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_NV:
 183    case GL_MATRIX1_NV:
 184    case GL_MATRIX2_NV:
 185    case GL_MATRIX3_NV:
 186    case GL_MATRIX4_NV:
 187    case GL_MATRIX5_NV:
 188    case GL_MATRIX6_NV:
 189    case GL_MATRIX7_NV:
 190       if (ctx->API == API_OPENGL && ctx->Extensions.NV_vertex_program) {
 191          ctx->CurrentStack = &ctx->ProgramMatrixStack[mode - GL_MATRIX0_NV];
 192       }
 193       else {
 194          _mesa_error( ctx,  GL_INVALID_ENUM, "glMatrixMode(mode)" );
 195          return;
 196       }
 197       break;
 198    case GL_MATRIX0_ARB:
 199    case GL_MATRIX1_ARB:
 200    case GL_MATRIX2_ARB:
 201    case GL_MATRIX3_ARB:
 202    case GL_MATRIX4_ARB:
 203    case GL_MATRIX5_ARB:
 204    case GL_MATRIX6_ARB:
 205    case GL_MATRIX7_ARB:
 206       if (ctx->API == API_OPENGL
 207           && (ctx->Extensions.ARB_vertex_program ||
 208               ctx->Extensions.ARB_fragment_program)) {
 209          const GLuint m = mode - GL_MATRIX0_ARB;
 210          if (m > ctx->Const.MaxProgramMatrices) {
 211             _mesa_error(ctx, GL_INVALID_ENUM,
 212                         "glMatrixMode(GL_MATRIX%d_ARB)", m);
 213             return;
 214          }
 215          ctx->CurrentStack = &ctx->ProgramMatrixStack[m];
 216       }
 217       else {
 218          _mesa_error( ctx,  GL_INVALID_ENUM, "glMatrixMode(mode)" );
 219          return;
 220       }
 221       break;
 222    default:
 223       _mesa_error( ctx,  GL_INVALID_ENUM, "glMatrixMode(mode)" );
 224       return;
 225    }
 226
 227    ctx->Transform.MatrixMode = mode;
 228 }
 229
 230
 231 /**
 232  * Push the current matrix stack.
 233  *
 234  * \sa glPushMatrix().
 235  *
 236  * Verifies the current matrix stack is not full, and duplicates the top-most
 237  * matrix in the stack.
 238  * Marks __struct gl_contextRec::NewState with the stack dirty flag.
 239  */
 240 void GLAPIENTRY
 241 _mesa_PushMatrix( void )
 242 {
 243    GET_CURRENT_CONTEXT(ctx);
 244    struct gl_matrix_stack *stack = ctx->CurrentStack;
 245    ASSERT_OUTSIDE_BEGIN_END(ctx);
 246
 247    if (MESA_VERBOSE&VERBOSE_API)
 248       _mesa_debug(ctx, "glPushMatrix %s\n",
 249                   _mesa_lookup_enum_by_nr(ctx->Transform.MatrixMode));
 250
 251    if (stack->Depth + 1 >= stack->MaxDepth) {
 252       if (ctx->Transform.MatrixMode == GL_TEXTURE) {
 253          _mesa_error(ctx,  GL_STACK_OVERFLOW,
 254                      "glPushMatrix(mode=GL_TEXTURE, unit=%d)",
 255                       ctx->Texture.CurrentUnit);
 256       }
 257       else {
 258          _mesa_error(ctx,  GL_STACK_OVERFLOW, "glPushMatrix(mode=%s)",
 259                      _mesa_lookup_enum_by_nr(ctx->Transform.MatrixMode));
 260       }
 261       return;
 262    }
 263    _math_matrix_copy( &stack->Stack[stack->Depth + 1],
 264                       &stack->Stack[stack->Depth] );
 265    stack->Depth++;
 266    stack->Top = &(stack->Stack[stack->Depth]);
 267    ctx->NewState |= stack->DirtyFlag;
 268 }
 269
 270
 271 /**
 272  * Pop the current matrix stack.
