Rev 55 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 55 | pj | 1 | /* $Id: nurbscrv.c,v 1.1 2003-02-28 11:42:07 pj Exp $ */ |
| 2 | |||
| 3 | /* |
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| 4 | * Mesa 3-D graphics library |
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| 5 | * Version: 3.3 |
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| 6 | * Copyright (C) 1995-2000 Brian Paul |
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| 7 | * |
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| 8 | * This library is free software; you can redistribute it and/or |
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| 9 | * modify it under the terms of the GNU Library General Public |
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| 10 | * License as published by the Free Software Foundation; either |
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| 11 | * version 2 of the License, or (at your option) any later version. |
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| 12 | * |
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| 13 | * This library is distributed in the hope that it will be useful, |
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| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 16 | * Library General Public License for more details. |
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| 17 | * |
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| 18 | * You should have received a copy of the GNU Library General Public |
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| 19 | * License along with this library; if not, write to the Free |
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| 20 | * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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| 21 | */ |
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| 22 | |||
| 23 | |||
| 24 | /* |
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| 25 | * NURBS implementation written by Bogdan Sikorski (bogdan@cira.it) |
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| 26 | * See README2 for more info. |
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| 27 | */ |
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| 28 | |||
| 29 | |||
| 30 | #ifdef PC_HEADER |
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| 31 | #include "all.h" |
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| 32 | #else |
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| 33 | #include <math.h> |
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| 34 | #include <stdlib.h> |
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| 35 | #include "gluP.h" |
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| 36 | #include "nurbs.h" |
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| 37 | #endif |
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| 38 | |||
| 39 | |||
| 40 | static int |
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| 41 | get_curve_dim(GLenum type) |
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| 42 | { |
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| 43 | switch (type) { |
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| 44 | case GL_MAP1_VERTEX_3: |
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| 45 | return 3; |
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| 46 | case GL_MAP1_VERTEX_4: |
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| 47 | return 4; |
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| 48 | case GL_MAP1_INDEX: |
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| 49 | return 1; |
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| 50 | case GL_MAP1_COLOR_4: |
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| 51 | return 4; |
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| 52 | case GL_MAP1_NORMAL: |
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| 53 | return 3; |
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| 54 | case GL_MAP1_TEXTURE_COORD_1: |
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| 55 | return 1; |
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| 56 | case GL_MAP1_TEXTURE_COORD_2: |
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| 57 | return 2; |
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| 58 | case GL_MAP1_TEXTURE_COORD_3: |
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| 59 | return 3; |
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| 60 | case GL_MAP1_TEXTURE_COORD_4: |
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| 61 | return 4; |
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| 62 | default: |
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| 63 | abort(); /* TODO: is this OK? */ |
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| 64 | } |
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| 65 | return 0; /*never get here */ |
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| 66 | } |
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| 67 | |||
| 68 | static GLenum |
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| 69 | test_nurbs_curve(GLUnurbsObj * nobj, curve_attribs * attribs) |
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| 70 | { |
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| 71 | GLenum err; |
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| 72 | GLint tmp_int; |
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| 73 | |||
| 74 | if (attribs->order < 0) { |
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| 75 | call_user_error(nobj, GLU_INVALID_VALUE); |
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| 76 | return GLU_ERROR; |
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| 77 | } |
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| 78 | glGetIntegerv(GL_MAX_EVAL_ORDER, &tmp_int); |
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| 79 | if (attribs->order > tmp_int || attribs->order < 2) { |
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| 80 | call_user_error(nobj, GLU_NURBS_ERROR1); |
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| 81 | return GLU_ERROR; |
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| 82 | } |
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| 83 | if (attribs->knot_count < attribs->order + 2) { |
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| 84 | call_user_error(nobj, GLU_NURBS_ERROR2); |
