source/render/scene.cpp

   1 #include <msp/datafile/collection.h>
   2 #include <msp/fs/utils.h>
   3 #include "camera.h"
   4 #include "objectinstance.h"
   5 #include "occludedscene.h"
   6 #include "orderedscene.h"
   7 #include "renderer.h"
   8 #include "scene.h"
   9 #include "simplescene.h"
  10 #include "zsortedscene.h"
  11
  12 using namespace std;
  13
  14 namespace Msp {
  15 namespace GL {
  16
  17 bool Scene::setup_frustum(const Renderer &renderer) const
  18 {
  19         const Camera *camera = renderer.get_camera();
  20         if(!camera)
  21                 return false;
  22
  23         culling_matrix = camera->get_view_matrix()*renderer.get_matrix();
  24
  25         if(camera->is_orthographic())
  26         {
  27                 float h = camera->get_orthographic_height();
  28                 frustum_edges[0] = Vector4(0, 1, 0, -h);
  29                 frustum_edges[1] = Vector4(0, -1, 0, -h);
  30
  31                 float w = camera->get_orthographic_width();
  32                 frustum_edges[2] = Vector4(1, 0, 0, -w);
  33                 frustum_edges[3] = Vector4(-1, 0, 0, -w);
  34         }
  35         else
  36         {
  37                 float y = tan(camera->get_field_of_view()/2.0f);
  38                 float s = sqrt(y*y+1);
  39                 frustum_edges[0] = Vector4(0, 1/s, y/s, 0);
  40                 frustum_edges[1] = Vector4(0, -1/s, y/s, 0);
  41
  42                 float x = y*camera->get_aspect_ratio();
  43                 s = sqrt(x*x+1);
  44                 frustum_edges[2] = Vector4(1/s, 0, x/s, 0);
  45                 frustum_edges[3] = Vector4(-1/s, 0, x/s, 0);
  46         }
  47
  48         frustum_edges[4] = Vector4(0, 0, -1, -camera->get_far_clip());
  49         frustum_edges[5] = Vector4(0, 0, 1, camera->get_near_clip());
  50
  51         return true;
  52 }
  53
  54 bool Scene::frustum_cull(const Renderable &renderable) const
  55 {
  56         const Matrix *matrix = renderable.get_matrix();
  57         const Geometry::BoundingSphere<float, 3> *bsphere = renderable.get_bounding_sphere();
  58         if(!matrix || !bsphere)
  59                 return false;
  60
  61         Vector4 center = culling_matrix*(*matrix*compose(bsphere->get_center(), 1.0f));
  62         Vector3 x_axis = (matrix->column(0)*bsphere->get_radius()).slice<3>(0);
  63         float radius_sq = inner_product(x_axis, x_axis);
  64
  65         for(unsigned i=0; i<6; ++i)
  66         {
  67                 float distance = inner_product(center, frustum_edges[i]);
  68                 if(distance>0 && distance*distance>radius_sq)
  69                         return true;
  70         }
  71
  72         return false;
  73 }
  74
  75 Scene::SceneRegistry &Scene::get_scene_registry()
  76 {
  77         static SceneRegistry registry;
  78         static bool initialized = false;
  79         if(!initialized)
  80         {
  81                 initialized = true;
  82                 register_type<SimpleScene>("simple");
  83                 register_type<ZSortedScene>("zsorted");
  84                 register_type<OrderedScene>("ordered");
  85                 register_type<OccludedScene>("occluded");
  86         }
  87         return registry;
  88 }
  89
  90
  91 Scene::Loader::Loader(Scene &s, Collection &c):
  92         DataFile::CollectionObjectLoader<Scene>(s, &c),
  93         content(0)
  94 {
  95         init();
  96 }
  97
  98 Scene::Loader::Loader(Scene &s, Collection &c, ContentMap &m):
  99         DataFile::CollectionObjectLoader<Scene>(s, &c),
 100         content(&m)
 101 {
 102         init();
 103 }
 104
 105 void Scene::Loader::init()
 106 {
 107         add("object", &Loader::object);
 108         add("object", &Loader::object_tagged);
 109         add("scene", &Loader::scene);
 110 }
 111
 112 void Scene::Loader::object(const string &n)
 113 {
 114         object_tagged(n, string());
 115 }
 116
 117 void Scene::Loader::object_tagged(const string &n, const string &t)
 118 {
 119         RefPtr<ObjectInstance> inst = new ObjectInstance(get_collection().get<GL::Object>(n));
 120         load_sub(*inst);
 121         get_collection().add(format("%s/%d.inst", FS::basename(get_source()), inst_counter++), inst.get());
 122         if(content && !t.empty())
 123                 (*content)[t] = inst.get();
 124         obj.add(*inst.release());
 125 }
 126
 127 void Scene::Loader::scene(const string &n)
 128 {
 129         obj.add(get_collection().get<Scene>(n));
 130 }
 131
 132
 133 DataFile::Loader::ActionMap Scene::GenericLoader::shared_actions;
 134
 135 Scene::GenericLoader::GenericLoader(DataFile::Collection &c):
 136         coll(c),
 137         scene(0),
 138         scene_loader(0)
 139 {
 140         set_actions(shared_actions);
 141 }
 142
 143 Scene::GenericLoader::~GenericLoader()
 144 {
 145         delete scene;
 146         delete scene_loader;
 147 }
 148
 149 void Scene::GenericLoader::init_actions()
 150 {
 151         add("type", &GenericLoader::type);
 152 }
 153
 154 void Scene::GenericLoader::type(const DataFile::Symbol &sym)
 155 {
 156         get_scene_registry().invoke(sym.name, *this);
 157 }
 158
 159 } // namespace GL
 160 } // namespace Msp