Dogcows Code - chaz/yoink/blob - src/moof/aabb.hh

   1
   2 /*]  Copyright (c) 2009-2010, Charles McGarvey  [**************************
   3 **]  All rights reserved.
   4 *
   5 * vi:ts=4 sw=4 tw=75
   6 *
   7 * Distributable under the terms and conditions of the 2-clause BSD license;
   8 * see the file COPYING for a complete text of the license.
   9 *
  10 **************************************************************************/
  11
  12 #ifndef _MOOF_AABB_HH_
  13 #define _MOOF_AABB_HH_
  14
  15 /**
  16  * \file aabb.hh
  17  * Axis-aligned Bounding Box
  18  */
  19
  20 #include <moof/cullable.hh>
  21 #include <moof/drawable.hh>
  22 #include <moof/math.hh>
  23 #include <moof/plane.hh>
  24 #include <moof/shape.hh>
  25
  26 #include <moof/frustum.hh>              // FIXME: this file is quite broken
  27 #include <moof/opengl.hh>
  28 #include <moof/texture.hh>
  29
  30
  31 namespace moof {
  32
  33
  34 class script;
  35
  36
  37 template <int D = 3>
  38 struct aabb : public cullable, public drawable, public shape<D>
  39 {
  40         typedef moof::vector< scalar, fixed<D> > vector;
  41
  42         vector min;
  43         vector max;
  44
  45
  46         aabb() {}
  47
  48         aabb(const vector& a, const vector& b)
  49         {
  50                 init(a, b);
  51         }
  52
  53         aabb(scalar x1, scalar y1, scalar x2, scalar y2)
  54         {
  55                 vector a(x1, y1);
  56                 vector b(x2, y2);
  57
  58                 init(a, b);
  59         }
  60
  61         aabb(scalar x1, scalar y1, scalar z1, scalar x2, scalar y2, scalar z2)
  62         {
  63                 vector a(x1, y1, z1);
  64                 vector b(x2, y2, z2);
  65
  66                 init(a, b);
  67         }
  68
  69
  70         void init(const vector2& a, const vector2& b)
  71         {
  72                 if (a[0] < b[0])
  73                 {
  74                         min[0] = a[0];
  75                         max[0] = b[0];
  76                 }
  77                 else
  78                 {
  79                         min[0] = b[0];
  80                         max[0] = a[0];
  81                 }
  82                 if (a[1] < b[1])
  83                 {
  84                         min[1] = a[1];
  85                         max[1] = b[1];
  86                 }
  87                 else
  88                 {
  89                         min[1] = b[1];
  90                         max[1] = a[1];
  91                 }
  92         }
  93
  94         void init(const vector3& a, const vector3& b)
  95         {
  96                 if (a[0] < b[0])
  97                 {
  98                         min[0] = a[0];
  99                         max[0] = b[0];
 100                 }
 101                 else
 102                 {
 103                         min[0] = b[0];
 104                         max[0] = a[0];
 105                 }
 106                 if (a[1] < b[1])
 107                 {
 108                         min[1] = a[1];
 109                         max[1] = b[1];
 110                 }
 111                 else
 112                 {
 113                         min[1] = b[1];
 114                         max[1] = a[1];
 115                 }
 116                 if (a[2] < b[2])
 117                 {
 118                         min[2] = a[2];
 119                         max[2] = b[2];
 120                 }
 121                 else
 122                 {
 123                         min[2] = b[2];
 124                         max[2] = a[2];
 125                 }
 126         }
 127
 128
 129         vector center() const
 130         {
 131                 return (min + max) / 2.0;
 132         }
 133
 134
 135         plane xy_plane() const
 136         {
 137                 plane plane;
 138                 plane.normal = vector3(0.0, 0.0, 1.0);
 139                 plane.d = dot(-plane.normal, center());
 140                 return plane;
 141         }
 142
 143         plane xz_plane() const
 144         {
 145                 plane plane;
 146                 plane.normal = vector3(0.0, 1.0, 0.0);
 147                 plane.d = dot(-plane.normal, center());
 148                 return plane;
 149         }
 150
 151         plane yz_plane() const
 152         {
 153                 plane plane;
 154                 plane.normal = vector3(1.0, 0.0, 0.0);
