src/mesa/main/context.c

   1 /* $Id: context.c,v 1.44 2000/03/03 17:47:39 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.3
   6  *
   7  * Copyright (C) 1999-2000  Brian Paul   All Rights Reserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included
  17  * in all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  23  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  24  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  */
  26
  27
  28 #ifdef PC_HEADER
  29 #include "all.h"
  30 #else
  31 #include "glheader.h"
  32 #include "accum.h"
  33 #include "alphabuf.h"
  34 #include "clip.h"
  35 #include "context.h"
  36 #include "cva.h"
  37 #include "depth.h"
  38 #include "dlist.h"
  39 #include "eval.h"
  40 #include "enums.h"
  41 #include "extensions.h"
  42 #include "fog.h"
  43 #include "get.h"
  44 #include "glapi.h"
  45 #include "glapinoop.h"
  46 #include "glthread.h"
  47 #include "hash.h"
  48 #include "light.h"
  49 #include "macros.h"
  50 #include "matrix.h"
  51 #include "mem.h"
  52 #include "mmath.h"
  53 #include "pb.h"
  54 #include "pipeline.h"
  55 #include "shade.h"
  56 #include "simple_list.h"
  57 #include "stencil.h"
  58 #include "stages.h"
  59 #include "state.h"
  60 #include "translate.h"
  61 #include "teximage.h"
  62 #include "texobj.h"
  63 #include "texstate.h"
  64 #include "texture.h"
  65 #include "types.h"
  66 #include "varray.h"
  67 #include "vb.h"
  68 #include "vbcull.h"
  69 #include "vbrender.h"
  70 #include "vbxform.h"
  71 #include "vertices.h"
  72 #include "xform.h"
  73 #endif
  74
  75
  76
  77 /**********************************************************************/
  78 /*****                  Context and Thread management             *****/
  79 /**********************************************************************/
  80
  81
  82 #if !defined(THREADS)
  83
  84 struct immediate *_mesa_CurrentInput = NULL;
  85
  86 #endif
  87
  88
  89
  90
  91 /**********************************************************************/
  92 /*****                   Profiling functions                      *****/
  93 /**********************************************************************/
  94
  95 #ifdef PROFILE
  96
  97 #include <sys/times.h>
  98 #include <sys/param.h>
  99
 100
 101 /*
 102  * Return system time in seconds.
 103  * NOTE:  this implementation may not be very portable!
 104  */
 105 GLdouble gl_time( void )
 106 {
 107    static GLdouble prev_time = 0.0;
 108    static GLdouble time;
 109    struct tms tm;
 110    clock_t clk;
 111
 112    clk = times(&tm);
 113
 114 #ifdef CLK_TCK
 115    time = (double)clk / (double)CLK_TCK;
 116 #else
 117    time = (double)clk / (double)HZ;
 118 #endif
 119
 120    if (time>prev_time) {
 121       prev_time = time;
 122       return time;
 123    }
 124    else {
 125       return prev_time;
 126    }
 127 }
 128
 129 /*
 130  * Reset the timing/profiling counters
 131  */
 132 static void init_timings( GLcontext *ctx )
 133 {
 134    ctx->BeginEndCount = 0;
 135    ctx->BeginEndTime = 0.0;
 136    ctx->VertexCount = 0;
 137    ctx->VertexTime = 0.0;
 138    ctx->PointCount = 0;
 139    ctx->PointTime = 0.0;
 140    ctx->LineCount = 0;
 141    ctx->LineTime = 0.0;
 142    ctx->PolygonCount = 0;
 143    ctx->PolygonTime = 0.0;
 144    ctx->ClearCount = 0;
 145    ctx->ClearTime = 0.0;
 146    ctx->SwapCount = 0;
 147    ctx->SwapTime = 0.0;
 148 }
 149
 150
 151 /*
 152  * Print the accumulated timing/profiling data.
 153  */
 154 static void print_timings( GLcontext *ctx )
 155 {
 156    GLdouble beginendrate;
 157    GLdouble vertexrate;
 158    GLdouble pointrate;
 159    GLdouble linerate;
 160    GLdouble polygonrate;
 161    GLdouble overhead;
 162    GLdouble clearrate;
 163    GLdouble swaprate;
 164    GLdouble avgvertices;
 165
 166    if (ctx->BeginEndTime>0.0) {
 167       beginendrate = ctx->BeginEndCount / ctx->BeginEndTime;
 168    }
 169    else {
 170       beginendrate = 0.0;
 171    }
 172    if (ctx->VertexTime>0.0) {
 173       vertexrate = ctx->VertexCount / ctx->VertexTime;
 174    }
 175    else {
 176       vertexrate = 0.0;
 177    }
 178    if (ctx->PointTime>0.0) {
 179       pointrate = ctx->PointCount / ctx->PointTime;
 180    }
 181    else {
 182       pointrate = 0.0;
 183    }
 184    if (ctx->LineTime>0.0) {
 185       linerate = ctx->LineCount / ctx->LineTime;
 186    }
 187    else {
 188       linerate = 0.0;
 189    }
 190    if (ctx->PolygonTime>0.0) {
 191       polygonrate = ctx->PolygonCount / ctx->PolygonTime;
 192    }
 193    else {
 194       polygonrate = 0.0;
 195    }
 196    if (ctx->ClearTime>0.0) {
 197       clearrate = ctx->ClearCount / ctx->ClearTime;
 198    }
 199    else {
 200       clearrate = 0.0;
 201    }
 202    if (ctx->SwapTime>0.0) {
 203       swaprate = ctx->SwapCount / ctx->SwapTime;
 204    }
 205    else {
 206       swaprate = 0.0;
 207    }
 208
 209    if (ctx->BeginEndCount>0) {
 210       avgvertices = (GLdouble) ctx->VertexCount / (GLdouble) ctx->BeginEndCount;
 211    }
 212    else {
 213       avgvertices = 0.0;
 214    }
 215
 216    overhead = ctx->BeginEndTime - ctx->VertexTime - ctx->PointTime
 217               - ctx->LineTime - ctx->PolygonTime;
 218
 219
 220    printf("                          Count   Time (s)    Rate (/s) \n");
 221    printf("--------------------------------------------------------\n");
 222    printf("glBegin/glEnd           %7d  %8.3f   %10.3f\n",
 223           ctx->BeginEndCount, ctx->BeginEndTime, beginendrate);
 224    printf("  vertexes transformed  %7d  %8.3f   %10.3f\n",
 225           ctx->VertexCount, ctx->VertexTime, vertexrate );
 226    printf("  points rasterized     %7d  %8.3f   %10.3f\n",
 227           ctx->PointCount, ctx->PointTime, pointrate );
 228    printf("  lines rasterized      %7d  %8.3f   %10.3f\n",
 229           ctx->LineCount, ctx->LineTime, linerate );
 230    printf("  polygons rasterized   %7d  %8.3f   %10.3f\n",
 231           ctx->PolygonCount, ctx->PolygonTime, polygonrate );
 232    printf("  overhead                       %8.3f\n", overhead );
 233    printf("glClear                 %7d  %8.3f   %10.3f\n",
 234           ctx->ClearCount, ctx->ClearTime, clearrate );
 235    printf("SwapBuffers             %7d  %8.3f   %10.3f\n",
 236           ctx->SwapCount, ctx->SwapTime, swaprate );
 237    printf("\n");
 238
 239    printf("Average number of vertices per begin/end: %8.3f\n", avgvertices );
 240 }
 241 #endif
 242
 243
 244
 245
 246
 247 /**********************************************************************/
 248 /***** GL Visual allocation/destruction                           *****/
 249 /**********************************************************************/
 250
 251
 252 /*
 253  * Allocate a new GLvisual object.
 254  * Input:  rgbFlag - GL_TRUE=RGB(A) mode, GL_FALSE=Color Index mode
 255  *         alphaFlag - alloc software alpha buffers?
 256  *         dbFlag - double buffering?
 257  *         stereoFlag - stereo buffer?
 258  *         depthBits - requested bits per depth buffer value
 259  *                     Any value in [0, 32] is acceptable but the actual
 260  *                     depth type will be GLushort or GLuint as needed.
 261  *         stencilBits - requested minimum bits per stencil buffer value
 262  *         accumBits - requested minimum bits per accum buffer component
 263  *         indexBits - number of bits per pixel if rgbFlag==GL_FALSE
 264  *         red/green/blue/alphaBits - number of bits per color component
 265  *                                    in frame buffer for RGB(A) mode.
 266  *                                    We always use 8 in core Mesa though.
 267  * Return:  pointer to new GLvisual or NULL if requested parameters can't
 268  *          be met.
 269  */
 270 GLvisual *gl_create_visual( GLboolean rgbFlag,
 271                             GLboolean alphaFlag,
 272                             GLboolean dbFlag,
 273                             GLboolean stereoFlag,
 274                             GLint depthBits,
 275                             GLint stencilBits,
 276                             GLint accumBits,
 277                             GLint indexBits,
 278                             GLint redBits,
 279                             GLint greenBits,
 280                             GLint blueBits,
 281                             GLint alphaBits )
 282 {
 283    GLvisual *vis;
 284
 285    /* This is to catch bad values from device drivers not updated for
 286     * Mesa 3.3.  Some device drivers just passed 1.  That's a REALLY
 287     * bad value now (a 1-bit depth buffer!?!).
 288     */
 289    assert(depthBits == 0 || depthBits > 1);
 290
 291    if (depthBits < 0 || depthBits > 32) {
 292       return NULL;
 293    }
 294    if (stencilBits < 0 || stencilBits > (GLint) (8 * sizeof(GLstencil))) {
 295       return NULL;
 296    }
 297    if (accumBits < 0 || accumBits > (GLint) (8 * sizeof(GLaccum))) {
 298       return NULL;
 299    }
 300
 301    vis = (GLvisual *) CALLOC( sizeof(GLvisual) );
 302    if (!vis) {
 303       return NULL;
 304    }
 305
 306    vis->RGBAflag   = rgbFlag;
 307    vis->DBflag     = dbFlag;
 308    vis->StereoFlag = stereoFlag;
 309    vis->RedBits    = redBits;
 310    vis->GreenBits  = greenBits;
 311    vis->BlueBits   = blueBits;
 312    vis->AlphaBits  = alphaFlag ? (8 * sizeof(GLubyte)) : alphaBits;
 313
 314    vis->IndexBits   = indexBits;
 315    vis->DepthBits   = depthBits;
 316    vis->AccumBits   = (accumBits > 0) ? (8 * sizeof(GLaccum)) : 0;
 317    vis->StencilBits = (stencilBits > 0) ? (8 * sizeof(GLstencil)) : 0;
 318
 319    vis->SoftwareAlpha = alphaFlag;
 320
 321    if (depthBits == 0) {
 322       /* Special case.  Even if we don't have a depth buffer we need
 323        * good values for DepthMax for Z vertex transformation purposes.
