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+/** @file common.h
+ * @brief Common items needed by most other files.
+ *
+ * This file contains headers, variables and functions that are needed in
+ * most other files included in this project.
+ */
+
+#ifndef COMMON_H
+#define COMMON_H
+
+// holy moly
+#include <iostream>
+#include <cstdlib>
+#include <string>
+#include <vector>
+#include <string>
+#include <fstream>
+#include <thread>
+#include <mutex>
+#include <future>
+#include <math.h>
+#include <threadpool.hpp>
+#include <algorithm>
+
+#define GLEW_STATIC
+#include <GL/glew.h>
+
+#include <SDL2/SDL.h>
+#include <SDL2/SDL_opengl.h>
+#include <SDL2/SDL_image.h>
+#include <SDL2/SDL_mixer.h>
+
+#ifdef __WIN32__
+typedef unsigned int uint;
+#undef near
+#endif
+
+/**
+ * This flag lets the compiler know that we want to use shaders.
+ */
+
+#define SHADERS
+
+template<typename N>
+N abso(N v){
+	if(v < 0){
+		return v * -1;
+	}else
+		return v;
+}
+
+template<class A>
+float averagef(A v){
+	float avg = 0;
+	for(auto &a : v){
+		avg += a;
+	}
+	avg /= v.size();
+	return avg;
+}
+
+
+extern GLuint colorIndex;	// Texture.cpp?
+
+/**
+ * This structure contains a set of coordinates for ease of coding.
+ */
+
+typedef struct {
+	int x;
+	int y;
+} ivec2;
+
+typedef struct {
+	float x;
+	float y;
+} vec2;
+
+typedef struct {
+	float x;
+	float y;
+	float z;
+} vec3;
+
+typedef ivec2 dim2;
+
+/**
+ * This structure contains two sets of coordinates for ray drawing.
+ */
+
+typedef struct {
+	vec2 start;
+	vec2 end;
+} Ray;
+
+struct col {
+	float red;
+	float green;
+	float blue;
+	col operator-=(float a){
+		red-=a;
+		green-=a;
+		blue-=a;
+		return{red+a,green+a,blue+a};
+	}
+	col operator+=(float a){
+		return{red+a,green+a,blue+a};
+	}
+	col operator=(float a){
+		return{red=a,green=a,blue=a};
+	}
+};
+
+typedef col Color;
+
+/**
+ * Define the game's name (displayed in the window title).
+ */
+
+#define GAME_NAME		"Independent Study v0.7 alpha - NOW WITH lights and snow and stuff"
+
+/**
+ * The desired width of the game window.
+ */
+
+extern unsigned int SCREEN_WIDTH;
+
+/**
+ * The desired height of the game window.
+ */
+
+extern unsigned int SCREEN_HEIGHT;
+
+extern bool FULLSCREEN;
+extern bool uiLoop;
+extern std::mutex mtx;
+
+/**
+ * Define the length of a single HLINE.
+ * The game has a great amount of elements that need to be drawn or detected, and having each
+ * of them use specific hard-coded numbers would be painful to debug. As a solution, this
+ * definition was made. Every item being drawn to the screen and most object detection/physic
+ * handling is done based off of this number. Increasing it will give the game a zoomed-in
+ * feel, while decreasing it will do the opposite.
+ *
+ */
+
+extern unsigned int HLINE;
+
+extern float VOLUME_MASTER;
+extern float VOLUME_MUSIC;
+extern float VOLUME_SFX;
+/**
+ * A 'wrapper' for libc's srand(), as we hope to eventually have our own random number
+ * generator.
+ */
+
+#define initRand(s) srand(s)
+
+/**
+ * A 'wrapper' for libc's rand(), as we hope to eventually have our own random number
+ * generator.
+ */
+
+#define getRand() rand()
+
+#define randGet     rand
+#define randInit    srand
+
+/**
+ * Included in common.h is a prototype for DEBUG_prints, which writes a formatted
+ * string to the console containing the callee's file and line number. This macro simplifies
+ * it to a simple printf call.
+ *
+ * DEBUG must be defined for this macro to function.
+ */
+
+#define DEBUG_printf( message, ...) DEBUG_prints(__FILE__, __LINE__, message, __VA_ARGS__ )
+#define C(x)						std::cout << x << std::endl;
+
+/**
+ * Defines pi for calculations that need it.
+ */
+
+#define PI 3.1415926535
+
+
+/**
+ * References the variable in main.cpp, used for smoother drawing.
+ */
+
+extern unsigned int deltaTime;
+
+/**
+ * References the variable in main.cpp, used for drawing with the player.
+ */
+
+extern vec2 offset;
+
+/**
+ * Counts the number of times logic() (see main.cpp) has been called, for animating
+ * sprites.
+ */
+extern unsigned int loops;
+
+extern GLuint shaderProgram;
+
+/**
+ *	Prints a formatted debug message to the console, along with the callee's file and line
+ *	number.
+ */
+
+void DEBUG_prints(const char* file, int line, const char *s,...);
+
+/**
+ * Sets color using glColor3ub(), but handles potential overflow.
+ */
+
+void safeSetColor(int r,int g,int b);
+
+/**
+ * Sets color using glColor4ub(), but handles potential overflow.
+ */
+
+void safeSetColorA(int r,int g,int b,int a);
+
+
+/**
+ * We've encountered many problems when attempting to create delays for triggering
+ * the logic function. As a result, we decided on using the timing libraries given
+ * by <chrono> in the standard C++ library. This function simply returns the amount
+ * of milliseconds that have passed since the epoch.
+ */
+
+#ifdef __WIN32__
+#define millis()	SDL_GetTicks()
+#else
+unsigned int millis(void);
+#endif // __WIN32__
+
+int getdir(const char *dir, std::vector<std::string> &files);
+void strVectorSortAlpha(std::vector<std::string> *v);
+
+const char *readFile(const char *path);
+
+int strCreateFunc(const char *equ);
+
+template<typename N, size_t s>
+size_t arrAmt(N (&)[s]){return s;}
+
+void UserError(std::string reason);
+
+#endif // COMMON_H