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    /* Shading language version */
 642    _mesa_override_glsl_version(consts);
 643
 644 #ifdef DEBUG
 645    consts->GenerateTemporaryNames = true;
 646 #else
 647    consts->GenerateTemporaryNames = false;
 648 #endif
 649
 650    /* GL_ARB_framebuffer_object */
 651    consts->MaxSamples = 0;
 652
 653    /* GLSL default if NativeIntegers == FALSE */
 654    consts->UniformBooleanTrue = FLOAT_AS_UNION(1.0f).u;
 655
 656    /* GL_ARB_sync */
 657    consts->MaxServerWaitTimeout = 0x7fffffff7fffffffULL;
 658
 659    /* GL_EXT_provoking_vertex */
 660    consts->QuadsFollowProvokingVertexConvention = GL_TRUE;
 661
 662    /** GL_ARB_viewport_array */
 663    consts->LayerAndVPIndexProvokingVertex = GL_UNDEFINED_VERTEX;
 664
 665    /* GL_EXT_transform_feedback */
 666    consts->MaxTransformFeedbackBuffers = MAX_FEEDBACK_BUFFERS;
 667    consts->MaxTransformFeedbackSeparateComponents = 4 * MAX_FEEDBACK_ATTRIBS;
 668    consts->MaxTransformFeedbackInterleavedComponents = 4 * MAX_FEEDBACK_ATTRIBS;
 669    consts->MaxVertexStreams = 1;
 670
 671    /* GL 3.2  */
 672    consts->ProfileMask = api == API_OPENGL_CORE
 673                           ? GL_CONTEXT_CORE_PROFILE_BIT
 674                           : GL_CONTEXT_COMPATIBILITY_PROFILE_BIT;
 675
 676    /* GL 4.4 */
 677    consts->MaxVertexAttribStride = 2048;
 678
 679    /** GL_EXT_gpu_shader4 */
 680    consts->MinProgramTexelOffset = -8;
 681    consts->MaxProgramTexelOffset = 7;
 682
 683    /* GL_ARB_texture_gather */
 684    consts->MinProgramTextureGatherOffset = -8;
 685    consts->MaxProgramTextureGatherOffset = 7;
 686
 687    /* GL_ARB_robustness */
 688    consts->ResetStrategy = GL_NO_RESET_NOTIFICATION_ARB;
 689
 690    /* GL_KHR_robustness */
 691    consts->RobustAccess = GL_FALSE;
 692
 693    /* ES 3.0 or ARB_ES3_compatibility */
 694    consts->MaxElementIndex = 0xffffffffu;
 695
 696    /* GL_ARB_texture_multisample */
 697    consts->MaxColorTextureSamples = 1;
 698    consts->MaxDepthTextureSamples = 1;
 699    consts->MaxIntegerSamples = 1;
 700
 701    /* GL_ARB_shader_atomic_counters */
 702    consts->MaxAtomicBufferBindings = MAX_COMBINED_ATOMIC_BUFFERS;
 703    consts->MaxAtomicBufferSize = MAX_ATOMIC_COUNTERS * ATOMIC_COUNTER_SIZE;
 704    consts->MaxCombinedAtomicBuffers = MAX_COMBINED_ATOMIC_BUFFERS;
 705    consts->MaxCombinedAtomicCounters = MAX_ATOMIC_COUNTERS;
 706
 707    /* GL_ARB_vertex_attrib_binding */
 708    consts->MaxVertexAttribRelativeOffset = 2047;
 709    consts->MaxVertexAttribBindings = MAX_VERTEX_GENERIC_ATTRIBS;
 710
 711    /* GL_ARB_compute_shader */
 712    consts->MaxComputeWorkGroupCount[0] = 65535;
 713    consts->MaxComputeWorkGroupCount[1] = 65535;
 714    consts->MaxComputeWorkGroupCount[2] = 65535;
 715    consts->MaxComputeWorkGroupSize[0] = 1024;
 716    consts->MaxComputeWorkGroupSize[1] = 1024;
 717    consts->MaxComputeWorkGroupSize[2] = 64;
 718    /* Enables compute support for GLES 3.1 if >= 128 */
 719    consts->MaxComputeWorkGroupInvocations = 0;
 720
 721    /** GL_ARB_gpu_shader5 */
 722    consts->MinFragmentInterpolationOffset = MIN_FRAGMENT_INTERPOLATION_OFFSET;
 723    consts->MaxFragmentInterpolationOffset = MAX_FRAGMENT_INTERPOLATION_OFFSET;
 724
 725    /** GL_KHR_context_flush_control */
 726    consts->ContextReleaseBehavior = GL_CONTEXT_RELEASE_BEHAVIOR_FLUSH;
 727
 728    /** GL_ARB_tessellation_shader */
 729    consts->MaxTessGenLevel = MAX_TESS_GEN_LEVEL;
 730    consts->MaxPatchVertices = MAX_PATCH_VERTICES;
 731    consts->Program[MESA_SHADER_TESS_CTRL].MaxTextureImageUnits = MAX_TEXTURE_IMAGE_UNITS;
 732    consts->Program[MESA_SHADER_TESS_EVAL].MaxTextureImageUnits = MAX_TEXTURE_IMAGE_UNITS;
 733    consts->MaxTessPatchComponents = MAX_TESS_PATCH_COMPONENTS;
 734    consts->MaxTessControlTotalOutputComponents = MAX_TESS_CONTROL_TOTAL_OUTPUT_COMPONENTS;
 735    consts->PrimitiveRestartForPatches = false;
 736
 737    /** GL_ARB_compute_variable_group_size */
 738    consts->MaxComputeVariableGroupSize[0] = 512;
 739    consts->MaxComputeVariableGroupSize[1] = 512;
 740    consts->MaxComputeVariableGroupSize[2] = 64;
 741    consts->MaxComputeVariableGroupInvocations = 512;
 742
 743    /** GL_NV_conservative_raster */
 744    consts->MaxSubpixelPrecisionBiasBits = 0;
 745
 746    /** GL_NV_conservative_raster_dilate */
 747    consts->ConservativeRasterDilateRange[0] = 0.0;
 748    consts->ConservativeRasterDilateRange[0] = 0.0;
 749    consts->ConservativeRasterDilateGranularity = 0.0;
 750 }
 751
 752
 753 /**
 754  * Do some sanity checks on the limits/constants for the given context.
 755  * Only called the first time a context is bound.
