599    ASSERT(MAX_NV_VERTEX_PROGRAM_OUTPUTS <= VERT_RESULT_MAX);
 600
 601    /* check that we don't exceed the size of various bitfields */
 602    ASSERT(VERT_RESULT_MAX <=
 603           (8 * sizeof(ctx->VertexProgram._Current->Base.OutputsWritten)));
 604    ASSERT(FRAG_ATTRIB_MAX <=
 605           (8 * sizeof(ctx->FragmentProgram._Current->Base.InputsRead)));
 606 }
 607
 608
 609 /**
 610  * Do some sanity checks on the limits/constants for the given context.
 611  * Only called the first time a context is bound.
 612  */
 613 static void
 614 check_context_limits(GLcontext *ctx)
 615 {
 616    /* Many context limits/constants are limited by the size of
 617     * internal arrays.
 618     */
 619    assert(ctx->Const.MaxTextureImageUnits <= MAX_TEXTURE_IMAGE_UNITS);
 620    assert(ctx->Const.MaxTextureCoordUnits <= MAX_TEXTURE_COORD_UNITS);
 621    assert(ctx->Const.MaxTextureUnits <= MAX_TEXTURE_IMAGE_UNITS);
 622    assert(ctx->Const.MaxTextureUnits <= MAX_TEXTURE_COORD_UNITS);
 623
 624    /* number of coord units cannot be greater than number of image units */
 625    assert(ctx->Const.MaxTextureCoordUnits <= ctx->Const.MaxTextureImageUnits);
 626
 627    assert(ctx->Const.MaxTextureLevels <= MAX_TEXTURE_LEVELS);
 628    assert(ctx->Const.Max3DTextureLevels <= MAX_3D_TEXTURE_LEVELS);
 629    assert(ctx->Const.MaxCubeTextureLevels <= MAX_CUBE_TEXTURE_LEVELS);
 630    assert(ctx->Const.MaxTextureRectSize <= MAX_TEXTURE_RECT_SIZE);
 631
 632    /* make sure largest texture image is <= MAX_WIDTH in size */
 633    assert((1 << (ctx->Const.MaxTextureLevels - 1)) <= MAX_WIDTH);
 634    assert((1 << (ctx->Const.MaxCubeTextureLevels - 1)) <= MAX_WIDTH);
 635    assert((1 << (ctx->Const.Max3DTextureLevels - 1)) <= MAX_WIDTH);
 636
 637    assert(ctx->Const.MaxViewportWidth <= MAX_WIDTH);
 638    assert(ctx->Const.MaxViewportHeight <= MAX_WIDTH);
 639
 640    assert(ctx->Const.MaxDrawBuffers <= MAX_DRAW_BUFFERS);
 641
 642    /* XXX probably add more tests */
 643 }
 644
 645
 646 /**
 647  * Initialize the attribute groups in a GL context.
 648  *
 649  * \param ctx GL context.
 650  *
 651  * Initializes all the attributes, calling the respective <tt>init*</tt>
 652  * functions for the more complex data structures.
 653  */
 654 static GLboolean
 655 init_attrib_groups(GLcontext *ctx)
 656 {
 657    assert(ctx);
 658
 659    /* Constants */
 660    _mesa_init_constants( ctx );
 661
 662    /* Extensions */
 663    _mesa_init_extensions( ctx );
 664
 665    /* Attribute Groups */
 666    _mesa_init_accum( ctx );
 667    _mesa_init_attrib( ctx );
 668    _mesa_init_buffer_objects( ctx );
 669    _mesa_init_color( ctx );
 670    _mesa_init_colortables( ctx );
 671    _mesa_init_current( ctx );
 672    _mesa_init_depth( ctx );
 673    _mesa_init_debug( ctx );
 674    _mesa_init_display_list( ctx );
 675    _mesa_init_eval( ctx );
 676    _mesa_init_fbobjects( ctx );
 677    _mesa_init_feedback( ctx );
 678    _mesa_init_fog( ctx );
 679    _mesa_init_histogram( ctx );
 680    _mesa_init_hint( ctx );
 681    _mesa_init_line( ctx );
 682    _mesa_init_lighting( ctx );
 683    _mesa_init_matrix( ctx );
 684    _mesa_init_multisample( ctx );
 685    _mesa_init_pixel( ctx );
 686    _mesa_init_pixelstore( ctx );
 687    _mesa_init_point( ctx );
 688    _mesa_init_polygon( ctx );
 689    _mesa_init_program( ctx );
 690    _mesa_init_queryobj( ctx );
 691 #if FEATURE_ARB_sync
 692    _mesa_init_sync( ctx );
 693 #endif
 694    _mesa_init_rastpos( ctx );
 695    _mesa_init_scissor( ctx );
 696    _mesa_init_shader_state( ctx );
 697    _mesa_init_stencil( ctx );
 698    _mesa_init_transform( ctx );
 699    _mesa_init_varray( ctx );
 700    _mesa_init_viewport( ctx );
 701
 702    if (!_mesa_init_texture( ctx ))
 703       return GL_FALSE;
 704
 705    _mesa_init_texture_s3tc( ctx );
 706
 707    /* Miscellaneous */
 708    ctx->NewState = _NEW_ALL;
 709    ctx->ErrorValue = (GLenum) GL_NO_ERROR;
 710    ctx->varying_vp_inputs = ~0;
 711
 712    return GL_TRUE;
 713 }
 714
 715
 716 /**
 717  * Update default objects in a GL context with respect to shared state.
