textured_surface_material.cxx

#include "textured_surface_material.h"
#include <map>
#include <string>
 
namespace cgv {
    namespace media { 
        namespace illum { 
 
textured_surface_material::textured_surface_material(const obj_material& obj_mat) {
    name = obj_mat.name;
    brdf_type = BrdfType(BT_LAMBERTIAN + BT_PHONG);
    obj_material::color_type a = obj_mat.ambient, d = obj_mat.diffuse;
    float la = sqrt(a[0] * a[0] + a[1] * a[1] + a[2] * a[2]);
    float ld = sqrt(d[0] * d[0] + d[1] * d[1] + d[2] * d[2]);
    ambient_occlusion = la >= ld ? la : la / ld;
    diffuse_reflectance = obj_mat.diffuse;
    specular_reflectance = obj_mat.specular;
    emission = obj_mat.emission;
    roughness = std::max(0.0f, std::min(1.0f, 1.0f / (obj_mat.shininess + 0.992307f) - 0.0077524f));
    transparency = 1.0f - obj_mat.opacity;
    bump_scale = obj_mat.bump_scale;
 
    std::map<std::string, int> file_name_map;
 
    const auto& add_texture = [this, &file_name_map](const std::string& texture_file_name, int& texture_index) {
        if(!texture_file_name.empty()) {
            // Insert the texture file name and index into the map if it does not already exist.
            if(file_name_map.find(texture_file_name) == file_name_map.end())
                file_name_map[texture_file_name] = add_image_file(texture_file_name);
            // Get the index which is either the newly added index or an index from previous entries with the same texture name.
            texture_index = file_name_map[texture_file_name];
        }
    };
 
    add_texture(obj_mat.ambient_texture_name, ambient_index);
    add_texture(obj_mat.diffuse_texture_name, diffuse_index);
    add_texture(obj_mat.opacity_texture_name, transparency_index);
    add_texture(obj_mat.specular_texture_name, specular_index);
    add_texture(obj_mat.emission_texture_name, emission_index);
    add_texture(obj_mat.bump_texture_name, bump_index);
}
 
int textured_surface_material::add_image_file(const std::string& file_name) {
    int idx = static_cast<int>(image_file_names.size());
    image_file_names.push_back(file_name);
    return idx;
}
 
        }
    }
}