const char* read_from_file(const GLchar* shader_path)
{
    std::string shader_code;
    std::ifstream shader_file;

    shader_file.exceptions (std::ifstream::failbit | std::ifstream::badbit);

    try
    {
        // open files
        shader_file.open(shader_path);
        std::stringstream shader_stream;

        // read file's buffer contents into streams
        shader_stream << shader_file.rdbuf();

        shader_file.close();

        // convert stream into string
        shader_code = shader_stream.str();
    }
    catch(std::ifstream::failure &e)
    {
        std::cout << "ERROR: Shader file not succesfully read. Check path to shader source file!" << std::endl;
    };

    const char* final_shader_code = shader_code.c_str();

    return final_shader_code;
};