 718  *
 719  * \param ctx GL context.
 720  *
 721  * Removes references to old default objects, (texture objects, program
 722  * objects, etc.) and changes to reference those from the current shared
 723  * state.
 724  */
 725 static GLboolean
 726 update_default_objects(GLcontext *ctx)
 727 {
 728    assert(ctx);
 729
 730    _mesa_update_default_objects_program(ctx);
 731    _mesa_update_default_objects_texture(ctx);
 732    _mesa_update_default_objects_buffer_objects(ctx);
 733
 734    return GL_TRUE;
 735 }
 736
 737
 738 /**
 739  * This is the default function we plug into all dispatch table slots
 740  * This helps prevents a segfault when someone calls a GL function without
 741  * first checking if the extension's supported.
 742  */
 743 static int
 744 generic_nop(void)
 745 {
 746    _mesa_warning(NULL, "User called no-op dispatch function (an unsupported extension function?)");
 747    return 0;
 748 }
 749
 750
 751 /**
 752  * Allocate and initialize a new dispatch table.
 753  */
 754 static struct _glapi_table *
 755 alloc_dispatch_table(void)
 756 {
 757    /* Find the larger of Mesa's dispatch table and libGL's dispatch table.
 758     * In practice, this'll be the same for stand-alone Mesa.  But for DRI
 759     * Mesa we do this to accomodate different versions of libGL and various
 760     * DRI drivers.
 761     */
 762    GLint numEntries = MAX2(_glapi_get_dispatch_table_size(),
 763                            sizeof(struct _glapi_table) / sizeof(_glapi_proc));
 764    struct _glapi_table *table =
 765       (struct _glapi_table *) _mesa_malloc(numEntries * sizeof(_glapi_proc));
 766    if (table) {
 767       _glapi_proc *entry = (_glapi_proc *) table;
 768       GLint i;
 769       for (i = 0; i < numEntries; i++) {
 770          entry[i] = (_glapi_proc) generic_nop;
 771       }
 772    }
 773    return table;
 774 }
 775
 776
 777 /**
 778  * Initialize a GLcontext struct (rendering context).
 779  *
 780  * This includes allocating all the other structs and arrays which hang off of
 781  * the context by pointers.
 782  * Note that the driver needs to pass in its dd_function_table here since
 783  * we need to at least call driverFunctions->NewTextureObject to create the
 784  * default texture objects.
 785  *
 786  * Called by _mesa_create_context().
 787  *
 788  * Performs the imports and exports callback tables initialization, and
 789  * miscellaneous one-time initializations. If no shared context is supplied one
 790  * is allocated, and increase its reference count.  Setups the GL API dispatch
 791  * tables.  Initialize the TNL module. Sets the maximum Z buffer depth.
 792  * Finally queries the \c MESA_DEBUG and \c MESA_VERBOSE environment variables
 793  * for debug flags.
 794  *
 795  * \param ctx the context to initialize
 796  * \param visual describes the visual attributes for this context
 797  * \param share_list points to context to share textures, display lists,
 798  *        etc with, or NULL
 799  * \param driverFunctions table of device driver functions for this context
 800  *        to use
 801  * \param driverContext pointer to driver-specific context data
 802  */
 803 GLboolean
 804 _mesa_initialize_context(GLcontext *ctx,
 805                          const GLvisual *visual,
 806                          GLcontext *share_list,
 807                          const struct dd_function_table *driverFunctions,
 808                          void *driverContext)
 809 {
 810    struct gl_shared_state *shared;
 811
 812    /*ASSERT(driverContext);*/
 813    assert(driverFunctions->NewTextureObject);
 814    assert(driverFunctions->FreeTexImageData);
 815
 816    /* misc one-time initializations */
 817    one_time_init(ctx);
 818
 819    ctx->Visual = *visual;
 820    ctx->DrawBuffer = NULL;
 821    ctx->ReadBuffer = NULL;
 822    ctx->WinSysDrawBuffer = NULL;
 823    ctx->WinSysReadBuffer = NULL;
 824
 825    /* Plug in driver functions and context pointer here.
 826     * This is important because when we call alloc_shared_state() below
 827     * we'll call ctx->Driver.NewTextureObject() to create the default
 828     * textures.
