src/mesa/tnl/t_imm_exec.c

   1 /* $Id: t_imm_exec.c,v 1.43 2002/10/24 23:57:25 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  4.1
   6  *
   7  * Copyright (C) 1999-2002  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  * \file tnl/t_imm_exec.c
  29  * \brief Setup to execute immediate-mode vertex data.
  30  * \author Keith Whitwell
  31  */
  32
  33 #include "glheader.h"
  34 #include "colormac.h"
  35 #include "context.h"
  36 #include "enums.h"
  37 #include "dlist.h"
  38 #include "macros.h"
  39 #include "imports.h"
  40 #include "mmath.h"
  41 #include "light.h"
  42 #include "state.h"
  43 #include "mtypes.h"
  44
  45 #include "math/m_matrix.h"
  46 #include "math/m_xform.h"
  47
  48 #include "t_context.h"
  49 #include "t_array_import.h"
  50 #include "t_imm_alloc.h"
  51 #include "t_imm_api.h"
  52 #include "t_imm_debug.h"
  53 #include "t_imm_dlist.h"
  54 #include "t_imm_eval.h"
  55 #include "t_imm_elt.h"
  56 #include "t_imm_exec.h"
  57 #include "t_imm_fixup.h"
  58 #include "t_pipeline.h"
  59
  60
  61
  62 static void reset_input( GLcontext *ctx,
  63                          GLuint start,
  64                          GLuint beginstate,
  65                          GLuint savedbeginstate )
  66 {
  67    struct immediate *IM = TNL_CURRENT_IM(ctx);
  68
  69    /* Clear the dirty part of the flag array.
  70     */
  71    if (start < IM->Count+2)
  72       MEMSET(IM->Flag + start, 0, sizeof(GLuint) * (IM->Count+2-start));
  73
  74    if (MESA_VERBOSE & VERBOSE_IMMEDIATE)
  75       _mesa_debug(ctx, "reset_input: IM(%d) new %x\n", IM->id, beginstate);
  76
  77    IM->Start = start;
  78    IM->Count = start;
  79    IM->LastMaterial = start;
  80    IM->BeginState = beginstate;
  81    IM->SavedBeginState = savedbeginstate;
  82    IM->TexSize = 0;
  83    IM->MaterialOrMask = 0;
  84
  85    if (IM->MaterialMask)
  86       IM->MaterialMask[IM->Start] = 0;
  87
  88    IM->ArrayEltFlags = ~ctx->Array._Enabled;
  89    IM->ArrayEltIncr = ctx->Array.Vertex.Enabled ? 1 : 0;
  90    IM->ArrayEltFlush = ctx->Array.LockCount ? FLUSH_ELT_LAZY : FLUSH_ELT_EAGER;
  91 }
  92
  93 void _tnl_reset_exec_input( GLcontext *ctx,
  94                             GLuint start,
  95                             GLuint beginstate,
  96                             GLuint savedbeginstate )
  97 {
  98    TNLcontext *tnl = TNL_CONTEXT(ctx);
  99    struct immediate *IM = TNL_CURRENT_IM(ctx);
 100
 101    reset_input( ctx, start, beginstate, savedbeginstate );
 102
 103    IM->CopyStart = start - tnl->ExecCopyCount;
 104
 105    IM->Primitive[IM->CopyStart] = ctx->Driver.CurrentExecPrimitive;
 106    if (tnl->ExecParity)
 107       IM->Primitive[IM->CopyStart] |= PRIM_PARITY;
 108
 109    IM->LastPrimitive = IM->CopyStart;
 110 }
 111
 112
 113 void _tnl_reset_compile_input( GLcontext *ctx,
 114                             GLuint start,
 115                             GLuint beginstate,
 116                             GLuint savedbeginstate )
 117 {
 118    struct immediate *IM = TNL_CURRENT_IM(ctx);
 119
 120    reset_input( ctx, start, beginstate, savedbeginstate );
 121    IM->CopyStart = start;
 122    IM->LastPrimitive = IM->Start;
 123 }
 124
 125
 126 /**
 127  * Copy the last specified normal, color, texcoord, edge flag, etc
 128  * from the immediate struct into the ctx->Current attribute group.
