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 Matrix Object::identity_matrix;
  21
  22 Object::Object():
  23         lods(1),
  24         lod0_watched(false)
  25 { }
  26
  27 Object::Object(const Mesh *m, const Technique *t):
  28         lods(1),
  29         lod0_watched(false)
  30 {
  31         set_mesh(m);
  32         set_technique(t);
  33 }
  34
  35 // TODO should have copy-c'tor to set watch on lod0 mesh if necessary
  36
  37 Object::~Object()
  38 {
  39         if(lods[0].mesh && lod0_watched)
  40                 if(ResourceManager *rm = lods[0].mesh->get_manager())
  41                         rm->unwatch_resource(*lods[0].mesh, *this);
  42 }
  43
  44 Object::LevelOfDetail &Object::get_lod(unsigned i, const char *caller)
  45 {
  46         if(i>lods.size())
  47                 throw out_of_range(caller);
  48         if(i>0 && (!lods[0].mesh || !lods[0].technique))
  49                 throw invalid_operation(caller);
  50
  51         if(i==lods.size())
  52                 lods.push_back(lods.back());
  53
  54         return lods[i];
  55 }
  56
  57 void Object::set_mesh(unsigned i, const Mesh *m)
  58 {
  59         RefPtr<const Mesh> &ptr = get_lod(i, "Object::set_mesh").mesh;
  60         if(i==0 && ptr && lod0_watched)
  61                 if(ResourceManager *rm = ptr->get_manager())
  62                         rm->unwatch_resource(*ptr, *this);
  63         ptr = m;
  64         ptr.keep();
  65         lod0_watched = false;
  66
  67         if(i==0 && m)
  68                 if(ResourceManager *rm = m->get_manager())
  69                 {
  70                         rm->watch_resource(*m, *this);
  71                         lod0_watched = true;
  72                 }
  73
  74         update_bounding_sphere();
  75 }
  76
  77 void Object::update_bounding_sphere()
  78 {
  79         vector<Vector3> points;
  80         for(vector<LevelOfDetail>::const_iterator i=lods.begin(); i!=lods.end(); ++i)
  81         {
  82                 if(!i->mesh || !i->mesh->is_loaded())
  83                         continue;
  84
  85                 const VertexArray &vertices = i->mesh->get_vertices();
  86
  87                 int offset = vertices.get_format().offset(VERTEX3);
  88                 bool three = true;
  89                 if(offset<0)
  90                 {
  91                         offset = vertices.get_format().offset(VERTEX2);
  92                         three = false;
  93                         if(offset<0)
  94                                 continue;
  95                 }
  96
  97                 unsigned n_vertices = vertices.size();
  98                 points.reserve(points.size()+n_vertices);
  99                 for(unsigned j=0; j<n_vertices; ++j)
 100                 {
 101                         const float *v = vertices[j];
 102                         points.push_back(Vector3(v[offset], v[offset+1], (three ? v[offset+2] : 0.0f)));
 103                 }
 104         }
 105
 106         /* Don't touch the bounding sphere if we had no vertices to avoid
 107         overwriting a possible hint. */
 108         if(points.empty())
 109                 return;
 110
 111         bounding_sphere = Geometry::BoundingSphere<float, 3>::from_point_cloud(points.begin(), points.end());
 112 }
 113
 114 const Mesh *Object::get_mesh(unsigned i) const
 115 {
 116         if(i>=lods.size())
 117                 return 0;
 118
 119         return lods[i].mesh.get();
 120 }
 121
 122 void Object::set_technique(unsigned i, const Technique *t)
 123 {
 124         RefPtr<const Technique> &ptr = get_lod(i, "Object::set_technique").technique;
 125         ptr = t;
 126         ptr.keep();
 127 }
 128
 129 const Technique *Object::get_technique(unsigned i) const
 130 {
 131         if(i>=lods.size())
 132                 return 0;
 133
 134         return lods[i].technique.get();
