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