src/mesa/main/context.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
   5  * Copyright (C) 2008  VMware, Inc.  All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  21  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  22  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  23  * 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 "imports.h"
  81 #include "accum.h"
  82 #include "api_exec.h"
  83 #include "api_loopback.h"
  84 #include "arrayobj.h"
  85 #include "attrib.h"
  86 #include "bbox.h"
  87 #include "blend.h"
  88 #include "buffers.h"
  89 #include "bufferobj.h"
  90 #include "conservativeraster.h"
  91 #include "context.h"
  92 #include "cpuinfo.h"
  93 #include "debug.h"
  94 #include "debug_output.h"
  95 #include "depth.h"
  96 #include "dlist.h"
  97 #include "eval.h"
  98 #include "extensions.h"
  99 #include "fbobject.h"
 100 #include "feedback.h"
 101 #include "fog.h"
 102 #include "formats.h"
 103 #include "framebuffer.h"
 104 #include "glthread.h"
 105 #include "hint.h"
 106 #include "hash.h"
 107 #include "light.h"
 108 #include "lines.h"
 109 #include "macros.h"
 110 #include "matrix.h"
 111 #include "multisample.h"
 112 #include "performance_monitor.h"
 113 #include "performance_query.h"
 114 #include "pipelineobj.h"
 115 #include "pixel.h"
 116 #include "pixelstore.h"
 117 #include "points.h"
 118 #include "polygon.h"
 119 #include "queryobj.h"
 120 #include "syncobj.h"
 121 #include "rastpos.h"
 122 #include "remap.h"
 123 #include "scissor.h"
 124 #include "shared.h"
 125 #include "shaderobj.h"
 126 #include "shaderimage.h"
 127 #include "state.h"
 128 #include "util/debug.h"
 129 #include "util/disk_cache.h"
 130 #include "util/strtod.h"
 131 #include "stencil.h"
 132 #include "texcompress_s3tc.h"
 133 #include "texstate.h"
 134 #include "transformfeedback.h"
 135 #include "mtypes.h"
 136 #include "varray.h"
 137 #include "version.h"
 138 #include "viewport.h"
 139 #include "texturebindless.h"
 140 #include "program/program.h"
 141 #include "math/m_matrix.h"
 142 #include "main/dispatch.h" /* for _gloffset_COUNT */
 143 #include "macros.h"
 144 #include "git_sha1.h"
 145
 146 #ifdef USE_SPARC_ASM
 147 #include "sparc/sparc.h"
 148 #endif
 149
 150 #include "compiler/glsl_types.h"
 151 #include "compiler/glsl/glsl_parser_extras.h"
 152 #include <stdbool.h>
 153
 154
 155 #ifndef MESA_VERBOSE
 156 int MESA_VERBOSE = 0;
 157 #endif
 158
 159 #ifndef MESA_DEBUG_FLAGS
 160 int MESA_DEBUG_FLAGS = 0;
 161 #endif
 162
 163
 164 /* ubyte -> float conversion */
 165 GLfloat _mesa_ubyte_to_float_color_tab[256];
 166
 167
 168
 169 /**
 170  * Swap buffers notification callback.
 171  *
 172  * \param ctx GL context.
 173  *
 174  * Called by window system just before swapping buffers.
 175  * We have to finish any pending rendering.
 176  */
 177 void
 178 _mesa_notifySwapBuffers(struct gl_context *ctx)
 179 {
 180    if (MESA_VERBOSE & VERBOSE_SWAPBUFFERS)
 181       _mesa_debug(ctx, "SwapBuffers\n");
 182    FLUSH_CURRENT( ctx, 0 );
 183    if (ctx->Driver.Flush) {
 184       ctx->Driver.Flush(ctx);
 185    }
 186 }
 187
 188
 189 /**********************************************************************/
 190 /** \name GL Visual allocation/destruction                            */
 191 /**********************************************************************/
 192 /*@{*/
 193
 194 /**
 195  * Allocates a struct gl_config structure and initializes it via
 196  * _mesa_initialize_visual().
 197  *
 198  * \param dbFlag double buffering
 199  * \param stereoFlag stereo buffer
 200  * \param depthBits requested bits per depth buffer value. Any value in [0, 32]
 201  * is acceptable but the actual depth type will be GLushort or GLuint as
 202  * needed.
 203  * \param stencilBits requested minimum bits per stencil buffer value
 204  * \param accumRedBits, accumGreenBits, accumBlueBits, accumAlphaBits number
 205  * of bits per color component in accum buffer.
 206  * \param indexBits number of bits per pixel if \p rgbFlag is GL_FALSE
 207  * \param redBits number of bits per color component in frame buffer for RGB(A)
 208  * mode.  We always use 8 in core Mesa though.
 209  * \param greenBits same as above.
 210  * \param blueBits same as above.
 211  * \param alphaBits same as above.
 212  * \param numSamples not really used.
 213  *
 214  * \return pointer to new struct gl_config or NULL if requested parameters
 215  * can't be met.
 216  *
 217  * \note Need to add params for level and numAuxBuffers (at least)
 218  */
 219 struct gl_config *
 220 _mesa_create_visual( GLboolean dbFlag,
 221                      GLboolean stereoFlag,
 222                      GLint redBits,
 223                      GLint greenBits,
 224                      GLint blueBits,
 225                      GLint alphaBits,
 226                      GLint depthBits,
 227                      GLint stencilBits,
 228                      GLint accumRedBits,
 229                      GLint accumGreenBits,
 230                      GLint accumBlueBits,
 231                      GLint accumAlphaBits,
 232                      GLuint numSamples )
 233 {
 234    struct gl_config *vis = CALLOC_STRUCT(gl_config);
 235    if (vis) {
 236       if (!_mesa_initialize_visual(vis, dbFlag, stereoFlag,
 237                                    redBits, greenBits, blueBits, alphaBits,
 238                                    depthBits, stencilBits,
 239                                    accumRedBits, accumGreenBits,
 240                                    accumBlueBits, accumAlphaBits,
 241                                    numSamples)) {
 242          free(vis);
 243          return NULL;
 244       }
 245    }
 246    return vis;
 247 }
 248
 249
 250 /**
 251  * Makes some sanity checks and fills in the fields of the struct
 252  * gl_config object with the given parameters.  If the caller needs to
 253  * set additional fields, he should just probably init the whole
 254  * gl_config object himself.
 255  *
 256  * \return GL_TRUE on success, or GL_FALSE on failure.
 257  *
 258  * \sa _mesa_create_visual() above for the parameter description.
 259  */
 260 GLboolean
 261 _mesa_initialize_visual( struct gl_config *vis,
 262                          GLboolean dbFlag,
 263                          GLboolean stereoFlag,
 264                          GLint redBits,
 265                          GLint greenBits,
 266                          GLint blueBits,
 267                          GLint alphaBits,
 268                          GLint depthBits,
 269                          GLint stencilBits,
 270                          GLint accumRedBits,
 271                          GLint accumGreenBits,
 272                          GLint accumBlueBits,
 273                          GLint accumAlphaBits,
 274                          GLuint numSamples )
 275 {
 276    assert(vis);
 277
 278    if (depthBits < 0 || depthBits > 32) {
 279       return GL_FALSE;
 280    }
 281    if (stencilBits < 0 || stencilBits > 8) {
 282       return GL_FALSE;
 283    }
 284    assert(accumRedBits >= 0);
 285    assert(accumGreenBits >= 0);
 286    assert(accumBlueBits >= 0);
 287    assert(accumAlphaBits >= 0);
 288
 289    vis->rgbMode          = GL_TRUE;
 290    vis->doubleBufferMode = dbFlag;
 291    vis->stereoMode       = stereoFlag;
 292
 293    vis->redBits          = redBits;
 294    vis->greenBits        = greenBits;
 295    vis->blueBits         = blueBits;
 296    vis->alphaBits        = alphaBits;
 297    vis->rgbBits          = redBits + greenBits + blueBits;
 298
 299    vis->indexBits      = 0;
 300    vis->depthBits      = depthBits;
 301    vis->stencilBits    = stencilBits;
 302
 303    vis->accumRedBits   = accumRedBits;
 304    vis->accumGreenBits = accumGreenBits;
 305    vis->accumBlueBits  = accumBlueBits;
 306    vis->accumAlphaBits = accumAlphaBits;
 307
 308    vis->haveAccumBuffer   = accumRedBits > 0;
 309    vis->haveDepthBuffer   = depthBits > 0;
 310    vis->haveStencilBuffer = stencilBits > 0;
 311
 312    vis->numAuxBuffers = 0;
 313    vis->level = 0;
 314    vis->sampleBuffers = numSamples > 0 ? 1 : 0;
 315    vis->samples = numSamples;
 316
 317    return GL_TRUE;
 318 }
 319
 320
 321 /**
 322  * Destroy a visual and free its memory.
 323  *
 324  * \param vis visual.
 325  *
 326  * Frees the visual structure.
 327  */
 328 void
 329 _mesa_destroy_visual( struct gl_config *vis )
 330 {
 331    free(vis);
 332 }
 333
 334 /*@}*/
 335
 336
 337 /**********************************************************************/
 338 /** \name Context allocation, initialization, destroying
 339  *
 340  * The purpose of the most initialization functions here is to provide the
 341  * default state values according to the OpenGL specification.
 342  */
 343 /**********************************************************************/
 344 /*@{*/
 345
 346
 347 /**
 348  * One-time initialization mutex lock.
 349  *
 350  * \sa Used by one_time_init().
 351  */
 352 mtx_t OneTimeLock = _MTX_INITIALIZER_NP;
 353
 354
 355 /**
 356  * Calls all the various one-time-fini functions in Mesa
 357  */
 358
 359 static void
 360 one_time_fini(void)
 361 {
 362    _mesa_destroy_shader_compiler();
 363    _mesa_locale_fini();
 364 }
 365
 366 /**
 367  * Calls all the various one-time-init functions in Mesa.
