src/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
  38 #include "glheader.h"
  39 #include "imports.h"
  40 #include "context.h"
  41 #include "enums.h"
  42 #include "macros.h"
  43 #include "mfeatures.h"
  44 #include "matrix.h"
  45 #include "mtypes.h"
  46 #include "math/m_matrix.h"
  47
  48
  49 /**
  50  * Apply a perspective projection matrix.
  51  *
  52  * \param left left clipping plane coordinate.
  53  * \param right right clipping plane coordinate.
  54  * \param bottom bottom clipping plane coordinate.
  55  * \param top top clipping plane coordinate.
  56  * \param nearval distance to the near clipping plane.
  57  * \param farval distance to the far clipping plane.
  58  *
  59  * \sa glFrustum().
  60  *
  61  * Flushes vertices and validates parameters. Calls _math_matrix_frustum() with
  62  * the top matrix of the current matrix stack and sets
  63  * __struct gl_contextRec::NewState.
  64  */
  65 void GLAPIENTRY
  66 _mesa_Frustum( GLdouble left, GLdouble right,
  67                GLdouble bottom, GLdouble top,
  68                GLdouble nearval, GLdouble farval )
  69 {
  70    GET_CURRENT_CONTEXT(ctx);
  71    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
  72
  73    if (nearval <= 0.0 ||
  74        farval <= 0.0 ||
  75        nearval == farval ||
  76        left == right ||
  77        top == bottom)
  78    {
  79       _mesa_error( ctx,  GL_INVALID_VALUE, "glFrustum" );
  80       return;
  81    }
  82
  83    _math_matrix_frustum( ctx->CurrentStack->Top,
  84                          (GLfloat) left, (GLfloat) right,
  85                          (GLfloat) bottom, (GLfloat) top,
  86                          (GLfloat) nearval, (GLfloat) farval );
  87    ctx->NewState |= ctx->CurrentStack->DirtyFlag;
  88 }
  89
  90
  91 /**
  92  * Apply an orthographic projection matrix.
  93  *
  94  * \param left left clipping plane coordinate.
  95  * \param right right clipping plane coordinate.
  96  * \param bottom bottom clipping plane coordinate.
  97  * \param top top clipping plane coordinate.
  98  * \param nearval distance to the near clipping plane.
  99  * \param farval distance to the far clipping plane.
 100  *
 101  * \sa glOrtho().
 102  *
 103  * Flushes vertices and validates parameters. Calls _math_matrix_ortho() with
 104  * the top matrix of the current matrix stack and sets
 105  * __struct gl_contextRec::NewState.
 106  */
 107 void GLAPIENTRY
 108 _mesa_Ortho( GLdouble left, GLdouble right,
 109              GLdouble bottom, GLdouble top,
 110              GLdouble nearval, GLdouble farval )
 111 {
 112    GET_CURRENT_CONTEXT(ctx);
 113    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 114
 115    if (MESA_VERBOSE & VERBOSE_API)
 116       _mesa_debug(ctx, "glOrtho(%f, %f, %f, %f, %f, %f)\n",
 117                   left, right, bottom, top, nearval, farval);
 118
 119    if (left == right ||
 120        bottom == top ||
 121        nearval == farval)
 122    {
 123       _mesa_error( ctx,  GL_INVALID_VALUE, "glOrtho" );
 124       return;
 125    }
 126
 127    _math_matrix_ortho( ctx->CurrentStack->Top,
 128                        (GLfloat) left, (GLfloat) right,
 129                        (GLfloat) bottom, (GLfloat) top,
 130                        (GLfloat) nearval, (GLfloat) farval );
 131    ctx->NewState |= ctx->CurrentStack->DirtyFlag;
 132 }
 133
 134
 135 /**
 136  * Set the current matrix stack.
 137  *
 138  * \param mode matrix stack.
 139  *
 140  * \sa glMatrixMode().
 141  *
 142  * Flushes the vertices, validates the parameter and updates
 143  * __struct gl_contextRec::CurrentStack and gl_transform_attrib::MatrixMode
 144  * with the specified matrix stack.
