src/mesa/main/matrix.c

   1 /**
   2  * \file matrix.c
   3  * Matrix operations.
   4  *
   5  * \note
   6  * -# 4x4 transformation matrices are stored in memory in column major order.
   7  * -# Points/vertices are to be thought of as column vectors.
   8  * -# Transformation of a point p by a matrix M is: p' = M * p
   9  */
  10
  11 /*
  12  * Mesa 3-D graphics library
  13  * Version:  6.1
  14  *
  15  * Copyright (C) 1999-2004  Brian Paul   All Rights Reserved.
  16  *
  17  * Permission is hereby granted, free of charge, to any person obtaining a
  18  * copy of this software and associated documentation files (the "Software"),
  19  * to deal in the Software without restriction, including without limitation
  20  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  21  * and/or sell copies of the Software, and to permit persons to whom the
  22  * Software is furnished to do so, subject to the following conditions:
  23  *
  24  * The above copyright notice and this permission notice shall be included
  25  * in all copies or substantial portions of the Software.
  26  *
  27  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  28  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  29  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  30  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  31  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  32  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  33  */
  34
  35
  36 #include "glheader.h"
  37 #include "imports.h"
  38 #include "buffers.h"
  39 #include "context.h"
  40 #include "enums.h"
  41 #include "macros.h"
  42 #include "matrix.h"
  43 #include "mtypes.h"
  44 #include "math/m_matrix.h"
  45 #include "math/m_xform.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, "glFrustum(%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       ctx->CurrentStack = &ctx->TextureMatrixStack[ctx->Texture.CurrentUnit];
 164       break;
 165    case GL_COLOR:
 166       ctx->CurrentStack = &ctx->ColorMatrixStack;
 167       break;
 168    case GL_MATRIX0_NV:
 169    case GL_MATRIX1_NV:
 170    case GL_MATRIX2_NV:
 171    case GL_MATRIX3_NV:
 172    case GL_MATRIX4_NV:
 173    case GL_MATRIX5_NV:
 174    case GL_MATRIX6_NV:
 175    case GL_MATRIX7_NV:
 176       if (ctx->Extensions.NV_vertex_program) {
 177          ctx->CurrentStack = &ctx->ProgramMatrixStack[mode - GL_MATRIX0_NV];
 178       }
 179       else {
 180          _mesa_error( ctx,  GL_INVALID_ENUM, "glMatrixMode(mode)" );
 181          return;
 182       }
 183       break;
 184    case GL_MATRIX0_ARB:
 185    case GL_MATRIX1_ARB:
 186    case GL_MATRIX2_ARB:
 187    case GL_MATRIX3_ARB:
 188    case GL_MATRIX4_ARB:
 189    case GL_MATRIX5_ARB:
 190    case GL_MATRIX6_ARB:
 191    case GL_MATRIX7_ARB:
 192       if (ctx->Extensions.ARB_vertex_program ||
 193           ctx->Extensions.ARB_fragment_program) {
 194          const GLuint m = mode - GL_MATRIX0_ARB;
 195          if (m > ctx->Const.MaxProgramMatrices) {
 196             _mesa_error(ctx, GL_INVALID_ENUM,
 197                         "glMatrixMode(GL_MATRIX%d_ARB)", m);
 198             return;
 199          }
 200          ctx->CurrentStack = &ctx->ProgramMatrixStack[m];
 201       }
 202       else {
 203          _mesa_error( ctx,  GL_INVALID_ENUM, "glMatrixMode(mode)" );
 204          return;
 205       }
 206       break;
 207    default:
 208       _mesa_error( ctx,  GL_INVALID_ENUM, "glMatrixMode(mode)" );
 209       return;
 210    }
 211
 212    ctx->Transform.MatrixMode = mode;
 213 }
 214
 215
 216 /**
 217  * Push the current matrix stack.
 218  *
 219  * \sa glPushMatrix().
 220  *
 221  * Verifies the current matrix stack is not full, and duplicates the top-most
 222  * matrix in the stack. Marks __GLcontextRec::NewState with the stack dirty
 223  * flag.
