Setting up

src/resourcemanager.h

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+#pragma once 
+
+#include <map>
+#include <string>
+
+#include <glad/glad.h>
+
+#include "texture2d.h"
+#include "shader.h"
+
+
+// A static singleton ResourceManager class that hosts several
+// functions to load Textures and Shaders. Each loaded texture
+// and/or shader is also stored for future reference by string
+// handles. All functions and resources are static and no 
+// public constructor is defined.
+class ResourceManager
+{
+public:
+    // resource storage
+    static std::map<std::string, Shader>    Shaders;
+    static std::map<std::string, Texture2D> Textures;
+    // loads (and generates) a shader program from file loading vertex, fragment (and geometry) shader's source code. If gShaderFile is not nullptr, it also loads a geometry shader
+    static Shader    LoadShader(const char *vShaderFile, const char *fShaderFile, const char *gShaderFile, std::string name);
+    // retrieves a stored sader
+    static Shader    GetShader(std::string name);
+    // loads (and generates) a texture from file
+    static Texture2D LoadTexture(const char *file, bool alpha, std::string name);
+    // retrieves a stored texture
+    static Texture2D GetTexture(std::string name);
+    // properly de-allocates all loaded resources
+    static void      Clear();
+private:
+    // private constructor, that is we do not want any actual resource manager objects. Its members and functions should be publicly available (static).
+    ResourceManager() { }
+    // loads and generates a shader from file
+    static Shader    loadShaderFromFile(const char *vShaderFile, const char *fShaderFile, const char *gShaderFile = nullptr);
+    // loads a single texture from file
+    static Texture2D loadTextureFromFile(const char *file, bool alpha);
+};