 324        */
 325       vis->DepthMax = 1;
 326       vis->DepthMaxF = 1.0F;
 327    }
 328    else {
 329       vis->DepthMax = (1 << depthBits) - 1;
 330       vis->DepthMaxF = (GLfloat) vis->DepthMax;
 331    }
 332
 333    return vis;
 334 }
 335
 336
 337
 338 void gl_destroy_visual( GLvisual *vis )
 339 {
 340    FREE( vis );
 341 }
 342
 343
 344
 345 /**********************************************************************/
 346 /***** GL Framebuffer allocation/destruction                      *****/
 347 /**********************************************************************/
 348
 349
 350 /*
 351  * Create a new framebuffer.  A GLframebuffer is a struct which
 352  * encapsulates the depth, stencil and accum buffers and related
 353  * parameters.
 354  * Input:  visual - a GLvisual pointer
 355  *         softwareDepth - create/use a software depth buffer?
 356  *         softwareStencil - create/use a software stencil buffer?
 357  *         softwareAccum - create/use a software accum buffer?
 358  *         softwareAlpha - create/use a software alpha buffer?
 359
 360  * Return:  pointer to new GLframebuffer struct or NULL if error.
 361  */
 362 GLframebuffer *gl_create_framebuffer( GLvisual *visual,
 363                                       GLboolean softwareDepth,
 364                                       GLboolean softwareStencil,
 365                                       GLboolean softwareAccum,
 366                                       GLboolean softwareAlpha )
 367 {
 368    GLframebuffer *buffer;
 369
 370    buffer = CALLOC_STRUCT(gl_frame_buffer);
 371    if (!buffer) {
 372       return NULL;
 373    }
 374
 375    /* sanity checks */
 376    if (softwareDepth ) {
 377       assert(visual->DepthBits > 0);
 378    }
 379    if (softwareStencil) {
 380       assert(visual->StencilBits > 0);
 381    }
 382    if (softwareAccum) {
 383       assert(visual->RGBAflag);
 384       assert(visual->AccumBits > 0);
 385    }
 386    if (softwareAlpha) {
 387       assert(visual->RGBAflag);
 388       assert(visual->AlphaBits > 0);
 389    }
 390
 391    buffer->Visual = visual;
 392    buffer->UseSoftwareDepthBuffer = softwareDepth;
 393    buffer->UseSoftwareStencilBuffer = softwareStencil;
 394    buffer->UseSoftwareAccumBuffer = softwareAccum;
 395    buffer->UseSoftwareAlphaBuffers = softwareAlpha;
 396
 397    return buffer;
 398 }
 399
 400
 401
 402 /*
 403  * Free a framebuffer struct and its buffers.
 404  */
 405 void gl_destroy_framebuffer( GLframebuffer *buffer )
 406 {
 407    if (buffer) {
 408       if (buffer->Depth) {
 409          FREE( buffer->Depth );
 410       }
 411       if (buffer->Accum) {
 412          FREE( buffer->Accum );
 413       }
 414       if (buffer->Stencil) {
 415          FREE( buffer->Stencil );
 416       }
 417       if (buffer->FrontLeftAlpha) {
 418          FREE( buffer->FrontLeftAlpha );
 419       }
 420       if (buffer->BackLeftAlpha) {
 421          FREE( buffer->BackLeftAlpha );
 422       }
 423       if (buffer->FrontRightAlpha) {
 424          FREE( buffer->FrontRightAlpha );
 425       }
 426       if (buffer->BackRightAlpha) {
 427          FREE( buffer->BackRightAlpha );
 428       }
 429       FREE(buffer);
 430    }
 431 }
 432
 433
 434
 435 /**********************************************************************/
 436 /*****       Context allocation, initialization, destroying       *****/
 437 /**********************************************************************/
 438
 439
 440 _glthread_DECLARE_STATIC_MUTEX(OneTimeLock);
 441
 442
 443 /*
 444  * This function just calls all the various one-time-init functions in Mesa.
 445  */
 446 static void one_time_init( void )
 447 {
 448    static GLboolean alreadyCalled = GL_FALSE;
 449    _glthread_LOCK_MUTEX(OneTimeLock);
 450    if (!alreadyCalled) {
 451       /* do some implementation tests */
 452       assert( sizeof(GLbyte) == 1 );
 453       assert( sizeof(GLshort) >= 2 );
 454       assert( sizeof(GLint) >= 4 );
 455       assert( sizeof(GLubyte) == 1 );
 456       assert( sizeof(GLushort) >= 2 );
 457       assert( sizeof(GLuint) >= 4 );
 458
 459       gl_init_clip();
 460       gl_init_eval();
 461       _mesa_init_fog();
 462       gl_init_math();
 463       gl_init_lists();
 464       gl_init_shade();
 465       gl_init_texture();
 466       gl_init_transformation();
 467       gl_init_translate();
 468       gl_init_vbrender();
 469       gl_init_vbxform();
 470       gl_init_vertices();
 471
 472       if (getenv("MESA_DEBUG")) {
 473          _glapi_noop_enable_warnings(GL_TRUE);
 474       }
 475       else {
 476          _glapi_noop_enable_warnings(GL_FALSE);
 477       }
 478
 479 #if defined(DEBUG) && defined(__DATE__) && defined(__TIME__)
 480    fprintf(stderr, "Mesa DEBUG build %s %s\n", __DATE__, __TIME__);
 481 #endif
 482
 483       alreadyCalled = GL_TRUE;
 484    }
 485    _glthread_UNLOCK_MUTEX(OneTimeLock);
 486 }
 487
 488
 489
 490 /*
 491  * Allocate and initialize a shared context state structure.
 492  */
 493 static struct gl_shared_state *alloc_shared_state( void )
 494 {
 495    GLuint d;
 496    struct gl_shared_state *ss;
 497    GLboolean outOfMemory;
 498
 499    ss = CALLOC_STRUCT(gl_shared_state);
 500    if (!ss)
 501       return NULL;
 502
 503    ss->DisplayList = _mesa_NewHashTable();
 504
 505    ss->TexObjects = _mesa_NewHashTable();
 506
 507    /* Default Texture objects */
 508    outOfMemory = GL_FALSE;
 509    for (d = 1 ; d <= 3 ; d++) {
 510       ss->DefaultD[d] = gl_alloc_texture_object(ss, 0, d);
 511       if (!ss->DefaultD[d]) {
 512          outOfMemory = GL_TRUE;
 513          break;
 514       }
 515       ss->DefaultD[d]->RefCount++; /* don't free if not in use */
 516    }
 517
 518    if (!ss->DisplayList || !ss->TexObjects || outOfMemory) {
 519       /* Ran out of memory at some point.  Free everything and return NULL */
 520       if (ss->DisplayList)
 521          _mesa_DeleteHashTable(ss->DisplayList);
 522       if (ss->TexObjects)
 523          _mesa_DeleteHashTable(ss->TexObjects);
 524       if (ss->DefaultD[1])
 525          gl_free_texture_object(ss, ss->DefaultD[1]);
 526       if (ss->DefaultD[2])
 527          gl_free_texture_object(ss, ss->DefaultD[2]);
 528       if (ss->DefaultD[3])
 529          gl_free_texture_object(ss, ss->DefaultD[3]);
 530       FREE(ss);
 531       return NULL;
 532    }
 533    else {
 534       return ss;
 535    }
 536 }
 537
 538
 539 /*
 540  * Deallocate a shared state context and all children structures.
 541  */
 542 static void free_shared_state( GLcontext *ctx, struct gl_shared_state *ss )
 543 {
 544    /* Free display lists */
 545    while (1) {
 546       GLuint list = _mesa_HashFirstEntry(ss->DisplayList);
 547       if (list) {
 548          gl_destroy_list(ctx, list);
 549       }
 550       else {
 551          break;
 552       }
 553    }
 554    _mesa_DeleteHashTable(ss->DisplayList);
 555
 556    /* Free texture objects */
 557    while (ss->TexObjectList)
 558    {
 559       if (ctx->Driver.DeleteTexture)
 560          (*ctx->Driver.DeleteTexture)( ctx, ss->TexObjectList );
 561       /* this function removes from linked list too! */
 562       gl_free_texture_object(ss, ss->TexObjectList);
 563    }
 564    _mesa_DeleteHashTable(ss->TexObjects);
 565
 566    FREE(ss);
 567 }
 568
 569
 570
 571 /*
 572  * Initialize the nth light.  Note that the defaults for light 0 are
 573  * different than the other lights.
