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:  6.3
  14  *
  15  * Copyright (C) 1999-2005  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 "context.h"
  39 #include "enums.h"
  40 #include "macros.h"
  41 #include "matrix.h"
  42 #include "mtypes.h"
  43 #include "math/m_matrix.h"
  44 #include "math/m_xform.h"
  45
  46
  47 /**
  48  * Apply a perspective projection matrix.
  49  *
  50  * \param left left clipping plane coordinate.
  51  * \param right right clipping plane coordinate.
  52  * \param bottom bottom clipping plane coordinate.
  53  * \param top top clipping plane coordinate.
  54  * \param nearval distance to the near clipping plane.
  55  * \param farval distance to the far clipping plane.
  56  *
  57  * \sa glFrustum().
  58  *
  59  * Flushes vertices and validates parameters. Calls _math_matrix_frustum() with
  60  * the top matrix of the current matrix stack and sets
  61  * __GLcontextRec::NewState.
  62  */
  63 void GLAPIENTRY
  64 _mesa_Frustum( GLdouble left, GLdouble right,
  65                GLdouble bottom, GLdouble top,
  66                GLdouble nearval, GLdouble farval )
  67 {
  68    GET_CURRENT_CONTEXT(ctx);
  69    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
  70
  71    if (nearval <= 0.0 ||
  72        farval <= 0.0 ||
  73        nearval == farval ||
  74        left == right ||
  75        top == bottom)
  76    {
  77       _mesa_error( ctx,  GL_INVALID_VALUE, "glFrustum" );
  78       return;
  79    }
  80
  81    _math_matrix_frustum( ctx->CurrentStack->Top,
  82                          (GLfloat) left, (GLfloat) right,
  83                          (GLfloat) bottom, (GLfloat) top,
  84                          (GLfloat) nearval, (GLfloat) farval );
  85    ctx->NewState |= ctx->CurrentStack->DirtyFlag;
  86 }
  87
  88
  89 /**
  90  * Apply an orthographic projection matrix.
  91  *
  92  * \param left left clipping plane coordinate.
  93  * \param right right clipping plane coordinate.
  94  * \param bottom bottom clipping plane coordinate.
  95  * \param top top clipping plane coordinate.
  96  * \param nearval distance to the near clipping plane.
  97  * \param farval distance to the far clipping plane.
  98  *
  99  * \sa glOrtho().
 100  *
 101  * Flushes vertices and validates parameters. Calls _math_matrix_ortho() with
 102  * the top matrix of the current matrix stack and sets
 103  * __GLcontextRec::NewState.
 104  */
 105 void GLAPIENTRY
 106 _mesa_Ortho( GLdouble left, GLdouble right,
 107              GLdouble bottom, GLdouble top,
 108              GLdouble nearval, GLdouble farval )
 109 {
 110    GET_CURRENT_CONTEXT(ctx);
 111    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 112
 113    if (MESA_VERBOSE & VERBOSE_API)
 114       _mesa_debug(ctx, "glOrtho(%f, %f, %f, %f, %f, %f)\n",
 115                   left, right, bottom, top, nearval, farval);
 116
 117    if (left == right ||
 118        bottom == top ||
 119        nearval == farval)
 120    {
 121       _mesa_error( ctx,  GL_INVALID_VALUE, "glOrtho" );
 122       return;
 123    }
 124
 125    _math_matrix_ortho( ctx->CurrentStack->Top,
 126                        (GLfloat) left, (GLfloat) right,
 127                        (GLfloat) bottom, (GLfloat) top,
 128                        (GLfloat) nearval, (GLfloat) farval );
 129    ctx->NewState |= ctx->CurrentStack->DirtyFlag;
 130 }
 131
 132
 133 /**
 134  * Set the current matrix stack.
 135  *
 136  * \param mode matrix stack.
 137  *
 138  * \sa glMatrixMode().
 139  *
 140  * Flushes the vertices, validates the parameter and updates
 141  * __GLcontextRec::CurrentStack and gl_transform_attrib::MatrixMode with the
 142  * specified matrix stack.
