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 "Camera.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                 case 1:
  49                         octant.init(Vector3(mid[0], min[1], mid[2]),
  50                                                 Vector3(max[0], mid[1], max[2]));
  51                         break;
  52                 case 2:
  53                         octant.init(mid, max);
  54                         break;
  55                 case 3:
  56                         octant.init(Vector3(min[0], mid[1], mid[2]),
  57                                                 Vector3(mid[0], max[1], max[2]));
  58                         break;
  59                 case 4:
  60                         octant.init(min, mid);
  61                         break;
  62                 case 5:
  63                         octant.init(Vector3(mid[0], min[1], min[2]),
  64                                                 Vector3(max[0], mid[1], mid[2]));
  65                         break;
  66                 case 6:
  67                         octant.init(Vector3(mid[0], mid[1], min[2]),
  68                                                 Vector3(max[0], max[1], mid[2]));
  69                         break;
  70                 case 7:
  71                         octant.init(Vector3(min[0], mid[1], min[2]),
  72                                                 Vector3(mid[0], max[1], mid[2]));
  73                         break;
  74         }
  75 }
  76
  77
  78 void Aabb::getCorners(Vector3 corners[8]) const
  79 {
  80         corners[0][0] = min[0]; corners[0][1] = min[1]; corners[0][2] = max[2];
  81         corners[1][0] = max[0]; corners[1][1] = min[1]; corners[1][2] = max[2];
  82         corners[2][0] = max[0]; corners[2][1] = max[1]; corners[2][2] = max[2];
  83         corners[3][0] = min[0]; corners[3][1] = max[1]; corners[3][2] = max[2];
  84         corners[4][0] = min[0]; corners[4][1] = min[1]; corners[4][2] = min[2];
  85         corners[5][0] = max[0]; corners[5][1] = min[1]; corners[5][2] = min[2];
  86         corners[6][0] = max[0]; corners[6][1] = max[1]; corners[6][2] = min[2];
  87         corners[7][0] = min[0]; corners[7][1] = max[1]; corners[7][2] = min[2];
  88 }
  89
  90
  91 void Aabb::encloseVertices(const Vector3 vertices[], unsigned count)
  92 {
  93         min = vertices[0];
  94         max = vertices[0];
  95
  96         for (unsigned i = 1; i < count; ++i)
  97         {
  98                 if (vertices[i][0] < min[0]) min[0] = vertices[i][0];
  99                 if (vertices[i][0] > max[0]) max[0] = vertices[i][0];
 100                 if (vertices[i][1] < min[1]) min[1] = vertices[i][1];
 101                 if (vertices[i][1] > max[1]) max[1] = vertices[i][1];
 102                 if (vertices[i][2] < min[2]) min[2] = vertices[i][2];
 103                 if (vertices[i][2] > max[2]) max[2] = vertices[i][2];
 104         }
 105 }
 106
 107
 108 void Aabb::draw(Scalar alpha) const
 109 {
 110         Scalar vertices[] = {min[0], min[1], min[2],
 111                                                  min[0], max[1], min[2],
 112                                                  max[0], max[1], min[2],
 113                                                  max[0], min[1], min[2],
 114                                                  min[0], max[1], max[2],
 115                                                  min[0], min[1], max[2],
 116                                                  max[0], min[1], max[2],
 117                                                  max[0], max[1], max[2]};
 118
 119         GLubyte indices[] = {0, 1, 2, 3,
 120                                                  1, 2, 7, 4,
 121                                                  3, 0, 5, 6,
 122                                                  2, 3, 6, 7,
 123                                                  5, 0, 1, 4,
 124                                                  4, 5, 6, 7};
 125
 126         glEnableClientState(GL_VERTEX_ARRAY);
 127         glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 128         glVertexPointer(3, GL_SCALAR, 0, vertices);
 129
 130         glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 131         Texture::resetBind();
 132
 133         glDrawElements(GL_QUADS, sizeof(indices), GL_UNSIGNED_BYTE, indices);
 134
 135         glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 136         //glDisableClientState(GL_VERTEX_ARRAY);
 137
 138         glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
 139 }
 140
 141 bool Aabb::isVisible(const Camera& cam) const
 142 {
 143         return cam.getFrustum().containsAabb(*this);
 144 }
 145
 146
 147 } // namespace Mf
 148
 149 /** vim: set ts=4 sw=4 tw=80: *************************************************/
 150