 574  */
 575 static void init_light( struct gl_light *l, GLuint n )
 576 {
 577    make_empty_list( l );
 578
 579    ASSIGN_4V( l->Ambient, 0.0, 0.0, 0.0, 1.0 );
 580    if (n==0) {
 581       ASSIGN_4V( l->Diffuse, 1.0, 1.0, 1.0, 1.0 );
 582       ASSIGN_4V( l->Specular, 1.0, 1.0, 1.0, 1.0 );
 583    }
 584    else {
 585       ASSIGN_4V( l->Diffuse, 0.0, 0.0, 0.0, 1.0 );
 586       ASSIGN_4V( l->Specular, 0.0, 0.0, 0.0, 1.0 );
 587    }
 588    ASSIGN_4V( l->EyePosition, 0.0, 0.0, 1.0, 0.0 );
 589    ASSIGN_3V( l->EyeDirection, 0.0, 0.0, -1.0 );
 590    l->SpotExponent = 0.0;
 591    gl_compute_spot_exp_table( l );
 592    l->SpotCutoff = 180.0;
 593    l->CosCutoff = 0.0;          /* KW: -ve values not admitted */
 594    l->ConstantAttenuation = 1.0;
 595    l->LinearAttenuation = 0.0;
 596    l->QuadraticAttenuation = 0.0;
 597    l->Enabled = GL_FALSE;
 598 }
 599
 600
 601
 602 static void init_lightmodel( struct gl_lightmodel *lm )
 603 {
 604    ASSIGN_4V( lm->Ambient, 0.2, 0.2, 0.2, 1.0 );
 605    lm->LocalViewer = GL_FALSE;
 606    lm->TwoSide = GL_FALSE;
 607    lm->ColorControl = GL_SINGLE_COLOR;
 608 }
 609
 610
 611 static void init_material( struct gl_material *m )
 612 {
 613    ASSIGN_4V( m->Ambient,  0.2, 0.2, 0.2, 1.0 );
 614    ASSIGN_4V( m->Diffuse,  0.8, 0.8, 0.8, 1.0 );
 615    ASSIGN_4V( m->Specular, 0.0, 0.0, 0.0, 1.0 );
 616    ASSIGN_4V( m->Emission, 0.0, 0.0, 0.0, 1.0 );
 617    m->Shininess = 0.0;
 618    m->AmbientIndex = 0;
 619    m->DiffuseIndex = 1;
 620    m->SpecularIndex = 1;
 621 }
 622
 623
 624
 625 static void init_texture_unit( GLcontext *ctx, GLuint unit )
 626 {
 627    struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
 628
 629    texUnit->EnvMode = GL_MODULATE;
 630    ASSIGN_4V( texUnit->EnvColor, 0.0, 0.0, 0.0, 0.0 );
 631    texUnit->TexGenEnabled = 0;
 632    texUnit->GenModeS = GL_EYE_LINEAR;
 633    texUnit->GenModeT = GL_EYE_LINEAR;
 634    texUnit->GenModeR = GL_EYE_LINEAR;
 635    texUnit->GenModeQ = GL_EYE_LINEAR;
 636    /* Yes, these plane coefficients are correct! */
 637    ASSIGN_4V( texUnit->ObjectPlaneS, 1.0, 0.0, 0.0, 0.0 );
 638    ASSIGN_4V( texUnit->ObjectPlaneT, 0.0, 1.0, 0.0, 0.0 );
 639    ASSIGN_4V( texUnit->ObjectPlaneR, 0.0, 0.0, 0.0, 0.0 );
 640    ASSIGN_4V( texUnit->ObjectPlaneQ, 0.0, 0.0, 0.0, 0.0 );
 641    ASSIGN_4V( texUnit->EyePlaneS, 1.0, 0.0, 0.0, 0.0 );
 642    ASSIGN_4V( texUnit->EyePlaneT, 0.0, 1.0, 0.0, 0.0 );
 643    ASSIGN_4V( texUnit->EyePlaneR, 0.0, 0.0, 0.0, 0.0 );
 644    ASSIGN_4V( texUnit->EyePlaneQ, 0.0, 0.0, 0.0, 0.0 );
 645
 646    texUnit->CurrentD[1] = ctx->Shared->DefaultD[1];
 647    texUnit->CurrentD[2] = ctx->Shared->DefaultD[2];
 648    texUnit->CurrentD[3] = ctx->Shared->DefaultD[3];
 649 }
 650
 651
 652 static void init_fallback_arrays( GLcontext *ctx )
 653 {
 654    struct gl_client_array *cl;
 655    GLuint i;
 656
 657    cl = &ctx->Fallback.Normal;
 658    cl->Size = 3;
 659    cl->Type = GL_FLOAT;
 660    cl->Stride = 0;
 661    cl->StrideB = 0;
 662    cl->Ptr = (void *) ctx->Current.Normal;
 663    cl->Enabled = 1;
 664
 665    cl = &ctx->Fallback.Color;
 666    cl->Size = 4;
 667    cl->Type = GL_UNSIGNED_BYTE;
 668    cl->Stride = 0;
 669    cl->StrideB = 0;
 670    cl->Ptr = (void *) ctx->Current.ByteColor;
 671    cl->Enabled = 1;
 672
 673    cl = &ctx->Fallback.Index;
 674    cl->Size = 1;
 675    cl->Type = GL_UNSIGNED_INT;
 676    cl->Stride = 0;
 677    cl->StrideB = 0;
 678    cl->Ptr = (void *) &ctx->Current.Index;
 679    cl->Enabled = 1;
 680
 681    for (i = 0 ; i < MAX_TEXTURE_UNITS ; i++) {
 682       cl = &ctx->Fallback.TexCoord[i];
 683       cl->Size = 4;
 684       cl->Type = GL_FLOAT;
 685       cl->Stride = 0;
 686       cl->StrideB = 0;
 687       cl->Ptr = (void *) ctx->Current.Texcoord[i];
 688       cl->Enabled = 1;
 689    }
 690
 691    cl = &ctx->Fallback.EdgeFlag;
 692    cl->Size = 1;
 693    cl->Type = GL_UNSIGNED_BYTE;
 694    cl->Stride = 0;
 695    cl->StrideB = 0;
 696    cl->Ptr = (void *) &ctx->Current.EdgeFlag;
 697    cl->Enabled = 1;
 698 }
 699
 700
 701 /* Initialize a 1-D evaluator map */
 702 static void init_1d_map( struct gl_1d_map *map, int n, const float *initial )
 703 {
 704    map->Order = 1;
 705    map->u1 = 0.0;
 706    map->u2 = 1.0;
 707    map->Points = (GLfloat *) MALLOC(n * sizeof(GLfloat));
 708    if (map->Points) {
 709       GLint i;
 710       for (i=0;i<n;i++)
 711          map->Points[i] = initial[i];
 712    }
 713 }
 714
 715
 716 /* Initialize a 2-D evaluator map */
 717 static void init_2d_map( struct gl_2d_map *map, int n, const float *initial )
 718 {
 719    map->Uorder = 1;
 720    map->Vorder = 1;
 721    map->u1 = 0.0;
 722    map->u2 = 1.0;
 723    map->v1 = 0.0;
 724    map->v2 = 1.0;
 725    map->Points = (GLfloat *) MALLOC(n * sizeof(GLfloat));
 726    if (map->Points) {
 727       GLint i;
 728       for (i=0;i<n;i++)
 729          map->Points[i] = initial[i];
 730    }
 731 }
 732
 733
 734 static void init_color_table( struct gl_color_table *p )
 735 {
 736    p->Table[0] = 255;
 737    p->Table[1] = 255;
 738    p->Table[2] = 255;
 739    p->Table[3] = 255;
 740    p->Size = 1;
 741    p->IntFormat = GL_RGBA;
 742    p->Format = GL_RGBA;
 743 }
 744
 745
 746 /*
 747  * Initialize the attribute groups in a GLcontext.
 748  */
 749 static void init_attrib_groups( GLcontext *ctx )
 750 {
 751    GLuint i, j;
 752
 753    assert(ctx);
 754
 755    /* Constants, may be overriden by device drivers */
 756    ctx->Const.MaxTextureLevels = MAX_TEXTURE_LEVELS;
 757    ctx->Const.MaxTextureSize = 1 << (MAX_TEXTURE_LEVELS - 1);
 758    ctx->Const.MaxTextureUnits = MAX_TEXTURE_UNITS;
 759    ctx->Const.MaxArrayLockSize = MAX_ARRAY_LOCK_SIZE;
 760    ctx->Const.SubPixelBits = SUB_PIXEL_BITS;
 761    ctx->Const.MinPointSize = MIN_POINT_SIZE;
 762    ctx->Const.MaxPointSize = MAX_POINT_SIZE;
 763    ctx->Const.MinPointSizeAA = MIN_POINT_SIZE;
 764    ctx->Const.MaxPointSizeAA = MAX_POINT_SIZE;
 765    ctx->Const.PointSizeGranularity = POINT_SIZE_GRANULARITY;
 766    ctx->Const.MinLineWidth = MIN_LINE_WIDTH;
 767    ctx->Const.MaxLineWidth = MAX_LINE_WIDTH;
 768    ctx->Const.MinLineWidthAA = MIN_LINE_WIDTH;
 769    ctx->Const.MaxLineWidthAA = MAX_LINE_WIDTH;
 770    ctx->Const.LineWidthGranularity = LINE_WIDTH_GRANULARITY;
 771    ctx->Const.NumAuxBuffers = NUM_AUX_BUFFERS;
 772
 773    /* Modelview matrix */
 774    gl_matrix_ctr( &ctx->ModelView );
 775    gl_matrix_alloc_inv( &ctx->ModelView );
 776
 777    ctx->ModelViewStackDepth = 0;
 778    for (i = 0 ; i < MAX_MODELVIEW_STACK_DEPTH ; i++) {
 779       gl_matrix_ctr( &ctx->ModelViewStack[i] );
 780       gl_matrix_alloc_inv( &ctx->ModelViewStack[i] );
 781    }
 782
 783    /* Projection matrix - need inv for user clipping in clip space*/
 784    gl_matrix_ctr( &ctx->ProjectionMatrix );
 785    gl_matrix_alloc_inv( &ctx->ProjectionMatrix );
 786
 787    gl_matrix_ctr( &ctx->ModelProjectMatrix );
 788    gl_matrix_ctr( &ctx->ModelProjectWinMatrix );
 789    ctx->ModelProjectWinMatrixUptodate = GL_FALSE;
 790
 791    ctx->ProjectionStackDepth = 0;
 792    ctx->NearFarStack[0][0] = 1.0; /* These values seem weird by make */
 793    ctx->NearFarStack[0][1] = 0.0; /* sense mathematically. */
 794
 795    for (i = 0 ; i < MAX_PROJECTION_STACK_DEPTH ; i++) {
 796       gl_matrix_ctr( &ctx->ProjectionStack[i] );
