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 #if FEATURE_accum
  83 #include "accum.h"
  84 #endif
  85 #include "api_exec.h"
  86 #include "arrayobj.h"
  87 #if FEATURE_attrib_stack
  88 #include "attrib.h"
  89 #endif
  90 #include "blend.h"
  91 #include "buffers.h"
  92 #include "bufferobj.h"
  93 #if FEATURE_colortable
  94 #include "colortab.h"
  95 #endif
  96 #include "context.h"
  97 #include "cpuinfo.h"
  98 #include "debug.h"
  99 #include "depth.h"
 100 #if FEATURE_dlist
 101 #include "dlist.h"
 102 #endif
 103 #if FEATURE_evaluators
 104 #include "eval.h"
 105 #endif
 106 #include "enums.h"
 107 #include "extensions.h"
 108 #include "fbobject.h"
 109 #if FEATURE_feedback
 110 #include "feedback.h"
 111 #endif
 112 #include "fog.h"
 113 #include "framebuffer.h"
 114 #include "get.h"
 115 #if FEATURE_histogram
 116 #include "histogram.h"
 117 #endif
 118 #include "hint.h"
 119 #include "hash.h"
 120 #include "light.h"
 121 #include "lines.h"
 122 #include "macros.h"
 123 #include "matrix.h"
 124 #include "multisample.h"
 125 #include "pixel.h"
 126 #include "pixelstore.h"
 127 #include "points.h"
 128 #include "polygon.h"
 129 #if FEATURE_ARB_occlusion_query
 130 #include "queryobj.h"
 131 #endif
 132 #if FEATURE_drawpix
 133 #include "rastpos.h"
 134 #endif
 135 #include "scissor.h"
 136 #include "shared.h"
 137 #include "simple_list.h"
 138 #include "state.h"
 139 #include "stencil.h"
 140 #include "texcompress.h"
 141 #include "teximage.h"
 142 #include "texobj.h"
 143 #include "texstate.h"
 144 #include "mtypes.h"
 145 #include "varray.h"
 146 #include "version.h"
 147 #include "viewport.h"
 148 #include "vtxfmt.h"
 149 #include "glapi/glthread.h"
 150 #include "glapi/glapioffsets.h"
 151 #include "glapi/glapitable.h"
 152 #include "shader/program.h"
 153 #include "shader/shader_api.h"
 154 #if FEATURE_ATI_fragment_shader
 155 #include "shader/atifragshader.h"
 156 #endif
 157 #if _HAVE_FULL_GL
 158 #include "math/m_matrix.h"
 159 #endif
 160
 161 #ifdef USE_SPARC_ASM
 162 #include "sparc/sparc.h"
 163 #endif
 164
 165 #ifndef MESA_VERBOSE
 166 int MESA_VERBOSE = 0;
 167 #endif
 168
 169 #ifndef MESA_DEBUG_FLAGS
 170 int MESA_DEBUG_FLAGS = 0;
 171 #endif
 172
 173
 174 /* ubyte -> float conversion */
 175 GLfloat _mesa_ubyte_to_float_color_tab[256];
 176
 177
 178
 179 /**
 180  * Swap buffers notification callback.
 181  *
 182  * \param ctx GL context.
 183  *
 184  * Called by window system just before swapping buffers.
 185  * We have to finish any pending rendering.
 186  */
 187 void
 188 _mesa_notifySwapBuffers(__GLcontext *ctx)
 189 {
 190    FLUSH_CURRENT( ctx, 0 );
 191    if (ctx->Driver.Flush) {
 192       ctx->Driver.Flush(ctx);
 193    }
 194 }
 195
 196
 197 /**********************************************************************/
 198 /** \name GL Visual allocation/destruction                            */
 199 /**********************************************************************/
 200 /*@{*/
 201
 202 /**
 203  * Allocates a GLvisual structure and initializes it via
 204  * _mesa_initialize_visual().
 205  *
 206  * \param rgbFlag GL_TRUE for RGB(A) mode, GL_FALSE for Color Index mode.
 207  * \param dbFlag double buffering
 208  * \param stereoFlag stereo buffer
 209  * \param depthBits requested bits per depth buffer value. Any value in [0, 32]
 210  * is acceptable but the actual depth type will be GLushort or GLuint as
 211  * needed.
 212  * \param stencilBits requested minimum bits per stencil buffer value
 213  * \param accumRedBits, accumGreenBits, accumBlueBits, accumAlphaBits number of bits per color component in accum buffer.
 214  * \param indexBits number of bits per pixel if \p rgbFlag is GL_FALSE
 215  * \param redBits number of bits per color component in frame buffer for RGB(A)
 216  * mode.  We always use 8 in core Mesa though.
 217  * \param greenBits same as above.
 218  * \param blueBits same as above.
 219  * \param alphaBits same as above.
 220  * \param numSamples not really used.
 221  *
 222  * \return pointer to new GLvisual or NULL if requested parameters can't be
 223  * met.
 224  *
 225  * \note Need to add params for level and numAuxBuffers (at least)
 226  */
 227 GLvisual *
 228 _mesa_create_visual( GLboolean rgbFlag,
 229                      GLboolean dbFlag,
 230                      GLboolean stereoFlag,
 231                      GLint redBits,
 232                      GLint greenBits,
 233                      GLint blueBits,
 234                      GLint alphaBits,
 235                      GLint indexBits,
 236                      GLint depthBits,
 237                      GLint stencilBits,
 238                      GLint accumRedBits,
 239                      GLint accumGreenBits,
 240                      GLint accumBlueBits,
 241                      GLint accumAlphaBits,
 242                      GLint numSamples )
 243 {
 244    GLvisual *vis = (GLvisual *) _mesa_calloc(sizeof(GLvisual));
 245    if (vis) {
 246       if (!_mesa_initialize_visual(vis, rgbFlag, dbFlag, stereoFlag,
 247                                    redBits, greenBits, blueBits, alphaBits,
 248                                    indexBits, depthBits, stencilBits,
 249                                    accumRedBits, accumGreenBits,
 250                                    accumBlueBits, accumAlphaBits,
 251                                    numSamples)) {
 252          _mesa_free(vis);
 253          return NULL;
 254       }
 255    }
 256    return vis;
 257 }
 258
 259 /**
 260  * Makes some sanity checks and fills in the fields of the
 261  * GLvisual object with the given parameters.  If the caller needs
 262  * to set additional fields, he should just probably init the whole GLvisual
 263  * object himself.
 264  * \return GL_TRUE on success, or GL_FALSE on failure.
 265  *
 266  * \sa _mesa_create_visual() above for the parameter description.