 829     */
 830    ctx->Driver = *driverFunctions;
 831    ctx->DriverCtx = driverContext;
 832
 833    if (share_list) {
 834       /* share state with another context */
 835       shared = share_list->Shared;
 836    }
 837    else {
 838       /* allocate new, unshared state */
 839       shared = _mesa_alloc_shared_state(ctx);
 840       if (!shared)
 841          return GL_FALSE;
 842    }
 843
 844    _glthread_LOCK_MUTEX(shared->Mutex);
 845    ctx->Shared = shared;
 846    shared->RefCount++;
 847    _glthread_UNLOCK_MUTEX(shared->Mutex);
 848
 849    if (!init_attrib_groups( ctx )) {
 850       _mesa_free_shared_state(ctx, ctx->Shared);
 851       return GL_FALSE;
 852    }
 853
 854    /* setup the API dispatch tables */
 855    ctx->Exec = alloc_dispatch_table();
 856    ctx->Save = alloc_dispatch_table();
 857    if (!ctx->Exec || !ctx->Save) {
 858       _mesa_free_shared_state(ctx, ctx->Shared);
 859       if (ctx->Exec)
 860          _mesa_free(ctx->Exec);
 861       return GL_FALSE;
 862    }
 863 #if FEATURE_dispatch
 864    _mesa_init_exec_table(ctx->Exec);
 865 #endif
 866    ctx->CurrentDispatch = ctx->Exec;
 867
 868 #if FEATURE_dlist
 869    _mesa_init_save_table(ctx->Save);
 870    _mesa_install_save_vtxfmt( ctx, &ctx->ListState.ListVtxfmt );
 871 #endif
 872
 873    /* Neutral tnl module stuff */
 874    _mesa_init_exec_vtxfmt( ctx );
 875    ctx->TnlModule.Current = NULL;
 876    ctx->TnlModule.SwapCount = 0;
 877
 878    ctx->FragmentProgram._MaintainTexEnvProgram
 879       = (_mesa_getenv("MESA_TEX_PROG") != NULL);
 880
 881    ctx->VertexProgram._MaintainTnlProgram
 882       = (_mesa_getenv("MESA_TNL_PROG") != NULL);
 883    if (ctx->VertexProgram._MaintainTnlProgram) {
 884       /* this is required... */
 885       ctx->FragmentProgram._MaintainTexEnvProgram = GL_TRUE;
 886    }
 887
 888 #ifdef FEATURE_extra_context_init
 889    _mesa_initialize_context_extra(ctx);
 890 #endif
 891
 892    ctx->FirstTimeCurrent = GL_TRUE;
 893
 894    return GL_TRUE;
 895 }
 896
 897
 898 /**
 899  * Allocate and initialize a GLcontext structure.
 900  * Note that the driver needs to pass in its dd_function_table here since
 901  * we need to at least call driverFunctions->NewTextureObject to initialize
 902  * the rendering context.
 903  *
 904  * \param visual a GLvisual pointer (we copy the struct contents)
 905  * \param share_list another context to share display lists with or NULL
 906  * \param driverFunctions points to the dd_function_table into which the
 907  *        driver has plugged in all its special functions.
 908  * \param driverContext points to the device driver's private context state
 909  *
 910  * \return pointer to a new __GLcontextRec or NULL if error.
 911  */
 912 GLcontext *
 913 _mesa_create_context(const GLvisual *visual,
 914                      GLcontext *share_list,
 915                      const struct dd_function_table *driverFunctions,
 916                      void *driverContext)
 917 {
 918    GLcontext *ctx;
 919
 920    ASSERT(visual);
 921    /*ASSERT(driverContext);*/
 922
 923    ctx = (GLcontext *) _mesa_calloc(sizeof(GLcontext));
 924    if (!ctx)
 925       return NULL;
 926
 927    if (_mesa_initialize_context(ctx, visual, share_list,
 928                                 driverFunctions, driverContext)) {
 929       return ctx;
 930    }
 931    else {
 932       _mesa_free(ctx);
 933       return NULL;
 934    }
 935 }
 936
 937
 938 /**
 939  * Free the data associated with the given context.
 940  *
 941  * But doesn't free the GLcontext struct itself.
 942  *
 943  * \sa _mesa_initialize_context() and init_attrib_groups().
 944  */
 945 void
 946 _mesa_free_context_data( GLcontext *ctx )
 947 {
 948    GLint RefCount;
 949
 950    if (!_mesa_get_current_context()){
 951       /* No current context, but we may need one in order to delete
 952        * texture objs, etc.  So temporarily bind the context now.