 797       gl_matrix_alloc_inv( &ctx->ProjectionStack[i] );
 798    }
 799
 800    /* Texture matrix */
 801    for (i=0; i<MAX_TEXTURE_UNITS; i++) {
 802       gl_matrix_ctr( &ctx->TextureMatrix[i] );
 803       ctx->TextureStackDepth[i] = 0;
 804       for (j = 0 ; j < MAX_TEXTURE_STACK_DEPTH ; j++) {
 805          ctx->TextureStack[i][j].inv = 0;
 806       }
 807    }
 808
 809    /* Accumulate buffer group */
 810    ASSIGN_4V( ctx->Accum.ClearColor, 0.0, 0.0, 0.0, 0.0 );
 811
 812    /* Color buffer group */
 813    ctx->Color.IndexMask = 0xffffffff;
 814    ctx->Color.ColorMask[0] = 0xff;
 815    ctx->Color.ColorMask[1] = 0xff;
 816    ctx->Color.ColorMask[2] = 0xff;
 817    ctx->Color.ColorMask[3] = 0xff;
 818    ctx->Color.SWmasking = GL_FALSE;
 819    ctx->Color.ClearIndex = 0;
 820    ASSIGN_4V( ctx->Color.ClearColor, 0.0, 0.0, 0.0, 0.0 );
 821    ctx->Color.DrawBuffer = GL_FRONT;
 822    ctx->Color.AlphaEnabled = GL_FALSE;
 823    ctx->Color.AlphaFunc = GL_ALWAYS;
 824    ctx->Color.AlphaRef = 0;
 825    ctx->Color.BlendEnabled = GL_FALSE;
 826    ctx->Color.BlendSrcRGB = GL_ONE;
 827    ctx->Color.BlendDstRGB = GL_ZERO;
 828    ctx->Color.BlendSrcA = GL_ONE;
 829    ctx->Color.BlendDstA = GL_ZERO;
 830    ctx->Color.BlendEquation = GL_FUNC_ADD_EXT;
 831    ctx->Color.BlendFunc = NULL;  /* this pointer set only when needed */
 832    ASSIGN_4V( ctx->Color.BlendColor, 0.0, 0.0, 0.0, 0.0 );
 833    ctx->Color.IndexLogicOpEnabled = GL_FALSE;
 834    ctx->Color.ColorLogicOpEnabled = GL_FALSE;
 835    ctx->Color.SWLogicOpEnabled = GL_FALSE;
 836    ctx->Color.LogicOp = GL_COPY;
 837    ctx->Color.DitherFlag = GL_TRUE;
 838    ctx->Color.MultiDrawBuffer = GL_FALSE;
 839
 840    /* Current group */
 841    ASSIGN_4V( ctx->Current.ByteColor, 255, 255, 255, 255);
 842    ctx->Current.Index = 1;
 843    for (i=0; i<MAX_TEXTURE_UNITS; i++)
 844       ASSIGN_4V( ctx->Current.Texcoord[i], 0.0, 0.0, 0.0, 1.0 );
 845    ASSIGN_4V( ctx->Current.RasterPos, 0.0, 0.0, 0.0, 1.0 );
 846    ctx->Current.RasterDistance = 0.0;
 847    ASSIGN_4V( ctx->Current.RasterColor, 1.0, 1.0, 1.0, 1.0 );
 848    ctx->Current.RasterIndex = 1;
 849    for (i=0; i<MAX_TEXTURE_UNITS; i++)
 850       ASSIGN_4V( ctx->Current.RasterMultiTexCoord[i], 0.0, 0.0, 0.0, 1.0 );
 851    ctx->Current.RasterTexCoord = ctx->Current.RasterMultiTexCoord[0];
 852    ctx->Current.RasterPosValid = GL_TRUE;
 853    ctx->Current.EdgeFlag = GL_TRUE;
 854    ASSIGN_3V( ctx->Current.Normal, 0.0, 0.0, 1.0 );
 855    ctx->Current.Primitive = (GLenum) (GL_POLYGON + 1);
 856
 857    ctx->Current.Flag = (VERT_NORM|VERT_INDEX|VERT_RGBA|VERT_EDGE|
 858                         VERT_TEX0_1|VERT_TEX1_1|VERT_MATERIAL);
 859
 860    init_fallback_arrays( ctx );
 861
 862    /* Depth buffer group */
 863    ctx->Depth.Test = GL_FALSE;
 864    ctx->Depth.Clear = 1.0;
 865    ctx->Depth.Func = GL_LESS;
 866    ctx->Depth.Mask = GL_TRUE;
 867
 868    /* Evaluators group */
 869    ctx->Eval.Map1Color4 = GL_FALSE;
 870    ctx->Eval.Map1Index = GL_FALSE;
 871    ctx->Eval.Map1Normal = GL_FALSE;
 872    ctx->Eval.Map1TextureCoord1 = GL_FALSE;
 873    ctx->Eval.Map1TextureCoord2 = GL_FALSE;
 874    ctx->Eval.Map1TextureCoord3 = GL_FALSE;
 875    ctx->Eval.Map1TextureCoord4 = GL_FALSE;
 876    ctx->Eval.Map1Vertex3 = GL_FALSE;
 877    ctx->Eval.Map1Vertex4 = GL_FALSE;
 878    ctx->Eval.Map2Color4 = GL_FALSE;
 879    ctx->Eval.Map2Index = GL_FALSE;
 880    ctx->Eval.Map2Normal = GL_FALSE;
 881    ctx->Eval.Map2TextureCoord1 = GL_FALSE;
 882    ctx->Eval.Map2TextureCoord2 = GL_FALSE;
 883    ctx->Eval.Map2TextureCoord3 = GL_FALSE;
 884    ctx->Eval.Map2TextureCoord4 = GL_FALSE;
 885    ctx->Eval.Map2Vertex3 = GL_FALSE;
 886    ctx->Eval.Map2Vertex4 = GL_FALSE;
 887    ctx->Eval.AutoNormal = GL_FALSE;
 888    ctx->Eval.MapGrid1un = 1;
 889    ctx->Eval.MapGrid1u1 = 0.0;
 890    ctx->Eval.MapGrid1u2 = 1.0;
 891    ctx->Eval.MapGrid2un = 1;
 892    ctx->Eval.MapGrid2vn = 1;
 893    ctx->Eval.MapGrid2u1 = 0.0;
 894    ctx->Eval.MapGrid2u2 = 1.0;
 895    ctx->Eval.MapGrid2v1 = 0.0;
 896    ctx->Eval.MapGrid2v2 = 1.0;
 897
 898    /* Evaluator data */
 899    {
 900       static GLfloat vertex[4] = { 0.0, 0.0, 0.0, 1.0 };
 901       static GLfloat normal[3] = { 0.0, 0.0, 1.0 };
 902       static GLfloat index[1] = { 1.0 };
 903       static GLfloat color[4] = { 1.0, 1.0, 1.0, 1.0 };
 904       static GLfloat texcoord[4] = { 0.0, 0.0, 0.0, 1.0 };
 905
 906       init_1d_map( &ctx->EvalMap.Map1Vertex3, 3, vertex );
 907       init_1d_map( &ctx->EvalMap.Map1Vertex4, 4, vertex );
 908       init_1d_map( &ctx->EvalMap.Map1Index, 1, index );
 909       init_1d_map( &ctx->EvalMap.Map1Color4, 4, color );
 910       init_1d_map( &ctx->EvalMap.Map1Normal, 3, normal );
 911       init_1d_map( &ctx->EvalMap.Map1Texture1, 1, texcoord );
 912       init_1d_map( &ctx->EvalMap.Map1Texture2, 2, texcoord );
 913       init_1d_map( &ctx->EvalMap.Map1Texture3, 3, texcoord );
 914       init_1d_map( &ctx->EvalMap.Map1Texture4, 4, texcoord );
 915
 916       init_2d_map( &ctx->EvalMap.Map2Vertex3, 3, vertex );
 917       init_2d_map( &ctx->EvalMap.Map2Vertex4, 4, vertex );
 918       init_2d_map( &ctx->EvalMap.Map2Index, 1, index );
 919       init_2d_map( &ctx->EvalMap.Map2Color4, 4, color );
 920       init_2d_map( &ctx->EvalMap.Map2Normal, 3, normal );
 921       init_2d_map( &ctx->EvalMap.Map2Texture1, 1, texcoord );
 922       init_2d_map( &ctx->EvalMap.Map2Texture2, 2, texcoord );
 923       init_2d_map( &ctx->EvalMap.Map2Texture3, 3, texcoord );
 924       init_2d_map( &ctx->EvalMap.Map2Texture4, 4, texcoord );
 925    }
 926
 927    /* Fog group */
 928    ctx->Fog.Enabled = GL_FALSE;
 929    ctx->Fog.Mode = GL_EXP;
 930    ASSIGN_4V( ctx->Fog.Color, 0.0, 0.0, 0.0, 0.0 );
 931    ctx->Fog.Index = 0.0;
 932    ctx->Fog.Density = 1.0;
 933    ctx->Fog.Start = 0.0;
 934    ctx->Fog.End = 1.0;
 935
 936    /* Hint group */
 937    ctx->Hint.PerspectiveCorrection = GL_DONT_CARE;
 938    ctx->Hint.PointSmooth = GL_DONT_CARE;
 939    ctx->Hint.LineSmooth = GL_DONT_CARE;
 940    ctx->Hint.PolygonSmooth = GL_DONT_CARE;
 941    ctx->Hint.Fog = GL_DONT_CARE;
 942
 943    ctx->Hint.AllowDrawWin = GL_TRUE;
 944    ctx->Hint.AllowDrawSpn = GL_TRUE;
 945    ctx->Hint.AllowDrawMem = GL_TRUE;
 946    ctx->Hint.StrictLighting = GL_TRUE;
 947
 948    /* Pipeline */
 949    gl_pipeline_init( ctx );
 950    gl_cva_init( ctx );
 951
 952    /* Extensions */
 953    gl_extensions_ctr( ctx );
 954
 955    ctx->AllowVertexCull = CLIP_CULLED_BIT;
 956
 957    /* Lighting group */
 958    for (i=0;i<MAX_LIGHTS;i++) {
 959       init_light( &ctx->Light.Light[i], i );
 960    }
 961    make_empty_list( &ctx->Light.EnabledList );
 962
 963    init_lightmodel( &ctx->Light.Model );
 964    init_material( &ctx->Light.Material[0] );
 965    init_material( &ctx->Light.Material[1] );
 966    ctx->Light.ShadeModel = GL_SMOOTH;
 967    ctx->Light.Enabled = GL_FALSE;
 968    ctx->Light.ColorMaterialFace = GL_FRONT_AND_BACK;
 969    ctx->Light.ColorMaterialMode = GL_AMBIENT_AND_DIFFUSE;
 970    ctx->Light.ColorMaterialBitmask
 971       = gl_material_bitmask( ctx,
 972                              GL_FRONT_AND_BACK,
 973                              GL_AMBIENT_AND_DIFFUSE, ~0, 0 );
 974
 975    ctx->Light.ColorMaterialEnabled = GL_FALSE;
 976
 977    /* Lighting miscellaneous */
 978    ctx->ShineTabList = MALLOC_STRUCT( gl_shine_tab );
