scene.cpp

//
// this provide functions to set up the scene
//

// GLM lib for matrix calculation
#include "include/glm/glm.hpp"
#include "include/glm/gtc/matrix_transform.hpp"
#include "include/glm/gtc/type_ptr.hpp"

#include "object.h"
#include <cstdio>

// light 1 position and color
extern glm::vec3 light1;
extern glm::vec3 light1_ambient;
extern glm::vec3 light1_diffuse;
extern glm::vec3 light1_specular;

// global ambient term
extern glm::vec3 global_ambient;

extern Object *scene;

extern glm::vec3 background_clr;
extern float decay_a;
extern float decay_b;
extern float decay_c;

//////////////////////////////////////////////////////////////////////////

/*******************************************
 * set up the default scene 
 *******************************************/
void set_up_default_scene() {
    // set background color
    background_clr =  glm::vec3(0.5,0.05,0.8);

    // setup global ambient term
    global_ambient = glm::vec3(0.2,0.2,0.2);

    // setup light 1
    light1 = glm::vec3(-2.0,5.0,1.0);
    light1_ambient = glm::vec3(0.1,0.1,0.1);
    light1_diffuse = glm::vec3(1.0,1.0,1.0);
    light1_specular = glm::vec3(1.0,1.0,1.0);

    // set up decay parameters
    decay_a = 0.5;
    decay_b = 0.3;
    decay_c = 0.0;

    // sphere 1
    glm::vec3 sphere1_ambient = glm::vec3(0.7, 0.7, 0.7);
    glm::vec3 sphere1_diffuse = glm::vec3(0.1, 0.5, 0.8);
    glm::vec3 sphere1_specular = glm::vec3(1.0, 1.0, 1.0);
    float sphere1_shineness = 10;
    float sphere1_reflectance = 0.4;

    glm::vec3 sphere1_ctr = glm::vec3(1.5, -0.2, -3.2);
    float sphere1_rad = 1.23;

    addSphere(1,sphere1_ambient, sphere1_diffuse, sphere1_specular, sphere1_shineness,
        sphere1_reflectance,sphere1_ctr, sphere1_rad);

    // sphere 2
    glm::vec3 sphere2_ambient = glm::vec3(0.6, 0.6, 0.6);
    glm::vec3 sphere2_diffuse = glm::vec3(1.0, 0.0, 0.25);
    glm::vec3 sphere2_specular = glm::vec3(1.0, 1.0, 1.0);
    float sphere2_shineness = 6;
    float sphere2_reflectance = 0.3;

    glm::vec3 sphere2_ctr = glm::vec3(-1.5, 0.0, -3.5);
    float sphere2_rad = 1.5;

    addSphere(2, sphere2_ambient, sphere2_diffuse, sphere2_specular, sphere2_shineness,
        sphere2_reflectance, sphere2_ctr, sphere2_rad);

    // sphere 3
    glm::vec3 sphere3_ambient = glm::vec3(0.2, 0.2, 0.2);
    glm::vec3 sphere3_diffuse = glm::vec3(0.0, 1.0, 0.25);
    glm::vec3 sphere3_specular = glm::vec3(0.0, 1.0, 0.0);
    float sphere3_shineness = 30;
    float sphere3_reflectance = 0.3;

    glm::vec3 sphere3_ctr = glm::vec3(-0.35, 1.75, -2.25);
    float sphere3_rad = 0.5;

    addSphere(3, sphere3_ambient, sphere3_diffuse, sphere3_specular, sphere3_shineness,
        sphere3_reflectance, sphere3_ctr, sphere3_rad);
}

/***************************************
 * You can create your own scene here
 ***************************************/
void set_up_user_scene() {
   // set background color
    background_clr =  glm::vec3(0.5,0.05,0.8);

    // setup global ambient term
    global_ambient = glm::vec3(0.2,0.2,0.2);

