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 "material.h"
   6 #include "mesh.h"
   7 #include "object.h"
   8 #include "objectinstance.h"
   9 #include "program.h"
  10 #include "programdata.h"
  11 #include "renderer.h"
  12 #include "resourcemanager.h"
  13 #include "technique.h"
  14 #include "texturing.h"
  15
  16 using namespace std;
  17
  18 namespace Msp {
  19 namespace GL {
  20
  21 Matrix Object::identity_matrix;
  22
  23 Object::Object():
  24         lods(1),
  25         lod0_watched(false)
  26 { }
  27
  28 Object::Object(const Mesh *m, const Technique *t):
  29         lods(1),
  30         lod0_watched(false)
  31 {
  32         set_mesh(m);
  33         set_technique(t);
  34 }
  35
  36 // TODO should have copy-c'tor to set watch on lod0 mesh if necessary
  37
  38 Object::~Object()
  39 {
  40         if(lods[0].mesh && lod0_watched)
  41                 if(ResourceManager *rm = lods[0].mesh->get_manager())
  42                         rm->unobserve_resource(*lods[0].mesh, *this);
  43 }
  44
  45 Object::LevelOfDetail &Object::get_lod(unsigned i, const char *caller)
  46 {
  47         if(i>lods.size())
  48                 throw out_of_range(caller);
  49         if(i>0 && (!lods[0].mesh || !lods[0].technique))
  50                 throw invalid_operation(caller);
  51
  52         if(i==lods.size())
  53                 lods.push_back(lods.back());
  54
  55         return lods[i];
  56 }
  57
  58 void Object::set_mesh(unsigned i, const Mesh *m)
  59 {
  60         const Mesh *&ptr = get_lod(i, "Object::set_mesh").mesh;
  61         if(i==0 && ptr && lod0_watched)
  62                 if(ResourceManager *rm = ptr->get_manager())
  63                         rm->unobserve_resource(*ptr, *this);
  64         ptr = m;
  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;
 120 }
 121
 122 void Object::set_technique(unsigned i, const Technique *t)
 123 {
 124         get_lod(i, "Object::set_technique").technique = t;
 125 }
 126
 127 const Technique *Object::get_technique(unsigned i) const
 128 {
 129         if(i>=lods.size())
 130                 return 0;
 131
 132         return lods[i].technique;
 133 }
 134
 135 void Object::render(Renderer &renderer, Tag tag) const
 136 {
 137         const RenderPass *pass = get_pass(tag, 0);
 138         if(!pass)
 139                 return;
 140
 141         const Mesh *mesh = lods.front().mesh;
 142         if (!mesh)
 143                 throw logic_error("no mesh");
 144
 145         Renderer::Push push(renderer);
 146         pass->apply(renderer);
 147
 148         setup_render(renderer, tag);
 149         mesh->draw(renderer);
 150         finish_render(renderer, tag);
 151 }
 152
 153 void Object::render(Renderer &renderer, const ObjectInstance &inst, Tag tag) const
 154 {
 155         unsigned lod = min<unsigned>(inst.get_level_of_detail(renderer), lods.size()-1);
 156         const RenderPass *pass = get_pass(tag, lod);
 157         if(!pass)
 158                 return;
 159
 160         const Mesh *mesh = lods[lod].mesh;
 161         if (!mesh)
 162                 throw logic_error("no mesh");
 163
 164         Renderer::Push push(renderer);
 165         pass->apply(renderer);
 166
 167         setup_render(renderer, tag);
 168         inst.setup_render(renderer, tag);
 169         mesh->draw(renderer);
 170         inst.finish_render(renderer, tag);
 171         finish_render(renderer, tag);
 172 }
 173
 174 const RenderPass *Object::get_pass(Tag tag, unsigned lod) const
 175 {
 176         const Technique *tech = lods[lod].technique;
 177         if(!tech)
 178                 throw logic_error("no technique");
 179         return tech->find_pass(tag);
 180 }
 181
 182 void Object::resource_loaded(Resource &res)
 183 {
 184         if(&res==lods.front().mesh && bounding_sphere.is_empty())
 185                 update_bounding_sphere();
 186 }
 187
 188 void Object::resource_removed(Resource &res)
 189 {
 190         if(&res==lods.front().mesh)
 191                 lod0_watched = false;
 192 }
 193
 194
 195 Object::Loader::Loader(Object &o):
 196         LodLoader(o, 0, 0)
 197 {
 198         init();
 199 }
 200
 201 Object::Loader::Loader(Object &o, Collection &c):
 202         LodLoader(o, 0, &c)
 203 {
 204         init();
 205 }
 206
 207 void Object::Loader::init()
 208 {
 209         add("bounding_sphere_hint", &Loader::bounding_sphere_hint);
 210         add("level_of_detail", &Loader::level_of_detail);
 211 }
 212
 213 void Object::Loader::finish()
 214 {
 215         obj.update_bounding_sphere();
 216 }
 217
 218 void Object::Loader::bounding_sphere_hint(float x, float y, float z, float r)
 219 {
 220         obj.bounding_sphere = Geometry::BoundingSphere<float, 3>(Vector3(x, y, z), r);
 221 }
 222
 223 void Object::Loader::level_of_detail(unsigned i)
 224 {
 225         LodLoader ldr(obj, i, coll);
 226         load_sub_with(ldr);
 227 }
 228
 229
 230 Object::LodLoader::LodLoader(Object &o, unsigned i, Collection *c):
 231         DataFile::CollectionObjectLoader<Object>(o, c),
 232         index(i),
 233         lod(obj.get_lod(index, "Object::LodLoader::LodLoader"))
 234 {
 235         add("mesh",      &LodLoader::mesh_inline);
 236         add("mesh",      &LodLoader::mesh);
 237         add("technique", &LodLoader::technique_inline);
 238         add("technique", &LodLoader::technique);
 239 }
 240
 241 void Object::LodLoader::mesh(const string &n)
 242 {
 243         obj.set_mesh(index, &get_collection().get<Mesh>(n));
 244 }
 245
 246 void Object::LodLoader::mesh_inline()
 247 {
 248         RefPtr<Mesh> msh = new Mesh;
 249         load_sub(*msh);
 250         get_collection().add(format("%s/lod%d.mesh", FS::basename(get_source()), index), msh.get());
 251         lod.mesh = msh.release();
 252 }
 253
 254 void Object::LodLoader::technique(const string &n)
 255 {
 256         obj.set_technique(index, &get_collection().get<Technique>(n));
 257 }
 258
 259 void Object::LodLoader::technique_inline()
 260 {
 261         RefPtr<Technique> tech = new Technique;
 262         Technique::Loader ldr(*tech, get_collection());
 263         string name = format("%s/lod%d.tech", FS::basename(get_source()), index);
 264         ldr.set_inline_base_name(name);
 265         load_sub(*tech, get_collection());
 266         get_collection().add(name, tech.get());
 267         lod.technique = tech.release();
 268 }
 269
 270 } // namespace GL
 271 } // namespace Msp