src/mesa/main/context.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.3
   4  *
   5  * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
   6  * Copyright (C) 2008  VMware, Inc.  All Rights Reserved.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a
   9  * copy of this software and associated documentation files (the "Software"),
  10  * to deal in the Software without restriction, including without limitation
  11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12  * and/or sell copies of the Software, and to permit persons to whom the
  13  * Software is furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included
  16  * in all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  21  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  22  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  23  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26 /**
  27  * \file context.c
  28  * Mesa context/visual/framebuffer management functions.
  29  * \author Brian Paul
  30  */
  31
  32 /**
  33  * \mainpage Mesa Main Module
  34  *
  35  * \section MainIntroduction Introduction
  36  *
  37  * The Mesa Main module consists of all the files in the main/ directory.
  38  * Among the features of this module are:
  39  * <UL>
  40  * <LI> Structures to represent most GL state </LI>
  41  * <LI> State set/get functions </LI>
  42  * <LI> Display lists </LI>
  43  * <LI> Texture unit, object and image handling </LI>
  44  * <LI> Matrix and attribute stacks </LI>
  45  * </UL>
  46  *
  47  * Other modules are responsible for API dispatch, vertex transformation,
  48  * point/line/triangle setup, rasterization, vertex array caching,
  49  * vertex/fragment programs/shaders, etc.
  50  *
  51  *
  52  * \section AboutDoxygen About Doxygen
  53  *
  54  * If you're viewing this information as Doxygen-generated HTML you'll
  55  * see the documentation index at the top of this page.
  56  *
  57  * The first line lists the Mesa source code modules.
  58  * The second line lists the indexes available for viewing the documentation
  59  * for each module.
  60  *
  61  * Selecting the <b>Main page</b> link will display a summary of the module
  62  * (this page).
  63  *
  64  * Selecting <b>Data Structures</b> will list all C structures.
  65  *
  66  * Selecting the <b>File List</b> link will list all the source files in
  67  * the module.
  68  * Selecting a filename will show a list of all functions defined in that file.
  69  *
  70  * Selecting the <b>Data Fields</b> link will display a list of all
  71  * documented structure members.
  72  *
  73  * Selecting the <b>Globals</b> link will display a list
  74  * of all functions, structures, global variables and macros in the module.
  75  *
  76  */
  77
  78
  79 #include "glheader.h"
  80 #include "mfeatures.h"
  81 #include "imports.h"
  82 #include "accum.h"
  83 #include "api_exec.h"
  84 #include "arrayobj.h"
  85 #include "attrib.h"
  86 #include "blend.h"
  87 #include "buffers.h"
  88 #include "bufferobj.h"
  89 #include "colortab.h"
  90 #include "context.h"
  91 #include "cpuinfo.h"
  92 #include "debug.h"
  93 #include "depth.h"
  94 #include "dlist.h"
  95 #include "eval.h"
  96 #include "extensions.h"
  97 #include "fbobject.h"
  98 #include "feedback.h"
  99 #include "fog.h"
 100 #include "framebuffer.h"
 101 #include "histogram.h"
 102 #include "hint.h"
 103 #include "hash.h"
 104 #include "light.h"
 105 #include "lines.h"
 106 #include "macros.h"
 107 #include "matrix.h"
 108 #include "multisample.h"
 109 #include "pixel.h"
 110 #include "pixelstore.h"
 111 #include "points.h"
 112 #include "polygon.h"
 113 #include "queryobj.h"
 114 #if FEATURE_ARB_sync
 115 #include "syncobj.h"
 116 #endif
 117 #include "rastpos.h"
 118 #include "remap.h"
 119 #include "scissor.h"
 120 #include "shared.h"
 121 #include "simple_list.h"
 122 #include "state.h"
 123 #include "stencil.h"
 124 #include "texcompress_s3tc.h"
 125 #include "texstate.h"
 126 #include "transformfeedback.h"
 127 #include "mtypes.h"
 128 #include "varray.h"
 129 #include "version.h"
 130 #include "viewport.h"
 131 #include "vtxfmt.h"
 132 #include "glapi/glthread.h"
 133 #include "glapi/glapitable.h"
 134 #include "shader/program.h"
 135 #include "shader/prog_print.h"
 136 #include "shader/shader_api.h"
 137 #if _HAVE_FULL_GL
 138 #include "math/m_matrix.h"
 139 #endif
 140
 141 #ifdef USE_SPARC_ASM
 142 #include "sparc/sparc.h"
 143 #endif
 144
 145 #ifndef MESA_VERBOSE
 146 int MESA_VERBOSE = 0;
 147 #endif
 148
 149 #ifndef MESA_DEBUG_FLAGS
 150 int MESA_DEBUG_FLAGS = 0;
 151 #endif
 152
 153
 154 /* ubyte -> float conversion */
 155 GLfloat _mesa_ubyte_to_float_color_tab[256];
 156
 157
 158
 159 /**
 160  * Swap buffers notification callback.
 161  *
 162  * \param ctx GL context.
 163  *
 164  * Called by window system just before swapping buffers.
 165  * We have to finish any pending rendering.
 166  */
 167 void
 168 _mesa_notifySwapBuffers(__GLcontext *ctx)
 169 {
 170    if (MESA_VERBOSE & VERBOSE_SWAPBUFFERS)
 171       _mesa_debug(ctx, "SwapBuffers\n");
 172    FLUSH_CURRENT( ctx, 0 );
 173    if (ctx->Driver.Flush) {
 174       ctx->Driver.Flush(ctx);
 175    }
 176 }
 177
 178
 179 /**********************************************************************/
 180 /** \name GL Visual allocation/destruction                            */
 181 /**********************************************************************/
 182 /*@{*/
 183
 184 /**
 185  * Allocates a GLvisual structure and initializes it via
 186  * _mesa_initialize_visual().
 187  *
 188  * \param dbFlag double buffering
 189  * \param stereoFlag stereo buffer
 190  * \param depthBits requested bits per depth buffer value. Any value in [0, 32]
 191  * is acceptable but the actual depth type will be GLushort or GLuint as
 192  * needed.
 193  * \param stencilBits requested minimum bits per stencil buffer value
 194  * \param accumRedBits, accumGreenBits, accumBlueBits, accumAlphaBits number of bits per color component in accum buffer.
 195  * \param indexBits number of bits per pixel if \p rgbFlag is GL_FALSE
 196  * \param redBits number of bits per color component in frame buffer for RGB(A)
 197  * mode.  We always use 8 in core Mesa though.
 198  * \param greenBits same as above.
 199  * \param blueBits same as above.
 200  * \param alphaBits same as above.
 201  * \param numSamples not really used.
 202  *
 203  * \return pointer to new GLvisual or NULL if requested parameters can't be
 204  * met.
 205  *
 206  * \note Need to add params for level and numAuxBuffers (at least)
 207  */
 208 GLvisual *
 209 _mesa_create_visual( GLboolean dbFlag,
 210                      GLboolean stereoFlag,
 211                      GLint redBits,
 212                      GLint greenBits,
 213                      GLint blueBits,
 214                      GLint alphaBits,
 215                      GLint depthBits,
 216                      GLint stencilBits,
 217                      GLint accumRedBits,
 218                      GLint accumGreenBits,
 219                      GLint accumBlueBits,
 220                      GLint accumAlphaBits,
 221                      GLint numSamples )
 222 {
 223    GLvisual *vis = (GLvisual *) calloc(1, sizeof(GLvisual));
 224    if (vis) {
 225       if (!_mesa_initialize_visual(vis, dbFlag, stereoFlag,
 226                                    redBits, greenBits, blueBits, alphaBits,
 227                                    depthBits, stencilBits,
 228                                    accumRedBits, accumGreenBits,
 229                                    accumBlueBits, accumAlphaBits,
 230                                    numSamples)) {
 231          free(vis);
 232          return NULL;
 233       }
 234    }
 235    return vis;
 236 }
 237
 238 /**
 239  * Makes some sanity checks and fills in the fields of the
 240  * GLvisual object with the given parameters.  If the caller needs
 241  * to set additional fields, he should just probably init the whole GLvisual
 242  * object himself.
 243  * \return GL_TRUE on success, or GL_FALSE on failure.