 979    make_empty_list( ctx->ShineTabList );
 980    for (i = 0 ; i < 10 ; i++) {
 981       struct gl_shine_tab *s = MALLOC_STRUCT( gl_shine_tab );
 982       s->shininess = -1;
 983       s->refcount = 0;
 984       insert_at_tail( ctx->ShineTabList, s );
 985    }
 986    for (i = 0 ; i < 4 ; i++) {
 987       ctx->ShineTable[i] = ctx->ShineTabList->prev;
 988       ctx->ShineTable[i]->refcount++;
 989    }
 990
 991
 992    /* Line group */
 993    ctx->Line.SmoothFlag = GL_FALSE;
 994    ctx->Line.StippleFlag = GL_FALSE;
 995    ctx->Line.Width = 1.0;
 996    ctx->Line.StipplePattern = 0xffff;
 997    ctx->Line.StippleFactor = 1;
 998
 999    /* Display List group */
1000    ctx->List.ListBase = 0;
1001
1002    /* Pixel group */
1003    ctx->Pixel.RedBias = 0.0;
1004    ctx->Pixel.RedScale = 1.0;
1005    ctx->Pixel.GreenBias = 0.0;
1006    ctx->Pixel.GreenScale = 1.0;
1007    ctx->Pixel.BlueBias = 0.0;
1008    ctx->Pixel.BlueScale = 1.0;
1009    ctx->Pixel.AlphaBias = 0.0;
1010    ctx->Pixel.AlphaScale = 1.0;
1011    ctx->Pixel.ScaleOrBiasRGBA = GL_FALSE;
1012    ctx->Pixel.DepthBias = 0.0;
1013    ctx->Pixel.DepthScale = 1.0;
1014    ctx->Pixel.IndexOffset = 0;
1015    ctx->Pixel.IndexShift = 0;
1016    ctx->Pixel.ZoomX = 1.0;
1017    ctx->Pixel.ZoomY = 1.0;
1018    ctx->Pixel.MapColorFlag = GL_FALSE;
1019    ctx->Pixel.MapStencilFlag = GL_FALSE;
1020    ctx->Pixel.MapStoSsize = 1;
1021    ctx->Pixel.MapItoIsize = 1;
1022    ctx->Pixel.MapItoRsize = 1;
1023    ctx->Pixel.MapItoGsize = 1;
1024    ctx->Pixel.MapItoBsize = 1;
1025    ctx->Pixel.MapItoAsize = 1;
1026    ctx->Pixel.MapRtoRsize = 1;
1027    ctx->Pixel.MapGtoGsize = 1;
1028    ctx->Pixel.MapBtoBsize = 1;
1029    ctx->Pixel.MapAtoAsize = 1;
1030    ctx->Pixel.MapStoS[0] = 0;
1031    ctx->Pixel.MapItoI[0] = 0;
1032    ctx->Pixel.MapItoR[0] = 0.0;
1033    ctx->Pixel.MapItoG[0] = 0.0;
1034    ctx->Pixel.MapItoB[0] = 0.0;
1035    ctx->Pixel.MapItoA[0] = 0.0;
1036    ctx->Pixel.MapItoR8[0] = 0;
1037    ctx->Pixel.MapItoG8[0] = 0;
1038    ctx->Pixel.MapItoB8[0] = 0;
1039    ctx->Pixel.MapItoA8[0] = 0;
1040    ctx->Pixel.MapRtoR[0] = 0.0;
1041    ctx->Pixel.MapGtoG[0] = 0.0;
1042    ctx->Pixel.MapBtoB[0] = 0.0;
1043    ctx->Pixel.MapAtoA[0] = 0.0;
1044
1045    /* Point group */
1046    ctx->Point.SmoothFlag = GL_FALSE;
1047    ctx->Point.Size = 1.0;
1048    ctx->Point.Params[0] = 1.0;
1049    ctx->Point.Params[1] = 0.0;
1050    ctx->Point.Params[2] = 0.0;
1051    ctx->Point.Attenuated = GL_FALSE;
1052    ctx->Point.MinSize = 0.0;
1053    ctx->Point.MaxSize = (GLfloat) MAX_POINT_SIZE;
1054    ctx->Point.Threshold = 1.0;
1055
1056    /* Polygon group */
1057    ctx->Polygon.CullFlag = GL_FALSE;
1058    ctx->Polygon.CullFaceMode = GL_BACK;
1059    ctx->Polygon.FrontFace = GL_CCW;
1060    ctx->Polygon.FrontBit = 0;
1061    ctx->Polygon.FrontMode = GL_FILL;
1062    ctx->Polygon.BackMode = GL_FILL;
1063    ctx->Polygon.Unfilled = GL_FALSE;
1064    ctx->Polygon.SmoothFlag = GL_FALSE;
1065    ctx->Polygon.StippleFlag = GL_FALSE;
1066    ctx->Polygon.OffsetFactor = 0.0F;
1067    ctx->Polygon.OffsetUnits = 0.0F;
1068    ctx->Polygon.OffsetPoint = GL_FALSE;
1069    ctx->Polygon.OffsetLine = GL_FALSE;
1070    ctx->Polygon.OffsetFill = GL_FALSE;
1071
1072    /* Polygon Stipple group */
1073    MEMSET( ctx->PolygonStipple, 0xff, 32*sizeof(GLuint) );
1074
1075    /* Scissor group */
1076    ctx->Scissor.Enabled = GL_FALSE;
1077    ctx->Scissor.X = 0;
1078    ctx->Scissor.Y = 0;
1079    ctx->Scissor.Width = 0;
1080    ctx->Scissor.Height = 0;
1081
1082    /* Stencil group */
1083    ctx->Stencil.Enabled = GL_FALSE;
1084    ctx->Stencil.Function = GL_ALWAYS;
1085    ctx->Stencil.FailFunc = GL_KEEP;
1086    ctx->Stencil.ZPassFunc = GL_KEEP;
1087    ctx->Stencil.ZFailFunc = GL_KEEP;
1088    ctx->Stencil.Ref = 0;
1089    ctx->Stencil.ValueMask = STENCIL_MAX;
1090    ctx->Stencil.Clear = 0;
1091    ctx->Stencil.WriteMask = STENCIL_MAX;
1092
1093    /* Texture group */
1094    ctx->Texture.CurrentUnit = 0;      /* multitexture */
1095    ctx->Texture.CurrentTransformUnit = 0; /* multitexture */
1096    ctx->Texture.Enabled = 0;
1097    for (i=0; i<MAX_TEXTURE_UNITS; i++)
1098       init_texture_unit( ctx, i );
1099    init_color_table(&ctx->Texture.Palette);
1100
1101    /* Transformation group */
1102    ctx->Transform.MatrixMode = GL_MODELVIEW;
1103    ctx->Transform.Normalize = GL_FALSE;
1104    ctx->Transform.RescaleNormals = GL_FALSE;
1105    for (i=0;i<MAX_CLIP_PLANES;i++) {
1106       ctx->Transform.ClipEnabled[i] = GL_FALSE;
1107       ASSIGN_4V( ctx->Transform.EyeUserPlane[i], 0.0, 0.0, 0.0, 0.0 );
1108    }
1109    ctx->Transform.AnyClip = GL_FALSE;
1110
1111    /* Viewport group */
1112    ctx->Viewport.X = 0;
1113    ctx->Viewport.Y = 0;
1114    ctx->Viewport.Width = 0;
1115    ctx->Viewport.Height = 0;
1116    ctx->Viewport.Near = 0.0;
1117    ctx->Viewport.Far = 1.0;
1118    gl_matrix_ctr(&ctx->Viewport.WindowMap);
1119
1120 #define Sz 10
1121 #define Tz 14
1122    ctx->Viewport.WindowMap.m[Sz] = 0.5 * ctx->Visual->DepthMaxF;
1123    ctx->Viewport.WindowMap.m[Tz] = 0.5 * ctx->Visual->DepthMaxF;
1124 #undef Sz
1125 #undef Tz
1126
1127    ctx->Viewport.WindowMap.flags = MAT_FLAG_GENERAL_SCALE|MAT_FLAG_TRANSLATION;
1128    ctx->Viewport.WindowMap.type = MATRIX_3D_NO_ROT;
1129
1130    /* Vertex arrays */
1131    ctx->Array.Vertex.Size = 4;
1132    ctx->Array.Vertex.Type = GL_FLOAT;
1133    ctx->Array.Vertex.Stride = 0;
1134    ctx->Array.Vertex.StrideB = 0;
1135    ctx->Array.Vertex.Ptr = NULL;
1136    ctx->Array.Vertex.Enabled = GL_FALSE;
1137    ctx->Array.Normal.Type = GL_FLOAT;
1138    ctx->Array.Normal.Stride = 0;
1139    ctx->Array.Normal.StrideB = 0;
1140    ctx->Array.Normal.Ptr = NULL;
1141    ctx->Array.Normal.Enabled = GL_FALSE;
1142    ctx->Array.Color.Size = 4;
1143    ctx->Array.Color.Type = GL_FLOAT;
1144    ctx->Array.Color.Stride = 0;
1145    ctx->Array.Color.StrideB = 0;
1146    ctx->Array.Color.Ptr = NULL;
1147    ctx->Array.Color.Enabled = GL_FALSE;
1148    ctx->Array.Index.Type = GL_FLOAT;
1149    ctx->Array.Index.Stride = 0;
1150    ctx->Array.Index.StrideB = 0;
1151    ctx->Array.Index.Ptr = NULL;
1152    ctx->Array.Index.Enabled = GL_FALSE;
1153    for (i = 0; i < MAX_TEXTURE_UNITS; i++) {
1154       ctx->Array.TexCoord[i].Size = 4;
1155       ctx->Array.TexCoord[i].Type = GL_FLOAT;
1156       ctx->Array.TexCoord[i].Stride = 0;
1157       ctx->Array.TexCoord[i].StrideB = 0;
1158       ctx->Array.TexCoord[i].Ptr = NULL;
1159       ctx->Array.TexCoord[i].Enabled = GL_FALSE;
1160    }
1161    ctx->Array.TexCoordInterleaveFactor = 1;
1162    ctx->Array.EdgeFlag.Stride = 0;
1163    ctx->Array.EdgeFlag.StrideB = 0;
1164    ctx->Array.EdgeFlag.Ptr = NULL;
1165    ctx->Array.EdgeFlag.Enabled = GL_FALSE;
1166    ctx->Array.ActiveTexture = 0;   /* GL_ARB_multitexture */
1167
1168    /* Pixel transfer */
1169    ctx->Pack.Alignment = 4;
1170    ctx->Pack.RowLength = 0;
1171    ctx->Pack.ImageHeight = 0;
1172    ctx->Pack.SkipPixels = 0;
1173    ctx->Pack.SkipRows = 0;
1174    ctx->Pack.SkipImages = 0;
1175    ctx->Pack.SwapBytes = GL_FALSE;
1176    ctx->Pack.LsbFirst = GL_FALSE;
1177    ctx->Unpack.Alignment = 4;
1178    ctx->Unpack.RowLength = 0;
1179    ctx->Unpack.ImageHeight = 0;
1180    ctx->Unpack.SkipPixels = 0;
1181    ctx->Unpack.SkipRows = 0;
1182    ctx->Unpack.SkipImages = 0;
