source/materials/pbrmaterial.cpp

   1 #include "framebuffer.h"
   2 #include "mesh.h"
   3 #include "pbrmaterial.h"
   4 #include "renderer.h"
   5 #include "resources.h"
   6 #include "texture2d.h"
   7
   8 using namespace std;
   9
  10 namespace Msp {
  11 namespace GL {
  12
  13 const Tag PbrMaterial::texture_tags[] =
  14 {
  15         Tag("base_color_map"),
  16         Tag("normal_map"),
  17         Tag("metalness_map"),
  18         Tag("roughness_map"),
  19         Tag("occlusion_map"),
  20         Tag("emission_map"),
  21         Tag("fresnel_lookup"),
  22         Tag()
  23 };
  24
  25 PbrMaterial::PbrMaterial():
  26         fresnel_lookup(get_or_create_fresnel_lookup()),
  27         fresnel_sampler(Resources::get_global().get<Sampler>("_linear_clamp.samp"))
  28 {
  29         set_base_color(0.8f);
  30         set_metalness(0.0f);
  31         set_roughness(0.5f);
  32         set_emission(0.0f);
  33 }
  34
  35 const Texture2D &PbrMaterial::get_or_create_fresnel_lookup()
  36 {
  37         Resources &resources = Resources::get_global();
  38
  39         static const string name = "_pbr_fresnel_lookup.tex";
  40         Texture2D *fresnel_lookup = resources.find<Texture2D>(name);
  41         if(fresnel_lookup)
  42                 return *fresnel_lookup;
  43
  44         fresnel_lookup = new Texture2D;
  45         fresnel_lookup->storage(RG8, 128, 128, 1);
  46         resources.add(name, fresnel_lookup);
  47
  48         const Program &shprog = resources.get<Program>("_pbr_fresnel_lookup.glsl.shader");
  49         ProgramData shdata;
  50         shdata.uniform("n_samples", 1024);
  51         // Not actually used here, but put it in to satisfy the interface
  52         shdata.uniform("roughness", 0.0f);
  53
  54         const Mesh &mesh = resources.get<Mesh>("_fullscreen_quad.mesh");
  55         Framebuffer fresnel_lookup_fbo((COLOR_ATTACHMENT,RG8));
  56         fresnel_lookup_fbo.attach(COLOR_ATTACHMENT, *fresnel_lookup);
  57         Renderer renderer;
  58         renderer.begin();
  59         renderer.set_framebuffer(&fresnel_lookup_fbo);
  60         renderer.set_shader_program(&shprog, &shdata);
  61         mesh.draw(renderer);
  62         renderer.end();
  63
  64         return *fresnel_lookup;
  65 }
  66
  67 void PbrMaterial::fill_program_info(string &module_name, map<string, int> &spec_values) const
  68 {
  69         module_name = "cooktorrance.glsl";
  70         spec_values["use_base_color_map"] = (base_color.texture!=0);
  71         spec_values["use_normal_map"] = (normal.texture!=0);
  72         spec_values["use_metalness_map"] = (metalness.texture!=0);
  73         spec_values["use_roughness_map"] = (roughness.texture!=0);
  74         spec_values["use_occlusion_map"] = (occlusion.texture!=0);
  75         bool use_emission = (emission.texture || emission.value.r || emission.value.g || emission.value.b);
  76         spec_values["use_emission"] = use_emission;
  77         spec_values["use_emission_map"] = (emission.texture!=0);
  78 }
  79
  80 const Texture *PbrMaterial::get_texture(Tag tag) const
  81 {
  82         if(tag==texture_tags[0])
  83                 return base_color.texture;
  84         else if(tag==texture_tags[1])
  85                 return normal.texture;
  86         else if(tag==texture_tags[2])
  87                 return metalness.texture;
  88         else if(tag==texture_tags[3])
  89                 return roughness.texture;
  90         else if(tag==texture_tags[4])
  91                 return occlusion.texture;
  92         else if(tag==texture_tags[5])
  93                 return emission.texture;
  94         else if(tag==texture_tags[6])
  95                 return &fresnel_lookup;
  96         else
  97                 return 0;
  98 }
  99
 100 const Sampler *PbrMaterial::get_sampler(Tag tag) const
 101 {
 102         if(tag==texture_tags[6])
 103                 return &fresnel_sampler;
 104         else
 105                 return sampler;
 106 }
 107
 108 void PbrMaterial::set_base_color(const Color &color)
 109 {
 110         base_color.value = color;
 111         shdata.uniform("pbr_material.base_color", color);
 112 }
 113
 114 void PbrMaterial::set_base_color_map(const Texture *tex)
 115 {
 116         base_color.texture = tex;
 117 }
 118
 119 void PbrMaterial::set_normal_map(const Texture *tex)
 120 {
 121         normal.texture = tex;
 122 }
 123
 124 void PbrMaterial::set_metalness(float value)
 125 {
 126         metalness.value = value;
 127         shdata.uniform("pbr_material.metalness", value);
 128 }
 129
 130 void PbrMaterial::set_metalness_map(const Texture *tex)
 131 {
 132         metalness.texture = tex;
 133 }
 134
 135 void PbrMaterial::set_roughness(float value)
 136 {
 137         roughness.value = value;
 138         shdata.uniform("pbr_material.roughness", value);
 139 }
 140
 141 void PbrMaterial::set_roughness_map(const Texture *tex)
 142 {
 143         roughness.texture = tex;
 144 }
 145
 146 void PbrMaterial::set_occlusion_map(const Texture *tex)
 147 {
 148         occlusion.texture = tex;
 149 }
 150
 151 void PbrMaterial::set_emission(const Color &color)
 152 {
 153         emission.value = color;
 154         shdata.uniform("pbr_material.emission", color);
 155 }
 156
 157 void PbrMaterial::set_emission_map(const Texture *tex)
 158 {
 159         emission.texture = tex;
 160 }
 161
 162
 163 DataFile::Loader::ActionMap PbrMaterial::Loader::shared_actions;
 164
 165 PbrMaterial::Loader::Loader(PbrMaterial &m, Collection &c):
 166         DerivedObjectLoader<PbrMaterial, Material::PropertyLoader<PbrMaterial> >(m, c)
 167 {
 168         set_actions(shared_actions);
 169 }
 170
 171 void PbrMaterial::Loader::init_actions()
 172 {
 173         Material::PropertyLoader<PbrMaterial>::init_actions();
 174         add_property("base_color", &PbrMaterial::set_base_color, &PbrMaterial::set_base_color_map, true);
 175         add_property("normal", &PbrMaterial::set_normal_map);
 176         add_property("metalness", &PbrMaterial::set_metalness, &PbrMaterial::set_metalness_map);
 177         add_property("roughness", &PbrMaterial::set_roughness, &PbrMaterial::set_roughness_map);
 178         add_property("occlusion", &PbrMaterial::set_occlusion_map);
 179         add_property("emission", &PbrMaterial::set_emission, &PbrMaterial::set_emission_map, false);
 180 }
 181
 182 } // namespace GL
 183 } // namespace Msp