 267  */
 268 GLboolean
 269 _mesa_initialize_visual( GLvisual *vis,
 270                          GLboolean rgbFlag,
 271                          GLboolean dbFlag,
 272                          GLboolean stereoFlag,
 273                          GLint redBits,
 274                          GLint greenBits,
 275                          GLint blueBits,
 276                          GLint alphaBits,
 277                          GLint indexBits,
 278                          GLint depthBits,
 279                          GLint stencilBits,
 280                          GLint accumRedBits,
 281                          GLint accumGreenBits,
 282                          GLint accumBlueBits,
 283                          GLint accumAlphaBits,
 284                          GLint numSamples )
 285 {
 286    assert(vis);
 287
 288    if (depthBits < 0 || depthBits > 32) {
 289       return GL_FALSE;
 290    }
 291    if (stencilBits < 0 || stencilBits > STENCIL_BITS) {
 292       return GL_FALSE;
 293    }
 294    assert(accumRedBits >= 0);
 295    assert(accumGreenBits >= 0);
 296    assert(accumBlueBits >= 0);
 297    assert(accumAlphaBits >= 0);
 298
 299    vis->rgbMode          = rgbFlag;
 300    vis->doubleBufferMode = dbFlag;
 301    vis->stereoMode       = stereoFlag;
 302
 303    vis->redBits          = redBits;
 304    vis->greenBits        = greenBits;
 305    vis->blueBits         = blueBits;
 306    vis->alphaBits        = alphaBits;
 307    vis->rgbBits          = redBits + greenBits + blueBits;
 308
 309    vis->indexBits      = indexBits;
 310    vis->depthBits      = depthBits;
 311    vis->stencilBits    = stencilBits;
 312
 313    vis->accumRedBits   = accumRedBits;
 314    vis->accumGreenBits = accumGreenBits;
 315    vis->accumBlueBits  = accumBlueBits;
 316    vis->accumAlphaBits = accumAlphaBits;
 317
 318    vis->haveAccumBuffer   = accumRedBits > 0;
 319    vis->haveDepthBuffer   = depthBits > 0;
 320    vis->haveStencilBuffer = stencilBits > 0;
 321
 322    vis->numAuxBuffers = 0;
 323    vis->level = 0;
 324    vis->pixmapMode = 0;
 325    vis->sampleBuffers = numSamples > 0 ? 1 : 0;
 326    vis->samples = numSamples;
 327
 328    return GL_TRUE;
 329 }
 330
 331
 332 /**
 333  * Destroy a visual and free its memory.
 334  *
 335  * \param vis visual.
 336  *
 337  * Frees the visual structure.
 338  */
 339 void
 340 _mesa_destroy_visual( GLvisual *vis )
 341 {
 342    _mesa_free(vis);
 343 }
 344
 345 /*@}*/
 346
 347
 348 /**********************************************************************/
 349 /** \name Context allocation, initialization, destroying
 350  *
 351  * The purpose of the most initialization functions here is to provide the
 352  * default state values according to the OpenGL specification.
 353  */
 354 /**********************************************************************/
 355 /*@{*/
 356
 357
 358 /**
 359  * This is lame.  gdb only seems to recognize enum types that are
 360  * actually used somewhere.  We want to be able to print/use enum
 361  * values such as TEXTURE_2D_INDEX in gdb.  But we don't actually use
 362  * the gl_texture_index type anywhere.  Thus, this lame function.
 363  */
 364 static void
 365 dummy_enum_func(void)
 366 {
 367    gl_buffer_index bi;
 368    gl_colortable_index ci;
 369    gl_face_index fi;
 370    gl_frag_attrib fa;
 371    gl_frag_result fr;
 372    gl_texture_index ti;
 373    gl_vert_attrib va;
 374    gl_vert_result vr;
 375
 376    (void) bi;
 377    (void) ci;
 378    (void) fi;
 379    (void) fa;
 380    (void) fr;
 381    (void) ti;
 382    (void) va;
 383    (void) vr;
 384 }
 385
 386
 387 /**
 388  * One-time initialization mutex lock.
 389  *
 390  * \sa Used by one_time_init().
 391  */
 392 _glthread_DECLARE_STATIC_MUTEX(OneTimeLock);
 393
 394 /**
 395  * Calls all the various one-time-init functions in Mesa.
 396  *
 397  * While holding a global mutex lock, calls several initialization functions,
 398  * and sets the glapi callbacks if the \c MESA_DEBUG environment variable is
 399  * defined.
 400  *
 401  * \sa _math_init().
 402  */
 403 static void
 404 one_time_init( GLcontext *ctx )
 405 {
 406    static GLboolean alreadyCalled = GL_FALSE;
 407    (void) ctx;
 408    _glthread_LOCK_MUTEX(OneTimeLock);
 409    if (!alreadyCalled) {
 410       GLuint i;
 411
 412       /* do some implementation tests */
 413       assert( sizeof(GLbyte) == 1 );
 414       assert( sizeof(GLubyte) == 1 );
 415       assert( sizeof(GLshort) == 2 );
 416       assert( sizeof(GLushort) == 2 );
 417       assert( sizeof(GLint) == 4 );
 418       assert( sizeof(GLuint) == 4 );
 419
 420       _mesa_get_cpu_features();
 421
 422       _mesa_init_sqrt_table();
 423
 424       for (i = 0; i < 256; i++) {
 425          _mesa_ubyte_to_float_color_tab[i] = (float) i / 255.0F;
 426       }
 427
 428       if (_mesa_getenv("MESA_DEBUG")) {
 429          _glapi_noop_enable_warnings(GL_TRUE);
 430          _glapi_set_warning_func( (_glapi_warning_func) _mesa_warning );
 431       }
 432       else {
 433          _glapi_noop_enable_warnings(GL_FALSE);
 434       }
 435
 436 #if defined(DEBUG) && defined(__DATE__) && defined(__TIME__)
 437       _mesa_debug(ctx, "Mesa %s DEBUG build %s %s\n",
 438                   MESA_VERSION_STRING, __DATE__, __TIME__);
 439 #endif
 440
 441       alreadyCalled = GL_TRUE;
 442    }
 443    _glthread_UNLOCK_MUTEX(OneTimeLock);
 444
 445    dummy_enum_func();
 446 }
 447
 448
 449 /**
 450  * Initialize fields of gl_current_attrib (aka ctx->Current.*)
 451  */
 452 static void
 453 _mesa_init_current(GLcontext *ctx)
 454 {
 455    GLuint i;
 456
 457    /* Init all to (0,0,0,1) */
 458    for (i = 0; i < VERT_ATTRIB_MAX; i++) {
 459       ASSIGN_4V( ctx->Current.Attrib[i], 0.0, 0.0, 0.0, 1.0 );
 460    }
 461
 462    /* redo special cases: */
 463    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_WEIGHT], 1.0, 0.0, 0.0, 0.0 );
 464    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_NORMAL], 0.0, 0.0, 1.0, 1.0 );
 465    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_COLOR0], 1.0, 1.0, 1.0, 1.0 );
 466    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_COLOR1], 0.0, 0.0, 0.0, 1.0 );
 467    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_COLOR_INDEX], 1.0, 0.0, 0.0, 1.0 );
 468    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_EDGEFLAG], 1.0, 0.0, 0.0, 1.0 );
 469 }
 470
 471
 472 /**
 473  * Init vertex/fragment program limits.
 474  * Important: drivers should override these with actual limits.