1183    ctx->Unpack.SwapBytes = GL_FALSE;
1184    ctx->Unpack.LsbFirst = GL_FALSE;
1185
1186    /* Feedback */
1187    ctx->Feedback.Type = GL_2D;   /* TODO: verify */
1188    ctx->Feedback.Buffer = NULL;
1189    ctx->Feedback.BufferSize = 0;
1190    ctx->Feedback.Count = 0;
1191
1192    /* Selection/picking */
1193    ctx->Select.Buffer = NULL;
1194    ctx->Select.BufferSize = 0;
1195    ctx->Select.BufferCount = 0;
1196    ctx->Select.Hits = 0;
1197    ctx->Select.NameStackDepth = 0;
1198
1199    /* Optimized Accum buffer */
1200    ctx->IntegerAccumMode = GL_TRUE;
1201    ctx->IntegerAccumScaler = 0.0;
1202
1203    /* Renderer and client attribute stacks */
1204    ctx->AttribStackDepth = 0;
1205    ctx->ClientAttribStackDepth = 0;
1206
1207    /* Miscellaneous */
1208    ctx->NewState = NEW_ALL;
1209    ctx->RenderMode = GL_RENDER;
1210    ctx->StippleCounter = 0;
1211    ctx->NeedNormals = GL_FALSE;
1212    ctx->DoViewportMapping = GL_TRUE;
1213
1214    ctx->NeedEyeCoords = GL_FALSE;
1215    ctx->NeedEyeNormals = GL_FALSE;
1216    ctx->vb_proj_matrix = &ctx->ModelProjectMatrix;
1217
1218    /* Display list */
1219    ctx->CallDepth = 0;
1220    ctx->ExecuteFlag = GL_TRUE;
1221    ctx->CompileFlag = GL_FALSE;
1222    ctx->CurrentListPtr = NULL;
1223    ctx->CurrentBlock = NULL;
1224    ctx->CurrentListNum = 0;
1225    ctx->CurrentPos = 0;
1226
1227    ctx->ErrorValue = (GLenum) GL_NO_ERROR;
1228
1229    ctx->CatchSignals = GL_TRUE;
1230
1231    /* For debug/development only */
1232    ctx->NoRaster = getenv("MESA_NO_RASTER") ? GL_TRUE : GL_FALSE;
1233    ctx->FirstTimeCurrent = GL_TRUE;
1234
1235    /* Dither disable */
1236    ctx->NoDither = getenv("MESA_NO_DITHER") ? GL_TRUE : GL_FALSE;
1237    if (ctx->NoDither) {
1238       if (getenv("MESA_DEBUG")) {
1239          fprintf(stderr, "MESA_NO_DITHER set - dithering disabled\n");
1240       }
1241       ctx->Color.DitherFlag = GL_FALSE;
1242    }
1243 }
1244
1245
1246
1247
1248 /*
1249  * Allocate the proxy textures.  If we run out of memory part way through
1250  * the allocations clean up and return GL_FALSE.
1251  * Return:  GL_TRUE=success, GL_FALSE=failure
1252  */
1253 static GLboolean alloc_proxy_textures( GLcontext *ctx )
1254 {
1255    GLboolean out_of_memory;
1256    GLint i;
1257
1258    ctx->Texture.Proxy1D = gl_alloc_texture_object(NULL, 0, 1);
1259    if (!ctx->Texture.Proxy1D) {
1260       return GL_FALSE;
1261    }
1262
1263    ctx->Texture.Proxy2D = gl_alloc_texture_object(NULL, 0, 2);
1264    if (!ctx->Texture.Proxy2D) {
1265       gl_free_texture_object(NULL, ctx->Texture.Proxy1D);
1266       return GL_FALSE;
1267    }
1268
1269    ctx->Texture.Proxy3D = gl_alloc_texture_object(NULL, 0, 3);
1270    if (!ctx->Texture.Proxy3D) {
1271       gl_free_texture_object(NULL, ctx->Texture.Proxy1D);
1272       gl_free_texture_object(NULL, ctx->Texture.Proxy2D);
1273       return GL_FALSE;
1274    }
1275
1276    out_of_memory = GL_FALSE;
1277    for (i=0;i<MAX_TEXTURE_LEVELS;i++) {
1278       ctx->Texture.Proxy1D->Image[i] = gl_alloc_texture_image();
1279       ctx->Texture.Proxy2D->Image[i] = gl_alloc_texture_image();
1280       ctx->Texture.Proxy3D->Image[i] = gl_alloc_texture_image();
1281       if (!ctx->Texture.Proxy1D->Image[i]
1282           || !ctx->Texture.Proxy2D->Image[i]
1283           || !ctx->Texture.Proxy3D->Image[i]) {
1284          out_of_memory = GL_TRUE;
1285       }
1286    }
1287    if (out_of_memory) {
1288       for (i=0;i<MAX_TEXTURE_LEVELS;i++) {
1289          if (ctx->Texture.Proxy1D->Image[i]) {
1290             gl_free_texture_image(ctx->Texture.Proxy1D->Image[i]);
1291          }
1292          if (ctx->Texture.Proxy2D->Image[i]) {
1293             gl_free_texture_image(ctx->Texture.Proxy2D->Image[i]);
1294          }
1295          if (ctx->Texture.Proxy3D->Image[i]) {
1296             gl_free_texture_image(ctx->Texture.Proxy3D->Image[i]);
1297          }
1298       }
1299       gl_free_texture_object(NULL, ctx->Texture.Proxy1D);
1300       gl_free_texture_object(NULL, ctx->Texture.Proxy2D);
1301       gl_free_texture_object(NULL, ctx->Texture.Proxy3D);
1302       return GL_FALSE;
1303    }
1304    else {
1305       return GL_TRUE;
1306    }
1307 }
1308
1309
1310
1311 /*
1312  * Initialize a GLcontext struct.
1313  */
1314 GLboolean gl_initialize_context_data( GLcontext *ctx,
1315                                       GLvisual *visual,
1316                                       GLcontext *share_list,
1317                                       void *driver_ctx,
1318                                       GLboolean direct )
1319 {
1320    (void) direct;  /* not used */
1321
1322    /* misc one-time initializations */
1323    one_time_init();
1324
1325    ctx->DriverCtx = driver_ctx;
1326    ctx->Visual = visual;
1327    ctx->DrawBuffer = NULL;
1328    ctx->ReadBuffer = NULL;
1329
1330    ctx->VB = gl_vb_create_for_immediate( ctx );
1331    if (!ctx->VB) {
1332       FREE( ctx );
1333       return GL_FALSE;
1334    }
1335    ctx->input = ctx->VB->IM;
1336
1337    ctx->PB = gl_alloc_pb();
1338    if (!ctx->PB) {
1339       FREE( ctx->VB );
1340       FREE( ctx );
1341       return GL_FALSE;
1342    }
1343
1344    if (share_list) {
1345       /* share the group of display lists of another context */
1346       ctx->Shared = share_list->Shared;
1347    }
1348    else {
1349       /* allocate new group of display lists */
1350       ctx->Shared = alloc_shared_state();
1351       if (!ctx->Shared) {
1352          FREE(ctx->VB);
1353          FREE(ctx->PB);
1354          FREE(ctx);
1355          return GL_FALSE;
1356       }
1357    }
1358    _glthread_LOCK_MUTEX(ctx->Shared->Mutex);
1359    ctx->Shared->RefCount++;
1360    _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
1361
1362    init_attrib_groups( ctx );
1363
1364    gl_reset_vb( ctx->VB );
1365    gl_reset_input( ctx );
1366
1367    if (visual->DBflag) {
1368       ctx->Color.DrawBuffer = GL_BACK;
1369       ctx->Color.DriverDrawBuffer = GL_BACK_LEFT;
1370       ctx->Color.DrawDestMask = BACK_LEFT_BIT;
1371       ctx->Pixel.ReadBuffer = GL_BACK;
1372       ctx->Pixel.DriverReadBuffer = GL_BACK_LEFT;
1373    }
1374    else {
1375       ctx->Color.DrawBuffer = GL_FRONT;
1376       ctx->Color.DriverDrawBuffer = GL_FRONT_LEFT;
1377       ctx->Color.DrawDestMask = FRONT_LEFT_BIT;
1378       ctx->Pixel.ReadBuffer = GL_FRONT;
1379       ctx->Pixel.DriverReadBuffer = GL_FRONT_LEFT;
1380    }
1381
1382 #ifdef PROFILE
1383    init_timings( ctx );
1384 #endif
1385
1386    if (!alloc_proxy_textures(ctx)) {
1387       free_shared_state(ctx, ctx->Shared);
1388       FREE(ctx->VB);
1389       FREE(ctx->PB);
1390       FREE(ctx);
1391       return GL_FALSE;
1392    }
1393
1394    /* setup API dispatch tables */
1395    ctx->Exec = CALLOC(_glapi_get_dispatch_table_size() * sizeof(void *));
1396    ctx->Save = CALLOC(_glapi_get_dispatch_table_size() * sizeof(void *));
1397    if (!ctx->Exec || !ctx->Save) {
1398       free_shared_state(ctx, ctx->Shared);
1399       FREE(ctx->VB);
1400       FREE(ctx->PB);
1401       if (ctx->Exec)
1402          FREE(ctx->Exec);
1403       FREE(ctx);
1404    }
1405    _mesa_init_exec_table( ctx->Exec );
1406    _mesa_init_dlist_table( ctx->Save );
1407    ctx->CurrentDispatch = ctx->Exec;
1408
1409    return GL_TRUE;
1410 }
1411
1412
1413
1414 /*
1415  * Allocate and initialize a GLcontext structure.
