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 // TODO should have copy-c'tor to set watch on lod0 mesh if necessary
  34
  35 Object::~Object()
  36 {
  37         if(lods[0].mesh && lod0_watched)
  38                 if(ResourceManager *rm = lods[0].mesh->get_manager())
  39                         rm->unwatch_resource(*lods[0].mesh, *this);
  40 }
  41
  42 Object::LevelOfDetail &Object::get_lod(unsigned i, const char *caller)
  43 {
  44         if(i>lods.size())
  45                 throw out_of_range(caller);
  46         if(i>0 && (!lods[0].mesh || !lods[0].technique))
  47                 throw invalid_operation(caller);
  48
  49         if(i==lods.size())
  50                 lods.push_back(lods.back());
  51
  52         return lods[i];
  53 }
  54
  55 void Object::set_mesh(unsigned i, const Mesh *m)
  56 {
  57         RefPtr<const Mesh> &ptr = get_lod(i, "Object::set_mesh").mesh;
  58         if(i==0 && ptr && lod0_watched)
  59                 if(ResourceManager *rm = ptr->get_manager())
  60                         rm->unwatch_resource(*ptr, *this);
  61         ptr = m;
  62         ptr.keep();
  63         lod0_watched = false;
  64
  65         if(i==0 && m)
  66                 if(ResourceManager *rm = m->get_manager())
  67                 {
  68                         rm->watch_resource(*m, *this);
  69                         lod0_watched = true;
  70                 }
  71
  72         update_bounding_sphere();
  73 }
  74
  75 void Object::update_bounding_sphere()
  76 {
  77         vector<Vector3> points;
  78         for(vector<LevelOfDetail>::const_iterator i=lods.begin(); i!=lods.end(); ++i)
  79         {
  80                 if(!i->mesh || !i->mesh->is_loaded())
  81                         continue;
  82
  83                 const VertexArray &vertices = i->mesh->get_vertices();
  84
  85                 int offset = vertices.get_format().offset(VERTEX3);
  86                 bool three = true;
  87                 if(offset<0)
  88                 {
  89                         offset = vertices.get_format().offset(VERTEX2);
  90                         three = false;
  91                         if(offset<0)
  92                                 continue;
  93                 }
  94
  95                 unsigned n_vertices = vertices.size();
  96                 points.reserve(points.size()+n_vertices);
  97                 for(unsigned j=0; j<n_vertices; ++j)
  98                 {
  99                         const float *v = vertices[j];
 100                         points.push_back(Vector3(v[offset], v[offset+1], (three ? v[offset+2] : 0.0f)));
 101                 }
 102         }
 103
 104         /* Don't touch the bounding sphere if we had no vertices to avoid
 105         overwriting a possible hint. */
 106         if(points.empty())
 107                 return;
 108
 109         bounding_sphere = Geometry::BoundingSphere<float, 3>::from_point_cloud(points.begin(), points.end());
 110 }
 111
 112 const Mesh *Object::get_mesh(unsigned i) const
 113 {
 114         if(i>=lods.size())
 115                 return 0;
 116
 117         return lods[i].mesh.get();
 118 }
 119
 120 void Object::set_technique(unsigned i, const Technique *t)
 121 {
 122         RefPtr<const Technique> &ptr = get_lod(i, "Object::set_technique").technique;
 123         ptr = t;
 124         ptr.keep();
 125 }
 126
 127 const Technique *Object::get_technique(unsigned i) const
 128 {
 129         if(i>=lods.size())
 130                 return 0;
 131
 132         return lods[i].technique.get();
 133 }
 134
 135 void Object::render(Renderer &renderer, const Tag &tag) const
 136 {
 137         const RenderPass *pass = get_pass(tag, 0);
 138         if(!pass)