 273  *
 274  * \sa glPopMatrix().
 275  *
 276  * Flushes the vertices, verifies the current matrix stack is not empty, and
 277  * moves the stack head down.
 278  * Marks __struct gl_contextRec::NewState with the dirty stack flag.
 279  */
 280 void GLAPIENTRY
 281 _mesa_PopMatrix( void )
 282 {
 283    GET_CURRENT_CONTEXT(ctx);
 284    struct gl_matrix_stack *stack = ctx->CurrentStack;
 285    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 286
 287    if (MESA_VERBOSE&VERBOSE_API)
 288       _mesa_debug(ctx, "glPopMatrix %s\n",
 289                   _mesa_lookup_enum_by_nr(ctx->Transform.MatrixMode));
 290
 291    if (stack->Depth == 0) {
 292       if (ctx->Transform.MatrixMode == GL_TEXTURE) {
 293          _mesa_error(ctx,  GL_STACK_UNDERFLOW,
 294                      "glPopMatrix(mode=GL_TEXTURE, unit=%d)",
 295                       ctx->Texture.CurrentUnit);
 296       }
 297       else {
 298          _mesa_error(ctx,  GL_STACK_UNDERFLOW, "glPopMatrix(mode=%s)",
 299                      _mesa_lookup_enum_by_nr(ctx->Transform.MatrixMode));
 300       }
 301       return;
 302    }
 303    stack->Depth--;
 304    stack->Top = &(stack->Stack[stack->Depth]);
 305    ctx->NewState |= stack->DirtyFlag;
 306 }
 307
 308
 309 /**
 310  * Replace the current matrix with the identity matrix.
 311  *
 312  * \sa glLoadIdentity().
 313  *
 314  * Flushes the vertices and calls _math_matrix_set_identity() with the
 315  * top-most matrix in the current stack.
 316  * Marks __struct gl_contextRec::NewState with the stack dirty flag.
 317  */
 318 void GLAPIENTRY
 319 _mesa_LoadIdentity( void )
 320 {
 321    GET_CURRENT_CONTEXT(ctx);
 322    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 323
 324    if (MESA_VERBOSE & VERBOSE_API)
 325       _mesa_debug(ctx, "glLoadIdentity()\n");
 326
 327    _math_matrix_set_identity( ctx->CurrentStack->Top );
 328    ctx->NewState |= ctx->CurrentStack->DirtyFlag;
 329 }
 330
 331
 332 /**
 333  * Replace the current matrix with a given matrix.
 334  *
 335  * \param m matrix.
 336  *
 337  * \sa glLoadMatrixf().
 338  *
 339  * Flushes the vertices and calls _math_matrix_loadf() with the top-most
 340  * matrix in the current stack and the given matrix.
 341  * Marks __struct gl_contextRec::NewState with the dirty stack flag.
 342  */
 343 void GLAPIENTRY
 344 _mesa_LoadMatrixf( const GLfloat *m )
 345 {
 346    GET_CURRENT_CONTEXT(ctx);
 347    if (!m) return;
 348    if (MESA_VERBOSE & VERBOSE_API)
 349       _mesa_debug(ctx,
 350           "glLoadMatrix(%f %f %f %f, %f %f %f %f, %f %f %f %f, %f %f %f %f\n",
 351           m[0], m[4], m[8], m[12],
 352           m[1], m[5], m[9], m[13],
 353           m[2], m[6], m[10], m[14],
 354           m[3], m[7], m[11], m[15]);
 355
 356    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 357    _math_matrix_loadf( ctx->CurrentStack->Top, m );
 358    ctx->NewState |= ctx->CurrentStack->DirtyFlag;
 359 }
 360
 361
 362 /**
 363  * Multiply the current matrix with a given matrix.
 364  *
 365  * \param m matrix.
 366  *
 367  * \sa glMultMatrixf().
 368  *
 369  * Flushes the vertices and calls _math_matrix_mul_floats() with the top-most
 370  * matrix in the current stack and the given matrix. Marks
 371  * __struct gl_contextRec::NewState with the dirty stack flag.
