source/render/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 public:
  20         using Scene::Loader;
  21
  22 private:
  23         struct OccludedRenderable
  24         {
  25                 Renderable *renderable;
  26                 const Geometry::BoundingSphere<float, 3> *bounding_sphere;
  27                 bool in_frustum;
  28                 bool occluder;
  29                 unsigned query;
  30
  31                 OccludedRenderable();
  32         };
  33
  34         typedef std::set<Renderable *> RenderableSet;
  35         typedef std::vector<OccludedRenderable> OccludedArray;
  36
  37         const Mesh &bounding_mesh;
  38         const Program &bounding_shader;
  39         RenderableSet renderables;
  40         float occluder_min_size;
  41         mutable OccludedArray occluded_cache;
  42         mutable bool cache_dirty;
  43
  44 public:
  45         OccludedScene(Resources &);
  46         ~OccludedScene();
  47
  48         virtual void add(Renderable &);
  49         virtual void remove(Renderable &);
  50
  51 private:
  52         void populate_cache() const;
  53
  54 public:
  55         virtual void setup_frame(Renderer &);
  56         virtual void finish_frame();
  57
  58         virtual void render(Renderer &, Tag = Tag()) const;
  59 };
  60
  61 } // namespace GL
  62 } // namespace Msp
  63
  64 #endif