 129  */
 130 void _tnl_copy_to_current( GLcontext *ctx, struct immediate *IM,
 131                            GLuint flag, GLuint count )
 132 {
 133    if (MESA_VERBOSE&VERBOSE_IMMEDIATE)
 134       _tnl_print_vert_flags("copy to current", flag);
 135
 136    /* XXX should be able to replace these conditions with a loop over
 137     * the 16 vertex attributes.
 138     */
 139    if (flag & VERT_BIT_NORMAL)
 140       COPY_4FV( ctx->Current.Attrib[VERT_ATTRIB_NORMAL],
 141                 IM->Attrib[VERT_ATTRIB_NORMAL][count]);
 142
 143    if (flag & VERT_BIT_INDEX)
 144       ctx->Current.Index = IM->Index[count];
 145
 146    if (flag & VERT_BIT_EDGEFLAG)
 147       ctx->Current.EdgeFlag = IM->EdgeFlag[count];
 148
 149    if (flag & VERT_BIT_COLOR0) {
 150       COPY_4FV(ctx->Current.Attrib[VERT_ATTRIB_COLOR0],
 151                IM->Attrib[VERT_ATTRIB_COLOR0][count]);
 152       if (ctx->Light.ColorMaterialEnabled) {
 153          _mesa_update_color_material( ctx,
 154                                    ctx->Current.Attrib[VERT_ATTRIB_COLOR0] );
 155          TNL_CONTEXT(ctx)->Driver.NotifyMaterialChange( ctx );
 156       }
 157    }
 158
 159    if (flag & VERT_BIT_COLOR1)
 160       COPY_4FV(ctx->Current.Attrib[VERT_ATTRIB_COLOR1],
 161                IM->Attrib[VERT_ATTRIB_COLOR1][count]);
 162
 163    if (flag & VERT_BIT_FOG)
 164       ctx->Current.Attrib[VERT_ATTRIB_FOG][0] = IM->Attrib[VERT_ATTRIB_FOG][count][0];
 165
 166    if (flag & VERT_BITS_TEX_ANY) {
 167       GLuint i;
 168       for (i = 0 ; i < ctx->Const.MaxTextureUnits ; i++) {
 169          if (flag & VERT_BIT_TEX(i)) {
 170             COPY_4FV( ctx->Current.Attrib[VERT_ATTRIB_TEX0 + i],
 171                       IM->Attrib[VERT_ATTRIB_TEX0 + i][count]);
 172          }
 173       }
 174    }
 175
 176    if (flag & VERT_BIT_MATERIAL) {
 177       _mesa_update_material( ctx,
 178                           IM->Material[IM->LastMaterial],
 179                           IM->MaterialOrMask );
 180
 181       TNL_CONTEXT(ctx)->Driver.NotifyMaterialChange( ctx );
 182    }
 183 }
 184
 185
 186
 187 void _tnl_compute_orflag( struct immediate *IM, GLuint start )
 188 {
 189    GLuint count = IM->Count;
 190    GLuint orflag = 0;
 191    GLuint andflag = ~0U;
 192    GLuint i;
 193
 194    IM->LastData = count-1;
 195
 196
 197    /* Compute the flags for the whole buffer.
 198     */
 199    for (i = start ; i < count ; i++) {
 200       andflag &= IM->Flag[i];
 201       orflag |= IM->Flag[i];
 202    }
 203
 204    /* It is possible there will be data in the buffer arising from
 205     * calls like 'glNormal', 'glMaterial' that occur after the final
 206     * glVertex, glEval, etc.  Additionally, a buffer can consist of
 207     * eg. a single glMaterial call, in which case IM->Start ==
 208     * IM->Count, but the buffer is definitely not empty.
 209     */
 210    if (IM->Flag[i] & VERT_BITS_DATA) {
 211       IM->LastData++;
 212       orflag |= IM->Flag[i];
 213    }
 214
 215    IM->Flag[IM->LastData+1] |= VERT_BIT_END_VB;
 216    IM->CopyAndFlag = IM->AndFlag = andflag;
 217    IM->OrFlag = orflag;
 218    IM->CopyOrFlag = orflag;
 219    IM->Evaluated = 0;
 220 }
 221
 222
 223 /**
 224  * This is where the vertex data is transfered from the 'struct immediate
 225  * into the 'struct vertex_buffer'.