 244  *
 245  * \sa _mesa_create_visual() above for the parameter description.
 246  */
 247 GLboolean
 248 _mesa_initialize_visual( GLvisual *vis,
 249                          GLboolean dbFlag,
 250                          GLboolean stereoFlag,
 251                          GLint redBits,
 252                          GLint greenBits,
 253                          GLint blueBits,
 254                          GLint alphaBits,
 255                          GLint depthBits,
 256                          GLint stencilBits,
 257                          GLint accumRedBits,
 258                          GLint accumGreenBits,
 259                          GLint accumBlueBits,
 260                          GLint accumAlphaBits,
 261                          GLint numSamples )
 262 {
 263    assert(vis);
 264
 265    if (depthBits < 0 || depthBits > 32) {
 266       return GL_FALSE;
 267    }
 268    if (stencilBits < 0 || stencilBits > STENCIL_BITS) {
 269       return GL_FALSE;
 270    }
 271    assert(accumRedBits >= 0);
 272    assert(accumGreenBits >= 0);
 273    assert(accumBlueBits >= 0);
 274    assert(accumAlphaBits >= 0);
 275
 276    vis->rgbMode          = GL_TRUE;
 277    vis->doubleBufferMode = dbFlag;
 278    vis->stereoMode       = stereoFlag;
 279
 280    vis->redBits          = redBits;
 281    vis->greenBits        = greenBits;
 282    vis->blueBits         = blueBits;
 283    vis->alphaBits        = alphaBits;
 284    vis->rgbBits          = redBits + greenBits + blueBits;
 285
 286    vis->indexBits      = 0;
 287    vis->depthBits      = depthBits;
 288    vis->stencilBits    = stencilBits;
 289
 290    vis->accumRedBits   = accumRedBits;
 291    vis->accumGreenBits = accumGreenBits;
 292    vis->accumBlueBits  = accumBlueBits;
 293    vis->accumAlphaBits = accumAlphaBits;
 294
 295    vis->haveAccumBuffer   = accumRedBits > 0;
 296    vis->haveDepthBuffer   = depthBits > 0;
 297    vis->haveStencilBuffer = stencilBits > 0;
 298
 299    vis->numAuxBuffers = 0;
 300    vis->level = 0;
 301    vis->pixmapMode = 0;
 302    vis->sampleBuffers = numSamples > 0 ? 1 : 0;
 303    vis->samples = numSamples;
 304
 305    return GL_TRUE;
 306 }
 307
 308
 309 /**
 310  * Destroy a visual and free its memory.
 311  *
 312  * \param vis visual.
 313  *
 314  * Frees the visual structure.
 315  */
 316 void
 317 _mesa_destroy_visual( GLvisual *vis )
 318 {
 319    free(vis);
 320 }
 321
 322 /*@}*/
 323
 324
 325 /**********************************************************************/
 326 /** \name Context allocation, initialization, destroying
 327  *
 328  * The purpose of the most initialization functions here is to provide the
 329  * default state values according to the OpenGL specification.
 330  */
 331 /**********************************************************************/
 332 /*@{*/
 333
 334
 335 /**
 336  * This is lame.  gdb only seems to recognize enum types that are
 337  * actually used somewhere.  We want to be able to print/use enum
 338  * values such as TEXTURE_2D_INDEX in gdb.  But we don't actually use
 339  * the gl_texture_index type anywhere.  Thus, this lame function.
 340  */
 341 static void
 342 dummy_enum_func(void)
 343 {
 344    gl_buffer_index bi;
 345    gl_colortable_index ci;
 346    gl_face_index fi;
 347    gl_frag_attrib fa;
 348    gl_frag_result fr;
 349    gl_texture_index ti;
 350    gl_vert_attrib va;
 351    gl_vert_result vr;
 352
 353    (void) bi;
 354    (void) ci;
 355    (void) fi;
 356    (void) fa;
 357    (void) fr;
 358    (void) ti;
 359    (void) va;
 360    (void) vr;
 361 }
 362
 363
 364 /**
 365  * One-time initialization mutex lock.
 366  *
 367  * \sa Used by one_time_init().
 368  */
 369 _glthread_DECLARE_STATIC_MUTEX(OneTimeLock);
 370
 371 /**
 372  * Calls all the various one-time-init functions in Mesa.
 373  *
 374  * While holding a global mutex lock, calls several initialization functions,
 375  * and sets the glapi callbacks if the \c MESA_DEBUG environment variable is
 376  * defined.
 377  *
 378  * \sa _math_init().
 379  */
 380 static void
 381 one_time_init( GLcontext *ctx )
 382 {
 383    static GLboolean alreadyCalled = GL_FALSE;
 384    (void) ctx;
 385    _glthread_LOCK_MUTEX(OneTimeLock);
 386    if (!alreadyCalled) {
 387       GLuint i;
 388
 389       /* do some implementation tests */
 390       assert( sizeof(GLbyte) == 1 );
 391       assert( sizeof(GLubyte) == 1 );
 392       assert( sizeof(GLshort) == 2 );
 393       assert( sizeof(GLushort) == 2 );
 394       assert( sizeof(GLint) == 4 );
 395       assert( sizeof(GLuint) == 4 );
 396
 397       _mesa_get_cpu_features();
 398
 399       _mesa_init_remap_table();
 400
 401       _mesa_init_sqrt_table();
 402
 403       for (i = 0; i < 256; i++) {
 404          _mesa_ubyte_to_float_color_tab[i] = (float) i / 255.0F;
 405       }
 406
 407 #if defined(DEBUG) && defined(__DATE__) && defined(__TIME__)
 408       _mesa_debug(ctx, "Mesa %s DEBUG build %s %s\n",
 409                   MESA_VERSION_STRING, __DATE__, __TIME__);
 410 #endif
 411
 412       alreadyCalled = GL_TRUE;
 413    }
 414    _glthread_UNLOCK_MUTEX(OneTimeLock);
 415
 416    dummy_enum_func();
 417 }
 418
 419
 420 /**
 421  * Initialize fields of gl_current_attrib (aka ctx->Current.*)
 422  */
 423 static void
 424 _mesa_init_current(GLcontext *ctx)
 425 {
 426    GLuint i;
 427
 428    /* Init all to (0,0,0,1) */
 429    for (i = 0; i < Elements(ctx->Current.Attrib); i++) {
 430       ASSIGN_4V( ctx->Current.Attrib[i], 0.0, 0.0, 0.0, 1.0 );
 431    }
 432
 433    /* redo special cases: */
 434    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_WEIGHT], 1.0, 0.0, 0.0, 0.0 );
 435    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_NORMAL], 0.0, 0.0, 1.0, 1.0 );
 436    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_COLOR0], 1.0, 1.0, 1.0, 1.0 );
 437    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_COLOR1], 0.0, 0.0, 0.0, 1.0 );
 438    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_COLOR_INDEX], 1.0, 0.0, 0.0, 1.0 );
 439    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_EDGEFLAG], 1.0, 0.0, 0.0, 1.0 );
 440 }
 441
 442
 443 /**
 444  * Init vertex/fragment program limits.
 445  * Important: drivers should override these with actual limits.
 446  */
 447 static void
 448 init_program_limits(GLenum type, struct gl_program_constants *prog)
 449 {
 450    prog->MaxInstructions = MAX_PROGRAM_INSTRUCTIONS;
 451    prog->MaxAluInstructions = MAX_PROGRAM_INSTRUCTIONS;
 452    prog->MaxTexInstructions = MAX_PROGRAM_INSTRUCTIONS;
 453    prog->MaxTexIndirections = MAX_PROGRAM_INSTRUCTIONS;
 454    prog->MaxTemps = MAX_PROGRAM_TEMPS;
 455    prog->MaxEnvParams = MAX_PROGRAM_ENV_PARAMS;
 456    prog->MaxLocalParams = MAX_PROGRAM_LOCAL_PARAMS;
 457    prog->MaxUniformComponents = 4 * MAX_UNIFORMS;
 458
 459    if (type == GL_VERTEX_PROGRAM_ARB) {
 460       prog->MaxParameters = MAX_VERTEX_PROGRAM_PARAMS;
 461       prog->MaxAttribs = MAX_NV_VERTEX_PROGRAM_INPUTS;
 462       prog->MaxAddressRegs = MAX_VERTEX_PROGRAM_ADDRESS_REGS;
 463    }
 464    else {
 465       prog->MaxParameters = MAX_NV_FRAGMENT_PROGRAM_PARAMS;
 466       prog->MaxAttribs = MAX_NV_FRAGMENT_PROGRAM_INPUTS;
 467       prog->MaxAddressRegs = MAX_FRAGMENT_PROGRAM_ADDRESS_REGS;
 468    }
 469
 470    /* Set the native limits to zero.  This implies that there is no native
 471     * support for shaders.  Let the drivers fill in the actual values.