 475  */
 476 static void
 477 init_program_limits(GLenum type, struct gl_program_constants *prog)
 478 {
 479    prog->MaxInstructions = MAX_PROGRAM_INSTRUCTIONS;
 480    prog->MaxAluInstructions = MAX_PROGRAM_INSTRUCTIONS;
 481    prog->MaxTexInstructions = MAX_PROGRAM_INSTRUCTIONS;
 482    prog->MaxTexIndirections = MAX_PROGRAM_INSTRUCTIONS;
 483    prog->MaxTemps = MAX_PROGRAM_TEMPS;
 484    prog->MaxEnvParams = MAX_PROGRAM_ENV_PARAMS;
 485    prog->MaxLocalParams = MAX_PROGRAM_LOCAL_PARAMS;
 486    prog->MaxUniformComponents = 4 * MAX_UNIFORMS;
 487
 488    if (type == GL_VERTEX_PROGRAM_ARB) {
 489       prog->MaxParameters = MAX_NV_VERTEX_PROGRAM_PARAMS;
 490       prog->MaxAttribs = MAX_NV_VERTEX_PROGRAM_INPUTS;
 491       prog->MaxAddressRegs = MAX_VERTEX_PROGRAM_ADDRESS_REGS;
 492    }
 493    else {
 494       prog->MaxParameters = MAX_NV_FRAGMENT_PROGRAM_PARAMS;
 495       prog->MaxAttribs = MAX_NV_FRAGMENT_PROGRAM_INPUTS;
 496       prog->MaxAddressRegs = MAX_FRAGMENT_PROGRAM_ADDRESS_REGS;
 497    }
 498
 499    /* copy the above limits to init native limits */
 500    prog->MaxNativeInstructions = prog->MaxInstructions;
 501    prog->MaxNativeAluInstructions = prog->MaxAluInstructions;
 502    prog->MaxNativeTexInstructions = prog->MaxTexInstructions;
 503    prog->MaxNativeTexIndirections = prog->MaxTexIndirections;
 504    prog->MaxNativeAttribs = prog->MaxAttribs;
 505    prog->MaxNativeTemps = prog->MaxTemps;
 506    prog->MaxNativeAddressRegs = prog->MaxAddressRegs;
 507    prog->MaxNativeParameters = prog->MaxParameters;
 508 }
 509
 510
 511 /**
 512  * Initialize fields of gl_constants (aka ctx->Const.*).
 513  * Use defaults from config.h.  The device drivers will often override
 514  * some of these values (such as number of texture units).
 515  */
 516 static void
 517 _mesa_init_constants(GLcontext *ctx)
 518 {
 519    assert(ctx);
 520
 521    assert(MAX_TEXTURE_LEVELS >= MAX_3D_TEXTURE_LEVELS);
 522    assert(MAX_TEXTURE_LEVELS >= MAX_CUBE_TEXTURE_LEVELS);
 523
 524    /* Max texture size should be <= max viewport size (render to texture) */
 525    assert((1 << (MAX_TEXTURE_LEVELS - 1)) <= MAX_WIDTH);
 526
 527    /* Constants, may be overriden (usually only reduced) by device drivers */
 528    ctx->Const.MaxTextureLevels = MAX_TEXTURE_LEVELS;
 529    ctx->Const.Max3DTextureLevels = MAX_3D_TEXTURE_LEVELS;
 530    ctx->Const.MaxCubeTextureLevels = MAX_CUBE_TEXTURE_LEVELS;
 531    ctx->Const.MaxTextureRectSize = MAX_TEXTURE_RECT_SIZE;
 532    ctx->Const.MaxArrayTextureLayers = MAX_ARRAY_TEXTURE_LAYERS;
 533    ctx->Const.MaxTextureCoordUnits = MAX_TEXTURE_COORD_UNITS;
 534    ctx->Const.MaxTextureImageUnits = MAX_TEXTURE_IMAGE_UNITS;
 535    ctx->Const.MaxTextureUnits = MIN2(ctx->Const.MaxTextureCoordUnits,
 536                                      ctx->Const.MaxTextureImageUnits);
 537    ctx->Const.MaxTextureMaxAnisotropy = MAX_TEXTURE_MAX_ANISOTROPY;
 538    ctx->Const.MaxTextureLodBias = MAX_TEXTURE_LOD_BIAS;
 539    ctx->Const.MaxArrayLockSize = MAX_ARRAY_LOCK_SIZE;
 540    ctx->Const.SubPixelBits = SUB_PIXEL_BITS;
 541    ctx->Const.MinPointSize = MIN_POINT_SIZE;
 542    ctx->Const.MaxPointSize = MAX_POINT_SIZE;
 543    ctx->Const.MinPointSizeAA = MIN_POINT_SIZE;
 544    ctx->Const.MaxPointSizeAA = MAX_POINT_SIZE;
 545    ctx->Const.PointSizeGranularity = (GLfloat) POINT_SIZE_GRANULARITY;
 546    ctx->Const.MinLineWidth = MIN_LINE_WIDTH;
 547    ctx->Const.MaxLineWidth = MAX_LINE_WIDTH;
 548    ctx->Const.MinLineWidthAA = MIN_LINE_WIDTH;
 549    ctx->Const.MaxLineWidthAA = MAX_LINE_WIDTH;
 550    ctx->Const.LineWidthGranularity = (GLfloat) LINE_WIDTH_GRANULARITY;
 551    ctx->Const.MaxColorTableSize = MAX_COLOR_TABLE_SIZE;
 552    ctx->Const.MaxConvolutionWidth = MAX_CONVOLUTION_WIDTH;
 553    ctx->Const.MaxConvolutionHeight = MAX_CONVOLUTION_HEIGHT;
 554    ctx->Const.MaxClipPlanes = MAX_CLIP_PLANES;
 555    ctx->Const.MaxLights = MAX_LIGHTS;
 556    ctx->Const.MaxShininess = 128.0;
 557    ctx->Const.MaxSpotExponent = 128.0;
 558    ctx->Const.MaxViewportWidth = MAX_WIDTH;
 559    ctx->Const.MaxViewportHeight = MAX_HEIGHT;
 560 #if FEATURE_ARB_vertex_program
 561    init_program_limits(GL_VERTEX_PROGRAM_ARB, &ctx->Const.VertexProgram);
 562 #endif
 563 #if FEATURE_ARB_fragment_program
 564    init_program_limits(GL_FRAGMENT_PROGRAM_ARB, &ctx->Const.FragmentProgram);
 565 #endif
 566    ctx->Const.MaxProgramMatrices = MAX_PROGRAM_MATRICES;
 567    ctx->Const.MaxProgramMatrixStackDepth = MAX_PROGRAM_MATRIX_STACK_DEPTH;
 568
 569    /* CheckArrayBounds is overriden by drivers/x11 for X server */
 570    ctx->Const.CheckArrayBounds = GL_FALSE;
 571
 572    /* GL_ARB_draw_buffers */
 573    ctx->Const.MaxDrawBuffers = MAX_DRAW_BUFFERS;
 574
 575    /* GL_OES_read_format */
 576    ctx->Const.ColorReadFormat = GL_RGBA;
 577    ctx->Const.ColorReadType = GL_UNSIGNED_BYTE;
 578
 579 #if FEATURE_EXT_framebuffer_object
 580    ctx->Const.MaxColorAttachments = MAX_COLOR_ATTACHMENTS;
 581    ctx->Const.MaxRenderbufferSize = MAX_WIDTH;
 582 #endif
 583
 584 #if FEATURE_ARB_vertex_shader
 585    ctx->Const.MaxVertexTextureImageUnits = MAX_VERTEX_TEXTURE_IMAGE_UNITS;
 586    ctx->Const.MaxVarying = MAX_VARYING;
 587 #endif
 588
 589    /* GL_ARB_framebuffer_object */
 590    ctx->Const.MaxSamples = 0;
 591
 592    /* GL_ATI_envmap_bumpmap */
 593    ctx->Const.SupportedBumpUnits = SUPPORTED_ATI_BUMP_UNITS;
 594
 595    /* sanity checks */
 596    ASSERT(ctx->Const.MaxTextureUnits == MIN2(ctx->Const.MaxTextureImageUnits,
 597                                              ctx->Const.MaxTextureCoordUnits));
 598    ASSERT(ctx->Const.FragmentProgram.MaxLocalParams <= MAX_PROGRAM_LOCAL_PARAMS);
 599    ASSERT(ctx->Const.VertexProgram.MaxLocalParams <= MAX_PROGRAM_LOCAL_PARAMS);
 600
 601    ASSERT(MAX_NV_FRAGMENT_PROGRAM_TEMPS <= MAX_PROGRAM_TEMPS);
 602    ASSERT(MAX_NV_VERTEX_PROGRAM_TEMPS <= MAX_PROGRAM_TEMPS);
 603    ASSERT(MAX_NV_VERTEX_PROGRAM_INPUTS <= VERT_ATTRIB_MAX);
 604    ASSERT(MAX_NV_VERTEX_PROGRAM_OUTPUTS <= VERT_RESULT_MAX);
 605 }
 606
 607
 608 /**
 609  * Do some sanity checks on the limits/constants for the given context.
