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 "matrix.h"
  44 #include "mtypes.h"
  45 #include "math/m_matrix.h"
  46
  47
  48 /**
  49  * Apply a perspective projection matrix.
  50  *
  51  * \param left left clipping plane coordinate.
  52  * \param right right clipping plane coordinate.
  53  * \param bottom bottom clipping plane coordinate.
  54  * \param top top clipping plane coordinate.
  55  * \param nearval distance to the near clipping plane.
  56  * \param farval distance to the far clipping plane.
  57  *
  58  * \sa glFrustum().
  59  *
  60  * Flushes vertices and validates parameters. Calls _math_matrix_frustum() with
  61  * the top matrix of the current matrix stack and sets
  62  * __GLcontextRec::NewState.
  63  */
  64 void GLAPIENTRY
  65 _mesa_Frustum( GLdouble left, GLdouble right,
  66                GLdouble bottom, GLdouble top,
  67                GLdouble nearval, GLdouble farval )
  68 {
  69    GET_CURRENT_CONTEXT(ctx);
  70    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
  71
  72    if (nearval <= 0.0 ||
  73        farval <= 0.0 ||
  74        nearval == farval ||
  75        left == right ||
  76        top == bottom)
  77    {
  78       _mesa_error( ctx,  GL_INVALID_VALUE, "glFrustum" );
  79       return;
  80    }
  81
  82    _math_matrix_frustum( ctx->CurrentStack->Top,
  83                          (GLfloat) left, (GLfloat) right,
  84                          (GLfloat) bottom, (GLfloat) top,
  85                          (GLfloat) nearval, (GLfloat) farval );
  86    ctx->NewState |= ctx->CurrentStack->DirtyFlag;
  87 }
  88
  89
  90 /**
  91  * Apply an orthographic projection matrix.
  92  *
  93  * \param left left clipping plane coordinate.
  94  * \param right right clipping plane coordinate.
  95  * \param bottom bottom clipping plane coordinate.
  96  * \param top top clipping plane coordinate.
  97  * \param nearval distance to the near clipping plane.
  98  * \param farval distance to the far clipping plane.
  99  *
 100  * \sa glOrtho().
 101  *
 102  * Flushes vertices and validates parameters. Calls _math_matrix_ortho() with
 103  * the top matrix of the current matrix stack and sets
 104  * __GLcontextRec::NewState.
 105  */
 106 void GLAPIENTRY
 107 _mesa_Ortho( GLdouble left, GLdouble right,
 108              GLdouble bottom, GLdouble top,
 109              GLdouble nearval, GLdouble farval )
 110 {
 111    GET_CURRENT_CONTEXT(ctx);
 112    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 113
 114    if (MESA_VERBOSE & VERBOSE_API)
 115       _mesa_debug(ctx, "glOrtho(%f, %f, %f, %f, %f, %f)\n",
 116                   left, right, bottom, top, nearval, farval);
 117
 118    if (left == right ||
 119        bottom == top ||
 120        nearval == farval)
 121    {
 122       _mesa_error( ctx,  GL_INVALID_VALUE, "glOrtho" );
 123       return;
 124    }
 125
 126    _math_matrix_ortho( ctx->CurrentStack->Top,
 127                        (GLfloat) left, (GLfloat) right,
 128                        (GLfloat) bottom, (GLfloat) top,
 129                        (GLfloat) nearval, (GLfloat) farval );
 130    ctx->NewState |= ctx->CurrentStack->DirtyFlag;
 131 }
 132
 133
 134 /**
 135  * Set the current matrix stack.
 136  *
 137  * \param mode matrix stack.
 138  *
 139  * \sa glMatrixMode().
 140  *
 141  * Flushes the vertices, validates the parameter and updates
 142  * __GLcontextRec::CurrentStack and gl_transform_attrib::MatrixMode with the
 143  * specified matrix stack.