 224  */
 225 void GLAPIENTRY
 226 _mesa_PushMatrix( void )
 227 {
 228    GET_CURRENT_CONTEXT(ctx);
 229    struct matrix_stack *stack = ctx->CurrentStack;
 230    ASSERT_OUTSIDE_BEGIN_END(ctx);
 231
 232    if (MESA_VERBOSE&VERBOSE_API)
 233       _mesa_debug(ctx, "glPushMatrix %s\n",
 234                   _mesa_lookup_enum_by_nr(ctx->Transform.MatrixMode));
 235
 236    if (stack->Depth + 1 >= stack->MaxDepth) {
 237       if (ctx->Transform.MatrixMode == GL_TEXTURE) {
 238          _mesa_error(ctx,  GL_STACK_OVERFLOW,
 239                      "glPushMatrix(mode=GL_TEXTURE, unit=%d)",
 240                       ctx->Texture.CurrentUnit);
 241       }
 242       else {
 243          _mesa_error(ctx,  GL_STACK_OVERFLOW, "glPushMatrix(mode=%s)",
 244                      _mesa_lookup_enum_by_nr(ctx->Transform.MatrixMode));
 245       }
 246       return;
 247    }
 248    _math_matrix_copy( &stack->Stack[stack->Depth + 1],
 249                       &stack->Stack[stack->Depth] );
 250    stack->Depth++;
 251    stack->Top = &(stack->Stack[stack->Depth]);
 252    ctx->NewState |= stack->DirtyFlag;
 253 }
 254
 255
 256 /**
 257  * Pop the current matrix stack.
 258  *
 259  * \sa glPopMatrix().
 260  *
 261  * Flushes the vertices, verifies the current matrix stack is not empty, and
 262  * moves the stack head down. Marks __GLcontextRec::NewState with the dirty
 263  * stack flag.
 264  */
 265 void GLAPIENTRY
 266 _mesa_PopMatrix( void )
 267 {
 268    GET_CURRENT_CONTEXT(ctx);
 269    struct matrix_stack *stack = ctx->CurrentStack;
 270    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 271
 272    if (MESA_VERBOSE&VERBOSE_API)
 273       _mesa_debug(ctx, "glPopMatrix %s\n",
 274                   _mesa_lookup_enum_by_nr(ctx->Transform.MatrixMode));
 275
 276    if (stack->Depth == 0) {
 277       if (ctx->Transform.MatrixMode == GL_TEXTURE) {
 278          _mesa_error(ctx,  GL_STACK_UNDERFLOW,
 279                      "glPopMatrix(mode=GL_TEXTURE, unit=%d)",
 280                       ctx->Texture.CurrentUnit);
 281       }
 282       else {
 283          _mesa_error(ctx,  GL_STACK_UNDERFLOW, "glPopMatrix(mode=%s)",
 284                      _mesa_lookup_enum_by_nr(ctx->Transform.MatrixMode));
 285       }
 286       return;
 287    }
 288    stack->Depth--;
 289    stack->Top = &(stack->Stack[stack->Depth]);
 290    ctx->NewState |= stack->DirtyFlag;
 291 }
 292
 293
 294 /**
 295  * Replace the current matrix with the identity matrix.
 296  *
 297  * \sa glLoadIdentity().
 298  *
 299  * Flushes the vertices and calls _math_matrix_set_identity() with the top-most
 300  * matrix in the current stack. Marks __GLcontextRec::NewState with the stack
 301  * dirty flag.
 302  */
 303 void GLAPIENTRY
 304 _mesa_LoadIdentity( void )
 305 {
 306    GET_CURRENT_CONTEXT(ctx);
 307    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 308
 309    if (MESA_VERBOSE & VERBOSE_API)
 310       _mesa_debug(ctx, "glLoadIdentity()");
 311
 312    _math_matrix_set_identity( ctx->CurrentStack->Top );
 313    ctx->NewState |= ctx->CurrentStack->DirtyFlag;
 314 }
 315
 316
 317 /**
 318  * Replace the current matrix with a given matrix.
 319  *
 320  * \param m matrix.
 321  *
 322  * \sa glLoadMatrixf().
 323  *
 324  * Flushes the vertices and calls _math_matrix_loadf() with the top-most matrix
 325  * in the current stack and the given matrix. Marks __GLcontextRec::NewState
 326  * with the dirty stack flag.
