reactos/dll/opengl/mesa/main/matrix.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.5
   4  *
   5  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   6  * Copyright (C) 2009  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 /**
  28  * \file matrix.c
  29  * Matrix operations.
  30  *
  31  * \note
  32  * -# 4x4 transformation matrices are stored in memory in column major order.
  33  * -# Points/vertices are to be thought of as column vectors.
  34  * -# Transformation of a point p by a matrix M is: p' = M * p
  35  */
  36
  37 #include <precomp.h>
  38
  39 /**
  40  * Apply a perspective projection matrix.
  41  *
  42  * \param left left clipping plane coordinate.
  43  * \param right right clipping plane coordinate.
  44  * \param bottom bottom clipping plane coordinate.
  45  * \param top top clipping plane coordinate.
  46  * \param nearval distance to the near clipping plane.
  47  * \param farval distance to the far clipping plane.
  48  *
  49  * \sa glFrustum().
  50  *
  51  * Flushes vertices and validates parameters. Calls _math_matrix_frustum() with
  52  * the top matrix of the current matrix stack and sets
  53  * __struct gl_contextRec::NewState.
  54  */
  55 void GLAPIENTRY
  56 _mesa_Frustum( GLdouble left, GLdouble right,
  57                GLdouble bottom, GLdouble top,
  58                GLdouble nearval, GLdouble farval )
  59 {
  60    GET_CURRENT_CONTEXT(ctx);
  61    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
  62
  63    if (nearval <= 0.0 ||
  64        farval <= 0.0 ||
  65        nearval == farval ||
  66        left == right ||
  67        top == bottom)
  68    {
  69       _mesa_error( ctx,  GL_INVALID_VALUE, "glFrustum" );
  70       return;
  71    }
  72
  73    _math_matrix_frustum( ctx->CurrentStack->Top,
  74                          (GLfloat) left, (GLfloat) right,
  75                          (GLfloat) bottom, (GLfloat) top,
  76                          (GLfloat) nearval, (GLfloat) farval );
  77    ctx->NewState |= ctx->CurrentStack->DirtyFlag;
  78 }
  79
  80
  81 /**
  82  * Apply an orthographic projection matrix.
  83  *
  84  * \param left left clipping plane coordinate.
  85  * \param right right clipping plane coordinate.
  86  * \param bottom bottom clipping plane coordinate.
  87  * \param top top clipping plane coordinate.
  88  * \param nearval distance to the near clipping plane.
  89  * \param farval distance to the far clipping plane.
  90  *
  91  * \sa glOrtho().
  92  *
  93  * Flushes vertices and validates parameters. Calls _math_matrix_ortho() with
  94  * the top matrix of the current matrix stack and sets
  95  * __struct gl_contextRec::NewState.
  96  */
  97 void GLAPIENTRY
  98 _mesa_Ortho( GLdouble left, GLdouble right,
  99              GLdouble bottom, GLdouble top,
 100              GLdouble nearval, GLdouble farval )
 101 {
 102    GET_CURRENT_CONTEXT(ctx);
 103    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 104
 105    if (MESA_VERBOSE & VERBOSE_API)
 106       _mesa_debug(ctx, "glOrtho(%f, %f, %f, %f, %f, %f)\n",
 107                   left, right, bottom, top, nearval, farval);
 108
 109    if (left == right ||
 110        bottom == top ||
 111        nearval == farval)
 112    {
 113       _mesa_error( ctx,  GL_INVALID_VALUE, "glOrtho" );
 114       return;
 115    }
 116
 117    _math_matrix_ortho( ctx->CurrentStack->Top,
 118                        (GLfloat) left, (GLfloat) right,
 119                        (GLfloat) bottom, (GLfloat) top,
 120                        (GLfloat) nearval, (GLfloat) farval );
 121    ctx->NewState |= ctx->CurrentStack->DirtyFlag;
 122 }
 123
 124
 125 /**
 126  * Set the current matrix stack.
 127  *
 128  * \param mode matrix stack.
 129  *
 130  * \sa glMatrixMode().
 131  *
 132  * Flushes the vertices, validates the parameter and updates
 133  * __struct gl_contextRec::CurrentStack and gl_transform_attrib::MatrixMode
 134  * with the specified matrix stack.