 953        */
 954       _mesa_make_current(ctx, NULL, NULL);
 955    }
 956
 957    /* unreference WinSysDraw/Read buffers */
 958    _mesa_reference_framebuffer(&ctx->WinSysDrawBuffer, NULL);
 959    _mesa_reference_framebuffer(&ctx->WinSysReadBuffer, NULL);
 960    _mesa_reference_framebuffer(&ctx->DrawBuffer, NULL);
 961    _mesa_reference_framebuffer(&ctx->ReadBuffer, NULL);
 962
 963    _mesa_reference_vertprog(ctx, &ctx->VertexProgram.Current, NULL);
 964    _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current, NULL);
 965    _mesa_reference_vertprog(ctx, &ctx->VertexProgram._TnlProgram, NULL);
 966
 967    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram.Current, NULL);
 968    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current, NULL);
 969    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram, NULL);
 970
 971    _mesa_free_attrib_data(ctx);
 972    _mesa_free_lighting_data( ctx );
 973    _mesa_free_eval_data( ctx );
 974    _mesa_free_texture_data( ctx );
 975    _mesa_free_matrix_data( ctx );
 976    _mesa_free_viewport_data( ctx );
 977    _mesa_free_colortables_data( ctx );
 978    _mesa_free_program_data(ctx);
 979    _mesa_free_shader_state(ctx);
 980    _mesa_free_queryobj_data(ctx);
 981 #if FEATURE_ARB_sync
 982    _mesa_free_sync_data(ctx);
 983 #endif
 984    _mesa_free_varray_data(ctx);
 985
 986    _mesa_delete_array_object(ctx, ctx->Array.DefaultArrayObj);
 987
 988 #if FEATURE_ARB_pixel_buffer_object
 989    _mesa_reference_buffer_object(ctx, &ctx->Pack.BufferObj, NULL);
 990    _mesa_reference_buffer_object(ctx, &ctx->Unpack.BufferObj, NULL);
 991 #endif
 992
 993 #if FEATURE_ARB_vertex_buffer_object
 994    _mesa_reference_buffer_object(ctx, &ctx->Array.ArrayBufferObj, NULL);
 995    _mesa_reference_buffer_object(ctx, &ctx->Array.ElementArrayBufferObj, NULL);
 996 #endif
 997
 998    /* free dispatch tables */
 999    _mesa_free(ctx->Exec);
1000    _mesa_free(ctx->Save);
1001
1002    /* Shared context state (display lists, textures, etc) */
1003    _glthread_LOCK_MUTEX(ctx->Shared->Mutex);
1004    RefCount = --ctx->Shared->RefCount;
1005    _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
1006    assert(RefCount >= 0);
1007    if (RefCount == 0) {
1008       /* free shared state */
1009       _mesa_free_shared_state( ctx, ctx->Shared );
1010    }
1011
1012    /* needs to be after freeing shared state */
1013    _mesa_free_display_list_data(ctx);
1014
1015    if (ctx->Extensions.String)
1016       _mesa_free((void *) ctx->Extensions.String);
1017
1018    /* unbind the context if it's currently bound */
1019    if (ctx == _mesa_get_current_context()) {
1020       _mesa_make_current(NULL, NULL, NULL);
1021    }
1022 }
1023
1024
1025 /**
1026  * Destroy a GLcontext structure.
1027  *
1028  * \param ctx GL context.
1029  *
1030  * Calls _mesa_free_context_data() and frees the GLcontext structure itself.
1031  */
1032 void
1033 _mesa_destroy_context( GLcontext *ctx )
1034 {
1035    if (ctx) {
1036       _mesa_free_context_data(ctx);
1037       _mesa_free( (void *) ctx );
1038    }
1039 }
1040
1041
1042 #if _HAVE_FULL_GL
1043 /**
1044  * Copy attribute groups from one context to another.
1045  *
1046  * \param src source context
1047  * \param dst destination context
1048  * \param mask bitwise OR of GL_*_BIT flags
1049  *
1050  * According to the bits specified in \p mask, copies the corresponding
1051  * attributes from \p src into \p dst.  For many of the attributes a simple \c
1052  * memcpy is not enough due to the existence of internal pointers in their data
1053  * structures.
1054  */
1055 void
1056 _mesa_copy_context( const GLcontext *src, GLcontext *dst, GLuint mask )
1057 {
1058    if (mask & GL_ACCUM_BUFFER_BIT) {
1059       /* OK to memcpy */
1060       dst->Accum = src->Accum;
1061    }
1062    if (mask & GL_COLOR_BUFFER_BIT) {
1063       /* OK to memcpy */
1064       dst->Color = src->Color;
1065    }
1066    if (mask & GL_CURRENT_BIT) {
1067       /* OK to memcpy */
1068       dst->Current = src->Current;
1069    }
1070    if (mask & GL_DEPTH_BUFFER_BIT) {
1071       /* OK to memcpy */
1072       dst->Depth = src->Depth;
1073    }
1074    if (mask & GL_ENABLE_BIT) {
1075       /* no op */
1076    }
1077    if (mask & GL_EVAL_BIT) {
1078       /* OK to memcpy */
1079       dst->Eval = src->Eval;
1080    }
1081    if (mask & GL_FOG_BIT) {
1082       /* OK to memcpy */
1083       dst->Fog = src->Fog;
1084    }
1085    if (mask & GL_HINT_BIT) {
1086       /* OK to memcpy */
1087       dst->Hint = src->Hint;
1088    }
1089    if (mask & GL_LIGHTING_BIT) {
1090       GLuint i;
1091       /* begin with memcpy */
1092       dst->Light = src->Light;
1093       /* fixup linked lists to prevent pointer insanity */
1094       make_empty_list( &(dst->Light.EnabledList) );
1095       for (i = 0; i < MAX_LIGHTS; i++) {
1096          if (dst->Light.Light[i].Enabled) {
1097             insert_at_tail(&(dst->Light.EnabledList), &(dst->Light.Light[i]));
1098          }
1099       }
1100    }
1101    if (mask & GL_LINE_BIT) {
1102       /* OK to memcpy */
1103       dst->Line = src->Line;
1104    }
1105    if (mask & GL_LIST_BIT) {
1106       /* OK to memcpy */
1107       dst->List = src->List;
1108    }
1109    if (mask & GL_PIXEL_MODE_BIT) {
1110       /* OK to memcpy */
1111       dst->Pixel = src->Pixel;
1112    }
1113    if (mask & GL_POINT_BIT) {
1114       /* OK to memcpy */
1115       dst->Point = src->Point;
1116    }
1117    if (mask & GL_POLYGON_BIT) {
1118       /* OK to memcpy */
1119       dst->Polygon = src->Polygon;
1120    }
1121    if (mask & GL_POLYGON_STIPPLE_BIT) {
1122       /* Use loop instead of MEMCPY due to problem with Portland Group's
1123        * C compiler.  Reported by John Stone.
