rt_parse.h

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#ifndef _RT_PARSE_H_
#define _RT_PARSE_H_

#include "rt_vectors.h"
#include <vector>

/**********************************************/
/* You need to define and write these classes */
/**********************************************/
class rt_Light;
class rt_Object;
class rt_Group;
class rt_Sphere;
class rt_Triangle;
class rt_TriMesh;
class rt_Material;

/* For parsing purposes */
#define MAX_PARSER_TOKEN_LENGTH 100

class rt_parse
{
public:

    rt_parse();
    
    rt_parse(const char *filename);

    ~rt_parse();

    Vec3f getBackgroundColor() { return background_color; }

    Vec3f getAmbientLight() { return ambient_light; }

    int getNumLights() { return (int)(lights.size()); }

    int getNumMaterials() { return (int)(materials.size()); }

    rt_Light* getLight(unsigned int i)
    {
        if((i < 0) || (i >= lights.size()))
        {
          cout<<"ERROR: request for light "<<i<<", which is outside "<<
                "acceptable indices. There are "<<lights.size()<<" lights.\n";
          exit(-1);
        }
        rt_Light *result = lights[i];
        assert(result != NULL);
        return result;
    }

    rt_Material* getMaterial(unsigned int i)
    {
        if((i < 0) || (i >= materials.size()))
        {
          cout<<"ERROR: request for material "<<i<<", which is outside "<<
                "acceptable indices. There are "<<lights.size()<<" lights.\n";
          exit(-1);
        }
        rt_Material *result = materials[i];
        assert (result != NULL);
        return result;
    }

    rt_Group* getGroup()
    {
        return group;
    }
    
    Vec3f getEye() { return eye; }
        
    Vec3f getCenter() { return center; }
        
    Vec3f getUp() { return up; }
        
    float getFovy() { return fovy; }

private:

    void rt_parse_initialize();

    void eatWhitespace(void);

    int getToken(char token[MAX_PARSER_TOKEN_LENGTH]);

    Vec3f readVec3f();

    float readFloat();

    int readInt();

    void parseFile();
    
    void parseBackground();
    
    void parseLights();
    
    void parseCamera();
    
    void parseMaterials();
    
    void parseMaterialIndex();
    
    rt_Group* parseGroup();
    
    rt_Sphere* parseSphere();
    
    rt_Triangle* parseTriangle();
    
    rt_TriMesh* parseTriMesh();

    /* Private data members for class rt_parse */
    rt_Group *group; 
    Vec3f background_color; 
    Vec3f ambient_light;    
    Vec3f eye;              
    Vec3f center;           
    Vec3f up;               
    float fovy;             
    FILE *file;     
    int parse_char; 
    int curline;    
    std::vector<rt_Light *> lights; 
    std::vector<rt_Material *> materials; 
    rt_Material *current_material; 
};

#endif

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