 135  */
 136 void GLAPIENTRY
 137 _mesa_MatrixMode( GLenum mode )
 138 {
 139    GET_CURRENT_CONTEXT(ctx);
 140    ASSERT_OUTSIDE_BEGIN_END(ctx);
 141
 142    if (ctx->Transform.MatrixMode == mode && mode != GL_TEXTURE)
 143       return;
 144    FLUSH_VERTICES(ctx, _NEW_TRANSFORM);
 145
 146    switch (mode) {
 147    case GL_MODELVIEW:
 148       ctx->CurrentStack = &ctx->ModelviewMatrixStack;
 149       break;
 150    case GL_PROJECTION:
 151       ctx->CurrentStack = &ctx->ProjectionMatrixStack;
 152       break;
 153    case GL_TEXTURE:
 154       ctx->CurrentStack = &ctx->TextureMatrixStack;
 155       break;
 156    default:
 157       _mesa_error( ctx,  GL_INVALID_ENUM, "glMatrixMode(mode)" );
 158       return;
 159    }
 160
 161    ctx->Transform.MatrixMode = mode;
 162 }
 163
 164
 165 /**
 166  * Push the current matrix stack.
 167  *
 168  * \sa glPushMatrix().
 169  *
 170  * Verifies the current matrix stack is not full, and duplicates the top-most
 171  * matrix in the stack.
 172  * Marks __struct gl_contextRec::NewState with the stack dirty flag.
 173  */
 174 void GLAPIENTRY
 175 _mesa_PushMatrix( void )
 176 {
 177    GET_CURRENT_CONTEXT(ctx);
 178    struct gl_matrix_stack *stack = ctx->CurrentStack;
 179    ASSERT_OUTSIDE_BEGIN_END(ctx);
 180
 181    if (MESA_VERBOSE&VERBOSE_API)
 182       _mesa_debug(ctx, "glPushMatrix %s\n",
 183                   _mesa_lookup_enum_by_nr(ctx->Transform.MatrixMode));
 184
 185    if (stack->Depth + 1 >= stack->MaxDepth) {
 186       if (ctx->Transform.MatrixMode == GL_TEXTURE) {
 187          _mesa_error(ctx,  GL_STACK_OVERFLOW,
 188                      "glPushMatrix(mode=GL_TEXTURE)");
 189       }
 190       else {
 191          _mesa_error(ctx,  GL_STACK_OVERFLOW, "glPushMatrix(mode=%s)",
 192                      _mesa_lookup_enum_by_nr(ctx->Transform.MatrixMode));
 193       }
 194       return;
 195    }
 196    _math_matrix_copy( &stack->Stack[stack->Depth + 1],
 197                       &stack->Stack[stack->Depth] );
 198    stack->Depth++;
 199    stack->Top = &(stack->Stack[stack->Depth]);
 200    ctx->NewState |= stack->DirtyFlag;
 201 }
 202
 203
 204 /**
 205  * Pop the current matrix stack.
 206  *
 207  * \sa glPopMatrix().
 208  *
 209  * Flushes the vertices, verifies the current matrix stack is not empty, and
 210  * moves the stack head down.
 211  * Marks __struct gl_contextRec::NewState with the dirty stack flag.
 212  */
 213 void GLAPIENTRY
 214 _mesa_PopMatrix( void )
 215 {
 216    GET_CURRENT_CONTEXT(ctx);
 217    struct gl_matrix_stack *stack = ctx->CurrentStack;
 218    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 219
 220    if (MESA_VERBOSE&VERBOSE_API)
 221       _mesa_debug(ctx, "glPopMatrix %s\n",
 222                   _mesa_lookup_enum_by_nr(ctx->Transform.MatrixMode));
 223
 224    if (stack->Depth == 0) {
 225       if (ctx->Transform.MatrixMode == GL_TEXTURE) {
 226          _mesa_error(ctx,  GL_STACK_UNDERFLOW,
 227                      "glPopMatrix(mode=GL_TEXTURE)");
 228       }
 229       else {
 230          _mesa_error(ctx,  GL_STACK_UNDERFLOW, "glPopMatrix(mode=%s)",
 231                      _mesa_lookup_enum_by_nr(ctx->Transform.MatrixMode));
 232       }
 233       return;
 234    }
 235    stack->Depth--;
 236    stack->Top = &(stack->Stack[stack->Depth]);
 237    ctx->NewState |= stack->DirtyFlag;
 238 }
 239
 240
 241 /**
 242  * Replace the current matrix with the identity matrix.
 243  *
 244  * \sa glLoadIdentity().
