// Copyright (C) 2010, Guy Barrand. All rights reserved.
// See the file tools.license for terms.

#ifndef tools_offscreen_session
#define tools_offscreen_session

namespace tools {
namespace offscreen {

class viewer {
public:
  virtual ~viewer() {}
public:
  virtual void render() = 0;
};

}}

#include "../forit"
#include "../vmanip"

#include <ostream>

namespace tools {
namespace offscreen {

class session {
public:
  session(std::ostream& a_out):m_out(a_out) {}
  virtual ~session() {}
protected:
  session(const session& a_from):m_out(a_from.m_out) {}
  session& operator=(const session& a_from) {if(&a_from==this) return *this;return *this;}
public:
  std::ostream& out() const {return m_out;}
  bool is_valid() const {return true;}
  bool steer() {
    tools_vforcit(viewer*,m_to_render,it) {(*it)->render();}
    m_to_render.clear();
    return true;
  }
  bool sync() {
    tools_vforcit(viewer*,m_to_render,it) {(*it)->render();}
    m_to_render.clear();
    return true;
  }
public:
  void to_render(viewer* a_viewer) {
    if(is_inp(m_to_render,a_viewer)) return;
    m_to_render.push_back(a_viewer);
  }
protected:
  std::ostream& m_out;
  std::vector<viewer*> m_to_render;  
};

}}

#endif