Compare images in fitness function and benchmark them

src/Fitness.hpp

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+#pragma once
+
+#include "Chromosome.hpp"
+#include <SFML/Graphics.hpp>
+
+
+
+class Fitness
+{
+public:
+	Fitness();
+	Fitness(sf::Texture target, float scale=0.5);
+	bool loadShader(std::string filename);
+	
+	double of(Chromosome chr);
+	
+	sf::Texture target;      // base image to compare against
+	sf::RenderTexture tex;   // big RenderWindow containg the Chromosome to be evaluated
+	sf::RenderTexture comp;  // smaller RenderWindow which is downloaded as Image
+	
+private:
+	sf::Sprite sprite;    // sprite to render tex to comp
+	sf::Shader compshdr;  // shader to perform pixel-wise image diff with
+	sf::View view;        // reduces tex to comp size while drawing
+};