 143  */
 144 void GLAPIENTRY
 145 _mesa_MatrixMode( GLenum mode )
 146 {
 147    GET_CURRENT_CONTEXT(ctx);
 148    ASSERT_OUTSIDE_BEGIN_END(ctx);
 149
 150    if (ctx->Transform.MatrixMode == mode && mode != GL_TEXTURE)
 151       return;
 152    FLUSH_VERTICES(ctx, _NEW_TRANSFORM);
 153
 154    switch (mode) {
 155    case GL_MODELVIEW:
 156       ctx->CurrentStack = &ctx->ModelviewMatrixStack;
 157       break;
 158    case GL_PROJECTION:
 159       ctx->CurrentStack = &ctx->ProjectionMatrixStack;
 160       break;
 161    case GL_TEXTURE:
 162       ctx->CurrentStack = &ctx->TextureMatrixStack[ctx->Texture.CurrentUnit];
 163       break;
 164    case GL_COLOR:
 165       ctx->CurrentStack = &ctx->ColorMatrixStack;
 166       break;
 167    case GL_MATRIX0_NV:
 168    case GL_MATRIX1_NV:
 169    case GL_MATRIX2_NV:
 170    case GL_MATRIX3_NV:
 171    case GL_MATRIX4_NV:
 172    case GL_MATRIX5_NV:
 173    case GL_MATRIX6_NV:
 174    case GL_MATRIX7_NV:
 175       if (ctx->Extensions.NV_vertex_program) {
 176          ctx->CurrentStack = &ctx->ProgramMatrixStack[mode - GL_MATRIX0_NV];
 177       }
 178       else {
 179          _mesa_error( ctx,  GL_INVALID_ENUM, "glMatrixMode(mode)" );
 180          return;
 181       }
 182       break;
 183    case GL_MATRIX0_ARB:
 184    case GL_MATRIX1_ARB:
 185    case GL_MATRIX2_ARB:
 186    case GL_MATRIX3_ARB:
 187    case GL_MATRIX4_ARB:
 188    case GL_MATRIX5_ARB:
 189    case GL_MATRIX6_ARB:
 190    case GL_MATRIX7_ARB:
 191       if (ctx->Extensions.ARB_vertex_program ||
 192           ctx->Extensions.ARB_fragment_program) {
 193          const GLuint m = mode - GL_MATRIX0_ARB;
 194          if (m > ctx->Const.MaxProgramMatrices) {
 195             _mesa_error(ctx, GL_INVALID_ENUM,
 196                         "glMatrixMode(GL_MATRIX%d_ARB)", m);
 197             return;
 198          }
 199          ctx->CurrentStack = &ctx->ProgramMatrixStack[m];
 200       }
 201       else {
 202          _mesa_error( ctx,  GL_INVALID_ENUM, "glMatrixMode(mode)" );
 203          return;
 204       }
 205       break;
 206    default:
 207       _mesa_error( ctx,  GL_INVALID_ENUM, "glMatrixMode(mode)" );
 208       return;
 209    }
 210
 211    ctx->Transform.MatrixMode = mode;
 212 }
 213
 214
 215 /**
 216  * Push the current matrix stack.
 217  *
 218  * \sa glPushMatrix().
 219  *
 220  * Verifies the current matrix stack is not full, and duplicates the top-most
 221  * matrix in the stack. Marks __GLcontextRec::NewState with the stack dirty
 222  * flag.
 223  */
 224 void GLAPIENTRY
 225 _mesa_PushMatrix( void )
 226 {
 227    GET_CURRENT_CONTEXT(ctx);
 228    struct matrix_stack *stack = ctx->CurrentStack;
 229    ASSERT_OUTSIDE_BEGIN_END(ctx);
 230
 231    if (MESA_VERBOSE&VERBOSE_API)
 232       _mesa_debug(ctx, "glPushMatrix %s\n",
 233                   _mesa_lookup_enum_by_nr(ctx->Transform.MatrixMode));
 234
 235    if (stack->Depth + 1 >= stack->MaxDepth) {
 236       if (ctx->Transform.MatrixMode == GL_TEXTURE) {
 237          _mesa_error(ctx,  GL_STACK_OVERFLOW,
 238                      "glPushMatrix(mode=GL_TEXTURE, unit=%d)",
 239                       ctx->Texture.CurrentUnit);
 240       }
 241       else {
 242          _mesa_error(ctx,  GL_STACK_OVERFLOW, "glPushMatrix(mode=%s)",
 243                      _mesa_lookup_enum_by_nr(ctx->Transform.MatrixMode));
 244       }
 245       return;
 246    }
 247    _math_matrix_copy( &stack->Stack[stack->Depth + 1],
 248                       &stack->Stack[stack->Depth] );
 249    stack->Depth++;
 250    stack->Top = &(stack->Stack[stack->Depth]);
 251    ctx->NewState |= stack->DirtyFlag;
 252 }
 253
 254
 255 /**
 256  * Pop the current matrix stack.
