getting uniform locations once, at the renderer creation, not everytime

[demo] / src / renderer.h

#ifndef RENDERER_H_
#define RENDERER_H_

class OrbitCamera;
class Object;
class Scene;
class ShaderProgram;

class Renderer {
protected:
        int diff_loc;
        int spec_loc;
        int shin_loc;
        int mmviewproj_loc;
        int mview_loc;

        ShaderProgram *sprog;
        virtual void draw_object(Object *object) const;

public:
        Scene *scene;
        OrbitCamera *camera;

        Renderer();
        virtual ~Renderer();

        virtual bool create();
        virtual void draw() const;
};

#endif // RENDERER_H_