 226  *
 227  * Note: The 'start' member of the GLvector structs is now redundant
 228  * because we always re-transform copied vertices, and the vectors
 229  * below are set up so that the first copied vertex (if any) appears
 230  * at position zero.
 231  */
 232 static void _tnl_vb_bind_immediate( GLcontext *ctx, struct immediate *IM )
 233 {
 234    TNLcontext *tnl = TNL_CONTEXT(ctx);
 235    struct vertex_buffer *VB = &tnl->vb;
 236    struct vertex_arrays *tmp = &tnl->imm_inputs;
 237    GLuint inputs = tnl->pipeline.inputs; /* for copy-to-current */
 238    const GLuint start = IM->CopyStart;
 239    const GLuint count = IM->Count - start;
 240
 241    /* TODO: optimize the case where nothing has changed.  (Just bind
 242     * tmp to vb).
 243     */
 244
 245    /* Setup constant data in the VB.
 246     */
 247    VB->Count = count;
 248    VB->FirstClipped = IMM_MAXDATA - IM->CopyStart;
 249    VB->import_data = NULL;
 250    VB->importable_data = 0;
 251
 252    /* Need an IM->FirstPrimitive?
 253     */
 254    VB->Primitive = IM->Primitive + IM->CopyStart;
 255    VB->PrimitiveLength = IM->PrimitiveLength + IM->CopyStart;
 256    VB->FirstPrimitive = 0;
 257
 258    VB->Flag = IM->Flag + start;
 259
 260    /* TexCoordPtr's are zeroed in loop below.
 261     */
 262    VB->NormalPtr = NULL;
 263    VB->NormalLengthPtr = NULL;
 264    VB->EdgeFlag = NULL;
 265    VB->IndexPtr[0] = NULL;
 266    VB->IndexPtr[1] = NULL;
 267    VB->ColorPtr[0] = NULL;
 268    VB->ColorPtr[1] = NULL;
 269    VB->SecondaryColorPtr[0] = NULL;
 270    VB->SecondaryColorPtr[1] = NULL;
 271    VB->Elts = NULL;
 272    VB->MaterialMask = NULL;
 273    VB->Material = NULL;
 274
 275 /*     _tnl_print_vert_flags("copy-orflag", IM->CopyOrFlag); */
 276 /*     _tnl_print_vert_flags("orflag", IM->OrFlag); */
 277 /*     _tnl_print_vert_flags("inputs", inputs); */
 278
 279    /* Setup the initial values of array pointers in the vb.
 280     */
 281    if (inputs & VERT_BIT_POS) {
 282       tmp->Obj.data = IM->Attrib[VERT_ATTRIB_POS] + start;
 283       tmp->Obj.start = (GLfloat *)(IM->Attrib[VERT_ATTRIB_POS] + start);
 284       tmp->Obj.count = count;
 285       VB->ObjPtr = &tmp->Obj;
 286       if ((IM->CopyOrFlag & VERT_BITS_OBJ_234) == VERT_BITS_OBJ_234)
 287          tmp->Obj.size = 4;
 288       else if ((IM->CopyOrFlag & VERT_BITS_OBJ_234) == VERT_BITS_OBJ_23)
 289          tmp->Obj.size = 3;
 290       else
 291          tmp->Obj.size = 2;
 292    }
 293
 294    if (inputs & VERT_BIT_NORMAL) {
 295       tmp->Normal.data = IM->Attrib[VERT_ATTRIB_NORMAL] + start;
 296       tmp->Normal.start = (GLfloat *) (IM->Attrib[VERT_ATTRIB_NORMAL] + start);
 297       tmp->Normal.count = count;
 298       tmp->Normal.size = 3; /* just to be safe */
 299       VB->NormalPtr = &tmp->Normal;
 300       if (IM->NormalLengthPtr)
 301          VB->NormalLengthPtr = IM->NormalLengthPtr + start;
 302    }
 303
 304    if (inputs & VERT_BIT_INDEX) {
 305       tmp->Index.count = count;
 306       tmp->Index.data = IM->Index + start;
 307       tmp->Index.start = IM->Index + start;
 308       VB->IndexPtr[0] = &tmp->Index;
 309    }
 310
 311    if (inputs & VERT_BIT_FOG) {
 312       tmp->FogCoord.data = IM->Attrib[VERT_ATTRIB_FOG] + start;
 313       tmp->FogCoord.start = (GLfloat *) (IM->Attrib[VERT_ATTRIB_FOG] + start);