 368  *
 369  * While holding a global mutex lock, calls several initialization functions,
 370  * and sets the glapi callbacks if the \c MESA_DEBUG environment variable is
 371  * defined.
 372  *
 373  * \sa _math_init().
 374  */
 375 static void
 376 one_time_init( struct gl_context *ctx )
 377 {
 378    static GLbitfield api_init_mask = 0x0;
 379
 380    mtx_lock(&OneTimeLock);
 381
 382    /* truly one-time init */
 383    if (!api_init_mask) {
 384       GLuint i;
 385
 386       STATIC_ASSERT(sizeof(GLbyte) == 1);
 387       STATIC_ASSERT(sizeof(GLubyte) == 1);
 388       STATIC_ASSERT(sizeof(GLshort) == 2);
 389       STATIC_ASSERT(sizeof(GLushort) == 2);
 390       STATIC_ASSERT(sizeof(GLint) == 4);
 391       STATIC_ASSERT(sizeof(GLuint) == 4);
 392
 393       _mesa_locale_init();
 394
 395       _mesa_one_time_init_extension_overrides(ctx);
 396
 397       _mesa_get_cpu_features();
 398
 399       for (i = 0; i < 256; i++) {
 400          _mesa_ubyte_to_float_color_tab[i] = (float) i / 255.0F;
 401       }
 402
 403       atexit(one_time_fini);
 404
 405 #if defined(DEBUG)
 406       if (MESA_VERBOSE != 0) {
 407          _mesa_debug(ctx, "Mesa " PACKAGE_VERSION " DEBUG build"
 408 #ifdef MESA_GIT_SHA1
 409                      " (" MESA_GIT_SHA1 ")"
 410 #endif
 411                      "\n");
 412       }
 413 #endif
 414    }
 415
 416    /* per-API one-time init */
 417    if (!(api_init_mask & (1 << ctx->API))) {
 418       _mesa_init_remap_table();
 419    }
 420
 421    api_init_mask |= 1 << ctx->API;
 422
 423    mtx_unlock(&OneTimeLock);
 424 }
 425
 426
 427 /**
 428  * Initialize fields of gl_current_attrib (aka ctx->Current.*)
 429  */
 430 static void
 431 _mesa_init_current(struct gl_context *ctx)
 432 {
 433    GLuint i;
 434
 435    /* Init all to (0,0,0,1) */
 436    for (i = 0; i < ARRAY_SIZE(ctx->Current.Attrib); i++) {
 437       ASSIGN_4V( ctx->Current.Attrib[i], 0.0, 0.0, 0.0, 1.0 );
 438    }
 439
 440    /* redo special cases: */
 441    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_NORMAL], 0.0, 0.0, 1.0, 1.0 );
 442    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_COLOR0], 1.0, 1.0, 1.0, 1.0 );
 443    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_COLOR1], 0.0, 0.0, 0.0, 1.0 );
 444    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_COLOR_INDEX], 1.0, 0.0, 0.0, 1.0 );
 445    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_EDGEFLAG], 1.0, 0.0, 0.0, 1.0 );
 446 }
 447
 448
 449 /**
 450  * Init vertex/fragment/geometry program limits.
 451  * Important: drivers should override these with actual limits.
 452  */
 453 static void
 454 init_program_limits(struct gl_constants *consts, gl_shader_stage stage,
 455                     struct gl_program_constants *prog)
 456 {
 457    prog->MaxInstructions = MAX_PROGRAM_INSTRUCTIONS;
 458    prog->MaxAluInstructions = MAX_PROGRAM_INSTRUCTIONS;
 459    prog->MaxTexInstructions = MAX_PROGRAM_INSTRUCTIONS;
 460    prog->MaxTexIndirections = MAX_PROGRAM_INSTRUCTIONS;
 461    prog->MaxTemps = MAX_PROGRAM_TEMPS;
 462    prog->MaxEnvParams = MAX_PROGRAM_ENV_PARAMS;
 463    prog->MaxLocalParams = MAX_PROGRAM_LOCAL_PARAMS;
 464    prog->MaxAddressOffset = MAX_PROGRAM_LOCAL_PARAMS;
 465
 466    switch (stage) {
 467    case MESA_SHADER_VERTEX:
 468       prog->MaxParameters = MAX_VERTEX_PROGRAM_PARAMS;
 469       prog->MaxAttribs = MAX_VERTEX_GENERIC_ATTRIBS;
 470       prog->MaxAddressRegs = MAX_VERTEX_PROGRAM_ADDRESS_REGS;
 471       prog->MaxUniformComponents = 4 * MAX_UNIFORMS;
 472       prog->MaxInputComponents = 0; /* value not used */
 473       prog->MaxOutputComponents = 16 * 4; /* old limit not to break tnl and swrast */
 474       break;
 475    case MESA_SHADER_FRAGMENT:
 476       prog->MaxParameters = MAX_FRAGMENT_PROGRAM_PARAMS;
 477       prog->MaxAttribs = MAX_FRAGMENT_PROGRAM_INPUTS;
 478       prog->MaxAddressRegs = MAX_FRAGMENT_PROGRAM_ADDRESS_REGS;
 479       prog->MaxUniformComponents = 4 * MAX_UNIFORMS;
 480       prog->MaxInputComponents = 16 * 4; /* old limit not to break tnl and swrast */
 481       prog->MaxOutputComponents = 0; /* value not used */
 482       break;
 483    case MESA_SHADER_TESS_CTRL:
 484    case MESA_SHADER_TESS_EVAL:
 485    case MESA_SHADER_GEOMETRY:
 486       prog->MaxParameters = MAX_VERTEX_PROGRAM_PARAMS;
 487       prog->MaxAttribs = MAX_VERTEX_GENERIC_ATTRIBS;
 488       prog->MaxAddressRegs = MAX_VERTEX_PROGRAM_ADDRESS_REGS;
 489       prog->MaxUniformComponents = 4 * MAX_UNIFORMS;
 490       prog->MaxInputComponents = 16 * 4; /* old limit not to break tnl and swrast */
 491       prog->MaxOutputComponents = 16 * 4; /* old limit not to break tnl and swrast */
 492       break;
 493    case MESA_SHADER_COMPUTE:
 494       prog->MaxParameters = 0; /* not meaningful for compute shaders */
 495       prog->MaxAttribs = 0; /* not meaningful for compute shaders */
 496       prog->MaxAddressRegs = 0; /* not meaningful for compute shaders */
 497       prog->MaxUniformComponents = 4 * MAX_UNIFORMS;
 498       prog->MaxInputComponents = 0; /* not meaningful for compute shaders */
 499       prog->MaxOutputComponents = 0; /* not meaningful for compute shaders */
 500       break;
 501    default:
 502       assert(0 && "Bad shader stage in init_program_limits()");
 503    }
 504
 505    /* Set the native limits to zero.  This implies that there is no native
 506     * support for shaders.  Let the drivers fill in the actual values.
 507     */
 508    prog->MaxNativeInstructions = 0;
 509    prog->MaxNativeAluInstructions = 0;
 510    prog->MaxNativeTexInstructions = 0;
 511    prog->MaxNativeTexIndirections = 0;
 512    prog->MaxNativeAttribs = 0;
 513    prog->MaxNativeTemps = 0;
 514    prog->MaxNativeAddressRegs = 0;
 515    prog->MaxNativeParameters = 0;
 516
 517    /* Set GLSL datatype range/precision info assuming IEEE float values.
 518     * Drivers should override these defaults as needed.
 519     */
 520    prog->MediumFloat.RangeMin = 127;
 521    prog->MediumFloat.RangeMax = 127;
 522    prog->MediumFloat.Precision = 23;
 523    prog->LowFloat = prog->HighFloat = prog->MediumFloat;
 524
 525    /* Assume ints are stored as floats for now, since this is the least-common
 526     * denominator.  The OpenGL ES spec implies (page 132) that the precision
 527     * of integer types should be 0.  Practically speaking, IEEE
 528     * single-precision floating point values can only store integers in the
 529     * range [-0x01000000, 0x01000000] without loss of precision.
 530     */
 531    prog->MediumInt.RangeMin = 24;
 532    prog->MediumInt.RangeMax = 24;
 533    prog->MediumInt.Precision = 0;
 534    prog->LowInt = prog->HighInt = prog->MediumInt;
 535
 536    prog->MaxUniformBlocks = 12;
 537    prog->MaxCombinedUniformComponents = (prog->MaxUniformComponents +
 538                                          consts->MaxUniformBlockSize / 4 *
 539                                          prog->MaxUniformBlocks);
 540
 541    prog->MaxAtomicBuffers = 0;
 542    prog->MaxAtomicCounters = 0;
 543
 544    prog->MaxShaderStorageBlocks = 8;
 545 }
 546
 547
 548 /**
 549  * Initialize fields of gl_constants (aka ctx->Const.*).
 550  * Use defaults from config.h.  The device drivers will often override
 551  * some of these values (such as number of texture units).
