Skybox.h

#ifndef _SKYBOX_H_
#define _SKYBOX_H_

#define GLFW_INCLUDE_GLEXT
#ifdef __APPLE__
#define GLFW_INCLUDE_GLCOREARB
#else
#include <GL/glew.h>
#endif
#include <GLFW/glfw3.h>
// Use of degrees is deprecated. Use radians instead.
#ifndef GLM_FORCE_RADIANS
#define GLM_FORCE_RADIANS
#endif
#include <glm/mat4x4.hpp>
#include <glm/gtc/matrix_transform.hpp>

class Skybox
{
public:
	Skybox();
	Skybox(float mult);
	~Skybox();

	glm::mat4 toWorld;

	void initialize();
	void draw(GLuint);
	void sendLight(GLuint shaderProgram);

	// Cubemap
	GLuint loadCubemap();
	GLuint textureID;

	// These variables are needed for the shader program
	GLuint VBO, VAO, EBO;
	GLuint uProjection, uModelview, uModel, uView;

	GLfloat vertices[8][3] = {
		// "Front" vertices
		{ -2.0, -2.0,  2.0 },{ 2.0, -2.0,  2.0 },{ 2.0,  2.0,  2.0 },{ -2.0,  2.0,  2.0 },
		// "Back" vertices
		{ -2.0, -2.0, -2.0 },{ 2.0, -2.0, -2.0 },{ 2.0,  2.0, -2.0 },{ -2.0,  2.0, -2.0 }
	};
};

// Note that GL_QUADS is deprecated in modern OpenGL (and removed from OSX systems).
// This is why we need to draw each face as 2 triangles instead of 1 quadrilateral
const GLuint indices[6][6] = {
	// Front face
	{0, 1, 2, 2, 3, 0},
	// Top face
	{1, 5, 6, 6, 2, 1},
	// Back face
	{7, 6, 5, 5, 4, 7},
	// Bottom face
	{4, 0, 3, 3, 7, 4},
	// Left face
	{4, 5, 1, 1, 0, 4},
	// Right face
	{3, 2, 6, 6, 7, 3}
};

#endif