 472     */
 473    prog->MaxNativeInstructions = 0;
 474    prog->MaxNativeAluInstructions = 0;
 475    prog->MaxNativeTexInstructions = 0;
 476    prog->MaxNativeTexIndirections = 0;
 477    prog->MaxNativeAttribs = 0;
 478    prog->MaxNativeTemps = 0;
 479    prog->MaxNativeAddressRegs = 0;
 480    prog->MaxNativeParameters = 0;
 481 }
 482
 483
 484 /**
 485  * Initialize fields of gl_constants (aka ctx->Const.*).
 486  * Use defaults from config.h.  The device drivers will often override
 487  * some of these values (such as number of texture units).
 488  */
 489 static void
 490 _mesa_init_constants(GLcontext *ctx)
 491 {
 492    assert(ctx);
 493
 494    /* Constants, may be overriden (usually only reduced) by device drivers */
 495    ctx->Const.MaxTextureLevels = MAX_TEXTURE_LEVELS;
 496    ctx->Const.Max3DTextureLevels = MAX_3D_TEXTURE_LEVELS;
 497    ctx->Const.MaxCubeTextureLevels = MAX_CUBE_TEXTURE_LEVELS;
 498    ctx->Const.MaxTextureRectSize = MAX_TEXTURE_RECT_SIZE;
 499    ctx->Const.MaxArrayTextureLayers = MAX_ARRAY_TEXTURE_LAYERS;
 500    ctx->Const.MaxTextureCoordUnits = MAX_TEXTURE_COORD_UNITS;
 501    ctx->Const.MaxTextureImageUnits = MAX_TEXTURE_IMAGE_UNITS;
 502    ctx->Const.MaxTextureUnits = MIN2(ctx->Const.MaxTextureCoordUnits,
 503                                      ctx->Const.MaxTextureImageUnits);
 504    ctx->Const.MaxTextureMaxAnisotropy = MAX_TEXTURE_MAX_ANISOTROPY;
 505    ctx->Const.MaxTextureLodBias = MAX_TEXTURE_LOD_BIAS;
 506    ctx->Const.MaxArrayLockSize = MAX_ARRAY_LOCK_SIZE;
 507    ctx->Const.SubPixelBits = SUB_PIXEL_BITS;
 508    ctx->Const.MinPointSize = MIN_POINT_SIZE;
 509    ctx->Const.MaxPointSize = MAX_POINT_SIZE;
 510    ctx->Const.MinPointSizeAA = MIN_POINT_SIZE;
 511    ctx->Const.MaxPointSizeAA = MAX_POINT_SIZE;
 512    ctx->Const.PointSizeGranularity = (GLfloat) POINT_SIZE_GRANULARITY;
 513    ctx->Const.MinLineWidth = MIN_LINE_WIDTH;
 514    ctx->Const.MaxLineWidth = MAX_LINE_WIDTH;
 515    ctx->Const.MinLineWidthAA = MIN_LINE_WIDTH;
 516    ctx->Const.MaxLineWidthAA = MAX_LINE_WIDTH;
 517    ctx->Const.LineWidthGranularity = (GLfloat) LINE_WIDTH_GRANULARITY;
 518    ctx->Const.MaxColorTableSize = MAX_COLOR_TABLE_SIZE;
 519    ctx->Const.MaxConvolutionWidth = MAX_CONVOLUTION_WIDTH;
 520    ctx->Const.MaxConvolutionHeight = MAX_CONVOLUTION_HEIGHT;
 521    ctx->Const.MaxClipPlanes = MAX_CLIP_PLANES;
 522    ctx->Const.MaxLights = MAX_LIGHTS;
 523    ctx->Const.MaxShininess = 128.0;
 524    ctx->Const.MaxSpotExponent = 128.0;
 525    ctx->Const.MaxViewportWidth = MAX_WIDTH;
 526    ctx->Const.MaxViewportHeight = MAX_HEIGHT;
 527 #if FEATURE_ARB_vertex_program
 528    init_program_limits(GL_VERTEX_PROGRAM_ARB, &ctx->Const.VertexProgram);
 529 #endif
 530 #if FEATURE_ARB_fragment_program
 531    init_program_limits(GL_FRAGMENT_PROGRAM_ARB, &ctx->Const.FragmentProgram);
 532 #endif
 533    ctx->Const.MaxProgramMatrices = MAX_PROGRAM_MATRICES;
 534    ctx->Const.MaxProgramMatrixStackDepth = MAX_PROGRAM_MATRIX_STACK_DEPTH;
 535
 536    /* CheckArrayBounds is overriden by drivers/x11 for X server */
 537    ctx->Const.CheckArrayBounds = GL_FALSE;
 538
 539    /* GL_ARB_draw_buffers */
 540    ctx->Const.MaxDrawBuffers = MAX_DRAW_BUFFERS;
 541
 542 #if FEATURE_EXT_framebuffer_object
 543    ctx->Const.MaxColorAttachments = MAX_COLOR_ATTACHMENTS;
 544    ctx->Const.MaxRenderbufferSize = MAX_WIDTH;
 545 #endif
 546
 547 #if FEATURE_ARB_vertex_shader
 548    ctx->Const.MaxVertexTextureImageUnits = MAX_VERTEX_TEXTURE_IMAGE_UNITS;
 549    ctx->Const.MaxCombinedTextureImageUnits = MAX_COMBINED_TEXTURE_IMAGE_UNITS;
 550    ctx->Const.MaxVarying = MAX_VARYING;
 551 #endif
 552
 553    /* GL_ARB_framebuffer_object */
 554    ctx->Const.MaxSamples = 0;
 555
 556    /* GL_ARB_sync */
 557    ctx->Const.MaxServerWaitTimeout = (GLuint64) ~0;
 558
 559    /* GL_ATI_envmap_bumpmap */
 560    ctx->Const.SupportedBumpUnits = SUPPORTED_ATI_BUMP_UNITS;
 561
 562    /* GL_EXT_provoking_vertex */
 563    ctx->Const.QuadsFollowProvokingVertexConvention = GL_TRUE;
 564
 565    /* GL_EXT_transform_feedback */
 566    ctx->Const.MaxTransformFeedbackSeparateAttribs = MAX_FEEDBACK_ATTRIBS;
 567    ctx->Const.MaxTransformFeedbackSeparateComponents = 4 * MAX_FEEDBACK_ATTRIBS;
 568    ctx->Const.MaxTransformFeedbackInterleavedComponents = 4 * MAX_FEEDBACK_ATTRIBS;
 569 }
 570
 571
 572 /**
 573  * Do some sanity checks on the limits/constants for the given context.
 574  * Only called the first time a context is bound.