 552  */
 553 void
 554 _mesa_init_constants(struct gl_constants *consts, gl_api api)
 555 {
 556    int i;
 557    assert(consts);
 558
 559    /* Constants, may be overriden (usually only reduced) by device drivers */
 560    consts->MaxTextureMbytes = MAX_TEXTURE_MBYTES;
 561    consts->MaxTextureLevels = MAX_TEXTURE_LEVELS;
 562    consts->Max3DTextureLevels = MAX_3D_TEXTURE_LEVELS;
 563    consts->MaxCubeTextureLevels = MAX_CUBE_TEXTURE_LEVELS;
 564    consts->MaxTextureRectSize = MAX_TEXTURE_RECT_SIZE;
 565    consts->MaxArrayTextureLayers = MAX_ARRAY_TEXTURE_LAYERS;
 566    consts->MaxTextureCoordUnits = MAX_TEXTURE_COORD_UNITS;
 567    consts->Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits = MAX_TEXTURE_IMAGE_UNITS;
 568    consts->MaxTextureUnits = MIN2(consts->MaxTextureCoordUnits,
 569                                      consts->Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits);
 570    consts->MaxTextureMaxAnisotropy = MAX_TEXTURE_MAX_ANISOTROPY;
 571    consts->MaxTextureLodBias = MAX_TEXTURE_LOD_BIAS;
 572    consts->MaxTextureBufferSize = 65536;
 573    consts->TextureBufferOffsetAlignment = 1;
 574    consts->MaxArrayLockSize = MAX_ARRAY_LOCK_SIZE;
 575    consts->SubPixelBits = SUB_PIXEL_BITS;
 576    consts->MinPointSize = MIN_POINT_SIZE;
 577    consts->MaxPointSize = MAX_POINT_SIZE;
 578    consts->MinPointSizeAA = MIN_POINT_SIZE;
 579    consts->MaxPointSizeAA = MAX_POINT_SIZE;
 580    consts->PointSizeGranularity = (GLfloat) POINT_SIZE_GRANULARITY;
 581    consts->MinLineWidth = MIN_LINE_WIDTH;
 582    consts->MaxLineWidth = MAX_LINE_WIDTH;
 583    consts->MinLineWidthAA = MIN_LINE_WIDTH;
 584    consts->MaxLineWidthAA = MAX_LINE_WIDTH;
 585    consts->LineWidthGranularity = (GLfloat) LINE_WIDTH_GRANULARITY;
 586    consts->MaxClipPlanes = 6;
 587    consts->MaxLights = MAX_LIGHTS;
 588    consts->MaxShininess = 128.0;
 589    consts->MaxSpotExponent = 128.0;
 590    consts->MaxViewportWidth = 16384;
 591    consts->MaxViewportHeight = 16384;
 592    consts->MinMapBufferAlignment = 64;
 593
 594    /* Driver must override these values if ARB_viewport_array is supported. */
 595    consts->MaxViewports = 1;
 596    consts->ViewportSubpixelBits = 0;
 597    consts->ViewportBounds.Min = 0;
 598    consts->ViewportBounds.Max = 0;
 599
 600    /** GL_ARB_uniform_buffer_object */
 601    consts->MaxCombinedUniformBlocks = 36;
 602    consts->MaxUniformBufferBindings = 36;
 603    consts->MaxUniformBlockSize = 16384;
 604    consts->UniformBufferOffsetAlignment = 1;
 605
 606    /** GL_ARB_shader_storage_buffer_object */
 607    consts->MaxCombinedShaderStorageBlocks = 8;
 608    consts->MaxShaderStorageBufferBindings = 8;
 609    consts->MaxShaderStorageBlockSize = 128 * 1024 * 1024; /* 2^27 */
 610    consts->ShaderStorageBufferOffsetAlignment = 256;
 611
 612    /* GL_ARB_explicit_uniform_location, GL_MAX_UNIFORM_LOCATIONS */
 613    consts->MaxUserAssignableUniformLocations =
 614       4 * MESA_SHADER_STAGES * MAX_UNIFORMS;
 615
 616    for (i = 0; i < MESA_SHADER_STAGES; i++)
 617       init_program_limits(consts, i, &consts->Program[i]);
 618
 619    consts->MaxProgramMatrices = MAX_PROGRAM_MATRICES;
 620    consts->MaxProgramMatrixStackDepth = MAX_PROGRAM_MATRIX_STACK_DEPTH;
 621
 622    /* Assume that if GLSL 1.30+ (or GLSL ES 3.00+) is supported that
 623     * gl_VertexID is implemented using a native hardware register with OpenGL
 624     * semantics.
 625     */
 626    consts->VertexID_is_zero_based = false;
 627
 628    /* GL_ARB_draw_buffers */
 629    consts->MaxDrawBuffers = MAX_DRAW_BUFFERS;
 630
 631    consts->MaxColorAttachments = MAX_COLOR_ATTACHMENTS;
 632    consts->MaxRenderbufferSize = MAX_RENDERBUFFER_SIZE;
 633
 634    consts->Program[MESA_SHADER_VERTEX].MaxTextureImageUnits = MAX_TEXTURE_IMAGE_UNITS;
 635    consts->MaxCombinedTextureImageUnits = MAX_COMBINED_TEXTURE_IMAGE_UNITS;
 636    consts->MaxVarying = 16; /* old limit not to break tnl and swrast */
 637    consts->Program[MESA_SHADER_GEOMETRY].MaxTextureImageUnits = MAX_TEXTURE_IMAGE_UNITS;
 638    consts->MaxGeometryOutputVertices = MAX_GEOMETRY_OUTPUT_VERTICES;
 639    consts->MaxGeometryTotalOutputComponents = MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS;
 640
 641 #ifdef DEBUG
 642    consts->GenerateTemporaryNames = true;
 643 #else
 644    consts->GenerateTemporaryNames = false;
 645 #endif
 646
 647    /* GL_ARB_framebuffer_object */
 648    consts->MaxSamples = 0;
 649
 650    /* GLSL default if NativeIntegers == FALSE */
 651    consts->UniformBooleanTrue = FLOAT_AS_UNION(1.0f).u;
 652
 653    /* GL_ARB_sync */
 654    consts->MaxServerWaitTimeout = 0x7fffffff7fffffffULL;
 655
 656    /* GL_EXT_provoking_vertex */
 657    consts->QuadsFollowProvokingVertexConvention = GL_TRUE;
 658
 659    /** GL_ARB_viewport_array */
 660    consts->LayerAndVPIndexProvokingVertex = GL_UNDEFINED_VERTEX;
 661
 662    /* GL_EXT_transform_feedback */
 663    consts->MaxTransformFeedbackBuffers = MAX_FEEDBACK_BUFFERS;
 664    consts->MaxTransformFeedbackSeparateComponents = 4 * MAX_FEEDBACK_ATTRIBS;
 665    consts->MaxTransformFeedbackInterleavedComponents = 4 * MAX_FEEDBACK_ATTRIBS;
 666    consts->MaxVertexStreams = 1;
 667
 668    /* GL 3.2  */
 669    consts->ProfileMask = api == API_OPENGL_CORE
 670                           ? GL_CONTEXT_CORE_PROFILE_BIT
 671                           : GL_CONTEXT_COMPATIBILITY_PROFILE_BIT;
 672
 673    /* GL 4.4 */
 674    consts->MaxVertexAttribStride = 2048;
 675
 676    /** GL_EXT_gpu_shader4 */
 677    consts->MinProgramTexelOffset = -8;
 678    consts->MaxProgramTexelOffset = 7;
 679
 680    /* GL_ARB_texture_gather */
 681    consts->MinProgramTextureGatherOffset = -8;
 682    consts->MaxProgramTextureGatherOffset = 7;
 683
 684    /* GL_ARB_robustness */
 685    consts->ResetStrategy = GL_NO_RESET_NOTIFICATION_ARB;
 686
 687    /* GL_KHR_robustness */
 688    consts->RobustAccess = GL_FALSE;
 689
 690    /* ES 3.0 or ARB_ES3_compatibility */
 691    consts->MaxElementIndex = 0xffffffffu;
 692
 693    /* GL_ARB_texture_multisample */
 694    consts->MaxColorTextureSamples = 1;
 695    consts->MaxDepthTextureSamples = 1;
 696    consts->MaxIntegerSamples = 1;
 697
 698    /* GL_ARB_shader_atomic_counters */
 699    consts->MaxAtomicBufferBindings = MAX_COMBINED_ATOMIC_BUFFERS;
 700    consts->MaxAtomicBufferSize = MAX_ATOMIC_COUNTERS * ATOMIC_COUNTER_SIZE;
 701    consts->MaxCombinedAtomicBuffers = MAX_COMBINED_ATOMIC_BUFFERS;
 702    consts->MaxCombinedAtomicCounters = MAX_ATOMIC_COUNTERS;
 703
 704    /* GL_ARB_vertex_attrib_binding */
 705    consts->MaxVertexAttribRelativeOffset = 2047;
 706    consts->MaxVertexAttribBindings = MAX_VERTEX_GENERIC_ATTRIBS;
 707
 708    /* GL_ARB_compute_shader */
 709    consts->MaxComputeWorkGroupCount[0] = 65535;
 710    consts->MaxComputeWorkGroupCount[1] = 65535;
 711    consts->MaxComputeWorkGroupCount[2] = 65535;
 712    consts->MaxComputeWorkGroupSize[0] = 1024;
 713    consts->MaxComputeWorkGroupSize[1] = 1024;
 714    consts->MaxComputeWorkGroupSize[2] = 64;
 715    /* Enables compute support for GLES 3.1 if >= 128 */
 716    consts->MaxComputeWorkGroupInvocations = 0;
 717
 718    /** GL_ARB_gpu_shader5 */
 719    consts->MinFragmentInterpolationOffset = MIN_FRAGMENT_INTERPOLATION_OFFSET;
 720    consts->MaxFragmentInterpolationOffset = MAX_FRAGMENT_INTERPOLATION_OFFSET;
 721
 722    /** GL_KHR_context_flush_control */
 723    consts->ContextReleaseBehavior = GL_CONTEXT_RELEASE_BEHAVIOR_FLUSH;
 724
 725    /** GL_ARB_tessellation_shader */
 726    consts->MaxTessGenLevel = MAX_TESS_GEN_LEVEL;
 727    consts->MaxPatchVertices = MAX_PATCH_VERTICES;
 728    consts->Program[MESA_SHADER_TESS_CTRL].MaxTextureImageUnits = MAX_TEXTURE_IMAGE_UNITS;
 729    consts->Program[MESA_SHADER_TESS_EVAL].MaxTextureImageUnits = MAX_TEXTURE_IMAGE_UNITS;
 730    consts->MaxTessPatchComponents = MAX_TESS_PATCH_COMPONENTS;
 731    consts->MaxTessControlTotalOutputComponents = MAX_TESS_CONTROL_TOTAL_OUTPUT_COMPONENTS;
 732    consts->PrimitiveRestartForPatches = false;
 733
 734    /** GL_ARB_compute_variable_group_size */
 735    consts->MaxComputeVariableGroupSize[0] = 512;
 736    consts->MaxComputeVariableGroupSize[1] = 512;
 737    consts->MaxComputeVariableGroupSize[2] = 64;
 738    consts->MaxComputeVariableGroupInvocations = 512;
 739
 740    /** GL_NV_conservative_raster */
 741    consts->MaxSubpixelPrecisionBiasBits = 0;
 742
 743    /** GL_NV_conservative_raster_dilate */
 744    consts->ConservativeRasterDilateRange[0] = 0.0;
 745    consts->ConservativeRasterDilateRange[0] = 0.0;
 746    consts->ConservativeRasterDilateGranularity = 0.0;
 747 }
 748
 749
 750 /**
 751  * Do some sanity checks on the limits/constants for the given context.