 257  *
 258  * \sa glPopMatrix().
 259  *
 260  * Flushes the vertices, verifies the current matrix stack is not empty, and
 261  * moves the stack head down. Marks __GLcontextRec::NewState with the dirty
 262  * stack flag.
 263  */
 264 void GLAPIENTRY
 265 _mesa_PopMatrix( void )
 266 {
 267    GET_CURRENT_CONTEXT(ctx);
 268    struct matrix_stack *stack = ctx->CurrentStack;
 269    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 270
 271    if (MESA_VERBOSE&VERBOSE_API)
 272       _mesa_debug(ctx, "glPopMatrix %s\n",
 273                   _mesa_lookup_enum_by_nr(ctx->Transform.MatrixMode));
 274
 275    if (stack->Depth == 0) {
 276       if (ctx->Transform.MatrixMode == GL_TEXTURE) {
 277          _mesa_error(ctx,  GL_STACK_UNDERFLOW,
 278                      "glPopMatrix(mode=GL_TEXTURE, unit=%d)",
 279                       ctx->Texture.CurrentUnit);
 280       }
 281       else {
 282          _mesa_error(ctx,  GL_STACK_UNDERFLOW, "glPopMatrix(mode=%s)",
 283                      _mesa_lookup_enum_by_nr(ctx->Transform.MatrixMode));
 284       }
 285       return;
 286    }
 287    stack->Depth--;
 288    stack->Top = &(stack->Stack[stack->Depth]);
 289    ctx->NewState |= stack->DirtyFlag;
 290 }
 291
 292
 293 /**
 294  * Replace the current matrix with the identity matrix.
 295  *
 296  * \sa glLoadIdentity().
 297  *
 298  * Flushes the vertices and calls _math_matrix_set_identity() with the top-most
 299  * matrix in the current stack. Marks __GLcontextRec::NewState with the stack
 300  * dirty flag.
 301  */
 302 void GLAPIENTRY
 303 _mesa_LoadIdentity( void )
 304 {
 305    GET_CURRENT_CONTEXT(ctx);
 306    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 307
 308    if (MESA_VERBOSE & VERBOSE_API)
 309       _mesa_debug(ctx, "glLoadIdentity()");
 310
 311    _math_matrix_set_identity( ctx->CurrentStack->Top );
 312    ctx->NewState |= ctx->CurrentStack->DirtyFlag;
 313 }
 314
 315
 316 /**
 317  * Replace the current matrix with a given matrix.
 318  *
 319  * \param m matrix.
 320  *
 321  * \sa glLoadMatrixf().
 322  *
 323  * Flushes the vertices and calls _math_matrix_loadf() with the top-most matrix
 324  * in the current stack and the given matrix. Marks __GLcontextRec::NewState
 325  * with the dirty stack flag.
 326  */
 327 void GLAPIENTRY
 328 _mesa_LoadMatrixf( const GLfloat *m )
 329 {
 330    GET_CURRENT_CONTEXT(ctx);
 331    if (!m) return;
 332    if (MESA_VERBOSE & VERBOSE_API)
 333       _mesa_debug(ctx,
 334           "glLoadMatrix(%f %f %f %f, %f %f %f %f, %f %f %f %f, %f %f %f %f\n",
 335           m[0], m[4], m[8], m[12],
 336           m[1], m[5], m[9], m[13],
 337           m[2], m[6], m[10], m[14],
 338           m[3], m[7], m[11], m[15]);
 339
 340    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 341    _math_matrix_loadf( ctx->CurrentStack->Top, m );
 342    ctx->NewState |= ctx->CurrentStack->DirtyFlag;
 343 }
 344
 345
 346 /**
 347  * Multiply the current matrix with a given matrix.
 348  *
 349  * \param m matrix.
 350  *
 351  * \sa glMultMatrixf().
 352  *
 353  * Flushes the vertices and calls _math_matrix_mul_floats() with the top-most
 354  * matrix in the current stack and the given matrix. Marks
 355  * __GLcontextRec::NewState with the dirty stack flag.
