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 "blend.h"
  87 #include "buffers.h"
  88 #include "bufferobj.h"
  89 #include "context.h"
  90 #include "cpuinfo.h"
  91 #include "debug.h"
  92 #include "debug_output.h"
  93 #include "depth.h"
  94 #include "dlist.h"
  95 #include "eval.h"
  96 #include "extensions.h"
  97 #include "fbobject.h"
  98 #include "feedback.h"
  99 #include "fog.h"
 100 #include "formats.h"
 101 #include "framebuffer.h"
 102 #include "hint.h"
 103 #include "hash.h"
 104 #include "light.h"
 105 #include "lines.h"
 106 #include "macros.h"
 107 #include "matrix.h"
 108 #include "multisample.h"
 109 #include "performance_monitor.h"
 110 #include "pipelineobj.h"
 111 #include "pixel.h"
 112 #include "pixelstore.h"
 113 #include "points.h"
 114 #include "polygon.h"
 115 #include "queryobj.h"
 116 #include "syncobj.h"
 117 #include "rastpos.h"
 118 #include "remap.h"
 119 #include "scissor.h"
 120 #include "shared.h"
 121 #include "shaderobj.h"
 122 #include "shaderimage.h"
 123 #include "util/simple_list.h"
 124 #include "util/strtod.h"
 125 #include "state.h"
 126 #include "stencil.h"
 127 #include "texcompress_s3tc.h"
 128 #include "texstate.h"
 129 #include "transformfeedback.h"
 130 #include "mtypes.h"
 131 #include "varray.h"
 132 #include "version.h"
 133 #include "viewport.h"
 134 #include "vtxfmt.h"
 135 #include "program/program.h"
 136 #include "program/prog_print.h"
 137 #include "math/m_matrix.h"
 138 #include "main/dispatch.h" /* for _gloffset_COUNT */
 139 #include "uniforms.h"
 140 #include "macros.h"
 141
 142 #ifdef USE_SPARC_ASM
 143 #include "sparc/sparc.h"
 144 #endif
 145
 146 #include "compiler/glsl/glsl_parser_extras.h"
 147 #include <stdbool.h>
 148
 149
 150 #ifndef MESA_VERBOSE
 151 int MESA_VERBOSE = 0;
 152 #endif
 153
 154 #ifndef MESA_DEBUG_FLAGS
 155 int MESA_DEBUG_FLAGS = 0;
 156 #endif
 157
 158
 159 /* ubyte -> float conversion */
 160 GLfloat _mesa_ubyte_to_float_color_tab[256];
 161
 162
 163
 164 /**
 165  * Swap buffers notification callback.
 166  *
 167  * \param ctx GL context.
 168  *
 169  * Called by window system just before swapping buffers.
 170  * We have to finish any pending rendering.
 171  */
 172 void
 173 _mesa_notifySwapBuffers(struct gl_context *ctx)
 174 {
 175    if (MESA_VERBOSE & VERBOSE_SWAPBUFFERS)
 176       _mesa_debug(ctx, "SwapBuffers\n");
 177    FLUSH_CURRENT( ctx, 0 );
 178    if (ctx->Driver.Flush) {
 179       ctx->Driver.Flush(ctx);
 180    }
 181 }
 182
 183
 184 /**********************************************************************/
 185 /** \name GL Visual allocation/destruction                            */
 186 /**********************************************************************/
 187 /*@{*/
 188
 189 /**
 190  * Allocates a struct gl_config structure and initializes it via
 191  * _mesa_initialize_visual().
 192  *
 193  * \param dbFlag double buffering
 194  * \param stereoFlag stereo buffer
 195  * \param depthBits requested bits per depth buffer value. Any value in [0, 32]
 196  * is acceptable but the actual depth type will be GLushort or GLuint as
 197  * needed.
 198  * \param stencilBits requested minimum bits per stencil buffer value
 199  * \param accumRedBits, accumGreenBits, accumBlueBits, accumAlphaBits number
 200  * of bits per color component in accum buffer.
 201  * \param indexBits number of bits per pixel if \p rgbFlag is GL_FALSE
 202  * \param redBits number of bits per color component in frame buffer for RGB(A)
 203  * mode.  We always use 8 in core Mesa though.
 204  * \param greenBits same as above.
 205  * \param blueBits same as above.
 206  * \param alphaBits same as above.
 207  * \param numSamples not really used.
 208  *
 209  * \return pointer to new struct gl_config or NULL if requested parameters
 210  * can't be met.
 211  *
 212  * \note Need to add params for level and numAuxBuffers (at least)
 213  */
 214 struct gl_config *
 215 _mesa_create_visual( GLboolean dbFlag,
 216                      GLboolean stereoFlag,
 217                      GLint redBits,
 218                      GLint greenBits,
 219                      GLint blueBits,
 220                      GLint alphaBits,
 221                      GLint depthBits,
 222                      GLint stencilBits,
 223                      GLint accumRedBits,
 224                      GLint accumGreenBits,
 225                      GLint accumBlueBits,
 226                      GLint accumAlphaBits,
 227                      GLint numSamples )
 228 {
 229    struct gl_config *vis = CALLOC_STRUCT(gl_config);
 230    if (vis) {
 231       if (!_mesa_initialize_visual(vis, dbFlag, stereoFlag,
 232                                    redBits, greenBits, blueBits, alphaBits,
 233                                    depthBits, stencilBits,
 234                                    accumRedBits, accumGreenBits,
 235                                    accumBlueBits, accumAlphaBits,
 236                                    numSamples)) {
 237          free(vis);
 238          return NULL;
 239       }
 240    }
 241    return vis;
 242 }
 243
 244
 245 /**
 246  * Makes some sanity checks and fills in the fields of the struct
 247  * gl_config object with the given parameters.  If the caller needs to
 248  * set additional fields, he should just probably init the whole
 249  * gl_config object himself.
 250  *
 251  * \return GL_TRUE on success, or GL_FALSE on failure.
 252  *
 253  * \sa _mesa_create_visual() above for the parameter description.
 254  */
 255 GLboolean
 256 _mesa_initialize_visual( struct gl_config *vis,
 257                          GLboolean dbFlag,
 258                          GLboolean stereoFlag,
 259                          GLint redBits,
 260                          GLint greenBits,
 261                          GLint blueBits,
 262                          GLint alphaBits,
 263                          GLint depthBits,
 264                          GLint stencilBits,
 265                          GLint accumRedBits,
 266                          GLint accumGreenBits,
 267                          GLint accumBlueBits,
 268                          GLint accumAlphaBits,
 269                          GLint numSamples )
 270 {
 271    assert(vis);
 272
 273    if (depthBits < 0 || depthBits > 32) {
 274       return GL_FALSE;
 275    }
 276    if (stencilBits < 0 || stencilBits > 8) {
 277       return GL_FALSE;
 278    }
 279    assert(accumRedBits >= 0);
 280    assert(accumGreenBits >= 0);
 281    assert(accumBlueBits >= 0);
 282    assert(accumAlphaBits >= 0);
 283
 284    vis->rgbMode          = GL_TRUE;
 285    vis->doubleBufferMode = dbFlag;
 286    vis->stereoMode       = stereoFlag;
 287
 288    vis->redBits          = redBits;
 289    vis->greenBits        = greenBits;
 290    vis->blueBits         = blueBits;
 291    vis->alphaBits        = alphaBits;
 292    vis->rgbBits          = redBits + greenBits + blueBits;
 293
 294    vis->indexBits      = 0;
 295    vis->depthBits      = depthBits;
 296    vis->stencilBits    = stencilBits;
 297
 298    vis->accumRedBits   = accumRedBits;
 299    vis->accumGreenBits = accumGreenBits;
 300    vis->accumBlueBits  = accumBlueBits;
 301    vis->accumAlphaBits = accumAlphaBits;
 302
 303    vis->haveAccumBuffer   = accumRedBits > 0;
 304    vis->haveDepthBuffer   = depthBits > 0;
 305    vis->haveStencilBuffer = stencilBits > 0;
 306
 307    vis->numAuxBuffers = 0;
 308    vis->level = 0;
 309    vis->sampleBuffers = numSamples > 0 ? 1 : 0;
 310    vis->samples = numSamples;
 311
 312    return GL_TRUE;
 313 }
 314
 315
 316 /**
 317  * Destroy a visual and free its memory.
 318  *
 319  * \param vis visual.
 320  *
 321  * Frees the visual structure.
 322  */
 323 void
 324 _mesa_destroy_visual( struct gl_config *vis )
 325 {
 326    free(vis);
 327 }
 328
 329 /*@}*/
 330
 331
 332 /**********************************************************************/
 333 /** \name Context allocation, initialization, destroying
 334  *
 335  * The purpose of the most initialization functions here is to provide the
 336  * default state values according to the OpenGL specification.
 337  */
 338 /**********************************************************************/
 339 /*@{*/
 340
 341
 342 /**
 343  * One-time initialization mutex lock.
 344  *
 345  * \sa Used by one_time_init().
 346  */
 347 mtx_t OneTimeLock = _MTX_INITIALIZER_NP;
 348
 349
 350 /**
 351  * Calls all the various one-time-fini functions in Mesa
 352  */
 353
 354 static void
 355 one_time_fini(void)
 356 {
 357    _mesa_destroy_shader_compiler();
 358    _mesa_locale_fini();
 359 }
 360
 361 /**
 362  * Calls all the various one-time-init functions in Mesa.