1124        */
1125       GLuint i;
1126       for (i = 0; i < 32; i++) {
1127          dst->PolygonStipple[i] = src->PolygonStipple[i];
1128       }
1129    }
1130    if (mask & GL_SCISSOR_BIT) {
1131       /* OK to memcpy */
1132       dst->Scissor = src->Scissor;
1133    }
1134    if (mask & GL_STENCIL_BUFFER_BIT) {
1135       /* OK to memcpy */
1136       dst->Stencil = src->Stencil;
1137    }
1138    if (mask & GL_TEXTURE_BIT) {
1139       /* Cannot memcpy because of pointers */
1140       _mesa_copy_texture_state(src, dst);
1141    }
1142    if (mask & GL_TRANSFORM_BIT) {
1143       /* OK to memcpy */
1144       dst->Transform = src->Transform;
1145    }
1146    if (mask & GL_VIEWPORT_BIT) {
1147       /* Cannot use memcpy, because of pointers in GLmatrix _WindowMap */
1148       dst->Viewport.X = src->Viewport.X;
1149       dst->Viewport.Y = src->Viewport.Y;
1150       dst->Viewport.Width = src->Viewport.Width;
1151       dst->Viewport.Height = src->Viewport.Height;
1152       dst->Viewport.Near = src->Viewport.Near;
1153       dst->Viewport.Far = src->Viewport.Far;
1154       _math_matrix_copy(&dst->Viewport._WindowMap, &src->Viewport._WindowMap);
1155    }
1156
1157    /* XXX FIXME:  Call callbacks?
1158     */
1159    dst->NewState = _NEW_ALL;
1160 }
1161 #endif
1162
1163
1164 /**
1165  * Check if the given context can render into the given framebuffer
1166  * by checking visual attributes.
1167  *
1168  * Most of these tests could go away because Mesa is now pretty flexible
1169  * in terms of mixing rendering contexts with framebuffers.  As long
1170  * as RGB vs. CI mode agree, we're probably good.
1171  *
1172  * \return GL_TRUE if compatible, GL_FALSE otherwise.
1173  */
1174 static GLboolean
1175 check_compatible(const GLcontext *ctx, const GLframebuffer *buffer)
1176 {
1177    const GLvisual *ctxvis = &ctx->Visual;
1178    const GLvisual *bufvis = &buffer->Visual;
1179
1180    if (ctxvis == bufvis)
1181       return GL_TRUE;
1182
1183    if (ctxvis->rgbMode != bufvis->rgbMode)
1184       return GL_FALSE;
1185 #if 0
1186    /* disabling this fixes the fgl_glxgears pbuffer demo */
1187    if (ctxvis->doubleBufferMode && !bufvis->doubleBufferMode)
1188       return GL_FALSE;
1189 #endif
1190    if (ctxvis->stereoMode && !bufvis->stereoMode)
1191       return GL_FALSE;
1192    if (ctxvis->haveAccumBuffer && !bufvis->haveAccumBuffer)
1193       return GL_FALSE;
1194    if (ctxvis->haveDepthBuffer && !bufvis->haveDepthBuffer)
1195       return GL_FALSE;
1196    if (ctxvis->haveStencilBuffer && !bufvis->haveStencilBuffer)
1197       return GL_FALSE;
1198    if (ctxvis->redMask && ctxvis->redMask != bufvis->redMask)
1199       return GL_FALSE;
1200    if (ctxvis->greenMask && ctxvis->greenMask != bufvis->greenMask)
1201       return GL_FALSE;
1202    if (ctxvis->blueMask && ctxvis->blueMask != bufvis->blueMask)
1203       return GL_FALSE;
1204 #if 0
1205    /* disabled (see bug 11161) */
1206    if (ctxvis->depthBits && ctxvis->depthBits != bufvis->depthBits)
1207       return GL_FALSE;
1208 #endif
1209    if (ctxvis->stencilBits && ctxvis->stencilBits != bufvis->stencilBits)
1210       return GL_FALSE;
1211
1212    return GL_TRUE;
1213 }
1214
1215
1216 /**
1217  * Do one-time initialization for the given framebuffer.  Specifically,
1218  * ask the driver for the window's current size and update the framebuffer
1219  * object to match.
1220  * Really, the device driver should totally take care of this.