 356  */
 357 void GLAPIENTRY
 358 _mesa_MultMatrixf( const GLfloat *m )
 359 {
 360    GET_CURRENT_CONTEXT(ctx);
 361    if (!m) return;
 362    if (MESA_VERBOSE & VERBOSE_API)
 363       _mesa_debug(ctx,
 364           "glMultMatrix(%f %f %f %f, %f %f %f %f, %f %f %f %f, %f %f %f %f\n",
 365           m[0], m[4], m[8], m[12],
 366           m[1], m[5], m[9], m[13],
 367           m[2], m[6], m[10], m[14],
 368           m[3], m[7], m[11], m[15]);
 369    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 370    _math_matrix_mul_floats( ctx->CurrentStack->Top, m );
 371    ctx->NewState |= ctx->CurrentStack->DirtyFlag;
 372 }
 373
 374
 375 /**
 376  * Multiply the current matrix with a rotation matrix.
 377  *
 378  * \param angle angle of rotation, in degrees.
 379  * \param x rotation vector x coordinate.
 380  * \param y rotation vector y coordinate.
 381  * \param z rotation vector z coordinate.
 382  *
 383  * \sa glRotatef().
 384  *
 385  * Flushes the vertices and calls _math_matrix_rotate() with the top-most
 386  * matrix in the current stack and the given parameters. Marks
 387  * __GLcontextRec::NewState with the dirty stack flag.
 388  */
 389 void GLAPIENTRY
 390 _mesa_Rotatef( GLfloat angle, GLfloat x, GLfloat y, GLfloat z )
 391 {
 392    GET_CURRENT_CONTEXT(ctx);
 393    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 394    if (angle != 0.0F) {
 395       _math_matrix_rotate( ctx->CurrentStack->Top, angle, x, y, z);
 396       ctx->NewState |= ctx->CurrentStack->DirtyFlag;
 397    }
 398 }
 399
 400
 401 /**
 402  * Multiply the current matrix with a general scaling matrix.
 403  *
 404  * \param x x axis scale factor.
 405  * \param y y axis scale factor.
 406  * \param z z axis scale factor.
 407  *
 408  * \sa glScalef().
 409  *
 410  * Flushes the vertices and calls _math_matrix_scale() with the top-most
 411  * matrix in the current stack and the given parameters. Marks
 412  * __GLcontextRec::NewState with the dirty stack flag.
 413  */
 414 void GLAPIENTRY
 415 _mesa_Scalef( GLfloat x, GLfloat y, GLfloat z )
 416 {
 417    GET_CURRENT_CONTEXT(ctx);
 418    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 419    _math_matrix_scale( ctx->CurrentStack->Top, x, y, z);
 420    ctx->NewState |= ctx->CurrentStack->DirtyFlag;
 421 }
 422
 423
 424 /**
 425  * Multiply the current matrix with a general scaling matrix.
 426  *
 427  * \param x translation vector x coordinate.
 428  * \param y translation vector y coordinate.
 429  * \param z translation vector z coordinate.
 430  *
 431  * \sa glTranslatef().
 432  *
 433  * Flushes the vertices and calls _math_matrix_translate() with the top-most
 434  * matrix in the current stack and the given parameters. Marks
 435  * __GLcontextRec::NewState with the dirty stack flag.
 436  */
 437 void GLAPIENTRY
 438 _mesa_Translatef( GLfloat x, GLfloat y, GLfloat z )
 439 {
 440    GET_CURRENT_CONTEXT(ctx);
 441    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 442    _math_matrix_translate( ctx->CurrentStack->Top, x, y, z);
 443    ctx->NewState |= ctx->CurrentStack->DirtyFlag;
 444 }
 445
 446
 447 #if _HAVE_FULL_GL
 448 void GLAPIENTRY
 449 _mesa_LoadMatrixd( const GLdouble *m )
 450 {
 451    GLint i;
 452    GLfloat f[16];
 453    if (!m) return;
 454    for (i = 0; i < 16; i++)
 455       f[i] = (GLfloat) m[i];
 456    _mesa_LoadMatrixf(f);
 457 }
 458
 459 void GLAPIENTRY
 460 _mesa_MultMatrixd( const GLdouble *m )
 461 {
 462    GLint i;
 463    GLfloat f[16];
 464    if (!m) return;
 465    for (i = 0; i < 16; i++)
 466       f[i] = (GLfloat) m[i];
 467    _mesa_MultMatrixf( f );
 468 }
 469
 470
 471 void GLAPIENTRY
 472 _mesa_Rotated( GLdouble angle, GLdouble x, GLdouble y, GLdouble z )
 473 {
 474    _mesa_Rotatef((GLfloat) angle, (GLfloat) x, (GLfloat) y, (GLfloat) z);
 475 }
 476
 477
 478 void GLAPIENTRY