    // setup light 1
    light1 = glm::vec3(-2.0,5.0,1.0);
    light1_ambient = glm::vec3(0.1,0.1,0.1);
    light1_diffuse = glm::vec3(1.0,1.0,1.0);
    light1_specular = glm::vec3(1.0,1.0,1.0);

    // set up decay parameters
    decay_a = 0.5;
    decay_b = 0.3;
    decay_c = 0.0;

    // sphere 1
    glm::vec3 sphere1_ambient = glm::vec3(0.7, 0.7, 0.7);
    glm::vec3 sphere1_diffuse = glm::vec3(0.1, 0.5, 0.8);
    glm::vec3 sphere1_specular = glm::vec3(1.0, 1.0, 1.0);
    float sphere1_shineness = 10;
    float sphere1_reflectance = 0.4;

    glm::vec3 sphere1_ctr = glm::vec3(1.5, -0.2, -3.2);
    float sphere1_rad = 1.23;

    bool sphere1_refract = true;
    float sphere1_refractivity = 1.5;
    float sphere1_refractance = 1.0;

    addSphere(1,sphere1_ambient, sphere1_diffuse, sphere1_specular, sphere1_shineness,
        sphere1_reflectance,sphere1_ctr, sphere1_rad, sphere1_refract, sphere1_refractivity, sphere1_refractance);

    // sphere 2
    glm::vec3 sphere2_ambient = glm::vec3(0.6, 0.6, 0.6);
    glm::vec3 sphere2_diffuse = glm::vec3(1.0, 0.0, 0.25);
    glm::vec3 sphere2_specular = glm::vec3(1.0, 1.0, 1.0);
    float sphere2_shineness = 6;
    float sphere2_reflectance = 0.3;

    glm::vec3 sphere2_ctr = glm::vec3(-1.5, 0.0, -3.5);
    float sphere2_rad = 1.5;

    bool sphere2_refract = true;
    float sphere2_refractivity = 2;
    float sphere2_refractance = 1.0;

    addSphere(2, sphere2_ambient, sphere2_diffuse, sphere2_specular, sphere2_shineness,
        sphere2_reflectance, sphere2_ctr, sphere2_rad, sphere2_refract, sphere2_refractivity, sphere2_refractance);

    // sphere 3
    glm::vec3 sphere3_ambient = glm::vec3(0.2, 0.2, 0.2);
    glm::vec3 sphere3_diffuse = glm::vec3(0.0, 1.0, 0.25);
    glm::vec3 sphere3_specular = glm::vec3(0.0, 1.0, 0.0);
    float sphere3_shineness = 30;
    float sphere3_reflectance = 0.3;

    glm::vec3 sphere3_ctr = glm::vec3(-0.35, 1.75, -2.25);
    float sphere3_rad = 0.5;

    bool sphere3_refract = true;
    float sphere3_refractivity = 1.5;
    float sphere3_refractance = 0.5;

    addSphere(3, sphere3_ambient, sphere3_diffuse, sphere3_specular, sphere3_shineness,
        sphere3_reflectance, sphere3_ctr, sphere3_rad, sphere3_refract, sphere3_refractivity, sphere3_refractance);
}


/*******************************************
 * set up the chessboard 
 *******************************************/
void set_up_chessboard(){

    glm::vec3 mat_ambient = glm::vec3(0.1, 0.1, 0.1);
    glm::vec3 mat_diffuse = glm::vec3(0,0,0);
    glm::vec3 mat_specular = glm::vec3(1.0, 1.0, 1.0);
    float  mat_shineness = 40;

    float reflectance = 1.0;

    glm::vec3 center = glm::vec3(0.0, -2.0, -3.5);
    glm::vec3 normal = glm::vec3(0,1,0);
    glm::vec3 Xaxis = glm::vec3(1,0,0);

    int Xlen = 8;
    int Ylen = 8;

    addPlane(4,mat_ambient, mat_diffuse, mat_specular, mat_shineness, reflectance, 
        center,normal,Xaxis,Xlen,Ylen);

}