1221  */
1222 static void
1223 initialize_framebuffer_size(GLcontext *ctx, GLframebuffer *fb)
1224 {
1225    GLuint width, height;
1226    if (ctx->Driver.GetBufferSize) {
1227       ctx->Driver.GetBufferSize(fb, &width, &height);
1228       if (ctx->Driver.ResizeBuffers)
1229          ctx->Driver.ResizeBuffers(ctx, fb, width, height);
1230       fb->Initialized = GL_TRUE;
1231    }
1232 }
1233
1234
1235 /**
1236  * Check if the viewport/scissor size has not yet been initialized.
1237  * Initialize the size if the given width and height are non-zero.
1238  */
1239 void
1240 _mesa_check_init_viewport(GLcontext *ctx, GLuint width, GLuint height)
1241 {
1242    if (!ctx->ViewportInitialized && width > 0 && height > 0) {
1243       /* Note: set flag here, before calling _mesa_set_viewport(), to prevent
1244        * potential infinite recursion.
1245        */
1246       ctx->ViewportInitialized = GL_TRUE;
1247       _mesa_set_viewport(ctx, 0, 0, width, height);
1248       _mesa_set_scissor(ctx, 0, 0, width, height);
1249    }
1250 }
1251
1252
1253 /**
1254  * Bind the given context to the given drawBuffer and readBuffer and
1255  * make it the current context for the calling thread.
1256  * We'll render into the drawBuffer and read pixels from the
1257  * readBuffer (i.e. glRead/CopyPixels, glCopyTexImage, etc).
1258  *
1259  * We check that the context's and framebuffer's visuals are compatible
1260  * and return immediately if they're not.
1261  *
1262  * \param newCtx  the new GL context. If NULL then there will be no current GL
1263  *                context.
1264  * \param drawBuffer  the drawing framebuffer
1265  * \param readBuffer  the reading framebuffer
1266  */
1267 GLboolean
1268 _mesa_make_current( GLcontext *newCtx, GLframebuffer *drawBuffer,
1269                     GLframebuffer *readBuffer )
1270 {
1271    if (MESA_VERBOSE & VERBOSE_API)
1272       _mesa_debug(newCtx, "_mesa_make_current()\n");
1273
1274    /* Check that the context's and framebuffer's visuals are compatible.
1275     */
1276    if (newCtx && drawBuffer && newCtx->WinSysDrawBuffer != drawBuffer) {
1277       if (!check_compatible(newCtx, drawBuffer)) {
1278          _mesa_warning(newCtx,
1279               "MakeCurrent: incompatible visuals for context and drawbuffer");
1280          return GL_FALSE;
1281       }
1282    }
1283    if (newCtx && readBuffer && newCtx->WinSysReadBuffer != readBuffer) {
1284       if (!check_compatible(newCtx, readBuffer)) {
1285          _mesa_warning(newCtx,
1286               "MakeCurrent: incompatible visuals for context and readbuffer");
1287          return GL_FALSE;
1288       }
1289    }
1290
1291    /* We used to call _glapi_check_multithread() here.  Now do it in drivers */
1292    _glapi_set_context((void *) newCtx);
1293    ASSERT(_mesa_get_current_context() == newCtx);
1294
1295    if (!newCtx) {
1296       _glapi_set_dispatch(NULL);  /* none current */
1297    }
1298    else {
1299       _glapi_set_dispatch(newCtx->CurrentDispatch);
1300
1301       if (drawBuffer && readBuffer) {
1302          /* TODO: check if newCtx and buffer's visual match??? */
1303
1304          ASSERT(drawBuffer->Name == 0);
1305          ASSERT(readBuffer->Name == 0);
1306          _mesa_reference_framebuffer(&newCtx->WinSysDrawBuffer, drawBuffer);
1307          _mesa_reference_framebuffer(&newCtx->WinSysReadBuffer, readBuffer);
1308
1309          /*
1310           * Only set the context's Draw/ReadBuffer fields if they're NULL
1311           * or not bound to a user-created FBO.
1312           */
1313          if (!newCtx->DrawBuffer || newCtx->DrawBuffer->Name == 0) {
1314             /* KW: merge conflict here, revisit.
1315              */
1316             /* fix up the fb fields - these will end up wrong otherwise
1317              * if the DRIdrawable changes, and everything relies on them.
1318              * This is a bit messy (same as needed in _mesa_BindFramebufferEXT)
1319              */
1320             unsigned int i;
1321             GLenum buffers[MAX_DRAW_BUFFERS];
1322
1323             _mesa_reference_framebuffer(&newCtx->DrawBuffer, drawBuffer);
1324
1325             for(i = 0; i < newCtx->Const.MaxDrawBuffers; i++) {
1326                buffers[i] = newCtx->Color.DrawBuffer[i];
1327             }
1328
1329             _mesa_drawbuffers(newCtx, newCtx->Const.MaxDrawBuffers, buffers, NULL);
1330          }
1331          if (!newCtx->ReadBuffer || newCtx->ReadBuffer->Name == 0) {
1332             _mesa_reference_framebuffer(&newCtx->ReadBuffer, readBuffer);
1333          }
1334
1335          /* XXX only set this flag if we're really changing the draw/read
1336           * framebuffer bindings.
