Added camera position to draw()

include/drawable.hpp

@@ -6,7 +6,7 @@ public:
 	Drawable() = default;
 	virtual ~Drawable() = default;
 
-	virtual void draw(glm::mat4 projection, glm::mat4 view, glm::mat4 model) = 0; //potentially pass the view matrix here
+	virtual void draw(glm::mat4 projection, glm::mat4 view, glm::mat4 model, glm::vec3 camera_pos) = 0;
 	virtual void upload() = 0;
 	virtual void unload() = 0;
 };
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