 145  */
 146 void GLAPIENTRY
 147 _mesa_MatrixMode( GLenum mode )
 148 {
 149    GET_CURRENT_CONTEXT(ctx);
 150    ASSERT_OUTSIDE_BEGIN_END(ctx);
 151
 152    if (ctx->Transform.MatrixMode == mode && mode != GL_TEXTURE)
 153       return;
 154    FLUSH_VERTICES(ctx, _NEW_TRANSFORM);
 155
 156    switch (mode) {
 157    case GL_MODELVIEW:
 158       ctx->CurrentStack = &ctx->ModelviewMatrixStack;
 159       break;
 160    case GL_PROJECTION:
 161       ctx->CurrentStack = &ctx->ProjectionMatrixStack;
 162       break;
 163    case GL_TEXTURE:
 164       /* This error check is disabled because if we're called from
 165        * glPopAttrib() when the active texture unit is >= MaxTextureCoordUnits
 166        * we'll generate an unexpected error.
 167        * From the GL_ARB_vertex_shader spec it sounds like we should instead
 168        * do error checking in other places when we actually try to access
 169        * texture matrices beyond MaxTextureCoordUnits.
 170        */
 171 #if 0
 172       if (ctx->Texture.CurrentUnit >= ctx->Const.MaxTextureCoordUnits) {
 173          _mesa_error(ctx, GL_INVALID_OPERATION,
 174                      "glMatrixMode(invalid tex unit %d)",
 175                      ctx->Texture.CurrentUnit);
 176          return;
 177       }
 178 #endif
 179       ASSERT(ctx->Texture.CurrentUnit < Elements(ctx->TextureMatrixStack));
 180       ctx->CurrentStack = &ctx->TextureMatrixStack[ctx->Texture.CurrentUnit];
 181       break;
 182    case GL_MATRIX0_ARB:
 183    case GL_MATRIX1_ARB:
 184    case GL_MATRIX2_ARB:
 185    case GL_MATRIX3_ARB:
 186    case GL_MATRIX4_ARB:
 187    case GL_MATRIX5_ARB:
 188    case GL_MATRIX6_ARB:
 189    case GL_MATRIX7_ARB:
 190       if (ctx->API == API_OPENGL
 191           && (ctx->Extensions.ARB_vertex_program ||
 192               ctx->Extensions.ARB_fragment_program)) {
 193          const GLuint m = mode - GL_MATRIX0_ARB;
 194          if (m > ctx->Const.MaxProgramMatrices) {
 195             _mesa_error(ctx, GL_INVALID_ENUM,
 196                         "glMatrixMode(GL_MATRIX%d_ARB)", m);
 197             return;
 198          }
 199          ctx->CurrentStack = &ctx->ProgramMatrixStack[m];
 200       }
 201       else {
 202          _mesa_error( ctx,  GL_INVALID_ENUM, "glMatrixMode(mode)" );
 203          return;
 204       }
 205       break;
 206    default:
 207       _mesa_error( ctx,  GL_INVALID_ENUM, "glMatrixMode(mode)" );
 208       return;
 209    }
 210
 211    ctx->Transform.MatrixMode = mode;
 212 }
 213
 214
 215 /**
 216  * Push the current matrix stack.
 217  *
 218  * \sa glPushMatrix().
 219  *
 220  * Verifies the current matrix stack is not full, and duplicates the top-most
 221  * matrix in the stack.
 222  * Marks __struct gl_contextRec::NewState with the stack dirty flag.