 575  */
 576 static void
 577 check_context_limits(GLcontext *ctx)
 578 {
 579    /* check that we don't exceed the size of various bitfields */
 580    assert(VERT_RESULT_MAX <=
 581           (8 * sizeof(ctx->VertexProgram._Current->Base.OutputsWritten)));
 582    assert(FRAG_ATTRIB_MAX <=
 583           (8 * sizeof(ctx->FragmentProgram._Current->Base.InputsRead)));
 584
 585    assert(MAX_COMBINED_TEXTURE_IMAGE_UNITS <= 8 * sizeof(GLbitfield));
 586
 587    /* shader-related checks */
 588    assert(ctx->Const.FragmentProgram.MaxLocalParams <= MAX_PROGRAM_LOCAL_PARAMS);
 589    assert(ctx->Const.VertexProgram.MaxLocalParams <= MAX_PROGRAM_LOCAL_PARAMS);
 590
 591    assert(MAX_NV_FRAGMENT_PROGRAM_TEMPS <= MAX_PROGRAM_TEMPS);
 592    assert(MAX_NV_VERTEX_PROGRAM_TEMPS <= MAX_PROGRAM_TEMPS);
 593    assert(MAX_NV_VERTEX_PROGRAM_INPUTS <= VERT_ATTRIB_MAX);
 594    assert(MAX_NV_VERTEX_PROGRAM_OUTPUTS <= VERT_RESULT_MAX);
 595
 596    /* Texture unit checks */
 597    assert(ctx->Const.MaxTextureImageUnits > 0);
 598    assert(ctx->Const.MaxTextureImageUnits <= MAX_TEXTURE_IMAGE_UNITS);
 599    assert(ctx->Const.MaxTextureCoordUnits > 0);
 600    assert(ctx->Const.MaxTextureCoordUnits <= MAX_TEXTURE_COORD_UNITS);
 601    assert(ctx->Const.MaxTextureUnits > 0);
 602    assert(ctx->Const.MaxTextureUnits <= MAX_TEXTURE_IMAGE_UNITS);
 603    assert(ctx->Const.MaxTextureUnits <= MAX_TEXTURE_COORD_UNITS);
 604    assert(ctx->Const.MaxTextureUnits == MIN2(ctx->Const.MaxTextureImageUnits,
 605                                              ctx->Const.MaxTextureCoordUnits));
 606    assert(ctx->Const.MaxCombinedTextureImageUnits > 0);
 607    assert(ctx->Const.MaxCombinedTextureImageUnits <= MAX_COMBINED_TEXTURE_IMAGE_UNITS);
 608    assert(ctx->Const.MaxTextureCoordUnits <= MAX_COMBINED_TEXTURE_IMAGE_UNITS);
 609    /* number of coord units cannot be greater than number of image units */
 610    assert(ctx->Const.MaxTextureCoordUnits <= ctx->Const.MaxTextureImageUnits);
 611
 612
 613    /* Texture size checks */
 614    assert(ctx->Const.MaxTextureLevels <= MAX_TEXTURE_LEVELS);
 615    assert(ctx->Const.Max3DTextureLevels <= MAX_3D_TEXTURE_LEVELS);
 616    assert(ctx->Const.MaxCubeTextureLevels <= MAX_CUBE_TEXTURE_LEVELS);
 617    assert(ctx->Const.MaxTextureRectSize <= MAX_TEXTURE_RECT_SIZE);
 618
 619    /* make sure largest texture image is <= MAX_WIDTH in size */
 620    assert((1 << (ctx->Const.MaxTextureLevels - 1)) <= MAX_WIDTH);
 621    assert((1 << (ctx->Const.MaxCubeTextureLevels - 1)) <= MAX_WIDTH);
 622    assert((1 << (ctx->Const.Max3DTextureLevels - 1)) <= MAX_WIDTH);
 623
 624    /* Texture level checks */
 625    assert(MAX_TEXTURE_LEVELS >= MAX_3D_TEXTURE_LEVELS);
 626    assert(MAX_TEXTURE_LEVELS >= MAX_CUBE_TEXTURE_LEVELS);
 627
 628    /* Max texture size should be <= max viewport size (render to texture) */
 629    assert((1 << (MAX_TEXTURE_LEVELS - 1)) <= MAX_WIDTH);
 630
 631    assert(ctx->Const.MaxViewportWidth <= MAX_WIDTH);
 632    assert(ctx->Const.MaxViewportHeight <= MAX_WIDTH);
 633
 634    assert(ctx->Const.MaxDrawBuffers <= MAX_DRAW_BUFFERS);
 635
 636    /* XXX probably add more tests */
 637 }
 638
 639
 640 /**
 641  * Initialize the attribute groups in a GL context.
 642  *
 643  * \param ctx GL context.
 644  *
 645  * Initializes all the attributes, calling the respective <tt>init*</tt>
 646  * functions for the more complex data structures.
 647  */
 648 static GLboolean
 649 init_attrib_groups(GLcontext *ctx)
 650 {
 651    assert(ctx);
 652
 653    /* Constants */
 654    _mesa_init_constants( ctx );
 655
 656    /* Extensions */
 657    _mesa_init_extensions( ctx );
 658
 659    /* Attribute Groups */
 660    _mesa_init_accum( ctx );
 661    _mesa_init_attrib( ctx );
 662    _mesa_init_buffer_objects( ctx );
 663    _mesa_init_color( ctx );
 664    _mesa_init_colortables( ctx );
 665    _mesa_init_current( ctx );
 666    _mesa_init_depth( ctx );
 667    _mesa_init_debug( ctx );
 668    _mesa_init_display_list( ctx );
 669    _mesa_init_eval( ctx );
 670    _mesa_init_fbobjects( ctx );
 671    _mesa_init_feedback( ctx );
 672    _mesa_init_fog( ctx );
 673    _mesa_init_histogram( ctx );
 674    _mesa_init_hint( ctx );
 675    _mesa_init_line( ctx );
 676    _mesa_init_lighting( ctx );
 677    _mesa_init_matrix( ctx );
 678    _mesa_init_multisample( ctx );
 679    _mesa_init_pixel( ctx );
 680    _mesa_init_pixelstore( ctx );
 681    _mesa_init_point( ctx );
 682    _mesa_init_polygon( ctx );
 683    _mesa_init_program( ctx );
 684    _mesa_init_queryobj( ctx );
 685 #if FEATURE_ARB_sync
 686    _mesa_init_sync( ctx );
 687 #endif
 688    _mesa_init_rastpos( ctx );
 689    _mesa_init_scissor( ctx );
 690    _mesa_init_shader_state( ctx );
 691    _mesa_init_stencil( ctx );
 692    _mesa_init_transform( ctx );
 693    _mesa_init_transform_feedback( ctx );
 694    _mesa_init_varray( ctx );
 695    _mesa_init_viewport( ctx );
 696
 697    if (!_mesa_init_texture( ctx ))
 698       return GL_FALSE;
 699
 700    _mesa_init_texture_s3tc( ctx );
 701
 702    /* Miscellaneous */
 703    ctx->NewState = _NEW_ALL;
 704    ctx->ErrorValue = (GLenum) GL_NO_ERROR;
 705    ctx->varying_vp_inputs = ~0;
 706
 707    return GL_TRUE;
 708 }
 709
 710
 711 /**
 712  * Update default objects in a GL context with respect to shared state.
 713  *
 714  * \param ctx GL context.
 715  *
 716  * Removes references to old default objects, (texture objects, program
 717  * objects, etc.) and changes to reference those from the current shared
 718  * state.
 719  */
 720 static GLboolean
 721 update_default_objects(GLcontext *ctx)
 722 {
 723    assert(ctx);
 724
 725    _mesa_update_default_objects_program(ctx);
 726    _mesa_update_default_objects_texture(ctx);
 727    _mesa_update_default_objects_buffer_objects(ctx);
 728
 729    return GL_TRUE;
 730 }
 731
 732
 733 /**
 734  * This is the default function we plug into all dispatch table slots
 735  * This helps prevents a segfault when someone calls a GL function without
 736  * first checking if the extension's supported.
 737  */
 738 static int
 739 generic_nop(void)
 740 {
 741    _mesa_warning(NULL, "User called no-op dispatch function (an unsupported extension function?)");
 742    return 0;
 743 }
 744
 745
 746 /**
 747  * Allocate and initialize a new dispatch table.
 748  */
 749 static struct _glapi_table *
 750 alloc_dispatch_table(void)
 751 {
 752    /* Find the larger of Mesa's dispatch table and libGL's dispatch table.
 753     * In practice, this'll be the same for stand-alone Mesa.  But for DRI
 754     * Mesa we do this to accomodate different versions of libGL and various
 755     * DRI drivers.
 756     */
 757    GLint numEntries = MAX2(_glapi_get_dispatch_table_size(),
 758                            sizeof(struct _glapi_table) / sizeof(_glapi_proc));
 759    struct _glapi_table *table =
 760       (struct _glapi_table *) malloc(numEntries * sizeof(_glapi_proc));
 761    if (table) {
 762       _glapi_proc *entry = (_glapi_proc *) table;
 763       GLint i;
 764       for (i = 0; i < numEntries; i++) {
 765          entry[i] = (_glapi_proc) generic_nop;
 766       }
 767    }
 768    return table;
 769 }
 770
 771
 772 /**
 773  * Initialize a GLcontext struct (rendering context).
