source/object.cpp

   1 #include <msp/datafile/collection.h>
   2 #include <msp/strings/format.h>
   3 #include "error.h"
   4 #include "material.h"
   5 #include "mesh.h"
   6 #include "object.h"
   7 #include "objectinstance.h"
   8 #include "program.h"
   9 #include "programdata.h"
  10 #include "renderer.h"
  11 #include "resourcemanager.h"
  12 #include "technique.h"
  13 #include "texturing.h"
  14
  15 using namespace std;
  16
  17 namespace Msp {
  18 namespace GL {
  19
  20 Object::Object():
  21         lods(1),
  22         lod0_watched(false)
  23 { }
  24
  25 Object::Object(const Mesh *m, const Technique *t):
  26         lods(1),
  27         lod0_watched(false)
  28 {
  29         set_mesh(m);
  30         set_technique(t);
  31 }
  32
  33 Object::~Object()
  34 {
  35         if(lods[0].mesh && lod0_watched)
  36                 if(ResourceManager *rm = lods[0].mesh->get_manager())
  37                         rm->unwatch_resource(*lods[0].mesh, *this);
  38 }
  39
  40 Object::LevelOfDetail &Object::get_lod(unsigned i, const char *caller)
  41 {
  42         if(i>lods.size())
  43                 throw out_of_range(caller);
  44         if(i>0 && (!lods[0].mesh || !lods[0].technique))
  45                 throw invalid_operation(caller);
  46
  47         if(i==lods.size())
  48                 lods.push_back(lods.back());
  49
  50         return lods[i];
  51 }
  52
  53 void Object::set_mesh(unsigned i, const Mesh *m)
  54 {
  55         RefPtr<const Mesh> &ptr = get_lod(i, "Object::set_mesh").mesh;
  56         if(i==0 && ptr && lod0_watched)
  57                 if(ResourceManager *rm = ptr->get_manager())
  58                         rm->unwatch_resource(*ptr, *this);
  59         ptr = m;
  60         ptr.keep();
  61         lod0_watched = false;
  62
  63         if(i==0 && m)
  64                 if(ResourceManager *rm = m->get_manager())
  65                 {
  66                         rm->watch_resource(*m, *this);
  67                         lod0_watched = true;
  68                 }
  69
  70         update_bounding_sphere();
  71 }
  72
  73 void Object::update_bounding_sphere()
  74 {
  75         vector<Vector3> points;
  76         for(vector<LevelOfDetail>::const_iterator i=lods.begin(); i!=lods.end(); ++i)
  77         {
  78                 if(!i->mesh || !i->mesh->is_loaded())
  79                         continue;
  80
  81                 const VertexArray &vertices = i->mesh->get_vertices();
  82
  83                 int offset = vertices.get_format().offset(VERTEX3);
  84                 bool three = true;
  85                 if(offset<0)
  86                 {
  87                         offset = vertices.get_format().offset(VERTEX2);
  88                         three = false;
  89                         if(offset<0)
  90                                 continue;
  91                 }
  92
  93                 unsigned n_vertices = vertices.size();
  94                 points.reserve(points.size()+n_vertices);
  95                 for(unsigned j=0; j<n_vertices; ++j)
  96                 {
  97                         const float *v = vertices[j];
  98                         points.push_back(Vector3(v[offset], v[offset+1], (three ? v[offset+2] : 0.0f)));
  99                 }
 100         }
 101
 102         /* Don't touch the bounding sphere if we had no vertices to avoid
 103         overwriting a possible hint. */
 104         if(points.empty())
 105                 return;
 106
 107         bounding_sphere = Geometry::BoundingSphere<float, 3>::from_point_cloud(points.begin(), points.end());
 108 }
 109
 110 const Mesh *Object::get_mesh(unsigned i) const
 111 {
 112         if(i>=lods.size())
 113                 return 0;
 114
 115         return lods[i].mesh.get();
 116 }
 117
 118 void Object::set_technique(unsigned i, const Technique *t)
 119 {
 120         RefPtr<const Technique> &ptr = get_lod(i, "Object::set_technique").technique;
 121         ptr = t;
 122         ptr.keep();
 123 }
 124
