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