 144  */
 145 void GLAPIENTRY
 146 _mesa_MatrixMode( GLenum mode )
 147 {
 148    GET_CURRENT_CONTEXT(ctx);
 149    ASSERT_OUTSIDE_BEGIN_END(ctx);
 150
 151    if (ctx->Transform.MatrixMode == mode && mode != GL_TEXTURE)
 152       return;
 153    FLUSH_VERTICES(ctx, _NEW_TRANSFORM);
 154
 155    switch (mode) {
 156    case GL_MODELVIEW:
 157       ctx->CurrentStack = &ctx->ModelviewMatrixStack;
 158       break;
 159    case GL_PROJECTION:
 160       ctx->CurrentStack = &ctx->ProjectionMatrixStack;
 161       break;
 162    case GL_TEXTURE:
 163       /* This error check is disabled because if we're called from
 164        * glPopAttrib() when the active texture unit is >= MaxTextureCoordUnits
 165        * we'll generate an unexpected error.
 166        * From the GL_ARB_vertex_shader spec it sounds like we should instead
 167        * do error checking in other places when we actually try to access
 168        * texture matrices beyond MaxTextureCoordUnits.
 169        */
 170 #if 0
 171       if (ctx->Texture.CurrentUnit >= ctx->Const.MaxTextureCoordUnits) {
 172          _mesa_error(ctx, GL_INVALID_OPERATION, "glMatrixMode(invalid tex unit %d)",
 173                      ctx->Texture.CurrentUnit);
 174          return;
 175       }
 176 #endif
 177       ASSERT(ctx->Texture.CurrentUnit < Elements(ctx->TextureMatrixStack));
 178       ctx->CurrentStack = &ctx->TextureMatrixStack[ctx->Texture.CurrentUnit];
 179       break;
 180    case GL_COLOR:
 181       ctx->CurrentStack = &ctx->ColorMatrixStack;
 182       break;
 183    case GL_MATRIX0_NV:
 184    case GL_MATRIX1_NV:
 185    case GL_MATRIX2_NV:
 186    case GL_MATRIX3_NV:
 187    case GL_MATRIX4_NV:
 188    case GL_MATRIX5_NV:
 189    case GL_MATRIX6_NV:
 190    case GL_MATRIX7_NV:
 191       if (ctx->Extensions.NV_vertex_program) {
 192          ctx->CurrentStack = &ctx->ProgramMatrixStack[mode - GL_MATRIX0_NV];
 193       }
 194       else {
 195          _mesa_error( ctx,  GL_INVALID_ENUM, "glMatrixMode(mode)" );
 196          return;
 197       }
 198       break;
 199    case GL_MATRIX0_ARB:
 200    case GL_MATRIX1_ARB:
 201    case GL_MATRIX2_ARB:
 202    case GL_MATRIX3_ARB:
 203    case GL_MATRIX4_ARB:
 204    case GL_MATRIX5_ARB:
 205    case GL_MATRIX6_ARB:
 206    case GL_MATRIX7_ARB:
 207       if (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. Marks __GLcontextRec::NewState with the stack dirty
 238  * 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. Marks __GLcontextRec::NewState with the dirty
 278  * 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 top-most
 315  * matrix in the current stack. Marks __GLcontextRec::NewState with the stack
 316  * 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()");
 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 matrix
 340  * in the current stack and the given matrix. Marks __GLcontextRec::NewState
 341  * 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  * __GLcontextRec::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  * __GLcontextRec::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  * __GLcontextRec::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  * __GLcontextRec::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 __GLcontextRec::Tranform attribute values to
 566  * 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 __GLcontextRec::Transform attributes.
 569  */
 570 static void
 571 update_projection( GLcontext *ctx )
 572 {
 573    _math_matrix_analyse( ctx->ProjectionMatrixStack.Top );
 574
 575 #if FEATURE_userclip
 576    /* Recompute clip plane positions in clipspace.  This is also done
 577     * in _mesa_ClipPlane().
 578     */
 579    if (ctx->Transform.ClipPlanesEnabled) {
 580       GLuint p;
 581       for (p = 0; p < ctx->Const.MaxClipPlanes; p++) {
 582          if (ctx->Transform.ClipPlanesEnabled & (1 << p)) {
 583             _mesa_transform_vector( ctx->Transform._ClipUserPlane[p],
 584                                  ctx->Transform.EyeUserPlane[p],
 585                                  ctx->ProjectionMatrixStack.Top->inv );
 586          }
 587       }
 588    }
 589 #endif
 590 }
 591
 592
 593 /**
 594  * Calculate the combined modelview-projection matrix.