 756  */
 757 static void
 758 check_context_limits(struct gl_context *ctx)
 759 {
 760    (void) ctx;
 761
 762    /* check that we don't exceed the size of various bitfields */
 763    assert(VARYING_SLOT_MAX <=
 764           (8 * sizeof(ctx->VertexProgram._Current->info.outputs_written)));
 765    assert(VARYING_SLOT_MAX <=
 766           (8 * sizeof(ctx->FragmentProgram._Current->info.inputs_read)));
 767
 768    /* shader-related checks */
 769    assert(ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxLocalParams <= MAX_PROGRAM_LOCAL_PARAMS);
 770    assert(ctx->Const.Program[MESA_SHADER_VERTEX].MaxLocalParams <= MAX_PROGRAM_LOCAL_PARAMS);
 771
 772    /* Texture unit checks */
 773    assert(ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits > 0);
 774    assert(ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits <= MAX_TEXTURE_IMAGE_UNITS);
 775    assert(ctx->Const.MaxTextureCoordUnits > 0);
 776    assert(ctx->Const.MaxTextureCoordUnits <= MAX_TEXTURE_COORD_UNITS);
 777    assert(ctx->Const.MaxTextureUnits > 0);
 778    assert(ctx->Const.MaxTextureUnits <= MAX_TEXTURE_IMAGE_UNITS);
 779    assert(ctx->Const.MaxTextureUnits <= MAX_TEXTURE_COORD_UNITS);
 780    assert(ctx->Const.MaxTextureUnits == MIN2(ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits,
 781                                              ctx->Const.MaxTextureCoordUnits));
 782    assert(ctx->Const.MaxCombinedTextureImageUnits > 0);
 783    assert(ctx->Const.MaxCombinedTextureImageUnits <= MAX_COMBINED_TEXTURE_IMAGE_UNITS);
 784    assert(ctx->Const.MaxTextureCoordUnits <= MAX_COMBINED_TEXTURE_IMAGE_UNITS);
 785    /* number of coord units cannot be greater than number of image units */
 786    assert(ctx->Const.MaxTextureCoordUnits <= ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits);
 787
 788
 789    /* Texture size checks */
 790    assert(ctx->Const.MaxTextureLevels <= MAX_TEXTURE_LEVELS);
 791    assert(ctx->Const.Max3DTextureLevels <= MAX_3D_TEXTURE_LEVELS);
 792    assert(ctx->Const.MaxCubeTextureLevels <= MAX_CUBE_TEXTURE_LEVELS);
 793    assert(ctx->Const.MaxTextureRectSize <= MAX_TEXTURE_RECT_SIZE);
 794
 795    /* Texture level checks */
 796    assert(MAX_TEXTURE_LEVELS >= MAX_3D_TEXTURE_LEVELS);
 797    assert(MAX_TEXTURE_LEVELS >= MAX_CUBE_TEXTURE_LEVELS);
 798
 799    /* Max texture size should be <= max viewport size (render to texture) */
 800    assert((1U << (ctx->Const.MaxTextureLevels - 1))
 801           <= ctx->Const.MaxViewportWidth);
 802    assert((1U << (ctx->Const.MaxTextureLevels - 1))
 803           <= ctx->Const.MaxViewportHeight);
 804
 805    assert(ctx->Const.MaxDrawBuffers <= MAX_DRAW_BUFFERS);
 806
 807    /* if this fails, add more enum values to gl_buffer_index */
 808    assert(BUFFER_COLOR0 + MAX_DRAW_BUFFERS <= BUFFER_COUNT);
 809
 810    /* XXX probably add more tests */
 811 }
 812
 813
 814 /**
 815  * Initialize the attribute groups in a GL context.
 816  *
 817  * \param ctx GL context.
 818  *
 819  * Initializes all the attributes, calling the respective <tt>init*</tt>
 820  * functions for the more complex data structures.
 821  */
 822 static GLboolean
 823 init_attrib_groups(struct gl_context *ctx)
 824 {
 825    assert(ctx);
 826
 827    /* Constants */
 828    _mesa_init_constants(&ctx->Const, ctx->API);
 829
 830    /* Extensions */
 831    _mesa_init_extensions(&ctx->Extensions);
 832
 833    /* Attribute Groups */
 834    _mesa_init_accum( ctx );
 835    _mesa_init_attrib( ctx );
 836    _mesa_init_bbox( ctx );
 837    _mesa_init_buffer_objects( ctx );
 838    _mesa_init_color( ctx );
 839    _mesa_init_conservative_raster( ctx );
 840    _mesa_init_current( ctx );
 841    _mesa_init_depth( ctx );
 842    _mesa_init_debug( ctx );
 843    _mesa_init_debug_output( ctx );
 844    _mesa_init_display_list( ctx );
 845    _mesa_init_eval( ctx );
 846    _mesa_init_fbobjects( ctx );
 847    _mesa_init_feedback( ctx );
 848    _mesa_init_fog( ctx );
 849    _mesa_init_hint( ctx );
 850    _mesa_init_image_units( ctx );
 851    _mesa_init_line( ctx );
 852    _mesa_init_lighting( ctx );
 853    _mesa_init_matrix( ctx );
 854    _mesa_init_multisample( ctx );
 855    _mesa_init_performance_monitors( ctx );
 856    _mesa_init_performance_queries( ctx );
 857    _mesa_init_pipeline( ctx );
 858    _mesa_init_pixel( ctx );
 859    _mesa_init_pixelstore( ctx );
 860    _mesa_init_point( ctx );
 861    _mesa_init_polygon( ctx );
 862    _mesa_init_program( ctx );
 863    _mesa_init_queryobj( ctx );
 864    _mesa_init_sync( ctx );
 865    _mesa_init_rastpos( ctx );
 866    _mesa_init_scissor( ctx );
 867    _mesa_init_shader_state( ctx );
 868    _mesa_init_stencil( ctx );
 869    _mesa_init_transform( ctx );
 870    _mesa_init_transform_feedback( ctx );
 871    _mesa_init_varray( ctx );
 872    _mesa_init_viewport( ctx );
 873    _mesa_init_resident_handles( ctx );
 874
 875    if (!_mesa_init_texture( ctx ))
 876       return GL_FALSE;
 877
 878    /* Miscellaneous */
 879    ctx->TileRasterOrderIncreasingX = GL_TRUE;
 880    ctx->TileRasterOrderIncreasingY = GL_TRUE;
 881    ctx->NewState = _NEW_ALL;
 882    ctx->NewDriverState = ~0;
 883    ctx->ErrorValue = GL_NO_ERROR;
 884    ctx->ShareGroupReset = false;
 885    ctx->varying_vp_inputs = VERT_BIT_ALL;
 886
 887    return GL_TRUE;
 888 }
 889
 890
 891 /**
 892  * Update default objects in a GL context with respect to shared state.
 893  *
 894  * \param ctx GL context.
 895  *
 896  * Removes references to old default objects, (texture objects, program
 897  * objects, etc.) and changes to reference those from the current shared
 898  * state.
