source/object.cpp

   1 /* $Id$
   2
   3 This file is part of libmspgl
   4 Copyright © 2007  Mikko Rasa, Mikkosoft Productions
   5 Distributed under the LGPL
   6 */
   7
   8 #include <msp/strings/formatter.h>
   9 #include "except.h"
  10 #include "material.h"
  11 #include "mesh.h"
  12 #include "object.h"
  13 #include "objectinstance.h"
  14 #include "objectpass.h"
  15 #include "program.h"
  16 #include "programdata.h"
  17 #include "texture.h"
  18 #include "texunit.h"
  19
  20 using namespace std;
  21
  22 namespace Msp {
  23 namespace GL {
  24
  25 Object::Object():
  26         meshes(1, static_cast<Mesh *>(0)),
  27         main_texture(0),
  28         material(0)
  29 {
  30         normal_pass=&passes[0];
  31 }
  32
  33 Object::~Object()
  34 {
  35         for(map<unsigned, ObjectPass>::iterator i=passes.begin(); i!=passes.end(); ++i)
  36                 delete i->second.shdata;
  37 }
  38
  39 bool Object::has_pass(const Tag &tag) const
  40 {
  41         return passes.count(tag.id);
  42 }
  43
  44 const ObjectPass &Object::get_pass(const Tag &tag) const
  45 {
  46         map<unsigned, ObjectPass>::const_iterator i=passes.find(tag.id);
  47         if(i==passes.end())
  48                 throw KeyError("Unknown pass");
  49         return i->second;
  50 }
  51
  52 void Object::render(const Tag &tag) const
  53 {
  54         render(get_pass(tag), 0);
  55 }
  56
  57 void Object::render(const ObjectInstance &inst, const Tag &tag) const
  58 {
  59         render(get_pass(tag), &inst);
  60 }
  61
  62 void Object::render(const list<const ObjectInstance *> &insts, const Tag &tag) const
  63 {
  64         render(get_pass(tag), insts);
  65 }
  66
  67 void Object::setup_render(const ObjectPass &pass) const
  68 {
  69         if(!meshes[0])
  70                 throw InvalidState("Trying to render Object without mesh");
  71
  72         if(pass.shprog)
  73         {
  74                 pass.shprog->bind();
  75                 pass.shdata->apply();
  76                 for(unsigned i=0; i<textures.size(); ++i)
  77                 {
  78                         TexUnit::activate(i);
  79                         textures[i]->bind();
  80                 }
  81         }
  82         else if(main_texture)
  83                 main_texture->bind();
  84
  85         if(material)
  86                 material->apply();
  87 }
  88
  89 void Object::finish_render(const ObjectPass &pass) const
  90 {
  91         if(pass.shprog)
  92         {
  93                 Program::unbind();
  94                 for(unsigned i=textures.size(); i--;)
  95                 {
  96                         TexUnit::activate(i);
  97                         Texture::unbind();
  98                 }
  99         }
 100         else if(main_texture)
 101                 Texture::unbind();
 102 }
 103
 104 void Object::render(const ObjectPass &pass, const ObjectInstance *inst) const
 105 {
 106         setup_render(pass);
 107
 108         unsigned lod=0;
 109         if(inst)
 110         {
 111                 inst->setup_render(pass);
 112                 lod=min(inst->get_level_of_detail(), meshes.size()-1);
 113         }
 114
 115         meshes[lod]->draw();
 116
 117         if(inst)
 118                 inst->finish_render(pass);
 119
 120         finish_render(pass);
 121 }
 122
 123 void Object::render(const ObjectPass &pass, const list<const ObjectInstance *> &insts) const
 124 {
 125         setup_render(pass);
 126
 127         for(list<const ObjectInstance *>::const_iterator i=insts.begin(); i!=insts.end(); ++i)
 128         {
 129                 (*i)->setup_render(pass);
 130
 131                 unsigned lod=min((*i)->get_level_of_detail(), meshes.size()-1);
 132                 meshes[lod]->draw();
 133
 134                 (*i)->finish_render(pass);
 135         }
 136
 137         finish_render(pass);
 138 }
 139
 140
 141 Object::Loader::Loader(Object &o, Collection &c):
 142         obj(o),
 143         coll(c)
 144 {
 145         add("lod_mesh", &Loader::lod_mesh);
 146         add("material", &Object::material);
 147         add("material_inline", &Loader::material_inline);
 148         add("mesh",     &Loader::mesh);
 149         add("pass",     &Loader::pass);
 150         add("shader",   &Loader::shader);
 151         add("shader_texture", &Loader::shader_texture);
 152         add("texture",  &Loader::texture);
 153 }
 154
 155 void Object::Loader::finish()
 156 {
 157         for(map<unsigned, ObjectPass>::iterator i=obj.passes.begin(); i!=obj.passes.end(); ++i)
 158                 if(i->second.shdata)
 159                 {
 160                         for(unsigned j=0; j<textures.size(); ++j)
 161                                 i->second.shdata->uniform(i->second.shprog->get_uniform_location(textures[j]), static_cast<int>(j));
 162                 }
 163 }
 164
 165 void Object::Loader::lod_mesh(unsigned l, const string &n)
 166 {
 167         obj.meshes.resize(l+1, 0);
 168         obj.meshes[l]=coll.get<Mesh>(n);
 169 }
 170
 171 void Object::Loader::material_inline()
 172 {
 173         RefPtr<Material> mat=new Material;
 174         load_sub(*mat);
 175         coll.add(format("%p%p", &obj, mat.get()), mat.get());
 176         obj.material=mat.release();
 177 }
 178
 179 void Object::Loader::mesh(const string &n)
 180 {
 181         obj.meshes[0]=coll.get<Mesh>(n);
 182 }
 183
 184 void Object::Loader::pass(const string &n)
 185 {
 186         unsigned id=Tag(n).id;
 187         if(obj.passes.count(id))
 188                 throw KeyError("Duplicate pass name");
 189         ObjectPass p;
 190         load_sub(p, coll);
 191         obj.passes[id]=p;
 192 }
 193
 194 void Object::Loader::shader(const string &n)
 195 {
 196         Program *shprog=coll.get<Program>(n);
 197         if(shprog)  // Allow for unsupported shaders
 198         {
 199                 RefPtr<ProgramData> shdata=new ProgramData;
 200                 load_sub(*shdata, *shprog);
 201
 202                 obj.normal_pass->shprog=shprog;
 203                 if(obj.normal_pass->shdata)
 204                         delete obj.normal_pass->shdata;
 205                 obj.normal_pass->shdata=shdata.release();
 206         }
 207 }
 208
 209 void Object::Loader::shader_texture(const string &n)
 210 {
 211         unsigned eqsign=n.find('=');
 212         if(eqsign!=string::npos)
 213         {
 214                 obj.textures.push_back(coll.get<Texture>(n.substr(eqsign+1)));
 215                 textures.push_back(n.substr(0, eqsign));
 216         }
 217         else
 218         {
 219                 obj.textures.push_back(coll.get<Texture>(n));
 220                 textures.push_back(n);
 221         }
 222 }
 223
 224 void Object::Loader::texture(const string &n)
 225 {
 226         if(obj.main_texture)
 227                 throw Exception("Only one main texture may be specified");
 228
 229         obj.main_texture=coll.get<Texture>(n);
 230         obj.textures.push_back(obj.main_texture);
 231         textures.push_back("texture");
 232 }
 233
 234 } // namespace GL
 235 } // namespace Msp