 774  *
 775  * This includes allocating all the other structs and arrays which hang off of
 776  * the context by pointers.
 777  * Note that the driver needs to pass in its dd_function_table here since
 778  * we need to at least call driverFunctions->NewTextureObject to create the
 779  * default texture objects.
 780  *
 781  * Called by _mesa_create_context().
 782  *
 783  * Performs the imports and exports callback tables initialization, and
 784  * miscellaneous one-time initializations. If no shared context is supplied one
 785  * is allocated, and increase its reference count.  Setups the GL API dispatch
 786  * tables.  Initialize the TNL module. Sets the maximum Z buffer depth.
 787  * Finally queries the \c MESA_DEBUG and \c MESA_VERBOSE environment variables
 788  * for debug flags.
 789  *
 790  * \param ctx the context to initialize
 791  * \param visual describes the visual attributes for this context
 792  * \param share_list points to context to share textures, display lists,
 793  *        etc with, or NULL
 794  * \param driverFunctions table of device driver functions for this context
 795  *        to use
 796  * \param driverContext pointer to driver-specific context data
 797  */
 798 GLboolean
 799 _mesa_initialize_context(GLcontext *ctx,
 800                          const GLvisual *visual,
 801                          GLcontext *share_list,
 802                          const struct dd_function_table *driverFunctions,
 803                          void *driverContext)
 804 {
 805    struct gl_shared_state *shared;
 806
 807    /*ASSERT(driverContext);*/
 808    assert(driverFunctions->NewTextureObject);
 809    assert(driverFunctions->FreeTexImageData);
 810
 811    /* misc one-time initializations */
 812    one_time_init(ctx);
 813
 814    ctx->Visual = *visual;
 815    ctx->DrawBuffer = NULL;
 816    ctx->ReadBuffer = NULL;
 817    ctx->WinSysDrawBuffer = NULL;
 818    ctx->WinSysReadBuffer = NULL;
 819
 820    /* Plug in driver functions and context pointer here.
 821     * This is important because when we call alloc_shared_state() below
 822     * we'll call ctx->Driver.NewTextureObject() to create the default
 823     * textures.
 824     */
 825    ctx->Driver = *driverFunctions;
 826    ctx->DriverCtx = driverContext;
 827
 828    if (share_list) {
 829       /* share state with another context */
 830       shared = share_list->Shared;
 831    }
 832    else {
 833       /* allocate new, unshared state */
 834       shared = _mesa_alloc_shared_state(ctx);
 835       if (!shared)
 836          return GL_FALSE;
 837    }
 838
 839    _glthread_LOCK_MUTEX(shared->Mutex);
 840    ctx->Shared = shared;
 841    shared->RefCount++;
 842    _glthread_UNLOCK_MUTEX(shared->Mutex);
 843
 844    if (!init_attrib_groups( ctx )) {
 845       _mesa_release_shared_state(ctx, ctx->Shared);
 846       return GL_FALSE;
 847    }
 848
 849    /* setup the API dispatch tables */
 850    ctx->Exec = alloc_dispatch_table();
 851    ctx->Save = alloc_dispatch_table();
 852    if (!ctx->Exec || !ctx->Save) {
 853       _mesa_release_shared_state(ctx, ctx->Shared);
 854       if (ctx->Exec)
 855          free(ctx->Exec);
 856       return GL_FALSE;
 857    }
 858 #if FEATURE_dispatch
 859    _mesa_init_exec_table(ctx->Exec);
 860 #endif
 861    ctx->CurrentDispatch = ctx->Exec;
 862
 863 #if FEATURE_dlist
 864    _mesa_init_save_table(ctx->Save);
 865    _mesa_install_save_vtxfmt( ctx, &ctx->ListState.ListVtxfmt );
 866 #endif
 867
 868    /* Neutral tnl module stuff */
 869    _mesa_init_exec_vtxfmt( ctx );
 870    ctx->TnlModule.Current = NULL;
 871    ctx->TnlModule.SwapCount = 0;
 872
 873    ctx->FragmentProgram._MaintainTexEnvProgram
 874       = (_mesa_getenv("MESA_TEX_PROG") != NULL);
 875
 876    ctx->VertexProgram._MaintainTnlProgram
 877       = (_mesa_getenv("MESA_TNL_PROG") != NULL);
 878    if (ctx->VertexProgram._MaintainTnlProgram) {
 879       /* this is required... */
 880       ctx->FragmentProgram._MaintainTexEnvProgram = GL_TRUE;
 881    }
 882
 883 #if FEATURE_extra_context_init
 884    _mesa_initialize_context_extra(ctx);
 885 #endif
 886
 887    ctx->FirstTimeCurrent = GL_TRUE;
 888
 889    return GL_TRUE;
 890 }
 891
 892
 893 /**
 894  * Allocate and initialize a GLcontext structure.
 895  * Note that the driver needs to pass in its dd_function_table here since
 896  * we need to at least call driverFunctions->NewTextureObject to initialize
 897  * the rendering context.
 898  *
 899  * \param visual a GLvisual pointer (we copy the struct contents)
 900  * \param share_list another context to share display lists with or NULL
 901  * \param driverFunctions points to the dd_function_table into which the
 902  *        driver has plugged in all its special functions.
 903  * \param driverContext points to the device driver's private context state
 904  *
 905  * \return pointer to a new __GLcontextRec or NULL if error.
 906  */
 907 GLcontext *
 908 _mesa_create_context(const GLvisual *visual,
 909                      GLcontext *share_list,
 910                      const struct dd_function_table *driverFunctions,
 911                      void *driverContext)
 912 {
 913    GLcontext *ctx;
 914
 915    ASSERT(visual);
 916    /*ASSERT(driverContext);*/
 917
 918    ctx = (GLcontext *) calloc(1, sizeof(GLcontext));
 919    if (!ctx)
 920       return NULL;
 921
 922    if (_mesa_initialize_context(ctx, visual, share_list,
 923                                 driverFunctions, driverContext)) {
 924       return ctx;
 925    }
 926    else {
 927       free(ctx);
 928       return NULL;
 929    }
 930 }
 931
 932
 933 /**
 934  * Free the data associated with the given context.
 935  *
 936  * But doesn't free the GLcontext struct itself.
 937  *
 938  * \sa _mesa_initialize_context() and init_attrib_groups().
 939  */
 940 void
 941 _mesa_free_context_data( GLcontext *ctx )
 942 {
 943    if (!_mesa_get_current_context()){
 944       /* No current context, but we may need one in order to delete
 945        * texture objs, etc.  So temporarily bind the context now.