 363  *
 364  * While holding a global mutex lock, calls several initialization functions,
 365  * and sets the glapi callbacks if the \c MESA_DEBUG environment variable is
 366  * defined.
 367  *
 368  * \sa _math_init().
 369  */
 370 static void
 371 one_time_init( struct gl_context *ctx )
 372 {
 373    static GLbitfield api_init_mask = 0x0;
 374
 375    mtx_lock(&OneTimeLock);
 376
 377    /* truly one-time init */
 378    if (!api_init_mask) {
 379       GLuint i;
 380
 381       STATIC_ASSERT(sizeof(GLbyte) == 1);
 382       STATIC_ASSERT(sizeof(GLubyte) == 1);
 383       STATIC_ASSERT(sizeof(GLshort) == 2);
 384       STATIC_ASSERT(sizeof(GLushort) == 2);
 385       STATIC_ASSERT(sizeof(GLint) == 4);
 386       STATIC_ASSERT(sizeof(GLuint) == 4);
 387
 388       _mesa_locale_init();
 389
 390       _mesa_one_time_init_extension_overrides();
 391
 392       _mesa_get_cpu_features();
 393
 394       for (i = 0; i < 256; i++) {
 395          _mesa_ubyte_to_float_color_tab[i] = (float) i / 255.0F;
 396       }
 397
 398       atexit(one_time_fini);
 399
 400 #if defined(DEBUG) && defined(__DATE__) && defined(__TIME__)
 401       if (MESA_VERBOSE != 0) {
 402          _mesa_debug(ctx, "Mesa %s DEBUG build %s %s\n",
 403                      PACKAGE_VERSION, __DATE__, __TIME__);
 404       }
 405 #endif
 406    }
 407
 408    /* per-API one-time init */
 409    if (!(api_init_mask & (1 << ctx->API))) {
 410       _mesa_init_get_hash(ctx);
 411
 412       _mesa_init_remap_table();
 413    }
 414
 415    api_init_mask |= 1 << ctx->API;
 416
 417    mtx_unlock(&OneTimeLock);
 418 }
 419
 420
 421 /**
 422  * Initialize fields of gl_current_attrib (aka ctx->Current.*)
 423  */
 424 static void
 425 _mesa_init_current(struct gl_context *ctx)
 426 {
 427    GLuint i;
 428
 429    /* Init all to (0,0,0,1) */
 430    for (i = 0; i < ARRAY_SIZE(ctx->Current.Attrib); i++) {
 431       ASSIGN_4V( ctx->Current.Attrib[i], 0.0, 0.0, 0.0, 1.0 );
 432    }
 433
 434    /* redo special cases: */
 435    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_WEIGHT], 1.0, 0.0, 0.0, 0.0 );
 436    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_NORMAL], 0.0, 0.0, 1.0, 1.0 );
 437    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_COLOR0], 1.0, 1.0, 1.0, 1.0 );
 438    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_COLOR1], 0.0, 0.0, 0.0, 1.0 );
 439    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_COLOR_INDEX], 1.0, 0.0, 0.0, 1.0 );
 440    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_EDGEFLAG], 1.0, 0.0, 0.0, 1.0 );
 441 }
 442
 443
 444 /**
 445  * Init vertex/fragment/geometry program limits.
 446  * Important: drivers should override these with actual limits.
 447  */
 448 static void
 449 init_program_limits(struct gl_constants *consts, gl_shader_stage stage,
 450                     struct gl_program_constants *prog)
 451 {
 452    prog->MaxInstructions = MAX_PROGRAM_INSTRUCTIONS;
 453    prog->MaxAluInstructions = MAX_PROGRAM_INSTRUCTIONS;
 454    prog->MaxTexInstructions = MAX_PROGRAM_INSTRUCTIONS;
 455    prog->MaxTexIndirections = MAX_PROGRAM_INSTRUCTIONS;
 456    prog->MaxTemps = MAX_PROGRAM_TEMPS;
 457    prog->MaxEnvParams = MAX_PROGRAM_ENV_PARAMS;
 458    prog->MaxLocalParams = MAX_PROGRAM_LOCAL_PARAMS;
 459    prog->MaxAddressOffset = MAX_PROGRAM_LOCAL_PARAMS;
 460
 461    switch (stage) {
 462    case MESA_SHADER_VERTEX:
 463       prog->MaxParameters = MAX_VERTEX_PROGRAM_PARAMS;
 464       prog->MaxAttribs = MAX_VERTEX_GENERIC_ATTRIBS;
 465       prog->MaxAddressRegs = MAX_VERTEX_PROGRAM_ADDRESS_REGS;
 466       prog->MaxUniformComponents = 4 * MAX_UNIFORMS;
 467       prog->MaxInputComponents = 0; /* value not used */
 468       prog->MaxOutputComponents = 16 * 4; /* old limit not to break tnl and swrast */
 469       break;
 470    case MESA_SHADER_FRAGMENT:
 471       prog->MaxParameters = MAX_FRAGMENT_PROGRAM_PARAMS;
 472       prog->MaxAttribs = MAX_FRAGMENT_PROGRAM_INPUTS;
 473       prog->MaxAddressRegs = MAX_FRAGMENT_PROGRAM_ADDRESS_REGS;
 474       prog->MaxUniformComponents = 4 * MAX_UNIFORMS;
 475       prog->MaxInputComponents = 16 * 4; /* old limit not to break tnl and swrast */
 476       prog->MaxOutputComponents = 0; /* value not used */
 477       break;
 478    case MESA_SHADER_TESS_CTRL:
 479    case MESA_SHADER_TESS_EVAL:
 480    case MESA_SHADER_GEOMETRY:
 481       prog->MaxParameters = MAX_VERTEX_PROGRAM_PARAMS;
 482       prog->MaxAttribs = MAX_VERTEX_GENERIC_ATTRIBS;
 483       prog->MaxAddressRegs = MAX_VERTEX_PROGRAM_ADDRESS_REGS;
 484       prog->MaxUniformComponents = 4 * MAX_UNIFORMS;
 485       prog->MaxInputComponents = 16 * 4; /* old limit not to break tnl and swrast */
 486       prog->MaxOutputComponents = 16 * 4; /* old limit not to break tnl and swrast */
 487       break;
 488    case MESA_SHADER_COMPUTE:
 489       prog->MaxParameters = 0; /* not meaningful for compute shaders */
 490       prog->MaxAttribs = 0; /* not meaningful for compute shaders */
 491       prog->MaxAddressRegs = 0; /* not meaningful for compute shaders */
 492       prog->MaxUniformComponents = 4 * MAX_UNIFORMS;
 493       prog->MaxInputComponents = 0; /* not meaningful for compute shaders */
 494       prog->MaxOutputComponents = 0; /* not meaningful for compute shaders */
 495       break;
 496    default:
 497       assert(0 && "Bad shader stage in init_program_limits()");
 498    }
 499
 500    /* Set the native limits to zero.  This implies that there is no native
 501     * support for shaders.  Let the drivers fill in the actual values.
 502     */
 503    prog->MaxNativeInstructions = 0;
 504    prog->MaxNativeAluInstructions = 0;
 505    prog->MaxNativeTexInstructions = 0;
 506    prog->MaxNativeTexIndirections = 0;
 507    prog->MaxNativeAttribs = 0;
 508    prog->MaxNativeTemps = 0;
 509    prog->MaxNativeAddressRegs = 0;
 510    prog->MaxNativeParameters = 0;
 511
 512    /* Set GLSL datatype range/precision info assuming IEEE float values.
 513     * Drivers should override these defaults as needed.
 514     */
 515    prog->MediumFloat.RangeMin = 127;
 516    prog->MediumFloat.RangeMax = 127;
 517    prog->MediumFloat.Precision = 23;
 518    prog->LowFloat = prog->HighFloat = prog->MediumFloat;
 519
 520    /* Assume ints are stored as floats for now, since this is the least-common
 521     * denominator.  The OpenGL ES spec implies (page 132) that the precision
 522     * of integer types should be 0.  Practically speaking, IEEE
 523     * single-precision floating point values can only store integers in the
 524     * range [-0x01000000, 0x01000000] without loss of precision.
 525     */
 526    prog->MediumInt.RangeMin = 24;
 527    prog->MediumInt.RangeMax = 24;
 528    prog->MediumInt.Precision = 0;
 529    prog->LowInt = prog->HighInt = prog->MediumInt;
 530
 531    prog->MaxUniformBlocks = 12;
 532    prog->MaxCombinedUniformComponents = (prog->MaxUniformComponents +
 533                                          consts->MaxUniformBlockSize / 4 *
 534                                          prog->MaxUniformBlocks);
 535
 536    prog->MaxAtomicBuffers = 0;
 537    prog->MaxAtomicCounters = 0;
 538
 539    prog->MaxShaderStorageBlocks = 8;
 540 }
 541
 542
 543 /**
 544  * Initialize fields of gl_constants (aka ctx->Const.*).
 545  * Use defaults from config.h.  The device drivers will often override
 546  * some of these values (such as number of texture units).
