source/render/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->unobserve_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->unobserve_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->observe_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, Tag tag) const
 138 {
 139         const RenderPass *pass = get_pass(tag, 0);
 140         if(!pass)
 141                 return;
 142
 143         const Mesh *mesh = lods.front().mesh.get();
 144         if (!mesh)
 145                 throw logic_error("no mesh");
 146
 147         Renderer::Push push(renderer);
 148         pass->apply(renderer);
 149
 150         setup_render(renderer, tag);
 151         mesh->draw(renderer);
 152         finish_render(renderer, tag);
 153 }
 154
 155 void Object::render(Renderer &renderer, const ObjectInstance &inst, Tag tag) const
 156 {
 157         unsigned lod = min<unsigned>(inst.get_level_of_detail(renderer), lods.size()-1);
 158         const RenderPass *pass = get_pass(tag, lod);
 159         if(!pass)
 160                 return;
 161
 162         const Mesh *mesh = lods[lod].mesh.get();
 163         if (!mesh)
 164                 throw logic_error("no mesh");
 165
 166         Renderer::Push push(renderer);
 167         pass->apply(renderer);
 168
 169         setup_render(renderer, tag);
 170         inst.setup_render(renderer, tag);
 171         mesh->draw(renderer);
 172         inst.finish_render(renderer, tag);
 173         finish_render(renderer, tag);
 174 }
 175
 176 const RenderPass *Object::get_pass(Tag tag, unsigned lod) const
 177 {
 178         const Technique *tech = lods[lod].technique.get();
 179         if(!tech)
 180                 throw logic_error("no technique");
 181         return tech->find_pass(tag);
 182 }
 183
 184 void Object::resource_loaded(Resource &res)
 185 {
 186         if(&res==lods.front().mesh.get() && bounding_sphere.is_empty())
 187                 update_bounding_sphere();
 188 }
 189
 190 void Object::resource_removed(Resource &res)
 191 {
 192         if(&res==lods.front().mesh.get())
 193                 lod0_watched = false;
 194 }
 195
 196
 197 Object::Loader::Loader(Object &o):
 198         LodLoader(o, 0, 0)
 199 {
 200         init();
 201 }
 202
 203 Object::Loader::Loader(Object &o, Collection &c):
 204         LodLoader(o, 0, &c)
 205 {
 206         init();
 207 }
 208
 209 void Object::Loader::init()
 210 {
 211         add("bounding_sphere_hint", &Loader::bounding_sphere_hint);
 212         add("level_of_detail", &Loader::level_of_detail);
 213 }
 214
 215 void Object::Loader::finish()
 216 {
 217         obj.update_bounding_sphere();
 218 }
 219
 220 void Object::Loader::bounding_sphere_hint(float x, float y, float z, float r)
 221 {
 222         obj.bounding_sphere = Geometry::BoundingSphere<float, 3>(Vector3(x, y, z), r);
 223 }
 224
 225 void Object::Loader::level_of_detail(unsigned i)
 226 {
 227         LodLoader ldr(obj, i, coll);
 228         load_sub_with(ldr);
 229 }
 230
 231
 232 Object::LodLoader::LodLoader(Object &o, unsigned i, Collection *c):
 233         DataFile::CollectionObjectLoader<Object>(o, c),
 234         index(i),
 235         lod(obj.get_lod(index, "Object::LodLoader::LodLoader"))
 236 {
 237         add("mesh",      &LodLoader::mesh_inline);
 238         add("mesh",      &LodLoader::mesh);
 239         add("technique", &LodLoader::technique_inline);
 240         add("technique", &LodLoader::technique);
 241 }
 242
 243 void Object::LodLoader::mesh(const string &n)
 244 {
 245         obj.set_mesh(index, &get_collection().get<Mesh>(n));
 246 }
 247
 248 void Object::LodLoader::mesh_inline()
 249 {
 250         RefPtr<Mesh> msh = new Mesh;
 251         load_sub(*msh);
 252         lod.mesh = msh;
 253 }
 254
 255 void Object::LodLoader::technique(const string &n)
 256 {
 257         obj.set_technique(index, &get_collection().get<Technique>(n));
 258 }
 259
 260 void Object::LodLoader::technique_inline()
 261 {
 262         RefPtr<Technique> tech = new Technique;
 263         if(coll)
 264                 load_sub(*tech, get_collection());
 265         else
 266                 load_sub(*tech);
 267         lod.technique = tech;
 268 }
 269
 270 } // namespace GL
 271 } // namespace Msp