Dogcows Code - chaz/yoink/blob - src/Moof/Aabb.cc

   1
   2 /*******************************************************************************
   3
   4  Copyright (c) 2009, Charles McGarvey
   5  All rights reserved.
   6
   7  Redistribution   and   use  in  source  and  binary  forms,  with  or  without
   8  modification, are permitted provided that the following conditions are met:
   9
  10    * Redistributions  of  source  code  must retain the above copyright notice,
  11      this list of conditions and the following disclaimer.
  12    * Redistributions  in binary form must reproduce the above copyright notice,
  13      this  list of conditions and the following disclaimer in the documentation
  14      and/or other materials provided with the distribution.
  15
  16  THIS  SOFTWARE  IS  PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  17  AND  ANY  EXPRESS  OR  IMPLIED  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  19  DISCLAIMED.  IN  NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  20  FOR  ANY  DIRECT,  INDIRECT,  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  DAMAGES  (INCLUDING,  BUT  NOT  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  22  SERVICES;  LOSS  OF  USE,  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  23  CAUSED  AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  24  OR  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  25  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26
  27 *******************************************************************************/
  28
  29 #include "Aabb.hh"
  30 #include "Frustum.hh"
  31 #include "OpenGL.hh"
  32 #include "Texture.hh"
  33
  34
  35 namespace Mf {
  36
  37
  38 void Aabb::getOctant(Aabb& octant, int num) const
  39 {
  40         Vector3 mid = getCenter();
  41
  42         switch (num)
  43         {
  44                 case 0:
  45                         octant.init(Vector3(min[0], min[1], mid[2]),
  46                                                 Vector3(mid[0], mid[1], max[2]));
  47                         break;
  48
  49                 case 1:
  50                         octant.init(Vector3(mid[0], min[1], mid[2]),
  51                                                 Vector3(max[0], mid[1], max[2]));
  52                         break;
  53
  54                 case 2:
  55                         octant.init(mid, max);
  56                         break;
  57
  58                 case 3:
  59                         octant.init(Vector3(min[0], mid[1], mid[2]),
  60                                                 Vector3(mid[0], max[1], max[2]));
  61                         break;
  62
  63                 case 4:
  64                         octant.init(min, mid);
  65                         break;
  66
  67                 case 5:
  68                         octant.init(Vector3(mid[0], min[1], min[2]),
  69                                                 Vector3(max[0], mid[1], mid[2]));
  70                         break;
  71
  72                 case 6:
  73                         octant.init(Vector3(mid[0], mid[1], min[2]),
  74                                                 Vector3(max[0], max[1], mid[2]));
  75                         break;
  76
  77                 case 7:
  78                         octant.init(Vector3(min[0], mid[1], min[2]),
  79                                                 Vector3(mid[0], max[1], mid[2]));
  80                         break;
  81         }
  82 }
  83
  84
  85 void Aabb::getCorners(Vector3 corners[8]) const
  86 {
  87         corners[0][0] = min[0]; corners[0][1] = min[1]; corners[0][2] = max[2];
  88         corners[1][0] = max[0]; corners[1][1] = min[1]; corners[1][2] = max[2];
  89         corners[2][0] = max[0]; corners[2][1] = max[1]; corners[2][2] = max[2];
  90         corners[3][0] = min[0]; corners[3][1] = max[1]; corners[3][2] = max[2];
  91         corners[4][0] = min[0]; corners[4][1] = min[1]; corners[4][2] = min[2];
  92         corners[5][0] = max[0]; corners[5][1] = min[1]; corners[5][2] = min[2];
  93         corners[6][0] = max[0]; corners[6][1] = max[1]; corners[6][2] = min[2];
  94         corners[7][0] = min[0]; corners[7][1] = max[1]; corners[7][2] = min[2];
  95 }
  96
  97
  98 void Aabb::encloseVertices(const Vector3 vertices[], unsigned count)
  99 {
 100         min = vertices[0];
 101         max = vertices[0];
 102
 103         for (unsigned i = 1; i < count; ++i)
 104         {
 105                 if (vertices[i][0] < min[0]) min[0] = vertices[i][0];
 106                 if (vertices[i][0] > max[0]) max[0] = vertices[i][0];
 107                 if (vertices[i][1] < min[1]) min[1] = vertices[i][1];
 108                 if (vertices[i][1] > max[1]) max[1] = vertices[i][1];
 109                 if (vertices[i][2] < min[2]) min[2] = vertices[i][2];
 110                 if (vertices[i][2] > max[2]) max[2] = vertices[i][2];
 111         }
 112 }
 113
 114
 115 void Aabb::draw(Scalar alpha) const
 116 {
 117         Scalar vertices[] = {min[0], min[1], min[2],
 118                                                  min[0], max[1], min[2],
 119                                                  max[0], max[1], min[2],
 120                                                  max[0], min[1], min[2],
 121                                                  min[0], max[1], max[2],
 122                                                  min[0], min[1], max[2],
 123                                                  max[0], min[1], max[2],
 124                                                  max[0], max[1], max[2]};
 125
 126         GLubyte indices[] = {0, 1, 2, 3,
 127                                                  1, 2, 7, 4,
 128                                                  3, 0, 5, 6,
 129                                                  2, 3, 6, 7,
 130                                                  5, 0, 1, 4,
 131                                                  4, 5, 6, 7};
 132
 133         glEnableClientState(GL_VERTEX_ARRAY);
 134         glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 135         glVertexPointer(3, GL_SCALAR, 0, vertices);
 136
 137         glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 138         Texture::resetBind();
 139
 140         glDrawElements(GL_QUADS, sizeof(indices), GL_UNSIGNED_BYTE, indices);
 141
 142         glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 143         //glDisableClientState(GL_VERTEX_ARRAY);
 144
 145         glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
 146 }
 147
 148 bool Aabb::isVisible(const Frustum& frustum) const
 149 {
 150         return frustum.contains(*this);
 151 }
 152
 153
 154 } // namespace Mf
 155
 156 /** vim: set ts=4 sw=4 tw=80: *************************************************/
 157