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