 479 _mesa_Scaled( GLdouble x, GLdouble y, GLdouble z )
 480 {
 481    _mesa_Scalef((GLfloat) x, (GLfloat) y, (GLfloat) z);
 482 }
 483
 484
 485 void GLAPIENTRY
 486 _mesa_Translated( GLdouble x, GLdouble y, GLdouble z )
 487 {
 488    _mesa_Translatef((GLfloat) x, (GLfloat) y, (GLfloat) z);
 489 }
 490 #endif
 491
 492
 493 #if _HAVE_FULL_GL
 494 void GLAPIENTRY
 495 _mesa_LoadTransposeMatrixfARB( const GLfloat *m )
 496 {
 497    GLfloat tm[16];
 498    if (!m) return;
 499    _math_transposef(tm, m);
 500    _mesa_LoadMatrixf(tm);
 501 }
 502
 503
 504 void GLAPIENTRY
 505 _mesa_LoadTransposeMatrixdARB( const GLdouble *m )
 506 {
 507    GLfloat tm[16];
 508    if (!m) return;
 509    _math_transposefd(tm, m);
 510    _mesa_LoadMatrixf(tm);
 511 }
 512
 513
 514 void GLAPIENTRY
 515 _mesa_MultTransposeMatrixfARB( const GLfloat *m )
 516 {
 517    GLfloat tm[16];
 518    if (!m) return;
 519    _math_transposef(tm, m);
 520    _mesa_MultMatrixf(tm);
 521 }
 522
 523
 524 void GLAPIENTRY
 525 _mesa_MultTransposeMatrixdARB( const GLdouble *m )
 526 {
 527    GLfloat tm[16];
 528    if (!m) return;
 529    _math_transposefd(tm, m);
 530    _mesa_MultMatrixf(tm);
 531 }
 532 #endif
 533
 534 /**
 535  * Set the viewport.
 536  *
 537  * \param x, y coordinates of the lower-left corner of the viewport rectangle.
 538  * \param width width of the viewport rectangle.
 539  * \param height height of the viewport rectangle.
 540  *
 541  * \sa Called via glViewport() or display list execution.
 542  *
 543  * Flushes the vertices and calls _mesa_set_viewport() with the given
 544  * parameters.
 545  */
 546 void GLAPIENTRY
 547 _mesa_Viewport( GLint x, GLint y, GLsizei width, GLsizei height )
 548 {
 549    GET_CURRENT_CONTEXT(ctx);
 550    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 551    _mesa_set_viewport(ctx, x, y, width, height);
 552 }
 553
 554 /**
 555  * Set new viewport parameters and update derived state (the _WindowMap
 556  * matrix).  Usually called from _mesa_Viewport().
 557  *
 558  * \param ctx GL context.
 559  * \param x, y coordinates of the lower left corner of the viewport rectangle.
 560  * \param width width of the viewport rectangle.
 561  * \param height height of the viewport rectangle.
 562  *
 563  * Verifies the parameters, clamps them to the implementation dependent range
 564  * and updates __GLcontextRec::Viewport. Computes the scale and bias values for
 565  * the drivers and notifies the driver via the dd_function_table::Viewport
 566  * callback.
 567  */
 568 void
 569 _mesa_set_viewport( GLcontext *ctx, GLint x, GLint y,
 570                     GLsizei width, GLsizei height )
 571 {
 572    const GLfloat n = ctx->Viewport.Near;
 573    const GLfloat f = ctx->Viewport.Far;
 574
 575    if (MESA_VERBOSE & VERBOSE_API)
 576       _mesa_debug(ctx, "glViewport %d %d %d %d\n", x, y, width, height);
 577
 578    if (width < 0 || height < 0) {
 579       _mesa_error( ctx,  GL_INVALID_VALUE,
 580                    "glViewport(%d, %d, %d, %d)", x, y, width, height );
 581       return;
 582    }
 583
 584    /* clamp width, and height to implementation dependent range */
 585    width  = CLAMP( width,  1, ctx->Const.MaxViewportWidth );
 586    height = CLAMP( height, 1, ctx->Const.MaxViewportHeight );
 587
 588    /* Save viewport */
 589    ctx->Viewport.X = x;
 590    ctx->Viewport.Width = width;
 591    ctx->Viewport.Y = y;
 592    ctx->Viewport.Height = height;
 593
 594    /* XXX send transposed width/height to Driver.Viewport() below??? */
 595    if (ctx->_RotateMode) {
 596       GLint tmp, tmps;
 597       tmp = x; x = y; y = tmp;
 598       tmps = width; width = height; height = tmps;
 599    }
 600
 601    /* compute scale and bias values :: This is really driver-specific
 602     * and should be maintained elsewhere if at all.  NOTE: RasterPos
 603     * uses this.