 899  */
 900 static GLboolean
 901 update_default_objects(struct gl_context *ctx)
 902 {
 903    assert(ctx);
 904
 905    _mesa_update_default_objects_program(ctx);
 906    _mesa_update_default_objects_texture(ctx);
 907    _mesa_update_default_objects_buffer_objects(ctx);
 908
 909    return GL_TRUE;
 910 }
 911
 912
 913 /* XXX this is temporary and should be removed at some point in the
 914  * future when there's a reasonable expectation that the libGL library
 915  * contains the _glapi_new_nop_table() and _glapi_set_nop_handler()
 916  * functions which were added in Mesa 10.6.
 917  */
 918 #if !defined(_WIN32)
 919 /* Avoid libGL / driver ABI break */
 920 #define USE_GLAPI_NOP_FEATURES 0
 921 #else
 922 #define USE_GLAPI_NOP_FEATURES 1
 923 #endif
 924
 925
 926 /**
 927  * This function is called by the glapi no-op functions.  For each OpenGL
 928  * function/entrypoint there's a simple no-op function.  These "no-op"
 929  * functions call this function.
 930  *
 931  * If there's a current OpenGL context for the calling thread, we record a
 932  * GL_INVALID_OPERATION error.  This can happen either because the app's
 933  * calling an unsupported extension function, or calling an illegal function
 934  * (such as glClear between glBegin/glEnd).
 935  *
 936  * If there's no current OpenGL context for the calling thread, we can
 937  * print a message to stderr.
 938  *
 939  * \param name  the name of the OpenGL function
 940  */
 941 #if USE_GLAPI_NOP_FEATURES
 942 static void
 943 nop_handler(const char *name)
 944 {
 945    GET_CURRENT_CONTEXT(ctx);
 946    if (ctx) {
 947       _mesa_error(ctx, GL_INVALID_OPERATION, "%s(invalid call)", name);
 948    }
 949 #if defined(DEBUG)
 950    else if (getenv("MESA_DEBUG") || getenv("LIBGL_DEBUG")) {
 951       fprintf(stderr,
 952               "GL User Error: gl%s called without a rendering context\n",
 953               name);
 954       fflush(stderr);
 955    }
 956 #endif
 957 }
 958 #endif
 959
 960
 961 /**
 962  * Special no-op glFlush, see below.
 963  */
 964 #if defined(_WIN32)
 965 static void GLAPIENTRY
 966 nop_glFlush(void)
 967 {
 968    /* don't record an error like we do in nop_handler() */
 969 }
 970 #endif
 971
 972
 973 #if !USE_GLAPI_NOP_FEATURES
 974 static int
 975 generic_nop(void)
 976 {
 977    GET_CURRENT_CONTEXT(ctx);
 978    _mesa_error(ctx, GL_INVALID_OPERATION,
 979                "unsupported function called "
 980                "(unsupported extension or deprecated function?)");
 981    return 0;
 982 }
 983 #endif
 984
 985
 986 /**
 987  * Create a new API dispatch table in which all entries point to the
 988  * generic_nop() function.  This will not work on Windows because of
 989  * the __stdcall convention which requires the callee to clean up the
 990  * call stack.  That's impossible with one generic no-op function.
 991  */
 992 struct _glapi_table *
 993 _mesa_new_nop_table(unsigned numEntries)
 994 {
 995    struct _glapi_table *table;
 996
 997 #if !USE_GLAPI_NOP_FEATURES
 998    table = malloc(numEntries * sizeof(_glapi_proc));
 999    if (table) {
1000       _glapi_proc *entry = (_glapi_proc *) table;
1001       unsigned i;
1002       for (i = 0; i < numEntries; i++) {
1003          entry[i] = (_glapi_proc) generic_nop;
1004       }
1005    }
1006 #else
1007    table = _glapi_new_nop_table(numEntries);
1008 #endif
1009    return table;
1010 }
1011
1012
1013 /**
1014  * Allocate and initialize a new dispatch table.  The table will be
1015  * populated with pointers to "no-op" functions.  In turn, the no-op
1016  * functions will call nop_handler() above.
1017  */
1018 struct _glapi_table *
1019 _mesa_alloc_dispatch_table(void)
1020 {
1021    /* Find the larger of Mesa's dispatch table and libGL's dispatch table.
1022     * In practice, this'll be the same for stand-alone Mesa.  But for DRI
1023     * Mesa we do this to accommodate different versions of libGL and various
1024     * DRI drivers.
1025     */
1026    int numEntries = MAX2(_glapi_get_dispatch_table_size(), _gloffset_COUNT);
1027
1028    struct _glapi_table *table = _mesa_new_nop_table(numEntries);
1029
1030 #if defined(_WIN32)
1031    if (table) {
1032       /* This is a special case for Windows in the event that
1033        * wglGetProcAddress is called between glBegin/End().
1034        *
1035        * The MS opengl32.dll library apparently calls glFlush from
1036        * wglGetProcAddress().  If we're inside glBegin/End(), glFlush
1037        * will dispatch to _mesa_generic_nop() and we'll generate a
1038        * GL_INVALID_OPERATION error.
1039        *
1040        * The specific case which hits this is piglit's primitive-restart
1041        * test which calls glPrimitiveRestartNV() inside glBegin/End.  The
1042        * first time we call glPrimitiveRestartNV() Piglit's API dispatch
1043        * code will try to resolve the function by calling wglGetProcAddress.
1044        * This raises GL_INVALID_OPERATION and an assert(glGetError()==0)
1045        * will fail causing the test to fail.  By suppressing the error, the
1046        * assertion passes and the test continues.
1047        */
1048       SET_Flush(table, nop_glFlush);
1049    }
1050 #endif
1051
1052 #if USE_GLAPI_NOP_FEATURES
1053    _glapi_set_nop_handler(nop_handler);
1054 #endif
1055
1056    return table;
1057 }
1058
1059 /**
1060  * Creates a minimal dispatch table for use within glBegin()/glEnd().
1061  *
1062  * This ensures that we generate GL_INVALID_OPERATION errors from most
1063  * functions, since the set of functions that are valid within Begin/End is
1064  * very small.
1065  *
1066  * From the GL 1.0 specification section 2.6.3, "GL Commands within
1067  * Begin/End"
1068  *
1069  *     "The only GL commands that are allowed within any Begin/End pairs are
1070  *      the commands for specifying vertex coordinates, vertex color, normal
1071  *      coordinates, and texture coordinates (Vertex, Color, Index, Normal,
1072  *      TexCoord), EvalCoord and EvalPoint commands (see section 5.1),
1073  *      commands for specifying lighting material parameters (Material
1074  *      commands see section 2.12.2), display list invocation commands
1075  *      (CallList and CallLists see section 5.4), and the EdgeFlag
1076  *      command. Executing Begin after Begin has already been executed but
1077  *      before an End is issued generates the INVALID OPERATION error, as does
1078  *      executing End without a previous corresponding Begin. Executing any
1079  *      other GL command within Begin/End results in the error INVALID
1080  *      OPERATION."