 610  * Only called the first time a context is bound.
 611  */
 612 static void
 613 check_context_limits(GLcontext *ctx)
 614 {
 615    /* Many context limits/constants are limited by the size of
 616     * internal arrays.
 617     */
 618    assert(ctx->Const.MaxTextureImageUnits <= MAX_TEXTURE_IMAGE_UNITS);
 619    assert(ctx->Const.MaxTextureCoordUnits <= MAX_TEXTURE_COORD_UNITS);
 620    assert(ctx->Const.MaxTextureUnits <= MAX_TEXTURE_IMAGE_UNITS);
 621    assert(ctx->Const.MaxTextureUnits <= MAX_TEXTURE_COORD_UNITS);
 622
 623    /* number of coord units cannot be greater than number of image units */
 624    assert(ctx->Const.MaxTextureCoordUnits <= ctx->Const.MaxTextureImageUnits);
 625
 626    assert(ctx->Const.MaxTextureLevels <= MAX_TEXTURE_LEVELS);
 627    assert(ctx->Const.Max3DTextureLevels <= MAX_3D_TEXTURE_LEVELS);
 628    assert(ctx->Const.MaxCubeTextureLevels <= MAX_CUBE_TEXTURE_LEVELS);
 629    assert(ctx->Const.MaxTextureRectSize <= MAX_TEXTURE_RECT_SIZE);
 630
 631    /* make sure largest texture image is <= MAX_WIDTH in size */
 632    assert((1 << (ctx->Const.MaxTextureLevels - 1)) <= MAX_WIDTH);
 633    assert((1 << (ctx->Const.MaxCubeTextureLevels - 1)) <= MAX_WIDTH);
 634    assert((1 << (ctx->Const.Max3DTextureLevels - 1)) <= MAX_WIDTH);
 635
 636    assert(ctx->Const.MaxViewportWidth <= MAX_WIDTH);
 637    assert(ctx->Const.MaxViewportHeight <= MAX_WIDTH);
 638
 639    assert(ctx->Const.MaxDrawBuffers <= MAX_DRAW_BUFFERS);
 640
 641    /* XXX probably add more tests */
 642 }
 643
 644
 645 /**
 646  * Initialize the attribute groups in a GL context.
 647  *
 648  * \param ctx GL context.
 649  *
 650  * Initializes all the attributes, calling the respective <tt>init*</tt>
 651  * functions for the more complex data structures.
 652  */
 653 static GLboolean
 654 init_attrib_groups(GLcontext *ctx)
 655 {
 656    assert(ctx);
 657
 658    /* Constants */
 659    _mesa_init_constants( ctx );
 660
 661    /* Extensions */
 662    _mesa_init_extensions( ctx );
 663
 664    /* Attribute Groups */
 665 #if FEATURE_accum
 666    _mesa_init_accum( ctx );
 667 #endif
 668 #if FEATURE_attrib_stack
 669    _mesa_init_attrib( ctx );
 670 #endif
 671    _mesa_init_buffer_objects( ctx );
 672    _mesa_init_color( ctx );
 673 #if FEATURE_colortable
 674    _mesa_init_colortables( ctx );
 675 #endif
 676    _mesa_init_current( ctx );
 677    _mesa_init_depth( ctx );
 678    _mesa_init_debug( ctx );
 679 #if FEATURE_dlist
 680    _mesa_init_display_list( ctx );
 681 #endif
 682 #if FEATURE_evaluators
 683    _mesa_init_eval( ctx );
 684 #endif
 685    _mesa_init_fbobjects( ctx );
 686 #if FEATURE_feedback
 687    _mesa_init_feedback( ctx );
 688 #else
 689    ctx->RenderMode = GL_RENDER;
 690 #endif
 691    _mesa_init_fog( ctx );
 692 #if FEATURE_histogram
 693    _mesa_init_histogram( ctx );
 694 #endif
 695    _mesa_init_hint( ctx );
 696    _mesa_init_line( ctx );
 697    _mesa_init_lighting( ctx );
 698    _mesa_init_matrix( ctx );
 699    _mesa_init_multisample( ctx );
 700    _mesa_init_pixel( ctx );
 701    _mesa_init_pixelstore( ctx );
 702    _mesa_init_point( ctx );
 703    _mesa_init_polygon( ctx );
 704    _mesa_init_program( ctx );
 705 #if FEATURE_ARB_occlusion_query
 706    _mesa_init_query( ctx );
 707 #endif
 708 #if FEATURE_drawpix
 709    _mesa_init_rastpos( ctx );
 710 #endif
 711    _mesa_init_scissor( ctx );
 712    _mesa_init_shader_state( ctx );
 713    _mesa_init_stencil( ctx );
 714    _mesa_init_transform( ctx );
 715    _mesa_init_varray( ctx );
 716    _mesa_init_viewport( ctx );
 717
 718    if (!_mesa_init_texture( ctx ))
 719       return GL_FALSE;
 720
 721 #if FEATURE_texture_s3tc
 722    _mesa_init_texture_s3tc( ctx );
 723 #endif
 724 #if FEATURE_texture_fxt1
 725    _mesa_init_texture_fxt1( ctx );
 726 #endif
 727
 728    /* Miscellaneous */
 729    ctx->NewState = _NEW_ALL;
 730    ctx->ErrorValue = (GLenum) GL_NO_ERROR;
 731    ctx->varying_vp_inputs = ~0;
 732
 733    return GL_TRUE;
 734 }
 735
 736
 737 /**
 738  * Update default objects in a GL context with respect to shared state.
 739  *
 740  * \param ctx GL context.
 741  *
 742  * Removes references to old default objects, (texture objects, program
 743  * objects, etc.) and changes to reference those from the current shared
 744  * state.
 745  */
 746 static GLboolean
 747 update_default_objects(GLcontext *ctx)
 748 {
 749    assert(ctx);
 750
 751    _mesa_update_default_objects_program(ctx);
 752    _mesa_update_default_objects_texture(ctx);
 753    _mesa_update_default_objects_buffer_objects(ctx);
 754
 755    return GL_TRUE;
 756 }
 757
 758
 759 /**
 760  * This is the default function we plug into all dispatch table slots
 761  * This helps prevents a segfault when someone calls a GL function without
 762  * first checking if the extension's supported.
 763  */
 764 static int
 765 generic_nop(void)
 766 {
 767    _mesa_warning(NULL, "User called no-op dispatch function (an unsupported extension function?)");
 768    return 0;
 769 }
 770
 771
 772 /**
 773  * Allocate and initialize a new dispatch table.
 774  */
 775 static struct _glapi_table *
 776 alloc_dispatch_table(void)
 777 {
 778    /* Find the larger of Mesa's dispatch table and libGL's dispatch table.
 779     * In practice, this'll be the same for stand-alone Mesa.  But for DRI
 780     * Mesa we do this to accomodate different versions of libGL and various
 781     * DRI drivers.