 946        */
 947       _mesa_make_current(ctx, NULL, NULL);
 948    }
 949
 950    /* unreference WinSysDraw/Read buffers */
 951    _mesa_reference_framebuffer(&ctx->WinSysDrawBuffer, NULL);
 952    _mesa_reference_framebuffer(&ctx->WinSysReadBuffer, NULL);
 953    _mesa_reference_framebuffer(&ctx->DrawBuffer, NULL);
 954    _mesa_reference_framebuffer(&ctx->ReadBuffer, NULL);
 955
 956    _mesa_reference_vertprog(ctx, &ctx->VertexProgram.Current, NULL);
 957    _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current, NULL);
 958    _mesa_reference_vertprog(ctx, &ctx->VertexProgram._TnlProgram, NULL);
 959
 960    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram.Current, NULL);
 961    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current, NULL);
 962    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram, NULL);
 963
 964    _mesa_free_attrib_data(ctx);
 965    _mesa_free_buffer_objects(ctx);
 966    _mesa_free_lighting_data( ctx );
 967    _mesa_free_eval_data( ctx );
 968    _mesa_free_texture_data( ctx );
 969    _mesa_free_matrix_data( ctx );
 970    _mesa_free_viewport_data( ctx );
 971    _mesa_free_colortables_data( ctx );
 972    _mesa_free_program_data(ctx);
 973    _mesa_free_shader_state(ctx);
 974    _mesa_free_queryobj_data(ctx);
 975 #if FEATURE_ARB_sync
 976    _mesa_free_sync_data(ctx);
 977 #endif
 978    _mesa_free_varray_data(ctx);
 979    _mesa_free_transform_feedback(ctx);
 980
 981    _mesa_delete_array_object(ctx, ctx->Array.DefaultArrayObj);
 982
 983 #if FEATURE_ARB_pixel_buffer_object
 984    _mesa_reference_buffer_object(ctx, &ctx->Pack.BufferObj, NULL);
 985    _mesa_reference_buffer_object(ctx, &ctx->Unpack.BufferObj, NULL);
 986    _mesa_reference_buffer_object(ctx, &ctx->DefaultPacking.BufferObj, NULL);
 987 #endif
 988
 989 #if FEATURE_ARB_vertex_buffer_object
 990    _mesa_reference_buffer_object(ctx, &ctx->Array.ArrayBufferObj, NULL);
 991    _mesa_reference_buffer_object(ctx, &ctx->Array.ElementArrayBufferObj, NULL);
 992 #endif
 993
 994    /* free dispatch tables */
 995    free(ctx->Exec);
 996    free(ctx->Save);
 997
 998    /* Shared context state (display lists, textures, etc) */
 999    _mesa_release_shared_state( ctx, ctx->Shared );
1000
1001    /* needs to be after freeing shared state */
1002    _mesa_free_display_list_data(ctx);
1003
1004    if (ctx->Extensions.String)
1005       free((void *) ctx->Extensions.String);
1006
1007    if (ctx->VersionString)
1008       free(ctx->VersionString);
1009
1010    /* unbind the context if it's currently bound */
1011    if (ctx == _mesa_get_current_context()) {
1012       _mesa_make_current(NULL, NULL, NULL);
1013    }
1014 }
1015
1016
1017 /**
1018  * Destroy a GLcontext structure.
1019  *
1020  * \param ctx GL context.
1021  *
1022  * Calls _mesa_free_context_data() and frees the GLcontext structure itself.
1023  */
1024 void
1025 _mesa_destroy_context( GLcontext *ctx )
1026 {
1027    if (ctx) {
1028       _mesa_free_context_data(ctx);
1029       free( (void *) ctx );
1030    }
1031 }
1032
1033
1034 #if _HAVE_FULL_GL
1035 /**
1036  * Copy attribute groups from one context to another.
1037  *
1038  * \param src source context
1039  * \param dst destination context
1040  * \param mask bitwise OR of GL_*_BIT flags
1041  *
1042  * According to the bits specified in \p mask, copies the corresponding
1043  * attributes from \p src into \p dst.  For many of the attributes a simple \c
1044  * memcpy is not enough due to the existence of internal pointers in their data
1045  * structures.
1046  */
1047 void
1048 _mesa_copy_context( const GLcontext *src, GLcontext *dst, GLuint mask )
1049 {
1050    if (mask & GL_ACCUM_BUFFER_BIT) {
1051       /* OK to memcpy */
1052       dst->Accum = src->Accum;
1053    }
1054    if (mask & GL_COLOR_BUFFER_BIT) {
1055       /* OK to memcpy */
1056       dst->Color = src->Color;
1057    }
1058    if (mask & GL_CURRENT_BIT) {
1059       /* OK to memcpy */
1060       dst->Current = src->Current;
1061    }
1062    if (mask & GL_DEPTH_BUFFER_BIT) {
1063       /* OK to memcpy */
1064       dst->Depth = src->Depth;
1065    }
1066    if (mask & GL_ENABLE_BIT) {
1067       /* no op */
1068    }
1069    if (mask & GL_EVAL_BIT) {
1070       /* OK to memcpy */
1071       dst->Eval = src->Eval;
1072    }
1073    if (mask & GL_FOG_BIT) {
1074       /* OK to memcpy */
1075       dst->Fog = src->Fog;
1076    }
1077    if (mask & GL_HINT_BIT) {
1078       /* OK to memcpy */
1079       dst->Hint = src->Hint;
1080    }
1081    if (mask & GL_LIGHTING_BIT) {
1082       GLuint i;
1083       /* begin with memcpy */
1084       dst->Light = src->Light;
1085       /* fixup linked lists to prevent pointer insanity */
1086       make_empty_list( &(dst->Light.EnabledList) );
1087       for (i = 0; i < MAX_LIGHTS; i++) {
1088          if (dst->Light.Light[i].Enabled) {
1089             insert_at_tail(&(dst->Light.EnabledList), &(dst->Light.Light[i]));
1090          }
1091       }
1092    }
1093    if (mask & GL_LINE_BIT) {
1094       /* OK to memcpy */
1095       dst->Line = src->Line;
1096    }
1097    if (mask & GL_LIST_BIT) {
1098       /* OK to memcpy */
1099       dst->List = src->List;
1100    }
1101    if (mask & GL_PIXEL_MODE_BIT) {
1102       /* OK to memcpy */
1103       dst->Pixel = src->Pixel;
1104    }
1105    if (mask & GL_POINT_BIT) {
1106       /* OK to memcpy */
1107       dst->Point = src->Point;
1108    }
1109    if (mask & GL_POLYGON_BIT) {
1110       /* OK to memcpy */
1111       dst->Polygon = src->Polygon;
1112    }
1113    if (mask & GL_POLYGON_STIPPLE_BIT) {
1114       /* Use loop instead of memcpy due to problem with Portland Group's
1115        * C compiler.  Reported by John Stone.
1116        */
1117       GLuint i;
1118       for (i = 0; i < 32; i++) {
1119          dst->PolygonStipple[i] = src->PolygonStipple[i];
1120       }
1121    }
1122    if (mask & GL_SCISSOR_BIT) {
1123       /* OK to memcpy */
1124       dst->Scissor = src->Scissor;
1125    }
1126    if (mask & GL_STENCIL_BUFFER_BIT) {
1127       /* OK to memcpy */
1128       dst->Stencil = src->Stencil;
1129    }
1130    if (mask & GL_TEXTURE_BIT) {
1131       /* Cannot memcpy because of pointers */
1132       _mesa_copy_texture_state(src, dst);
1133    }
1134    if (mask & GL_TRANSFORM_BIT) {
1135       /* OK to memcpy */
1136       dst->Transform = src->Transform;
1137    }
1138    if (mask & GL_VIEWPORT_BIT) {
1139       /* Cannot use memcpy, because of pointers in GLmatrix _WindowMap */
1140       dst->Viewport.X = src->Viewport.X;
1141       dst->Viewport.Y = src->Viewport.Y;
1142       dst->Viewport.Width = src->Viewport.Width;
1143       dst->Viewport.Height = src->Viewport.Height;
1144       dst->Viewport.Near = src->Viewport.Near;
1145       dst->Viewport.Far = src->Viewport.Far;
1146       _math_matrix_copy(&dst->Viewport._WindowMap, &src->Viewport._WindowMap);
1147    }
1148
1149    /* XXX FIXME:  Call callbacks?
1150     */
1151    dst->NewState = _NEW_ALL;
1152 }
1153 #endif
1154
1155
1156 /**
1157  * Check if the given context can render into the given framebuffer
1158  * by checking visual attributes.
1159  *
1160  * Most of these tests could go away because Mesa is now pretty flexible
1161  * in terms of mixing rendering contexts with framebuffers.  As long
1162  * as RGB vs. CI mode agree, we're probably good.
1163  *
1164  * \return GL_TRUE if compatible, GL_FALSE otherwise.
