obj.hpp

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/*
 * COPYRIGHT (c) 2017 John Reppy (http://cs.uchicago.edu/~jhr)
 * All rights reserved.
 */
 
#ifndef _OBJ_HXX_
#define _OBJ_HXX_
 
#include "cs237.hpp"
 
namespace OBJ {
 
enum {
    NoLight = 0,                
    Diffuse = 1,                
    Specular = 2                
    /* 3    Reflection on and Ray trace on */
    /* 4    Transparency: Glass on
        Reflection: Ray trace on */
    /* 5    Reflection: Fresnel on and Ray trace on */
    /* 6    Transparency: Refraction on
        Reflection: Fresnel off and Ray trace on */
    /* 7    Transparency: Refraction on
        Reflection: Fresnel on and Ray trace on */
    /* 8    Reflection on and Ray trace off */
    /* 9    Transparency: Glass on
        Reflection: Ray trace off */
    /* 10   Casts shadows onto invisible surfaces */
};
 
enum {
    DefaultComponent = 0,       
    UniformComponent = 1,       
    MapComponent = 2            
};
 
struct Material {
    std::string         name;           
    int                 illum;          
    int                 ambientC;       
    int                 emissiveC;      
    int                 diffuseC;       
    int                 specularC;      
    glm::vec3           ambient;        
    glm::vec3           emissive;       
    glm::vec3           diffuse;        
    glm::vec3           specular;       
    float               shininess;      
    std::string         ambientMap;     
    std::string         emissiveMap;    
    std::string         diffuseMap;     
    std::string         specularMap;    
    std::string         normalMap;      
}; // struct Material
 
struct Group {
    std::string         name;           
    int                 material;       
    uint32_t            nVerts;         
    uint32_t            nIndices;       
    glm::vec3           *verts;         
    glm::vec3           *norms;         
    glm::vec2           *txtCoords;     
    uint32_t            *indices;       
}; // struct Group
 
class Model {
  public:
 
    Model (std::string filename);
    ~Model ();
 
    const cs237::AABBf_t &bounds () const { return this->_bbox; }
 
    int numMaterials () const { return this->_materials.size(); }
    const OBJ::Material & material (int i) const { return this->_materials[i]; }
 
    int numGroups () const { return this->_groups.size(); }
    const OBJ::Group & group (int i) const { return this->_groups[i]; }
    std::vector<OBJ::Group>::const_iterator beginGroups () const { return this->_groups.begin(); }
    std::vector<OBJ::Group>::const_iterator endGroups () const { return this->_groups.end(); }
 
  private:
    std::string         _path;          
    std::string         _mtlLibName;    
    cs237::AABBf_t      _bbox;          
 
    std::vector<OBJ::Material> _materials;
    std::vector<OBJ::Group> _groups;
 
  // read a material library
    bool readMaterial (std::string m);
 
}; // class Model
 
} // namespace OBJ
 
#endif // !_OBJ_HXX_