1416  * Input:  visual - a GLvisual pointer
1417  *         sharelist - another context to share display lists with or NULL
1418  *         driver_ctx - pointer to device driver's context state struct
1419  * Return:  pointer to a new gl_context struct or NULL if error.
1420  */
1421 GLcontext *gl_create_context( GLvisual *visual,
1422                               GLcontext *share_list,
1423                               void *driver_ctx,
1424                               GLboolean direct )
1425 {
1426    GLcontext *ctx = (GLcontext *) CALLOC( sizeof(GLcontext) );
1427    if (!ctx) {
1428       return NULL;
1429    }
1430
1431    if (gl_initialize_context_data(ctx, visual, share_list,
1432                                   driver_ctx, direct)) {
1433       return ctx;
1434    }
1435    else {
1436       FREE(ctx);
1437       return NULL;
1438    }
1439 }
1440
1441
1442
1443 /*
1444  * Free the data associated with the given context.
1445  * But don't free() the GLcontext struct itself!
1446  */
1447 void gl_free_context_data( GLcontext *ctx )
1448 {
1449    GLuint i;
1450    struct gl_shine_tab *s, *tmps;
1451
1452    /* if we're destroying the current context, unbind it first */
1453    if (ctx == gl_get_current_context()) {
1454       gl_make_current(NULL, NULL);
1455    }
1456
1457 #ifdef PROFILE
1458    if (getenv("MESA_PROFILE")) {
1459       print_timings( ctx );
1460    }
1461 #endif
1462
1463    gl_matrix_dtr( &ctx->ModelView );
1464    for (i = 0 ; i < MAX_MODELVIEW_STACK_DEPTH ; i++) {
1465       gl_matrix_dtr( &ctx->ModelViewStack[i] );
1466    }
1467    gl_matrix_dtr( &ctx->ProjectionMatrix );
1468    for (i = 0 ; i < MAX_PROJECTION_STACK_DEPTH ; i++) {
1469       gl_matrix_dtr( &ctx->ProjectionStack[i] );
1470    }
1471
1472    FREE( ctx->PB );
1473
1474    if(ctx->input != ctx->VB->IM)
1475       gl_immediate_free( ctx->input );
1476
1477    gl_vb_free( ctx->VB );
1478
1479    _glthread_LOCK_MUTEX(ctx->Shared->Mutex);
1480    ctx->Shared->RefCount--;
1481    assert(ctx->Shared->RefCount >= 0);
1482    _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
1483    if (ctx->Shared->RefCount == 0) {
1484       /* free shared state */
1485       free_shared_state( ctx, ctx->Shared );
1486    }
1487
1488    foreach_s( s, tmps, ctx->ShineTabList ) {
1489       FREE( s );
1490    }
1491    FREE( ctx->ShineTabList );
1492
1493    /* Free proxy texture objects */
1494    gl_free_texture_object( NULL, ctx->Texture.Proxy1D );
1495    gl_free_texture_object( NULL, ctx->Texture.Proxy2D );
1496    gl_free_texture_object( NULL, ctx->Texture.Proxy3D );
1497
1498    /* Free evaluator data */
1499    if (ctx->EvalMap.Map1Vertex3.Points)
1500       FREE( ctx->EvalMap.Map1Vertex3.Points );
1501    if (ctx->EvalMap.Map1Vertex4.Points)
1502       FREE( ctx->EvalMap.Map1Vertex4.Points );
1503    if (ctx->EvalMap.Map1Index.Points)
1504       FREE( ctx->EvalMap.Map1Index.Points );
1505    if (ctx->EvalMap.Map1Color4.Points)
1506       FREE( ctx->EvalMap.Map1Color4.Points );
1507    if (ctx->EvalMap.Map1Normal.Points)
1508       FREE( ctx->EvalMap.Map1Normal.Points );
1509    if (ctx->EvalMap.Map1Texture1.Points)
1510       FREE( ctx->EvalMap.Map1Texture1.Points );
1511    if (ctx->EvalMap.Map1Texture2.Points)
1512       FREE( ctx->EvalMap.Map1Texture2.Points );
1513    if (ctx->EvalMap.Map1Texture3.Points)
1514       FREE( ctx->EvalMap.Map1Texture3.Points );
1515    if (ctx->EvalMap.Map1Texture4.Points)
1516       FREE( ctx->EvalMap.Map1Texture4.Points );
1517
1518    if (ctx->EvalMap.Map2Vertex3.Points)
1519       FREE( ctx->EvalMap.Map2Vertex3.Points );
1520    if (ctx->EvalMap.Map2Vertex4.Points)
1521       FREE( ctx->EvalMap.Map2Vertex4.Points );
1522    if (ctx->EvalMap.Map2Index.Points)
1523       FREE( ctx->EvalMap.Map2Index.Points );
1524    if (ctx->EvalMap.Map2Color4.Points)
1525       FREE( ctx->EvalMap.Map2Color4.Points );
1526    if (ctx->EvalMap.Map2Normal.Points)
1527       FREE( ctx->EvalMap.Map2Normal.Points );
1528    if (ctx->EvalMap.Map2Texture1.Points)
1529       FREE( ctx->EvalMap.Map2Texture1.Points );
1530    if (ctx->EvalMap.Map2Texture2.Points)
1531       FREE( ctx->EvalMap.Map2Texture2.Points );
1532    if (ctx->EvalMap.Map2Texture3.Points)
1533       FREE( ctx->EvalMap.Map2Texture3.Points );
1534    if (ctx->EvalMap.Map2Texture4.Points)
1535       FREE( ctx->EvalMap.Map2Texture4.Points );
1536
1537    /* Free cache of immediate buffers. */
1538    while (ctx->nr_im_queued-- > 0) {
1539       struct immediate * next = ctx->freed_im_queue->next;
1540       FREE( ctx->freed_im_queue );
1541       ctx->freed_im_queue = next;
1542    }
1543    gl_extensions_dtr(ctx);
1544
1545    FREE(ctx->Exec);
1546    FREE(ctx->Save);
1547 }
1548
1549
1550
1551 /*
1552  * Destroy a GLcontext structure.
1553  */
1554 void gl_destroy_context( GLcontext *ctx )
1555 {
1556    if (ctx) {
1557       gl_free_context_data(ctx);
1558       FREE( (void *) ctx );
1559    }
1560 }
1561
1562
1563
1564 /*
1565  * Called by the driver after both the context and driver are fully
1566  * initialized.  Currently just reads the config file.
1567  */
1568 void gl_context_initialize( GLcontext *ctx )
1569 {
1570    gl_read_config_file( ctx );
1571 }
1572
1573
1574
1575 /*
1576  * Copy attribute groups from one context to another.
1577  * Input:  src - source context
1578  *         dst - destination context
1579  *         mask - bitwise OR of GL_*_BIT flags
1580  */
1581 void gl_copy_context( const GLcontext *src, GLcontext *dst, GLuint mask )
1582 {
1583    if (mask & GL_ACCUM_BUFFER_BIT) {
1584       MEMCPY( &dst->Accum, &src->Accum, sizeof(struct gl_accum_attrib) );
1585    }
1586    if (mask & GL_COLOR_BUFFER_BIT) {
1587       MEMCPY( &dst->Color, &src->Color, sizeof(struct gl_colorbuffer_attrib) );
1588    }
1589    if (mask & GL_CURRENT_BIT) {
1590       MEMCPY( &dst->Current, &src->Current, sizeof(struct gl_current_attrib) );
1591    }
1592    if (mask & GL_DEPTH_BUFFER_BIT) {
1593       MEMCPY( &dst->Depth, &src->Depth, sizeof(struct gl_depthbuffer_attrib) );
1594    }
1595    if (mask & GL_ENABLE_BIT) {
1596       /* no op */
1597    }
1598    if (mask & GL_EVAL_BIT) {
1599       MEMCPY( &dst->Eval, &src->Eval, sizeof(struct gl_eval_attrib) );
1600    }
1601    if (mask & GL_FOG_BIT) {
1602       MEMCPY( &dst->Fog, &src->Fog, sizeof(struct gl_fog_attrib) );
1603    }
1604    if (mask & GL_HINT_BIT) {
1605       MEMCPY( &dst->Hint, &src->Hint, sizeof(struct gl_hint_attrib) );
1606    }
1607    if (mask & GL_LIGHTING_BIT) {
1608       MEMCPY( &dst->Light, &src->Light, sizeof(struct gl_light_attrib) );
1609       /*       gl_reinit_light_attrib( &dst->Light ); */
1610    }
1611    if (mask & GL_LINE_BIT) {
1612       MEMCPY( &dst->Line, &src->Line, sizeof(struct gl_line_attrib) );
1613    }
1614    if (mask & GL_LIST_BIT) {
1615       MEMCPY( &dst->List, &src->List, sizeof(struct gl_list_attrib) );
1616    }
1617    if (mask & GL_PIXEL_MODE_BIT) {
1618       MEMCPY( &dst->Pixel, &src->Pixel, sizeof(struct gl_pixel_attrib) );
1619    }
1620    if (mask & GL_POINT_BIT) {
1621       MEMCPY( &dst->Point, &src->Point, sizeof(struct gl_point_attrib) );
1622    }
1623    if (mask & GL_POLYGON_BIT) {
1624       MEMCPY( &dst->Polygon, &src->Polygon, sizeof(struct gl_polygon_attrib) );
1625    }
1626    if (mask & GL_POLYGON_STIPPLE_BIT) {
1627       /* Use loop instead of MEMCPY due to problem with Portland Group's
1628        * C compiler.  Reported by John Stone.