 139                 return;
 140
 141         Renderer::Push push(renderer);
 142         pass->apply(renderer);
 143
 144         setup_render(renderer, tag);
 145         lods.front().mesh->draw(renderer);
 146         finish_render(renderer, tag);
 147 }
 148
 149 void Object::render(Renderer &renderer, const ObjectInstance &inst, const Tag &tag) const
 150 {
 151         unsigned lod = min<unsigned>(inst.get_level_of_detail(renderer), lods.size()-1);
 152         const RenderPass *pass = get_pass(tag, lod);
 153         if(!pass)
 154                 return;
 155
 156         Renderer::Push push(renderer);
 157         pass->apply(renderer);
 158
 159         setup_render(renderer, tag);
 160         inst.setup_render(renderer, tag);
 161         lods[lod].mesh->draw(renderer);
 162         inst.finish_render(renderer, tag);
 163         finish_render(renderer, tag);
 164 }
 165
 166 const RenderPass *Object::get_pass(const Tag &tag, unsigned lod) const
 167 {
 168         const Technique *tech = lods[lod].technique.get();
 169         if(!tech)
 170                 throw logic_error("no technique");
 171         if(!tech->has_pass(tag))
 172                 return 0;
 173         return &tech->get_pass(tag);
 174 }
 175
 176 void Object::resource_loaded(Resource &res)
 177 {
 178         if(&res==lods.front().mesh.get() && bounding_sphere.is_empty())
 179                 update_bounding_sphere();
 180 }
 181
 182 void Object::resource_removed(Resource &res)
 183 {
 184         if(&res==lods.front().mesh.get())
 185                 lod0_watched = false;
 186 }
 187
 188
 189 Object::Loader::Loader(Object &o):
 190         LodLoader(o, 0, 0)
 191 {
 192         init();
 193 }
 194
 195 Object::Loader::Loader(Object &o, Collection &c):
 196         LodLoader(o, 0, &c)
 197 {
 198         init();
 199 }
 200
 201 void Object::Loader::init()
 202 {
 203         add("bounding_sphere_hint", &Loader::bounding_sphere_hint);
 204         add("level_of_detail", &Loader::level_of_detail);
 205 }
 206
 207 void Object::Loader::finish()
 208 {
 209         obj.update_bounding_sphere();
 210 }
 211
 212 void Object::Loader::bounding_sphere_hint(float x, float y, float z, float r)
 213 {
 214         obj.bounding_sphere = Geometry::BoundingSphere<float, 3>(Vector3(x, y, z), r);
 215 }
 216
 217 void Object::Loader::level_of_detail(unsigned i)
 218 {
 219         LodLoader ldr(obj, i, coll);
 220         load_sub_with(ldr);
 221 }
 222
 223
 224 Object::LodLoader::LodLoader(Object &o, unsigned i, Collection *c):
 225         DataFile::CollectionObjectLoader<Object>(o, c),
 226         index(i),
 227         lod(obj.get_lod(index, "Object::LodLoader::LodLoader"))
 228 {
 229         add("mesh",      &LodLoader::mesh_inline);
 230         add("mesh",      &LodLoader::mesh);
 231         add("technique", &LodLoader::technique_inline);
 232         add("technique", &LodLoader::technique);
 233 }
 234
 235 void Object::LodLoader::mesh(const string &n)
 236 {
 237         obj.set_mesh(index, &get_collection().get<Mesh>(n));
 238 }
 239
 240 void Object::LodLoader::mesh_inline()
 241 {
 242         RefPtr<Mesh> msh = new Mesh;
 243         load_sub(*msh);
 244         lod.mesh = msh;
 245 }
 246
 247 void Object::LodLoader::technique(const std::string &n)
 248 {
 249         obj.set_technique(index, &get_collection().get<Technique>(n));
 250 }
 251
 252 void Object::LodLoader::technique_inline()
 253 {
 254         RefPtr<Technique> tech = new Technique;
 255         if(coll)
 256                 load_sub(*tech, get_collection());
 257         else
 258                 load_sub(*tech);
 259         lod.technique = tech;
 260 }
 261
 262 } // namespace GL
 263 } // namespace Msp