1081  *
1082  * The table entries for specifying vertex attributes are set up by
1083  * install_vtxfmt() and _mesa_loopback_init_api_table(), and End() and dlists
1084  * are set by install_vtxfmt() as well.
1085  */
1086 static struct _glapi_table *
1087 create_beginend_table(const struct gl_context *ctx)
1088 {
1089    struct _glapi_table *table;
1090
1091    table = _mesa_alloc_dispatch_table();
1092    if (!table)
1093       return NULL;
1094
1095    /* Fill in functions which return a value, since they should return some
1096     * specific value even if they emit a GL_INVALID_OPERATION error from them
1097     * being called within glBegin()/glEnd().
1098     */
1099 #define COPY_DISPATCH(func) SET_##func(table, GET_##func(ctx->Exec))
1100
1101    COPY_DISPATCH(GenLists);
1102    COPY_DISPATCH(IsProgram);
1103    COPY_DISPATCH(IsVertexArray);
1104    COPY_DISPATCH(IsBuffer);
1105    COPY_DISPATCH(IsEnabled);
1106    COPY_DISPATCH(IsEnabledi);
1107    COPY_DISPATCH(IsRenderbuffer);
1108    COPY_DISPATCH(IsFramebuffer);
1109    COPY_DISPATCH(CheckFramebufferStatus);
1110    COPY_DISPATCH(RenderMode);
1111    COPY_DISPATCH(GetString);
1112    COPY_DISPATCH(GetStringi);
1113    COPY_DISPATCH(GetPointerv);
1114    COPY_DISPATCH(IsQuery);
1115    COPY_DISPATCH(IsSampler);
1116    COPY_DISPATCH(IsSync);
1117    COPY_DISPATCH(IsTexture);
1118    COPY_DISPATCH(IsTransformFeedback);
1119    COPY_DISPATCH(DeleteQueries);
1120    COPY_DISPATCH(AreTexturesResident);
1121    COPY_DISPATCH(FenceSync);
1122    COPY_DISPATCH(ClientWaitSync);
1123    COPY_DISPATCH(MapBuffer);
1124    COPY_DISPATCH(UnmapBuffer);
1125    COPY_DISPATCH(MapBufferRange);
1126    COPY_DISPATCH(ObjectPurgeableAPPLE);
1127    COPY_DISPATCH(ObjectUnpurgeableAPPLE);
1128
1129    _mesa_loopback_init_api_table(ctx, table);
1130
1131    return table;
1132 }
1133
1134 void
1135 _mesa_initialize_dispatch_tables(struct gl_context *ctx)
1136 {
1137    /* Do the code-generated setup of the exec table in api_exec.c. */
1138    _mesa_initialize_exec_table(ctx);
1139
1140    if (ctx->Save)
1141       _mesa_initialize_save_table(ctx);
1142 }
1143
1144 /**
1145  * Initialize a struct gl_context struct (rendering context).
1146  *
1147  * This includes allocating all the other structs and arrays which hang off of
1148  * the context by pointers.
1149  * Note that the driver needs to pass in its dd_function_table here since
1150  * we need to at least call driverFunctions->NewTextureObject to create the
1151  * default texture objects.
1152  *
1153  * Called by _mesa_create_context().
1154  *
1155  * Performs the imports and exports callback tables initialization, and
1156  * miscellaneous one-time initializations. If no shared context is supplied one
1157  * is allocated, and increase its reference count.  Setups the GL API dispatch
1158  * tables.  Initialize the TNL module. Sets the maximum Z buffer depth.
1159  * Finally queries the \c MESA_DEBUG and \c MESA_VERBOSE environment variables
1160  * for debug flags.
1161  *
1162  * \param ctx the context to initialize
1163  * \param api the GL API type to create the context for
1164  * \param visual describes the visual attributes for this context or NULL to
1165  *               create a configless context
1166  * \param share_list points to context to share textures, display lists,
1167  *        etc with, or NULL
1168  * \param driverFunctions table of device driver functions for this context
1169  *        to use
1170  */
1171 GLboolean
1172 _mesa_initialize_context(struct gl_context *ctx,
1173                          gl_api api,
1174                          const struct gl_config *visual,
1175                          struct gl_context *share_list,
1176                          const struct dd_function_table *driverFunctions)
1177 {
1178    struct gl_shared_state *shared;
1179    int i;
1180
1181    assert(driverFunctions->NewTextureObject);
1182    assert(driverFunctions->FreeTextureImageBuffer);
1183
1184    ctx->API = api;
1185    ctx->DrawBuffer = NULL;
1186    ctx->ReadBuffer = NULL;
1187    ctx->WinSysDrawBuffer = NULL;
1188    ctx->WinSysReadBuffer = NULL;
1189
1190    if (visual) {
1191       ctx->Visual = *visual;
1192       ctx->HasConfig = GL_TRUE;
1193    }
1194    else {
1195       memset(&ctx->Visual, 0, sizeof ctx->Visual);
1196       ctx->HasConfig = GL_FALSE;
1197    }
1198
1199    _mesa_override_gl_version(ctx);
1200
1201    /* misc one-time initializations */
1202    one_time_init(ctx);
1203
1204    /* Plug in driver functions and context pointer here.
1205     * This is important because when we call alloc_shared_state() below
1206     * we'll call ctx->Driver.NewTextureObject() to create the default
1207     * textures.
1208     */
1209    ctx->Driver = *driverFunctions;
1210
1211    if (share_list) {
1212       /* share state with another context */
1213       shared = share_list->Shared;
1214    }
1215    else {
1216       /* allocate new, unshared state */
1217       shared = _mesa_alloc_shared_state(ctx);
1218       if (!shared)
1219          return GL_FALSE;
1220    }
1221
1222    _mesa_reference_shared_state(ctx, &ctx->Shared, shared);
1223
1224    if (!init_attrib_groups( ctx ))
1225       goto fail;
1226
1227    /* KHR_no_error is likely to crash, overflow memory, etc if an application
1228     * has errors so don't enable it for setuid processes.