1165  */
1166 static GLboolean
1167 check_compatible(const GLcontext *ctx, const GLframebuffer *buffer)
1168 {
1169    const GLvisual *ctxvis = &ctx->Visual;
1170    const GLvisual *bufvis = &buffer->Visual;
1171
1172    if (ctxvis == bufvis)
1173       return GL_TRUE;
1174
1175 #if 0
1176    /* disabling this fixes the fgl_glxgears pbuffer demo */
1177    if (ctxvis->doubleBufferMode && !bufvis->doubleBufferMode)
1178       return GL_FALSE;
1179 #endif
1180    if (ctxvis->stereoMode && !bufvis->stereoMode)
1181       return GL_FALSE;
1182    if (ctxvis->haveAccumBuffer && !bufvis->haveAccumBuffer)
1183       return GL_FALSE;
1184    if (ctxvis->haveDepthBuffer && !bufvis->haveDepthBuffer)
1185       return GL_FALSE;
1186    if (ctxvis->haveStencilBuffer && !bufvis->haveStencilBuffer)
1187       return GL_FALSE;
1188    if (ctxvis->redMask && ctxvis->redMask != bufvis->redMask)
1189       return GL_FALSE;
1190    if (ctxvis->greenMask && ctxvis->greenMask != bufvis->greenMask)
1191       return GL_FALSE;
1192    if (ctxvis->blueMask && ctxvis->blueMask != bufvis->blueMask)
1193       return GL_FALSE;
1194 #if 0
1195    /* disabled (see bug 11161) */
1196    if (ctxvis->depthBits && ctxvis->depthBits != bufvis->depthBits)
1197       return GL_FALSE;
1198 #endif
1199    if (ctxvis->stencilBits && ctxvis->stencilBits != bufvis->stencilBits)
1200       return GL_FALSE;
1201
1202    return GL_TRUE;
1203 }
1204
1205
1206 /**
1207  * Do one-time initialization for the given framebuffer.  Specifically,
1208  * ask the driver for the window's current size and update the framebuffer
1209  * object to match.
1210  * Really, the device driver should totally take care of this.
1211  */
1212 static void
1213 initialize_framebuffer_size(GLcontext *ctx, GLframebuffer *fb)
1214 {
1215    GLuint width, height;
1216    if (ctx->Driver.GetBufferSize) {
1217       ctx->Driver.GetBufferSize(fb, &width, &height);
1218       if (ctx->Driver.ResizeBuffers)
1219          ctx->Driver.ResizeBuffers(ctx, fb, width, height);
1220       fb->Initialized = GL_TRUE;
1221    }
1222 }
1223
1224
1225 /**
1226  * Check if the viewport/scissor size has not yet been initialized.
1227  * Initialize the size if the given width and height are non-zero.
1228  */
1229 void
1230 _mesa_check_init_viewport(GLcontext *ctx, GLuint width, GLuint height)
1231 {
1232    if (!ctx->ViewportInitialized && width > 0 && height > 0) {
1233       /* Note: set flag here, before calling _mesa_set_viewport(), to prevent
1234        * potential infinite recursion.
1235        */
1236       ctx->ViewportInitialized = GL_TRUE;
1237       _mesa_set_viewport(ctx, 0, 0, width, height);
1238       _mesa_set_scissor(ctx, 0, 0, width, height);
1239    }
1240 }
1241
1242
1243 /**
1244  * Bind the given context to the given drawBuffer and readBuffer and
1245  * make it the current context for the calling thread.
1246  * We'll render into the drawBuffer and read pixels from the
1247  * readBuffer (i.e. glRead/CopyPixels, glCopyTexImage, etc).
1248  *
1249  * We check that the context's and framebuffer's visuals are compatible
1250  * and return immediately if they're not.
1251  *
1252  * \param newCtx  the new GL context. If NULL then there will be no current GL
1253  *                context.
1254  * \param drawBuffer  the drawing framebuffer
1255  * \param readBuffer  the reading framebuffer
1256  */
1257 GLboolean
1258 _mesa_make_current( GLcontext *newCtx, GLframebuffer *drawBuffer,
1259                     GLframebuffer *readBuffer )
1260 {
1261    if (MESA_VERBOSE & VERBOSE_API)
1262       _mesa_debug(newCtx, "_mesa_make_current()\n");
1263
1264    /* Check that the context's and framebuffer's visuals are compatible.
1265     */
1266    if (newCtx && drawBuffer && newCtx->WinSysDrawBuffer != drawBuffer) {
1267       if (!check_compatible(newCtx, drawBuffer)) {
1268          _mesa_warning(newCtx,
1269               "MakeCurrent: incompatible visuals for context and drawbuffer");
1270          return GL_FALSE;
1271       }
1272    }
1273    if (newCtx && readBuffer && newCtx->WinSysReadBuffer != readBuffer) {
1274       if (!check_compatible(newCtx, readBuffer)) {
1275          _mesa_warning(newCtx,
1276               "MakeCurrent: incompatible visuals for context and readbuffer");
1277          return GL_FALSE;
1278       }
1279    }
1280
1281    /* We used to call _glapi_check_multithread() here.  Now do it in drivers */
1282    _glapi_set_context((void *) newCtx);
1283    ASSERT(_mesa_get_current_context() == newCtx);
1284
1285    if (!newCtx) {
1286       _glapi_set_dispatch(NULL);  /* none current */
1287    }
1288    else {
1289       _glapi_set_dispatch(newCtx->CurrentDispatch);
1290
1291       if (drawBuffer && readBuffer) {
1292          /* TODO: check if newCtx and buffer's visual match??? */
1293
1294          ASSERT(drawBuffer->Name == 0);
1295          ASSERT(readBuffer->Name == 0);
1296          _mesa_reference_framebuffer(&newCtx->WinSysDrawBuffer, drawBuffer);
1297          _mesa_reference_framebuffer(&newCtx->WinSysReadBuffer, readBuffer);
1298
1299          /*
1300           * Only set the context's Draw/ReadBuffer fields if they're NULL
1301           * or not bound to a user-created FBO.
1302           */
1303          if (!newCtx->DrawBuffer || newCtx->DrawBuffer->Name == 0) {
1304             /* KW: merge conflict here, revisit.
1305              */
1306             /* fix up the fb fields - these will end up wrong otherwise
1307              * if the DRIdrawable changes, and everything relies on them.
1308              * This is a bit messy (same as needed in _mesa_BindFramebufferEXT)
1309              */
1310             unsigned int i;
1311             GLenum buffers[MAX_DRAW_BUFFERS];
1312
1313             _mesa_reference_framebuffer(&newCtx->DrawBuffer, drawBuffer);
1314
1315             for(i = 0; i < newCtx->Const.MaxDrawBuffers; i++) {
1316                buffers[i] = newCtx->Color.DrawBuffer[i];
1317             }
1318
1319             _mesa_drawbuffers(newCtx, newCtx->Const.MaxDrawBuffers, buffers, NULL);
1320          }
1321          if (!newCtx->ReadBuffer || newCtx->ReadBuffer->Name == 0) {
1322             _mesa_reference_framebuffer(&newCtx->ReadBuffer, readBuffer);
1323          }
1324
1325          /* XXX only set this flag if we're really changing the draw/read
1326           * framebuffer bindings.
1327           */
1328          newCtx->NewState |= _NEW_BUFFERS;
1329
1330 #if 1
1331          /* We want to get rid of these lines: */
1332
1333 #if _HAVE_FULL_GL
1334          if (!drawBuffer->Initialized) {
1335             initialize_framebuffer_size(newCtx, drawBuffer);
1336          }
1337          if (readBuffer != drawBuffer && !readBuffer->Initialized) {
1338             initialize_framebuffer_size(newCtx, readBuffer);
1339          }
1340
1341          _mesa_resizebuffers(newCtx);
1342 #endif
1343
1344 #else
1345          /* We want the drawBuffer and readBuffer to be initialized by
1346           * the driver.
1347           * This generally means the Width and Height match the actual
1348           * window size and the renderbuffers (both hardware and software
1349           * based) are allocated to match.  The later can generally be
1350           * done with a call to _mesa_resize_framebuffer().
1351           *
1352           * It's theoretically possible for a buffer to have zero width
1353           * or height, but for now, assert check that the driver did what's
1354           * expected of it.
1355           */
1356          ASSERT(drawBuffer->Width > 0);
1357          ASSERT(drawBuffer->Height > 0);
1358 #endif
1359
1360          if (drawBuffer) {
1361             _mesa_check_init_viewport(newCtx,
1362                                       drawBuffer->Width, drawBuffer->Height);
1363          }
1364       }
1365
1366       if (newCtx->FirstTimeCurrent) {
1367          _mesa_compute_version(newCtx);
1368
1369          check_context_limits(newCtx);
1370
1371          /* We can use this to help debug user's problems.  Tell them to set
1372           * the MESA_INFO env variable before running their app.  Then the
1373           * first time each context is made current we'll print some useful
1374           * information.
