source/technique.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 "material.h"
  10 #include "program.h"
  11 #include "programdata.h"
  12 #include "tag.h"
  13 #include "technique.h"
  14 #include "texture.h"
  15
  16 using namespace std;
  17
  18 namespace Msp {
  19 namespace GL {
  20
  21 Technique::Technique():
  22         main_texture(0),
  23         normal_pass(&passes[0]),
  24         material(0)
  25 { }
  26
  27 Technique::~Technique()
  28 {
  29         for(map<unsigned, ObjectPass>::iterator i=passes.begin(); i!=passes.end(); ++i)
  30                 delete i->second.shdata;
  31 }
  32
  33 bool Technique::has_pass(const GL::Tag &tag) const
  34 {
  35         return passes.count(tag.id);
  36 }
  37
  38 const ObjectPass &Technique::get_pass(const GL::Tag &tag) const
  39 {
  40         map<unsigned, ObjectPass>::const_iterator i=passes.find(tag.id);
  41         if(i==passes.end())
  42                 throw KeyError("Unknown pass");
  43         return i->second;
  44 }
  45
  46 unsigned Technique::get_texture_index(const std::string &n) const
  47 {
  48         for(unsigned i=0; i<tex_names.size(); ++i)
  49                 if(tex_names[i]==n)
  50                         return i;
  51
  52         throw KeyError("Unknown texture slot", n);
  53 }
  54
  55 const Texture *Technique::get_texture(unsigned i) const
  56 {
  57         if(i>=textures.size())
  58                 throw KeyError("Texture index out of range");
  59
  60         return textures[i];
  61 }
  62
  63
  64 Technique::Loader::Loader(Technique &t, Collection &c):
  65         tech(t),
  66         coll(c)
  67 {
  68         add("material",        &Technique::material);
  69         add("material_inline", &Loader::material_inline);
  70         add("pass",            &Loader::pass);
  71         add("shader",          &Loader::shader);
  72         add("shader_texture",  &Loader::shader_texture);
  73         add("texture",         &Loader::texture);
  74         add("texture_slot",    &Loader::texture_slot);
  75 }
  76
  77 void Technique::Loader::finish()
  78 {
  79         for(map<unsigned, ObjectPass>::iterator i=tech.passes.begin(); i!=tech.passes.end(); ++i)
  80                 if(i->second.shdata)
  81                 {
  82                         for(unsigned j=0; j<tech.textures.size(); ++j)
  83                                 i->second.shdata->uniform(i->second.shprog->get_uniform_location(tech.tex_names[j]), static_cast<int>(j));
  84                 }
  85 }
  86
  87 void Technique::Loader::material_inline()
  88 {
  89         RefPtr<Material> mat=new Material;
  90         load_sub(*mat);
  91         coll.add(format("_%p", mat.get()), mat.get());
  92         tech.material=mat.release();
  93 }
  94
  95 void Technique::Loader::pass(const string &n)
  96 {
  97         unsigned id=Tag(n).id;
  98         if(tech.passes.count(id))
  99                 throw KeyError("Duplicate pass name", n);
 100         ObjectPass p;
 101         load_sub(p, coll);
 102         tech.passes[id]=p;
 103 }
 104
 105 void Technique::Loader::shader(const string &n)
 106 {
 107         Program *shprog=coll.get<Program>(n);
 108         if(shprog)  // Allow for unsupported shaders
 109         {
 110                 RefPtr<ProgramData> shdata=new ProgramData;
 111                 load_sub(*shdata, *shprog);
 112
 113                 tech.normal_pass->shprog=shprog;
 114                 if(tech.normal_pass->shdata)
 115                         delete tech.normal_pass->shdata;
 116                 tech.normal_pass->shdata=shdata.release();
 117         }
 118 }
 119
 120 void Technique::Loader::shader_texture(const string &n)
 121 {
 122         string::size_type eqsign=n.find('=');
 123         if(eqsign!=string::npos)
 124         {
 125                 tech.textures.push_back(coll.get<Texture>(n.substr(eqsign+1)));
 126                 tech.tex_names.push_back(n.substr(0, eqsign));
 127         }
 128         else
 129         {
 130                 tech.textures.push_back(coll.get<Texture>(n));
 131                 tech.tex_names.push_back(n);
 132         }
 133 }
 134
 135 void Technique::Loader::texture(const string &n)
 136 {
 137         if(tech.main_texture)
 138                 throw Exception("Only one main texture may be specified");
 139
 140         tech.main_texture=coll.get<Texture>(n);
 141         tech.textures.push_back(tech.main_texture);
 142         tech.tex_names.push_back("texture");
 143 }
 144
 145 void Technique::Loader::texture_slot(const string &n)
 146 {
 147         tech.tex_names.push_back(n);
 148         tech.textures.push_back(0);
 149 }
 150
 151 } // namespace GL
 152 } // namespace Msp