 327  */
 328 void GLAPIENTRY
 329 _mesa_LoadMatrixf( const GLfloat *m )
 330 {
 331    GET_CURRENT_CONTEXT(ctx);
 332    if (!m) return;
 333    if (MESA_VERBOSE & VERBOSE_API)
 334       _mesa_debug(ctx,
 335           "glLoadMatrix(%f %f %f %f, %f %f %f %f, %f %f %f %f, %f %f %f %f\n",
 336           m[0], m[4], m[8], m[12],
 337           m[1], m[5], m[9], m[13],
 338           m[2], m[6], m[10], m[14],
 339           m[3], m[7], m[11], m[15]);
 340
 341    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 342    _math_matrix_loadf( ctx->CurrentStack->Top, m );
 343    ctx->NewState |= ctx->CurrentStack->DirtyFlag;
 344 }
 345
 346
 347 /**
 348  * Multiply the current matrix with a given matrix.
 349  *
 350  * \param m matrix.
 351  *
 352  * \sa glMultMatrixf().
 353  *
 354  * Flushes the vertices and calls _math_matrix_mul_floats() with the top-most
 355  * matrix in the current stack and the given matrix. Marks
 356  * __GLcontextRec::NewState with the dirty stack flag.
 357  */
 358 void GLAPIENTRY
 359 _mesa_MultMatrixf( const GLfloat *m )
 360 {
 361    GET_CURRENT_CONTEXT(ctx);
 362    if (!m) return;
 363    if (MESA_VERBOSE & VERBOSE_API)
 364       _mesa_debug(ctx,
 365           "glMultMatrix(%f %f %f %f, %f %f %f %f, %f %f %f %f, %f %f %f %f\n",
 366           m[0], m[4], m[8], m[12],
 367           m[1], m[5], m[9], m[13],
 368           m[2], m[6], m[10], m[14],
 369           m[3], m[7], m[11], m[15]);
 370    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 371    _math_matrix_mul_floats( ctx->CurrentStack->Top, m );
 372    ctx->NewState |= ctx->CurrentStack->DirtyFlag;
 373 }
 374
 375
 376 /**
 377  * Multiply the current matrix with a rotation matrix.
 378  *
 379  * \param angle angle of rotation, in degrees.
 380  * \param x rotation vector x coordinate.
 381  * \param y rotation vector y coordinate.
 382  * \param z rotation vector z coordinate.
 383  *
 384  * \sa glRotatef().
 385  *
 386  * Flushes the vertices and calls _math_matrix_rotate() with the top-most
 387  * matrix in the current stack and the given parameters. Marks
 388  * __GLcontextRec::NewState with the dirty stack flag.
 389  */
 390 void GLAPIENTRY
 391 _mesa_Rotatef( GLfloat angle, GLfloat x, GLfloat y, GLfloat z )
 392 {
 393    GET_CURRENT_CONTEXT(ctx);
 394    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 395    if (angle != 0.0F) {
 396       _math_matrix_rotate( ctx->CurrentStack->Top, angle, x, y, z);
 397       ctx->NewState |= ctx->CurrentStack->DirtyFlag;
 398    }
 399 }
 400
 401
 402 /**
 403  * Multiply the current matrix with a general scaling matrix.
 404  *
 405  * \param x x axis scale factor.
 406  * \param y y axis scale factor.
 407  * \param z z axis scale factor.
 408  *
 409  * \sa glScalef().
 410  *
 411  * Flushes the vertices and calls _math_matrix_scale() with the top-most
 412  * matrix in the current stack and the given parameters. Marks
 413  * __GLcontextRec::NewState with the dirty stack flag.
 414  */
 415 void GLAPIENTRY
 416 _mesa_Scalef( GLfloat x, GLfloat y, GLfloat z )
 417 {
 418    GET_CURRENT_CONTEXT(ctx);
 419    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 420    _math_matrix_scale( ctx->CurrentStack->Top, x, y, z);
 421    ctx->NewState |= ctx->CurrentStack->DirtyFlag;
 422 }
 423
 424
 425 /**
 426  * Multiply the current matrix with a general scaling matrix.
 427  *
 428  * \param x translation vector x coordinate.
 429  * \param y translation vector y coordinate.