 782     */
 783    GLint numEntries = MAX2(_glapi_get_dispatch_table_size(),
 784                            sizeof(struct _glapi_table) / sizeof(_glapi_proc));
 785    struct _glapi_table *table =
 786       (struct _glapi_table *) _mesa_malloc(numEntries * sizeof(_glapi_proc));
 787    if (table) {
 788       _glapi_proc *entry = (_glapi_proc *) table;
 789       GLint i;
 790       for (i = 0; i < numEntries; i++) {
 791          entry[i] = (_glapi_proc) generic_nop;
 792       }
 793    }
 794    return table;
 795 }
 796
 797
 798 /**
 799  * Initialize a GLcontext struct (rendering context).
 800  *
 801  * This includes allocating all the other structs and arrays which hang off of
 802  * the context by pointers.
 803  * Note that the driver needs to pass in its dd_function_table here since
 804  * we need to at least call driverFunctions->NewTextureObject to create the
 805  * default texture objects.
 806  *
 807  * Called by _mesa_create_context().
 808  *
 809  * Performs the imports and exports callback tables initialization, and
 810  * miscellaneous one-time initializations. If no shared context is supplied one
 811  * is allocated, and increase its reference count.  Setups the GL API dispatch
 812  * tables.  Initialize the TNL module. Sets the maximum Z buffer depth.
 813  * Finally queries the \c MESA_DEBUG and \c MESA_VERBOSE environment variables
 814  * for debug flags.
 815  *
 816  * \param ctx the context to initialize
 817  * \param visual describes the visual attributes for this context
 818  * \param share_list points to context to share textures, display lists,
 819  *        etc with, or NULL
 820  * \param driverFunctions table of device driver functions for this context
 821  *        to use
 822  * \param driverContext pointer to driver-specific context data
 823  */
 824 GLboolean
 825 _mesa_initialize_context(GLcontext *ctx,
 826                          const GLvisual *visual,
 827                          GLcontext *share_list,
 828                          const struct dd_function_table *driverFunctions,
 829                          void *driverContext)
 830 {
 831    struct gl_shared_state *shared;
 832
 833    /*ASSERT(driverContext);*/
 834    assert(driverFunctions->NewTextureObject);
 835    assert(driverFunctions->FreeTexImageData);
 836
 837    /* misc one-time initializations */
 838    one_time_init(ctx);
 839
 840    ctx->Visual = *visual;
 841    ctx->DrawBuffer = NULL;
 842    ctx->ReadBuffer = NULL;
 843    ctx->WinSysDrawBuffer = NULL;
 844    ctx->WinSysReadBuffer = NULL;
 845
 846    /* Plug in driver functions and context pointer here.
 847     * This is important because when we call alloc_shared_state() below
 848     * we'll call ctx->Driver.NewTextureObject() to create the default
 849     * textures.
 850     */
 851    ctx->Driver = *driverFunctions;
 852    ctx->DriverCtx = driverContext;
 853
 854    if (share_list) {
 855       /* share state with another context */
 856       shared = share_list->Shared;
 857    }
 858    else {
 859       /* allocate new, unshared state */
 860       shared = _mesa_alloc_shared_state(ctx);
 861       if (!shared)
 862          return GL_FALSE;
 863    }
 864
 865    _glthread_LOCK_MUTEX(shared->Mutex);
 866    ctx->Shared = shared;
 867    shared->RefCount++;
 868    _glthread_UNLOCK_MUTEX(shared->Mutex);
 869
 870    if (!init_attrib_groups( ctx )) {
 871       _mesa_free_shared_state(ctx, ctx->Shared);
 872       return GL_FALSE;
 873    }
 874
 875    /* setup the API dispatch tables */
 876    ctx->Exec = alloc_dispatch_table();
 877    ctx->Save = alloc_dispatch_table();
 878    if (!ctx->Exec || !ctx->Save) {
 879       _mesa_free_shared_state(ctx, ctx->Shared);
 880       if (ctx->Exec)
 881          _mesa_free(ctx->Exec);
 882    }
 883 #if FEATURE_dispatch
 884    _mesa_init_exec_table(ctx->Exec);
 885 #endif
 886    ctx->CurrentDispatch = ctx->Exec;
 887 #if FEATURE_dlist
 888    _mesa_init_dlist_table(ctx->Save);
 889    _mesa_install_save_vtxfmt( ctx, &ctx->ListState.ListVtxfmt );
 890 #endif
 891    /* Neutral tnl module stuff */
 892    _mesa_init_exec_vtxfmt( ctx );
 893    ctx->TnlModule.Current = NULL;
 894    ctx->TnlModule.SwapCount = 0;
 895
 896    ctx->FragmentProgram._MaintainTexEnvProgram
 897       = (_mesa_getenv("MESA_TEX_PROG") != NULL);
 898
 899    ctx->VertexProgram._MaintainTnlProgram
 900       = (_mesa_getenv("MESA_TNL_PROG") != NULL);
 901    if (ctx->VertexProgram._MaintainTnlProgram) {
 902       /* this is required... */
 903       ctx->FragmentProgram._MaintainTexEnvProgram = GL_TRUE;
 904    }
 905
 906 #ifdef FEATURE_extra_context_init
 907    _mesa_initialize_context_extra(ctx);
 908 #endif
 909
 910    ctx->FirstTimeCurrent = GL_TRUE;
 911
 912    return GL_TRUE;
 913 }
 914
 915
 916 /**
 917  * Allocate and initialize a GLcontext structure.
 918  * Note that the driver needs to pass in its dd_function_table here since
 919  * we need to at least call driverFunctions->NewTextureObject to initialize
 920  * the rendering context.
 921  *
 922  * \param visual a GLvisual pointer (we copy the struct contents)
 923  * \param share_list another context to share display lists with or NULL
 924  * \param driverFunctions points to the dd_function_table into which the
 925  *        driver has plugged in all its special functions.
 926  * \param driverContext points to the device driver's private context state
 927  *
 928  * \return pointer to a new __GLcontextRec or NULL if error.
 929  */
 930 GLcontext *
 931 _mesa_create_context(const GLvisual *visual,
 932                      GLcontext *share_list,
 933                      const struct dd_function_table *driverFunctions,
 934                      void *driverContext)
 935 {
 936    GLcontext *ctx;
 937
 938    ASSERT(visual);
 939    /*ASSERT(driverContext);*/
 940
 941    ctx = (GLcontext *) _mesa_calloc(sizeof(GLcontext));
 942    if (!ctx)
 943       return NULL;
 944
 945    if (_mesa_initialize_context(ctx, visual, share_list,
 946                                 driverFunctions, driverContext)) {
 947       return ctx;
 948    }
 949    else {
 950       _mesa_free(ctx);
 951       return NULL;
 952    }
 953 }
 954
 955
 956 /**
 957  * Free the data associated with the given context.
 958  *
 959  * But doesn't free the GLcontext struct itself.
 960  *
 961  * \sa _mesa_initialize_context() and init_attrib_groups().
 962  */
 963 void
 964 _mesa_free_context_data( GLcontext *ctx )
 965 {
 966    GLint RefCount;
 967
 968    if (!_mesa_get_current_context()){
 969       /* No current context, but we may need one in order to delete
 970        * texture objs, etc.  So temporarily bind the context now.