1629        */
1630       int i;
1631       for (i=0;i<32;i++) {
1632          dst->PolygonStipple[i] = src->PolygonStipple[i];
1633       }
1634    }
1635    if (mask & GL_SCISSOR_BIT) {
1636       MEMCPY( &dst->Scissor, &src->Scissor, sizeof(struct gl_scissor_attrib) );
1637    }
1638    if (mask & GL_STENCIL_BUFFER_BIT) {
1639       MEMCPY( &dst->Stencil, &src->Stencil, sizeof(struct gl_stencil_attrib) );
1640    }
1641    if (mask & GL_TEXTURE_BIT) {
1642       MEMCPY( &dst->Texture, &src->Texture, sizeof(struct gl_texture_attrib) );
1643    }
1644    if (mask & GL_TRANSFORM_BIT) {
1645       MEMCPY( &dst->Transform, &src->Transform, sizeof(struct gl_transform_attrib) );
1646    }
1647    if (mask & GL_VIEWPORT_BIT) {
1648       MEMCPY( &dst->Viewport, &src->Viewport, sizeof(struct gl_viewport_attrib) );
1649    }
1650 }
1651
1652
1653 /*
1654  * Set the current context, binding the given frame buffer to the context.
1655  */
1656 void gl_make_current( GLcontext *newCtx, GLframebuffer *buffer )
1657 {
1658    gl_make_current2( newCtx, buffer, buffer );
1659 }
1660
1661
1662 /*
1663  * Bind the given context to the given draw-buffer and read-buffer
1664  * and make it the current context for this thread.
1665  */
1666 void gl_make_current2( GLcontext *newCtx, GLframebuffer *drawBuffer,
1667                        GLframebuffer *readBuffer )
1668 {
1669 #if 0
1670    GLcontext *oldCtx = gl_get_context();
1671
1672    /* Flush the old context
1673     */
1674    if (oldCtx) {
1675       ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(oldCtx, "gl_make_current");
1676
1677       /* unbind frame buffers from context */
1678       if (oldCtx->DrawBuffer) {
1679          oldCtx->DrawBuffer = NULL;
1680       }
1681       if (oldCtx->ReadBuffer) {
1682          oldCtx->ReadBuffer = NULL;
1683       }
1684    }
1685 #endif
1686
1687    /* We call this function periodically (just here for now) in
1688     * order to detect when multithreading has begun.
1689     */
1690    _glapi_check_multithread();
1691
1692    _glapi_set_context((void *) newCtx);
1693    ASSERT(gl_get_current_context() == newCtx);
1694    if (newCtx) {
1695       SET_IMMEDIATE(newCtx, newCtx->input);
1696       _glapi_set_dispatch(newCtx->CurrentDispatch);
1697    }
1698    else {
1699       _glapi_set_dispatch(NULL);  /* none current */
1700    }
1701
1702    if (MESA_VERBOSE) fprintf(stderr, "gl_make_current()\n");
1703
1704    if (newCtx && drawBuffer && readBuffer) {
1705       /* TODO: check if newCtx and buffer's visual match??? */
1706       newCtx->DrawBuffer = drawBuffer;
1707       newCtx->ReadBuffer = readBuffer;
1708       newCtx->NewState = NEW_ALL;   /* just to be safe */
1709       gl_update_state( newCtx );
1710    }
1711
1712    /* We can use this to help debug user's problems.  Tell the to set
1713     * the MESA_INFO env variable before running their app.  Then the
1714     * first time each context is made current we'll print some useful
1715     * information.
1716     */
1717    if (newCtx && newCtx->FirstTimeCurrent) {
1718       if (getenv("MESA_INFO")) {
1719          fprintf(stderr, "Mesa GL_VERSION = %s\n", (char *) _mesa_GetString(GL_VERSION));
1720          fprintf(stderr, "Mesa GL_RENDERER = %s\n", (char *) _mesa_GetString(GL_RENDERER));
1721          fprintf(stderr, "Mesa GL_VENDOR = %s\n", (char *) _mesa_GetString(GL_VENDOR));
1722          fprintf(stderr, "Mesa GL_EXTENSIONS = %s\n", (char *) _mesa_GetString(GL_EXTENSIONS));
1723 #if defined(THREADS)
1724          fprintf(stderr, "Mesa thread-safe: YES\n");
1725 #else
1726          fprintf(stderr, "Mesa thread-safe: NO\n");
1727 #endif
1728 #if defined(USE_X86_ASM)
1729          fprintf(stderr, "Mesa x86-optimized: YES\n");
1730 #else
1731          fprintf(stderr, "Mesa x86-optimized: NO\n");
1732 #endif
1733       }
1734       newCtx->FirstTimeCurrent = GL_FALSE;
1735    }
1736 }
1737
1738
1739
1740 /*
1741  * Return current context handle for the calling thread.
1742  * This isn't the fastest way to get the current context.
1743  * If you need speed, see the GET_CURRENT_CONTEXT() macro in context.h
1744  */
1745 GLcontext *gl_get_current_context( void )
1746 {
1747    return (GLcontext *) _glapi_get_context();
1748 }
1749
1750
1751
1752 /*
1753  * This should be called by device drivers just before they do a
1754  * swapbuffers.  Any pending rendering commands will be executed.
1755  */
1756 void
1757 _mesa_swapbuffers(GLcontext *ctx)
1758 {
1759    FLUSH_VB( ctx, "swap buffers" );
1760 }
1761
1762
1763
1764 /*
1765  * Return pointer to this context's current API dispatch table.
1766  * It'll either be the immediate-mode execute dispatcher or the
1767  * display list compile dispatcher.
1768  */
1769 struct _glapi_table *
1770 _mesa_get_dispatch(GLcontext *ctx)
1771 {
1772    return ctx->CurrentDispatch;
1773 }
1774
1775
1776
1777 /**********************************************************************/
1778 /*****                Miscellaneous functions                     *****/
1779 /**********************************************************************/
1780
1781
1782 /*
1783  * This function is called when the Mesa user has stumbled into a code
1784  * path which may not be implemented fully or correctly.
1785  */
1786 void gl_problem( const GLcontext *ctx, const char *s )
1787 {
1788    fprintf( stderr, "Mesa implementation error: %s\n", s );
1789    fprintf( stderr, "Report to mesa-bugs@mesa3d.org\n" );
1790    (void) ctx;
1791 }
1792
1793
1794
1795 /*
1796  * This is called to inform the user that he or she has tried to do
1797  * something illogical or if there's likely a bug in their program
1798  * (like enabled depth testing without a depth buffer).
1799  */
1800 void gl_warning( const GLcontext *ctx, const char *s )
1801 {
1802    GLboolean debug;
1803 #ifdef DEBUG
1804    debug = GL_TRUE;
1805 #else
1806    if (getenv("MESA_DEBUG")) {
1807       debug = GL_TRUE;
1808    }
1809    else {
1810       debug = GL_FALSE;
1811    }
1812 #endif
1813    if (debug) {
1814       fprintf( stderr, "Mesa warning: %s\n", s );
1815    }
1816    (void) ctx;
1817 }
1818
1819
1820
1821 /*
1822  * Compile an error into current display list.
1823  */
1824 void gl_compile_error( GLcontext *ctx, GLenum error, const char *s )
1825 {
1826    if (ctx->CompileFlag)
1827       gl_save_error( ctx, error, s );
1828
1829    if (ctx->ExecuteFlag)
1830       gl_error( ctx, error, s );
1831 }
1832
1833
1834
1835 /*
1836  * This is Mesa's error handler.  Normally, all that's done is the updating
1837  * of the current error value.  If Mesa is compiled with -DDEBUG or if the
1838  * environment variable "MESA_DEBUG" is defined then a real error message
1839  * is printed to stderr.
1840  * Input:  error - the error value
1841  *         s - a diagnostic string
1842  */
1843 void gl_error( GLcontext *ctx, GLenum error, const char *s )
1844 {
1845    GLboolean debug;
1846
1847 #ifdef DEBUG
1848    debug = GL_TRUE;
1849 #else
1850    if (getenv("MESA_DEBUG")) {
1851       debug = GL_TRUE;
1852    }
1853    else {
1854       debug = GL_FALSE;
1855    }
1856 #endif
1857
1858    if (debug) {
1859       char errstr[1000];
1860
1861       switch (error) {
1862          case GL_NO_ERROR:
1863             strcpy( errstr, "GL_NO_ERROR" );
1864             break;
1865          case GL_INVALID_VALUE:
1866             strcpy( errstr, "GL_INVALID_VALUE" );
1867             break;
1868          case GL_INVALID_ENUM:
1869             strcpy( errstr, "GL_INVALID_ENUM" );
1870             break;
1871          case GL_INVALID_OPERATION:
1872             strcpy( errstr, "GL_INVALID_OPERATION" );
1873             break;
1874          case GL_STACK_OVERFLOW:
1875             strcpy( errstr, "GL_STACK_OVERFLOW" );
1876             break;
1877          case GL_STACK_UNDERFLOW:
1878             strcpy( errstr, "GL_STACK_UNDERFLOW" );
1879             break;
1880          case GL_OUT_OF_MEMORY:
1881             strcpy( errstr, "GL_OUT_OF_MEMORY" );
1882             break;
1883          default:
1884             strcpy( errstr, "unknown" );
1885             break;
1886       }
1887       fprintf( stderr, "Mesa user error: %s in %s\n", errstr, s );
1888    }
1889
1890    if (ctx->ErrorValue==GL_NO_ERROR) {
1891       ctx->ErrorValue = error;
1892    }
1893
1894    /* Call device driver's error handler, if any.  This is used on the Mac. */
1895    if (ctx->Driver.Error) {
1896       (*ctx->Driver.Error)( ctx );
1897    }
1898 }
1899
1900
1901
1902 void
1903 _mesa_Finish( void )
1904 {
1905    GET_CURRENT_CONTEXT(ctx);
1906    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glFinish");
1907    if (ctx->Driver.Finish) {
1908       (*ctx->Driver.Finish)( ctx );
1909    }
1910 }
1911
1912
1913
1914 void
1915 _mesa_Flush( void )
1916 {
1917    GET_CURRENT_CONTEXT(ctx);
1918    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glFlush");
1919    if (ctx->Driver.Flush) {
1920       (*ctx->Driver.Flush)( ctx );
1921    }
1922 }