CSE167/Light.cpp at master · JFHwang/CSE167 · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
#include "Light.h"
#include "Window.h"
#include <iostream>

#ifdef __APPLE__
    #include <GLUT/glut.h>
#else
    #include <GL/glut.h>
#endif


Light::Light()
{
    ambientColor = Color::ambientDefault();
    diffuseColor = Color::diffuseDefault();
    specularColor = Color::specularDefault();
    constantAttenuation = 1.0;
    linearAttenuation = 0.0;
    quadraticAttenuation = 0.05;
	angle = 0;
	exponent = 0;
}

Light::~Light()
{
    //Delete any dynamically allocated memory/objects here
}

void Light::bind(int id)
{
	if (position[3] == 0) {
		glLightfv(GL_LIGHT0, GL_AMBIENT, ambientColor.ptr());
		glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuseColor.ptr());
		glLightfv(GL_LIGHT0, GL_POSITION, position.ptr());

		//Remember to use constant attenuation
		glLightfv(GL_LIGHT0, GL_CONSTANT_ATTENUATION, &constantAttenuation);


	}
	//It's a point light!
	else if (angle == 0 && exponent == 0) {
		glLightfv(GL_LIGHT1, GL_AMBIENT, ambientColor.ptr());
		glLightfv(GL_LIGHT1, GL_DIFFUSE, diffuseColor.ptr());
		glLightfv(GL_LIGHT1, GL_POSITION, position.ptr());
		glLightfv(GL_LIGHT1, GL_QUADRATIC_ATTENUATION, &quadraticAttenuation);
	}
	//It's a spot light!
	else {
		Vector4 negation = Vector4(-position[0], -position[1], -position[2], -position[3]);
		glLightfv(GL_LIGHT2, GL_AMBIENT, ambientColor.ptr());
		glLightfv(GL_LIGHT2, GL_DIFFUSE, diffuseColor.ptr());
		glLightfv(GL_LIGHT2, GL_POSITION, position.ptr());
		glLightf(GL_LIGHT2, GL_SPOT_EXPONENT, exponent);
		glLightf(GL_LIGHT2, GL_SPOT_CUTOFF, angle);
		glLightfv(GL_LIGHT2, GL_QUADRATIC_ATTENUATION, &quadraticAttenuation);
		glLightfv(GL_LIGHT2, GL_SPOT_DIRECTION, negation.ptr());
	}

    if(id < 0 || id > 7) {
        std::cout << "ERROR: The light bind ID " << id << " is not valid!" << std::endl;
        return;
    }

    //Set the bindID
    bindID = id;

    //Configure the light at the bindID
    glEnable(GL_LIGHT0 + bindID);

    //Configure the color of the light
    glLightfv(GL_LIGHT0 + bindID, GL_AMBIENT, ambientColor.ptr());
    glLightfv(GL_LIGHT0 + bindID, GL_DIFFUSE, diffuseColor.ptr());
    glLightfv(GL_LIGHT0 + bindID, GL_SPECULAR, specularColor.ptr());

    //Configure the attenuation properties of the light
    //Add support for Constant Attenuation
    //Add support for Linear Attenuation
    glLightf(GL_LIGHT0 + bindID, GL_QUADRATIC_ATTENUATION, quadraticAttenuation);

    //Position the light
    glLightfv(GL_LIGHT0 + bindID, GL_POSITION, position.ptr());

    //Setup spotlight direction, angle, and exponent here

}

void Light::unbind(void)
{
    glDisable(GL_LIGHT0 + bindID);
    bindID = -1;
}