 245  *
 246  * Flushes the vertices and calls _math_matrix_set_identity() with the
 247  * top-most matrix in the current stack.
 248  * Marks __struct gl_contextRec::NewState with the stack dirty flag.
 249  */
 250 void GLAPIENTRY
 251 _mesa_LoadIdentity( void )
 252 {
 253    GET_CURRENT_CONTEXT(ctx);
 254    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 255
 256    if (MESA_VERBOSE & VERBOSE_API)
 257       _mesa_debug(ctx, "glLoadIdentity()\n");
 258
 259    _math_matrix_set_identity( ctx->CurrentStack->Top );
 260    ctx->NewState |= ctx->CurrentStack->DirtyFlag;
 261 }
 262
 263
 264 /**
 265  * Replace the current matrix with a given matrix.
 266  *
 267  * \param m matrix.
 268  *
 269  * \sa glLoadMatrixf().
 270  *
 271  * Flushes the vertices and calls _math_matrix_loadf() with the top-most
 272  * matrix in the current stack and the given matrix.
 273  * Marks __struct gl_contextRec::NewState with the dirty stack flag.
 274  */
 275 void GLAPIENTRY
 276 _mesa_LoadMatrixf( const GLfloat *m )
 277 {
 278    GET_CURRENT_CONTEXT(ctx);
 279    if (!m) return;
 280    if (MESA_VERBOSE & VERBOSE_API)
 281       _mesa_debug(ctx,
 282           "glLoadMatrix(%f %f %f %f, %f %f %f %f, %f %f %f %f, %f %f %f %f\n",
 283           m[0], m[4], m[8], m[12],
 284           m[1], m[5], m[9], m[13],
 285           m[2], m[6], m[10], m[14],
 286           m[3], m[7], m[11], m[15]);
 287
 288    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 289    _math_matrix_loadf( ctx->CurrentStack->Top, m );
 290    ctx->NewState |= ctx->CurrentStack->DirtyFlag;
 291 }
 292
 293
 294 /**
 295  * Multiply the current matrix with a given matrix.
 296  *
 297  * \param m matrix.
 298  *
 299  * \sa glMultMatrixf().
 300  *
 301  * Flushes the vertices and calls _math_matrix_mul_floats() with the top-most
 302  * matrix in the current stack and the given matrix. Marks
 303  * __struct gl_contextRec::NewState with the dirty stack flag.
 304  */
 305 void GLAPIENTRY
 306 _mesa_MultMatrixf( const GLfloat *m )
 307 {
 308    GET_CURRENT_CONTEXT(ctx);
 309    if (!m) return;
 310    if (MESA_VERBOSE & VERBOSE_API)
 311       _mesa_debug(ctx,
 312           "glMultMatrix(%f %f %f %f, %f %f %f %f, %f %f %f %f, %f %f %f %f\n",
 313           m[0], m[4], m[8], m[12],
 314           m[1], m[5], m[9], m[13],
 315           m[2], m[6], m[10], m[14],
 316           m[3], m[7], m[11], m[15]);
 317    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 318    _math_matrix_mul_floats( ctx->CurrentStack->Top, m );
 319    ctx->NewState |= ctx->CurrentStack->DirtyFlag;
 320 }
 321
 322
 323 /**
 324  * Multiply the current matrix with a rotation matrix.
 325  *
 326  * \param angle angle of rotation, in degrees.
 327  * \param x rotation vector x coordinate.
 328  * \param y rotation vector y coordinate.
 329  * \param z rotation vector z coordinate.
 330  *
 331  * \sa glRotatef().
 332  *
 333  * Flushes the vertices and calls _math_matrix_rotate() with the top-most
 334  * matrix in the current stack and the given parameters. Marks
 335  * __struct gl_contextRec::NewState with the dirty stack flag.
 336  */
 337 void GLAPIENTRY
 338 _mesa_Rotatef( GLfloat angle, GLfloat x, GLfloat y, GLfloat z )
 339 {
 340    GET_CURRENT_CONTEXT(ctx);
 341    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 342    if (angle != 0.0F) {
 343       _math_matrix_rotate( ctx->CurrentStack->Top, angle, x, y, z);
 344       ctx->NewState |= ctx->CurrentStack->DirtyFlag;
 345    }
 346 }
 347
 348
 349 /**
 350  * Multiply the current matrix with a general scaling matrix.
 351  *
 352  * \param x x axis scale factor.
 353  * \param y y axis scale factor.
 354  * \param z z axis scale factor.
