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  1. /*
  2.  * Mesa 3-D graphics library
  3.  * Version:  6.3
  4.  *
  5.  * Copyright (C) 1999-2005  Brian Paul   All Rights Reserved.
  6.  *
  7.  * Permission is hereby granted, free of charge, to any person obtaining a
  8.  * copy of this software and associated documentation files (the "Software"),
  9.  * to deal in the Software without restriction, including without limitation
  10.  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11.  * and/or sell copies of the Software, and to permit persons to whom the
  12.  * Software is furnished to do so, subject to the following conditions:
  13.  *
  14.  * The above copyright notice and this permission notice shall be included
  15.  * in all copies or substantial portions of the Software.
  16.  *
  17.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18.  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20.  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21.  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22.  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23.  */
  24.  
  25.  
  26. #include "glheader.h"
  27. #include "clip.h"
  28. #include "context.h"
  29. #include "macros.h"
  30. #include "mtypes.h"
  31.  
  32. #include "math/m_matrix.h"
  33.  
  34.  
  35.  
  36. /**********************************************************************/
  37. /*                     Get/Set User clip-planes.                      */
  38. /**********************************************************************/
  39.  
  40.  
  41.  
  42. void GLAPIENTRY
  43. _mesa_ClipPlane( GLenum plane, const GLdouble *eq )
  44. {
  45.    GET_CURRENT_CONTEXT(ctx);
  46.    GLint p;
  47.    GLfloat equation[4];
  48.    ASSERT_OUTSIDE_BEGIN_END(ctx);
  49.  
  50.    p = (GLint) plane - (GLint) GL_CLIP_PLANE0;
  51.    if (p < 0 || p >= (GLint) ctx->Const.MaxClipPlanes) {
  52.       _mesa_error( ctx, GL_INVALID_ENUM, "glClipPlane" );
  53.       return;
  54.    }
  55.  
  56.    equation[0] = (GLfloat) eq[0];
  57.    equation[1] = (GLfloat) eq[1];
  58.    equation[2] = (GLfloat) eq[2];
  59.    equation[3] = (GLfloat) eq[3];
  60.  
  61.    /*
  62.     * The equation is transformed by the transpose of the inverse of the
  63.     * current modelview matrix and stored in the resulting eye coordinates.
  64.     *
  65.     * KW: Eqn is then transformed to the current clip space, where user
  66.     * clipping now takes place.  The clip-space equations are recalculated
  67.     * whenever the projection matrix changes.
  68.     */
  69.    if (_math_matrix_is_dirty(ctx->ModelviewMatrixStack.Top))
  70.       _math_matrix_analyse( ctx->ModelviewMatrixStack.Top );
  71.  
  72.    _mesa_transform_vector( equation, equation,
  73.                            ctx->ModelviewMatrixStack.Top->inv );
  74.  
  75.    if (TEST_EQ_4V(ctx->Transform.EyeUserPlane[p], equation))
  76.       return;
  77.  
  78.    FLUSH_VERTICES(ctx, _NEW_TRANSFORM);
  79.    COPY_4FV(ctx->Transform.EyeUserPlane[p], equation);
  80.  
  81.    /* Update derived state.  This state also depends on the projection
  82.     * matrix, and is recalculated on changes to the projection matrix by
  83.     * code in _mesa_update_state().
  84.     */
  85.    if (ctx->Transform.ClipPlanesEnabled & (1 << p)) {
  86.       if (_math_matrix_is_dirty(ctx->ProjectionMatrixStack.Top))
  87.          _math_matrix_analyse( ctx->ProjectionMatrixStack.Top );
  88.  
  89.       _mesa_transform_vector( ctx->Transform._ClipUserPlane[p],
  90.                            ctx->Transform.EyeUserPlane[p],
  91.                            ctx->ProjectionMatrixStack.Top->inv );
  92.    }
  93.  
  94.    if (ctx->Driver.ClipPlane)
  95.       ctx->Driver.ClipPlane( ctx, plane, equation );
  96. }
  97.  
  98.  
  99. void GLAPIENTRY
  100. _mesa_GetClipPlane( GLenum plane, GLdouble *equation )
  101. {
  102.    GET_CURRENT_CONTEXT(ctx);
  103.    GLint p;
  104.    ASSERT_OUTSIDE_BEGIN_END(ctx);
  105.  
  106.    p = (GLint) (plane - GL_CLIP_PLANE0);
  107.    if (p < 0 || p >= (GLint) ctx->Const.MaxClipPlanes) {
  108.       _mesa_error( ctx, GL_INVALID_ENUM, "glGetClipPlane" );
  109.       return;
  110.    }
  111.  
  112.    equation[0] = (GLdouble) ctx->Transform.EyeUserPlane[p][0];
  113.    equation[1] = (GLdouble) ctx->Transform.EyeUserPlane[p][1];
  114.    equation[2] = (GLdouble) ctx->Transform.EyeUserPlane[p][2];
  115.    equation[3] = (GLdouble) ctx->Transform.EyeUserPlane[p][3];
  116. }
  117.