 595  *
 596  * \param ctx GL context.
 597  *
 598  * Multiplies the top matrices of the projection and model view stacks into
 599  * __GLcontextRec::_ModelProjectMatrix via _math_matrix_mul_matrix() and
 600  * analyzes the resulting matrix via _math_matrix_analyse().
 601  */
 602 static void
 603 calculate_model_project_matrix( GLcontext *ctx )
 604 {
 605    _math_matrix_mul_matrix( &ctx->_ModelProjectMatrix,
 606                             ctx->ProjectionMatrixStack.Top,
 607                             ctx->ModelviewMatrixStack.Top );
 608
 609    _math_matrix_analyse( &ctx->_ModelProjectMatrix );
 610 }
 611
 612
 613 /**
 614  * Updates the combined modelview-projection matrix.
 615  *
 616  * \param ctx GL context.
 617  * \param new_state new state bit mask.
 618  *
 619  * If there is a new model view matrix then analyzes it. If there is a new
 620  * projection matrix, updates it. Finally calls
 621  * calculate_model_project_matrix() to recalculate the modelview-projection
 622  * matrix.
 623  */
 624 void _mesa_update_modelview_project( GLcontext *ctx, GLuint new_state )
 625 {
 626    if (new_state & _NEW_MODELVIEW) {
 627       _math_matrix_analyse( ctx->ModelviewMatrixStack.Top );
 628
 629       /* Bring cull position uptodate.
 630        */
 631       TRANSFORM_POINT3( ctx->Transform.CullObjPos,
 632                         ctx->ModelviewMatrixStack.Top->inv,
 633                         ctx->Transform.CullEyePos );
 634    }
 635
 636
 637    if (new_state & _NEW_PROJECTION)
 638       update_projection( ctx );
 639
 640    /* Keep ModelviewProject uptodate always to allow tnl
 641     * implementations that go model->clip even when eye is required.
 642     */
 643    calculate_model_project_matrix(ctx);
 644 }
 645
 646 /*@}*/
 647
 648
 649 /**********************************************************************/
 650 /** Matrix stack initialization */
 651 /*@{*/
 652
 653
 654 /**
 655  * Initialize a matrix stack.
 656  *
 657  * \param stack matrix stack.
 658  * \param maxDepth maximum stack depth.
 659  * \param dirtyFlag dirty flag.
 660  *
 661  * Allocates an array of \p maxDepth elements for the matrix stack and calls
 662  * _math_matrix_ctr() and _math_matrix_alloc_inv() for each element to
 663  * initialize it.
 664  */
 665 static void
 666 init_matrix_stack( struct gl_matrix_stack *stack,
 667                    GLuint maxDepth, GLuint dirtyFlag )
 668 {
 669    GLuint i;
 670
 671    stack->Depth = 0;
 672    stack->MaxDepth = maxDepth;
 673    stack->DirtyFlag = dirtyFlag;
 674    /* The stack */
 675    stack->Stack = (GLmatrix *) CALLOC(maxDepth * sizeof(GLmatrix));
 676    for (i = 0; i < maxDepth; i++) {
 677       _math_matrix_ctr(&stack->Stack[i]);
 678       _math_matrix_alloc_inv(&stack->Stack[i]);
 679    }
 680    stack->Top = stack->Stack;
 681 }
 682
 683 /**
 684  * Free matrix stack.
 685  *
 686  * \param stack matrix stack.
 687  *
 688  * Calls _math_matrix_dtr() for each element of the matrix stack and
 689  * frees the array.
 690  */
 691 static void
 692 free_matrix_stack( struct gl_matrix_stack *stack )
 693 {
 694    GLuint i;
 695    for (i = 0; i < stack->MaxDepth; i++) {
 696       _math_matrix_dtr(&stack->Stack[i]);
 697    }
 698    FREE(stack->Stack);
 699    stack->Stack = stack->Top = NULL;
 700 }
 701
 702 /*@}*/
 703
 704
 705 /**********************************************************************/
 706 /** \name Initialization */
 707 /*@{*/
 708
 709
 710 /**
 711  * Initialize the context matrix data.