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| 85 | return GLU_ERROR; |
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| 86 | } |
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| 87 | if (attribs->stride < 0) { |
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| 88 | call_user_error(nobj, GLU_NURBS_ERROR34); |
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| 89 | return GLU_ERROR; |
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| 90 | } |
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| 91 | if (attribs->knot == NULL || attribs->ctrlarray == NULL) { |
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| 92 | call_user_error(nobj, GLU_NURBS_ERROR36); |
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| 93 | return GLU_ERROR; |
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| 94 | } |
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| 95 | if ((err = test_knot(attribs->knot_count, attribs->knot, attribs->order)) |
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| 96 | != GLU_NO_ERROR) { |
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| 97 | call_user_error(nobj, err); |
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| 98 | return GLU_ERROR; |
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| 99 | } |
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| 100 | return GLU_NO_ERROR; |
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| 101 | } |
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| 102 | |||
| 103 | static GLenum |
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| 104 | test_nurbs_curves(GLUnurbsObj * nobj) |
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| 105 | { |
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| 106 | /* test the geometric data */ |
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| 107 | if (test_nurbs_curve(nobj, &(nobj->curve.geom)) != GLU_NO_ERROR) |
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| 108 | return GLU_ERROR; |
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| 109 | /* now test the attributive data */ |
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| 110 | /* color */ |
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| 111 | if (nobj->curve.color.type != GLU_INVALID_ENUM) |
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| 112 | if (test_nurbs_curve(nobj, &(nobj->curve.color)) != GLU_NO_ERROR) |
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| 113 | return GLU_ERROR; |
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| 114 | /* normal */ |
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| 115 | if (nobj->curve.normal.type != GLU_INVALID_ENUM) |
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| 116 | if (test_nurbs_curve(nobj, &(nobj->curve.normal)) != GLU_NO_ERROR) |
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| 117 | return GLU_ERROR; |
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| 118 | /* texture */ |
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| 119 | if (nobj->curve.texture.type != GLU_INVALID_ENUM) |
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| 120 | if (test_nurbs_curve(nobj, &(nobj->curve.texture)) != GLU_NO_ERROR) |
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| 121 | return GLU_ERROR; |
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| 122 | return GLU_NO_ERROR; |
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| 123 | } |
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| 124 | |||
| 125 | /* prepare the knot information structures */ |
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| 126 | static GLenum |
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| 127 | fill_knot_structures(GLUnurbsObj * nobj, knot_str_type * geom_knot, |
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| 128 | knot_str_type * color_knot, knot_str_type * normal_knot, |
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| 129 | knot_str_type * texture_knot) |
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| 130 | { |
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| 131 | GLint order; |
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| 132 | GLfloat *knot; |
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| 133 | GLint nknots; |
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| 134 | GLint t_min, t_max; |
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| 135 | |||
| 136 | geom_knot->unified_knot = NULL; |
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| 137 | knot = geom_knot->knot = nobj->curve.geom.knot; |
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| 138 | nknots = geom_knot->nknots = nobj->curve.geom.knot_count; |
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| 139 | order = geom_knot->order = nobj->curve.geom.order; |
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| 140 | geom_knot->delta_nknots = 0; |
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| 141 | t_min = geom_knot->t_min = order - 1; |
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| 142 | t_max = geom_knot->t_max = nknots - order; |
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| 143 | if (fabs(knot[t_min] - knot[t_max]) < EPSILON) { |
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| 144 | call_user_error(nobj, GLU_NURBS_ERROR3); |
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| 145 | return GLU_ERROR; |
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| 146 | } |
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| 147 | if (fabs(knot[0] - knot[t_min]) < EPSILON) { |
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| 148 | /* knot open at beggining */ |
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| 149 | geom_knot->open_at_begin = GL_TRUE; |
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| 150 | } |
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| 151 | else |
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| 152 | geom_knot->open_at_begin = GL_FALSE; |
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| 153 | if (fabs(knot[t_max] - knot[nknots - 1]) < EPSILON) { |
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| 154 | /* knot open at end */ |
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| 155 | geom_knot->open_at_end = GL_TRUE; |
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| 156 | } |
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| 157 | else |