1337           */
1338          newCtx->NewState |= _NEW_BUFFERS;
1339
1340 #if 1
1341          /* We want to get rid of these lines: */
1342
1343 #if _HAVE_FULL_GL
1344          if (!drawBuffer->Initialized) {
1345             initialize_framebuffer_size(newCtx, drawBuffer);
1346          }
1347          if (readBuffer != drawBuffer && !readBuffer->Initialized) {
1348             initialize_framebuffer_size(newCtx, readBuffer);
1349          }
1350
1351          _mesa_resizebuffers(newCtx);
1352 #endif
1353
1354 #else
1355          /* We want the drawBuffer and readBuffer to be initialized by
1356           * the driver.
1357           * This generally means the Width and Height match the actual
1358           * window size and the renderbuffers (both hardware and software
1359           * based) are allocated to match.  The later can generally be
1360           * done with a call to _mesa_resize_framebuffer().
1361           *
1362           * It's theoretically possible for a buffer to have zero width
1363           * or height, but for now, assert check that the driver did what's
1364           * expected of it.
1365           */
1366          ASSERT(drawBuffer->Width > 0);
1367          ASSERT(drawBuffer->Height > 0);
1368 #endif
1369
1370          if (drawBuffer) {
1371             _mesa_check_init_viewport(newCtx,
1372                                       drawBuffer->Width, drawBuffer->Height);
1373          }
1374       }
1375
1376       if (newCtx->FirstTimeCurrent) {
1377          check_context_limits(newCtx);
1378
1379          /* We can use this to help debug user's problems.  Tell them to set
1380           * the MESA_INFO env variable before running their app.  Then the
1381           * first time each context is made current we'll print some useful
1382           * information.
1383           */
1384          if (_mesa_getenv("MESA_INFO")) {
1385             _mesa_print_info();
1386          }
1387
1388          newCtx->FirstTimeCurrent = GL_FALSE;
1389       }
1390    }
1391
1392    return GL_TRUE;
1393 }
1394
1395
1396 /**
1397  * Make context 'ctx' share the display lists, textures and programs
1398  * that are associated with 'ctxToShare'.
1399  * Any display lists, textures or programs associated with 'ctx' will
1400  * be deleted if nobody else is sharing them.
1401  */
1402 GLboolean
1403 _mesa_share_state(GLcontext *ctx, GLcontext *ctxToShare)
1404 {
1405    if (ctx && ctxToShare && ctx->Shared && ctxToShare->Shared) {
1406       struct gl_shared_state *oldSharedState = ctx->Shared;
1407       GLint RefCount;
1408
1409       ctx->Shared = ctxToShare->Shared;
1410
1411       _glthread_LOCK_MUTEX(ctx->Shared->Mutex);
1412       ctx->Shared->RefCount++;
1413       _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
1414
1415       update_default_objects(ctx);
1416
1417       _glthread_LOCK_MUTEX(oldSharedState->Mutex);
1418       RefCount = --oldSharedState->RefCount;
1419       _glthread_UNLOCK_MUTEX(oldSharedState->Mutex);
1420
1421       if (RefCount == 0) {
1422          _mesa_free_shared_state(ctx, oldSharedState);
1423       }
1424
1425       return GL_TRUE;
1426    }
1427    else {
1428       return GL_FALSE;
1429    }
1430 }
1431
1432
1433
1434 /**
1435  * \return pointer to the current GL context for this thread.
1436  *
1437  * Calls _glapi_get_context(). This isn't the fastest way to get the current
1438  * context.  If you need speed, see the #GET_CURRENT_CONTEXT macro in
1439  * context.h.
1440  */
1441 GLcontext *
1442 _mesa_get_current_context( void )
1443 {
1444    return (GLcontext *) _glapi_get_context();
1445 }
1446
1447
1448 /**
1449  * Get context's current API dispatch table.
1450  *
1451  * It'll either be the immediate-mode execute dispatcher or the display list
1452  * compile dispatcher.
1453  *
1454  * \param ctx GL context.
1455  *
1456  * \return pointer to dispatch_table.
1457  *
1458  * Simply returns __GLcontextRec::CurrentDispatch.
1459  */
1460 struct _glapi_table *
1461 _mesa_get_dispatch(GLcontext *ctx)
1462 {
1463    return ctx->CurrentDispatch;
1464 }
1465
1466 /*@}*/
1467
1468
1469 /**********************************************************************/
1470 /** \name Miscellaneous functions                                     */
1471 /**********************************************************************/
1472 /*@{*/
1473
1474 /**
1475  * Record an error.
1476  *
1477  * \param ctx GL context.
1478  * \param error error code.
1479  *
1480  * Records the given error code and call the driver's dd_function_table::Error
1481  * function if defined.
1482  *
1483  * \sa
1484  * This is called via _mesa_error().
1485  */
1486 void
1487 _mesa_record_error(GLcontext *ctx, GLenum error)
1488 {
1489    if (!ctx)
1490       return;
1491
1492    if (ctx->ErrorValue == GL_NO_ERROR) {
1493       ctx->ErrorValue = error;
1494    }
1495
1496    /* Call device driver's error handler, if any.  This is used on the Mac. */
1497    if (ctx->Driver.Error) {
1498       ctx->Driver.Error(ctx);
1499    }
1500 }
1501
1502
1503 /**
1504  * Flush commands and wait for completion.