 223  */
 224 void GLAPIENTRY
 225 _mesa_PushMatrix( void )
 226 {
 227    GET_CURRENT_CONTEXT(ctx);
 228    struct gl_matrix_stack *stack = ctx->CurrentStack;
 229    ASSERT_OUTSIDE_BEGIN_END(ctx);
 230
 231    if (MESA_VERBOSE&VERBOSE_API)
 232       _mesa_debug(ctx, "glPushMatrix %s\n",
 233                   _mesa_lookup_enum_by_nr(ctx->Transform.MatrixMode));
 234
 235    if (stack->Depth + 1 >= stack->MaxDepth) {
 236       if (ctx->Transform.MatrixMode == GL_TEXTURE) {
 237          _mesa_error(ctx,  GL_STACK_OVERFLOW,
 238                      "glPushMatrix(mode=GL_TEXTURE, unit=%d)",
 239                       ctx->Texture.CurrentUnit);
 240       }
 241       else {
 242          _mesa_error(ctx,  GL_STACK_OVERFLOW, "glPushMatrix(mode=%s)",
 243                      _mesa_lookup_enum_by_nr(ctx->Transform.MatrixMode));
 244       }
 245       return;
 246    }
 247    _math_matrix_copy( &stack->Stack[stack->Depth + 1],
 248                       &stack->Stack[stack->Depth] );
 249    stack->Depth++;
 250    stack->Top = &(stack->Stack[stack->Depth]);
 251    ctx->NewState |= stack->DirtyFlag;
 252 }
 253
 254
 255 /**
 256  * Pop the current matrix stack.
 257  *
 258  * \sa glPopMatrix().
 259  *
 260  * Flushes the vertices, verifies the current matrix stack is not empty, and
 261  * moves the stack head down.
 262  * Marks __struct gl_contextRec::NewState with the dirty stack flag.
 263  */
 264 void GLAPIENTRY
 265 _mesa_PopMatrix( void )
 266 {
 267    GET_CURRENT_CONTEXT(ctx);
 268    struct gl_matrix_stack *stack = ctx->CurrentStack;
 269    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 270
 271    if (MESA_VERBOSE&VERBOSE_API)
 272       _mesa_debug(ctx, "glPopMatrix %s\n",
 273                   _mesa_lookup_enum_by_nr(ctx->Transform.MatrixMode));
 274
 275    if (stack->Depth == 0) {
 276       if (ctx->Transform.MatrixMode == GL_TEXTURE) {
 277          _mesa_error(ctx,  GL_STACK_UNDERFLOW,
 278                      "glPopMatrix(mode=GL_TEXTURE, unit=%d)",
 279                       ctx->Texture.CurrentUnit);
 280       }
 281       else {
 282          _mesa_error(ctx,  GL_STACK_UNDERFLOW, "glPopMatrix(mode=%s)",
 283                      _mesa_lookup_enum_by_nr(ctx->Transform.MatrixMode));
 284       }
 285       return;
 286    }
 287    stack->Depth--;
 288    stack->Top = &(stack->Stack[stack->Depth]);
 289    ctx->NewState |= stack->DirtyFlag;
 290 }
 291
 292
 293 /**
 294  * Replace the current matrix with the identity matrix.
 295  *
 296  * \sa glLoadIdentity().
 297  *
 298  * Flushes the vertices and calls _math_matrix_set_identity() with the
 299  * top-most matrix in the current stack.
 300  * Marks __struct gl_contextRec::NewState with the stack dirty flag.
 301  */
 302 void GLAPIENTRY
 303 _mesa_LoadIdentity( void )
 304 {
 305    GET_CURRENT_CONTEXT(ctx);
 306    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 307
 308    if (MESA_VERBOSE & VERBOSE_API)
 309       _mesa_debug(ctx, "glLoadIdentity()\n");
 310
 311    _math_matrix_set_identity( ctx->CurrentStack->Top );
 312    ctx->NewState |= ctx->CurrentStack->DirtyFlag;
 313 }
 314
 315
 316 /**
 317  * Replace the current matrix with a given matrix.
 318  *
 319  * \param m matrix.
 320  *
 321  * \sa glLoadMatrixf().
 322  *
 323  * Flushes the vertices and calls _math_matrix_loadf() with the top-most
 324  * matrix in the current stack and the given matrix.
 325  * Marks __struct gl_contextRec::NewState with the dirty stack flag.
 326  */
 327 void GLAPIENTRY
 328 _mesa_LoadMatrixf( const GLfloat *m )
 329 {
 330    GET_CURRENT_CONTEXT(ctx);
 331    if (!m) return;
 332    if (MESA_VERBOSE & VERBOSE_API)
 333       _mesa_debug(ctx,
 334           "glLoadMatrix(%f %f %f %f, %f %f %f %f, %f %f %f %f, %f %f %f %f\n",
 335           m[0], m[4], m[8], m[12],
 336           m[1], m[5], m[9], m[13],
 337           m[2], m[6], m[10], m[14],
 338           m[3], m[7], m[11], m[15]);
 339
 340    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 341    _math_matrix_loadf( ctx->CurrentStack->Top, m );
 342    ctx->NewState |= ctx->CurrentStack->DirtyFlag;
 343 }
 344
 345
 346 /**
 347  * Multiply the current matrix with a given matrix.