 372  */
 373 void GLAPIENTRY
 374 _mesa_MultMatrixf( const GLfloat *m )
 375 {
 376    GET_CURRENT_CONTEXT(ctx);
 377    if (!m) return;
 378    if (MESA_VERBOSE & VERBOSE_API)
 379       _mesa_debug(ctx,
 380           "glMultMatrix(%f %f %f %f, %f %f %f %f, %f %f %f %f, %f %f %f %f\n",
 381           m[0], m[4], m[8], m[12],
 382           m[1], m[5], m[9], m[13],
 383           m[2], m[6], m[10], m[14],
 384           m[3], m[7], m[11], m[15]);
 385    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 386    _math_matrix_mul_floats( ctx->CurrentStack->Top, m );
 387    ctx->NewState |= ctx->CurrentStack->DirtyFlag;
 388 }
 389
 390
 391 /**
 392  * Multiply the current matrix with a rotation matrix.
 393  *
 394  * \param angle angle of rotation, in degrees.
 395  * \param x rotation vector x coordinate.
 396  * \param y rotation vector y coordinate.
 397  * \param z rotation vector z coordinate.
 398  *
 399  * \sa glRotatef().
 400  *
 401  * Flushes the vertices and calls _math_matrix_rotate() with the top-most
 402  * matrix in the current stack and the given parameters. Marks
 403  * __struct gl_contextRec::NewState with the dirty stack flag.
 404  */
 405 void GLAPIENTRY
 406 _mesa_Rotatef( GLfloat angle, GLfloat x, GLfloat y, GLfloat z )
 407 {
 408    GET_CURRENT_CONTEXT(ctx);
 409    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 410    if (angle != 0.0F) {
 411       _math_matrix_rotate( ctx->CurrentStack->Top, angle, x, y, z);
 412       ctx->NewState |= ctx->CurrentStack->DirtyFlag;
 413    }
 414 }
 415
 416
 417 /**
 418  * Multiply the current matrix with a general scaling matrix.
 419  *
 420  * \param x x axis scale factor.
 421  * \param y y axis scale factor.
 422  * \param z z axis scale factor.
 423  *
 424  * \sa glScalef().
 425  *
 426  * Flushes the vertices and calls _math_matrix_scale() with the top-most
 427  * matrix in the current stack and the given parameters. Marks
 428  * __struct gl_contextRec::NewState with the dirty stack flag.
 429  */
 430 void GLAPIENTRY
 431 _mesa_Scalef( GLfloat x, GLfloat y, GLfloat z )
 432 {
 433    GET_CURRENT_CONTEXT(ctx);
 434    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 435    _math_matrix_scale( ctx->CurrentStack->Top, x, y, z);
 436    ctx->NewState |= ctx->CurrentStack->DirtyFlag;
 437 }
 438
 439
 440 /**
 441  * Multiply the current matrix with a translation matrix.
 442  *
 443  * \param x translation vector x coordinate.
 444  * \param y translation vector y coordinate.
 445  * \param z translation vector z coordinate.
 446  *
 447  * \sa glTranslatef().
 448  *
 449  * Flushes the vertices and calls _math_matrix_translate() with the top-most
 450  * matrix in the current stack and the given parameters. Marks
 451  * __struct gl_contextRec::NewState with the dirty stack flag.