 430  * \param z translation vector z coordinate.
 431  *
 432  * \sa glTranslatef().
 433  *
 434  * Flushes the vertices and calls _math_matrix_translate() with the top-most
 435  * matrix in the current stack and the given parameters. Marks
 436  * __GLcontextRec::NewState with the dirty stack flag.
 437  */
 438 void GLAPIENTRY
 439 _mesa_Translatef( GLfloat x, GLfloat y, GLfloat z )
 440 {
 441    GET_CURRENT_CONTEXT(ctx);
 442    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 443    _math_matrix_translate( ctx->CurrentStack->Top, x, y, z);
 444    ctx->NewState |= ctx->CurrentStack->DirtyFlag;
 445 }
 446
 447
 448 #if _HAVE_FULL_GL
 449 void GLAPIENTRY
 450 _mesa_LoadMatrixd( const GLdouble *m )
 451 {
 452    GLint i;
 453    GLfloat f[16];
 454    if (!m) return;
 455    for (i = 0; i < 16; i++)
 456       f[i] = (GLfloat) m[i];
 457    _mesa_LoadMatrixf(f);
 458 }
 459
 460 void GLAPIENTRY
 461 _mesa_MultMatrixd( const GLdouble *m )
 462 {
 463    GLint i;
 464    GLfloat f[16];
 465    if (!m) return;
 466    for (i = 0; i < 16; i++)
 467       f[i] = (GLfloat) m[i];
 468    _mesa_MultMatrixf( f );
 469 }
 470
 471
 472 void GLAPIENTRY
 473 _mesa_Rotated( GLdouble angle, GLdouble x, GLdouble y, GLdouble z )
 474 {
 475    _mesa_Rotatef((GLfloat) angle, (GLfloat) x, (GLfloat) y, (GLfloat) z);
 476 }
 477
 478
 479 void GLAPIENTRY
 480 _mesa_Scaled( GLdouble x, GLdouble y, GLdouble z )
 481 {
 482    _mesa_Scalef((GLfloat) x, (GLfloat) y, (GLfloat) z);
 483 }
 484
 485
 486 void GLAPIENTRY
 487 _mesa_Translated( GLdouble x, GLdouble y, GLdouble z )
 488 {
 489    _mesa_Translatef((GLfloat) x, (GLfloat) y, (GLfloat) z);
 490 }
 491 #endif
 492
 493
 494 #if _HAVE_FULL_GL
 495 void GLAPIENTRY
 496 _mesa_LoadTransposeMatrixfARB( const GLfloat *m )
 497 {
 498    GLfloat tm[16];
 499    if (!m) return;
 500    _math_transposef(tm, m);
 501    _mesa_LoadMatrixf(tm);
 502 }
 503
 504
 505 void GLAPIENTRY
 506 _mesa_LoadTransposeMatrixdARB( const GLdouble *m )
 507 {
 508    GLfloat tm[16];
 509    if (!m) return;
 510    _math_transposefd(tm, m);
 511    _mesa_LoadMatrixf(tm);
 512 }
 513
 514
 515 void GLAPIENTRY
 516 _mesa_MultTransposeMatrixfARB( const GLfloat *m )
 517 {
 518    GLfloat tm[16];
 519    if (!m) return;
 520    _math_transposef(tm, m);
 521    _mesa_MultMatrixf(tm);
 522 }
 523
 524
 525 void GLAPIENTRY
 526 _mesa_MultTransposeMatrixdARB( const GLdouble *m )
 527 {
 528    GLfloat tm[16];
 529    if (!m) return;
 530    _math_transposefd(tm, m);
 531    _mesa_MultMatrixf(tm);
 532 }
 533 #endif
 534
 535 /**
 536  * Set the viewport.
 537  *
 538  * \param x, y coordinates of the lower-left corner of the viewport rectangle.
 539  * \param width width of the viewport rectangle.
 540  * \param height height of the viewport rectangle.
 541  *
 542  * \sa Called via glViewport() or display list execution.
 543  *
 544  * Flushes the vertices and calls _mesa_set_viewport() with the given
 545  * parameters.