 604     */
 605    ctx->Viewport._WindowMap.m[MAT_SX] = (GLfloat) width / 2.0F;
 606    ctx->Viewport._WindowMap.m[MAT_TX] = ctx->Viewport._WindowMap.m[MAT_SX] + x;
 607    ctx->Viewport._WindowMap.m[MAT_SY] = (GLfloat) height / 2.0F;
 608    ctx->Viewport._WindowMap.m[MAT_TY] = ctx->Viewport._WindowMap.m[MAT_SY] + y;
 609    ctx->Viewport._WindowMap.m[MAT_SZ] = ctx->DepthMaxF * ((f - n) / 2.0F);
 610    ctx->Viewport._WindowMap.m[MAT_TZ] = ctx->DepthMaxF * ((f - n) / 2.0F + n);
 611    ctx->Viewport._WindowMap.flags = MAT_FLAG_GENERAL_SCALE|MAT_FLAG_TRANSLATION;
 612    ctx->Viewport._WindowMap.type = MATRIX_3D_NO_ROT;
 613    ctx->NewState |= _NEW_VIEWPORT;
 614
 615    if (ctx->Driver.Viewport) {
 616       /* Many drivers will use this call to check for window size changes
 617        * and reallocate the z/stencil/accum/etc buffers if needed.
 618        */
 619       (*ctx->Driver.Viewport)( ctx, x, y, width, height );
 620    }
 621 }
 622
 623
 624 #if _HAVE_FULL_GL
 625 void GLAPIENTRY
 626 _mesa_DepthRange( GLclampd nearval, GLclampd farval )
 627 {
 628    /*
 629     * nearval - specifies mapping of the near clipping plane to window
 630     *   coordinates, default is 0
 631     * farval - specifies mapping of the far clipping plane to window
 632     *   coordinates, default is 1
 633     *
 634     * After clipping and div by w, z coords are in -1.0 to 1.0,
 635     * corresponding to near and far clipping planes.  glDepthRange
 636     * specifies a linear mapping of the normalized z coords in
 637     * this range to window z coords.
 638     */
 639    GLfloat n, f;
 640    GET_CURRENT_CONTEXT(ctx);
 641    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 642
 643    if (MESA_VERBOSE&VERBOSE_API)
 644       _mesa_debug(ctx, "glDepthRange %f %f\n", nearval, farval);
 645
 646    n = (GLfloat) CLAMP( nearval, 0.0, 1.0 );
 647    f = (GLfloat) CLAMP( farval, 0.0, 1.0 );
 648
 649    ctx->Viewport.Near = n;
 650    ctx->Viewport.Far = f;
 651    ctx->Viewport._WindowMap.m[MAT_SZ] = ctx->DepthMaxF * ((f - n) / 2.0F);
 652    ctx->Viewport._WindowMap.m[MAT_TZ] = ctx->DepthMaxF * ((f - n) / 2.0F + n);
 653    ctx->NewState |= _NEW_VIEWPORT;
 654
 655    if (ctx->Driver.DepthRange) {
 656       (*ctx->Driver.DepthRange)( ctx, nearval, farval );
 657    }
 658 }
 659 #endif
 660
 661
 662
 663 /**********************************************************************/
 664 /** \name State management */
 665 /*@{*/
 666
 667
 668 /**
 669  * Update the projection matrix stack.
 670  *
 671  * \param ctx GL context.
 672  *
 673  * Calls _math_matrix_analyse() with the top-matrix of the projection matrix
 674  * stack, and recomputes user clip positions if necessary.
 675  *
 676  * \note This routine references __GLcontextRec::Tranform attribute values to
 677  * compute userclip positions in clip space, but is only called on
 678  * _NEW_PROJECTION.  The _mesa_ClipPlane() function keeps these values up to
 679  * date across changes to the __GLcontextRec::Transform attributes.
