source/render/object.cpp

   1 #include <msp/datafile/collection.h>
   2 #include <msp/fs/utils.h>
   3 #include <msp/strings/format.h>
   4 #include "error.h"
   5 #include "mesh.h"
   6 #include "object.h"
   7 #include "objectinstance.h"
   8 #include "renderer.h"
   9 #include "resourcemanager.h"
  10 #include "technique.h"
  11
  12 using namespace std;
  13
  14 namespace Msp {
  15 namespace GL {
  16
  17 const Matrix Object::identity_matrix;
  18
  19 Object::Object():
  20         lods(1),
  21         lod0_watched(false)
  22 { }
  23
  24 Object::Object(const Mesh *m, const Technique *t):
  25         lods(1),
  26         lod0_watched(false)
  27 {
  28         set_mesh(m);
  29         set_technique(t);
  30 }
  31
  32 // TODO should have copy-c'tor to set watch on lod0 mesh if necessary
  33
  34 Object::~Object()
  35 {
  36         if(lods[0].mesh && lod0_watched)
  37                 if(ResourceManager *rm = lods[0].mesh->get_manager())
  38                         rm->unobserve_resource(*lods[0].mesh, *this);
  39 }
  40
  41 Object::LevelOfDetail &Object::get_lod(unsigned i, const char *caller)
  42 {
  43         if(i>lods.size())
  44                 throw out_of_range(caller);
  45         if(i>0 && (!lods[0].mesh || !lods[0].technique))
  46                 throw invalid_operation(caller);
  47
  48         if(i==lods.size())
  49                 lods.push_back(lods.back());
  50
  51         return lods[i];
  52 }
  53
  54 void Object::set_mesh(unsigned i, const Mesh *m)
  55 {
  56         const Mesh *&ptr = get_lod(i, "Object::set_mesh").mesh;
  57         if(i==0 && ptr && lod0_watched)
  58                 if(ResourceManager *rm = ptr->get_manager())
  59                         rm->unobserve_resource(*ptr, *this);
  60         ptr = m;
  61         lod0_watched = false;
  62
  63         if(i==0 && m)
  64                 if(ResourceManager *rm = m->get_manager())
  65                 {
  66                         rm->observe_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(const LevelOfDetail &l: lods)
  77         {
  78                 if(!l.mesh || !l.mesh->is_loaded())
  79                         continue;
  80
  81                 const VertexArray &vertices = l.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 = reinterpret_cast<const float *>(vertices[j]+offset);
  98                         points.push_back(Vector3(v[0], v[1], (three ? v[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;
 116 }
 117
 118 void Object::set_technique(unsigned i, const Technique *t)
 119 {
 120         get_lod(i, "Object::set_technique").technique = t;
 121 }
 122
 123 const Technique *Object::get_technique(unsigned i) const
 124 {
 125         if(i>=lods.size())
 126                 return 0;
 127
 128         return lods[i].technique;
 129 }
 130
 131 void Object::render(Renderer &renderer, Tag tag) const
 132 {
 133         const RenderMethod *method = get_method(tag, 0);
 134         if(!method)
 135                 return;
 136
 137         const Mesh *mesh = lods.front().mesh;
 138         if (!mesh)
 139                 throw logic_error("no mesh");
 140
 141         Renderer::Push push(renderer);
 142         method->apply(renderer);
 143
 144         setup_render(renderer, tag);
 145         mesh->draw(renderer);
 146         finish_render(renderer, tag);
 147 }
 148
 149 void Object::render(Renderer &renderer, const ObjectInstance &inst, Tag tag) const
 150 {
 151         unsigned lod = min<unsigned>(inst.get_level_of_detail(renderer), lods.size()-1);
 152         const RenderMethod *method = get_method(tag, lod);
 153         if(!method)
 154                 return;
 155
 156         const Mesh *mesh = lods[lod].mesh;
 157         if (!mesh)
 158                 throw logic_error("no mesh");
 159
 160         Renderer::Push push(renderer);
 161         method->apply(renderer);
 162
 163         setup_render(renderer, tag);
 164         inst.setup_render(renderer, tag);
 165         mesh->draw(renderer);
 166         inst.finish_render(renderer, tag);
 167         finish_render(renderer, tag);
 168 }
 169
 170 const RenderMethod *Object::get_method(Tag tag, unsigned lod) const
 171 {
 172         const Technique *tech = lods[lod].technique;
 173         if(!tech)
 174                 throw logic_error("no technique");
 175         return tech->find_method(tag);
 176 }
 177
 178 void Object::resource_loaded(Resource &res)
 179 {
 180         if(&res==lods.front().mesh && bounding_sphere.is_empty())
 181                 update_bounding_sphere();
 182 }
 183
 184 void Object::resource_removed(Resource &res)
 185 {
 186         if(&res==lods.front().mesh)
 187                 lod0_watched = false;
 188 }
 189
 190
 191 Object::Loader::Loader(Object &o, Collection &c):
 192         LodLoader(o, 0, c)
 193 {
 194         add("bounding_sphere_hint", &Loader::bounding_sphere_hint);
 195         add("level_of_detail", &Loader::level_of_detail);
 196 }
 197
 198 void Object::Loader::finish()
 199 {
 200         obj.update_bounding_sphere();
 201 }
 202
 203 void Object::Loader::bounding_sphere_hint(float x, float y, float z, float r)
 204 {
 205         obj.bounding_sphere = Geometry::BoundingSphere<float, 3>(Vector3(x, y, z), r);
 206 }
 207
 208 void Object::Loader::level_of_detail(unsigned i)
 209 {
 210         LodLoader ldr(obj, i, get_collection());
 211         load_sub_with(ldr);
 212 }
 213
 214
 215 Object::LodLoader::LodLoader(Object &o, unsigned i, Collection &c):
 216         DataFile::CollectionObjectLoader<Object>(o, &c),
 217         index(i),
 218         lod(obj.get_lod(index, "Object::LodLoader::LodLoader"))
 219 {
 220         add("mesh",      &LodLoader::mesh_inline);
 221         add("mesh",      &LodLoader::mesh);
 222         add("technique", &LodLoader::technique_inline);
 223         add("technique", &LodLoader::technique);
 224 }
 225
 226 void Object::LodLoader::mesh(const string &n)
 227 {
 228         obj.set_mesh(index, &get_collection().get<Mesh>(n));
 229 }
 230
 231 void Object::LodLoader::mesh_inline()
 232 {
 233         RefPtr<Mesh> msh = new Mesh;
 234         load_sub(*msh);
 235         get_collection().add(format("%s/lod%d.mesh", FS::basename(get_source()), index), msh.get());
 236         lod.mesh = msh.release();
 237 }
 238
 239 void Object::LodLoader::technique(const string &n)
 240 {
 241         obj.set_technique(index, &get_collection().get<Technique>(n));
 242 }
 243
 244 void Object::LodLoader::technique_inline()
 245 {
 246         RefPtr<Technique> tech = new Technique;
 247         Technique::Loader ldr(*tech, get_collection());
 248         string name = format("%s/lod%d.tech", FS::basename(get_source()), index);
 249         ldr.set_inline_base_name(name);
 250         load_sub(*tech, get_collection());
 251         get_collection().add(name, tech.get());
 252         lod.technique = tech.release();
 253 }
 254
 255 } // namespace GL
 256 } // namespace Msp