1229     */
1230    if (env_var_as_boolean("MESA_NO_ERROR", false)) {
1231 #if !defined(_WIN32)
1232       if (geteuid() == getuid())
1233 #endif
1234          ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_NO_ERROR_BIT_KHR;
1235    }
1236
1237    /* setup the API dispatch tables with all nop functions */
1238    ctx->OutsideBeginEnd = _mesa_alloc_dispatch_table();
1239    if (!ctx->OutsideBeginEnd)
1240       goto fail;
1241    ctx->Exec = ctx->OutsideBeginEnd;
1242    ctx->CurrentClientDispatch = ctx->CurrentServerDispatch = ctx->OutsideBeginEnd;
1243
1244    ctx->FragmentProgram._MaintainTexEnvProgram
1245       = (getenv("MESA_TEX_PROG") != NULL);
1246
1247    ctx->VertexProgram._MaintainTnlProgram
1248       = (getenv("MESA_TNL_PROG") != NULL);
1249    if (ctx->VertexProgram._MaintainTnlProgram) {
1250       /* this is required... */
1251       ctx->FragmentProgram._MaintainTexEnvProgram = GL_TRUE;
1252    }
1253
1254    /* Mesa core handles all the formats that mesa core knows about.
1255     * Drivers will want to override this list with just the formats
1256     * they can handle, and confirm that appropriate fallbacks exist in
1257     * _mesa_choose_tex_format().
1258     */
1259    memset(&ctx->TextureFormatSupported, GL_TRUE,
1260           sizeof(ctx->TextureFormatSupported));
1261
1262    switch (ctx->API) {
1263    case API_OPENGL_COMPAT:
1264       ctx->BeginEnd = create_beginend_table(ctx);
1265       ctx->Save = _mesa_alloc_dispatch_table();
1266       if (!ctx->BeginEnd || !ctx->Save)
1267          goto fail;
1268
1269       /* fall-through */
1270    case API_OPENGL_CORE:
1271       break;
1272    case API_OPENGLES:
1273       /**
1274        * GL_OES_texture_cube_map says
1275        * "Initially all texture generation modes are set to REFLECTION_MAP_OES"
1276        */
1277       for (i = 0; i < ARRAY_SIZE(ctx->Texture.FixedFuncUnit); i++) {
1278          struct gl_fixedfunc_texture_unit *texUnit =
1279             &ctx->Texture.FixedFuncUnit[i];
1280
1281          texUnit->GenS.Mode = GL_REFLECTION_MAP_NV;
1282          texUnit->GenT.Mode = GL_REFLECTION_MAP_NV;
1283          texUnit->GenR.Mode = GL_REFLECTION_MAP_NV;
1284          texUnit->GenS._ModeBit = TEXGEN_REFLECTION_MAP_NV;
1285          texUnit->GenT._ModeBit = TEXGEN_REFLECTION_MAP_NV;
1286          texUnit->GenR._ModeBit = TEXGEN_REFLECTION_MAP_NV;
1287       }
1288       break;
1289    case API_OPENGLES2:
1290       ctx->FragmentProgram._MaintainTexEnvProgram = GL_TRUE;
1291       ctx->VertexProgram._MaintainTnlProgram = GL_TRUE;
1292       break;
1293    }
1294
1295    ctx->FirstTimeCurrent = GL_TRUE;
1296
1297    return GL_TRUE;
1298
1299 fail:
1300    _mesa_reference_shared_state(ctx, &ctx->Shared, NULL);
1301    free(ctx->BeginEnd);
1302    free(ctx->OutsideBeginEnd);
1303    free(ctx->Save);
1304    return GL_FALSE;
1305 }
1306
1307
1308 /**
1309  * Free the data associated with the given context.
1310  *
1311  * But doesn't free the struct gl_context struct itself.
1312  *
1313  * \sa _mesa_initialize_context() and init_attrib_groups().
1314  */
1315 void
1316 _mesa_free_context_data( struct gl_context *ctx )
1317 {
1318    if (!_mesa_get_current_context()){
1319       /* No current context, but we may need one in order to delete
1320        * texture objs, etc.  So temporarily bind the context now.
1321        */
1322       _mesa_make_current(ctx, NULL, NULL);
1323    }
1324
1325    /* unreference WinSysDraw/Read buffers */
1326    _mesa_reference_framebuffer(&ctx->WinSysDrawBuffer, NULL);
1327    _mesa_reference_framebuffer(&ctx->WinSysReadBuffer, NULL);
1328    _mesa_reference_framebuffer(&ctx->DrawBuffer, NULL);
1329    _mesa_reference_framebuffer(&ctx->ReadBuffer, NULL);
1330
1331    _mesa_reference_program(ctx, &ctx->VertexProgram.Current, NULL);
1332    _mesa_reference_program(ctx, &ctx->VertexProgram._Current, NULL);
1333    _mesa_reference_program(ctx, &ctx->VertexProgram._TnlProgram, NULL);
1334
1335    _mesa_reference_program(ctx, &ctx->TessCtrlProgram._Current, NULL);
1336    _mesa_reference_program(ctx, &ctx->TessEvalProgram._Current, NULL);
1337    _mesa_reference_program(ctx, &ctx->GeometryProgram._Current, NULL);
1338
1339    _mesa_reference_program(ctx, &ctx->FragmentProgram.Current, NULL);
1340    _mesa_reference_program(ctx, &ctx->FragmentProgram._Current, NULL);
1341    _mesa_reference_program(ctx, &ctx->FragmentProgram._TexEnvProgram, NULL);
1342
1343    _mesa_reference_program(ctx, &ctx->ComputeProgram._Current, NULL);
1344
1345    _mesa_reference_vao(ctx, &ctx->Array.VAO, NULL);
1346    _mesa_reference_vao(ctx, &ctx->Array.DefaultVAO, NULL);
1347    _mesa_reference_vao(ctx, &ctx->Array._EmptyVAO, NULL);
1348    _mesa_reference_vao(ctx, &ctx->Array._DrawVAO, NULL);
1349
1350    _mesa_free_attrib_data(ctx);
1351    _mesa_free_buffer_objects(ctx);
1352    _mesa_free_eval_data( ctx );
1353    _mesa_free_texture_data( ctx );
1354    _mesa_free_matrix_data( ctx );
1355    _mesa_free_pipeline_data(ctx);
1356    _mesa_free_program_data(ctx);
1357    _mesa_free_shader_state(ctx);
1358    _mesa_free_queryobj_data(ctx);
1359    _mesa_free_sync_data(ctx);
1360    _mesa_free_varray_data(ctx);
1361    _mesa_free_transform_feedback(ctx);
1362    _mesa_free_performance_monitors(ctx);
1363    _mesa_free_performance_queries(ctx);
1364    _mesa_free_resident_handles(ctx);
1365
1366    _mesa_reference_buffer_object(ctx, &ctx->Pack.BufferObj, NULL);
1367    _mesa_reference_buffer_object(ctx, &ctx->Unpack.BufferObj, NULL);
1368    _mesa_reference_buffer_object(ctx, &ctx->DefaultPacking.BufferObj, NULL);
1369    _mesa_reference_buffer_object(ctx, &ctx->Array.ArrayBufferObj, NULL);
1370
1371    /* free dispatch tables */
1372    free(ctx->BeginEnd);
1373    free(ctx->OutsideBeginEnd);
1374    free(ctx->Save);
1375    free(ctx->ContextLost);
1376    free(ctx->MarshalExec);
1377
1378    /* Shared context state (display lists, textures, etc) */
1379    _mesa_reference_shared_state(ctx, &ctx->Shared, NULL);
1380
1381    /* needs to be after freeing shared state */
1382    _mesa_free_display_list_data(ctx);
1383
1384    _mesa_free_errors_data(ctx);
1385
1386    free((void *)ctx->Extensions.String);
1387
1388    free(ctx->VersionString);
1389
1390    /* unbind the context if it's currently bound */
1391    if (ctx == _mesa_get_current_context()) {
1392       _mesa_make_current(NULL, NULL, NULL);
1393    }
1394 }
1395
1396
1397 /**
1398  * Destroy a struct gl_context structure.
