source/zsortedscene.cpp

   1 #include "camera.h"
   2 #include "renderer.h"
   3 #include "zsortedscene.h"
   4
   5 using namespace std;
   6
   7 namespace Msp {
   8 namespace GL {
   9
  10 ZSortedScene::ZSortedScene():
  11         order(BACK_TO_FRONT),
  12         reference(FURTHEST)
  13 { }
  14
  15 void ZSortedScene::add(Renderable &r)
  16 {
  17         if(renderables.insert(&r).second && !sorted_cache.empty())
  18                 sorted_cache.push_back(&r);
  19 }
  20
  21 void ZSortedScene::remove(Renderable &r)
  22 {
  23         renderables.erase(&r);
  24         sorted_cache.clear();
  25 }
  26
  27 void ZSortedScene::set_order(SortOrder o)
  28 {
  29         order = o;
  30 }
  31
  32 void ZSortedScene::set_reference(DepthReference r)
  33 {
  34         reference = r;
  35 }
  36
  37 void ZSortedScene::populate_cache() const
  38 {
  39         if(sorted_cache.empty() && !renderables.empty())
  40         {
  41                 sorted_cache.reserve(renderables.size());
  42                 sorted_cache.insert(sorted_cache.end(), renderables.begin(), renderables.end());
  43         }
  44 }
  45
  46 void ZSortedScene::setup_frame(Renderer &renderer)
  47 {
  48         populate_cache();
  49         for(SortedArray::const_iterator i=sorted_cache.begin(); i!=sorted_cache.end(); ++i)
  50                 i->renderable->setup_frame(renderer);
  51 }
  52
  53 void ZSortedScene::finish_frame()
  54 {
  55         for(SortedArray::const_iterator i=sorted_cache.begin(); i!=sorted_cache.end(); ++i)
  56                 i->renderable->finish_frame();
  57 }
  58
  59 void ZSortedScene::render(Renderer &renderer, const Tag &tag) const
  60 {
  61         if(renderables.empty())
  62                 return;
  63
  64         populate_cache();
  65
  66         const Camera *camera = renderer.get_camera();
  67         if(!camera)
  68         {
  69                 for(SortedArray::const_iterator i=sorted_cache.begin(); i!=sorted_cache.end(); ++i)
  70                         renderer.render(*i->renderable, tag);
  71                 return;
  72         }
  73
  74         const Vector3 &camera_pos = camera->get_position();
  75         const Vector3 &look_dir = camera->get_look_direction();
  76         float radius_factor = reference-1.0f;
  77         float sign = 1.0f-order*2.0f;
  78
  79         bool use_frustum = setup_frustum(renderer);
  80         for(SortedArray::iterator i=sorted_cache.begin(); i!=sorted_cache.end(); ++i)
  81         {
  82                 i->in_frustum = (!use_frustum || !frustum_cull(*i->renderable));
  83                 if(!i->in_frustum)
  84                         continue;
  85
  86                 if(const Matrix *matrix = i->renderable->get_matrix())
  87                 {
  88                         if(const Geometry::BoundingSphere<float, 3> *bsphere = i->renderable->get_bounding_sphere())
  89                                 i->depth = dot(*matrix*bsphere->get_center()-camera_pos, look_dir)+bsphere->get_radius()*radius_factor;
  90                         else
  91                                 i->depth = dot(*matrix*Vector3()-camera_pos, look_dir);
  92                         i->depth *= sign;
  93                 }
  94                 else
  95                         i->depth = 0;
  96         }
  97
  98         for(SortedArray::iterator i=sorted_cache.begin(), j=i; i!=sorted_cache.end(); ++i)
  99                 if(i->in_frustum)
 100                 {
 101                         if(i!=j)
 102                                 swap(*i, *j);
 103
 104                         if(j!=sorted_cache.begin() && *j<*(j-1))
 105                         {
 106                                 SortedRenderable sr = *j;
 107                                 SortedArray::iterator k = j-1;
 108                                 *j = *k;
 109                                 while(k!=sorted_cache.begin() && sr<*(k-1))
 110                                 {
 111                                         *k = *(k-1);
 112                                         --k;
 113                                 }
 114                                 *k = sr;
 115                         }
 116
 117                         ++j;
 118                 }
 119
 120         for(SortedArray::const_iterator i=sorted_cache.begin(); (i!=sorted_cache.end() && i->in_frustum); ++i)
 121                 renderer.render(*i->renderable, tag);
 122 }
 123
 124
 125 ZSortedScene::SortedRenderable::SortedRenderable(Renderable *r):
 126         renderable(r),
 127         in_frustum(false),
 128         depth(0.0f)
 129 { }
 130
 131 } // namespace GL
 132 } // namespace Msp