 314       tmp->FogCoord.count = count;
 315       VB->FogCoordPtr = &tmp->FogCoord;
 316    }
 317
 318    if (inputs & VERT_BIT_COLOR1) {
 319       tmp->SecondaryColor.Ptr = IM->Attrib[VERT_ATTRIB_COLOR1] + start;
 320       VB->SecondaryColorPtr[0] = &tmp->SecondaryColor;
 321    }
 322
 323    if (inputs & VERT_BIT_EDGEFLAG) {
 324       VB->EdgeFlag = IM->EdgeFlag + start;
 325    }
 326
 327    if (inputs & VERT_BIT_COLOR0) {
 328       if (IM->CopyOrFlag & VERT_BIT_COLOR0) {
 329          tmp->Color.Ptr = IM->Attrib[VERT_ATTRIB_COLOR0] + start;
 330          tmp->Color.StrideB = 4 * sizeof(GLfloat);
 331          tmp->Color.Flags = 0;
 332       }
 333       else {
 334          tmp->Color.Ptr = ctx->Current.Attrib[VERT_ATTRIB_COLOR0];
 335          tmp->Color.StrideB = 0;
 336          tmp->Color.Flags = CA_CLIENT_DATA; /* hack */
 337          VB->import_source = IM;
 338          VB->importable_data |= VERT_BIT_COLOR0;
 339          VB->import_data = _tnl_upgrade_current_data;
 340       }
 341       VB->ColorPtr[0] = &tmp->Color;
 342    }
 343
 344    if (inputs & VERT_BITS_TEX_ANY) {
 345       GLuint i;
 346       for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
 347          VB->TexCoordPtr[i] = NULL;
 348          if (inputs & VERT_BIT_TEX(i)) {
 349             tmp->TexCoord[i].count = count;
 350             tmp->TexCoord[i].data = IM->Attrib[VERT_ATTRIB_TEX0 + i] + start;
 351             tmp->TexCoord[i].start = (GLfloat *)(IM->Attrib[VERT_ATTRIB_TEX0 + i] + start);
 352             tmp->TexCoord[i].size = 2;
 353             if (IM->TexSize & TEX_SIZE_3(i)) {
 354                tmp->TexCoord[i].size = 3;
 355                if (IM->TexSize & TEX_SIZE_4(i))
 356                   tmp->TexCoord[i].size = 4;
 357             }
 358             VB->TexCoordPtr[i] = &tmp->TexCoord[i];
 359          }
 360       }
 361    }
 362
 363    if ((inputs & IM->OrFlag & VERT_BIT_MATERIAL) && IM->Material) {
 364       VB->MaterialMask = IM->MaterialMask + start;
 365       VB->Material = IM->Material + start;
 366    }
 367
 368    /* GL_NV_vertex_program */
 369    if (ctx->VertexProgram.Enabled) {
 370       GLuint attr;
 371       for (attr = 0; attr < VERT_ATTRIB_MAX; attr++) {
 372          tmp->Attribs[attr].count = count;
 373          tmp->Attribs[attr].data = IM->Attrib[attr] + start;
 374          tmp->Attribs[attr].start = (GLfloat *) (IM->Attrib[attr] + start);
 375          tmp->Attribs[attr].size = 4;
 376          VB->AttribPtr[attr] = &(tmp->Attribs[attr]);
 377       }
 378    }
 379 }
 380
 381
 382
 383
 384 /**
 385  * Called by exec_vert_cassette, execute_compiled_cassette, but not
 386  * exec_elt_cassette.
 387  */
 388 void _tnl_run_cassette( GLcontext *ctx, struct immediate *IM )
 389 {
 390    TNLcontext *tnl = TNL_CONTEXT(ctx);
 391
 392    _tnl_vb_bind_immediate( ctx, IM );
 393
 394    if (IM->OrFlag & VERT_BITS_EVAL_ANY)
 395       _tnl_eval_immediate( ctx, IM );
 396
 397    /* Invalidate all stored data before and after run:
 398     */
 399    tnl->pipeline.run_input_changes |= tnl->pipeline.inputs;
 400    tnl->Driver.RunPipeline( ctx );
 401    tnl->pipeline.run_input_changes |= tnl->pipeline.inputs;
 402
 403    _tnl_copy_to_current( ctx, IM, IM->OrFlag, IM->LastData );
 404 }
 405
 406
 407 /**
 408  * Called for regular vertex cassettes.