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| 158 | geom_knot->open_at_end = GL_FALSE; |
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| 159 | if (nobj->curve.color.type != GLU_INVALID_ENUM) { |
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| 160 | color_knot->unified_knot = (GLfloat *) 1; |
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| 161 | knot = color_knot->knot = nobj->curve.color.knot; |
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| 162 | nknots = color_knot->nknots = nobj->curve.color.knot_count; |
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| 163 | order = color_knot->order = nobj->curve.color.order; |
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| 164 | color_knot->delta_nknots = 0; |
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| 165 | t_min = color_knot->t_min = order - 1; |
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| 166 | t_max = color_knot->t_max = nknots - order; |
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| 167 | if (fabs(knot[t_min] - knot[t_max]) < EPSILON) { |
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| 168 | call_user_error(nobj, GLU_NURBS_ERROR3); |
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| 169 | return GLU_ERROR; |
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| 170 | } |
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| 171 | if (fabs(knot[0] - knot[t_min]) < EPSILON) { |
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| 172 | /* knot open at beggining */ |
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| 173 | color_knot->open_at_begin = GL_TRUE; |
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| 174 | } |
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| 175 | else |
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| 176 | color_knot->open_at_begin = GL_FALSE; |
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| 177 | if (fabs(knot[t_max] - knot[nknots - 1]) < EPSILON) { |
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| 178 | /* knot open at end */ |
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| 179 | color_knot->open_at_end = GL_TRUE; |
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| 180 | } |
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| 181 | else |
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| 182 | color_knot->open_at_end = GL_FALSE; |
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| 183 | } |
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| 184 | else |
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| 185 | color_knot->unified_knot = NULL; |
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| 186 | if (nobj->curve.normal.type != GLU_INVALID_ENUM) { |
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| 187 | normal_knot->unified_knot = (GLfloat *) 1; |
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| 188 | knot = normal_knot->knot = nobj->curve.normal.knot; |
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| 189 | nknots = normal_knot->nknots = nobj->curve.normal.knot_count; |
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| 190 | order = normal_knot->order = nobj->curve.normal.order; |
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| 191 | normal_knot->delta_nknots = 0; |
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| 192 | t_min = normal_knot->t_min = order - 1; |
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| 193 | t_max = normal_knot->t_max = nknots - order; |
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| 194 | if (fabs(knot[t_min] - knot[t_max]) < EPSILON) { |
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| 195 | call_user_error(nobj, GLU_NURBS_ERROR3); |
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| 196 | return GLU_ERROR; |
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| 197 | } |
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| 198 | if (fabs(knot[0] - knot[t_min]) < EPSILON) { |
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| 199 | /* knot open at beggining */ |
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| 200 | normal_knot->open_at_begin = GL_TRUE; |
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| 201 | } |
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| 202 | else |
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| 203 | normal_knot->open_at_begin = GL_FALSE; |
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| 204 | if (fabs(knot[t_max] - knot[nknots - 1]) < EPSILON) { |
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| 205 | /* knot open at end */ |
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| 206 | normal_knot->open_at_end = GL_TRUE; |
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| 207 | } |
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| 208 | else |
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| 209 | normal_knot->open_at_end = GL_FALSE; |
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| 210 | } |
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| 211 | else |
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| 212 | normal_knot->unified_knot = NULL; |
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| 213 | if (nobj->curve.texture.type != GLU_INVALID_ENUM) { |
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| 214 | texture_knot->unified_knot = (GLfloat *) 1; |
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| 215 | knot = texture_knot->knot = nobj->curve.texture.knot; |
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| 216 | nknots = texture_knot->nknots = nobj->curve.texture.knot_count; |
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| 217 | order = texture_knot->order = nobj->curve.texture.order; |
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| 218 | texture_knot->delta_nknots = 0; |
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| 219 | t_min = texture_knot->t_min = order - 1; |
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| 220 | t_max = texture_knot->t_max = nknots - order; |
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| 221 | if (fabs(knot[t_min] - knot[t_max]) < EPSILON) { |
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| 222 | call_user_error(nobj, GLU_NURBS_ERROR3); |
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| 223 | return GLU_ERROR; |
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| 224 | } |
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| 225 | if (fabs(knot[0] - knot[t_min]) < EPSILON) { |