 547  */
 548 void
 549 _mesa_init_constants(struct gl_constants *consts, gl_api api)
 550 {
 551    int i;
 552    assert(consts);
 553
 554    /* Constants, may be overriden (usually only reduced) by device drivers */
 555    consts->MaxTextureMbytes = MAX_TEXTURE_MBYTES;
 556    consts->MaxTextureLevels = MAX_TEXTURE_LEVELS;
 557    consts->Max3DTextureLevels = MAX_3D_TEXTURE_LEVELS;
 558    consts->MaxCubeTextureLevels = MAX_CUBE_TEXTURE_LEVELS;
 559    consts->MaxTextureRectSize = MAX_TEXTURE_RECT_SIZE;
 560    consts->MaxArrayTextureLayers = MAX_ARRAY_TEXTURE_LAYERS;
 561    consts->MaxTextureCoordUnits = MAX_TEXTURE_COORD_UNITS;
 562    consts->Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits = MAX_TEXTURE_IMAGE_UNITS;
 563    consts->MaxTextureUnits = MIN2(consts->MaxTextureCoordUnits,
 564                                      consts->Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits);
 565    consts->MaxTextureMaxAnisotropy = MAX_TEXTURE_MAX_ANISOTROPY;
 566    consts->MaxTextureLodBias = MAX_TEXTURE_LOD_BIAS;
 567    consts->MaxTextureBufferSize = 65536;
 568    consts->TextureBufferOffsetAlignment = 1;
 569    consts->MaxArrayLockSize = MAX_ARRAY_LOCK_SIZE;
 570    consts->SubPixelBits = SUB_PIXEL_BITS;
 571    consts->MinPointSize = MIN_POINT_SIZE;
 572    consts->MaxPointSize = MAX_POINT_SIZE;
 573    consts->MinPointSizeAA = MIN_POINT_SIZE;
 574    consts->MaxPointSizeAA = MAX_POINT_SIZE;
 575    consts->PointSizeGranularity = (GLfloat) POINT_SIZE_GRANULARITY;
 576    consts->MinLineWidth = MIN_LINE_WIDTH;
 577    consts->MaxLineWidth = MAX_LINE_WIDTH;
 578    consts->MinLineWidthAA = MIN_LINE_WIDTH;
 579    consts->MaxLineWidthAA = MAX_LINE_WIDTH;
 580    consts->LineWidthGranularity = (GLfloat) LINE_WIDTH_GRANULARITY;
 581    consts->MaxClipPlanes = 6;
 582    consts->MaxLights = MAX_LIGHTS;
 583    consts->MaxShininess = 128.0;
 584    consts->MaxSpotExponent = 128.0;
 585    consts->MaxViewportWidth = 16384;
 586    consts->MaxViewportHeight = 16384;
 587    consts->MinMapBufferAlignment = 64;
 588
 589    /* Driver must override these values if ARB_viewport_array is supported. */
 590    consts->MaxViewports = 1;
 591    consts->ViewportSubpixelBits = 0;
 592    consts->ViewportBounds.Min = 0;
 593    consts->ViewportBounds.Max = 0;
 594
 595    /** GL_ARB_uniform_buffer_object */
 596    consts->MaxCombinedUniformBlocks = 36;
 597    consts->MaxUniformBufferBindings = 36;
 598    consts->MaxUniformBlockSize = 16384;
 599    consts->UniformBufferOffsetAlignment = 1;
 600
 601    /** GL_ARB_shader_storage_buffer_object */
 602    consts->MaxCombinedShaderStorageBlocks = 8;
 603    consts->MaxShaderStorageBufferBindings = 8;
 604    consts->MaxShaderStorageBlockSize = 128 * 1024 * 1024; /* 2^27 */
 605    consts->ShaderStorageBufferOffsetAlignment = 256;
 606
 607    /* GL_ARB_explicit_uniform_location, GL_MAX_UNIFORM_LOCATIONS */
 608    consts->MaxUserAssignableUniformLocations =
 609       4 * MESA_SHADER_STAGES * MAX_UNIFORMS;
 610
 611    for (i = 0; i < MESA_SHADER_STAGES; i++)
 612       init_program_limits(consts, i, &consts->Program[i]);
 613
 614    consts->MaxProgramMatrices = MAX_PROGRAM_MATRICES;
 615    consts->MaxProgramMatrixStackDepth = MAX_PROGRAM_MATRIX_STACK_DEPTH;
 616
 617    /* Assume that if GLSL 1.30+ (or GLSL ES 3.00+) is supported that
 618     * gl_VertexID is implemented using a native hardware register with OpenGL
 619     * semantics.
 620     */
 621    consts->VertexID_is_zero_based = false;
 622
 623    /* GL_ARB_draw_buffers */
 624    consts->MaxDrawBuffers = MAX_DRAW_BUFFERS;
 625
 626    consts->MaxColorAttachments = MAX_COLOR_ATTACHMENTS;
 627    consts->MaxRenderbufferSize = MAX_RENDERBUFFER_SIZE;
 628
 629    consts->Program[MESA_SHADER_VERTEX].MaxTextureImageUnits = MAX_TEXTURE_IMAGE_UNITS;
 630    consts->MaxCombinedTextureImageUnits = MAX_COMBINED_TEXTURE_IMAGE_UNITS;
 631    consts->MaxVarying = 16; /* old limit not to break tnl and swrast */
 632    consts->Program[MESA_SHADER_GEOMETRY].MaxTextureImageUnits = MAX_TEXTURE_IMAGE_UNITS;
 633    consts->MaxGeometryOutputVertices = MAX_GEOMETRY_OUTPUT_VERTICES;
 634    consts->MaxGeometryTotalOutputComponents = MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS;
 635
 636    /* Shading language version */
 637    consts->GLSLVersion = 120;
 638    _mesa_override_glsl_version(consts);
 639
 640 #ifdef DEBUG
 641    consts->GenerateTemporaryNames = true;
 642 #else
 643    consts->GenerateTemporaryNames = false;
 644 #endif
 645
 646    /* GL_ARB_framebuffer_object */
 647    consts->MaxSamples = 0;
 648
 649    /* GLSL default if NativeIntegers == FALSE */
 650    consts->UniformBooleanTrue = FLOAT_AS_UNION(1.0f).u;
 651
 652    /* GL_ARB_sync */
 653    consts->MaxServerWaitTimeout = 0x1fff7fffffffULL;
 654
 655    /* GL_EXT_provoking_vertex */
 656    consts->QuadsFollowProvokingVertexConvention = GL_TRUE;
 657
 658    /** GL_ARB_viewport_array */
 659    consts->LayerAndVPIndexProvokingVertex = GL_UNDEFINED_VERTEX;
 660
 661    /* GL_EXT_transform_feedback */
 662    consts->MaxTransformFeedbackBuffers = MAX_FEEDBACK_BUFFERS;
 663    consts->MaxTransformFeedbackSeparateComponents = 4 * MAX_FEEDBACK_ATTRIBS;
 664    consts->MaxTransformFeedbackInterleavedComponents = 4 * MAX_FEEDBACK_ATTRIBS;
 665    consts->MaxVertexStreams = 1;
 666
 667    /* GL 3.2  */
 668    consts->ProfileMask = api == API_OPENGL_CORE
 669                           ? GL_CONTEXT_CORE_PROFILE_BIT
 670                           : GL_CONTEXT_COMPATIBILITY_PROFILE_BIT;
 671
 672    /* GL 4.4 */
 673    consts->MaxVertexAttribStride = 2048;
 674
 675    /** GL_EXT_gpu_shader4 */
 676    consts->MinProgramTexelOffset = -8;
 677    consts->MaxProgramTexelOffset = 7;
 678
 679    /* GL_ARB_texture_gather */
 680    consts->MinProgramTextureGatherOffset = -8;
 681    consts->MaxProgramTextureGatherOffset = 7;
 682
 683    /* GL_ARB_robustness */
 684    consts->ResetStrategy = GL_NO_RESET_NOTIFICATION_ARB;
 685
 686    /* ES 3.0 or ARB_ES3_compatibility */
 687    consts->MaxElementIndex = 0xffffffffu;
 688
 689    /* GL_ARB_texture_multisample */
 690    consts->MaxColorTextureSamples = 1;
 691    consts->MaxDepthTextureSamples = 1;
 692    consts->MaxIntegerSamples = 1;
 693
 694    /* GL_ARB_shader_atomic_counters */
 695    consts->MaxAtomicBufferBindings = MAX_COMBINED_ATOMIC_BUFFERS;
 696    consts->MaxAtomicBufferSize = MAX_ATOMIC_COUNTERS * ATOMIC_COUNTER_SIZE;
 697    consts->MaxCombinedAtomicBuffers = MAX_COMBINED_ATOMIC_BUFFERS;
 698    consts->MaxCombinedAtomicCounters = MAX_ATOMIC_COUNTERS;
 699
 700    /* GL_ARB_vertex_attrib_binding */
 701    consts->MaxVertexAttribRelativeOffset = 2047;
 702    consts->MaxVertexAttribBindings = MAX_VERTEX_GENERIC_ATTRIBS;
 703
 704    /* GL_ARB_compute_shader */
 705    consts->MaxComputeWorkGroupCount[0] = 65535;
 706    consts->MaxComputeWorkGroupCount[1] = 65535;
 707    consts->MaxComputeWorkGroupCount[2] = 65535;
 708    consts->MaxComputeWorkGroupSize[0] = 1024;
 709    consts->MaxComputeWorkGroupSize[1] = 1024;
 710    consts->MaxComputeWorkGroupSize[2] = 64;
 711    /* Enables compute support for GLES 3.1 if >= 128 */
 712    consts->MaxComputeWorkGroupInvocations = 0;
 713
 714    /** GL_ARB_gpu_shader5 */
 715    consts->MinFragmentInterpolationOffset = MIN_FRAGMENT_INTERPOLATION_OFFSET;
 716    consts->MaxFragmentInterpolationOffset = MAX_FRAGMENT_INTERPOLATION_OFFSET;
 717
 718    /** GL_KHR_context_flush_control */
 719    consts->ContextReleaseBehavior = GL_CONTEXT_RELEASE_BEHAVIOR_FLUSH;
 720
 721    /** GL_ARB_tessellation_shader */
 722    consts->MaxTessGenLevel = MAX_TESS_GEN_LEVEL;
 723    consts->MaxPatchVertices = MAX_PATCH_VERTICES;
 724    consts->Program[MESA_SHADER_TESS_CTRL].MaxTextureImageUnits = MAX_TEXTURE_IMAGE_UNITS;
 725    consts->Program[MESA_SHADER_TESS_EVAL].MaxTextureImageUnits = MAX_TEXTURE_IMAGE_UNITS;
 726    consts->MaxTessPatchComponents = MAX_TESS_PATCH_COMPONENTS;
 727    consts->MaxTessControlTotalOutputComponents = MAX_TESS_CONTROL_TOTAL_OUTPUT_COMPONENTS;
 728 }
 729
 730
 731 /**
 732  * Do some sanity checks on the limits/constants for the given context.