 546  */
 547 void GLAPIENTRY
 548 _mesa_Viewport( GLint x, GLint y, GLsizei width, GLsizei height )
 549 {
 550    GET_CURRENT_CONTEXT(ctx);
 551    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 552    _mesa_set_viewport(ctx, x, y, width, height);
 553 }
 554
 555 /**
 556  * Set new viewport parameters and update derived state (the _WindowMap
 557  * matrix).  Usually called from _mesa_Viewport().
 558  *
 559  * \note  We also call _mesa_ResizeBuffersMESA() because this is a good
 560  * time to check if the window has been resized.  Many device drivers
 561  * can't get direct notification from the window system of size changes
 562  * so this is an ad-hoc solution to that problem.
 563  *
 564  * \param ctx GL context.
 565  * \param x, y coordinates of the lower left corner of the viewport rectangle.
 566  * \param width width of the viewport rectangle.
 567  * \param height height of the viewport rectangle.
 568  *
 569  * Verifies the parameters, clamps them to the implementation dependent range
 570  * and updates __GLcontextRec::Viewport. Computes the scale and bias values for
 571  * the drivers and notifies the driver via the dd_function_table::Viewport
 572  * callback.
 573  */
 574 void
 575 _mesa_set_viewport( GLcontext *ctx, GLint x, GLint y,
 576                     GLsizei width, GLsizei height )
 577 {
 578    const GLfloat n = ctx->Viewport.Near;
 579    const GLfloat f = ctx->Viewport.Far;
 580
 581    if (MESA_VERBOSE & VERBOSE_API)
 582       _mesa_debug(ctx, "glViewport %d %d %d %d\n", x, y, width, height);
 583
 584    if (width < 0 || height < 0) {
 585       _mesa_error( ctx,  GL_INVALID_VALUE,
 586                    "glViewport(%d, %d, %d, %d)", x, y, width, height );
 587       return;
 588    }
 589
 590    /* clamp width, and height to implementation dependent range */
 591    width  = CLAMP( width,  1, MAX_WIDTH );
 592    height = CLAMP( height, 1, MAX_HEIGHT );
 593
 594    /* Save viewport */
 595    ctx->Viewport.X = x;
 596    ctx->Viewport.Width = width;
 597    ctx->Viewport.Y = y;
 598    ctx->Viewport.Height = height;
 599
 600    /* XXX send transposed width/height to Driver.Viewport() below??? */
 601    if (ctx->_RotateMode) {
 602       GLint tmp, tmps;
 603       tmp = x; x = y; y = tmp;
 604       tmps = width; width = height; height = tmps;
 605    }
 606
 607    /* compute scale and bias values :: This is really driver-specific
 608     * and should be maintained elsewhere if at all.  NOTE: RasterPos
 609     * uses this.
 610     */
 611    ctx->Viewport._WindowMap.m[MAT_SX] = (GLfloat) width / 2.0F;
 612    ctx->Viewport._WindowMap.m[MAT_TX] = ctx->Viewport._WindowMap.m[MAT_SX] + x;
 613    ctx->Viewport._WindowMap.m[MAT_SY] = (GLfloat) height / 2.0F;
 614    ctx->Viewport._WindowMap.m[MAT_TY] = ctx->Viewport._WindowMap.m[MAT_SY] + y;
 615    ctx->Viewport._WindowMap.m[MAT_SZ] = ctx->DepthMaxF * ((f - n) / 2.0F);
 616    ctx->Viewport._WindowMap.m[MAT_TZ] = ctx->DepthMaxF * ((f - n) / 2.0F + n);
 617    ctx->Viewport._WindowMap.flags = MAT_FLAG_GENERAL_SCALE|MAT_FLAG_TRANSLATION;
 618    ctx->Viewport._WindowMap.type = MATRIX_3D_NO_ROT;
 619    ctx->NewState |= _NEW_VIEWPORT;
 620
 621    /* Check if window/buffer has been resized and if so, reallocate the
 622     * ancillary buffers.  This is an ad-hoc solution to detecting window
 623     * size changes.  99% of all GL apps call glViewport when a window is
 624     * resized so this is a good time to check for new window dims and
 625     * reallocate color buffers and ancilliary buffers.
