source/render/scene.cpp

   1 #include <msp/datafile/collection.h>
   2 #include <msp/fs/utils.h>
   3 #include <msp/strings/format.h>
   4 #include "camera.h"
   5 #include "objectinstance.h"
   6 #include "occludedscene.h"
   7 #include "orderedscene.h"
   8 #include "renderer.h"
   9 #include "scene.h"
  10 #include "simplescene.h"
  11 #include "zsortedscene.h"
  12
  13 using namespace std;
  14
  15 namespace Msp {
  16 namespace GL {
  17
  18 bool Scene::setup_frustum(const Renderer &renderer) const
  19 {
  20         const Camera *camera = renderer.get_camera();
  21         if(!camera)
  22                 return false;
  23
  24         culling_matrix = camera->get_view_matrix()*renderer.get_matrix();
  25
  26         if(camera->is_orthographic())
  27         {
  28                 float h = camera->get_orthographic_height();
  29                 frustum_edges[0] = Vector4(0, 1, 0, -h);
  30                 frustum_edges[1] = Vector4(0, -1, 0, -h);
  31
  32                 float w = camera->get_orthographic_width();
  33                 frustum_edges[2] = Vector4(1, 0, 0, -w);
  34                 frustum_edges[3] = Vector4(-1, 0, 0, -w);
  35         }
  36         else
  37         {
  38                 float y = tan(camera->get_field_of_view()/2.0f);
  39                 float s = sqrt(y*y+1);
  40                 frustum_edges[0] = Vector4(0, 1/s, y/s, 0);
  41                 frustum_edges[1] = Vector4(0, -1/s, y/s, 0);
  42
  43                 float x = y*camera->get_aspect_ratio();
  44                 s = sqrt(x*x+1);
  45                 frustum_edges[2] = Vector4(1/s, 0, x/s, 0);
  46                 frustum_edges[3] = Vector4(-1/s, 0, x/s, 0);
  47         }
  48
  49         frustum_edges[4] = Vector4(0, 0, -1, -camera->get_far_clip());
  50         frustum_edges[5] = Vector4(0, 0, 1, camera->get_near_clip());
  51
  52         return true;
  53 }
  54
  55 bool Scene::frustum_cull(const Renderable &renderable) const
  56 {
  57         const Matrix *matrix = renderable.get_matrix();
  58         const Geometry::BoundingSphere<float, 3> *bsphere = renderable.get_bounding_sphere();
  59         if(!matrix || !bsphere)
  60                 return false;
  61
  62         Vector4 center = culling_matrix*(*matrix*compose(bsphere->get_center(), 1.0f));
  63         Vector3 x_axis = (matrix->column(0)*bsphere->get_radius()).slice<3>(0);
  64         float radius_sq = inner_product(x_axis, x_axis);
  65
  66         for(unsigned i=0; i<6; ++i)
  67         {
  68                 float distance = inner_product(center, frustum_edges[i]);
  69                 if(distance>0 && distance*distance>radius_sq)
  70                         return true;
  71         }
  72
  73         return false;
  74 }
  75
  76 Scene::GenericLoader::TypeRegistry &Scene::get_scene_registry()
  77 {
  78         static Scene::GenericLoader::TypeRegistry registry;
  79         static bool initialized = false;
  80         if(!initialized)
  81         {
  82                 initialized = true;
  83                 register_type<SimpleScene>("simple");
  84                 register_type<ZSortedScene>("zsorted");
  85                 register_type<OrderedScene>("ordered");
  86                 register_type<OccludedScene>("occluded");
  87         }
  88         return registry;
  89 }
  90
  91
  92 Scene::Loader::Loader(Scene &s, Collection &c, ContentMap *m):
  93         DataFile::CollectionObjectLoader<Scene>(s, &c),
  94         content(m),
  95         inst_counter(0)
  96 {
  97         add("object", &Loader::object);
  98         add("object", &Loader::object_tagged);
  99         add("scene", &Loader::scene);
 100 }
 101
 102 void Scene::Loader::object(const string &n)
 103 {
 104         object_tagged(n, string());
 105 }
 106
 107 void Scene::Loader::object_tagged(const string &n, const string &t)
 108 {
 109         RefPtr<ObjectInstance> inst = new ObjectInstance(get_collection().get<GL::Object>(n));
 110         load_sub(*inst);
 111         get_collection().add(format("%s/%d.inst", FS::basename(get_source()), inst_counter++), inst.get());
 112         if(content && !t.empty())
 113                 (*content)[t] = inst.get();
 114         obj.add(*inst.release());
 115 }
 116
 117 void Scene::Loader::scene(const string &n)
 118 {
 119         obj.add(get_collection().get<Scene>(n));
 120 }
 121
 122 } // namespace GL
 123 } // namespace Msp