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 "blend.h"
   7 #include "depthtest.h"
   8 #include "mesh.h"
   9 #include "program.h"
  10 #include "query.h"
  11 #include "scene.h"
  12
  13 namespace Msp {
  14 namespace GL {
  15
  16 /**
  17 A scene that performs occlusion queries on renderables to skip those that are
  18 entirely occluded by others.
  19 */
  20 class OccludedScene: public Scene
  21 {
  22 public:
  23         using Scene::Loader;
  24
  25 private:
  26         struct OccludedRenderable
  27         {
  28                 Renderable *renderable;
  29                 const Geometry::BoundingSphere<float, 3> *bounding_sphere;
  30                 bool in_frustum;
  31                 bool occluder;
  32
  33                 OccludedRenderable();
  34         };
  35
  36         const Mesh &bounding_mesh;
  37         const Program &bounding_shader;
  38         Blend no_color_write;
  39         DepthTest no_depth_write;
  40         std::set<Renderable *> renderables;
  41         float occluder_min_size;
  42         mutable QueryPool queries;
  43         mutable std::vector<OccludedRenderable> occluded_cache;
  44         mutable bool cache_dirty;
  45
  46 public:
  47         OccludedScene();
  48
  49         virtual void add(Renderable &);
  50         virtual void remove(Renderable &);
  51
  52 private:
  53         void populate_cache() const;
  54
  55 public:
  56         virtual void setup_frame(Renderer &);
  57         virtual void finish_frame();
  58
  59         virtual void render(Renderer &, Tag = Tag()) const;
  60 };
  61
  62 } // namespace GL
  63 } // namespace Msp
  64
  65 #endif