 752  * Only called the first time a context is bound.
 753  */
 754 static void
 755 check_context_limits(struct gl_context *ctx)
 756 {
 757    (void) ctx;
 758
 759    /* check that we don't exceed the size of various bitfields */
 760    assert(VARYING_SLOT_MAX <=
 761           (8 * sizeof(ctx->VertexProgram._Current->info.outputs_written)));
 762    assert(VARYING_SLOT_MAX <=
 763           (8 * sizeof(ctx->FragmentProgram._Current->info.inputs_read)));
 764
 765    /* shader-related checks */
 766    assert(ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxLocalParams <= MAX_PROGRAM_LOCAL_PARAMS);
 767    assert(ctx->Const.Program[MESA_SHADER_VERTEX].MaxLocalParams <= MAX_PROGRAM_LOCAL_PARAMS);
 768
 769    /* Texture unit checks */
 770    assert(ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits > 0);
 771    assert(ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits <= MAX_TEXTURE_IMAGE_UNITS);
 772    assert(ctx->Const.MaxTextureCoordUnits > 0);
 773    assert(ctx->Const.MaxTextureCoordUnits <= MAX_TEXTURE_COORD_UNITS);
 774    assert(ctx->Const.MaxTextureUnits > 0);
 775    assert(ctx->Const.MaxTextureUnits <= MAX_TEXTURE_IMAGE_UNITS);
 776    assert(ctx->Const.MaxTextureUnits <= MAX_TEXTURE_COORD_UNITS);
 777    assert(ctx->Const.MaxTextureUnits == MIN2(ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits,
 778                                              ctx->Const.MaxTextureCoordUnits));
 779    assert(ctx->Const.MaxCombinedTextureImageUnits > 0);
 780    assert(ctx->Const.MaxCombinedTextureImageUnits <= MAX_COMBINED_TEXTURE_IMAGE_UNITS);
 781    assert(ctx->Const.MaxTextureCoordUnits <= MAX_COMBINED_TEXTURE_IMAGE_UNITS);
 782    /* number of coord units cannot be greater than number of image units */
 783    assert(ctx->Const.MaxTextureCoordUnits <= ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits);
 784
 785
 786    /* Texture size checks */
 787    assert(ctx->Const.MaxTextureLevels <= MAX_TEXTURE_LEVELS);
 788    assert(ctx->Const.Max3DTextureLevels <= MAX_3D_TEXTURE_LEVELS);
 789    assert(ctx->Const.MaxCubeTextureLevels <= MAX_CUBE_TEXTURE_LEVELS);
 790    assert(ctx->Const.MaxTextureRectSize <= MAX_TEXTURE_RECT_SIZE);
 791
 792    /* Texture level checks */
 793    assert(MAX_TEXTURE_LEVELS >= MAX_3D_TEXTURE_LEVELS);
 794    assert(MAX_TEXTURE_LEVELS >= MAX_CUBE_TEXTURE_LEVELS);
 795
 796    /* Max texture size should be <= max viewport size (render to texture) */
 797    assert((1U << (ctx->Const.MaxTextureLevels - 1))
 798           <= ctx->Const.MaxViewportWidth);
 799    assert((1U << (ctx->Const.MaxTextureLevels - 1))
 800           <= ctx->Const.MaxViewportHeight);
 801
 802    assert(ctx->Const.MaxDrawBuffers <= MAX_DRAW_BUFFERS);
 803
 804    /* if this fails, add more enum values to gl_buffer_index */
 805    assert(BUFFER_COLOR0 + MAX_DRAW_BUFFERS <= BUFFER_COUNT);
 806
 807    /* XXX probably add more tests */
 808 }
 809
 810
 811 /**
 812  * Initialize the attribute groups in a GL context.
 813  *
 814  * \param ctx GL context.
 815  *
 816  * Initializes all the attributes, calling the respective <tt>init*</tt>
 817  * functions for the more complex data structures.
 818  */
 819 static GLboolean
 820 init_attrib_groups(struct gl_context *ctx)
 821 {
 822    assert(ctx);
 823
 824    /* Constants */
 825    _mesa_init_constants(&ctx->Const, ctx->API);
 826
 827    /* Extensions */
 828    _mesa_init_extensions(&ctx->Extensions);
 829
 830    /* Attribute Groups */
 831    _mesa_init_accum( ctx );
 832    _mesa_init_attrib( ctx );
 833    _mesa_init_bbox( ctx );
 834    _mesa_init_buffer_objects( ctx );
 835    _mesa_init_color( ctx );
 836    _mesa_init_conservative_raster( ctx );
 837    _mesa_init_current( ctx );
 838    _mesa_init_depth( ctx );
 839    _mesa_init_debug( ctx );
 840    _mesa_init_debug_output( ctx );
 841    _mesa_init_display_list( ctx );
 842    _mesa_init_eval( ctx );
 843    _mesa_init_fbobjects( ctx );
 844    _mesa_init_feedback( ctx );
 845    _mesa_init_fog( ctx );
 846    _mesa_init_hint( ctx );
 847    _mesa_init_image_units( ctx );
 848    _mesa_init_line( ctx );
 849    _mesa_init_lighting( ctx );
 850    _mesa_init_matrix( ctx );
 851    _mesa_init_multisample( ctx );
 852    _mesa_init_performance_monitors( ctx );
 853    _mesa_init_performance_queries( ctx );
 854    _mesa_init_pipeline( ctx );
 855    _mesa_init_pixel( ctx );
 856    _mesa_init_pixelstore( ctx );
 857    _mesa_init_point( ctx );
 858    _mesa_init_polygon( ctx );
 859    _mesa_init_program( ctx );
 860    _mesa_init_queryobj( ctx );
 861    _mesa_init_sync( ctx );
 862    _mesa_init_rastpos( ctx );
 863    _mesa_init_scissor( ctx );
 864    _mesa_init_shader_state( ctx );
 865    _mesa_init_stencil( ctx );
 866    _mesa_init_transform( ctx );
 867    _mesa_init_transform_feedback( ctx );
 868    _mesa_init_varray( ctx );
 869    _mesa_init_viewport( ctx );
 870    _mesa_init_resident_handles( ctx );
 871
 872    if (!_mesa_init_texture( ctx ))
 873       return GL_FALSE;
 874
 875    /* Miscellaneous */
 876    ctx->TileRasterOrderIncreasingX = GL_TRUE;
 877    ctx->TileRasterOrderIncreasingY = GL_TRUE;
 878    ctx->NewState = _NEW_ALL;
 879    ctx->NewDriverState = ~0;
 880    ctx->ErrorValue = GL_NO_ERROR;
 881    ctx->ShareGroupReset = false;
 882    ctx->varying_vp_inputs = VERT_BIT_ALL;
 883
 884    return GL_TRUE;
 885 }
 886
 887
 888 /**
 889  * Update default objects in a GL context with respect to shared state.
 890  *
 891  * \param ctx GL context.
 892  *
 893  * Removes references to old default objects, (texture objects, program
 894  * objects, etc.) and changes to reference those from the current shared
 895  * state.
 896  */
 897 static GLboolean
 898 update_default_objects(struct gl_context *ctx)
 899 {
 900    assert(ctx);
 901
 902    _mesa_update_default_objects_program(ctx);
 903    _mesa_update_default_objects_texture(ctx);
 904    _mesa_update_default_objects_buffer_objects(ctx);
 905
 906    return GL_TRUE;
 907 }
 908
 909
 910 /* XXX this is temporary and should be removed at some point in the
 911  * future when there's a reasonable expectation that the libGL library
 912  * contains the _glapi_new_nop_table() and _glapi_set_nop_handler()
 913  * functions which were added in Mesa 10.6.
 914  */
 915 #if !defined(_WIN32)
 916 /* Avoid libGL / driver ABI break */
 917 #define USE_GLAPI_NOP_FEATURES 0
 918 #else
 919 #define USE_GLAPI_NOP_FEATURES 1
 920 #endif
 921
 922
 923 /**
 924  * This function is called by the glapi no-op functions.  For each OpenGL
 925  * function/entrypoint there's a simple no-op function.  These "no-op"
 926  * functions call this function.