 452  */
 453 void GLAPIENTRY
 454 _mesa_Translatef( GLfloat x, GLfloat y, GLfloat z )
 455 {
 456    GET_CURRENT_CONTEXT(ctx);
 457    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 458    _math_matrix_translate( ctx->CurrentStack->Top, x, y, z);
 459    ctx->NewState |= ctx->CurrentStack->DirtyFlag;
 460 }
 461
 462
 463 #if _HAVE_FULL_GL
 464 void GLAPIENTRY
 465 _mesa_LoadMatrixd( const GLdouble *m )
 466 {
 467    GLint i;
 468    GLfloat f[16];
 469    if (!m) return;
 470    for (i = 0; i < 16; i++)
 471       f[i] = (GLfloat) m[i];
 472    _mesa_LoadMatrixf(f);
 473 }
 474
 475 void GLAPIENTRY
 476 _mesa_MultMatrixd( const GLdouble *m )
 477 {
 478    GLint i;
 479    GLfloat f[16];
 480    if (!m) return;
 481    for (i = 0; i < 16; i++)
 482       f[i] = (GLfloat) m[i];
 483    _mesa_MultMatrixf( f );
 484 }
 485
 486
 487 void GLAPIENTRY
 488 _mesa_Rotated( GLdouble angle, GLdouble x, GLdouble y, GLdouble z )
 489 {
 490    _mesa_Rotatef((GLfloat) angle, (GLfloat) x, (GLfloat) y, (GLfloat) z);
 491 }
 492
 493
 494 void GLAPIENTRY
 495 _mesa_Scaled( GLdouble x, GLdouble y, GLdouble z )
 496 {
 497    _mesa_Scalef((GLfloat) x, (GLfloat) y, (GLfloat) z);
 498 }
 499
 500
 501 void GLAPIENTRY
 502 _mesa_Translated( GLdouble x, GLdouble y, GLdouble z )
 503 {
 504    _mesa_Translatef((GLfloat) x, (GLfloat) y, (GLfloat) z);
 505 }
 506 #endif
 507
 508
 509 #if _HAVE_FULL_GL
 510 void GLAPIENTRY
 511 _mesa_LoadTransposeMatrixfARB( const GLfloat *m )
 512 {
 513    GLfloat tm[16];
 514    if (!m) return;
 515    _math_transposef(tm, m);
 516    _mesa_LoadMatrixf(tm);
 517 }
 518
 519
 520 void GLAPIENTRY
 521 _mesa_LoadTransposeMatrixdARB( const GLdouble *m )
 522 {
 523    GLfloat tm[16];
 524    if (!m) return;
 525    _math_transposefd(tm, m);
 526    _mesa_LoadMatrixf(tm);
 527 }
 528
 529
 530 void GLAPIENTRY
 531 _mesa_MultTransposeMatrixfARB( const GLfloat *m )
 532 {
 533    GLfloat tm[16];
 534    if (!m) return;
 535    _math_transposef(tm, m);
 536    _mesa_MultMatrixf(tm);
 537 }
 538
 539
 540 void GLAPIENTRY
 541 _mesa_MultTransposeMatrixdARB( const GLdouble *m )
 542 {
 543    GLfloat tm[16];
 544    if (!m) return;
 545    _math_transposefd(tm, m);
 546    _mesa_MultMatrixf(tm);
 547 }
 548 #endif
 549
 550
 551
 552 /**********************************************************************/
 553 /** \name State management */
 554 /*@{*/
 555
 556
 557 /**
 558  * Update the projection matrix stack.
 559  *
 560  * \param ctx GL context.
 561  *
 562  * Calls _math_matrix_analyse() with the top-matrix of the projection matrix
 563  * stack, and recomputes user clip positions if necessary.
 564  *
 565  * \note This routine references __struct gl_contextRec::Tranform attribute
 566  * values to compute userclip positions in clip space, but is only called on
 567  * _NEW_PROJECTION.  The _mesa_ClipPlane() function keeps these values up to
 568  * date across changes to the __struct gl_contextRec::Transform attributes.
 569  */
 570 static void
 571 update_projection( struct gl_context *ctx )
 572 {
 573    _math_matrix_analyse( ctx->ProjectionMatrixStack.Top );
 574
 575    /* Recompute clip plane positions in clipspace.  This is also done
 576     * in _mesa_ClipPlane().
