niotso/Client/Scene/Scene.hpp

/*
    Niotso - Copyright (C) 2012 Fatbag <X-Fi6@phppoll.org>

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

class Scene {
    const float TickPeriod;
    float TimeDelta;
    virtual int Run(float TimeDelta) = 0;

  protected:
    Scene(float c) : TickPeriod(c), TimeDelta(0) {}

  public:
    int RunFor(float TimeDelta) {
        if(TickPeriod == 0){
            return Run(TimeDelta);
        }
        
        bool Redraw = false;
        this->TimeDelta += TimeDelta;
        while(this->TimeDelta >= 0){
            int result = Run(TickPeriod);
            if(result == System::SHUTDOWN)
                return System::SHUTDOWN;
            if(result > 0) Redraw = true;
            this->TimeDelta -= TickPeriod;
        }
        return (Redraw) ? 1 : -1;
    }
    
    virtual void Render() = 0;
};

class LoginScreen : public Scene {
  public: LoginScreen() : Scene(1.0f/15) {}

  private:
    int Run(float){
        if(System::UserInput.CloseWindow){
            System::Shutdown = true;
            return 0;
        }
        return 1;
    }

  public:
    void Render(){
    }
};