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<textures.size(); ++i)
  49                 if(textures[i].name==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].texture;
  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                         {
  84                                 unsigned loc=i->second.shprog->get_uniform_location(tech.textures[j].name);
  85                                 i->second.shdata->uniform(loc, static_cast<int>(j));
  86                         }
  87                 }
  88 }
  89
  90 void Technique::Loader::material_inline()
  91 {
  92         RefPtr<Material> mat=new Material;
  93         load_sub(*mat);
  94         coll.add(format("_%p", mat.get()), mat.get());
  95         tech.material=mat.release();
  96 }
  97
  98 void Technique::Loader::pass(const string &n)
  99 {
 100         unsigned id=Tag(n).id;
 101         if(tech.passes.count(id))
 102                 throw KeyError("Duplicate pass name", n);
 103         ObjectPass p;
 104         load_sub(p, coll);
 105         tech.passes[id]=p;
 106 }
 107
 108 void Technique::Loader::shader(const string &n)
 109 {
 110         Program *shprog=coll.get<Program>(n);
 111         if(shprog)  // Allow for unsupported shaders
 112         {
 113                 RefPtr<ProgramData> shdata=new ProgramData;
 114                 load_sub(*shdata, *shprog);
 115
 116                 tech.normal_pass->shprog=shprog;
 117                 if(tech.normal_pass->shdata)
 118                         delete tech.normal_pass->shdata;
 119                 tech.normal_pass->shdata=shdata.release();
 120         }
 121 }
 122
 123 void Technique::Loader::shader_texture(const string &n)
 124 {
 125         string::size_type eqsign=n.find('=');
 126         TextureSlot tex;
 127         if(eqsign!=string::npos)
 128         {
 129                 tex.name=n.substr(0, eqsign);
 130                 tex.texture=coll.get<Texture>(n.substr(eqsign+1));
 131         }
 132         else
 133         {
 134                 string::size_type dot=n.rfind('.');
 135                 tex.name=n.substr(0, dot);
 136                 tex.texture = coll.get<Texture>(n);
 137         }
 138         for(string::iterator i=tex.name.begin(); i!=tex.name.end(); ++i)
 139                 if(!isalnum(*i))
 140                         *i='_';
 141         tech.textures.push_back(tex);
 142 }
 143
 144 void Technique::Loader::texture(const string &n)
 145 {
 146         if(tech.main_texture)
 147                 throw Exception("Only one main texture may be specified");
 148
 149         tech.main_texture=coll.get<Texture>(n);
 150         TextureSlot tex;
 151         tex.name="texture";
 152         tex.texture=tech.main_texture;
 153         tech.textures.push_back(tex);
 154 }
 155
 156 void Technique::Loader::texture_slot(const string &n)
 157 {
 158         TextureSlot tex;
 159         tex.name=n;
 160         tech.textures.push_back(tex);
 161 }
 162
 163 } // namespace GL
 164 } // namespace Msp