 577     */
 578    if (ctx->Transform.ClipPlanesEnabled) {
 579       GLuint p;
 580       for (p = 0; p < ctx->Const.MaxClipPlanes; p++) {
 581          if (ctx->Transform.ClipPlanesEnabled & (1 << p)) {
 582             _mesa_transform_vector( ctx->Transform._ClipUserPlane[p],
 583                                  ctx->Transform.EyeUserPlane[p],
 584                                  ctx->ProjectionMatrixStack.Top->inv );
 585          }
 586       }
 587    }
 588 }
 589
 590
 591 /**
 592  * Calculate the combined modelview-projection matrix.
 593  *
 594  * \param ctx GL context.
 595  *
 596  * Multiplies the top matrices of the projection and model view stacks into
 597  * __struct gl_contextRec::_ModelProjectMatrix via _math_matrix_mul_matrix()
 598  * and analyzes the resulting matrix via _math_matrix_analyse().
 599  */
 600 static void
 601 calculate_model_project_matrix( struct gl_context *ctx )
 602 {
 603    _math_matrix_mul_matrix( &ctx->_ModelProjectMatrix,
 604                             ctx->ProjectionMatrixStack.Top,
 605                             ctx->ModelviewMatrixStack.Top );
 606
 607    _math_matrix_analyse( &ctx->_ModelProjectMatrix );
 608 }
 609
 610
 611 /**
 612  * Updates the combined modelview-projection matrix.
 613  *
 614  * \param ctx GL context.
 615  * \param new_state new state bit mask.
 616  *
 617  * If there is a new model view matrix then analyzes it. If there is a new
 618  * projection matrix, updates it. Finally calls
 619  * calculate_model_project_matrix() to recalculate the modelview-projection
 620  * matrix.
 621  */
 622 void _mesa_update_modelview_project( struct gl_context *ctx, GLuint new_state )
 623 {
 624    if (new_state & _NEW_MODELVIEW) {
 625       _math_matrix_analyse( ctx->ModelviewMatrixStack.Top );
 626
 627       /* Bring cull position up to date.
 628        */
 629       TRANSFORM_POINT3( ctx->Transform.CullObjPos,
 630                         ctx->ModelviewMatrixStack.Top->inv,
 631                         ctx->Transform.CullEyePos );
 632    }
 633
 634
 635    if (new_state & _NEW_PROJECTION)
 636       update_projection( ctx );
 637
 638    /* Keep ModelviewProject up to date always to allow tnl
 639     * implementations that go model->clip even when eye is required.
 640     */
 641    calculate_model_project_matrix(ctx);
 642 }
 643
 644 /*@}*/
 645
 646
 647 /**********************************************************************/
 648 /** Matrix stack initialization */
 649 /*@{*/
 650
 651
 652 /**
 653  * Initialize a matrix stack.
 654  *
 655  * \param stack matrix stack.
 656  * \param maxDepth maximum stack depth.
 657  * \param dirtyFlag dirty flag.
 658  *
 659  * Allocates an array of \p maxDepth elements for the matrix stack and calls
 660  * _math_matrix_ctr() for each element to initialize it.
 661  */
 662 static void
 663 init_matrix_stack( struct gl_matrix_stack *stack,
 664                    GLuint maxDepth, GLuint dirtyFlag )
 665 {
 666    GLuint i;
 667
 668    stack->Depth = 0;
 669    stack->MaxDepth = maxDepth;
 670    stack->DirtyFlag = dirtyFlag;
 671    /* The stack */
 672    stack->Stack = calloc(maxDepth, sizeof(GLmatrix));
 673    for (i = 0; i < maxDepth; i++) {
 674       _math_matrix_ctr(&stack->Stack[i]);
 675    }
 676    stack->Top = stack->Stack;
 677 }
 678
 679 /**
 680  * Free matrix stack.
 681  *
 682  * \param stack matrix stack.
 683  *
 684  * Calls _math_matrix_dtr() for each element of the matrix stack and
 685  * frees the array.