 125 const Technique *Object::get_technique(unsigned i) const
 126 {
 127         if(i>=lods.size())
 128                 return 0;
 129
 130         return lods[i].technique.get();
 131 }
 132
 133 void Object::render(Renderer &renderer, const Tag &tag) const
 134 {
 135         const RenderPass *pass = get_pass(tag, 0);
 136         if(!pass)
 137                 return;
 138
 139         Renderer::Push push(renderer);
 140         pass->apply(renderer);
 141
 142         setup_render(renderer, tag);
 143         lods.front().mesh->draw(renderer);
 144         finish_render(renderer, tag);
 145 }
 146
 147 void Object::render(Renderer &renderer, const ObjectInstance &inst, const Tag &tag) const
 148 {
 149         unsigned lod = min<unsigned>(inst.get_level_of_detail(renderer), lods.size()-1);
 150         const RenderPass *pass = get_pass(tag, lod);
 151         if(!pass)
 152                 return;
 153
 154         Renderer::Push push(renderer);
 155         pass->apply(renderer);
 156
 157         setup_render(renderer, tag);
 158         inst.setup_render(renderer, tag);
 159         lods[lod].mesh->draw(renderer);
 160         inst.finish_render(renderer, tag);
 161         finish_render(renderer, tag);
 162 }
 163
 164 const RenderPass *Object::get_pass(const Tag &tag, unsigned lod) const
 165 {
 166         const Technique *tech = lods[lod].technique.get();
 167         if(!tech)
 168                 throw logic_error("no technique");
 169         if(!tech->has_pass(tag))
 170                 return 0;
 171         return &tech->get_pass(tag);
 172 }
 173
 174 void Object::resource_loaded(Resource &res)
 175 {
 176         if(&res==lods.front().mesh.get() && bounding_sphere.is_empty())
 177                 update_bounding_sphere();
 178 }
 179
 180 void Object::resource_removed(Resource &res)
 181 {
 182         if(&res==lods.front().mesh.get())
 183                 lod0_watched = false;
 184 }
 185
 186
 187 Object::Loader::Loader(Object &o):
 188         LodLoader(o, 0, 0)
 189 {
 190         init();
 191 }
 192
 193 Object::Loader::Loader(Object &o, Collection &c):
 194         LodLoader(o, 0, &c)
 195 {
 196         init();
 197 }
 198
 199 void Object::Loader::init()
 200 {
 201         add("bounding_sphere_hint", &Loader::bounding_sphere_hint);
 202         add("level_of_detail", &Loader::level_of_detail);
 203 }
 204
 205 void Object::Loader::finish()
 206 {
 207         obj.update_bounding_sphere();
 208 }
 209
 210 void Object::Loader::bounding_sphere_hint(float x, float y, float z, float r)
 211 {
 212         obj.bounding_sphere = Geometry::BoundingSphere<float, 3>(Vector3(x, y, z), r);
 213 }
 214
 215 void Object::Loader::level_of_detail(unsigned i)
 216 {
 217         LodLoader ldr(obj, i, coll);
 218         load_sub_with(ldr);
 219 }
 220
 221
 222 Object::LodLoader::LodLoader(Object &o, unsigned i, Collection *c):
 223         DataFile::CollectionObjectLoader<Object>(o, c),
 224         index(i),
 225         lod(obj.get_lod(index, "Object::LodLoader::LodLoader"))
 226 {
 227         add("mesh",      &LodLoader::mesh_inline);
 228         add("mesh",      &LodLoader::mesh);
 229         add("technique", &LodLoader::technique_inline);
 230         add("technique", &LodLoader::technique);
 231 }
 232
 233 void Object::LodLoader::mesh(const string &n)
 234 {
 235         obj.set_mesh(index, &get_collection().get<Mesh>(n));
 236 }
 237
 238 void Object::LodLoader::mesh_inline()
 239 {
 240         RefPtr<Mesh> msh = new Mesh;
 241         load_sub(*msh);
 242         lod.mesh = msh;
 243 }
 244
 245 void Object::LodLoader::technique(const std::string &n)
 246 {
 247         obj.set_technique(index, &get_collection().get<Technique>(n));
 248 }
 249
 250 void Object::LodLoader::technique_inline()
 251 {
 252         RefPtr<Technique> tech = new Technique;
 253         if(coll)
 254                 load_sub(*tech, get_collection());
 255         else
 256                 load_sub(*tech);
 257         lod.technique = tech;
 258 }
 259
 260 } // namespace GL
 261 } // namespace Msp