 409  */
 410 static void exec_vert_cassette( GLcontext *ctx, struct immediate *IM )
 411 {
 412    if (IM->FlushElt) {
 413       /* Orflag is computed twice, but only reach this code if app is
 414        * using a mixture of glArrayElement() and glVertex() while
 415        * arrays are locked (else would be in exec_elt_cassette now).
 416        */
 417       ASSERT(ctx->Array.LockCount);
 418       ASSERT(IM->FlushElt == FLUSH_ELT_LAZY);
 419       _tnl_translate_array_elts( ctx, IM, IM->CopyStart, IM->Count );
 420       _tnl_compute_orflag( IM, IM->CopyStart );
 421    }
 422
 423    _tnl_fixup_input( ctx, IM );
 424 /*     _tnl_print_cassette( IM ); */
 425    _tnl_run_cassette( ctx, IM );
 426 }
 427
 428
 429 /* Called for pure, locked VERT_BIT_ELT cassettes instead of
 430  * _tnl_run_cassette.
 431  */
 432 static void exec_elt_cassette( GLcontext *ctx, struct immediate *IM )
 433 {
 434    TNLcontext *tnl = TNL_CONTEXT(ctx);
 435    struct vertex_buffer *VB = &tnl->vb;
 436
 437    _tnl_vb_bind_arrays( ctx, ctx->Array.LockFirst, ctx->Array.LockCount );
 438
 439    /* Take only elements and primitive information from the immediate:
 440     */
 441    VB->Elts = IM->Elt + IM->CopyStart;
 442    VB->Primitive = IM->Primitive + IM->CopyStart;
 443    VB->PrimitiveLength = IM->PrimitiveLength + IM->CopyStart;
 444    VB->FirstPrimitive = 0;
 445
 446    /* Run the pipeline.  No input changes as a result of this action.
 447     */
 448    tnl->Driver.RunPipeline( ctx );
 449
 450    /* Still need to update current values:
 451     */
 452    if (ctx->Driver.CurrentExecPrimitive == GL_POLYGON+1) {
 453       _tnl_translate_array_elts( ctx, IM, IM->LastData, IM->LastData );
 454       _tnl_copy_to_current( ctx, IM, ctx->Array._Enabled, IM->LastData );
 455    }
 456 }
 457
 458
 459 static void
 460 exec_empty_cassette( GLcontext *ctx, struct immediate *IM )
 461 {
 462    if (IM->FlushElt)
 463       _tnl_translate_array_elts( ctx, IM, IM->CopyStart, IM->CopyStart );
 464
 465    _tnl_copy_to_current( ctx, IM, IM->OrFlag, IM->LastData );
 466 }
 467
 468
 469
 470 /**
 471  * Called for all cassettes when not compiling or playing a display
 472  * list.
 473  */
 474 void _tnl_execute_cassette( GLcontext *ctx, struct immediate *IM )
 475 {
 476    TNLcontext *tnl = TNL_CONTEXT(ctx);
 477
 478    _tnl_compute_orflag( IM, IM->Start );
 479    _tnl_copy_immediate_vertices( ctx, IM );
 480    _tnl_get_exec_copy_verts( ctx, IM );
 481
 482    if (tnl->pipeline.build_state_changes)
 483       _tnl_validate_pipeline( ctx );
 484
 485    if (IM->CopyStart == IM->Count) {
 486       exec_empty_cassette( ctx, IM );
 487    }
 488    else if ((IM->CopyOrFlag & VERT_BITS_DATA) == VERT_BIT_ELT &&
 489             ctx->Array.LockCount &&
 490             ctx->Array.Vertex.Enabled) {
 491       exec_elt_cassette( ctx, IM );
 492    }
 493    else {
 494       exec_vert_cassette( ctx, IM );
 495    }
 496
 497    /* Only reuse the immediate if there are no copied vertices living
 498     * inside it:
 499     */
 500    {
 501       GLuint begin_state = IM->BeginState & (VERT_BEGIN_0|VERT_BEGIN_1);
 502       GLuint saved_begin_state = IM->SavedBeginState;
 503
 504       if (--IM->ref_count != 0) {
 505          IM = _tnl_alloc_immediate( ctx );
 506          SET_IMMEDIATE( ctx, IM );
 507       }
 508
 509       IM->ref_count++;
 510
 511       _tnl_reset_exec_input( ctx, IMM_MAX_COPIED_VERTS,
 512                              begin_state, saved_begin_state );
 513    }
 514
 515    if (ctx->Driver.CurrentExecPrimitive == GL_POLYGON+1)
 516       ctx->Driver.NeedFlush &= ~FLUSH_STORED_VERTICES;
 517 }
 518
 519
 520
 521
 522 /**
 523  * Setup vector pointers that will be used to bind immediates to VB's.
