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