 355  *
 356  * \sa glScalef().
 357  *
 358  * Flushes the vertices and calls _math_matrix_scale() with the top-most
 359  * matrix in the current stack and the given parameters. Marks
 360  * __struct gl_contextRec::NewState with the dirty stack flag.
 361  */
 362 void GLAPIENTRY
 363 _mesa_Scalef( GLfloat x, GLfloat y, GLfloat z )
 364 {
 365    GET_CURRENT_CONTEXT(ctx);
 366    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 367    _math_matrix_scale( ctx->CurrentStack->Top, x, y, z);
 368    ctx->NewState |= ctx->CurrentStack->DirtyFlag;
 369 }
 370
 371
 372 /**
 373  * Multiply the current matrix with a translation matrix.
 374  *
 375  * \param x translation vector x coordinate.
 376  * \param y translation vector y coordinate.
 377  * \param z translation vector z coordinate.
 378  *
 379  * \sa glTranslatef().
 380  *
 381  * Flushes the vertices and calls _math_matrix_translate() with the top-most
 382  * matrix in the current stack and the given parameters. Marks
 383  * __struct gl_contextRec::NewState with the dirty stack flag.
 384  */
 385 void GLAPIENTRY
 386 _mesa_Translatef( GLfloat x, GLfloat y, GLfloat z )
 387 {
 388    GET_CURRENT_CONTEXT(ctx);
 389    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 390    _math_matrix_translate( ctx->CurrentStack->Top, x, y, z);
 391    ctx->NewState |= ctx->CurrentStack->DirtyFlag;
 392 }
 393
 394
 395 #if _HAVE_FULL_GL
 396 void GLAPIENTRY
 397 _mesa_LoadMatrixd( const GLdouble *m )
 398 {
 399    GLint i;
 400    GLfloat f[16];
 401    if (!m) return;
 402    for (i = 0; i < 16; i++)
 403       f[i] = (GLfloat) m[i];
 404    _mesa_LoadMatrixf(f);
 405 }
 406
 407 void GLAPIENTRY
 408 _mesa_MultMatrixd( const GLdouble *m )
 409 {
 410    GLint i;
 411    GLfloat f[16];
 412    if (!m) return;
 413    for (i = 0; i < 16; i++)
 414       f[i] = (GLfloat) m[i];
 415    _mesa_MultMatrixf( f );
 416 }
 417
 418
 419 void GLAPIENTRY
 420 _mesa_Rotated( GLdouble angle, GLdouble x, GLdouble y, GLdouble z )
 421 {
 422    _mesa_Rotatef((GLfloat) angle, (GLfloat) x, (GLfloat) y, (GLfloat) z);
 423 }
 424
 425
 426 void GLAPIENTRY
 427 _mesa_Scaled( GLdouble x, GLdouble y, GLdouble z )
 428 {
 429    _mesa_Scalef((GLfloat) x, (GLfloat) y, (GLfloat) z);
 430 }
 431
 432
 433 void GLAPIENTRY
 434 _mesa_Translated( GLdouble x, GLdouble y, GLdouble z )
 435 {
 436    _mesa_Translatef((GLfloat) x, (GLfloat) y, (GLfloat) z);
 437 }
 438 #endif
 439
 440
 441 #if _HAVE_FULL_GL
 442 void GLAPIENTRY
 443 _mesa_LoadTransposeMatrixfARB( const GLfloat *m )
 444 {
 445    GLfloat tm[16];
 446    if (!m) return;
 447    _math_transposef(tm, m);
 448    _mesa_LoadMatrixf(tm);
 449 }
 450
 451
 452 void GLAPIENTRY
 453 _mesa_LoadTransposeMatrixdARB( const GLdouble *m )
 454 {
 455    GLfloat tm[16];
 456    if (!m) return;
 457    _math_transposefd(tm, m);
 458    _mesa_LoadMatrixf(tm);
 459 }
 460
 461
 462 void GLAPIENTRY
 463 _mesa_MultTransposeMatrixfARB( const GLfloat *m )
 464 {
 465    GLfloat tm[16];
 466    if (!m) return;
 467    _math_transposef(tm, m);
 468    _mesa_MultMatrixf(tm);
 469 }
 470
 471
 472 void GLAPIENTRY
 473 _mesa_MultTransposeMatrixdARB( const GLdouble *m )
 474 {
 475    GLfloat tm[16];
 476    if (!m) return;
 477    _math_transposefd(tm, m);
 478    _mesa_MultMatrixf(tm);
 479 }
 480 #endif
 481
 482
 483
 484 /**********************************************************************/
 485 /** \name State management */
 486 /*@{*/
 487
 488
 489 /**
 490  * Update the projection matrix stack.