1399  *
1400  * \param ctx GL context.
1401  *
1402  * Calls _mesa_free_context_data() and frees the gl_context object itself.
1403  */
1404 void
1405 _mesa_destroy_context( struct gl_context *ctx )
1406 {
1407    if (ctx) {
1408       _mesa_free_context_data(ctx);
1409       free( (void *) ctx );
1410    }
1411 }
1412
1413
1414 /**
1415  * Copy attribute groups from one context to another.
1416  *
1417  * \param src source context
1418  * \param dst destination context
1419  * \param mask bitwise OR of GL_*_BIT flags
1420  *
1421  * According to the bits specified in \p mask, copies the corresponding
1422  * attributes from \p src into \p dst.  For many of the attributes a simple \c
1423  * memcpy is not enough due to the existence of internal pointers in their data
1424  * structures.
1425  */
1426 void
1427 _mesa_copy_context( const struct gl_context *src, struct gl_context *dst,
1428                     GLuint mask )
1429 {
1430    if (mask & GL_ACCUM_BUFFER_BIT) {
1431       /* OK to memcpy */
1432       dst->Accum = src->Accum;
1433    }
1434    if (mask & GL_COLOR_BUFFER_BIT) {
1435       /* OK to memcpy */
1436       dst->Color = src->Color;
1437    }
1438    if (mask & GL_CURRENT_BIT) {
1439       /* OK to memcpy */
1440       dst->Current = src->Current;
1441    }
1442    if (mask & GL_DEPTH_BUFFER_BIT) {
1443       /* OK to memcpy */
1444       dst->Depth = src->Depth;
1445    }
1446    if (mask & GL_ENABLE_BIT) {
1447       /* no op */
1448    }
1449    if (mask & GL_EVAL_BIT) {
1450       /* OK to memcpy */
1451       dst->Eval = src->Eval;
1452    }
1453    if (mask & GL_FOG_BIT) {
1454       /* OK to memcpy */
1455       dst->Fog = src->Fog;
1456    }
1457    if (mask & GL_HINT_BIT) {
1458       /* OK to memcpy */
1459       dst->Hint = src->Hint;
1460    }
1461    if (mask & GL_LIGHTING_BIT) {
1462       /* OK to memcpy */
1463       dst->Light = src->Light;
1464    }
1465    if (mask & GL_LINE_BIT) {
1466       /* OK to memcpy */
1467       dst->Line = src->Line;
1468    }
1469    if (mask & GL_LIST_BIT) {
1470       /* OK to memcpy */
1471       dst->List = src->List;
1472    }
1473    if (mask & GL_PIXEL_MODE_BIT) {
1474       /* OK to memcpy */
1475       dst->Pixel = src->Pixel;
1476    }
1477    if (mask & GL_POINT_BIT) {
1478       /* OK to memcpy */
1479       dst->Point = src->Point;
1480    }
1481    if (mask & GL_POLYGON_BIT) {
1482       /* OK to memcpy */
1483       dst->Polygon = src->Polygon;
1484    }
1485    if (mask & GL_POLYGON_STIPPLE_BIT) {
1486       /* Use loop instead of memcpy due to problem with Portland Group's
1487        * C compiler.  Reported by John Stone.
1488        */
1489       GLuint i;
1490       for (i = 0; i < 32; i++) {
1491          dst->PolygonStipple[i] = src->PolygonStipple[i];
1492       }
1493    }
1494    if (mask & GL_SCISSOR_BIT) {
1495       /* OK to memcpy */
1496       dst->Scissor = src->Scissor;
1497    }
1498    if (mask & GL_STENCIL_BUFFER_BIT) {
1499       /* OK to memcpy */
1500       dst->Stencil = src->Stencil;
1501    }
1502    if (mask & GL_TEXTURE_BIT) {
1503       /* Cannot memcpy because of pointers */
1504       _mesa_copy_texture_state(src, dst);
1505    }
1506    if (mask & GL_TRANSFORM_BIT) {
1507       /* OK to memcpy */
1508       dst->Transform = src->Transform;
1509    }
1510    if (mask & GL_VIEWPORT_BIT) {
1511       unsigned i;
1512       for (i = 0; i < src->Const.MaxViewports; i++) {
1513          /* OK to memcpy */
1514          dst->ViewportArray[i] = src->ViewportArray[i];
1515       }
1516    }
1517
1518    /* XXX FIXME:  Call callbacks?
1519     */
1520    dst->NewState = _NEW_ALL;
1521    dst->NewDriverState = ~0;
1522 }
1523
1524
1525 /**
1526  * Check if the given context can render into the given framebuffer
1527  * by checking visual attributes.
1528  *
1529  * \return GL_TRUE if compatible, GL_FALSE otherwise.
1530  */
1531 static GLboolean
1532 check_compatible(const struct gl_context *ctx,
1533                  const struct gl_framebuffer *buffer)
1534 {
1535    const struct gl_config *ctxvis = &ctx->Visual;
1536    const struct gl_config *bufvis = &buffer->Visual;
1537
1538    if (buffer == _mesa_get_incomplete_framebuffer())
1539       return GL_TRUE;
1540
1541 #define check_component(foo)           \
1542    if (ctxvis->foo && bufvis->foo &&   \
1543        ctxvis->foo != bufvis->foo)     \
1544       return GL_FALSE
1545
1546    check_component(redMask);
1547    check_component(greenMask);
1548    check_component(blueMask);
1549    check_component(depthBits);
1550    check_component(stencilBits);
1551
1552 #undef check_component
1553
1554    return GL_TRUE;
1555 }
1556
1557
1558 /**
1559  * Check if the viewport/scissor size has not yet been initialized.
1560  * Initialize the size if the given width and height are non-zero.