 686  */
 687 static void
 688 free_matrix_stack( struct gl_matrix_stack *stack )
 689 {
 690    GLuint i;
 691    for (i = 0; i < stack->MaxDepth; i++) {
 692       _math_matrix_dtr(&stack->Stack[i]);
 693    }
 694    free(stack->Stack);
 695    stack->Stack = stack->Top = NULL;
 696 }
 697
 698 /*@}*/
 699
 700
 701 /**********************************************************************/
 702 /** \name Initialization */
 703 /*@{*/
 704
 705
 706 /**
 707  * Initialize the context matrix data.
 708  *
 709  * \param ctx GL context.
 710  *
 711  * Initializes each of the matrix stacks and the combined modelview-projection
 712  * matrix.
 713  */
 714 void _mesa_init_matrix( struct gl_context * ctx )
 715 {
 716    GLint i;
 717
 718    /* Initialize matrix stacks */
 719    init_matrix_stack(&ctx->ModelviewMatrixStack, MAX_MODELVIEW_STACK_DEPTH,
 720                      _NEW_MODELVIEW);
 721    init_matrix_stack(&ctx->ProjectionMatrixStack, MAX_PROJECTION_STACK_DEPTH,
 722                      _NEW_PROJECTION);
 723    for (i = 0; i < Elements(ctx->TextureMatrixStack); i++)
 724       init_matrix_stack(&ctx->TextureMatrixStack[i], MAX_TEXTURE_STACK_DEPTH,
 725                         _NEW_TEXTURE_MATRIX);
 726    for (i = 0; i < Elements(ctx->ProgramMatrixStack); i++)
 727       init_matrix_stack(&ctx->ProgramMatrixStack[i],
 728                         MAX_PROGRAM_MATRIX_STACK_DEPTH, _NEW_TRACK_MATRIX);
 729    ctx->CurrentStack = &ctx->ModelviewMatrixStack;
 730
 731    /* Init combined Modelview*Projection matrix */
 732    _math_matrix_ctr( &ctx->_ModelProjectMatrix );
 733 }
 734
 735
 736 /**
 737  * Free the context matrix data.
 738  *
 739  * \param ctx GL context.
 740  *
 741  * Frees each of the matrix stacks and the combined modelview-projection
 742  * matrix.
 743  */
 744 void _mesa_free_matrix_data( struct gl_context *ctx )
 745 {
 746    GLint i;
 747
 748    free_matrix_stack(&ctx->ModelviewMatrixStack);
 749    free_matrix_stack(&ctx->ProjectionMatrixStack);
 750    for (i = 0; i < Elements(ctx->TextureMatrixStack); i++)
 751       free_matrix_stack(&ctx->TextureMatrixStack[i]);
 752    for (i = 0; i < Elements(ctx->ProgramMatrixStack); i++)
 753       free_matrix_stack(&ctx->ProgramMatrixStack[i]);
 754    /* combined Modelview*Projection matrix */
 755    _math_matrix_dtr( &ctx->_ModelProjectMatrix );
 756
 757 }
 758
 759
 760 /**
 761  * Initialize the context transform attribute group.
 762  *
 763  * \param ctx GL context.
 764  *
 765  * \todo Move this to a new file with other 'transform' routines.
 766  */
 767 void _mesa_init_transform( struct gl_context *ctx )
 768 {
 769    GLint i;
 770
 771    /* Transformation group */
 772    ctx->Transform.MatrixMode = GL_MODELVIEW;
 773    ctx->Transform.Normalize = GL_FALSE;
 774    ctx->Transform.RescaleNormals = GL_FALSE;
 775    ctx->Transform.RasterPositionUnclipped = GL_FALSE;
 776    for (i=0;i<ctx->Const.MaxClipPlanes;i++) {
 777       ASSIGN_4V( ctx->Transform.EyeUserPlane[i], 0.0, 0.0, 0.0, 0.0 );
 778    }
 779    ctx->Transform.ClipPlanesEnabled = 0;
 780
 781    ASSIGN_4V( ctx->Transform.CullObjPos, 0.0, 0.0, 1.0, 0.0 );
 782    ASSIGN_4V( ctx->Transform.CullEyePos, 0.0, 0.0, 1.0, 0.0 );
 783 }
 784
 785
 786 /*@}*/