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| 226 | /* knot open at beggining */ |
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| 227 | texture_knot->open_at_begin = GL_TRUE; |
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| 228 | } |
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| 229 | else |
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| 230 | texture_knot->open_at_begin = GL_FALSE; |
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| 231 | if (fabs(knot[t_max] - knot[nknots - 1]) < EPSILON) { |
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| 232 | /* knot open at end */ |
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| 233 | texture_knot->open_at_end = GL_TRUE; |
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| 234 | } |
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| 235 | else |
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| 236 | texture_knot->open_at_end = GL_FALSE; |
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| 237 | } |
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| 238 | else |
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| 239 | texture_knot->unified_knot = NULL; |
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| 240 | return GLU_NO_ERROR; |
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| 241 | } |
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| 242 | |||
| 243 | /* covert the NURBS curve into a series of adjacent Bezier curves */ |
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| 244 | static GLenum |
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| 245 | convert_curve(knot_str_type * the_knot, curve_attribs * attrib, |
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| 246 | GLfloat ** new_ctrl, GLint * ncontrol) |
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| 247 | { |
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| 248 | GLenum err; |
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| 249 | |||
| 250 | if ((err = explode_knot(the_knot)) != GLU_NO_ERROR) { |
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| 251 | if (the_knot->unified_knot) { |
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| 252 | free(the_knot->unified_knot); |
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| 253 | the_knot->unified_knot = NULL; |
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| 254 | } |
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| 255 | return err; |
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| 256 | } |
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| 257 | if (the_knot->unified_knot) { |
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| 258 | free(the_knot->unified_knot); |
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| 259 | the_knot->unified_knot = NULL; |
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| 260 | } |
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| 261 | if ((err = calc_alphas(the_knot)) != GLU_NO_ERROR) { |
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| 262 | free(the_knot->new_knot); |
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| 263 | return err; |
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| 264 | } |
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| 265 | free(the_knot->new_knot); |
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| 266 | if ((err = calc_new_ctrl_pts(attrib->ctrlarray, attrib->stride, the_knot, |
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| 267 | attrib->dim, new_ctrl, ncontrol)) |
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| 268 | != GLU_NO_ERROR) { |
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| 269 | free(the_knot->alpha); |
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| 270 | return err; |
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| 271 | } |
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| 272 | free(the_knot->alpha); |
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| 273 | return GLU_NO_ERROR; |
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| 274 | } |
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| 275 | |||
| 276 | /* covert curves - geometry and possible attribute ones into equivalent */ |
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| 277 | /* sequence of adjacent Bezier curves */ |
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| 278 | static GLenum |
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| 279 | convert_curves(GLUnurbsObj * nobj, GLfloat ** new_geom_ctrl, |
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| 280 | GLint * ncontrol, GLfloat ** new_color_ctrl, |
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| 281 | GLfloat ** new_normal_ctrl, GLfloat ** new_texture_ctrl) |
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| 282 | { |
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| 283 | knot_str_type geom_knot, color_knot, normal_knot, texture_knot; |
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| 284 | GLint junk; |
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| 285 | GLenum err; |
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| 286 | |||
| 287 | *new_color_ctrl = *new_normal_ctrl = *new_texture_ctrl = NULL; |
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| 288 | |||
| 289 | if (fill_knot_structures(nobj, &geom_knot, &color_knot, &normal_knot, |
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| 290 | &texture_knot) != GLU_NO_ERROR) |
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| 291 | return GLU_ERROR; |
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| 292 | |||
| 293 | /* unify knots - all knots should have the same number of working */ |
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| 294 | /* ranges */ |
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| 295 | if ( |
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| 296 | (err = |
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| 297 | select_knot_working_range(nobj, &geom_knot, &color_knot, &normal_knot, |
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| 298 | &texture_knot)) != GLU_NO_ERROR) { |
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| 299 | return err; |
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| 300 | } |
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| 301 | /* convert the geometry curve */ |