 733  * Only called the first time a context is bound.
 734  */
 735 static void
 736 check_context_limits(struct gl_context *ctx)
 737 {
 738    (void) ctx;
 739
 740    /* check that we don't exceed the size of various bitfields */
 741    assert(VARYING_SLOT_MAX <=
 742           (8 * sizeof(ctx->VertexProgram._Current->Base.OutputsWritten)));
 743    assert(VARYING_SLOT_MAX <=
 744           (8 * sizeof(ctx->FragmentProgram._Current->Base.InputsRead)));
 745
 746    /* shader-related checks */
 747    assert(ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxLocalParams <= MAX_PROGRAM_LOCAL_PARAMS);
 748    assert(ctx->Const.Program[MESA_SHADER_VERTEX].MaxLocalParams <= MAX_PROGRAM_LOCAL_PARAMS);
 749
 750    /* Texture unit checks */
 751    assert(ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits > 0);
 752    assert(ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits <= MAX_TEXTURE_IMAGE_UNITS);
 753    assert(ctx->Const.MaxTextureCoordUnits > 0);
 754    assert(ctx->Const.MaxTextureCoordUnits <= MAX_TEXTURE_COORD_UNITS);
 755    assert(ctx->Const.MaxTextureUnits > 0);
 756    assert(ctx->Const.MaxTextureUnits <= MAX_TEXTURE_IMAGE_UNITS);
 757    assert(ctx->Const.MaxTextureUnits <= MAX_TEXTURE_COORD_UNITS);
 758    assert(ctx->Const.MaxTextureUnits == MIN2(ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits,
 759                                              ctx->Const.MaxTextureCoordUnits));
 760    assert(ctx->Const.MaxCombinedTextureImageUnits > 0);
 761    assert(ctx->Const.MaxCombinedTextureImageUnits <= MAX_COMBINED_TEXTURE_IMAGE_UNITS);
 762    assert(ctx->Const.MaxTextureCoordUnits <= MAX_COMBINED_TEXTURE_IMAGE_UNITS);
 763    /* number of coord units cannot be greater than number of image units */
 764    assert(ctx->Const.MaxTextureCoordUnits <= ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits);
 765
 766
 767    /* Texture size checks */
 768    assert(ctx->Const.MaxTextureLevels <= MAX_TEXTURE_LEVELS);
 769    assert(ctx->Const.Max3DTextureLevels <= MAX_3D_TEXTURE_LEVELS);
 770    assert(ctx->Const.MaxCubeTextureLevels <= MAX_CUBE_TEXTURE_LEVELS);
 771    assert(ctx->Const.MaxTextureRectSize <= MAX_TEXTURE_RECT_SIZE);
 772
 773    /* Texture level checks */
 774    assert(MAX_TEXTURE_LEVELS >= MAX_3D_TEXTURE_LEVELS);
 775    assert(MAX_TEXTURE_LEVELS >= MAX_CUBE_TEXTURE_LEVELS);
 776
 777    /* Max texture size should be <= max viewport size (render to texture) */
 778    assert((1U << (ctx->Const.MaxTextureLevels - 1))
 779           <= ctx->Const.MaxViewportWidth);
 780    assert((1U << (ctx->Const.MaxTextureLevels - 1))
 781           <= ctx->Const.MaxViewportHeight);
 782
 783    assert(ctx->Const.MaxDrawBuffers <= MAX_DRAW_BUFFERS);
 784
 785    /* if this fails, add more enum values to gl_buffer_index */
 786    assert(BUFFER_COLOR0 + MAX_DRAW_BUFFERS <= BUFFER_COUNT);
 787
 788    /* XXX probably add more tests */
 789 }
 790
 791
 792 /**
 793  * Initialize the attribute groups in a GL context.
 794  *
 795  * \param ctx GL context.
 796  *
 797  * Initializes all the attributes, calling the respective <tt>init*</tt>
 798  * functions for the more complex data structures.
 799  */
 800 static GLboolean
 801 init_attrib_groups(struct gl_context *ctx)
 802 {
 803    assert(ctx);
 804
 805    /* Constants */
 806    _mesa_init_constants(&ctx->Const, ctx->API);
 807
 808    /* Extensions */
 809    _mesa_init_extensions(&ctx->Extensions);
 810
 811    /* Attribute Groups */
 812    _mesa_init_accum( ctx );
 813    _mesa_init_attrib( ctx );
 814    _mesa_init_buffer_objects( ctx );
 815    _mesa_init_color( ctx );
 816    _mesa_init_current( ctx );
 817    _mesa_init_depth( ctx );
 818    _mesa_init_debug( ctx );
 819    _mesa_init_debug_output( ctx );
 820    _mesa_init_display_list( ctx );
 821    _mesa_init_eval( ctx );
 822    _mesa_init_fbobjects( ctx );
 823    _mesa_init_feedback( ctx );
 824    _mesa_init_fog( ctx );
 825    _mesa_init_hint( ctx );
 826    _mesa_init_image_units( ctx );
 827    _mesa_init_line( ctx );
 828    _mesa_init_lighting( ctx );
 829    _mesa_init_matrix( ctx );
 830    _mesa_init_multisample( ctx );
 831    _mesa_init_performance_monitors( ctx );
 832    _mesa_init_pipeline( ctx );
 833    _mesa_init_pixel( ctx );
 834    _mesa_init_pixelstore( ctx );
 835    _mesa_init_point( ctx );
 836    _mesa_init_polygon( ctx );
 837    _mesa_init_program( ctx );
 838    _mesa_init_queryobj( ctx );
 839    _mesa_init_sync( ctx );
 840    _mesa_init_rastpos( ctx );
 841    _mesa_init_scissor( ctx );
 842    _mesa_init_shader_state( ctx );
 843    _mesa_init_stencil( ctx );
 844    _mesa_init_transform( ctx );
 845    _mesa_init_transform_feedback( ctx );
 846    _mesa_init_varray( ctx );
 847    _mesa_init_viewport( ctx );
 848
 849    if (!_mesa_init_texture( ctx ))
 850       return GL_FALSE;
 851
 852    _mesa_init_texture_s3tc( ctx );
 853
 854    /* Miscellaneous */
 855    ctx->NewState = _NEW_ALL;
 856    ctx->NewDriverState = ~0;
 857    ctx->ErrorValue = GL_NO_ERROR;
 858    ctx->ShareGroupReset = false;
 859    ctx->varying_vp_inputs = VERT_BIT_ALL;
 860
 861    return GL_TRUE;
 862 }
 863
 864
 865 /**
 866  * Update default objects in a GL context with respect to shared state.
 867  *
 868  * \param ctx GL context.
 869  *
 870  * Removes references to old default objects, (texture objects, program
 871  * objects, etc.) and changes to reference those from the current shared
 872  * state.
 873  */
 874 static GLboolean
 875 update_default_objects(struct gl_context *ctx)
 876 {
 877    assert(ctx);
 878
 879    _mesa_update_default_objects_program(ctx);
 880    _mesa_update_default_objects_texture(ctx);
 881    _mesa_update_default_objects_buffer_objects(ctx);
 882
 883    return GL_TRUE;
 884 }
 885
 886
 887 /* XXX this is temporary and should be removed at some point in the
 888  * future when there's a reasonable expectation that the libGL library
 889  * contains the _glapi_new_nop_table() and _glapi_set_nop_handler()
 890  * functions which were added in Mesa 10.6.
 891  */
 892 #if !defined(_WIN32)
 893 /* Avoid libGL / driver ABI break */
 894 #define USE_GLAPI_NOP_FEATURES 0
 895 #else
 896 #define USE_GLAPI_NOP_FEATURES 1
 897 #endif
 898
 899
 900 /**
 901  * This function is called by the glapi no-op functions.  For each OpenGL
 902  * function/entrypoint there's a simple no-op function.  These "no-op"
 903  * functions call this function.
 904  *
 905  * If there's a current OpenGL context for the calling thread, we record a
 906  * GL_INVALID_OPERATION error.  This can happen either because the app's
 907  * calling an unsupported extension function, or calling an illegal function
 908  * (such as glClear between glBegin/glEnd).
 909  *
 910  * If there's no current OpenGL context for the calling thread, we can
 911  * print a message to stderr.