1375           */
1376          if (_mesa_getenv("MESA_INFO")) {
1377             _mesa_print_info();
1378          }
1379
1380          newCtx->FirstTimeCurrent = GL_FALSE;
1381       }
1382    }
1383
1384    return GL_TRUE;
1385 }
1386
1387
1388 /**
1389  * Make context 'ctx' share the display lists, textures and programs
1390  * that are associated with 'ctxToShare'.
1391  * Any display lists, textures or programs associated with 'ctx' will
1392  * be deleted if nobody else is sharing them.
1393  */
1394 GLboolean
1395 _mesa_share_state(GLcontext *ctx, GLcontext *ctxToShare)
1396 {
1397    if (ctx && ctxToShare && ctx->Shared && ctxToShare->Shared) {
1398       struct gl_shared_state *oldSharedState = ctx->Shared;
1399
1400       ctx->Shared = ctxToShare->Shared;
1401
1402       _glthread_LOCK_MUTEX(ctx->Shared->Mutex);
1403       ctx->Shared->RefCount++;
1404       _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
1405
1406       update_default_objects(ctx);
1407
1408       _mesa_release_shared_state(ctx, oldSharedState);
1409
1410       return GL_TRUE;
1411    }
1412    else {
1413       return GL_FALSE;
1414    }
1415 }
1416
1417
1418
1419 /**
1420  * \return pointer to the current GL context for this thread.
1421  *
1422  * Calls _glapi_get_context(). This isn't the fastest way to get the current
1423  * context.  If you need speed, see the #GET_CURRENT_CONTEXT macro in
1424  * context.h.
1425  */
1426 GLcontext *
1427 _mesa_get_current_context( void )
1428 {
1429    return (GLcontext *) _glapi_get_context();
1430 }
1431
1432
1433 /**
1434  * Get context's current API dispatch table.
1435  *
1436  * It'll either be the immediate-mode execute dispatcher or the display list
1437  * compile dispatcher.
1438  *
1439  * \param ctx GL context.
1440  *
1441  * \return pointer to dispatch_table.
1442  *
1443  * Simply returns __GLcontextRec::CurrentDispatch.
1444  */
1445 struct _glapi_table *
1446 _mesa_get_dispatch(GLcontext *ctx)
1447 {
1448    return ctx->CurrentDispatch;
1449 }
1450
1451 /*@}*/
1452
1453
1454 /**********************************************************************/
1455 /** \name Miscellaneous functions                                     */
1456 /**********************************************************************/
1457 /*@{*/
1458
1459 /**
1460  * Record an error.
1461  *
1462  * \param ctx GL context.
1463  * \param error error code.
1464  *
1465  * Records the given error code and call the driver's dd_function_table::Error
1466  * function if defined.
1467  *
1468  * \sa
1469  * This is called via _mesa_error().
1470  */
1471 void
1472 _mesa_record_error(GLcontext *ctx, GLenum error)
1473 {
1474    if (!ctx)
1475       return;
1476
1477    if (ctx->ErrorValue == GL_NO_ERROR) {
1478       ctx->ErrorValue = error;
1479    }
1480
1481    /* Call device driver's error handler, if any.  This is used on the Mac. */
1482    if (ctx->Driver.Error) {
1483       ctx->Driver.Error(ctx);
1484    }
1485 }
1486
1487
1488 /**
1489  * Flush commands and wait for completion.
1490  */
1491 void
1492 _mesa_finish(GLcontext *ctx)
1493 {
1494    FLUSH_CURRENT( ctx, 0 );
1495    if (ctx->Driver.Finish) {
1496       ctx->Driver.Finish(ctx);
1497    }
1498 }
1499
1500
1501 /**
1502  * Flush commands.
1503  */
1504 void
1505 _mesa_flush(GLcontext *ctx)
1506 {
1507    FLUSH_CURRENT( ctx, 0 );
1508    if (ctx->Driver.Flush) {
1509       ctx->Driver.Flush(ctx);
1510    }
1511 }
1512
1513
1514
1515 /**
1516  * Execute glFinish().
1517  *
1518  * Calls the #ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH macro and the
1519  * dd_function_table::Finish driver callback, if not NULL.
1520  */
1521 void GLAPIENTRY
1522 _mesa_Finish(void)
1523 {
1524    GET_CURRENT_CONTEXT(ctx);
1525    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
1526    _mesa_finish(ctx);
1527 }
1528
1529
1530 /**
1531  * Execute glFlush().
1532  *
1533  * Calls the #ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH macro and the
1534  * dd_function_table::Flush driver callback, if not NULL.
1535  */
1536 void GLAPIENTRY
1537 _mesa_Flush(void)
1538 {
1539    GET_CURRENT_CONTEXT(ctx);
1540    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
1541    _mesa_flush(ctx);
1542 }
1543
1544
1545 /**
1546  * Set mvp_with_dp4 flag.  If a driver has a preference for DP4 over
1547  * MUL/MAD, or vice versa, call this function to register that.
1548  * Otherwise we default to MUL/MAD.
1549  */
1550 void
1551 _mesa_set_mvp_with_dp4( GLcontext *ctx,
1552                         GLboolean flag )
1553 {
1554    ctx->mvp_with_dp4 = flag;
1555 }
1556
1557
1558
1559 /**
1560  * Prior to drawing anything with glBegin, glDrawArrays, etc. this function
1561  * is called to see if it's valid to render.  This involves checking that
1562  * the current shader is valid and the framebuffer is complete.
1563  * If an error is detected it'll be recorded here.
1564  * \return GL_TRUE if OK to render, GL_FALSE if not
1565  */
1566 GLboolean
1567 _mesa_valid_to_render(GLcontext *ctx, const char *where)
1568 {
1569    /* This depends on having up to date derived state (shaders) */
1570    if (ctx->NewState)
1571       _mesa_update_state(ctx);
1572
1573    if (ctx->Shader.CurrentProgram) {
1574       /* using shaders */
1575       if (!ctx->Shader.CurrentProgram->LinkStatus) {
1576          _mesa_error(ctx, GL_INVALID_OPERATION,
1577                      "%s(shader not linked), where");
1578          return GL_FALSE;
1579       }
1580 #if 0 /* not normally enabled */
1581       {
1582          char errMsg[100];
1583          if (!_mesa_validate_shader_program(ctx, ctx->Shader.CurrentProgram,
1584                                             errMsg)) {
1585             _mesa_warning(ctx, "Shader program %u is invalid: %s",
1586                           ctx->Shader.CurrentProgram->Name, errMsg);
1587          }
1588       }
1589 #endif
1590    }
1591    else {
1592       if (ctx->VertexProgram.Enabled && !ctx->VertexProgram._Enabled) {
1593          _mesa_error(ctx, GL_INVALID_OPERATION,
1594                      "%s(vertex program not valid)", where);
1595          return GL_FALSE;
1596       }
1597       if (ctx->FragmentProgram.Enabled && !ctx->FragmentProgram._Enabled) {
1598          _mesa_error(ctx, GL_INVALID_OPERATION,
1599                      "%s(fragment program not valid)", where);
1600          return GL_FALSE;
1601       }
1602    }
1603
1604    if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
1605       _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
1606                   "%s(incomplete framebuffer)", where);
1607       return GL_FALSE;
1608    }
1609
1610 #ifdef DEBUG
1611    if (ctx->Shader.Flags & GLSL_LOG) {
1612       struct gl_shader_program *shProg = ctx->Shader.CurrentProgram;
1613       if (shProg) {
1614          if (!shProg->_Used) {
1615             /* This is the first time this shader is being used.
1616              * Append shader's constants/uniforms to log file.
1617              */
1618             GLuint i;
1619             for (i = 0; i < shProg->NumShaders; i++) {
1620                struct gl_shader *sh = shProg->Shaders[i];
1621                if (sh->Type == GL_VERTEX_SHADER) {
1622                   _mesa_append_uniforms_to_file(sh,
1623                                                 &shProg->VertexProgram->Base);
1624                }
1625                else if (sh->Type == GL_FRAGMENT_SHADER) {
1626                   _mesa_append_uniforms_to_file(sh,
1627                                                 &shProg->FragmentProgram->Base);
1628                }
1629             }
1630             shProg->_Used = GL_TRUE;
1631          }
1632       }
1633    }
1634 #endif
1635
1636    return GL_TRUE;
1637 }
1638
1639
1640 /*@}*/