 680  */
 681 static void
 682 update_projection( GLcontext *ctx )
 683 {
 684    _math_matrix_analyse( ctx->ProjectionMatrixStack.Top );
 685
 686 #if FEATURE_userclip
 687    /* Recompute clip plane positions in clipspace.  This is also done
 688     * in _mesa_ClipPlane().
 689     */
 690    if (ctx->Transform.ClipPlanesEnabled) {
 691       GLuint p;
 692       for (p = 0; p < ctx->Const.MaxClipPlanes; p++) {
 693          if (ctx->Transform.ClipPlanesEnabled & (1 << p)) {
 694             _mesa_transform_vector( ctx->Transform._ClipUserPlane[p],
 695                                  ctx->Transform.EyeUserPlane[p],
 696                                  ctx->ProjectionMatrixStack.Top->inv );
 697          }
 698       }
 699    }
 700 #endif
 701 }
 702
 703
 704 /**
 705  * Calculate the combined modelview-projection matrix.
 706  *
 707  * \param ctx GL context.
 708  *
 709  * Multiplies the top matrices of the projection and model view stacks into
 710  * __GLcontextRec::_ModelProjectMatrix via _math_matrix_mul_matrix() and
 711  * analyzes the resulting matrix via _math_matrix_analyse().
 712  */
 713 static void
 714 calculate_model_project_matrix( GLcontext *ctx )
 715 {
 716    _math_matrix_mul_matrix( &ctx->_ModelProjectMatrix,
 717                             ctx->ProjectionMatrixStack.Top,
 718                             ctx->ModelviewMatrixStack.Top );
 719
 720    _math_matrix_analyse( &ctx->_ModelProjectMatrix );
 721 }
 722
 723
 724 /**
 725  * Updates the combined modelview-projection matrix.
 726  *
 727  * \param ctx GL context.
 728  * \param new_state new state bit mask.
 729  *
 730  * If there is a new model view matrix then analyzes it. If there is a new
 731  * projection matrix, updates it. Finally calls
 732  * calculate_model_project_matrix() to recalculate the modelview-projection
 733  * matrix.
 734  */
 735 void _mesa_update_modelview_project( GLcontext *ctx, GLuint new_state )
 736 {
 737    if (new_state & _NEW_MODELVIEW) {
 738       _math_matrix_analyse( ctx->ModelviewMatrixStack.Top );
 739
 740       /* Bring cull position uptodate.
 741        */
 742       TRANSFORM_POINT3( ctx->Transform.CullObjPos,
 743                         ctx->ModelviewMatrixStack.Top->inv,
 744                         ctx->Transform.CullEyePos );
 745    }
 746
 747
 748    if (new_state & _NEW_PROJECTION)
 749       update_projection( ctx );
 750
 751    /* Keep ModelviewProject uptodate always to allow tnl
 752     * implementations that go model->clip even when eye is required.
 753     */
 754    calculate_model_project_matrix(ctx);
 755 }
 756
 757 /*@}*/
 758
 759
 760 /**********************************************************************/
 761 /** Matrix stack initialization */
 762 /*@{*/
 763
 764
 765 /**
 766  * Initialize a matrix stack.
 767  *
 768  * \param stack matrix stack.
 769  * \param maxDepth maximum stack depth.
 770  * \param dirtyFlag dirty flag.
 771  *
 772  * Allocates an array of \p maxDepth elements for the matrix stack and calls
 773  * _math_matrix_ctr() and _math_matrix_alloc_inv() for each element to
 774  * initialize it.
 775  */
 776 static void
 777 init_matrix_stack( struct matrix_stack *stack,
 778                    GLuint maxDepth, GLuint dirtyFlag )
 779 {
 780    GLuint i;
 781
 782    stack->Depth = 0;
 783    stack->MaxDepth = maxDepth;
 784    stack->DirtyFlag = dirtyFlag;
 785    /* The stack */
 786    stack->Stack = (GLmatrix *) CALLOC(maxDepth * sizeof(GLmatrix));
 787    for (i = 0; i < maxDepth; i++) {
 788       _math_matrix_ctr(&stack->Stack[i]);
 789       _math_matrix_alloc_inv(&stack->Stack[i]);
 790    }
 791    stack->Top = stack->Stack;
 792 }
 793
 794 /**
 795  * Free matrix stack.
 796  *
 797  * \param stack matrix stack.
 798  *
 799  * Calls _math_matrix_dtr() for each element of the matrix stack and
 800  * frees the array.