 912  *
 913  * \param name  the name of the OpenGL function
 914  */
 915 #if USE_GLAPI_NOP_FEATURES
 916 static void
 917 nop_handler(const char *name)
 918 {
 919    GET_CURRENT_CONTEXT(ctx);
 920    if (ctx) {
 921       _mesa_error(ctx, GL_INVALID_OPERATION, "%s(invalid call)", name);
 922    }
 923 #if defined(DEBUG)
 924    else if (getenv("MESA_DEBUG") || getenv("LIBGL_DEBUG")) {
 925       fprintf(stderr,
 926               "GL User Error: gl%s called without a rendering context\n",
 927               name);
 928       fflush(stderr);
 929    }
 930 #endif
 931 }
 932 #endif
 933
 934
 935 /**
 936  * Special no-op glFlush, see below.
 937  */
 938 #if defined(_WIN32)
 939 static void GLAPIENTRY
 940 nop_glFlush(void)
 941 {
 942    /* don't record an error like we do in nop_handler() */
 943 }
 944 #endif
 945
 946
 947 #if !USE_GLAPI_NOP_FEATURES
 948 static int
 949 generic_nop(void)
 950 {
 951    GET_CURRENT_CONTEXT(ctx);
 952    _mesa_error(ctx, GL_INVALID_OPERATION,
 953                "unsupported function called "
 954                "(unsupported extension or deprecated function?)");
 955    return 0;
 956 }
 957 #endif
 958
 959
 960 /**
 961  * Create a new API dispatch table in which all entries point to the
 962  * generic_nop() function.  This will not work on Windows because of
 963  * the __stdcall convention which requires the callee to clean up the
 964  * call stack.  That's impossible with one generic no-op function.
 965  */
 966 struct _glapi_table *
 967 _mesa_new_nop_table(unsigned numEntries)
 968 {
 969    struct _glapi_table *table;
 970
 971 #if !USE_GLAPI_NOP_FEATURES
 972    table = malloc(numEntries * sizeof(_glapi_proc));
 973    if (table) {
 974       _glapi_proc *entry = (_glapi_proc *) table;
 975       unsigned i;
 976       for (i = 0; i < numEntries; i++) {
 977          entry[i] = (_glapi_proc) generic_nop;
 978       }
 979    }
 980 #else
 981    table = _glapi_new_nop_table(numEntries);
 982 #endif
 983    return table;
 984 }
 985
 986
 987 /**
 988  * Allocate and initialize a new dispatch table.  The table will be
 989  * populated with pointers to "no-op" functions.  In turn, the no-op
 990  * functions will call nop_handler() above.
 991  */
 992 static struct _glapi_table *
 993 alloc_dispatch_table(void)
 994 {
 995    /* Find the larger of Mesa's dispatch table and libGL's dispatch table.
 996     * In practice, this'll be the same for stand-alone Mesa.  But for DRI
 997     * Mesa we do this to accommodate different versions of libGL and various
 998     * DRI drivers.
 999     */
1000    int numEntries = MAX2(_glapi_get_dispatch_table_size(), _gloffset_COUNT);
1001
1002    struct _glapi_table *table = _mesa_new_nop_table(numEntries);
1003
1004 #if defined(_WIN32)
1005    if (table) {
1006       /* This is a special case for Windows in the event that
1007        * wglGetProcAddress is called between glBegin/End().
1008        *
1009        * The MS opengl32.dll library apparently calls glFlush from
1010        * wglGetProcAddress().  If we're inside glBegin/End(), glFlush
1011        * will dispatch to _mesa_generic_nop() and we'll generate a
1012        * GL_INVALID_OPERATION error.
1013        *
1014        * The specific case which hits this is piglit's primitive-restart
1015        * test which calls glPrimitiveRestartNV() inside glBegin/End.  The
1016        * first time we call glPrimitiveRestartNV() Piglit's API dispatch
1017        * code will try to resolve the function by calling wglGetProcAddress.
1018        * This raises GL_INVALID_OPERATION and an assert(glGetError()==0)
1019        * will fail causing the test to fail.  By suppressing the error, the
1020        * assertion passes and the test continues.
1021        */
1022       SET_Flush(table, nop_glFlush);
1023    }
1024 #endif
1025
1026 #if USE_GLAPI_NOP_FEATURES
1027    _glapi_set_nop_handler(nop_handler);
1028 #endif
1029
1030    return table;
1031 }
1032
1033 /**
1034  * Creates a minimal dispatch table for use within glBegin()/glEnd().
1035  *
1036  * This ensures that we generate GL_INVALID_OPERATION errors from most
1037  * functions, since the set of functions that are valid within Begin/End is
1038  * very small.
1039  *
1040  * From the GL 1.0 specification section 2.6.3, "GL Commands within
1041  * Begin/End"
1042  *
1043  *     "The only GL commands that are allowed within any Begin/End pairs are
1044  *      the commands for specifying vertex coordinates, vertex color, normal
1045  *      coordinates, and texture coordinates (Vertex, Color, Index, Normal,
1046  *      TexCoord), EvalCoord and EvalPoint commands (see section 5.1),
1047  *      commands for specifying lighting material parameters (Material
1048  *      commands see section 2.12.2), display list invocation commands
1049  *      (CallList and CallLists see section 5.4), and the EdgeFlag
1050  *      command. Executing Begin after Begin has already been executed but
1051  *      before an End is issued generates the INVALID OPERATION error, as does
1052  *      executing End without a previous corresponding Begin. Executing any
1053  *      other GL command within Begin/End results in the error INVALID
1054  *      OPERATION."
1055  *
1056  * The table entries for specifying vertex attributes are set up by
1057  * install_vtxfmt() and _mesa_loopback_init_api_table(), and End() and dlists
1058  * are set by install_vtxfmt() as well.
1059  */
1060 static struct _glapi_table *
1061 create_beginend_table(const struct gl_context *ctx)
1062 {
1063    struct _glapi_table *table;
1064
1065    table = alloc_dispatch_table();
1066    if (!table)
1067       return NULL;
1068
1069    /* Fill in functions which return a value, since they should return some
1070     * specific value even if they emit a GL_INVALID_OPERATION error from them
1071     * being called within glBegin()/glEnd().
1072     */
1073 #define COPY_DISPATCH(func) SET_##func(table, GET_##func(ctx->Exec))
1074
1075    COPY_DISPATCH(GenLists);
1076    COPY_DISPATCH(IsProgram);
1077    COPY_DISPATCH(IsVertexArray);
1078    COPY_DISPATCH(IsBuffer);
1079    COPY_DISPATCH(IsEnabled);
1080    COPY_DISPATCH(IsEnabledi);
1081    COPY_DISPATCH(IsRenderbuffer);
1082    COPY_DISPATCH(IsFramebuffer);
1083    COPY_DISPATCH(CheckFramebufferStatus);
1084    COPY_DISPATCH(RenderMode);
1085    COPY_DISPATCH(GetString);
1086    COPY_DISPATCH(GetStringi);
1087    COPY_DISPATCH(GetPointerv);
1088    COPY_DISPATCH(IsQuery);
1089    COPY_DISPATCH(IsSampler);
1090    COPY_DISPATCH(IsSync);
1091    COPY_DISPATCH(IsTexture);
1092    COPY_DISPATCH(IsTransformFeedback);
1093    COPY_DISPATCH(DeleteQueries);
1094    COPY_DISPATCH(AreTexturesResident);
1095    COPY_DISPATCH(FenceSync);
1096    COPY_DISPATCH(ClientWaitSync);
1097    COPY_DISPATCH(MapBuffer);
1098    COPY_DISPATCH(UnmapBuffer);
1099    COPY_DISPATCH(MapBufferRange);
1100    COPY_DISPATCH(ObjectPurgeableAPPLE);
1101    COPY_DISPATCH(ObjectUnpurgeableAPPLE);
1102
1103    _mesa_loopback_init_api_table(ctx, table);
1104
1105    return table;
1106 }
1107
1108 void
1109 _mesa_initialize_dispatch_tables(struct gl_context *ctx)
1110 {
1111    /* Do the code-generated setup of the exec table in api_exec.c. */
1112    _mesa_initialize_exec_table(ctx);
1113
1114    if (ctx->Save)
1115       _mesa_initialize_save_table(ctx);
1116 }
1117
1118 /**
1119  * Initialize a struct gl_context struct (rendering context).
1120  *
1121  * This includes allocating all the other structs and arrays which hang off of
1122  * the context by pointers.
1123  * Note that the driver needs to pass in its dd_function_table here since
1124  * we need to at least call driverFunctions->NewTextureObject to create the
1125  * default texture objects.
1126  *
1127  * Called by _mesa_create_context().
1128  *
1129  * Performs the imports and exports callback tables initialization, and
1130  * miscellaneous one-time initializations. If no shared context is supplied one
1131  * is allocated, and increase its reference count.  Setups the GL API dispatch
1132  * tables.  Initialize the TNL module. Sets the maximum Z buffer depth.
1133  * Finally queries the \c MESA_DEBUG and \c MESA_VERBOSE environment variables
1134  * for debug flags.