 348  *
 349  * \param m matrix.
 350  *
 351  * \sa glMultMatrixf().
 352  *
 353  * Flushes the vertices and calls _math_matrix_mul_floats() with the top-most
 354  * matrix in the current stack and the given matrix. Marks
 355  * __struct gl_contextRec::NewState with the dirty stack flag.
 356  */
 357 void GLAPIENTRY
 358 _mesa_MultMatrixf( const GLfloat *m )
 359 {
 360    GET_CURRENT_CONTEXT(ctx);
 361    if (!m) return;
 362    if (MESA_VERBOSE & VERBOSE_API)
 363       _mesa_debug(ctx,
 364           "glMultMatrix(%f %f %f %f, %f %f %f %f, %f %f %f %f, %f %f %f %f\n",
 365           m[0], m[4], m[8], m[12],
 366           m[1], m[5], m[9], m[13],
 367           m[2], m[6], m[10], m[14],
 368           m[3], m[7], m[11], m[15]);
 369    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 370    _math_matrix_mul_floats( ctx->CurrentStack->Top, m );
 371    ctx->NewState |= ctx->CurrentStack->DirtyFlag;
 372 }
 373
 374
 375 /**
 376  * Multiply the current matrix with a rotation matrix.
 377  *
 378  * \param angle angle of rotation, in degrees.
 379  * \param x rotation vector x coordinate.
 380  * \param y rotation vector y coordinate.
 381  * \param z rotation vector z coordinate.
 382  *
 383  * \sa glRotatef().
 384  *
 385  * Flushes the vertices and calls _math_matrix_rotate() with the top-most
 386  * matrix in the current stack and the given parameters. Marks
 387  * __struct gl_contextRec::NewState with the dirty stack flag.
 388  */
 389 void GLAPIENTRY
 390 _mesa_Rotatef( GLfloat angle, GLfloat x, GLfloat y, GLfloat z )
 391 {
 392    GET_CURRENT_CONTEXT(ctx);
 393    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 394    if (angle != 0.0F) {
 395       _math_matrix_rotate( ctx->CurrentStack->Top, angle, x, y, z);
 396       ctx->NewState |= ctx->CurrentStack->DirtyFlag;
 397    }
 398 }
 399
 400
 401 /**
 402  * Multiply the current matrix with a general scaling matrix.
 403  *
 404  * \param x x axis scale factor.
 405  * \param y y axis scale factor.
 406  * \param z z axis scale factor.
 407  *
 408  * \sa glScalef().
 409  *
 410  * Flushes the vertices and calls _math_matrix_scale() with the top-most
 411  * matrix in the current stack and the given parameters. Marks
 412  * __struct gl_contextRec::NewState with the dirty stack flag.
 413  */
 414 void GLAPIENTRY
 415 _mesa_Scalef( GLfloat x, GLfloat y, GLfloat z )
 416 {
 417    GET_CURRENT_CONTEXT(ctx);
 418    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 419    _math_matrix_scale( ctx->CurrentStack->Top, x, y, z);
 420    ctx->NewState |= ctx->CurrentStack->DirtyFlag;
 421 }
 422
 423
 424 /**
 425  * Multiply the current matrix with a translation matrix.
 426  *
 427  * \param x translation vector x coordinate.
 428  * \param y translation vector y coordinate.
 429  * \param z translation vector z coordinate.
 430  *
 431  * \sa glTranslatef().
 432  *
 433  * Flushes the vertices and calls _math_matrix_translate() with the top-most
 434  * matrix in the current stack and the given parameters. Marks
 435  * __struct gl_contextRec::NewState with the dirty stack flag.