 135 }
 136
 137 void Object::render(Renderer &renderer, const Tag &tag) const
 138 {
 139         const RenderPass *pass = get_pass(tag, 0);
 140         if(!pass)
 141                 return;
 142
 143         Renderer::Push push(renderer);
 144         pass->apply(renderer);
 145
 146         setup_render(renderer, tag);
 147         lods.front().mesh->draw(renderer);
 148         finish_render(renderer, tag);
 149 }
 150
 151 void Object::render(Renderer &renderer, const ObjectInstance &inst, const Tag &tag) const
 152 {
 153         unsigned lod = min<unsigned>(inst.get_level_of_detail(renderer), lods.size()-1);
 154         const RenderPass *pass = get_pass(tag, lod);
 155         if(!pass)
 156                 return;
 157
 158         Renderer::Push push(renderer);
 159         pass->apply(renderer);
 160
 161         setup_render(renderer, tag);
 162         inst.setup_render(renderer, tag);
 163         lods[lod].mesh->draw(renderer);
 164         inst.finish_render(renderer, tag);
 165         finish_render(renderer, tag);
 166 }
 167
 168 const RenderPass *Object::get_pass(const Tag &tag, unsigned lod) const
 169 {
 170         const Technique *tech = lods[lod].technique.get();
 171         if(!tech)
 172                 throw logic_error("no technique");
 173         if(!tech->has_pass(tag))
 174                 return 0;
 175         return &tech->get_pass(tag);
 176 }
 177
 178 void Object::resource_loaded(Resource &res)
 179 {
 180         if(&res==lods.front().mesh.get() && bounding_sphere.is_empty())
 181                 update_bounding_sphere();
 182 }
 183
 184 void Object::resource_removed(Resource &res)
 185 {
 186         if(&res==lods.front().mesh.get())
 187                 lod0_watched = false;
 188 }
 189
 190
 191 Object::Loader::Loader(Object &o):
 192         LodLoader(o, 0, 0)
 193 {
 194         init();
 195 }
 196
 197 Object::Loader::Loader(Object &o, Collection &c):
 198         LodLoader(o, 0, &c)
 199 {
 200         init();
 201 }
 202
 203 void Object::Loader::init()
 204 {
 205         add("bounding_sphere_hint", &Loader::bounding_sphere_hint);
 206         add("level_of_detail", &Loader::level_of_detail);
 207 }
 208
 209 void Object::Loader::finish()
 210 {
 211         obj.update_bounding_sphere();
 212 }
 213
 214 void Object::Loader::bounding_sphere_hint(float x, float y, float z, float r)
 215 {
 216         obj.bounding_sphere = Geometry::BoundingSphere<float, 3>(Vector3(x, y, z), r);
 217 }
 218
 219 void Object::Loader::level_of_detail(unsigned i)
 220 {
 221         LodLoader ldr(obj, i, coll);
 222         load_sub_with(ldr);
 223 }
 224
 225
 226 Object::LodLoader::LodLoader(Object &o, unsigned i, Collection *c):
 227         DataFile::CollectionObjectLoader<Object>(o, c),
 228         index(i),
 229         lod(obj.get_lod(index, "Object::LodLoader::LodLoader"))
 230 {
 231         add("mesh",      &LodLoader::mesh_inline);
 232         add("mesh",      &LodLoader::mesh);
 233         add("technique", &LodLoader::technique_inline);
 234         add("technique", &LodLoader::technique);
 235 }
 236
 237 void Object::LodLoader::mesh(const string &n)
 238 {
 239         obj.set_mesh(index, &get_collection().get<Mesh>(n));
 240 }
 241
 242 void Object::LodLoader::mesh_inline()
 243 {
 244         RefPtr<Mesh> msh = new Mesh;
 245         load_sub(*msh);
 246         lod.mesh = msh;
 247 }
 248
 249 void Object::LodLoader::technique(const std::string &n)
 250 {
 251         obj.set_technique(index, &get_collection().get<Technique>(n));
 252 }
 253
 254 void Object::LodLoader::technique_inline()
 255 {
 256         RefPtr<Technique> tech = new Technique;
 257         if(coll)
 258                 load_sub(*tech, get_collection());
 259         else
 260                 load_sub(*tech);
 261         lod.technique = tech;
 262 }
 263
 264 } // namespace GL
 265 } // namespace Msp