 971        */
 972       _mesa_make_current(ctx, NULL, NULL);
 973    }
 974
 975    /* unreference WinSysDraw/Read buffers */
 976    _mesa_reference_framebuffer(&ctx->WinSysDrawBuffer, NULL);
 977    _mesa_reference_framebuffer(&ctx->WinSysReadBuffer, NULL);
 978    _mesa_reference_framebuffer(&ctx->DrawBuffer, NULL);
 979    _mesa_reference_framebuffer(&ctx->ReadBuffer, NULL);
 980
 981    _mesa_reference_vertprog(ctx, &ctx->VertexProgram.Current, NULL);
 982    _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current, NULL);
 983    _mesa_reference_vertprog(ctx, &ctx->VertexProgram._TnlProgram, NULL);
 984
 985    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram.Current, NULL);
 986    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current, NULL);
 987    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram, NULL);
 988
 989 #if FEATURE_attrib_stack
 990    _mesa_free_attrib_data(ctx);
 991 #endif
 992    _mesa_free_lighting_data( ctx );
 993 #if FEATURE_evaluators
 994    _mesa_free_eval_data( ctx );
 995 #endif
 996    _mesa_free_texture_data( ctx );
 997    _mesa_free_matrix_data( ctx );
 998    _mesa_free_viewport_data( ctx );
 999 #if FEATURE_colortable
1000    _mesa_free_colortables_data( ctx );
1001 #endif
1002    _mesa_free_program_data(ctx);
1003    _mesa_free_shader_state(ctx);
1004 #if FEATURE_ARB_occlusion_query
1005    _mesa_free_query_data(ctx);
1006 #endif
1007
1008    _mesa_delete_array_object(ctx, ctx->Array.DefaultArrayObj);
1009
1010 #if FEATURE_ARB_pixel_buffer_object
1011    _mesa_reference_buffer_object(ctx, &ctx->Pack.BufferObj, NULL);
1012    _mesa_reference_buffer_object(ctx, &ctx->Unpack.BufferObj, NULL);
1013 #endif
1014
1015 #if FEATURE_ARB_vertex_buffer_object
1016    _mesa_reference_buffer_object(ctx, &ctx->Array.ArrayBufferObj, NULL);
1017    _mesa_reference_buffer_object(ctx, &ctx->Array.ElementArrayBufferObj, NULL);
1018 #endif
1019
1020 #if FEATURE_ARB_vertex_buffer_object
1021    _mesa_delete_buffer_object(ctx, ctx->Array.NullBufferObj);
1022 #endif
1023
1024    /* free dispatch tables */
1025    _mesa_free(ctx->Exec);
1026    _mesa_free(ctx->Save);
1027
1028    /* Shared context state (display lists, textures, etc) */
1029    _glthread_LOCK_MUTEX(ctx->Shared->Mutex);
1030    RefCount = --ctx->Shared->RefCount;
1031    _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
1032    assert(RefCount >= 0);
1033    if (RefCount == 0) {
1034       /* free shared state */
1035       _mesa_free_shared_state( ctx, ctx->Shared );
1036    }
1037
1038    if (ctx->Extensions.String)
1039       _mesa_free((void *) ctx->Extensions.String);
1040
1041    /* unbind the context if it's currently bound */
1042    if (ctx == _mesa_get_current_context()) {
1043       _mesa_make_current(NULL, NULL, NULL);
1044    }
1045 }
1046
1047
1048 /**
1049  * Destroy a GLcontext structure.
1050  *
1051  * \param ctx GL context.
1052  *
1053  * Calls _mesa_free_context_data() and frees the GLcontext structure itself.
1054  */
1055 void
1056 _mesa_destroy_context( GLcontext *ctx )
1057 {
1058    if (ctx) {
1059       _mesa_free_context_data(ctx);
1060       _mesa_free( (void *) ctx );
1061    }
1062 }
1063
1064
1065 #if _HAVE_FULL_GL
1066 /**
1067  * Copy attribute groups from one context to another.
1068  *
1069  * \param src source context
1070  * \param dst destination context
1071  * \param mask bitwise OR of GL_*_BIT flags
1072  *
1073  * According to the bits specified in \p mask, copies the corresponding
1074  * attributes from \p src into \p dst.  For many of the attributes a simple \c
1075  * memcpy is not enough due to the existence of internal pointers in their data
1076  * structures.
1077  */
1078 void
1079 _mesa_copy_context( const GLcontext *src, GLcontext *dst, GLuint mask )
1080 {
1081    if (mask & GL_ACCUM_BUFFER_BIT) {
1082       /* OK to memcpy */
1083       dst->Accum = src->Accum;
1084    }
1085    if (mask & GL_COLOR_BUFFER_BIT) {
1086       /* OK to memcpy */
1087       dst->Color = src->Color;
1088    }
1089    if (mask & GL_CURRENT_BIT) {
1090       /* OK to memcpy */
1091       dst->Current = src->Current;
1092    }
1093    if (mask & GL_DEPTH_BUFFER_BIT) {
1094       /* OK to memcpy */
1095       dst->Depth = src->Depth;
1096    }
1097    if (mask & GL_ENABLE_BIT) {
1098       /* no op */
1099    }
1100    if (mask & GL_EVAL_BIT) {
1101       /* OK to memcpy */
1102       dst->Eval = src->Eval;
1103    }
1104    if (mask & GL_FOG_BIT) {
1105       /* OK to memcpy */
1106       dst->Fog = src->Fog;
1107    }
1108    if (mask & GL_HINT_BIT) {
1109       /* OK to memcpy */
1110       dst->Hint = src->Hint;
1111    }
1112    if (mask & GL_LIGHTING_BIT) {
1113       GLuint i;
1114       /* begin with memcpy */
1115       dst->Light = src->Light;
1116       /* fixup linked lists to prevent pointer insanity */
1117       make_empty_list( &(dst->Light.EnabledList) );
1118       for (i = 0; i < MAX_LIGHTS; i++) {
1119          if (dst->Light.Light[i].Enabled) {
1120             insert_at_tail(&(dst->Light.EnabledList), &(dst->Light.Light[i]));
1121          }
1122       }
1123    }
1124    if (mask & GL_LINE_BIT) {
1125       /* OK to memcpy */
1126       dst->Line = src->Line;
1127    }
1128    if (mask & GL_LIST_BIT) {
1129       /* OK to memcpy */
1130       dst->List = src->List;
1131    }
1132    if (mask & GL_PIXEL_MODE_BIT) {
1133       /* OK to memcpy */
1134       dst->Pixel = src->Pixel;
1135    }
1136    if (mask & GL_POINT_BIT) {
1137       /* OK to memcpy */
1138       dst->Point = src->Point;
1139    }
1140    if (mask & GL_POLYGON_BIT) {
1141       /* OK to memcpy */
1142       dst->Polygon = src->Polygon;
1143    }
1144    if (mask & GL_POLYGON_STIPPLE_BIT) {
1145       /* Use loop instead of MEMCPY due to problem with Portland Group's
1146        * C compiler.  Reported by John Stone.
1147        */
1148       GLuint i;
1149       for (i = 0; i < 32; i++) {
1150          dst->PolygonStipple[i] = src->PolygonStipple[i];
1151       }
1152    }
1153    if (mask & GL_SCISSOR_BIT) {
1154       /* OK to memcpy */
1155       dst->Scissor = src->Scissor;
1156    }
1157    if (mask & GL_STENCIL_BUFFER_BIT) {
1158       /* OK to memcpy */
1159       dst->Stencil = src->Stencil;
1160    }
1161    if (mask & GL_TEXTURE_BIT) {
1162       /* Cannot memcpy because of pointers */
1163       _mesa_copy_texture_state(src, dst);
1164    }
1165    if (mask & GL_TRANSFORM_BIT) {
1166       /* OK to memcpy */
1167       dst->Transform = src->Transform;
1168    }
1169    if (mask & GL_VIEWPORT_BIT) {
1170       /* Cannot use memcpy, because of pointers in GLmatrix _WindowMap */
1171       dst->Viewport.X = src->Viewport.X;
1172       dst->Viewport.Y = src->Viewport.Y;
1173       dst->Viewport.Width = src->Viewport.Width;
1174       dst->Viewport.Height = src->Viewport.Height;
1175       dst->Viewport.Near = src->Viewport.Near;
1176       dst->Viewport.Far = src->Viewport.Far;
1177       _math_matrix_copy(&dst->Viewport._WindowMap, &src->Viewport._WindowMap);
1178    }
1179
1180    /* XXX FIXME:  Call callbacks?