1135  *
1136  * \param ctx the context to initialize
1137  * \param api the GL API type to create the context for
1138  * \param visual describes the visual attributes for this context or NULL to
1139  *               create a configless context
1140  * \param share_list points to context to share textures, display lists,
1141  *        etc with, or NULL
1142  * \param driverFunctions table of device driver functions for this context
1143  *        to use
1144  */
1145 GLboolean
1146 _mesa_initialize_context(struct gl_context *ctx,
1147                          gl_api api,
1148                          const struct gl_config *visual,
1149                          struct gl_context *share_list,
1150                          const struct dd_function_table *driverFunctions)
1151 {
1152    struct gl_shared_state *shared;
1153    int i;
1154
1155    assert(driverFunctions->NewTextureObject);
1156    assert(driverFunctions->FreeTextureImageBuffer);
1157
1158    ctx->API = api;
1159    ctx->DrawBuffer = NULL;
1160    ctx->ReadBuffer = NULL;
1161    ctx->WinSysDrawBuffer = NULL;
1162    ctx->WinSysReadBuffer = NULL;
1163
1164    if (visual) {
1165       ctx->Visual = *visual;
1166       ctx->HasConfig = GL_TRUE;
1167    }
1168    else {
1169       memset(&ctx->Visual, 0, sizeof ctx->Visual);
1170       ctx->HasConfig = GL_FALSE;
1171    }
1172
1173    _mesa_override_gl_version(ctx);
1174
1175    /* misc one-time initializations */
1176    one_time_init(ctx);
1177
1178    /* Plug in driver functions and context pointer here.
1179     * This is important because when we call alloc_shared_state() below
1180     * we'll call ctx->Driver.NewTextureObject() to create the default
1181     * textures.
1182     */
1183    ctx->Driver = *driverFunctions;
1184
1185    if (share_list) {
1186       /* share state with another context */
1187       shared = share_list->Shared;
1188    }
1189    else {
1190       /* allocate new, unshared state */
1191       shared = _mesa_alloc_shared_state(ctx);
1192       if (!shared)
1193          return GL_FALSE;
1194    }
1195
1196    _mesa_reference_shared_state(ctx, &ctx->Shared, shared);
1197
1198    if (!init_attrib_groups( ctx ))
1199       goto fail;
1200
1201    /* setup the API dispatch tables with all nop functions */
1202    ctx->OutsideBeginEnd = alloc_dispatch_table();
1203    if (!ctx->OutsideBeginEnd)
1204       goto fail;
1205    ctx->Exec = ctx->OutsideBeginEnd;
1206    ctx->CurrentDispatch = ctx->OutsideBeginEnd;
1207
1208    ctx->FragmentProgram._MaintainTexEnvProgram
1209       = (getenv("MESA_TEX_PROG") != NULL);
1210
1211    ctx->VertexProgram._MaintainTnlProgram
1212       = (getenv("MESA_TNL_PROG") != NULL);
1213    if (ctx->VertexProgram._MaintainTnlProgram) {
1214       /* this is required... */
1215       ctx->FragmentProgram._MaintainTexEnvProgram = GL_TRUE;
1216    }
1217
1218    /* Mesa core handles all the formats that mesa core knows about.
1219     * Drivers will want to override this list with just the formats
1220     * they can handle, and confirm that appropriate fallbacks exist in
1221     * _mesa_choose_tex_format().
1222     */
1223    memset(&ctx->TextureFormatSupported, GL_TRUE,
1224           sizeof(ctx->TextureFormatSupported));
1225
1226    switch (ctx->API) {
1227    case API_OPENGL_COMPAT:
1228       ctx->BeginEnd = create_beginend_table(ctx);
1229       ctx->Save = alloc_dispatch_table();
1230       if (!ctx->BeginEnd || !ctx->Save)
1231          goto fail;
1232
1233       /* fall-through */
1234    case API_OPENGL_CORE:
1235       break;
1236    case API_OPENGLES:
1237       /**
1238        * GL_OES_texture_cube_map says
1239        * "Initially all texture generation modes are set to REFLECTION_MAP_OES"
1240        */
1241       for (i = 0; i < MAX_TEXTURE_UNITS; i++) {
1242          struct gl_texture_unit *texUnit = &ctx->Texture.Unit[i];
1243          texUnit->GenS.Mode = GL_REFLECTION_MAP_NV;
1244          texUnit->GenT.Mode = GL_REFLECTION_MAP_NV;
1245          texUnit->GenR.Mode = GL_REFLECTION_MAP_NV;
1246          texUnit->GenS._ModeBit = TEXGEN_REFLECTION_MAP_NV;
1247          texUnit->GenT._ModeBit = TEXGEN_REFLECTION_MAP_NV;
1248          texUnit->GenR._ModeBit = TEXGEN_REFLECTION_MAP_NV;
1249       }
1250       break;
1251    case API_OPENGLES2:
1252       ctx->FragmentProgram._MaintainTexEnvProgram = GL_TRUE;
1253       ctx->VertexProgram._MaintainTnlProgram = GL_TRUE;
1254       break;
1255    }
1256
1257    ctx->FirstTimeCurrent = GL_TRUE;
1258
1259    return GL_TRUE;
1260
1261 fail:
1262    _mesa_reference_shared_state(ctx, &ctx->Shared, NULL);
1263    free(ctx->BeginEnd);
1264    free(ctx->OutsideBeginEnd);
1265    free(ctx->Save);
1266    return GL_FALSE;
1267 }
1268
1269
1270 /**
1271  * Allocate and initialize a struct gl_context structure.
1272  * Note that the driver needs to pass in its dd_function_table here since
1273  * we need to at least call driverFunctions->NewTextureObject to initialize
1274  * the rendering context.
1275  *
1276  * \param api the GL API type to create the context for
1277  * \param visual a struct gl_config pointer (we copy the struct contents) or
1278  *               NULL to create a configless context
1279  * \param share_list another context to share display lists with or NULL
1280  * \param driverFunctions points to the dd_function_table into which the
1281  *        driver has plugged in all its special functions.
1282  *
1283  * \return pointer to a new __struct gl_contextRec or NULL if error.
1284  */
1285 struct gl_context *
1286 _mesa_create_context(gl_api api,
1287                      const struct gl_config *visual,
1288                      struct gl_context *share_list,
1289                      const struct dd_function_table *driverFunctions)
1290 {
1291    struct gl_context *ctx;
1292
1293    ctx = calloc(1, sizeof(struct gl_context));
1294    if (!ctx)
1295       return NULL;
1296
1297    if (_mesa_initialize_context(ctx, api, visual, share_list,
1298                                 driverFunctions)) {
1299       return ctx;
1300    }
1301    else {
1302       free(ctx);
1303       return NULL;
1304    }
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_vertprog(ctx, &ctx->VertexProgram.Current, NULL);
1332    _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current, NULL);
1333    _mesa_reference_vertprog(ctx, &ctx->VertexProgram._TnlProgram, NULL);
1334
1335    _mesa_reference_tesscprog(ctx, &ctx->TessCtrlProgram._Current, NULL);
1336    _mesa_reference_tesseprog(ctx, &ctx->TessEvalProgram._Current, NULL);
1337    _mesa_reference_geomprog(ctx, &ctx->GeometryProgram._Current, NULL);
1338
1339    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram.Current, NULL);
1340    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current, NULL);
1341    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram, NULL);
1342
1343    _mesa_reference_vao(ctx, &ctx->Array.VAO, NULL);
1344    _mesa_reference_vao(ctx, &ctx->Array.DefaultVAO, NULL);
1345
1346    _mesa_free_attrib_data(ctx);
1347    _mesa_free_buffer_objects(ctx);
1348    _mesa_free_eval_data( ctx );
1349    _mesa_free_texture_data( ctx );
1350    _mesa_free_matrix_data( ctx );
1351    _mesa_free_pipeline_data(ctx);
1352    _mesa_free_program_data(ctx);
1353    _mesa_free_shader_state(ctx);
1354    _mesa_free_queryobj_data(ctx);
1355    _mesa_free_sync_data(ctx);
1356    _mesa_free_varray_data(ctx);
1357    _mesa_free_transform_feedback(ctx);
1358    _mesa_free_performance_monitors(ctx);
1359
1360    _mesa_reference_buffer_object(ctx, &ctx->Pack.BufferObj, NULL);
1361    _mesa_reference_buffer_object(ctx, &ctx->Unpack.BufferObj, NULL);
1362    _mesa_reference_buffer_object(ctx, &ctx->DefaultPacking.BufferObj, NULL);
1363    _mesa_reference_buffer_object(ctx, &ctx->Array.ArrayBufferObj, NULL);
1364
1365    /* free dispatch tables */
1366    free(ctx->BeginEnd);
1367    free(ctx->OutsideBeginEnd);
1368    free(ctx->Save);
1369
1370    /* Shared context state (display lists, textures, etc) */
1371    _mesa_reference_shared_state(ctx, &ctx->Shared, NULL);
1372
1373    /* needs to be after freeing shared state */
1374    _mesa_free_display_list_data(ctx);
1375
1376    _mesa_free_errors_data(ctx);
1377
1378    free((void *)ctx->Extensions.String);
1379
1380    free(ctx->VersionString);
1381
1382    /* unbind the context if it's currently bound */
1383    if (ctx == _mesa_get_current_context()) {
1384       _mesa_make_current(NULL, NULL, NULL);
1385    }
1386 }
1387
1388
1389 /**
1390  * Destroy a struct gl_context structure.
1391  *
1392  * \param ctx GL context.
1393  *
1394  * Calls _mesa_free_context_data() and frees the gl_context object itself.
1395  */
1396 void
1397 _mesa_destroy_context( struct gl_context *ctx )
1398 {
1399    if (ctx) {
1400       _mesa_free_context_data(ctx);
1401       free( (void *) ctx );
1402    }
1403 }
1404
1405
1406 /**
1407  * Copy attribute groups from one context to another.
1408  *
1409  * \param src source context
1410  * \param dst destination context
1411  * \param mask bitwise OR of GL_*_BIT flags
1412  *
1413  * According to the bits specified in \p mask, copies the corresponding
1414  * attributes from \p src into \p dst.  For many of the attributes a simple \c
1415  * memcpy is not enough due to the existence of internal pointers in their data
1416  * structures.
