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 = 0;
  30                 const Geometry::BoundingSphere<float, 3> *bounding_sphere = 0;
  31                 bool in_frustum = false;
  32                 bool occluder = false;
  33         };
  34
  35         const Mesh &bounding_mesh;
  36         const Program &bounding_shader;
  37         Blend no_color_write;
  38         DepthTest no_depth_write = { LEQUAL, false };
  39         std::set<Renderable *> renderables;
  40         float occluder_min_size = 0.25f;
  41         mutable QueryPool queries;
  42         mutable std::vector<OccludedRenderable> occluded_cache;
  43         mutable bool cache_dirty = false;
  44
  45 public:
  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