1181     */
1182    dst->NewState = _NEW_ALL;
1183 }
1184 #endif
1185
1186
1187 /**
1188  * Check if the given context can render into the given framebuffer
1189  * by checking visual attributes.
1190  *
1191  * Most of these tests could go away because Mesa is now pretty flexible
1192  * in terms of mixing rendering contexts with framebuffers.  As long
1193  * as RGB vs. CI mode agree, we're probably good.
1194  *
1195  * \return GL_TRUE if compatible, GL_FALSE otherwise.
1196  */
1197 static GLboolean
1198 check_compatible(const GLcontext *ctx, const GLframebuffer *buffer)
1199 {
1200    const GLvisual *ctxvis = &ctx->Visual;
1201    const GLvisual *bufvis = &buffer->Visual;
1202
1203    if (ctxvis == bufvis)
1204       return GL_TRUE;
1205
1206    if (ctxvis->rgbMode != bufvis->rgbMode)
1207       return GL_FALSE;
1208 #if 0
1209    /* disabling this fixes the fgl_glxgears pbuffer demo */
1210    if (ctxvis->doubleBufferMode && !bufvis->doubleBufferMode)
1211       return GL_FALSE;
1212 #endif
1213    if (ctxvis->stereoMode && !bufvis->stereoMode)
1214       return GL_FALSE;
1215    if (ctxvis->haveAccumBuffer && !bufvis->haveAccumBuffer)
1216       return GL_FALSE;
1217    if (ctxvis->haveDepthBuffer && !bufvis->haveDepthBuffer)
1218       return GL_FALSE;
1219    if (ctxvis->haveStencilBuffer && !bufvis->haveStencilBuffer)
1220       return GL_FALSE;
1221    if (ctxvis->redMask && ctxvis->redMask != bufvis->redMask)
1222       return GL_FALSE;
1223    if (ctxvis->greenMask && ctxvis->greenMask != bufvis->greenMask)
1224       return GL_FALSE;
1225    if (ctxvis->blueMask && ctxvis->blueMask != bufvis->blueMask)
1226       return GL_FALSE;
1227 #if 0
1228    /* disabled (see bug 11161) */
1229    if (ctxvis->depthBits && ctxvis->depthBits != bufvis->depthBits)
1230       return GL_FALSE;
1231 #endif
1232    if (ctxvis->stencilBits && ctxvis->stencilBits != bufvis->stencilBits)
1233       return GL_FALSE;
1234
1235    return GL_TRUE;
1236 }
1237
1238
1239 /**
1240  * Do one-time initialization for the given framebuffer.  Specifically,
1241  * ask the driver for the window's current size and update the framebuffer
1242  * object to match.
1243  * Really, the device driver should totally take care of this.
1244  */
1245 static void
1246 initialize_framebuffer_size(GLcontext *ctx, GLframebuffer *fb)
1247 {
1248    GLuint width, height;
1249    if (ctx->Driver.GetBufferSize) {
1250       ctx->Driver.GetBufferSize(fb, &width, &height);
1251       if (ctx->Driver.ResizeBuffers)
1252          ctx->Driver.ResizeBuffers(ctx, fb, width, height);
1253       fb->Initialized = GL_TRUE;
1254    }
1255 }
1256
1257
1258 /**
1259  * Check if the viewport/scissor size has not yet been initialized.
1260  * Initialize the size if the given width and height are non-zero.
1261  */
1262 void
1263 _mesa_check_init_viewport(GLcontext *ctx, GLuint width, GLuint height)
1264 {
1265    if (!ctx->ViewportInitialized && width > 0 && height > 0) {
1266       /* Note: set flag here, before calling _mesa_set_viewport(), to prevent
1267        * potential infinite recursion.
1268        */
1269       ctx->ViewportInitialized = GL_TRUE;
1270       _mesa_set_viewport(ctx, 0, 0, width, height);
1271       _mesa_set_scissor(ctx, 0, 0, width, height);
1272    }
1273 }
1274
1275
1276 /**
1277  * Bind the given context to the given drawBuffer and readBuffer and
1278  * make it the current context for the calling thread.
1279  * We'll render into the drawBuffer and read pixels from the
1280  * readBuffer (i.e. glRead/CopyPixels, glCopyTexImage, etc).
1281  *
1282  * We check that the context's and framebuffer's visuals are compatible
1283  * and return immediately if they're not.
1284  *
1285  * \param newCtx  the new GL context. If NULL then there will be no current GL
1286  *                context.
1287  * \param drawBuffer  the drawing framebuffer
1288  * \param readBuffer  the reading framebuffer
1289  */
1290 GLboolean
1291 _mesa_make_current( GLcontext *newCtx, GLframebuffer *drawBuffer,
1292                     GLframebuffer *readBuffer )
1293 {
1294    if (MESA_VERBOSE & VERBOSE_API)
1295       _mesa_debug(newCtx, "_mesa_make_current()\n");
1296
1297    /* Check that the context's and framebuffer's visuals are compatible.
1298     */
1299    if (newCtx && drawBuffer && newCtx->WinSysDrawBuffer != drawBuffer) {
1300       if (!check_compatible(newCtx, drawBuffer)) {
1301          _mesa_warning(newCtx,
1302               "MakeCurrent: incompatible visuals for context and drawbuffer");
1303          return GL_FALSE;
1304       }
1305    }
1306    if (newCtx && readBuffer && newCtx->WinSysReadBuffer != readBuffer) {
1307       if (!check_compatible(newCtx, readBuffer)) {
1308          _mesa_warning(newCtx,
1309               "MakeCurrent: incompatible visuals for context and readbuffer");
1310          return GL_FALSE;
1311       }
1312    }
1313
1314    /* We used to call _glapi_check_multithread() here.  Now do it in drivers */
1315    _glapi_set_context((void *) newCtx);
1316    ASSERT(_mesa_get_current_context() == newCtx);
1317
1318    if (!newCtx) {
1319       _glapi_set_dispatch(NULL);  /* none current */
1320    }
1321    else {
1322       _glapi_set_dispatch(newCtx->CurrentDispatch);
1323
1324       if (drawBuffer && readBuffer) {
1325          /* TODO: check if newCtx and buffer's visual match??? */
1326
1327          ASSERT(drawBuffer->Name == 0);
1328          ASSERT(readBuffer->Name == 0);
1329          _mesa_reference_framebuffer(&newCtx->WinSysDrawBuffer, drawBuffer);
1330          _mesa_reference_framebuffer(&newCtx->WinSysReadBuffer, readBuffer);
1331
1332          /*
1333           * Only set the context's Draw/ReadBuffer fields if they're NULL
1334           * or not bound to a user-created FBO.
1335           */
1336          if (!newCtx->DrawBuffer || newCtx->DrawBuffer->Name == 0) {
1337             /* KW: merge conflict here, revisit.
1338              */
1339             /* fix up the fb fields - these will end up wrong otherwise
1340              * if the DRIdrawable changes, and everything relies on them.