 436  */
 437 void GLAPIENTRY
 438 _mesa_Translatef( GLfloat x, GLfloat y, GLfloat z )
 439 {
 440    GET_CURRENT_CONTEXT(ctx);
 441    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 442    _math_matrix_translate( ctx->CurrentStack->Top, x, y, z);
 443    ctx->NewState |= ctx->CurrentStack->DirtyFlag;
 444 }
 445
 446
 447 #if _HAVE_FULL_GL
 448 void GLAPIENTRY
 449 _mesa_LoadMatrixd( const GLdouble *m )
 450 {
 451    GLint i;
 452    GLfloat f[16];
 453    if (!m) return;
 454    for (i = 0; i < 16; i++)
 455       f[i] = (GLfloat) m[i];
 456    _mesa_LoadMatrixf(f);
 457 }
 458
 459 void GLAPIENTRY
 460 _mesa_MultMatrixd( const GLdouble *m )
 461 {
 462    GLint i;
 463    GLfloat f[16];
 464    if (!m) return;
 465    for (i = 0; i < 16; i++)
 466       f[i] = (GLfloat) m[i];
 467    _mesa_MultMatrixf( f );
 468 }
 469
 470
 471 void GLAPIENTRY
 472 _mesa_Rotated( GLdouble angle, GLdouble x, GLdouble y, GLdouble z )
 473 {
 474    _mesa_Rotatef((GLfloat) angle, (GLfloat) x, (GLfloat) y, (GLfloat) z);
 475 }
 476
 477
 478 void GLAPIENTRY
 479 _mesa_Scaled( GLdouble x, GLdouble y, GLdouble z )
 480 {
 481    _mesa_Scalef((GLfloat) x, (GLfloat) y, (GLfloat) z);
 482 }
 483
 484
 485 void GLAPIENTRY
 486 _mesa_Translated( GLdouble x, GLdouble y, GLdouble z )
 487 {
 488    _mesa_Translatef((GLfloat) x, (GLfloat) y, (GLfloat) z);
 489 }
 490 #endif
 491
 492
 493 #if _HAVE_FULL_GL
 494 void GLAPIENTRY
 495 _mesa_LoadTransposeMatrixfARB( const GLfloat *m )
 496 {
 497    GLfloat tm[16];
 498    if (!m) return;
 499    _math_transposef(tm, m);
 500    _mesa_LoadMatrixf(tm);
 501 }
 502
 503
 504 void GLAPIENTRY
 505 _mesa_LoadTransposeMatrixdARB( const GLdouble *m )
 506 {
 507    GLfloat tm[16];
 508    if (!m) return;
 509    _math_transposefd(tm, m);
 510    _mesa_LoadMatrixf(tm);
 511 }
 512
 513
 514 void GLAPIENTRY
 515 _mesa_MultTransposeMatrixfARB( const GLfloat *m )
 516 {
 517    GLfloat tm[16];
 518    if (!m) return;
 519    _math_transposef(tm, m);
 520    _mesa_MultMatrixf(tm);
 521 }
 522
 523
 524 void GLAPIENTRY
 525 _mesa_MultTransposeMatrixdARB( const GLdouble *m )
 526 {
 527    GLfloat tm[16];
 528    if (!m) return;
 529    _math_transposefd(tm, m);
 530    _mesa_MultMatrixf(tm);
 531 }
 532 #endif
 533
 534
 535
 536 /**********************************************************************/
 537 /** \name State management */
 538 /*@{*/
 539
 540
 541 /**
 542  * Update the projection matrix stack.
 543  *
 544  * \param ctx GL context.
 545  *
 546  * Calls _math_matrix_analyse() with the top-matrix of the projection matrix
 547  * stack, and recomputes user clip positions if necessary.
 548  *
 549  * \note This routine references __struct gl_contextRec::Tranform attribute
 550  * values to compute userclip positions in clip space, but is only called on
 551  * _NEW_PROJECTION.  The _mesa_ClipPlane() function keeps these values up to
 552  * date across changes to the __struct gl_contextRec::Transform attributes.
 553  */
 554 static void
 555 update_projection( struct gl_context *ctx )
 556 {
 557    _math_matrix_analyse( ctx->ProjectionMatrixStack.Top );
 558
 559    /* Recompute clip plane positions in clipspace.  This is also done
 560     * in _mesa_ClipPlane().
