voxel-raycaster/include/util.hpp

#pragma once
#include <SFML/Graphics.hpp>
#include <iostream>
#include <math.h>
#include <fstream>
#include <sstream>
#include "Vector4.hpp"

const double PI = 3.141592653589793238463;
const float  PI_F = 3.14159265358979f;

struct Light {
	sf::Vector4f rgbi;

	// I believe that Vector3's get padded to Vector4's. Give them a non-garbage value
	sf::Vector3f position;

	sf::Vector3f direction_cartesian;
};

struct fps_counter {
public:
	fps_counter(){
		if(!f.loadFromFile("../assets/fonts/Arial.ttf")){
				std::cout << "couldn't find the fall back Arial font in ../assets/fonts/" << std::endl;
		} else {
				t.setFont(f);
		}
	}

	void frame(double delta_time){
		if (frame_count == 100){
			frame_count = 0;
			fps_average = 0;
		}
			frame_count++;
			fps_average += (delta_time - fps_average) / frame_count;
	}

	void flip_units() {
		if (milliseconds)
			milliseconds = false;
		else
			milliseconds = true;
	}
		
	void draw(sf::RenderWindow *r){
		
		std::string out;

		if (milliseconds)
			out = std::to_string(fps_average);
		else
			out = std::to_string(floor(1 / fps_average));

		t.setString(out);
			r->draw(t);
	}

private:
	bool milliseconds = false;
	sf::Font f;
	sf::Text t;
	int frame_count = 0;
	double fps_average = 0;
};

struct debug_text {
public:
	debug_text(int slot, int pixel_spacing, void* data_, std::string prefix_) : data(data_), prefix(prefix_) {
		if (!f.loadFromFile("../assets/fonts/Arial.ttf")) {
			std::cout << "couldn't find the fall back Arial font in ../assets/fonts/" << std::endl;
		}
		else {
			t.setFont(f);
			t.setCharacterSize(20);
			t.setPosition(static_cast<float>(20), static_cast<float>(slot * pixel_spacing));
		}

	}

	void draw(sf::RenderWindow *r) {
		t.setString(prefix + std::to_string(*(float*)data));
		r->draw(t);
	}

private:
	void* data;
	std::string prefix;
	sf::Font f;
	sf::Text t;

};

inline sf::Vector3f SphereToCart(sf::Vector2f i) {

	auto r = sf::Vector3f(
		(1 * sin(i.y) * cos(i.x)),
		(1 * sin(i.y) * sin(i.x)),
		(1 * cos(i.y))
		);
	return r;
};

inline sf::Vector3f SphereToCart(sf::Vector3f i) {

	auto r = sf::Vector3f(
		(i.x * sin(i.z) * cos(i.y)),
		(i.x * sin(i.z) * sin(i.y)),
		(i.x * cos(i.z))
		);
	return r;
};


inline sf::Vector3f CartToSphere(sf::Vector3f in) {

	auto r = sf::Vector3f(
		sqrt(in.x * in.x + in.y * in.y + in.z * in.z),
		atan(in.y / in.x),
		atan(sqrt(in.x * in.x + in.y * in.y) / in.z)
		);
	return r;
};


inline sf::Vector3f Normalize(sf::Vector3f in) {
	
	float multiplier = sqrt(in.x * in.x + in.y * in.y + in.z * in.z);
	auto r = sf::Vector3f(
		in.x / multiplier,
		in.y / multiplier,
		in.z / multiplier
	);
	return r;

}


inline float DotProduct(sf::Vector3f a, sf::Vector3f b){
	return a.x * b.x + a.y * b.y + a.z * b.z;
}

inline float Magnitude(sf::Vector3f in){
	return sqrt(in.x * in.x + in.y * in.y + in.z * in.z);
}

inline float AngleBetweenVectors(sf::Vector3f a, sf::Vector3f b){
	return acos(DotProduct(a, b) / (Magnitude(a) * Magnitude(b)));
}

inline float DegreesToRadians(float in) {
	return static_cast<float>(in * PI / 180.0f);
}

inline float RadiansToDegrees(float in) {
	return static_cast<float>(in * 180.0f / PI);
}

inline std::string read_file(std::string file_name){
	std::ifstream input_file(file_name);

	if (!input_file.is_open()){
		std::cout << file_name << " could not be opened" << std::endl;
		return "";
	}

	std::stringstream buf;
	buf << input_file.rdbuf();
	input_file.close();
	return buf.str();
}