 801  */
 802 static void
 803 free_matrix_stack( struct matrix_stack *stack )
 804 {
 805    GLuint i;
 806    for (i = 0; i < stack->MaxDepth; i++) {
 807       _math_matrix_dtr(&stack->Stack[i]);
 808    }
 809    FREE(stack->Stack);
 810    stack->Stack = stack->Top = NULL;
 811 }
 812
 813 /*@}*/
 814
 815
 816 /**********************************************************************/
 817 /** \name Initialization */
 818 /*@{*/
 819
 820
 821 /**
 822  * Initialize the context matrix data.
 823  *
 824  * \param ctx GL context.
 825  *
 826  * Initializes each of the matrix stacks and the combined modelview-projection
 827  * matrix.
 828  */
 829 void _mesa_init_matrix( GLcontext * ctx )
 830 {
 831    GLint i;
 832
 833    /* Initialize matrix stacks */
 834    init_matrix_stack(&ctx->ModelviewMatrixStack, MAX_MODELVIEW_STACK_DEPTH,
 835                      _NEW_MODELVIEW);
 836    init_matrix_stack(&ctx->ProjectionMatrixStack, MAX_PROJECTION_STACK_DEPTH,
 837                      _NEW_PROJECTION);
 838    init_matrix_stack(&ctx->ColorMatrixStack, MAX_COLOR_STACK_DEPTH,
 839                      _NEW_COLOR_MATRIX);
 840    for (i = 0; i < MAX_TEXTURE_UNITS; i++)
 841       init_matrix_stack(&ctx->TextureMatrixStack[i], MAX_TEXTURE_STACK_DEPTH,
 842                         _NEW_TEXTURE_MATRIX);
 843    for (i = 0; i < MAX_PROGRAM_MATRICES; i++)
 844       init_matrix_stack(&ctx->ProgramMatrixStack[i],
 845                         MAX_PROGRAM_MATRIX_STACK_DEPTH, _NEW_TRACK_MATRIX);
 846    ctx->CurrentStack = &ctx->ModelviewMatrixStack;
 847
 848    /* Init combined Modelview*Projection matrix */
 849    _math_matrix_ctr( &ctx->_ModelProjectMatrix );
 850 }
 851
 852
 853 /**
 854  * Free the context matrix data.
 855  *
 856  * \param ctx GL context.
 857  *
 858  * Frees each of the matrix stacks and the combined modelview-projection
 859  * matrix.
 860  */
 861 void _mesa_free_matrix_data( GLcontext *ctx )
 862 {
 863    GLint i;
 864
 865    free_matrix_stack(&ctx->ModelviewMatrixStack);
 866    free_matrix_stack(&ctx->ProjectionMatrixStack);
 867    free_matrix_stack(&ctx->ColorMatrixStack);
 868    for (i = 0; i < MAX_TEXTURE_UNITS; i++)
 869       free_matrix_stack(&ctx->TextureMatrixStack[i]);
 870    for (i = 0; i < MAX_PROGRAM_MATRICES; i++)
 871       free_matrix_stack(&ctx->ProgramMatrixStack[i]);
 872    /* combined Modelview*Projection matrix */
 873    _math_matrix_dtr( &ctx->_ModelProjectMatrix );
 874
 875 }
 876
 877
 878 /**
 879  * Initialize the context transform attribute group.
 880  *
 881  * \param ctx GL context.
 882  *
 883  * \todo Move this to a new file with other 'transform' routines.
 884  */
 885 void _mesa_init_transform( GLcontext *ctx )
 886 {
 887    GLint i;
 888
 889    /* Transformation group */
 890    ctx->Transform.MatrixMode = GL_MODELVIEW;
 891    ctx->Transform.Normalize = GL_FALSE;
 892    ctx->Transform.RescaleNormals = GL_FALSE;
 893    ctx->Transform.RasterPositionUnclipped = GL_FALSE;
 894    for (i=0;i<MAX_CLIP_PLANES;i++) {
 895       ASSIGN_4V( ctx->Transform.EyeUserPlane[i], 0.0, 0.0, 0.0, 0.0 );
 896    }
 897    ctx->Transform.ClipPlanesEnabled = 0;
 898
 899    ASSIGN_4V( ctx->Transform.CullObjPos, 0.0, 0.0, 1.0, 0.0 );
 900    ASSIGN_4V( ctx->Transform.CullEyePos, 0.0, 0.0, 1.0, 0.0 );
 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 /*@}*/