 712  *
 713  * \param ctx GL context.
 714  *
 715  * Initializes each of the matrix stacks and the combined modelview-projection
 716  * matrix.
 717  */
 718 void _mesa_init_matrix( GLcontext * ctx )
 719 {
 720    GLint i;
 721
 722    /* Initialize matrix stacks */
 723    init_matrix_stack(&ctx->ModelviewMatrixStack, MAX_MODELVIEW_STACK_DEPTH,
 724                      _NEW_MODELVIEW);
 725    init_matrix_stack(&ctx->ProjectionMatrixStack, MAX_PROJECTION_STACK_DEPTH,
 726                      _NEW_PROJECTION);
 727    init_matrix_stack(&ctx->ColorMatrixStack, MAX_COLOR_STACK_DEPTH,
 728                      _NEW_COLOR_MATRIX);
 729    for (i = 0; i < Elements(ctx->TextureMatrixStack); i++)
 730       init_matrix_stack(&ctx->TextureMatrixStack[i], MAX_TEXTURE_STACK_DEPTH,
 731                         _NEW_TEXTURE_MATRIX);
 732    for (i = 0; i < Elements(ctx->ProgramMatrixStack); i++)
 733       init_matrix_stack(&ctx->ProgramMatrixStack[i],
 734                         MAX_PROGRAM_MATRIX_STACK_DEPTH, _NEW_TRACK_MATRIX);
 735    ctx->CurrentStack = &ctx->ModelviewMatrixStack;
 736
 737    /* Init combined Modelview*Projection matrix */
 738    _math_matrix_ctr( &ctx->_ModelProjectMatrix );
 739 }
 740
 741
 742 /**
 743  * Free the context matrix data.
 744  *
 745  * \param ctx GL context.
 746  *
 747  * Frees each of the matrix stacks and the combined modelview-projection
 748  * matrix.
 749  */
 750 void _mesa_free_matrix_data( GLcontext *ctx )
 751 {
 752    GLint i;
 753
 754    free_matrix_stack(&ctx->ModelviewMatrixStack);
 755    free_matrix_stack(&ctx->ProjectionMatrixStack);
 756    free_matrix_stack(&ctx->ColorMatrixStack);
 757    for (i = 0; i < Elements(ctx->TextureMatrixStack); i++)
 758       free_matrix_stack(&ctx->TextureMatrixStack[i]);
 759    for (i = 0; i < Elements(ctx->ProgramMatrixStack); i++)
 760       free_matrix_stack(&ctx->ProgramMatrixStack[i]);
 761    /* combined Modelview*Projection matrix */
 762    _math_matrix_dtr( &ctx->_ModelProjectMatrix );
 763
 764 }
 765
 766
 767 /**
 768  * Initialize the context transform attribute group.
 769  *
 770  * \param ctx GL context.
 771  *
 772  * \todo Move this to a new file with other 'transform' routines.
 773  */
 774 void _mesa_init_transform( GLcontext *ctx )
 775 {
 776    GLint i;
 777
 778    /* Transformation group */
 779    ctx->Transform.MatrixMode = GL_MODELVIEW;
 780    ctx->Transform.Normalize = GL_FALSE;
 781    ctx->Transform.RescaleNormals = GL_FALSE;
 782    ctx->Transform.RasterPositionUnclipped = GL_FALSE;
 783    for (i=0;i<MAX_CLIP_PLANES;i++) {
 784       ASSIGN_4V( ctx->Transform.EyeUserPlane[i], 0.0, 0.0, 0.0, 0.0 );
 785    }
 786    ctx->Transform.ClipPlanesEnabled = 0;
 787
 788    ASSIGN_4V( ctx->Transform.CullObjPos, 0.0, 0.0, 1.0, 0.0 );
 789    ASSIGN_4V( ctx->Transform.CullEyePos, 0.0, 0.0, 1.0, 0.0 );
 790 }
 791
 792
 793 /*@}*/