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 #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 * __struct gl_contextRec::_ModelProjectMatrix via _math_matrix_mul_matrix() 600 * and analyzes the resulting matrix via _math_matrix_analyse(). 601 */ 602 static void 603 calculate_model_project_matrix( struct gl_context *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( struct gl_context *ctx, GLuint new_state ) 625 { 626 if (new_state & _NEW_MODELVIEW) { 627 _math_matrix_analyse( ctx->ModelviewMatrixStack.Top ); 628 629 /* Bring cull position up to date. 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 up to date 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() for each element to initialize it. 663 */ 664 static void 665 init_matrix_stack( struct gl_matrix_stack *stack, 666 GLuint maxDepth, GLuint dirtyFlag ) 667 { 668 GLuint i; 669 670 stack->Depth = 0; 671 stack->MaxDepth = maxDepth; 672 stack->DirtyFlag = dirtyFlag; 673 /* The stack */ 674 stack->Stack = (GLmatrix *) CALLOC(maxDepth * sizeof(GLmatrix)); 675 for (i = 0; i < maxDepth; i++) { 676 _math_matrix_ctr(&stack->Stack[i]); 677 } 678 stack->Top = stack->Stack; 679 } 680 681 /** 682 * Free matrix stack. 683 * 684 * \param stack matrix stack. 685 * 686 * Calls _math_matrix_dtr() for each element of the matrix stack and 687 * frees the array. 688 */ 689 static void 690 free_matrix_stack( struct gl_matrix_stack *stack ) 691 { 692 GLuint i; 693 for (i = 0; i < stack->MaxDepth; i++) { 694 _math_matrix_dtr(&stack->Stack[i]); 695 } 696 FREE(stack->Stack); 697 stack->Stack = stack->Top = NULL; 698 } 699 700 /*@}*/ 701 702 703 /**********************************************************************/ 704 /** \name Initialization */ 705 /*@{*/ 706 707 708 /** 709 * Initialize the context matrix data. 710 * 711 * \param ctx GL context. 712 * 713 * Initializes each of the matrix stacks and the combined modelview-projection 714 * matrix. 715 */ 716 void _mesa_init_matrix( struct gl_context * ctx ) 717 { 718 GLint i; 719 720 /* Initialize matrix stacks */ 721 init_matrix_stack(&ctx->ModelviewMatrixStack, MAX_MODELVIEW_STACK_DEPTH, 722 _NEW_MODELVIEW); 723 init_matrix_stack(&ctx->ProjectionMatrixStack, MAX_PROJECTION_STACK_DEPTH, 724 _NEW_PROJECTION); 725 for (i = 0; i < Elements(ctx->TextureMatrixStack); i++) 726 init_matrix_stack(&ctx->TextureMatrixStack[i], MAX_TEXTURE_STACK_DEPTH, 727 _NEW_TEXTURE_MATRIX); 728 for (i = 0; i < Elements(ctx->ProgramMatrixStack); i++) 729 init_matrix_stack(&ctx->ProgramMatrixStack[i], 730 MAX_PROGRAM_MATRIX_STACK_DEPTH, _NEW_TRACK_MATRIX); 731 ctx->CurrentStack = &ctx->ModelviewMatrixStack; 732 733 /* Init combined Modelview*Projection matrix */ 734 _math_matrix_ctr( &ctx->_ModelProjectMatrix ); 735 } 736 737 738 /** 739 * Free the context matrix data. 740 * 741 * \param ctx GL context. 742 * 743 * Frees each of the matrix stacks and the combined modelview-projection 744 * matrix. 745 */ 746 void _mesa_free_matrix_data( struct gl_context *ctx ) 747 { 748 GLint i; 749 750 free_matrix_stack(&ctx->ModelviewMatrixStack); 751 free_matrix_stack(&ctx->ProjectionMatrixStack); 752 for (i = 0; i < Elements(ctx->TextureMatrixStack); i++) 753 free_matrix_stack(&ctx->TextureMatrixStack[i]); 754 for (i = 0; i < Elements(ctx->ProgramMatrixStack); i++) 755 free_matrix_stack(&ctx->ProgramMatrixStack[i]); 756 /* combined Modelview*Projection matrix */ 757 _math_matrix_dtr( &ctx->_ModelProjectMatrix ); 758 759 } 760 761 762 /** 763 * Initialize the context transform attribute group. 764 * 765 * \param ctx GL context. 766 * 767 * \todo Move this to a new file with other 'transform' routines. 768 */ 769 void _mesa_init_transform( struct gl_context *ctx ) 770 { 771 GLint i; 772 773 /* Transformation group */ 774 ctx->Transform.MatrixMode = GL_MODELVIEW; 775 ctx->Transform.Normalize = GL_FALSE; 776 ctx->Transform.RescaleNormals = GL_FALSE; 777 ctx->Transform.RasterPositionUnclipped = GL_FALSE; 778 for (i=0;i<ctx->Const.MaxClipPlanes;i++) { 779 ASSIGN_4V( ctx->Transform.EyeUserPlane[i], 0.0, 0.0, 0.0, 0.0 ); 780 } 781 ctx->Transform.ClipPlanesEnabled = 0; 782 783 ASSIGN_4V( ctx->Transform.CullObjPos, 0.0, 0.0, 1.0, 0.0 ); 784 ASSIGN_4V( ctx->Transform.CullEyePos, 0.0, 0.0, 1.0, 0.0 ); 785 } 786 787 788 /*@}*/ 789