 524  */
 525 void _tnl_imm_init( GLcontext *ctx )
 526 {
 527    TNLcontext *tnl = TNL_CONTEXT(ctx);
 528    struct vertex_arrays *tmp = &tnl->imm_inputs;
 529    GLuint i;
 530    static int firsttime = 1;
 531
 532    if (firsttime) {
 533       firsttime = 0;
 534       _tnl_imm_elt_init();
 535    }
 536
 537    ctx->swtnl_im = _tnl_alloc_immediate( ctx );
 538    TNL_CURRENT_IM(ctx)->ref_count++;
 539
 540    tnl->ExecCopyTexSize = 0;
 541    tnl->ExecCopyCount = 0;
 542    tnl->ExecCopySource = 0;
 543
 544    TNL_CURRENT_IM(ctx)->CopyStart = IMM_MAX_COPIED_VERTS;
 545
 546    _mesa_vector4f_init( &tmp->Obj, 0, 0 );
 547    _mesa_vector4f_init( &tmp->Normal, 0, 0 );
 548
 549    tmp->Color.Ptr = NULL;
 550    tmp->Color.Type = GL_FLOAT;
 551    tmp->Color.Size = 4;
 552    tmp->Color.Stride = 0;
 553    tmp->Color.StrideB = 4 * sizeof(GLfloat);
 554    tmp->Color.Flags = 0;
 555
 556    tmp->SecondaryColor.Ptr = NULL;
 557    tmp->SecondaryColor.Type = GL_FLOAT;
 558    tmp->SecondaryColor.Size = 4;
 559    tmp->SecondaryColor.Stride = 0;
 560    tmp->SecondaryColor.StrideB = 4 * sizeof(GLfloat);
 561    tmp->SecondaryColor.Flags = 0;
 562
 563    _mesa_vector4f_init( &tmp->FogCoord, 0, 0 );
 564    _mesa_vector1ui_init( &tmp->Index, 0, 0 );
 565    _mesa_vector1ub_init( &tmp->EdgeFlag, 0, 0 );
 566
 567    for (i = 0; i < ctx->Const.MaxTextureUnits; i++)
 568       _mesa_vector4f_init( &tmp->TexCoord[i], 0, 0);
 569
 570    /* Install the first immediate.  Intially outside begin/end.
 571     */
 572    _tnl_reset_exec_input( ctx, IMM_MAX_COPIED_VERTS, 0, 0 );
 573    tnl->ReplayHardBeginEnd = 0;
 574
 575    _tnl_imm_vtxfmt_init( ctx );
 576 }
 577
 578
 579 /**
 580  * Deallocate the immediate-mode buffer for the given context, if
 581  * its reference count goes to zero.
 582  */
 583 void _tnl_imm_destroy( GLcontext *ctx )
 584 {
 585    if (TNL_CURRENT_IM(ctx)) {
 586       TNL_CURRENT_IM(ctx)->ref_count--;
 587       if (TNL_CURRENT_IM(ctx)->ref_count == 0)
 588          _tnl_free_immediate( ctx, TNL_CURRENT_IM(ctx) );
 589       /*
 590        * Don't use SET_IMMEDIATE here, or else we'll whack the
 591        * _tnl_CurrentInput pointer - not good when another
 592        * context has already been made current.
 593        * So we just set the context's own tnl immediate pointer
 594        * to 0.
 595        */
 596       ctx->swtnl_im = NULL;
 597    }
 598 }