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::setup_render(const ObjectPass &pass) const
  63 {
  64         if(!meshes[0])
  65                 throw InvalidState("Trying to render Object without mesh");
  66
  67         if(pass.shprog)
  68         {
  69                 pass.shprog->bind();
  70                 pass.shdata->apply();
  71                 for(unsigned i=0; i<textures.size(); ++i)
  72                 {
  73                         TexUnit::activate(i);
  74                         textures[i]->bind();
  75                 }
  76         }
  77         else if(main_texture && pass.use_textures)
  78                 main_texture->bind();
  79
  80         if(material)
  81                 material->apply();
  82 }
  83
  84 void Object::finish_render(const ObjectPass &pass) const
  85 {
  86         if(pass.shprog)
  87         {
  88                 Program::unbind();
  89                 for(unsigned i=textures.size(); i--;)
  90                 {
  91                         TexUnit::activate(i);
  92                         Texture::unbind();
  93                 }
  94         }
  95         else if(main_texture)
  96                 Texture::unbind();
  97 }
  98
  99 void Object::render(const ObjectPass &pass, const ObjectInstance *inst) const
 100 {
 101         setup_render(pass);
 102
 103         if(inst)
 104                 render_instance(pass, *inst);
 105         else
 106                 meshes[0]->draw();
 107
 108         finish_render(pass);
 109 }
 110
 111 void Object::render_instance(const ObjectPass &pass, const ObjectInstance &inst) const
 112 {
 113         inst.setup_render(pass);
 114         unsigned lod=min(inst.get_level_of_detail(), meshes.size()-1);
 115         meshes[lod]->draw();
 116         inst.finish_render(pass);
 117 }
 118
 119
 120 Object::Loader::Loader(Object &o, Collection &c):
 121         obj(o),
 122         coll(c)
 123 {
 124         add("lod_mesh", &Loader::lod_mesh);
 125         add("material", &Object::material);
 126         add("material_inline", &Loader::material_inline);
 127         add("mesh",     &Loader::mesh);
 128         add("pass",     &Loader::pass);
 129         add("shader",   &Loader::shader);
 130         add("shader_texture", &Loader::shader_texture);
 131         add("texture",  &Loader::texture);
 132 }
 133
 134 void Object::Loader::finish()
 135 {
 136         for(map<unsigned, ObjectPass>::iterator i=obj.passes.begin(); i!=obj.passes.end(); ++i)
 137                 if(i->second.shdata)
 138                 {
 139                         for(unsigned j=0; j<textures.size(); ++j)
 140                                 i->second.shdata->uniform(i->second.shprog->get_uniform_location(textures[j]), static_cast<int>(j));
 141                 }
 142 }
 143
 144 void Object::Loader::lod_mesh(unsigned l, const string &n)
 145 {
 146         obj.meshes.resize(l+1, 0);
 147         obj.meshes[l]=coll.get<Mesh>(n);
 148 }
 149
 150 void Object::Loader::material_inline()
 151 {
 152         RefPtr<Material> mat=new Material;
 153         load_sub(*mat);
 154         coll.add(format("%p%p", &obj, mat.get()), mat.get());
 155         obj.material=mat.release();
 156 }
 157
 158 void Object::Loader::mesh(const string &n)
 159 {
 160         obj.meshes[0]=coll.get<Mesh>(n);
 161 }
 162
 163 void Object::Loader::pass(const string &n)
 164 {
 165         unsigned id=Tag(n).id;
 166         if(obj.passes.count(id))
 167                 throw KeyError("Duplicate pass name");
 168         ObjectPass p;
 169         load_sub(p, coll);
 170         obj.passes[id]=p;
 171 }
 172
 173 void Object::Loader::shader(const string &n)
 174 {
 175         Program *shprog=coll.get<Program>(n);
 176         if(shprog)  // Allow for unsupported shaders
 177         {
 178                 RefPtr<ProgramData> shdata=new ProgramData;
 179                 load_sub(*shdata, *shprog);
 180
 181                 obj.normal_pass->shprog=shprog;
 182                 if(obj.normal_pass->shdata)
 183                         delete obj.normal_pass->shdata;
 184                 obj.normal_pass->shdata=shdata.release();
 185         }
 186 }
 187
 188 void Object::Loader::shader_texture(const string &n)
 189 {
 190         unsigned eqsign=n.find('=');
 191         if(eqsign!=string::npos)
 192         {
 193                 obj.textures.push_back(coll.get<Texture>(n.substr(eqsign+1)));
 194                 textures.push_back(n.substr(0, eqsign));
 195         }
 196         else
 197         {
 198                 obj.textures.push_back(coll.get<Texture>(n));
 199                 textures.push_back(n);
 200         }
 201 }
 202
 203 void Object::Loader::texture(const string &n)
 204 {
 205         if(obj.main_texture)
 206                 throw Exception("Only one main texture may be specified");
 207
 208         obj.main_texture=coll.get<Texture>(n);
 209         obj.textures.push_back(obj.main_texture);
 210         textures.push_back("texture");
 211 }
 212
 213 } // namespace GL
 214 } // namespace Msp