source/renderpass.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/core/refptr.h>
   9 #include <msp/datafile/collection.h>
  10 #include <msp/strings/formatter.h>
  11 #include "material.h"
  12 #include "renderpass.h"
  13 #include "program.h"
  14 #include "programdata.h"
  15 #include "texture.h"
  16
  17 using namespace std;
  18
  19 namespace Msp {
  20 namespace GL {
  21
  22 RenderPass::RenderPass():
  23         shprog(0),
  24         shdata(0),
  25         own_material(false),
  26         material(0)
  27 { }
  28
  29 RenderPass::RenderPass(const RenderPass &other):
  30         shprog(other.shprog),
  31         shdata(other.shdata ? new ProgramData(*other.shdata) : 0),
  32         own_material(other.own_material),
  33         material(own_material ? new Material(*other.material) : other.material),
  34         textures(other.textures)
  35 { }
  36
  37 RenderPass::~RenderPass()
  38 {
  39         delete shdata;
  40         if(own_material)
  41                 delete material;
  42 }
  43
  44 void RenderPass::set_material(const Material *mat)
  45 {
  46         material = mat;
  47 }
  48
  49 unsigned RenderPass::get_texture_index(const string &slot) const
  50 {
  51         for(unsigned i=0; i<textures.size(); ++i)
  52                 if(textures[i].name==slot)
  53                         return i;
  54
  55         throw KeyError("Unknown texture slot", slot);
  56 }
  57
  58 void RenderPass::set_texture(const string &slot, const Texture *tex)
  59 {
  60         textures[get_texture_index(slot)] = tex;
  61 }
  62
  63 void RenderPass::bind() const
  64 {
  65         const RenderPass *old = current();
  66         if(!set_current(this))
  67                 return;
  68
  69         if(shprog)
  70         {
  71                 shprog->bind();
  72                 shdata->apply();
  73         }
  74         else if(old && old->shprog)
  75                 GL::Program::unbind();
  76
  77         if(material)
  78                 material->bind();
  79         else if(old && old->material)
  80                 GL::Material::unbind();
  81
  82         for(unsigned i=0; i<textures.size(); ++i)
  83                 if(textures[i].texture)
  84                         textures[i].texture->bind_to(i);
  85         if(old)
  86         {
  87                 for(unsigned i=textures.size(); i<old->textures.size(); ++i)
  88                         GL::Texture::unbind_from(i);
  89         }
  90 }
  91
  92 void RenderPass::unbind()
  93 {
  94         const RenderPass *old = current();
  95         if(!set_current(0))
  96                 return;
  97
  98         if(old->shprog)
  99                 GL::Program::unbind();
 100
 101         if(old->material)
 102                 GL::Material::unbind();
 103
 104         for(unsigned i=old->textures.size(); i--; )
 105                 GL::Texture::unbind_from(i);
 106 }
 107
 108
 109 RenderPass::Loader::Loader(RenderPass &p):
 110         DataFile::CollectionObjectLoader<RenderPass>(p, 0)
 111 {
 112         init();
 113 }
 114
 115 RenderPass::Loader::Loader(RenderPass &p, Collection &c):
 116         DataFile::CollectionObjectLoader<RenderPass>(p, &c)
 117 {
 118         init();
 119 }
 120
 121 void RenderPass::Loader::init()
 122 {
 123         allow_pointer_reload = false;
 124
 125         add("shader",   &RenderPass::shprog);
 126         add("material", &Loader::material);
 127         add("material", &RenderPass::material);
 128         add("texture",  &Loader::texture);
 129         add("uniforms", &Loader::uniforms);
 130 }
 131
 132 void RenderPass::Loader::finish()
 133 {
 134         if(obj.shprog)
 135         {
 136                 if(!obj.shdata)
 137                         obj.shdata = new ProgramData;
 138
 139                 for(unsigned i=0; i<obj.textures.size(); ++i)
 140                 {
 141                         unsigned loc = obj.shprog->get_uniform_location(obj.textures[i].name);
 142                         obj.shdata->uniform(loc, static_cast<int>(i));
 143                 }
 144         }
 145 }
 146
 147 void RenderPass::Loader::material()
 148 {
 149         if(obj.material)
 150                 throw InvalidState("A material is already loaded");
 151
 152         RefPtr<Material> mat = new Material;
 153         load_sub(*mat);
 154         obj.material = mat.release();
 155         obj.own_material = true;
 156 }
 157
 158 void RenderPass::Loader::texture(const string &n)
 159 {
 160         const Texture *tex = (n.empty() ? 0 : get_collection().get<Texture>(n));
 161         TextureSlot slot(tex);
 162         slot.name = (obj.textures.empty() ? "texture" : format("texture%d", obj.textures.size()));
 163         load_sub(slot);
 164         obj.textures.push_back(slot);
 165 }
 166
 167 void RenderPass::Loader::uniforms()
 168 {
 169         if(!obj.shprog)
 170                 throw InvalidState("Can't load uniforms without a shader program");
 171         if(!obj.shdata)
 172                 obj.shdata = new ProgramData;
 173         load_sub(*obj.shdata, *obj.shprog);
 174 }
 175
 176
 177 RenderPass::TextureSlot::TextureSlot(const Texture *t):
 178         texture(t)
 179 { }
 180
 181
 182 RenderPass::TextureSlot::Loader::Loader(TextureSlot &s):
 183         DataFile::ObjectLoader<TextureSlot>(s)
 184 {
 185         add("name", &TextureSlot::name);
 186 }
 187
 188 } // namespace GL
 189 } // namespace Msp