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| 302 | nobj->curve.geom.dim = get_curve_dim(nobj->curve.geom.type); |
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| 303 | if ((err = convert_curve(&geom_knot, &(nobj->curve.geom), new_geom_ctrl, |
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| 304 | ncontrol)) != GLU_NO_ERROR) { |
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| 305 | free_unified_knots(&geom_knot, &color_knot, &normal_knot, |
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| 306 | &texture_knot); |
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| 307 | call_user_error(nobj, err); |
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| 308 | return err; |
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| 309 | } |
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| 310 | /* if additional attributive curves are given convert them as well */ |
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| 311 | if (color_knot.unified_knot) { |
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| 312 | nobj->curve.color.dim = get_curve_dim(nobj->curve.color.type); |
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| 313 | if ((err = convert_curve(&color_knot, &(nobj->curve.color), |
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| 314 | new_color_ctrl, &junk)) != GLU_NO_ERROR) { |
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| 315 | free_unified_knots(&geom_knot, &color_knot, &normal_knot, |
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| 316 | &texture_knot); |
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| 317 | free(*new_geom_ctrl); |
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| 318 | call_user_error(nobj, err); |
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| 319 | return err; |
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| 320 | } |
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| 321 | } |
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| 322 | if (normal_knot.unified_knot) { |
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| 323 | nobj->curve.normal.dim = get_curve_dim(nobj->curve.normal.type); |
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| 324 | if ((err = convert_curve(&normal_knot, &(nobj->curve.normal), |
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| 325 | new_normal_ctrl, &junk)) != GLU_NO_ERROR) { |
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| 326 | free_unified_knots(&geom_knot, &color_knot, &normal_knot, |
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| 327 | &texture_knot); |
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| 328 | free(*new_geom_ctrl); |
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| 329 | if (*new_color_ctrl) |
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| 330 | free(*new_color_ctrl); |
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| 331 | call_user_error(nobj, err); |
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| 332 | return err; |
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| 333 | } |
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| 334 | } |
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| 335 | if (texture_knot.unified_knot) { |
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| 336 | nobj->curve.texture.dim = get_curve_dim(nobj->curve.texture.type); |
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| 337 | if ((err = convert_curve(&texture_knot, &(nobj->curve.texture), |
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| 338 | new_texture_ctrl, &junk)) != GLU_NO_ERROR) { |
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| 339 | free_unified_knots(&geom_knot, &color_knot, &normal_knot, |
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| 340 | &texture_knot); |
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| 341 | free(*new_geom_ctrl); |
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| 342 | if (*new_color_ctrl) |
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| 343 | free(*new_color_ctrl); |
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| 344 | if (*new_normal_ctrl) |
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| 345 | free(*new_normal_ctrl); |
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| 346 | call_user_error(nobj, err); |
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| 347 | return err; |
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| 348 | } |
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| 349 | } |
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| 350 | return GLU_NO_ERROR; |
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| 351 | } |
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| 352 | |||
| 353 | /* main NURBS curve procedure */ |
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| 354 | void |
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| 355 | do_nurbs_curve(GLUnurbsObj * nobj) |
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| 356 | { |
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| 357 | GLint geom_order, color_order = 0, normal_order = 0, texture_order = 0; |
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| 358 | GLenum geom_type; |
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| 359 | GLint n_ctrl; |
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| 360 | GLfloat *new_geom_ctrl, *new_color_ctrl, *new_normal_ctrl, |
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| 361 | *new_texture_ctrl; |
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| 362 | GLfloat *geom_ctrl = 0, *color_ctrl = 0, *normal_ctrl = 0, *texture_ctrl = 0; |
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| 363 | GLint *factors; |
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| 364 | GLint i, j; |
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| 365 | GLint geom_dim, color_dim = 0, normal_dim = 0, texture_dim = 0; |
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| 366 | |||
| 367 | /* test the user supplied data */ |
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| 368 | if (test_nurbs_curves(nobj) != GLU_NO_ERROR) |
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| 369 | return; |
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| 370 | |||
| 371 | if (convert_curves(nobj, &new_geom_ctrl, &n_ctrl, &new_color_ctrl, |
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| 372 | &new_normal_ctrl, &new_texture_ctrl) != GLU_NO_ERROR) |