 155                 plane.d = dot(-plane.normal, center());
 156                 return plane;
 157         }
 158
 159
 160         void get_corners(vector2 corners[4]) const
 161         {
 162                 corners[0][0] = min[0]; corners[0][1] = min[1];
 163                 corners[1][0] = max[0]; corners[1][1] = min[1];
 164                 corners[2][0] = max[0]; corners[2][1] = max[1];
 165                 corners[3][0] = min[0]; corners[3][1] = max[1];
 166         }
 167
 168         void get_corners(vector3 corners[8]) const
 169         {
 170                 corners[0][0] = min[0];
 171                 corners[0][1] = min[1];
 172                 corners[0][2] = max[2];
 173                 corners[1][0] = max[0];
 174                 corners[1][1] = min[1];
 175                 corners[1][2] = max[2];
 176                 corners[2][0] = max[0];
 177                 corners[2][1] = max[1];
 178                 corners[2][2] = max[2];
 179                 corners[3][0] = min[0];
 180                 corners[3][1] = max[1];
 181                 corners[3][2] = max[2];
 182                 corners[4][0] = min[0];
 183                 corners[4][1] = min[1];
 184                 corners[4][2] = min[2];
 185                 corners[5][0] = max[0];
 186                 corners[5][1] = min[1];
 187                 corners[5][2] = min[2];
 188                 corners[6][0] = max[0];
 189                 corners[6][1] = max[1];
 190                 corners[6][2] = min[2];
 191                 corners[7][0] = min[0];
 192                 corners[7][1] = max[1];
 193                 corners[7][2] = min[2];
 194         }
 195
 196
 197         void enclose_vertices(const vector vertices[], unsigned count)
 198         {
 199                 min.zero();
 200                 max.zero();
 201
 202                 for (unsigned i = 1; i < count; ++i)
 203                 {
 204                         min.minimize(vertices[i]);
 205                         max.maximize(vertices[i]);
 206                 }
 207         }
 208
 209
 210         void draw(scalar alpha = 0.0) const
 211         {
 212                 glRect(min[0], min[1], max[0], max[1]);
 213         }
 214
 215         bool is_visible(const frustum& frustum) const
 216         {
 217                 return true;
 218         }
 219 };
 220
 221
 222 void import_aabb_class(script& script);
 223
 224 template <>
 225 inline void aabb<3>::draw(scalar alpha) const
 226 {
 227         scalar vertices[] = {min[0], min[1], min[2],
 228                                                  min[0], max[1], min[2],
 229                                                  max[0], max[1], min[2],
 230                                                  max[0], min[1], min[2],
 231                                                  min[0], max[1], max[2],
 232                                                  min[0], min[1], max[2],
 233                                                  max[0], min[1], max[2],
 234                                                  max[0], max[1], max[2]};
 235
 236         GLubyte indices[] = {0, 1, 2, 3,
 237                                                  1, 2, 7, 4,
 238                                                  3, 0, 5, 6,
 239                                                  2, 3, 6, 7,
 240                                                  5, 0, 1, 4,
 241                                                  4, 5, 6, 7};
 242
 243         glEnableClientState(GL_VERTEX_ARRAY);
 244         glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 245         glVertexPointer(3, GL_SCALAR, 0, vertices);
 246
 247         glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 248         texture::reset_binding();
 249
 250         glDrawElements(GL_QUADS, sizeof(indices), GL_UNSIGNED_BYTE,
 251                                    indices);
 252
 253         glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 254         //glDisableClientState(GL_VERTEX_ARRAY);
 255
 256         glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
 257 }
 258
 259 template <>
 260 inline bool aabb<3>::is_visible(const frustum& frustum) const
 261 {
 262         return frustum.contains(*this);
 263 }
 264
 265
 266 typedef aabb<2>         aabb2;
 267 typedef aabb2           rectangle;
 268 typedef aabb<3>         aabb3;
 269
 270
 271 } // namespace moof
 272
 273 #endif // _MOOF_AABB_HH_
 274