 927  *
 928  * If there's a current OpenGL context for the calling thread, we record a
 929  * GL_INVALID_OPERATION error.  This can happen either because the app's
 930  * calling an unsupported extension function, or calling an illegal function
 931  * (such as glClear between glBegin/glEnd).
 932  *
 933  * If there's no current OpenGL context for the calling thread, we can
 934  * print a message to stderr.
 935  *
 936  * \param name  the name of the OpenGL function
 937  */
 938 #if USE_GLAPI_NOP_FEATURES
 939 static void
 940 nop_handler(const char *name)
 941 {
 942    GET_CURRENT_CONTEXT(ctx);
 943    if (ctx) {
 944       _mesa_error(ctx, GL_INVALID_OPERATION, "%s(invalid call)", name);
 945    }
 946 #if defined(DEBUG)
 947    else if (getenv("MESA_DEBUG") || getenv("LIBGL_DEBUG")) {
 948       fprintf(stderr,
 949               "GL User Error: gl%s called without a rendering context\n",
 950               name);
 951       fflush(stderr);
 952    }
 953 #endif
 954 }
 955 #endif
 956
 957
 958 /**
 959  * Special no-op glFlush, see below.
 960  */
 961 #if defined(_WIN32)
 962 static void GLAPIENTRY
 963 nop_glFlush(void)
 964 {
 965    /* don't record an error like we do in nop_handler() */
 966 }
 967 #endif
 968
 969
 970 #if !USE_GLAPI_NOP_FEATURES
 971 static int
 972 generic_nop(void)
 973 {
 974    GET_CURRENT_CONTEXT(ctx);
 975    _mesa_error(ctx, GL_INVALID_OPERATION,
 976                "unsupported function called "
 977                "(unsupported extension or deprecated function?)");
 978    return 0;
 979 }
 980 #endif
 981
 982
 983 /**
 984  * Create a new API dispatch table in which all entries point to the
 985  * generic_nop() function.  This will not work on Windows because of
 986  * the __stdcall convention which requires the callee to clean up the
 987  * call stack.  That's impossible with one generic no-op function.
 988  */
 989 struct _glapi_table *
 990 _mesa_new_nop_table(unsigned numEntries)
 991 {
 992    struct _glapi_table *table;
 993
 994 #if !USE_GLAPI_NOP_FEATURES
 995    table = malloc(numEntries * sizeof(_glapi_proc));
 996    if (table) {
 997       _glapi_proc *entry = (_glapi_proc *) table;
 998       unsigned i;
 999       for (i = 0; i < numEntries; i++) {
1000          entry[i] = (_glapi_proc) generic_nop;
1001       }
1002    }
1003 #else
1004    table = _glapi_new_nop_table(numEntries);
1005 #endif
1006    return table;
1007 }
1008
1009
1010 /**
1011  * Allocate and initialize a new dispatch table.  The table will be
1012  * populated with pointers to "no-op" functions.  In turn, the no-op
1013  * functions will call nop_handler() above.
1014  */
1015 struct _glapi_table *
1016 _mesa_alloc_dispatch_table(void)
1017 {
1018    /* Find the larger of Mesa's dispatch table and libGL's dispatch table.
1019     * In practice, this'll be the same for stand-alone Mesa.  But for DRI
1020     * Mesa we do this to accommodate different versions of libGL and various
1021     * DRI drivers.
1022     */
1023    int numEntries = MAX2(_glapi_get_dispatch_table_size(), _gloffset_COUNT);
1024
1025    struct _glapi_table *table = _mesa_new_nop_table(numEntries);
1026
1027 #if defined(_WIN32)
1028    if (table) {
1029       /* This is a special case for Windows in the event that
1030        * wglGetProcAddress is called between glBegin/End().
1031        *
1032        * The MS opengl32.dll library apparently calls glFlush from
1033        * wglGetProcAddress().  If we're inside glBegin/End(), glFlush
1034        * will dispatch to _mesa_generic_nop() and we'll generate a
1035        * GL_INVALID_OPERATION error.
1036        *
1037        * The specific case which hits this is piglit's primitive-restart
1038        * test which calls glPrimitiveRestartNV() inside glBegin/End.  The
1039        * first time we call glPrimitiveRestartNV() Piglit's API dispatch
1040        * code will try to resolve the function by calling wglGetProcAddress.
1041        * This raises GL_INVALID_OPERATION and an assert(glGetError()==0)
1042        * will fail causing the test to fail.  By suppressing the error, the
1043        * assertion passes and the test continues.
1044        */
1045       SET_Flush(table, nop_glFlush);
1046    }
1047 #endif
1048
1049 #if USE_GLAPI_NOP_FEATURES
1050    _glapi_set_nop_handler(nop_handler);
1051 #endif
1052
1053    return table;
1054 }
1055
1056 /**
1057  * Creates a minimal dispatch table for use within glBegin()/glEnd().
1058  *
1059  * This ensures that we generate GL_INVALID_OPERATION errors from most
1060  * functions, since the set of functions that are valid within Begin/End is
1061  * very small.
1062  *
1063  * From the GL 1.0 specification section 2.6.3, "GL Commands within
1064  * Begin/End"
1065  *
1066  *     "The only GL commands that are allowed within any Begin/End pairs are
1067  *      the commands for specifying vertex coordinates, vertex color, normal
1068  *      coordinates, and texture coordinates (Vertex, Color, Index, Normal,
1069  *      TexCoord), EvalCoord and EvalPoint commands (see section 5.1),
1070  *      commands for specifying lighting material parameters (Material
1071  *      commands see section 2.12.2), display list invocation commands
1072  *      (CallList and CallLists see section 5.4), and the EdgeFlag
1073  *      command. Executing Begin after Begin has already been executed but
1074  *      before an End is issued generates the INVALID OPERATION error, as does
1075  *      executing End without a previous corresponding Begin. Executing any
1076  *      other GL command within Begin/End results in the error INVALID
1077  *      OPERATION."
1078  *
1079  * The table entries for specifying vertex attributes are set up by
1080  * install_vtxfmt() and _mesa_loopback_init_api_table(), and End() and dlists
1081  * are set by install_vtxfmt() as well.
1082  */
1083 static struct _glapi_table *
1084 create_beginend_table(const struct gl_context *ctx)
1085 {
1086    struct _glapi_table *table;
1087
1088    table = _mesa_alloc_dispatch_table();
1089    if (!table)
1090       return NULL;
1091
1092    /* Fill in functions which return a value, since they should return some
1093     * specific value even if they emit a GL_INVALID_OPERATION error from them
1094     * being called within glBegin()/glEnd().
1095     */
1096 #define COPY_DISPATCH(func) SET_##func(table, GET_##func(ctx->Exec))
1097
1098    COPY_DISPATCH(GenLists);
1099    COPY_DISPATCH(IsProgram);
1100    COPY_DISPATCH(IsVertexArray);
1101    COPY_DISPATCH(IsBuffer);
1102    COPY_DISPATCH(IsEnabled);
1103    COPY_DISPATCH(IsEnabledi);
1104    COPY_DISPATCH(IsRenderbuffer);
1105    COPY_DISPATCH(IsFramebuffer);
1106    COPY_DISPATCH(CheckFramebufferStatus);
1107    COPY_DISPATCH(RenderMode);
1108    COPY_DISPATCH(GetString);
1109    COPY_DISPATCH(GetStringi);
1110    COPY_DISPATCH(GetPointerv);
1111    COPY_DISPATCH(IsQuery);
1112    COPY_DISPATCH(IsSampler);
1113    COPY_DISPATCH(IsSync);
1114    COPY_DISPATCH(IsTexture);
1115    COPY_DISPATCH(IsTransformFeedback);
1116    COPY_DISPATCH(DeleteQueries);
1117    COPY_DISPATCH(AreTexturesResident);
1118    COPY_DISPATCH(FenceSync);
1119    COPY_DISPATCH(ClientWaitSync);
1120    COPY_DISPATCH(MapBuffer);
1121    COPY_DISPATCH(UnmapBuffer);
1122    COPY_DISPATCH(MapBufferRange);
1123    COPY_DISPATCH(ObjectPurgeableAPPLE);
1124    COPY_DISPATCH(ObjectUnpurgeableAPPLE);
1125
1126    _mesa_loopback_init_api_table(ctx, table);
1127
1128    return table;
1129 }
1130
1131 void
1132 _mesa_initialize_dispatch_tables(struct gl_context *ctx)
1133 {
1134    /* Do the code-generated setup of the exec table in api_exec.c. */
1135    _mesa_initialize_exec_table(ctx);
1136
1137    if (ctx->Save)
1138       _mesa_initialize_save_table(ctx);
1139 }
1140
1141 /**
1142  * Initialize a struct gl_context struct (rendering context).
1143  *
1144  * This includes allocating all the other structs and arrays which hang off of
1145  * the context by pointers.
1146  * Note that the driver needs to pass in its dd_function_table here since
1147  * we need to at least call driverFunctions->NewTextureObject to create the
1148  * default texture objects.
1149  *
1150  * Called by _mesa_create_context().
1151  *
1152  * Performs the imports and exports callback tables initialization, and
1153  * miscellaneous one-time initializations. If no shared context is supplied one
1154  * is allocated, and increase its reference count.  Setups the GL API dispatch
1155  * tables.  Initialize the TNL module. Sets the maximum Z buffer depth.
1156  * Finally queries the \c MESA_DEBUG and \c MESA_VERBOSE environment variables
1157  * for debug flags.