 561     */
 562    if (ctx->Transform.ClipPlanesEnabled) {
 563       GLuint p;
 564       for (p = 0; p < ctx->Const.MaxClipPlanes; p++) {
 565          if (ctx->Transform.ClipPlanesEnabled & (1 << p)) {
 566             _mesa_transform_vector( ctx->Transform._ClipUserPlane[p],
 567                                  ctx->Transform.EyeUserPlane[p],
 568                                  ctx->ProjectionMatrixStack.Top->inv );
 569          }
 570       }
 571    }
 572 }
 573
 574
 575 /**
 576  * Calculate the combined modelview-projection matrix.
 577  *
 578  * \param ctx GL context.
 579  *
 580  * Multiplies the top matrices of the projection and model view stacks into
 581  * __struct gl_contextRec::_ModelProjectMatrix via _math_matrix_mul_matrix()
 582  * and analyzes the resulting matrix via _math_matrix_analyse().
 583  */
 584 static void
 585 calculate_model_project_matrix( struct gl_context *ctx )
 586 {
 587    _math_matrix_mul_matrix( &ctx->_ModelProjectMatrix,
 588                             ctx->ProjectionMatrixStack.Top,
 589                             ctx->ModelviewMatrixStack.Top );
 590
 591    _math_matrix_analyse( &ctx->_ModelProjectMatrix );
 592 }
 593
 594
 595 /**
 596  * Updates the combined modelview-projection matrix.
 597  *
 598  * \param ctx GL context.
 599  * \param new_state new state bit mask.
 600  *
 601  * If there is a new model view matrix then analyzes it. If there is a new
 602  * projection matrix, updates it. Finally calls
 603  * calculate_model_project_matrix() to recalculate the modelview-projection
 604  * matrix.
 605  */
 606 void _mesa_update_modelview_project( struct gl_context *ctx, GLuint new_state )
 607 {
 608    if (new_state & _NEW_MODELVIEW) {
 609       _math_matrix_analyse( ctx->ModelviewMatrixStack.Top );
 610
 611       /* Bring cull position up to date.
 612        */
 613       TRANSFORM_POINT3( ctx->Transform.CullObjPos,
 614                         ctx->ModelviewMatrixStack.Top->inv,
 615                         ctx->Transform.CullEyePos );
 616    }
 617
 618
 619    if (new_state & _NEW_PROJECTION)
 620       update_projection( ctx );
 621
 622    /* Keep ModelviewProject up to date always to allow tnl
 623     * implementations that go model->clip even when eye is required.
 624     */
 625    calculate_model_project_matrix(ctx);
 626 }
 627
 628 /*@}*/
 629
 630
 631 /**********************************************************************/
 632 /** Matrix stack initialization */
 633 /*@{*/
 634
 635
 636 /**
 637  * Initialize a matrix stack.
 638  *
 639  * \param stack matrix stack.
 640  * \param maxDepth maximum stack depth.
 641  * \param dirtyFlag dirty flag.
 642  *
 643  * Allocates an array of \p maxDepth elements for the matrix stack and calls
 644  * _math_matrix_ctr() for each element to initialize it.
 645  */
 646 static void
 647 init_matrix_stack( struct gl_matrix_stack *stack,
 648                    GLuint maxDepth, GLuint dirtyFlag )
 649 {
 650    GLuint i;
 651
 652    stack->Depth = 0;
 653    stack->MaxDepth = maxDepth;
 654    stack->DirtyFlag = dirtyFlag;
 655    /* The stack */
 656    stack->Stack = calloc(maxDepth, sizeof(GLmatrix));
 657    for (i = 0; i < maxDepth; i++) {
 658       _math_matrix_ctr(&stack->Stack[i]);
 659    }
 660    stack->Top = stack->Stack;
 661 }
 662
 663 /**
 664  * Free matrix stack.
 665  *
 666  * \param stack matrix stack.
 667  *
 668  * Calls _math_matrix_dtr() for each element of the matrix stack and
 669  * frees the array.