 491  *
 492  * \param ctx GL context.
 493  *
 494  * Calls _math_matrix_analyse() with the top-matrix of the projection matrix
 495  * stack, and recomputes user clip positions if necessary.
 496  *
 497  * \note This routine references __struct gl_contextRec::Tranform attribute
 498  * values to compute userclip positions in clip space, but is only called on
 499  * _NEW_PROJECTION.  The _mesa_ClipPlane() function keeps these values up to
 500  * date across changes to the __struct gl_contextRec::Transform attributes.
 501  */
 502 static void
 503 update_projection( struct gl_context *ctx )
 504 {
 505    _math_matrix_analyse( ctx->ProjectionMatrixStack.Top );
 506
 507 #if FEATURE_userclip
 508    /* Recompute clip plane positions in clipspace.  This is also done
 509     * in _mesa_ClipPlane().
 510     */
 511    if (ctx->Transform.ClipPlanesEnabled) {
 512       GLuint p;
 513       for (p = 0; p < ctx->Const.MaxClipPlanes; p++) {
 514          if (ctx->Transform.ClipPlanesEnabled & (1 << p)) {
 515             _mesa_transform_vector( ctx->Transform._ClipUserPlane[p],
 516                                  ctx->Transform.EyeUserPlane[p],
 517                                  ctx->ProjectionMatrixStack.Top->inv );
 518          }
 519       }
 520    }
 521 #endif
 522 }
 523
 524
 525 /**
 526  * Calculate the combined modelview-projection matrix.
 527  *
 528  * \param ctx GL context.
 529  *
 530  * Multiplies the top matrices of the projection and model view stacks into
 531  * __struct gl_contextRec::_ModelProjectMatrix via _math_matrix_mul_matrix()
 532  * and analyzes the resulting matrix via _math_matrix_analyse().
 533  */
 534 static void
 535 calculate_model_project_matrix( struct gl_context *ctx )
 536 {
 537    _math_matrix_mul_matrix( &ctx->_ModelProjectMatrix,
 538                             ctx->ProjectionMatrixStack.Top,
 539                             ctx->ModelviewMatrixStack.Top );
 540
 541    _math_matrix_analyse( &ctx->_ModelProjectMatrix );
 542 }
 543
 544
 545 /**
 546  * Updates the combined modelview-projection matrix.
 547  *
 548  * \param ctx GL context.
 549  * \param new_state new state bit mask.
 550  *
 551  * If there is a new model view matrix then analyzes it. If there is a new
 552  * projection matrix, updates it. Finally calls
 553  * calculate_model_project_matrix() to recalculate the modelview-projection
 554  * matrix.
 555  */
 556 void _mesa_update_modelview_project( struct gl_context *ctx, GLuint new_state )
 557 {
 558    if (new_state & _NEW_MODELVIEW) {
 559       _math_matrix_analyse( ctx->ModelviewMatrixStack.Top );
 560
 561       /* Bring cull position up to date.
 562        */
 563       TRANSFORM_POINT3( ctx->Transform.CullObjPos,
 564                         ctx->ModelviewMatrixStack.Top->inv,
 565                         ctx->Transform.CullEyePos );
 566    }
 567
 568
 569    if (new_state & _NEW_PROJECTION)
 570       update_projection( ctx );
 571
 572    /* Keep ModelviewProject up to date always to allow tnl
 573     * implementations that go model->clip even when eye is required.
 574     */
 575    calculate_model_project_matrix(ctx);
 576 }
 577
 578 /*@}*/
 579
 580
 581 /**********************************************************************/
 582 /** Matrix stack initialization */
 583 /*@{*/
 584
 585
 586 /**
 587  * Initialize a matrix stack.
 588  *
 589  * \param stack matrix stack.
 590  * \param maxDepth maximum stack depth.
 591  * \param dirtyFlag dirty flag.
 592  *
 593  * Allocates an array of \p maxDepth elements for the matrix stack and calls
 594  * _math_matrix_ctr() and _math_matrix_alloc_inv() for each element to
 595  * initialize it.