 626     */
 627    _mesa_ResizeBuffersMESA();
 628
 629    if (ctx->Driver.Viewport) {
 630       (*ctx->Driver.Viewport)( ctx, x, y, width, height );
 631    }
 632 }
 633
 634
 635 #if _HAVE_FULL_GL
 636 void GLAPIENTRY
 637 _mesa_DepthRange( GLclampd nearval, GLclampd farval )
 638 {
 639    /*
 640     * nearval - specifies mapping of the near clipping plane to window
 641     *   coordinates, default is 0
 642     * farval - specifies mapping of the far clipping plane to window
 643     *   coordinates, default is 1
 644     *
 645     * After clipping and div by w, z coords are in -1.0 to 1.0,
 646     * corresponding to near and far clipping planes.  glDepthRange
 647     * specifies a linear mapping of the normalized z coords in
 648     * this range to window z coords.
 649     */
 650    GLfloat n, f;
 651    GET_CURRENT_CONTEXT(ctx);
 652    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 653
 654    if (MESA_VERBOSE&VERBOSE_API)
 655       _mesa_debug(ctx, "glDepthRange %f %f\n", nearval, farval);
 656
 657    n = (GLfloat) CLAMP( nearval, 0.0, 1.0 );
 658    f = (GLfloat) CLAMP( farval, 0.0, 1.0 );
 659
 660    ctx->Viewport.Near = n;
 661    ctx->Viewport.Far = f;
 662    ctx->Viewport._WindowMap.m[MAT_SZ] = ctx->DepthMaxF * ((f - n) / 2.0F);
 663    ctx->Viewport._WindowMap.m[MAT_TZ] = ctx->DepthMaxF * ((f - n) / 2.0F + n);
 664    ctx->NewState |= _NEW_VIEWPORT;
 665
 666    if (ctx->Driver.DepthRange) {
 667       (*ctx->Driver.DepthRange)( ctx, nearval, farval );
 668    }
 669 }
 670 #endif
 671
 672
 673
 674 /**********************************************************************/
 675 /** \name State management */
 676 /*@{*/
 677
 678
 679 /**
 680  * Update the projection matrix stack.
 681  *
 682  * \param ctx GL context.
 683  *
 684  * Calls _math_matrix_analyse() with the top-matrix of the projection matrix
 685  * stack, and recomputes user clip positions if necessary.
 686  *
 687  * \note This routine references __GLcontextRec::Tranform attribute values to
 688  * compute userclip positions in clip space, but is only called on
 689  * _NEW_PROJECTION.  The _mesa_ClipPlane() function keeps these values up to
 690  * date across changes to the __GLcontextRec::Transform attributes.
 691  */
 692 static void
 693 update_projection( GLcontext *ctx )
 694 {
 695    _math_matrix_analyse( ctx->ProjectionMatrixStack.Top );
 696
 697 #if FEATURE_userclip
 698    /* Recompute clip plane positions in clipspace.  This is also done
 699     * in _mesa_ClipPlane().
 700     */
 701    if (ctx->Transform.ClipPlanesEnabled) {
 702       GLuint p;
 703       for (p = 0; p < ctx->Const.MaxClipPlanes; p++) {
 704          if (ctx->Transform.ClipPlanesEnabled & (1 << p)) {
 705             _mesa_transform_vector( ctx->Transform._ClipUserPlane[p],
 706                                  ctx->Transform.EyeUserPlane[p],
 707                                  ctx->ProjectionMatrixStack.Top->inv );
 708          }
 709       }
 710    }
 711 #endif
 712 }
 713
 714
 715 /**
 716  * Calculate the combined modelview-projection matrix.
 717  *
 718  * \param ctx GL context.
 719  *
 720  * Multiplies the top matrices of the projection and model view stacks into
 721  * __GLcontextRec::_ModelProjectMatrix via _math_matrix_mul_matrix() and
 722  * analyzes the resulting matrix via _math_matrix_analyse().
 723  */
 724 static void
 725 calculate_model_project_matrix( GLcontext *ctx )
 726 {
 727    _math_matrix_mul_matrix( &ctx->_ModelProjectMatrix,
 728                             ctx->ProjectionMatrixStack.Top,
 729                             ctx->ModelviewMatrixStack.Top );
 730
 731    _math_matrix_analyse( &ctx->_ModelProjectMatrix );
 732 }
 733
 734
 735 /**
 736  * Updates the combined modelview-projection matrix.