1341              * This is a bit messy (same as needed in _mesa_BindFramebufferEXT)
1342              */
1343             unsigned int i;
1344             GLenum buffers[MAX_DRAW_BUFFERS];
1345
1346             _mesa_reference_framebuffer(&newCtx->DrawBuffer, drawBuffer);
1347
1348             for(i = 0; i < newCtx->Const.MaxDrawBuffers; i++) {
1349                buffers[i] = newCtx->Color.DrawBuffer[i];
1350             }
1351
1352             _mesa_drawbuffers(newCtx, newCtx->Const.MaxDrawBuffers, buffers, NULL);
1353          }
1354          if (!newCtx->ReadBuffer || newCtx->ReadBuffer->Name == 0) {
1355             _mesa_reference_framebuffer(&newCtx->ReadBuffer, readBuffer);
1356          }
1357
1358          /* XXX only set this flag if we're really changing the draw/read
1359           * framebuffer bindings.
1360           */
1361          newCtx->NewState |= _NEW_BUFFERS;
1362
1363 #if 1
1364          /* We want to get rid of these lines: */
1365
1366 #if _HAVE_FULL_GL
1367          if (!drawBuffer->Initialized) {
1368             initialize_framebuffer_size(newCtx, drawBuffer);
1369          }
1370          if (readBuffer != drawBuffer && !readBuffer->Initialized) {
1371             initialize_framebuffer_size(newCtx, readBuffer);
1372          }
1373
1374          _mesa_resizebuffers(newCtx);
1375 #endif
1376
1377 #else
1378          /* We want the drawBuffer and readBuffer to be initialized by
1379           * the driver.
1380           * This generally means the Width and Height match the actual
1381           * window size and the renderbuffers (both hardware and software
1382           * based) are allocated to match.  The later can generally be
1383           * done with a call to _mesa_resize_framebuffer().
1384           *
1385           * It's theoretically possible for a buffer to have zero width
1386           * or height, but for now, assert check that the driver did what's
1387           * expected of it.
1388           */
1389          ASSERT(drawBuffer->Width > 0);
1390          ASSERT(drawBuffer->Height > 0);
1391 #endif
1392
1393          if (drawBuffer) {
1394             _mesa_check_init_viewport(newCtx,
1395                                       drawBuffer->Width, drawBuffer->Height);
1396          }
1397       }
1398
1399       if (newCtx->FirstTimeCurrent) {
1400          check_context_limits(newCtx);
1401
1402          /* We can use this to help debug user's problems.  Tell them to set
1403           * the MESA_INFO env variable before running their app.  Then the
1404           * first time each context is made current we'll print some useful
1405           * information.
1406           */
1407          if (_mesa_getenv("MESA_INFO")) {
1408             _mesa_print_info();
1409          }
1410
1411          newCtx->FirstTimeCurrent = GL_FALSE;
1412       }
1413    }
1414
1415    return GL_TRUE;
1416 }
1417
1418
1419 /**
1420  * Make context 'ctx' share the display lists, textures and programs
1421  * that are associated with 'ctxToShare'.
1422  * Any display lists, textures or programs associated with 'ctx' will
1423  * be deleted if nobody else is sharing them.
1424  */
1425 GLboolean
1426 _mesa_share_state(GLcontext *ctx, GLcontext *ctxToShare)
1427 {
1428    if (ctx && ctxToShare && ctx->Shared && ctxToShare->Shared) {
1429       struct gl_shared_state *oldSharedState = ctx->Shared;
1430       GLint RefCount;
1431
1432       ctx->Shared = ctxToShare->Shared;
1433
1434       _glthread_LOCK_MUTEX(ctx->Shared->Mutex);
1435       ctx->Shared->RefCount++;
1436       _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
1437
1438       update_default_objects(ctx);
1439
1440       _glthread_LOCK_MUTEX(oldSharedState->Mutex);
1441       RefCount = --oldSharedState->RefCount;
1442       _glthread_UNLOCK_MUTEX(oldSharedState->Mutex);
1443
1444       if (RefCount == 0) {
1445          _mesa_free_shared_state(ctx, oldSharedState);
1446       }
1447
1448       return GL_TRUE;
1449    }
1450    else {
1451       return GL_FALSE;
1452    }
1453 }
1454
1455
1456
1457 /**
1458  * \return pointer to the current GL context for this thread.
1459  *
1460  * Calls _glapi_get_context(). This isn't the fastest way to get the current
1461  * context.  If you need speed, see the #GET_CURRENT_CONTEXT macro in
1462  * context.h.
1463  */
1464 GLcontext *
1465 _mesa_get_current_context( void )
1466 {
1467    return (GLcontext *) _glapi_get_context();
1468 }
1469
1470
1471 /**
1472  * Get context's current API dispatch table.
1473  *
1474  * It'll either be the immediate-mode execute dispatcher or the display list
1475  * compile dispatcher.
1476  *
1477  * \param ctx GL context.
1478  *
1479  * \return pointer to dispatch_table.
1480  *
1481  * Simply returns __GLcontextRec::CurrentDispatch.
1482  */
1483 struct _glapi_table *
1484 _mesa_get_dispatch(GLcontext *ctx)
1485 {
1486    return ctx->CurrentDispatch;
1487 }
1488
1489 /*@}*/
1490
1491
1492 /**********************************************************************/
1493 /** \name Miscellaneous functions                                     */
1494 /**********************************************************************/
1495 /*@{*/
1496
1497 /**
1498  * Record an error.
1499  *
1500  * \param ctx GL context.
1501  * \param error error code.
1502  *
1503  * Records the given error code and call the driver's dd_function_table::Error
1504  * function if defined.
1505  *
1506  * \sa
1507  * This is called via _mesa_error().
1508  */
1509 void
1510 _mesa_record_error(GLcontext *ctx, GLenum error)
1511 {
1512    if (!ctx)
1513       return;
1514
1515    if (ctx->ErrorValue == GL_NO_ERROR) {
1516       ctx->ErrorValue = error;
1517    }
1518
1519    /* Call device driver's error handler, if any.  This is used on the Mac. */
1520    if (ctx->Driver.Error) {
1521       ctx->Driver.Error(ctx);
1522    }
1523 }
1524
1525
1526 /**
1527  * Execute glFinish().
1528  *
1529  * Calls the #ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH macro and the
1530  * dd_function_table::Finish driver callback, if not NULL.
1531  */
1532 void GLAPIENTRY
1533 _mesa_Finish(void)
1534 {
1535    GET_CURRENT_CONTEXT(ctx);
1536    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
1537    FLUSH_CURRENT( ctx, 0 );
1538    if (ctx->Driver.Finish) {
1539       ctx->Driver.Finish(ctx);
1540    }
1541 }
1542
1543
1544 /**
1545  * Execute glFlush().
1546  *
1547  * Calls the #ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH macro and the
1548  * dd_function_table::Flush driver callback, if not NULL.
1549  */
1550 void GLAPIENTRY
1551 _mesa_Flush(void)
1552 {
1553    GET_CURRENT_CONTEXT(ctx);
1554    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
1555    FLUSH_CURRENT( ctx, 0 );
1556    if (ctx->Driver.Flush) {
1557       ctx->Driver.Flush(ctx);
1558    }
1559 }
1560
1561
1562 /**
1563  * Set mvp_with_dp4 flag.  If a driver has a preference for DP4 over
1564  * MUL/MAD, or vice versa, call this function to register that.
1565  * Otherwise we default to MUL/MAD.
1566  */
1567 void
1568 _mesa_set_mvp_with_dp4( GLcontext *ctx,
1569                         GLboolean flag )
1570 {
1571    ctx->mvp_with_dp4 = flag;
1572 }
1573
1574
1575 /*@}*/