1158  *
1159  * \param ctx the context to initialize
1160  * \param api the GL API type to create the context for
1161  * \param visual describes the visual attributes for this context or NULL to
1162  *               create a configless context
1163  * \param share_list points to context to share textures, display lists,
1164  *        etc with, or NULL
1165  * \param driverFunctions table of device driver functions for this context
1166  *        to use
1167  */
1168 GLboolean
1169 _mesa_initialize_context(struct gl_context *ctx,
1170                          gl_api api,
1171                          const struct gl_config *visual,
1172                          struct gl_context *share_list,
1173                          const struct dd_function_table *driverFunctions)
1174 {
1175    struct gl_shared_state *shared;
1176    int i;
1177
1178    assert(driverFunctions->NewTextureObject);
1179    assert(driverFunctions->FreeTextureImageBuffer);
1180
1181    ctx->API = api;
1182    ctx->DrawBuffer = NULL;
1183    ctx->ReadBuffer = NULL;
1184    ctx->WinSysDrawBuffer = NULL;
1185    ctx->WinSysReadBuffer = NULL;
1186
1187    if (visual) {
1188       ctx->Visual = *visual;
1189       ctx->HasConfig = GL_TRUE;
1190    }
1191    else {
1192       memset(&ctx->Visual, 0, sizeof ctx->Visual);
1193       ctx->HasConfig = GL_FALSE;
1194    }
1195
1196    _mesa_override_gl_version(ctx);
1197
1198    /* misc one-time initializations */
1199    one_time_init(ctx);
1200
1201    /* Plug in driver functions and context pointer here.
1202     * This is important because when we call alloc_shared_state() below
1203     * we'll call ctx->Driver.NewTextureObject() to create the default
1204     * textures.
1205     */
1206    ctx->Driver = *driverFunctions;
1207
1208    if (share_list) {
1209       /* share state with another context */
1210       shared = share_list->Shared;
1211    }
1212    else {
1213       /* allocate new, unshared state */
1214       shared = _mesa_alloc_shared_state(ctx);
1215       if (!shared)
1216          return GL_FALSE;
1217    }
1218
1219    _mesa_reference_shared_state(ctx, &ctx->Shared, shared);
1220
1221    if (!init_attrib_groups( ctx ))
1222       goto fail;
1223
1224    /* KHR_no_error is likely to crash, overflow memory, etc if an application
1225     * has errors so don't enable it for setuid processes.
1226     */
1227    if (env_var_as_boolean("MESA_NO_ERROR", false)) {
1228 #if !defined(_WIN32)
1229       if (geteuid() == getuid())
1230 #endif
1231          ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_NO_ERROR_BIT_KHR;
1232    }
1233
1234    /* setup the API dispatch tables with all nop functions */
1235    ctx->OutsideBeginEnd = _mesa_alloc_dispatch_table();
1236    if (!ctx->OutsideBeginEnd)
1237       goto fail;
1238    ctx->Exec = ctx->OutsideBeginEnd;
1239    ctx->CurrentClientDispatch = ctx->CurrentServerDispatch = ctx->OutsideBeginEnd;
1240
1241    ctx->FragmentProgram._MaintainTexEnvProgram
1242       = (getenv("MESA_TEX_PROG") != NULL);
1243
1244    ctx->VertexProgram._MaintainTnlProgram
1245       = (getenv("MESA_TNL_PROG") != NULL);
1246    if (ctx->VertexProgram._MaintainTnlProgram) {
1247       /* this is required... */
1248       ctx->FragmentProgram._MaintainTexEnvProgram = GL_TRUE;
1249    }
1250
1251    /* Mesa core handles all the formats that mesa core knows about.
1252     * Drivers will want to override this list with just the formats
1253     * they can handle, and confirm that appropriate fallbacks exist in
1254     * _mesa_choose_tex_format().
1255     */
1256    memset(&ctx->TextureFormatSupported, GL_TRUE,
1257           sizeof(ctx->TextureFormatSupported));
1258
1259    switch (ctx->API) {
1260    case API_OPENGL_COMPAT:
1261       ctx->BeginEnd = create_beginend_table(ctx);
1262       ctx->Save = _mesa_alloc_dispatch_table();
1263       if (!ctx->BeginEnd || !ctx->Save)
1264          goto fail;
1265
1266       /* fall-through */
1267    case API_OPENGL_CORE:
1268       break;
1269    case API_OPENGLES:
1270       /**
1271        * GL_OES_texture_cube_map says
1272        * "Initially all texture generation modes are set to REFLECTION_MAP_OES"
1273        */
1274       for (i = 0; i < ARRAY_SIZE(ctx->Texture.FixedFuncUnit); i++) {
1275          struct gl_fixedfunc_texture_unit *texUnit =
1276             &ctx->Texture.FixedFuncUnit[i];
1277
1278          texUnit->GenS.Mode = GL_REFLECTION_MAP_NV;
1279          texUnit->GenT.Mode = GL_REFLECTION_MAP_NV;
1280          texUnit->GenR.Mode = GL_REFLECTION_MAP_NV;
1281          texUnit->GenS._ModeBit = TEXGEN_REFLECTION_MAP_NV;
1282          texUnit->GenT._ModeBit = TEXGEN_REFLECTION_MAP_NV;
1283          texUnit->GenR._ModeBit = TEXGEN_REFLECTION_MAP_NV;
1284       }
1285       break;
1286    case API_OPENGLES2:
1287       ctx->FragmentProgram._MaintainTexEnvProgram = GL_TRUE;
1288       ctx->VertexProgram._MaintainTnlProgram = GL_TRUE;
1289       break;
1290    }
1291
1292    ctx->FirstTimeCurrent = GL_TRUE;
1293
1294    return GL_TRUE;
1295
1296 fail:
1297    _mesa_reference_shared_state(ctx, &ctx->Shared, NULL);
1298    free(ctx->BeginEnd);
1299    free(ctx->OutsideBeginEnd);
1300    free(ctx->Save);
1301    return GL_FALSE;
1302 }
1303
1304
1305 /**
1306  * Free the data associated with the given context.
1307  *
1308  * But doesn't free the struct gl_context struct itself.
1309  *
1310  * \sa _mesa_initialize_context() and init_attrib_groups().
1311  */
1312 void
1313 _mesa_free_context_data( struct gl_context *ctx )
1314 {
1315    if (!_mesa_get_current_context()){
1316       /* No current context, but we may need one in order to delete
1317        * texture objs, etc.  So temporarily bind the context now.
1318        */
1319       _mesa_make_current(ctx, NULL, NULL);
1320    }
1321
1322    /* unreference WinSysDraw/Read buffers */
1323    _mesa_reference_framebuffer(&ctx->WinSysDrawBuffer, NULL);
1324    _mesa_reference_framebuffer(&ctx->WinSysReadBuffer, NULL);
1325    _mesa_reference_framebuffer(&ctx->DrawBuffer, NULL);
1326    _mesa_reference_framebuffer(&ctx->ReadBuffer, NULL);
1327
1328    _mesa_reference_program(ctx, &ctx->VertexProgram.Current, NULL);
1329    _mesa_reference_program(ctx, &ctx->VertexProgram._Current, NULL);
1330    _mesa_reference_program(ctx, &ctx->VertexProgram._TnlProgram, NULL);
1331
1332    _mesa_reference_program(ctx, &ctx->TessCtrlProgram._Current, NULL);
1333    _mesa_reference_program(ctx, &ctx->TessEvalProgram._Current, NULL);
1334    _mesa_reference_program(ctx, &ctx->GeometryProgram._Current, NULL);
1335
1336    _mesa_reference_program(ctx, &ctx->FragmentProgram.Current, NULL);
1337    _mesa_reference_program(ctx, &ctx->FragmentProgram._Current, NULL);
1338    _mesa_reference_program(ctx, &ctx->FragmentProgram._TexEnvProgram, NULL);
1339
1340    _mesa_reference_program(ctx, &ctx->ComputeProgram._Current, NULL);
1341
1342    _mesa_reference_vao(ctx, &ctx->Array.VAO, NULL);
1343    _mesa_reference_vao(ctx, &ctx->Array.DefaultVAO, NULL);
1344    _mesa_reference_vao(ctx, &ctx->Array._EmptyVAO, NULL);
1345    _mesa_reference_vao(ctx, &ctx->Array._DrawVAO, NULL);
1346
1347    _mesa_free_attrib_data(ctx);
1348    _mesa_free_buffer_objects(ctx);
1349    _mesa_free_eval_data( ctx );
1350    _mesa_free_texture_data( ctx );
1351    _mesa_free_matrix_data( ctx );
1352    _mesa_free_pipeline_data(ctx);
1353    _mesa_free_program_data(ctx);
1354    _mesa_free_shader_state(ctx);
1355    _mesa_free_queryobj_data(ctx);
1356    _mesa_free_sync_data(ctx);
1357    _mesa_free_varray_data(ctx);
1358    _mesa_free_transform_feedback(ctx);
1359    _mesa_free_performance_monitors(ctx);
1360    _mesa_free_performance_queries(ctx);
1361    _mesa_free_resident_handles(ctx);
1362
1363    _mesa_reference_buffer_object(ctx, &ctx->Pack.BufferObj, NULL);
1364    _mesa_reference_buffer_object(ctx, &ctx->Unpack.BufferObj, NULL);
1365    _mesa_reference_buffer_object(ctx, &ctx->DefaultPacking.BufferObj, NULL);
1366    _mesa_reference_buffer_object(ctx, &ctx->Array.ArrayBufferObj, NULL);
1367
1368    /* free dispatch tables */
1369    free(ctx->BeginEnd);
1370    free(ctx->OutsideBeginEnd);
1371    free(ctx->Save);
1372    free(ctx->ContextLost);
1373    free(ctx->MarshalExec);
1374
1375    /* Shared context state (display lists, textures, etc) */
1376    _mesa_reference_shared_state(ctx, &ctx->Shared, NULL);
1377
1378    /* needs to be after freeing shared state */
1379    _mesa_free_display_list_data(ctx);
1380
1381    _mesa_free_errors_data(ctx);
1382
1383    free((void *)ctx->Extensions.String);
1384
1385    free(ctx->VersionString);
1386
1387    /* unbind the context if it's currently bound */
1388    if (ctx == _mesa_get_current_context()) {
1389       _mesa_make_current(NULL, NULL, NULL);
1390    }
1391 }
1392
1393
1394 /**
1395  * Destroy a struct gl_context structure.
