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 {
  26         set_mesh(m);
  27         set_technique(t);
  28 }
  29
  30 Object::~Object()
  31 {
  32         if(lods[0].mesh)
  33                 if(ResourceManager *rm = lods[0].mesh->get_manager())
  34                         rm->unwatch_resource(*lods[0].mesh, *this);
  35 }
  36
  37 Object::LevelOfDetail &Object::get_lod(unsigned i, const char *caller)
  38 {
  39         if(i>lods.size())
  40                 throw out_of_range(caller);
  41         if(i>0 && (!lods[0].mesh || !lods[0].technique))
  42                 throw invalid_operation(caller);
  43
  44         if(i==lods.size())
  45                 lods.push_back(lods.back());
  46
  47         return lods[i];
  48 }
  49
  50 void Object::set_mesh(unsigned i, const Mesh *m)
  51 {
  52         RefPtr<const Mesh> &ptr = get_lod(i, "Object::set_mesh").mesh;
  53         if(i==0 && ptr)
  54                 if(ResourceManager *rm = ptr->get_manager())
  55                         rm->unwatch_resource(*ptr, *this);
  56         ptr = m;
  57         ptr.keep();
  58
  59         if(i==0 && m)
  60                 if(ResourceManager *rm = m->get_manager())
  61                         rm->watch_resource(*m, *this);
  62
  63         update_bounding_sphere();
  64 }
  65
  66 void Object::update_bounding_sphere()
  67 {
  68         vector<Vector3> points;
  69         for(vector<LevelOfDetail>::const_iterator i=lods.begin(); i!=lods.end(); ++i)
  70         {
  71                 if(!i->mesh)
  72                         continue;
  73
  74                 const VertexArray &vertices = i->mesh->get_vertices();
  75
  76                 int offset = vertices.get_format().offset(VERTEX3);
  77                 bool three = true;
  78                 if(offset<0)
  79                 {
  80                         offset = vertices.get_format().offset(VERTEX2);
  81                         three = false;
  82                         if(offset<0)
  83                                 continue;
  84                 }
  85
  86                 unsigned n_vertices = vertices.size();
  87                 points.reserve(points.size()+n_vertices);
  88                 for(unsigned j=0; j<n_vertices; ++j)
  89                 {
  90                         const float *v = vertices[j];
  91                         points.push_back(Vector3(v[offset], v[offset+1], (three ? v[offset+2] : 0.0f)));
  92                 }
  93         }
  94
  95         bounding_sphere = Geometry::BoundingSphere<float, 3>::from_point_cloud(points.begin(), points.end());
  96 }
  97
  98 const Mesh *Object::get_mesh(unsigned i) const
  99 {
 100         if(i>=lods.size())
 101                 return 0;
 102
 103         return lods[i].mesh.get();
 104 }
 105
 106 void Object::set_technique(unsigned i, const Technique *t)
 107 {
 108         RefPtr<const Technique> &ptr = get_lod(i, "Object::set_technique").technique;
 109         ptr = t;
 110         ptr.keep();
 111 }
 112
 113 const Technique *Object::get_technique(unsigned i) const
 114 {
 115         if(i>=lods.size())
 116                 return 0;
 117
 118         return lods[i].technique.get();
 119 }
 120
 121 void Object::render(const Tag &tag) const
 122 {
 123         const RenderPass *pass = get_pass(tag, 0);
 124         if(!pass)
 125                 return;
 126
 127         Bind bind_shader(pass->get_shader_program());
 128         if(pass->get_shader_data())
 129                 pass->get_shader_data()->apply();
 130         Bind bind_material(pass->get_material());
 131         Bind bind_texturing(pass->get_texturing());
 132
 133         lods.front().mesh->draw();
 134 }
 135
 136 void Object::render(Renderer &renderer, const Tag &tag) const
 137 {
 138         const RenderPass *pass = get_pass(tag, 0);
 139         if(!pass)
 140                 return;
 141
 142         Renderer::Push push(renderer);
 143         pass->apply(renderer);
 144
 145         setup_render(renderer, tag);
 146         lods.front().mesh->draw(renderer);
 147         finish_render(renderer, tag);
 148 }
 149
 150 void Object::render(Renderer &renderer, const ObjectInstance &inst, const Tag &tag) const
 151 {
 152         unsigned lod = min<unsigned>(inst.get_level_of_detail(renderer), lods.size()-1);
 153         const RenderPass *pass = get_pass(tag, lod);
 154         if(!pass)
 155                 return;
 156
 157         Renderer::Push push(renderer);
 158         pass->apply(renderer);
 159
 160         setup_render(renderer, tag);
 161         inst.setup_render(renderer, tag);
 162         lods[lod].mesh->draw(renderer);
 163         inst.finish_render(renderer, tag);
 164         finish_render(renderer, tag);
 165 }
 166
 167 const RenderPass *Object::get_pass(const Tag &tag, unsigned lod) const
 168 {
 169         const Technique *tech = lods[lod].technique.get();
 170         if(!tech)
 171                 throw logic_error("no technique");
 172         if(!tech->has_pass(tag))
 173                 return 0;
 174         return &tech->get_pass(tag);
 175 }
 176
 177 void Object::resource_loaded(Resource &res)
 178 {
 179         if(&res==lods.front().mesh.get() && bounding_sphere.is_empty())
 180                 update_bounding_sphere();
 181 }
 182
 183
 184 Object::Loader::Loader(Object &o):
 185         LodLoader(o, 0, 0)
 186 {
 187         init();
 188 }
 189
 190 Object::Loader::Loader(Object &o, Collection &c):
 191         LodLoader(o, 0, &c)
 192 {
 193         init();
 194 }
 195
 196 void Object::Loader::init()
 197 {
 198         add("level_of_detail", &Loader::level_of_detail);
 199 }
 200
 201 void Object::Loader::finish()
 202 {
 203         obj.update_bounding_sphere();
 204 }
 205
 206 void Object::Loader::level_of_detail(unsigned i)
 207 {
 208         LodLoader ldr(obj, i, coll);
 209         load_sub_with(ldr);
 210 }
 211
 212
 213 Object::LodLoader::LodLoader(Object &o, unsigned i, Collection *c):
 214         DataFile::CollectionObjectLoader<Object>(o, c),
 215         index(i),
 216         lod(obj.get_lod(index, "Object::LodLoader::LodLoader"))
 217 {
 218         add("mesh",      &LodLoader::mesh_inline);
 219         add("mesh",      &LodLoader::mesh);
 220         add("technique", &LodLoader::technique_inline);
 221         add("technique", &LodLoader::technique);
 222 }
 223
 224 void Object::LodLoader::mesh(const string &n)
 225 {
 226         obj.set_mesh(index, &get_collection().get<Mesh>(n));
 227 }
 228
 229 void Object::LodLoader::mesh_inline()
 230 {
 231         RefPtr<Mesh> msh = new Mesh;
 232         load_sub(*msh);
 233         lod.mesh = msh;
 234 }
 235
 236 void Object::LodLoader::technique(const std::string &n)
 237 {
 238         obj.set_technique(index, &get_collection().get<Technique>(n));
 239 }
 240
 241 void Object::LodLoader::technique_inline()
 242 {
 243         RefPtr<Technique> tech = new Technique;
 244         if(coll)
 245                 load_sub(*tech, get_collection());
 246         else
 247                 load_sub(*tech);
 248         lod.technique = tech;
 249 }
 250
 251 } // namespace GL
 252 } // namespace Msp