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