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
  15 using namespace std;
  16
  17 namespace Msp {
  18 namespace GL {
  19
  20 const 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         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         lod0_watched = false;
  65
  66         if(i==0 && m)
  67                 if(ResourceManager *rm = m->get_manager())
  68                 {
  69                         rm->observe_resource(*m, *this);
  70                         lod0_watched = true;
  71                 }
  72
  73         update_bounding_sphere();
  74 }
  75
  76 void Object::update_bounding_sphere()
  77 {
  78         vector<Vector3> points;
  79         for(const LevelOfDetail &l: lods)
  80         {
  81                 if(!l.mesh || !l.mesh->is_loaded())
  82                         continue;
  83
  84                 const VertexArray &vertices = l.mesh->get_vertices();
  85
  86                 int offset = vertices.get_format().offset(VERTEX3);
  87                 bool three = true;
  88                 if(offset<0)
  89                 {
  90                         offset = vertices.get_format().offset(VERTEX2);
  91                         three = false;
  92                         if(offset<0)
  93                                 continue;
  94                 }
  95
  96                 unsigned n_vertices = vertices.size();
  97                 points.reserve(points.size()+n_vertices);
  98                 for(unsigned j=0; j<n_vertices; ++j)
  99                 {
 100                         const float *v = reinterpret_cast<const float *>(vertices[j]+offset);
 101                         points.push_back(Vector3(v[0], v[1], (three ? v[2] : 0.0f)));
 102                 }
 103         }
 104
 105         /* Don't touch the bounding sphere if we had no vertices to avoid
 106         overwriting a possible hint. */
 107         if(points.empty())
 108                 return;
 109
 110         bounding_sphere = Geometry::BoundingSphere<float, 3>::from_point_cloud(points.begin(), points.end());
 111 }
 112
 113 const Mesh *Object::get_mesh(unsigned i) const
 114 {
 115         if(i>=lods.size())
 116                 return 0;
 117
 118         return lods[i].mesh;
 119 }
 120
 121 void Object::set_technique(unsigned i, const Technique *t)
 122 {
 123         get_lod(i, "Object::set_technique").technique = t;
 124 }
 125
 126 const Technique *Object::get_technique(unsigned i) const
 127 {
 128         if(i>=lods.size())
 129                 return 0;
 130
 131         return lods[i].technique;
 132 }
 133
 134 void Object::render(Renderer &renderer, Tag tag) const
 135 {
 136         const RenderPass *pass = get_pass(tag, 0);
 137         if(!pass)
 138                 return;
 139
 140         const Mesh *mesh = lods.front().mesh;
 141         if (!mesh)
 142                 throw logic_error("no mesh");
 143
 144         Renderer::Push push(renderer);
 145         pass->apply(renderer);
 146
 147         setup_render(renderer, tag);
 148         mesh->draw(renderer);
 149         finish_render(renderer, tag);
 150 }
 151
 152 void Object::render(Renderer &renderer, const ObjectInstance &inst, Tag tag) const
 153 {
 154         unsigned lod = min<unsigned>(inst.get_level_of_detail(renderer), lods.size()-1);
 155         const RenderPass *pass = get_pass(tag, lod);
 156         if(!pass)
 157                 return;
 158
 159         const Mesh *mesh = lods[lod].mesh;
 160         if (!mesh)
 161                 throw logic_error("no mesh");
 162
 163         Renderer::Push push(renderer);
 164         pass->apply(renderer);
 165
 166         setup_render(renderer, tag);
 167         inst.setup_render(renderer, tag);
 168         mesh->draw(renderer);
 169         inst.finish_render(renderer, tag);
 170         finish_render(renderer, tag);
 171 }
 172
 173 const RenderPass *Object::get_pass(Tag tag, unsigned lod) const
 174 {
 175         const Technique *tech = lods[lod].technique;
 176         if(!tech)
 177                 throw logic_error("no technique");
 178         return tech->find_pass(tag);
 179 }
 180
 181 void Object::resource_loaded(Resource &res)
 182 {
 183         if(&res==lods.front().mesh && bounding_sphere.is_empty())
 184                 update_bounding_sphere();
 185 }
 186
 187 void Object::resource_removed(Resource &res)
 188 {
 189         if(&res==lods.front().mesh)
 190                 lod0_watched = false;
 191 }
 192
 193
 194 Object::Loader::Loader(Object &o):
 195         LodLoader(o, 0, 0)
 196 {
 197         init();
 198 }
 199
 200 Object::Loader::Loader(Object &o, Collection &c):
 201         LodLoader(o, 0, &c)
 202 {
 203         init();
 204 }
 205
 206 void Object::Loader::init()
 207 {
 208         add("bounding_sphere_hint", &Loader::bounding_sphere_hint);
 209         add("level_of_detail", &Loader::level_of_detail);
 210 }
 211
 212 void Object::Loader::finish()
 213 {
 214         obj.update_bounding_sphere();
 215 }
 216
 217 void Object::Loader::bounding_sphere_hint(float x, float y, float z, float r)
 218 {
 219         obj.bounding_sphere = Geometry::BoundingSphere<float, 3>(Vector3(x, y, z), r);
 220 }
 221
 222 void Object::Loader::level_of_detail(unsigned i)
 223 {
 224         LodLoader ldr(obj, i, coll);
 225         load_sub_with(ldr);
 226 }
 227
 228
 229 Object::LodLoader::LodLoader(Object &o, unsigned i, Collection *c):
 230         DataFile::CollectionObjectLoader<Object>(o, c),
 231         index(i),
 232         lod(obj.get_lod(index, "Object::LodLoader::LodLoader"))
 233 {
 234         add("mesh",      &LodLoader::mesh_inline);
 235         add("mesh",      &LodLoader::mesh);
 236         add("technique", &LodLoader::technique_inline);
 237         add("technique", &LodLoader::technique);
 238 }
 239
 240 void Object::LodLoader::mesh(const string &n)
 241 {
 242         obj.set_mesh(index, &get_collection().get<Mesh>(n));
 243 }
 244
 245 void Object::LodLoader::mesh_inline()
 246 {
 247         RefPtr<Mesh> msh = new Mesh;
 248         load_sub(*msh);
 249         get_collection().add(format("%s/lod%d.mesh", FS::basename(get_source()), index), msh.get());
 250         lod.mesh = msh.release();
 251 }
 252
 253 void Object::LodLoader::technique(const string &n)
 254 {
 255         obj.set_technique(index, &get_collection().get<Technique>(n));
 256 }
 257
 258 void Object::LodLoader::technique_inline()
 259 {
 260         RefPtr<Technique> tech = new Technique;
 261         Technique::Loader ldr(*tech, get_collection());
 262         string name = format("%s/lod%d.tech", FS::basename(get_source()), index);
 263         ldr.set_inline_base_name(name);
 264         load_sub(*tech, get_collection());
 265         get_collection().add(name, tech.get());
 266         lod.technique = tech.release();
 267 }
 268
 269 } // namespace GL
 270 } // namespace Msp