 737  *
 738  * \param ctx GL context.
 739  * \param new_state new state bit mask.
 740  *
 741  * If there is a new model view matrix then analyzes it. If there is a new
 742  * projection matrix, updates it. Finally calls
 743  * calculate_model_project_matrix() to recalculate the modelview-projection
 744  * matrix.
 745  */
 746 void _mesa_update_modelview_project( GLcontext *ctx, GLuint new_state )
 747 {
 748    if (new_state & _NEW_MODELVIEW)
 749       _math_matrix_analyse( ctx->ModelviewMatrixStack.Top );
 750
 751    if (new_state & _NEW_PROJECTION)
 752       update_projection( ctx );
 753
 754    /* Keep ModelviewProject uptodate always to allow tnl
 755     * implementations that go model->clip even when eye is required.
 756     */
 757    calculate_model_project_matrix(ctx);
 758 }
 759
 760 /*@}*/
 761
 762
 763 /**********************************************************************/
 764 /** Matrix stack initialization */
 765 /*@{*/
 766
 767
 768 /**
 769  * Initialize a matrix stack.
 770  *
 771  * \param stack matrix stack.
 772  * \param maxDepth maximum stack depth.
 773  * \param dirtyFlag dirty flag.
 774  *
 775  * Allocates an array of \p maxDepth elements for the matrix stack and calls
 776  * _math_matrix_ctr() and _math_matrix_alloc_inv() for each element to
 777  * initialize it.
 778  */
 779 static void
 780 init_matrix_stack( struct matrix_stack *stack,
 781                    GLuint maxDepth, GLuint dirtyFlag )
 782 {
 783    GLuint i;
 784
 785    stack->Depth = 0;
 786    stack->MaxDepth = maxDepth;
 787    stack->DirtyFlag = dirtyFlag;
 788    /* The stack */
 789    stack->Stack = (GLmatrix *) CALLOC(maxDepth * sizeof(GLmatrix));
 790    for (i = 0; i < maxDepth; i++) {
 791       _math_matrix_ctr(&stack->Stack[i]);
 792       _math_matrix_alloc_inv(&stack->Stack[i]);
 793    }
 794    stack->Top = stack->Stack;
 795 }
 796
 797 /**
 798  * Free matrix stack.
 799  *
 800  * \param stack matrix stack.
 801  *
 802  * Calls _math_matrix_dtr() for each element of the matrix stack and
 803  * frees the array.
 804  */
 805 static void
 806 free_matrix_stack( struct matrix_stack *stack )
 807 {
 808    GLuint i;
 809    for (i = 0; i < stack->MaxDepth; i++) {
 810       _math_matrix_dtr(&stack->Stack[i]);
 811    }
 812    FREE(stack->Stack);
 813    stack->Stack = stack->Top = NULL;
 814 }
 815
 816 /*@}*/
 817
 818
 819 /**********************************************************************/
 820 /** \name Initialization */
 821 /*@{*/
 822
 823
 824 /**
 825  * Initialize the context matrix data.
 826  *
 827  * \param ctx GL context.
 828  *
 829  * Initializes each of the matrix stacks and the combined modelview-projection
 830  * matrix.
 831  */
 832 void _mesa_init_matrix( GLcontext * ctx )
 833 {
 834    GLint i;
 835
 836    /* Initialize matrix stacks */
 837    init_matrix_stack(&ctx->ModelviewMatrixStack, MAX_MODELVIEW_STACK_DEPTH,
 838                      _NEW_MODELVIEW);
 839    init_matrix_stack(&ctx->ProjectionMatrixStack, MAX_PROJECTION_STACK_DEPTH,
 840                      _NEW_PROJECTION);
 841    init_matrix_stack(&ctx->ColorMatrixStack, MAX_COLOR_STACK_DEPTH,
 842                      _NEW_COLOR_MATRIX);
 843    for (i = 0; i < MAX_TEXTURE_UNITS; i++)
 844       init_matrix_stack(&ctx->TextureMatrixStack[i], MAX_TEXTURE_STACK_DEPTH,
 845                         _NEW_TEXTURE_MATRIX);
 846    for (i = 0; i < MAX_PROGRAM_MATRICES; i++)
 847       init_matrix_stack(&ctx->ProgramMatrixStack[i],
 848                         MAX_PROGRAM_MATRIX_STACK_DEPTH, _NEW_TRACK_MATRIX);
 849    ctx->CurrentStack = &ctx->ModelviewMatrixStack;
 850
 851    /* Init combined Modelview*Projection matrix */
 852    _math_matrix_ctr( &ctx->_ModelProjectMatrix );
 853 }
 854
 855
 856 /**
 857  * Free the context matrix data.