1561  */
1562 static void
1563 check_init_viewport(struct gl_context *ctx, GLuint width, GLuint height)
1564 {
1565    if (!ctx->ViewportInitialized && width > 0 && height > 0) {
1566       unsigned i;
1567
1568       /* Note: set flag here, before calling _mesa_set_viewport(), to prevent
1569        * potential infinite recursion.
1570        */
1571       ctx->ViewportInitialized = GL_TRUE;
1572
1573       /* Note: ctx->Const.MaxViewports may not have been set by the driver
1574        * yet, so just initialize all of them.
1575        */
1576       for (i = 0; i < MAX_VIEWPORTS; i++) {
1577          _mesa_set_viewport(ctx, i, 0, 0, width, height);
1578          _mesa_set_scissor(ctx, i, 0, 0, width, height);
1579       }
1580    }
1581 }
1582
1583
1584 static void
1585 handle_first_current(struct gl_context *ctx)
1586 {
1587    if (ctx->Version == 0 || !ctx->DrawBuffer) {
1588       /* probably in the process of tearing down the context */
1589       return;
1590    }
1591
1592    check_context_limits(ctx);
1593
1594    _mesa_update_vertex_processing_mode(ctx);
1595
1596    /* According to GL_MESA_configless_context the default value of
1597     * glDrawBuffers depends on the config of the first surface it is bound to.
1598     * For GLES it is always GL_BACK which has a magic interpretation.
1599     */
1600    if (!ctx->HasConfig && _mesa_is_desktop_gl(ctx)) {
1601       if (ctx->DrawBuffer != _mesa_get_incomplete_framebuffer()) {
1602          GLenum16 buffer;
1603
1604          if (ctx->DrawBuffer->Visual.doubleBufferMode)
1605             buffer = GL_BACK;
1606          else
1607             buffer = GL_FRONT;
1608
1609          _mesa_drawbuffers(ctx, ctx->DrawBuffer, 1, &buffer,
1610                            NULL /* destMask */);
1611       }
1612
1613       if (ctx->ReadBuffer != _mesa_get_incomplete_framebuffer()) {
1614          gl_buffer_index bufferIndex;
1615          GLenum buffer;
1616
1617          if (ctx->ReadBuffer->Visual.doubleBufferMode) {
1618             buffer = GL_BACK;
1619             bufferIndex = BUFFER_BACK_LEFT;
1620          }
1621          else {
1622             buffer = GL_FRONT;
1623             bufferIndex = BUFFER_FRONT_LEFT;
1624          }
1625
1626          _mesa_readbuffer(ctx, ctx->ReadBuffer, buffer, bufferIndex);
1627       }
1628    }
1629
1630    /* Determine if generic vertex attribute 0 aliases the conventional
1631     * glVertex position.
1632     */
1633    {
1634       const bool is_forward_compatible_context =
1635          ctx->Const.ContextFlags & GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT;
1636
1637       /* In OpenGL 3.1 attribute 0 becomes non-magic, just like in OpenGL ES
1638        * 2.0.  Note that we cannot just check for API_OPENGL_COMPAT here because
1639        * that will erroneously allow this usage in a 3.0 forward-compatible
1640        * context too.
1641        */
1642       ctx->_AttribZeroAliasesVertex = (ctx->API == API_OPENGLES
1643                                        || (ctx->API == API_OPENGL_COMPAT
1644                                            && !is_forward_compatible_context));
1645    }
1646
1647    /* We can use this to help debug user's problems.  Tell them to set
1648     * the MESA_INFO env variable before running their app.  Then the
1649     * first time each context is made current we'll print some useful
1650     * information.
1651     */
1652    if (getenv("MESA_INFO")) {
1653       _mesa_print_info(ctx);
1654    }
1655 }
1656
1657 /**
1658  * Bind the given context to the given drawBuffer and readBuffer and
1659  * make it the current context for the calling thread.
1660  * We'll render into the drawBuffer and read pixels from the
1661  * readBuffer (i.e. glRead/CopyPixels, glCopyTexImage, etc).
1662  *
1663  * We check that the context's and framebuffer's visuals are compatible
1664  * and return immediately if they're not.
1665  *
1666  * \param newCtx  the new GL context. If NULL then there will be no current GL
1667  *                context.
1668  * \param drawBuffer  the drawing framebuffer
1669  * \param readBuffer  the reading framebuffer
1670  */
1671 GLboolean
1672 _mesa_make_current( struct gl_context *newCtx,
1673                     struct gl_framebuffer *drawBuffer,
1674                     struct gl_framebuffer *readBuffer )
1675 {
1676    GET_CURRENT_CONTEXT(curCtx);
1677
1678    if (MESA_VERBOSE & VERBOSE_API)
1679       _mesa_debug(newCtx, "_mesa_make_current()\n");
1680
1681    /* Check that the context's and framebuffer's visuals are compatible.
1682     */
1683    if (newCtx && drawBuffer && newCtx->WinSysDrawBuffer != drawBuffer) {
1684       if (!check_compatible(newCtx, drawBuffer)) {
1685          _mesa_warning(newCtx,
1686               "MakeCurrent: incompatible visuals for context and drawbuffer");
1687          return GL_FALSE;
1688       }
1689    }
1690    if (newCtx && readBuffer && newCtx->WinSysReadBuffer != readBuffer) {
1691       if (!check_compatible(newCtx, readBuffer)) {
1692          _mesa_warning(newCtx,
1693               "MakeCurrent: incompatible visuals for context and readbuffer");
1694          return GL_FALSE;
1695       }
1696    }
1697
1698    if (curCtx &&
1699        (curCtx->WinSysDrawBuffer || curCtx->WinSysReadBuffer) &&
1700        /* make sure this context is valid for flushing */
1701        curCtx != newCtx &&
1702        curCtx->Const.ContextReleaseBehavior ==
1703        GL_CONTEXT_RELEASE_BEHAVIOR_FLUSH) {
1704       _mesa_flush(curCtx);
1705    }
1706
1707    /* We used to call _glapi_check_multithread() here.  Now do it in drivers */
1708
1709    if (!newCtx) {
1710       _glapi_set_dispatch(NULL);  /* none current */
1711       /* We need old ctx to correctly release Draw/ReadBuffer
1712        * and avoid a surface leak in st_renderbuffer_delete.
1713        * Therefore, first drop buffers then set new ctx to NULL.