1396  *
1397  * \param ctx GL context.
1398  *
1399  * Calls _mesa_free_context_data() and frees the gl_context object itself.
1400  */
1401 void
1402 _mesa_destroy_context( struct gl_context *ctx )
1403 {
1404    if (ctx) {
1405       _mesa_free_context_data(ctx);
1406       free( (void *) ctx );
1407    }
1408 }
1409
1410
1411 /**
1412  * Copy attribute groups from one context to another.
1413  *
1414  * \param src source context
1415  * \param dst destination context
1416  * \param mask bitwise OR of GL_*_BIT flags
1417  *
1418  * According to the bits specified in \p mask, copies the corresponding
1419  * attributes from \p src into \p dst.  For many of the attributes a simple \c
1420  * memcpy is not enough due to the existence of internal pointers in their data
1421  * structures.
1422  */
1423 void
1424 _mesa_copy_context( const struct gl_context *src, struct gl_context *dst,
1425                     GLuint mask )
1426 {
1427    if (mask & GL_ACCUM_BUFFER_BIT) {
1428       /* OK to memcpy */
1429       dst->Accum = src->Accum;
1430    }
1431    if (mask & GL_COLOR_BUFFER_BIT) {
1432       /* OK to memcpy */
1433       dst->Color = src->Color;
1434    }
1435    if (mask & GL_CURRENT_BIT) {
1436       /* OK to memcpy */
1437       dst->Current = src->Current;
1438    }
1439    if (mask & GL_DEPTH_BUFFER_BIT) {
1440       /* OK to memcpy */
1441       dst->Depth = src->Depth;
1442    }
1443    if (mask & GL_ENABLE_BIT) {
1444       /* no op */
1445    }
1446    if (mask & GL_EVAL_BIT) {
1447       /* OK to memcpy */
1448       dst->Eval = src->Eval;
1449    }
1450    if (mask & GL_FOG_BIT) {
1451       /* OK to memcpy */
1452       dst->Fog = src->Fog;
1453    }
1454    if (mask & GL_HINT_BIT) {
1455       /* OK to memcpy */
1456       dst->Hint = src->Hint;
1457    }
1458    if (mask & GL_LIGHTING_BIT) {
1459       /* OK to memcpy */
1460       dst->Light = src->Light;
1461    }
1462    if (mask & GL_LINE_BIT) {
1463       /* OK to memcpy */
1464       dst->Line = src->Line;
1465    }
1466    if (mask & GL_LIST_BIT) {
1467       /* OK to memcpy */
1468       dst->List = src->List;
1469    }
1470    if (mask & GL_PIXEL_MODE_BIT) {
1471       /* OK to memcpy */
1472       dst->Pixel = src->Pixel;
1473    }
1474    if (mask & GL_POINT_BIT) {
1475       /* OK to memcpy */
1476       dst->Point = src->Point;
1477    }
1478    if (mask & GL_POLYGON_BIT) {
1479       /* OK to memcpy */
1480       dst->Polygon = src->Polygon;
1481    }
1482    if (mask & GL_POLYGON_STIPPLE_BIT) {
1483       /* Use loop instead of memcpy due to problem with Portland Group's
1484        * C compiler.  Reported by John Stone.
1485        */
1486       GLuint i;
1487       for (i = 0; i < 32; i++) {
1488          dst->PolygonStipple[i] = src->PolygonStipple[i];
1489       }
1490    }
1491    if (mask & GL_SCISSOR_BIT) {
1492       /* OK to memcpy */
1493       dst->Scissor = src->Scissor;
1494    }
1495    if (mask & GL_STENCIL_BUFFER_BIT) {
1496       /* OK to memcpy */
1497       dst->Stencil = src->Stencil;
1498    }
1499    if (mask & GL_TEXTURE_BIT) {
1500       /* Cannot memcpy because of pointers */
1501       _mesa_copy_texture_state(src, dst);
1502    }
1503    if (mask & GL_TRANSFORM_BIT) {
1504       /* OK to memcpy */
1505       dst->Transform = src->Transform;
1506    }
1507    if (mask & GL_VIEWPORT_BIT) {
1508       unsigned i;
1509       for (i = 0; i < src->Const.MaxViewports; i++) {
1510          /* OK to memcpy */
1511          dst->ViewportArray[i] = src->ViewportArray[i];
1512       }
1513    }
1514
1515    /* XXX FIXME:  Call callbacks?
1516     */
1517    dst->NewState = _NEW_ALL;
1518    dst->NewDriverState = ~0;
1519 }
1520
1521
1522 /**
1523  * Check if the given context can render into the given framebuffer
1524  * by checking visual attributes.
1525  *
1526  * \return GL_TRUE if compatible, GL_FALSE otherwise.
1527  */
1528 static GLboolean
1529 check_compatible(const struct gl_context *ctx,
1530                  const struct gl_framebuffer *buffer)
1531 {
1532    const struct gl_config *ctxvis = &ctx->Visual;
1533    const struct gl_config *bufvis = &buffer->Visual;
1534
1535    if (buffer == _mesa_get_incomplete_framebuffer())
1536       return GL_TRUE;
1537
1538 #define check_component(foo)           \
1539    if (ctxvis->foo && bufvis->foo &&   \
1540        ctxvis->foo != bufvis->foo)     \
1541       return GL_FALSE
1542
1543    check_component(redMask);
1544    check_component(greenMask);
1545    check_component(blueMask);
1546    check_component(depthBits);
1547    check_component(stencilBits);
1548
1549 #undef check_component
1550
1551    return GL_TRUE;
1552 }
1553
1554
1555 /**
1556  * Check if the viewport/scissor size has not yet been initialized.
1557  * Initialize the size if the given width and height are non-zero.
1558  */
1559 static void
1560 check_init_viewport(struct gl_context *ctx, GLuint width, GLuint height)
1561 {
1562    if (!ctx->ViewportInitialized && width > 0 && height > 0) {
1563       unsigned i;
1564
1565       /* Note: set flag here, before calling _mesa_set_viewport(), to prevent
1566        * potential infinite recursion.
1567        */
1568       ctx->ViewportInitialized = GL_TRUE;
1569
1570       /* Note: ctx->Const.MaxViewports may not have been set by the driver
1571        * yet, so just initialize all of them.
1572        */
1573       for (i = 0; i < MAX_VIEWPORTS; i++) {
1574          _mesa_set_viewport(ctx, i, 0, 0, width, height);
1575          _mesa_set_scissor(ctx, i, 0, 0, width, height);
1576       }
1577    }
1578 }
1579
1580
1581 static void
1582 handle_first_current(struct gl_context *ctx)
1583 {
1584    if (ctx->Version == 0 || !ctx->DrawBuffer) {
1585       /* probably in the process of tearing down the context */
1586       return;
1587    }
1588
1589    check_context_limits(ctx);
1590
1591    _mesa_update_vertex_processing_mode(ctx);
1592
1593    /* According to GL_MESA_configless_context the default value of
1594     * glDrawBuffers depends on the config of the first surface it is bound to.
1595     * For GLES it is always GL_BACK which has a magic interpretation.
1596     */
1597    if (!ctx->HasConfig && _mesa_is_desktop_gl(ctx)) {
1598       if (ctx->DrawBuffer != _mesa_get_incomplete_framebuffer()) {
1599          GLenum16 buffer;
1600
1601          if (ctx->DrawBuffer->Visual.doubleBufferMode)
1602             buffer = GL_BACK;
1603          else
1604             buffer = GL_FRONT;
1605
1606          _mesa_drawbuffers(ctx, ctx->DrawBuffer, 1, &buffer,
1607                            NULL /* destMask */);
1608       }
1609
1610       if (ctx->ReadBuffer != _mesa_get_incomplete_framebuffer()) {
1611          gl_buffer_index bufferIndex;
1612          GLenum buffer;
1613
1614          if (ctx->ReadBuffer->Visual.doubleBufferMode) {
1615             buffer = GL_BACK;
1616             bufferIndex = BUFFER_BACK_LEFT;
1617          }
1618          else {
1619             buffer = GL_FRONT;
1620             bufferIndex = BUFFER_FRONT_LEFT;
1621          }
1622
1623          _mesa_readbuffer(ctx, ctx->ReadBuffer, buffer, bufferIndex);
1624       }
1625    }
1626
1627    /* Determine if generic vertex attribute 0 aliases the conventional
1628     * glVertex position.
1629     */
1630    {
1631       const bool is_forward_compatible_context =
1632          ctx->Const.ContextFlags & GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT;
1633
1634       /* In OpenGL 3.1 attribute 0 becomes non-magic, just like in OpenGL ES
1635        * 2.0.  Note that we cannot just check for API_OPENGL_COMPAT here because
1636        * that will erroneously allow this usage in a 3.0 forward-compatible
1637        * context too.
1638        */
1639       ctx->_AttribZeroAliasesVertex = (ctx->API == API_OPENGLES
1640                                        || (ctx->API == API_OPENGL_COMPAT
1641                                            && !is_forward_compatible_context));
1642    }
1643
1644    /* We can use this to help debug user's problems.  Tell them to set
1645     * the MESA_INFO env variable before running their app.  Then the
1646     * first time each context is made current we'll print some useful
1647     * information.