1505  */
1506 void
1507 _mesa_finish(GLcontext *ctx)
1508 {
1509    FLUSH_CURRENT( ctx, 0 );
1510    if (ctx->Driver.Finish) {
1511       ctx->Driver.Finish(ctx);
1512    }
1513 }
1514
1515
1516 /**
1517  * Flush commands.
1518  */
1519 void
1520 _mesa_flush(GLcontext *ctx)
1521 {
1522    FLUSH_CURRENT( ctx, 0 );
1523    if (ctx->Driver.Flush) {
1524       ctx->Driver.Flush(ctx);
1525    }
1526 }
1527
1528
1529
1530 /**
1531  * Execute glFinish().
1532  *
1533  * Calls the #ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH macro and the
1534  * dd_function_table::Finish driver callback, if not NULL.
1535  */
1536 void GLAPIENTRY
1537 _mesa_Finish(void)
1538 {
1539    GET_CURRENT_CONTEXT(ctx);
1540    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
1541    _mesa_finish(ctx);
1542 }
1543
1544
1545 /**
1546  * Execute glFlush().
1547  *
1548  * Calls the #ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH macro and the
1549  * dd_function_table::Flush driver callback, if not NULL.
1550  */
1551 void GLAPIENTRY
1552 _mesa_Flush(void)
1553 {
1554    GET_CURRENT_CONTEXT(ctx);
1555    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
1556    _mesa_flush(ctx);
1557 }
1558
1559
1560 /**
1561  * Set mvp_with_dp4 flag.  If a driver has a preference for DP4 over
1562  * MUL/MAD, or vice versa, call this function to register that.
1563  * Otherwise we default to MUL/MAD.
1564  */
1565 void
1566 _mesa_set_mvp_with_dp4( GLcontext *ctx,
1567                         GLboolean flag )
1568 {
1569    ctx->mvp_with_dp4 = flag;
1570 }
1571
1572
1573
1574 /**
1575  * Prior to drawing anything with glBegin, glDrawArrays, etc. this function
1576  * is called to see if it's valid to render.  This involves checking that
1577  * the current shader is valid and the framebuffer is complete.
1578  * If an error is detected it'll be recorded here.
1579  * \return GL_TRUE if OK to render, GL_FALSE if not
1580  */
1581 GLboolean
1582 _mesa_valid_to_render(GLcontext *ctx, const char *where)
1583 {
1584    if (ctx->Shader.CurrentProgram) {
1585       /* using shaders */
1586       if (!ctx->Shader.CurrentProgram->LinkStatus) {
1587          _mesa_error(ctx, GL_INVALID_OPERATION,
1588                      "%s(shader not linked), where");
1589          return GL_FALSE;
1590       }
1591 #if 0 /* not normally enabled */
1592       {
1593          char errMsg[100];
1594          if (!_mesa_validate_shader_program(ctx, ctx->Shader.CurrentProgram,
1595                                             errMsg)) {
1596             _mesa_warning(ctx, "Shader program %u is invalid: %s",
1597                           ctx->Shader.CurrentProgram->Name, errMsg);
1598          }
1599       }
1600 #endif
1601    }
1602    else {
1603       if (ctx->VertexProgram.Enabled && !ctx->VertexProgram._Enabled) {
1604          _mesa_error(ctx, GL_INVALID_OPERATION,
1605                      "%s(vertex program not valid)", where);
1606          return GL_FALSE;
1607       }
1608       if (ctx->FragmentProgram.Enabled && !ctx->FragmentProgram._Enabled) {
1609          _mesa_error(ctx, GL_INVALID_OPERATION,
1610                      "%s(fragment program not valid)", where);
1611          return GL_FALSE;
1612       }
1613    }
1614
1615    if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
1616       _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
1617                   "%s(incomplete framebuffer)", where);
1618       return GL_FALSE;
1619    }
1620
1621 #ifdef DEBUG
1622    if (ctx->Shader.Flags & GLSL_LOG) {
1623       struct gl_shader_program *shProg = ctx->Shader.CurrentProgram;
1624       if (shProg) {
1625          if (!shProg->_Used) {
1626             /* This is the first time this shader is being used.
1627              * Append shader's constants/uniforms to log file.
1628              */
1629             GLuint i;
1630             for (i = 0; i < shProg->NumShaders; i++) {
1631                struct gl_shader *sh = shProg->Shaders[i];
1632                if (sh->Type == GL_VERTEX_SHADER) {
1633                   _mesa_append_uniforms_to_file(sh,
1634                                                 &shProg->VertexProgram->Base);
1635                }
1636                else if (sh->Type == GL_FRAGMENT_SHADER) {
1637                   _mesa_append_uniforms_to_file(sh,
1638                                                 &shProg->FragmentProgram->Base);
1639                }
1640             }
1641             shProg->_Used = GL_TRUE;
1642          }
1643       }
1644    }
1645 #endif
1646
1647    return GL_TRUE;
1648 }
1649
1650
1651 /*@}*/