 670  */
 671 static void
 672 free_matrix_stack( struct gl_matrix_stack *stack )
 673 {
 674    GLuint i;
 675    for (i = 0; i < stack->MaxDepth; i++) {
 676       _math_matrix_dtr(&stack->Stack[i]);
 677    }
 678    free(stack->Stack);
 679    stack->Stack = stack->Top = NULL;
 680 }
 681
 682 /*@}*/
 683
 684
 685 /**********************************************************************/
 686 /** \name Initialization */
 687 /*@{*/
 688
 689
 690 /**
 691  * Initialize the context matrix data.
 692  *
 693  * \param ctx GL context.
 694  *
 695  * Initializes each of the matrix stacks and the combined modelview-projection
 696  * matrix.
 697  */
 698 void _mesa_init_matrix( struct gl_context * ctx )
 699 {
 700    GLint i;
 701
 702    /* Initialize matrix stacks */
 703    init_matrix_stack(&ctx->ModelviewMatrixStack, MAX_MODELVIEW_STACK_DEPTH,
 704                      _NEW_MODELVIEW);
 705    init_matrix_stack(&ctx->ProjectionMatrixStack, MAX_PROJECTION_STACK_DEPTH,
 706                      _NEW_PROJECTION);
 707    for (i = 0; i < Elements(ctx->TextureMatrixStack); i++)
 708       init_matrix_stack(&ctx->TextureMatrixStack[i], MAX_TEXTURE_STACK_DEPTH,
 709                         _NEW_TEXTURE_MATRIX);
 710    for (i = 0; i < Elements(ctx->ProgramMatrixStack); i++)
 711       init_matrix_stack(&ctx->ProgramMatrixStack[i],
 712                         MAX_PROGRAM_MATRIX_STACK_DEPTH, _NEW_TRACK_MATRIX);
 713    ctx->CurrentStack = &ctx->ModelviewMatrixStack;
 714
 715    /* Init combined Modelview*Projection matrix */
 716    _math_matrix_ctr( &ctx->_ModelProjectMatrix );
 717 }
 718
 719
 720 /**
 721  * Free the context matrix data.
 722  *
 723  * \param ctx GL context.
 724  *
 725  * Frees each of the matrix stacks and the combined modelview-projection
 726  * matrix.
 727  */
 728 void _mesa_free_matrix_data( struct gl_context *ctx )
 729 {
 730    GLint i;
 731
 732    free_matrix_stack(&ctx->ModelviewMatrixStack);
 733    free_matrix_stack(&ctx->ProjectionMatrixStack);
 734    for (i = 0; i < Elements(ctx->TextureMatrixStack); i++)
 735       free_matrix_stack(&ctx->TextureMatrixStack[i]);
 736    for (i = 0; i < Elements(ctx->ProgramMatrixStack); i++)
 737       free_matrix_stack(&ctx->ProgramMatrixStack[i]);
 738    /* combined Modelview*Projection matrix */
 739    _math_matrix_dtr( &ctx->_ModelProjectMatrix );
 740
 741 }
 742
 743
 744 /**
 745  * Initialize the context transform attribute group.
 746  *
 747  * \param ctx GL context.
 748  *
 749  * \todo Move this to a new file with other 'transform' routines.
 750  */
 751 void _mesa_init_transform( struct gl_context *ctx )
 752 {
 753    GLint i;
 754
 755    /* Transformation group */
 756    ctx->Transform.MatrixMode = GL_MODELVIEW;
 757    ctx->Transform.Normalize = GL_FALSE;
 758    ctx->Transform.RescaleNormals = GL_FALSE;
 759    ctx->Transform.RasterPositionUnclipped = GL_FALSE;
 760    for (i=0;i<ctx->Const.MaxClipPlanes;i++) {
 761       ASSIGN_4V( ctx->Transform.EyeUserPlane[i], 0.0, 0.0, 0.0, 0.0 );
 762    }
 763    ctx->Transform.ClipPlanesEnabled = 0;
 764
 765    ASSIGN_4V( ctx->Transform.CullObjPos, 0.0, 0.0, 1.0, 0.0 );
 766    ASSIGN_4V( ctx->Transform.CullEyePos, 0.0, 0.0, 1.0, 0.0 );
 767 }
 768
 769
 770 /*@}*/