1648     */
1649    if (getenv("MESA_INFO")) {
1650       _mesa_print_info(ctx);
1651    }
1652 }
1653
1654 /**
1655  * Bind the given context to the given drawBuffer and readBuffer and
1656  * make it the current context for the calling thread.
1657  * We'll render into the drawBuffer and read pixels from the
1658  * readBuffer (i.e. glRead/CopyPixels, glCopyTexImage, etc).
1659  *
1660  * We check that the context's and framebuffer's visuals are compatible
1661  * and return immediately if they're not.
1662  *
1663  * \param newCtx  the new GL context. If NULL then there will be no current GL
1664  *                context.
1665  * \param drawBuffer  the drawing framebuffer
1666  * \param readBuffer  the reading framebuffer
1667  */
1668 GLboolean
1669 _mesa_make_current( struct gl_context *newCtx,
1670                     struct gl_framebuffer *drawBuffer,
1671                     struct gl_framebuffer *readBuffer )
1672 {
1673    GET_CURRENT_CONTEXT(curCtx);
1674
1675    if (MESA_VERBOSE & VERBOSE_API)
1676       _mesa_debug(newCtx, "_mesa_make_current()\n");
1677
1678    /* Check that the context's and framebuffer's visuals are compatible.
1679     */
1680    if (newCtx && drawBuffer && newCtx->WinSysDrawBuffer != drawBuffer) {
1681       if (!check_compatible(newCtx, drawBuffer)) {
1682          _mesa_warning(newCtx,
1683               "MakeCurrent: incompatible visuals for context and drawbuffer");
1684          return GL_FALSE;
1685       }
1686    }
1687    if (newCtx && readBuffer && newCtx->WinSysReadBuffer != readBuffer) {
1688       if (!check_compatible(newCtx, readBuffer)) {
1689          _mesa_warning(newCtx,
1690               "MakeCurrent: incompatible visuals for context and readbuffer");
1691          return GL_FALSE;
1692       }
1693    }
1694
1695    if (curCtx &&
1696        (curCtx->WinSysDrawBuffer || curCtx->WinSysReadBuffer) &&
1697        /* make sure this context is valid for flushing */
1698        curCtx != newCtx &&
1699        curCtx->Const.ContextReleaseBehavior ==
1700        GL_CONTEXT_RELEASE_BEHAVIOR_FLUSH) {
1701       _mesa_flush(curCtx);
1702    }
1703
1704    /* We used to call _glapi_check_multithread() here.  Now do it in drivers */
1705
1706    if (!newCtx) {
1707       _glapi_set_dispatch(NULL);  /* none current */
1708       /* We need old ctx to correctly release Draw/ReadBuffer
1709        * and avoid a surface leak in st_renderbuffer_delete.
1710        * Therefore, first drop buffers then set new ctx to NULL.
1711        */
1712       if (curCtx) {
1713          _mesa_reference_framebuffer(&curCtx->WinSysDrawBuffer, NULL);
1714          _mesa_reference_framebuffer(&curCtx->WinSysReadBuffer, NULL);
1715       }
1716       _glapi_set_context(NULL);
1717       assert(_mesa_get_current_context() == NULL);
1718    }
1719    else {
1720       _glapi_set_context((void *) newCtx);
1721       assert(_mesa_get_current_context() == newCtx);
1722       _glapi_set_dispatch(newCtx->CurrentClientDispatch);
1723
1724       if (drawBuffer && readBuffer) {
1725          assert(_mesa_is_winsys_fbo(drawBuffer));
1726          assert(_mesa_is_winsys_fbo(readBuffer));
1727          _mesa_reference_framebuffer(&newCtx->WinSysDrawBuffer, drawBuffer);
1728          _mesa_reference_framebuffer(&newCtx->WinSysReadBuffer, readBuffer);
1729
1730          /*
1731           * Only set the context's Draw/ReadBuffer fields if they're NULL
1732           * or not bound to a user-created FBO.
1733           */
1734          if (!newCtx->DrawBuffer || _mesa_is_winsys_fbo(newCtx->DrawBuffer)) {
1735             _mesa_reference_framebuffer(&newCtx->DrawBuffer, drawBuffer);
1736             /* Update the FBO's list of drawbuffers/renderbuffers.
1737              * For winsys FBOs this comes from the GL state (which may have
1738              * changed since the last time this FBO was bound).
1739              */
1740             _mesa_update_draw_buffers(newCtx);
1741          }
1742          if (!newCtx->ReadBuffer || _mesa_is_winsys_fbo(newCtx->ReadBuffer)) {
1743             _mesa_reference_framebuffer(&newCtx->ReadBuffer, readBuffer);
1744             /* In _mesa_initialize_window_framebuffer, for single-buffered
1745              * visuals, the ColorReadBuffer is set to be GL_FRONT, even with
1746              * GLES contexts. When calling read_buffer, we verify we are reading
1747              * from GL_BACK in is_legal_es3_readbuffer_enum.  But the default is
1748              * incorrect, and certain dEQP tests check this.  So fix it here.
1749              */
1750             if (_mesa_is_gles(newCtx) &&
1751                !newCtx->ReadBuffer->Visual.doubleBufferMode)
1752                if (newCtx->ReadBuffer->ColorReadBuffer == GL_FRONT)
1753                   newCtx->ReadBuffer->ColorReadBuffer = GL_BACK;
1754          }
1755
1756          /* XXX only set this flag if we're really changing the draw/read
1757           * framebuffer bindings.
1758           */
1759          newCtx->NewState |= _NEW_BUFFERS;
1760
1761          check_init_viewport(newCtx, drawBuffer->Width, drawBuffer->Height);
1762       }
1763
1764       if (newCtx->FirstTimeCurrent) {
1765          handle_first_current(newCtx);
1766          newCtx->FirstTimeCurrent = GL_FALSE;
1767       }
1768    }
1769
1770    return GL_TRUE;
1771 }
1772
1773
1774 /**
1775  * Make context 'ctx' share the display lists, textures and programs
1776  * that are associated with 'ctxToShare'.
1777  * Any display lists, textures or programs associated with 'ctx' will
1778  * be deleted if nobody else is sharing them.
1779  */
1780 GLboolean
1781 _mesa_share_state(struct gl_context *ctx, struct gl_context *ctxToShare)
1782 {
1783    if (ctx && ctxToShare && ctx->Shared && ctxToShare->Shared) {
1784       struct gl_shared_state *oldShared = NULL;
1785
1786       /* save ref to old state to prevent it from being deleted immediately */
1787       _mesa_reference_shared_state(ctx, &oldShared, ctx->Shared);
1788
1789       /* update ctx's Shared pointer */
1790       _mesa_reference_shared_state(ctx, &ctx->Shared, ctxToShare->Shared);
1791
1792       update_default_objects(ctx);
1793
1794       /* release the old shared state */
1795       _mesa_reference_shared_state(ctx, &oldShared, NULL);
1796
1797       return GL_TRUE;
1798    }
1799    else {
1800       return GL_FALSE;
1801    }
1802 }
1803
1804
1805
1806 /**
1807  * \return pointer to the current GL context for this thread.
1808  *
1809  * Calls _glapi_get_context(). This isn't the fastest way to get the current
1810  * context.  If you need speed, see the #GET_CURRENT_CONTEXT macro in
1811  * context.h.
1812  */
1813 struct gl_context *
1814 _mesa_get_current_context( void )
1815 {
1816    return (struct gl_context *) _glapi_get_context();
1817 }
1818
1819
1820 /**
1821  * Get context's current API dispatch table.
1822  *
1823  * It'll either be the immediate-mode execute dispatcher, the display list
1824  * compile dispatcher, or the thread marshalling dispatcher.
1825  *
1826  * \param ctx GL context.
1827  *
1828  * \return pointer to dispatch_table.
1829  *
1830  * Simply returns __struct gl_contextRec::CurrentClientDispatch.
1831  */
1832 struct _glapi_table *
1833 _mesa_get_dispatch(struct gl_context *ctx)
1834 {
1835    return ctx->CurrentClientDispatch;
1836 }
1837
1838 /*@}*/
1839
1840
1841 /**********************************************************************/
1842 /** \name Miscellaneous functions                                     */
1843 /**********************************************************************/
1844 /*@{*/
1845 /**
1846  * Flush commands.
1847  */
1848 void
1849 _mesa_flush(struct gl_context *ctx)
1850 {
1851    FLUSH_VERTICES( ctx, 0 );
1852    FLUSH_CURRENT( ctx, 0 );
1853    if (ctx->Driver.Flush) {
1854       ctx->Driver.Flush(ctx);
1855    }
1856 }
1857
1858
1859
1860 /**
1861  * Flush commands and wait for completion.
1862  *
1863  * Calls the #ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH macro and the
1864  * dd_function_table::Finish driver callback, if not NULL.
1865  */
1866 void GLAPIENTRY
1867 _mesa_Finish(void)
1868 {
1869    GET_CURRENT_CONTEXT(ctx);
1870    ASSERT_OUTSIDE_BEGIN_END(ctx);
1871
1872    FLUSH_VERTICES(ctx, 0);
1873    FLUSH_CURRENT(ctx, 0);
1874
1875    if (ctx->Driver.Finish) {
1876       ctx->Driver.Finish(ctx);
1877    }
1878 }
1879
1880
1881 /**
1882  * Execute glFlush().
1883  *
1884  * Calls the #ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH macro and the
1885  * dd_function_table::Flush driver callback, if not NULL.
1886  */
1887 void GLAPIENTRY
1888 _mesa_Flush(void)
1889 {
1890    GET_CURRENT_CONTEXT(ctx);
1891    ASSERT_OUTSIDE_BEGIN_END(ctx);
1892    _mesa_flush(ctx);
1893 }
1894
1895
1896 /*@}*/