1417  */
1418 void
1419 _mesa_copy_context( const struct gl_context *src, struct gl_context *dst,
1420                     GLuint mask )
1421 {
1422    if (mask & GL_ACCUM_BUFFER_BIT) {
1423       /* OK to memcpy */
1424       dst->Accum = src->Accum;
1425    }
1426    if (mask & GL_COLOR_BUFFER_BIT) {
1427       /* OK to memcpy */
1428       dst->Color = src->Color;
1429    }
1430    if (mask & GL_CURRENT_BIT) {
1431       /* OK to memcpy */
1432       dst->Current = src->Current;
1433    }
1434    if (mask & GL_DEPTH_BUFFER_BIT) {
1435       /* OK to memcpy */
1436       dst->Depth = src->Depth;
1437    }
1438    if (mask & GL_ENABLE_BIT) {
1439       /* no op */
1440    }
1441    if (mask & GL_EVAL_BIT) {
1442       /* OK to memcpy */
1443       dst->Eval = src->Eval;
1444    }
1445    if (mask & GL_FOG_BIT) {
1446       /* OK to memcpy */
1447       dst->Fog = src->Fog;
1448    }
1449    if (mask & GL_HINT_BIT) {
1450       /* OK to memcpy */
1451       dst->Hint = src->Hint;
1452    }
1453    if (mask & GL_LIGHTING_BIT) {
1454       GLuint i;
1455       /* begin with memcpy */
1456       dst->Light = src->Light;
1457       /* fixup linked lists to prevent pointer insanity */
1458       make_empty_list( &(dst->Light.EnabledList) );
1459       for (i = 0; i < MAX_LIGHTS; i++) {
1460          if (dst->Light.Light[i].Enabled) {
1461             insert_at_tail(&(dst->Light.EnabledList), &(dst->Light.Light[i]));
1462          }
1463       }
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 void
1563 _mesa_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 static void
1584 handle_first_current(struct gl_context *ctx)
1585 {
1586    if (ctx->Version == 0) {
1587       /* probably in the process of tearing down the context */
1588       return;
1589    }
1590
1591    ctx->Extensions.String = _mesa_make_extension_string(ctx);
1592
1593    check_context_limits(ctx);
1594
1595    /* According to GL_MESA_configless_context the default value of
1596     * glDrawBuffers depends on the config of the first surface it is bound to.
1597     * For GLES it is always GL_BACK which has a magic interpretation */
1598    if (!ctx->HasConfig && _mesa_is_desktop_gl(ctx)) {
1599       if (ctx->DrawBuffer != _mesa_get_incomplete_framebuffer()) {
1600          GLenum buffer;
1601
1602          if (ctx->DrawBuffer->Visual.doubleBufferMode)
1603             buffer = GL_BACK;
1604          else
1605             buffer = GL_FRONT;
1606
1607          _mesa_drawbuffers(ctx, ctx->DrawBuffer, 1, &buffer,
1608                            NULL /* destMask */);
1609       }
1610
1611       if (ctx->ReadBuffer != _mesa_get_incomplete_framebuffer()) {
1612          gl_buffer_index bufferIndex;
1613          GLenum buffer;
1614
1615          if (ctx->ReadBuffer->Visual.doubleBufferMode) {
1616             buffer = GL_BACK;
1617             bufferIndex = BUFFER_BACK_LEFT;
1618          }
1619          else {
1620             buffer = GL_FRONT;
1621             bufferIndex = BUFFER_FRONT_LEFT;
1622          }
1623
1624          _mesa_readbuffer(ctx, ctx->ReadBuffer, buffer, bufferIndex);
1625       }
1626    }
1627
1628    /* We can use this to help debug user's problems.  Tell them to set
1629     * the MESA_INFO env variable before running their app.  Then the
1630     * first time each context is made current we'll print some useful
1631     * information.
1632     */
1633    if (getenv("MESA_INFO")) {
1634       _mesa_print_info(ctx);
1635    }
1636 }
1637
1638 /**
1639  * Bind the given context to the given drawBuffer and readBuffer and
1640  * make it the current context for the calling thread.
1641  * We'll render into the drawBuffer and read pixels from the
1642  * readBuffer (i.e. glRead/CopyPixels, glCopyTexImage, etc).
1643  *
1644  * We check that the context's and framebuffer's visuals are compatible
1645  * and return immediately if they're not.
1646  *
1647  * \param newCtx  the new GL context. If NULL then there will be no current GL
1648  *                context.
1649  * \param drawBuffer  the drawing framebuffer
1650  * \param readBuffer  the reading framebuffer
1651  */
1652 GLboolean
1653 _mesa_make_current( struct gl_context *newCtx,
1654                     struct gl_framebuffer *drawBuffer,
1655                     struct gl_framebuffer *readBuffer )
1656 {
1657    GET_CURRENT_CONTEXT(curCtx);
1658
1659    if (MESA_VERBOSE & VERBOSE_API)
1660       _mesa_debug(newCtx, "_mesa_make_current()\n");
1661
1662    /* Check that the context's and framebuffer's visuals are compatible.
1663     */
1664    if (newCtx && drawBuffer && newCtx->WinSysDrawBuffer != drawBuffer) {
1665       if (!check_compatible(newCtx, drawBuffer)) {
1666          _mesa_warning(newCtx,
1667               "MakeCurrent: incompatible visuals for context and drawbuffer");
1668          return GL_FALSE;
1669       }
1670    }
1671    if (newCtx && readBuffer && newCtx->WinSysReadBuffer != readBuffer) {
1672       if (!check_compatible(newCtx, readBuffer)) {
1673          _mesa_warning(newCtx,
1674               "MakeCurrent: incompatible visuals for context and readbuffer");
1675          return GL_FALSE;
1676       }
1677    }
1678
1679    if (curCtx &&
1680        (curCtx->WinSysDrawBuffer || curCtx->WinSysReadBuffer) &&
1681        /* make sure this context is valid for flushing */
1682        curCtx != newCtx &&
1683        curCtx->Const.ContextReleaseBehavior ==
1684        GL_CONTEXT_RELEASE_BEHAVIOR_FLUSH)
1685       _mesa_flush(curCtx);
1686
1687    /* We used to call _glapi_check_multithread() here.  Now do it in drivers */
1688    _glapi_set_context((void *) newCtx);
1689    assert(_mesa_get_current_context() == newCtx);
1690
1691    if (!newCtx) {
1692       _glapi_set_dispatch(NULL);  /* none current */
1693    }
1694    else {
1695       _glapi_set_dispatch(newCtx->CurrentDispatch);
1696
1697       if (drawBuffer && readBuffer) {
1698          assert(_mesa_is_winsys_fbo(drawBuffer));
1699          assert(_mesa_is_winsys_fbo(readBuffer));
1700          _mesa_reference_framebuffer(&newCtx->WinSysDrawBuffer, drawBuffer);
1701          _mesa_reference_framebuffer(&newCtx->WinSysReadBuffer, readBuffer);
1702
1703          /*
1704           * Only set the context's Draw/ReadBuffer fields if they're NULL
1705           * or not bound to a user-created FBO.
1706           */
1707          if (!newCtx->DrawBuffer || _mesa_is_winsys_fbo(newCtx->DrawBuffer)) {
1708             _mesa_reference_framebuffer(&newCtx->DrawBuffer, drawBuffer);
1709             /* Update the FBO's list of drawbuffers/renderbuffers.
1710              * For winsys FBOs this comes from the GL state (which may have
1711              * changed since the last time this FBO was bound).
1712              */
1713             _mesa_update_draw_buffers(newCtx);
1714          }
1715          if (!newCtx->ReadBuffer || _mesa_is_winsys_fbo(newCtx->ReadBuffer)) {
1716             _mesa_reference_framebuffer(&newCtx->ReadBuffer, readBuffer);
1717          }
1718
1719          /* XXX only set this flag if we're really changing the draw/read
1720           * framebuffer bindings.
1721           */
1722          newCtx->NewState |= _NEW_BUFFERS;
1723
1724          if (drawBuffer) {
1725             _mesa_check_init_viewport(newCtx,
1726                                       drawBuffer->Width, drawBuffer->Height);
1727          }
1728       }
1729
1730       if (newCtx->FirstTimeCurrent) {
1731          handle_first_current(newCtx);
1732          newCtx->FirstTimeCurrent = GL_FALSE;
1733       }
1734    }
1735
1736    return GL_TRUE;
1737 }
1738
1739
1740 /**
1741  * Make context 'ctx' share the display lists, textures and programs
1742  * that are associated with 'ctxToShare'.
1743  * Any display lists, textures or programs associated with 'ctx' will
1744  * be deleted if nobody else is sharing them.
1745  */
1746 GLboolean
1747 _mesa_share_state(struct gl_context *ctx, struct gl_context *ctxToShare)
1748 {
1749    if (ctx && ctxToShare && ctx->Shared && ctxToShare->Shared) {
1750       struct gl_shared_state *oldShared = NULL;
1751
1752       /* save ref to old state to prevent it from being deleted immediately */
1753       _mesa_reference_shared_state(ctx, &oldShared, ctx->Shared);
1754
1755       /* update ctx's Shared pointer */
1756       _mesa_reference_shared_state(ctx, &ctx->Shared, ctxToShare->Shared);
1757
1758       update_default_objects(ctx);
1759
1760       /* release the old shared state */
1761       _mesa_reference_shared_state(ctx, &oldShared, NULL);
1762
1763       return GL_TRUE;
1764    }
1765    else {
1766       return GL_FALSE;
1767    }
1768 }
1769
1770
1771
1772 /**
1773  * \return pointer to the current GL context for this thread.