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| 373 | return; |
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| 374 | |||
| 375 | geom_order = nobj->curve.geom.order; |
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| 376 | geom_type = nobj->curve.geom.type; |
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| 377 | geom_dim = nobj->curve.geom.dim; |
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| 378 | |||
| 379 | if (glu_do_sampling_crv(nobj, new_geom_ctrl, n_ctrl, geom_order, geom_dim, |
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| 380 | &factors) != GLU_NO_ERROR) { |
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| 381 | free(new_geom_ctrl); |
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| 382 | if (new_color_ctrl) |
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| 383 | free(new_color_ctrl); |
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| 384 | if (new_normal_ctrl) |
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| 385 | free(new_normal_ctrl); |
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| 386 | if (new_texture_ctrl) |
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| 387 | free(new_texture_ctrl); |
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| 388 | return; |
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| 389 | } |
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| 390 | glEnable(geom_type); |
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| 391 | if (new_color_ctrl) { |
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| 392 | glEnable(nobj->curve.color.type); |
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| 393 | color_dim = nobj->curve.color.dim; |
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| 394 | color_ctrl = new_color_ctrl; |
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| 395 | color_order = nobj->curve.color.order; |
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| 396 | } |
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| 397 | if (new_normal_ctrl) { |
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| 398 | glEnable(nobj->curve.normal.type); |
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| 399 | normal_dim = nobj->curve.normal.dim; |
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| 400 | normal_ctrl = new_normal_ctrl; |
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| 401 | normal_order = nobj->curve.normal.order; |
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| 402 | } |
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| 403 | if (new_texture_ctrl) { |
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| 404 | glEnable(nobj->curve.texture.type); |
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| 405 | texture_dim = nobj->curve.texture.dim; |
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| 406 | texture_ctrl = new_texture_ctrl; |
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| 407 | texture_order = nobj->curve.texture.order; |
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| 408 | } |
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| 409 | for (i = 0, j = 0, geom_ctrl = new_geom_ctrl; |
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| 410 | i < n_ctrl; i += geom_order, j++, geom_ctrl += geom_order * geom_dim) { |
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| 411 | if (fine_culling_test_2D |
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| 412 | (nobj, geom_ctrl, geom_order, geom_dim, geom_dim)) { |
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| 413 | color_ctrl += color_order * color_dim; |
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| 414 | normal_ctrl += normal_order * normal_dim; |
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| 415 | texture_ctrl += texture_order * texture_dim; |
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| 416 | continue; |
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| 417 | } |
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| 418 | glMap1f(geom_type, 0.0, 1.0, geom_dim, geom_order, geom_ctrl); |
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| 419 | if (new_color_ctrl) { |
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| 420 | glMap1f(nobj->curve.color.type, 0.0, 1.0, color_dim, |
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| 421 | color_order, color_ctrl); |
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| 422 | color_ctrl += color_order * color_dim; |
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| 423 | } |
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| 424 | if (new_normal_ctrl) { |
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| 425 | glMap1f(nobj->curve.normal.type, 0.0, 1.0, normal_dim, |
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| 426 | normal_order, normal_ctrl); |
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| 427 | normal_ctrl += normal_order * normal_dim; |
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| 428 | } |
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| 429 | if (new_texture_ctrl) { |
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| 430 | glMap1f(nobj->curve.texture.type, 0.0, 1.0, texture_dim, |
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| 431 | texture_order, texture_ctrl); |
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| 432 | texture_ctrl += texture_order * texture_dim; |
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| 433 | } |
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| 434 | glMapGrid1f(factors[j], 0.0, 1.0); |
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| 435 | glEvalMesh1(GL_LINE, 0, factors[j]); |
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| 436 | } |
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| 437 | free(new_geom_ctrl); |
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| 438 | free(factors); |
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| 439 | if (new_color_ctrl) |
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| 440 | free(new_color_ctrl); |
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| 441 | if (new_normal_ctrl) |
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| 442 | free(new_normal_ctrl); |
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| 443 | if (new_texture_ctrl) |
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| 444 | free(new_texture_ctrl); |
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| 445 | } |