1714        */
1715       if (curCtx) {
1716          _mesa_reference_framebuffer(&curCtx->WinSysDrawBuffer, NULL);
1717          _mesa_reference_framebuffer(&curCtx->WinSysReadBuffer, NULL);
1718       }
1719       _glapi_set_context(NULL);
1720       assert(_mesa_get_current_context() == NULL);
1721    }
1722    else {
1723       _glapi_set_context((void *) newCtx);
1724       assert(_mesa_get_current_context() == newCtx);
1725       _glapi_set_dispatch(newCtx->CurrentClientDispatch);
1726
1727       if (drawBuffer && readBuffer) {
1728          assert(_mesa_is_winsys_fbo(drawBuffer));
1729          assert(_mesa_is_winsys_fbo(readBuffer));
1730          _mesa_reference_framebuffer(&newCtx->WinSysDrawBuffer, drawBuffer);
1731          _mesa_reference_framebuffer(&newCtx->WinSysReadBuffer, readBuffer);
1732
1733          /*
1734           * Only set the context's Draw/ReadBuffer fields if they're NULL
1735           * or not bound to a user-created FBO.
1736           */
1737          if (!newCtx->DrawBuffer || _mesa_is_winsys_fbo(newCtx->DrawBuffer)) {
1738             _mesa_reference_framebuffer(&newCtx->DrawBuffer, drawBuffer);
1739             /* Update the FBO's list of drawbuffers/renderbuffers.
1740              * For winsys FBOs this comes from the GL state (which may have
1741              * changed since the last time this FBO was bound).
1742              */
1743             _mesa_update_draw_buffers(newCtx);
1744          }
1745          if (!newCtx->ReadBuffer || _mesa_is_winsys_fbo(newCtx->ReadBuffer)) {
1746             _mesa_reference_framebuffer(&newCtx->ReadBuffer, readBuffer);
1747             /* In _mesa_initialize_window_framebuffer, for single-buffered
1748              * visuals, the ColorReadBuffer is set to be GL_FRONT, even with
1749              * GLES contexts. When calling read_buffer, we verify we are reading
1750              * from GL_BACK in is_legal_es3_readbuffer_enum.  But the default is
1751              * incorrect, and certain dEQP tests check this.  So fix it here.
1752              */
1753             if (_mesa_is_gles(newCtx) &&
1754                !newCtx->ReadBuffer->Visual.doubleBufferMode)
1755                if (newCtx->ReadBuffer->ColorReadBuffer == GL_FRONT)
1756                   newCtx->ReadBuffer->ColorReadBuffer = GL_BACK;
1757          }
1758
1759          /* XXX only set this flag if we're really changing the draw/read
1760           * framebuffer bindings.
1761           */
1762          newCtx->NewState |= _NEW_BUFFERS;
1763
1764          check_init_viewport(newCtx, drawBuffer->Width, drawBuffer->Height);
1765       }
1766
1767       if (newCtx->FirstTimeCurrent) {
1768          handle_first_current(newCtx);
1769          newCtx->FirstTimeCurrent = GL_FALSE;
1770       }
1771    }
1772
1773    return GL_TRUE;
1774 }
1775
1776
1777 /**
1778  * Make context 'ctx' share the display lists, textures and programs
1779  * that are associated with 'ctxToShare'.
1780  * Any display lists, textures or programs associated with 'ctx' will
1781  * be deleted if nobody else is sharing them.
1782  */
1783 GLboolean
1784 _mesa_share_state(struct gl_context *ctx, struct gl_context *ctxToShare)
1785 {
1786    if (ctx && ctxToShare && ctx->Shared && ctxToShare->Shared) {
1787       struct gl_shared_state *oldShared = NULL;
1788
1789       /* save ref to old state to prevent it from being deleted immediately */
1790       _mesa_reference_shared_state(ctx, &oldShared, ctx->Shared);
1791
1792       /* update ctx's Shared pointer */
1793       _mesa_reference_shared_state(ctx, &ctx->Shared, ctxToShare->Shared);
1794
1795       update_default_objects(ctx);
1796
1797       /* release the old shared state */
1798       _mesa_reference_shared_state(ctx, &oldShared, NULL);
1799
1800       return GL_TRUE;
1801    }
1802    else {
1803       return GL_FALSE;
1804    }
1805 }
1806
1807
1808
1809 /**
1810  * \return pointer to the current GL context for this thread.
1811  *
1812  * Calls _glapi_get_context(). This isn't the fastest way to get the current
1813  * context.  If you need speed, see the #GET_CURRENT_CONTEXT macro in
1814  * context.h.
1815  */
1816 struct gl_context *
1817 _mesa_get_current_context( void )
1818 {
1819    return (struct gl_context *) _glapi_get_context();
1820 }
1821
1822
1823 /**
1824  * Get context's current API dispatch table.
1825  *
1826  * It'll either be the immediate-mode execute dispatcher, the display list
1827  * compile dispatcher, or the thread marshalling dispatcher.
1828  *
1829  * \param ctx GL context.
1830  *
1831  * \return pointer to dispatch_table.
1832  *
1833  * Simply returns __struct gl_contextRec::CurrentClientDispatch.
1834  */
1835 struct _glapi_table *
1836 _mesa_get_dispatch(struct gl_context *ctx)
1837 {
1838    return ctx->CurrentClientDispatch;
1839 }
1840
1841 /*@}*/
1842
1843
1844 /**********************************************************************/
1845 /** \name Miscellaneous functions                                     */
1846 /**********************************************************************/
1847 /*@{*/
1848 /**
1849  * Flush commands.
1850  */
1851 void
1852 _mesa_flush(struct gl_context *ctx)
1853 {
1854    FLUSH_VERTICES( ctx, 0 );
1855    FLUSH_CURRENT( ctx, 0 );
1856    if (ctx->Driver.Flush) {
1857       ctx->Driver.Flush(ctx);
1858    }
1859 }
1860
1861
1862
1863 /**
1864  * Flush commands and wait for completion.
1865  *
1866  * Calls the #ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH macro and the
1867  * dd_function_table::Finish driver callback, if not NULL.
1868  */
1869 void GLAPIENTRY
1870 _mesa_Finish(void)
1871 {
1872    GET_CURRENT_CONTEXT(ctx);
1873    ASSERT_OUTSIDE_BEGIN_END(ctx);
1874
1875    FLUSH_VERTICES(ctx, 0);
1876    FLUSH_CURRENT(ctx, 0);
1877
1878    if (ctx->Driver.Finish) {
1879       ctx->Driver.Finish(ctx);
1880    }
1881 }
1882
1883
1884 /**
1885  * Execute glFlush().
1886  *
1887  * Calls the #ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH macro and the
1888  * dd_function_table::Flush driver callback, if not NULL.
1889  */
1890 void GLAPIENTRY
1891 _mesa_Flush(void)
1892 {
1893    GET_CURRENT_CONTEXT(ctx);
1894    ASSERT_OUTSIDE_BEGIN_END(ctx);
1895    _mesa_flush(ctx);
1896 }
1897
1898
1899 /*@}*/