1774  *
1775  * Calls _glapi_get_context(). This isn't the fastest way to get the current
1776  * context.  If you need speed, see the #GET_CURRENT_CONTEXT macro in
1777  * context.h.
1778  */
1779 struct gl_context *
1780 _mesa_get_current_context( void )
1781 {
1782    return (struct gl_context *) _glapi_get_context();
1783 }
1784
1785
1786 /**
1787  * Get context's current API dispatch table.
1788  *
1789  * It'll either be the immediate-mode execute dispatcher or the display list
1790  * compile dispatcher.
1791  *
1792  * \param ctx GL context.
1793  *
1794  * \return pointer to dispatch_table.
1795  *
1796  * Simply returns __struct gl_contextRec::CurrentDispatch.
1797  */
1798 struct _glapi_table *
1799 _mesa_get_dispatch(struct gl_context *ctx)
1800 {
1801    return ctx->CurrentDispatch;
1802 }
1803
1804 /*@}*/
1805
1806
1807 /**********************************************************************/
1808 /** \name Miscellaneous functions                                     */
1809 /**********************************************************************/
1810 /*@{*/
1811
1812 /**
1813  * Record an error.
1814  *
1815  * \param ctx GL context.
1816  * \param error error code.
1817  *
1818  * Records the given error code and call the driver's dd_function_table::Error
1819  * function if defined.
1820  *
1821  * \sa
1822  * This is called via _mesa_error().
1823  */
1824 void
1825 _mesa_record_error(struct gl_context *ctx, GLenum error)
1826 {
1827    if (!ctx)
1828       return;
1829
1830    if (ctx->ErrorValue == GL_NO_ERROR) {
1831       ctx->ErrorValue = error;
1832    }
1833 }
1834
1835
1836 /**
1837  * Flush commands and wait for completion.
1838  */
1839 void
1840 _mesa_finish(struct gl_context *ctx)
1841 {
1842    FLUSH_VERTICES( ctx, 0 );
1843    FLUSH_CURRENT( ctx, 0 );
1844    if (ctx->Driver.Finish) {
1845       ctx->Driver.Finish(ctx);
1846    }
1847 }
1848
1849
1850 /**
1851  * Flush commands.
1852  */
1853 void
1854 _mesa_flush(struct gl_context *ctx)
1855 {
1856    FLUSH_VERTICES( ctx, 0 );
1857    FLUSH_CURRENT( ctx, 0 );
1858    if (ctx->Driver.Flush) {
1859       ctx->Driver.Flush(ctx);
1860    }
1861 }
1862
1863
1864
1865 /**
1866  * Execute glFinish().
1867  *
1868  * Calls the #ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH macro and the
1869  * dd_function_table::Finish driver callback, if not NULL.
1870  */
1871 void GLAPIENTRY
1872 _mesa_Finish(void)
1873 {
1874    GET_CURRENT_CONTEXT(ctx);
1875    ASSERT_OUTSIDE_BEGIN_END(ctx);
1876    _mesa_finish(ctx);
1877 }
1878
1879
1880 /**
1881  * Execute glFlush().
1882  *
1883  * Calls the #ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH macro and the
1884  * dd_function_table::Flush driver callback, if not NULL.
1885  */
1886 void GLAPIENTRY
1887 _mesa_Flush(void)
1888 {
1889    GET_CURRENT_CONTEXT(ctx);
1890    ASSERT_OUTSIDE_BEGIN_END(ctx);
1891    _mesa_flush(ctx);
1892 }
1893
1894
1895 /*
1896  * ARB_blend_func_extended - ERRORS section
1897  * "The error INVALID_OPERATION is generated by Begin or any procedure that
1898  *  implicitly calls Begin if any draw buffer has a blend function requiring the
1899  *  second color input (SRC1_COLOR, ONE_MINUS_SRC1_COLOR, SRC1_ALPHA or
1900  *  ONE_MINUS_SRC1_ALPHA), and a framebuffer is bound that has more than
1901  *  the value of MAX_DUAL_SOURCE_DRAW_BUFFERS-1 active color attachements."
1902  */
1903 static GLboolean
1904 _mesa_check_blend_func_error(struct gl_context *ctx)
1905 {
1906    GLuint i;
1907    for (i = ctx->Const.MaxDualSourceDrawBuffers;
1908         i < ctx->DrawBuffer->_NumColorDrawBuffers;
1909         i++) {
1910       if (ctx->Color.Blend[i]._UsesDualSrc) {
1911          _mesa_error(ctx, GL_INVALID_OPERATION,
1912                      "dual source blend on illegal attachment");
1913          return GL_FALSE;
1914       }
1915    }
1916    return GL_TRUE;
1917 }
1918
1919
1920 /**
1921  * Prior to drawing anything with glBegin, glDrawArrays, etc. this function
1922  * is called to see if it's valid to render.  This involves checking that
1923  * the current shader is valid and the framebuffer is complete.
1924  * It also check the current pipeline object is valid if any.
1925  * If an error is detected it'll be recorded here.
1926  * \return GL_TRUE if OK to render, GL_FALSE if not
1927  */
1928 GLboolean
1929 _mesa_valid_to_render(struct gl_context *ctx, const char *where)
1930 {
1931    /* This depends on having up to date derived state (shaders) */
1932    if (ctx->NewState)
1933       _mesa_update_state(ctx);
1934
1935    if (ctx->API == API_OPENGL_COMPAT) {
1936       /* Any shader stages that are not supplied by the GLSL shader and have
1937        * assembly shaders enabled must now be validated.
1938        */
1939       if (!ctx->_Shader->CurrentProgram[MESA_SHADER_VERTEX]
1940           && ctx->VertexProgram.Enabled && !ctx->VertexProgram._Enabled) {
1941          _mesa_error(ctx, GL_INVALID_OPERATION,
1942                      "%s(vertex program not valid)", where);
1943          return GL_FALSE;
1944       }
1945
1946       if (!ctx->_Shader->CurrentProgram[MESA_SHADER_FRAGMENT]) {
1947          if (ctx->FragmentProgram.Enabled && !ctx->FragmentProgram._Enabled) {
1948             _mesa_error(ctx, GL_INVALID_OPERATION,
1949                         "%s(fragment program not valid)", where);
1950             return GL_FALSE;
1951          }
1952
1953          /* If drawing to integer-valued color buffers, there must be an
1954           * active fragment shader (GL_EXT_texture_integer).
1955           */
1956          if (ctx->DrawBuffer && ctx->DrawBuffer->_IntegerColor) {
1957             _mesa_error(ctx, GL_INVALID_OPERATION,
1958                         "%s(integer format but no fragment shader)", where);
1959             return GL_FALSE;
1960          }
1961       }
1962    }
1963
1964    /* A pipeline object is bound */
1965    if (ctx->_Shader->Name && !ctx->_Shader->Validated) {
1966       if (!_mesa_validate_program_pipeline(ctx, ctx->_Shader)) {
1967          _mesa_error(ctx, GL_INVALID_OPERATION,
1968                      "glValidateProgramPipeline failed to validate the "
1969                      "pipeline");
1970          return GL_FALSE;
1971       }
1972    }
1973
1974    /* If a program is active and SSO not in use, check if validation of
1975     * samplers succeeded for the active program. */
1976    if (ctx->_Shader->ActiveProgram && ctx->_Shader != ctx->Pipeline.Current) {
1977       char errMsg[100];
1978       if (!_mesa_sampler_uniforms_are_valid(ctx->_Shader->ActiveProgram,
1979                                             errMsg, 100)) {
1980          _mesa_error(ctx, GL_INVALID_OPERATION, "%s", errMsg);
1981          return GL_FALSE;
1982       }
1983    }
1984
1985    if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
1986       _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
1987                   "%s(incomplete framebuffer)", where);
1988       return GL_FALSE;
1989    }
1990
1991    if (_mesa_check_blend_func_error(ctx) == GL_FALSE) {
1992       return GL_FALSE;
1993    }
1994
1995 #ifdef DEBUG
1996    if (ctx->_Shader->Flags & GLSL_LOG) {
1997       struct gl_shader_program **shProg = ctx->_Shader->CurrentProgram;
1998       gl_shader_stage i;
1999
2000       for (i = 0; i < MESA_SHADER_STAGES; i++) {
2001          if (shProg[i] == NULL || shProg[i]->_Used
2002              || shProg[i]->_LinkedShaders[i] == NULL)
2003             continue;
2004
2005          /* This is the first time this shader is being used.
2006           * Append shader's constants/uniforms to log file.
2007           *
2008           * Only log data for the program target that matches the shader
2009           * target.  It's possible to have a program bound to the vertex
2010           * shader target that also supplied a fragment shader.  If that
2011           * program isn't also bound to the fragment shader target we don't
2012           * want to log its fragment data.
2013           */
2014          _mesa_append_uniforms_to_file(shProg[i]->_LinkedShaders[i]);
2015       }
2016
2017       for (i = 0; i < MESA_SHADER_STAGES; i++) {
2018          if (shProg[i] != NULL)
2019             shProg[i]->_Used = GL_TRUE;
2020       }
2021    }
2022 #endif
2023
2024    return GL_TRUE;
2025 }
2026
2027
2028 /*@}*/