Dogcows Code - chaz/yoink/blob - src/Moof/Octree.hh

   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 #ifndef _MOOF_OCTREE_HH_
  30 #define _MOOF_OCTREE_HH_
  31
  32 #include <algorithm>
  33 #include <list>
  34
  35 #include <boost/shared_ptr.hpp>
  36
  37 #include <stlplus/ntree.hpp>
  38
  39 #include <Moof/Aabb.hh>
  40 #include <Moof/Drawable.hh>
  41 #include <Moof/Entity.hh>
  42 #include <Moof/Math.hh>
  43 #include <Moof/Sphere.hh>
  44
  45
  46 namespace Mf {
  47
  48
  49 class Camera;
  50
  51
  52 struct OctreeNode : public Entity
  53 {
  54         std::list<EntityPtr> objects;
  55
  56         OctreeNode()
  57         {
  58                 aabb_.min = Vector3(-1.0, -1.0, -1.0);
  59                 aabb_.max = Vector3(1.0, 1.0, 1.0);
  60                 sphere_.init(Vector3(0.0, 0.0, 0.0), 1.41421);
  61         }
  62
  63         OctreeNode(const Aabb& aabb)
  64         {
  65                 aabb_ = aabb;
  66                 sphere_.point = aabb.getCenter();
  67                 sphere_.radius = (aabb.min - sphere_.point).length();
  68         }
  69
  70         void draw(Scalar alpha) const
  71         {
  72                 std::list<EntityPtr>::const_iterator it;
  73
  74                 for (it = objects.begin(); it != objects.end(); ++it)
  75                 {
  76                         (*it)->draw(alpha);
  77                 }
  78
  79                 //if (!objects.empty())
  80                         //aabb_.draw(); // temporary
  81         }
  82
  83         void drawIfVisible(Scalar alpha, const Camera& cam) const
  84         {
  85                 std::list<EntityPtr>::const_iterator it;
  86
  87                 for (it = objects.begin(); it != objects.end(); ++it)
  88                 {
  89                         (*it)->drawIfVisible(alpha, cam);
  90                 }
  91
  92                 //if (!objects.empty())
  93                         //aabb_.draw();
  94         }
  95
  96
  97         bool isVisible(const Camera& cam) const
  98         {
  99                 if (sphere_.isVisible(cam))
 100                 {
 101                         return aabb_.isVisible(cam);
 102                 }
 103
 104                 return false;
 105         }
 106
 107
 108         static bool compareZOrder(EntityPtr a, EntityPtr b)
 109         {
 110                 return a->getSphere().point[2] < b->getSphere().point[2];
 111         }
 112
 113         void sort()
 114         {
 115                 //std::sort(objects.begin(), objects.end(), compareZOrder);
 116                 objects.sort(compareZOrder);
 117         }
 118 };
 119
 120
 121 class Octree
 122 {
 123 public:
 124
 125         explicit Octree(const OctreeNode& rootNode)
 126         {
 127                 tree_.insert(rootNode);
 128         }
 129
 130         stlplus::ntree<OctreeNode>::iterator insert(EntityPtr entity)
 131         {
 132                 return insert(tree_.root(), entity);
 133         }
 134
 135         stlplus::ntree<OctreeNode>::iterator reinsert(EntityPtr entity,
 136                         stlplus::ntree<OctreeNode>::iterator node);
 137
 138         void drawIfVisible(Scalar alpha, const Camera& cam)
 139         {
 140                 drawIfVisible(tree_.root(), alpha, cam);
 141         }
 142
 143         void sort();
 144
 145 private:
 146         stlplus::ntree<OctreeNode>::iterator insert(stlplus::ntree<OctreeNode>::iterator node, EntityPtr entity);
 147
 148         void addChild(stlplus::ntree<OctreeNode>::iterator node, int index);
 149
 150         void draw(stlplus::ntree<OctreeNode>::iterator node, Scalar alpha);
 151         void drawIfVisible(stlplus::ntree<OctreeNode>::iterator node,
 152                         Scalar alpha, const Camera& cam);
 153
 154         stlplus::ntree<OctreeNode> tree_;
 155 };
 156
 157 typedef boost::shared_ptr<Octree> OctreePtr;
 158
 159
 160 } // namespace Mf
 161
 162 #endif // _MOOF_OCTREE_HH_
 163
 164 /** vim: set ts=4 sw=4 tw=80: *************************************************/
 165