 858  *
 859  * \param ctx GL context.
 860  *
 861  * Frees each of the matrix stacks and the combined modelview-projection
 862  * matrix.
 863  */
 864 void _mesa_free_matrix_data( GLcontext *ctx )
 865 {
 866    GLint i;
 867
 868    free_matrix_stack(&ctx->ModelviewMatrixStack);
 869    free_matrix_stack(&ctx->ProjectionMatrixStack);
 870    free_matrix_stack(&ctx->ColorMatrixStack);
 871    for (i = 0; i < MAX_TEXTURE_UNITS; i++)
 872       free_matrix_stack(&ctx->TextureMatrixStack[i]);
 873    for (i = 0; i < MAX_PROGRAM_MATRICES; i++)
 874       free_matrix_stack(&ctx->ProgramMatrixStack[i]);
 875    /* combined Modelview*Projection matrix */
 876    _math_matrix_dtr( &ctx->_ModelProjectMatrix );
 877
 878 }
 879
 880
 881 /**
 882  * Initialize the context transform attribute group.
 883  *
 884  * \param ctx GL context.
 885  *
 886  * \todo Move this to a new file with other 'transform' routines.
 887  */
 888 void _mesa_init_transform( GLcontext *ctx )
 889 {
 890    GLint i;
 891
 892    /* Transformation group */
 893    ctx->Transform.MatrixMode = GL_MODELVIEW;
 894    ctx->Transform.Normalize = GL_FALSE;
 895    ctx->Transform.RescaleNormals = GL_FALSE;
 896    ctx->Transform.RasterPositionUnclipped = GL_FALSE;
 897    for (i=0;i<MAX_CLIP_PLANES;i++) {
 898       ASSIGN_4V( ctx->Transform.EyeUserPlane[i], 0.0, 0.0, 0.0, 0.0 );
 899    }
 900    ctx->Transform.ClipPlanesEnabled = 0;
 901 }
 902
 903
 904 /**
 905  * Initialize the context viewport attribute group.
 906  *
 907  * \param ctx GL context.
 908  *
 909  * \todo Move this to a new file with other 'viewport' routines.
 910  */
 911 void _mesa_init_viewport( GLcontext *ctx )
 912 {
 913    /* Viewport group */
 914    ctx->Viewport.X = 0;
 915    ctx->Viewport.Y = 0;
 916    ctx->Viewport.Width = 0;
 917    ctx->Viewport.Height = 0;
 918    ctx->Viewport.Near = 0.0;
 919    ctx->Viewport.Far = 1.0;
 920    _math_matrix_ctr(&ctx->Viewport._WindowMap);
 921
 922 #define Sz 10
 923 #define Tz 14
 924    ctx->Viewport._WindowMap.m[Sz] = 0.5F * ctx->DepthMaxF;
 925    ctx->Viewport._WindowMap.m[Tz] = 0.5F * ctx->DepthMaxF;
 926 #undef Sz
 927 #undef Tz
 928
 929    ctx->Viewport._WindowMap.flags = MAT_FLAG_GENERAL_SCALE|MAT_FLAG_TRANSLATION;
 930    ctx->Viewport._WindowMap.type = MATRIX_3D_NO_ROT;
 931 }
 932
 933
 934 /**
 935  * Free the context viewport attribute group data.
 936  *
 937  * \param ctx GL context.
 938  *
 939  * \todo Move this to a new file with other 'viewport' routines.
 940  */
 941 void _mesa_free_viewport_data( GLcontext *ctx )
 942 {
 943    _math_matrix_dtr(&ctx->Viewport._WindowMap);
 944 }
 945
 946 /*@}*/