source/occludedscene.h

   1 #ifndef MSP_GL_OCCLUDEDSCENE_H_
   2 #define MSP_GL_OCCLUDEDSCENE_H_
   3
   4 #include <set>
   5 #include <vector>
   6 #include "mesh.h"
   7 #include "program.h"
   8 #include "scene.h"
   9
  10 namespace Msp {
  11 namespace GL {
  12
  13 /**
  14 A scene that performs occlusion queries on renderables to skip those that are
  15 entirely occluded by others.
  16 */
  17 class OccludedScene: public Scene
  18 {
  19 private:
  20         struct OccludedRenderable
  21         {
  22                 Renderable *renderable;
  23                 const Geometry::BoundingSphere<float, 3> *bounding_sphere;
  24                 bool in_frustum;
  25                 bool occluder;
  26                 unsigned query;
  27
  28                 OccludedRenderable();
  29         };
  30
  31         typedef std::set<Renderable *> RenderableSet;
  32         typedef std::vector<OccludedRenderable> OccludedArray;
  33
  34         Mesh bounding_mesh;
  35         Program bounding_shader;
  36         RenderableSet renderables;
  37         float occluder_min_size;
  38         mutable OccludedArray occluded_cache;
  39         mutable bool cache_dirty;
  40
  41 public:
  42         OccludedScene();
  43         ~OccludedScene();
  44
  45         virtual void add(Renderable &);
  46         virtual void remove(Renderable &);
  47
  48 private:
  49         void populate_cache() const;
  50
  51 public:
  52         virtual void setup_frame(Renderer &);
  53         virtual void finish_frame();
  54
  55         virtual void render(Renderer &, const Tag & = Tag()) const;
  56 };
  57
  58 } // namespace GL
  59 } // namespace Msp
  60
  61 #endif