 596  */
 597 static void
 598 init_matrix_stack( struct gl_matrix_stack *stack,
 599                    GLuint maxDepth, GLuint dirtyFlag )
 600 {
 601    GLuint i;
 602
 603    stack->Depth = 0;
 604    stack->MaxDepth = maxDepth;
 605    stack->DirtyFlag = dirtyFlag;
 606    /* The stack */
 607    stack->Stack = (GLmatrix *) CALLOC(maxDepth * sizeof(GLmatrix));
 608    for (i = 0; i < maxDepth; i++) {
 609       _math_matrix_ctr(&stack->Stack[i]);
 610       _math_matrix_alloc_inv(&stack->Stack[i]);
 611    }
 612    stack->Top = stack->Stack;
 613 }
 614
 615 /**
 616  * Free matrix stack.
 617  *
 618  * \param stack matrix stack.
 619  *
 620  * Calls _math_matrix_dtr() for each element of the matrix stack and
 621  * frees the array.
 622  */
 623 static void
 624 free_matrix_stack( struct gl_matrix_stack *stack )
 625 {
 626    GLuint i;
 627    for (i = 0; i < stack->MaxDepth; i++) {
 628       _math_matrix_dtr(&stack->Stack[i]);
 629    }
 630    FREE(stack->Stack);
 631    stack->Stack = stack->Top = NULL;
 632 }
 633
 634 /*@}*/
 635
 636
 637 /**********************************************************************/
 638 /** \name Initialization */
 639 /*@{*/
 640
 641
 642 /**
 643  * Initialize the context matrix data.
 644  *
 645  * \param ctx GL context.
 646  *
 647  * Initializes each of the matrix stacks and the combined modelview-projection
 648  * matrix.
 649  */
 650 void _mesa_init_matrix( struct gl_context * ctx )
 651 {
 652    /* Initialize matrix stacks */
 653    init_matrix_stack(&ctx->ModelviewMatrixStack, MAX_MODELVIEW_STACK_DEPTH,
 654                      _NEW_MODELVIEW);
 655    init_matrix_stack(&ctx->ProjectionMatrixStack, MAX_PROJECTION_STACK_DEPTH,
 656                      _NEW_PROJECTION);
 657    init_matrix_stack(&ctx->TextureMatrixStack, MAX_TEXTURE_STACK_DEPTH,
 658                      _NEW_TEXTURE_MATRIX);
 659    ctx->CurrentStack = &ctx->ModelviewMatrixStack;
 660
 661    /* Init combined Modelview*Projection matrix */
 662    _math_matrix_ctr( &ctx->_ModelProjectMatrix );
 663 }
 664
 665
 666 /**
 667  * Free the context matrix data.
 668  *
 669  * \param ctx GL context.
 670  *
 671  * Frees each of the matrix stacks and the combined modelview-projection
 672  * matrix.
 673  */
 674 void _mesa_free_matrix_data( struct gl_context *ctx )
 675 {
 676    free_matrix_stack(&ctx->ModelviewMatrixStack);
 677    free_matrix_stack(&ctx->ProjectionMatrixStack);
 678    free_matrix_stack(&ctx->TextureMatrixStack);
 679    /* combined Modelview*Projection matrix */
 680    _math_matrix_dtr( &ctx->_ModelProjectMatrix );
 681
 682 }
 683
 684
 685 /**
 686  * Initialize the context transform attribute group.
 687  *
 688  * \param ctx GL context.
 689  *
 690  * \todo Move this to a new file with other 'transform' routines.
 691  */
 692 void _mesa_init_transform( struct gl_context *ctx )
 693 {
 694    GLint i;
 695
 696    /* Transformation group */
 697    ctx->Transform.MatrixMode = GL_MODELVIEW;
 698    ctx->Transform.Normalize = GL_FALSE;
 699    ctx->Transform.RescaleNormals = GL_FALSE;
 700    ctx->Transform.RasterPositionUnclipped = GL_FALSE;
 701    for (i=0;i<ctx->Const.MaxClipPlanes;i++) {
 702       ASSIGN_4V( ctx->Transform.EyeUserPlane[i], 0.0, 0.0, 0.0, 0.0 );
 703    }
 704    ctx->Transform.ClipPlanesEnabled = 0;
 705
 706    ASSIGN_4V( ctx->Transform.CullObjPos, 0.0, 0.0, 1.0, 0.0 );
 707    ASSIGN_4V( ctx->Transform.CullEyePos, 0.0, 0.0, 1.0, 0.0 );
 708 }
 709
 710
 711 /*@}*/