---

pbuffer.h

//FILE:     pbuffer.h
//AUTHOR:   Andrew Van Pernis <arakel@vr.clemson.edu>

#ifndef UBER_PBUFFER_H
#define UBER_PBUFFER_H 1

#include <string>
#include <GL/glx.h>
#include "texture.h"

namespace gl {
        class pixel_buffer;
}


class gl::pixel_buffer {
 protected:
  unsigned int m_width;    
  unsigned int m_height;   
  unsigned int m_bpp;      
  bool m_initialized;      
  bool m_error;            
  std::string m_error_msg; 
  gl::texture m_texture;   
#ifdef GLX_SGIX_fbconfig
#ifdef GLX_SGIX_pbuffer
  Display *m_display;                   
  GLXPbuffer m_pixel_buffer;            
  GLXContext m_pixel_buffer_context;    
  GLXFBConfigSGIX *m_available_configs; 
  int m_num_available_configs;          
#endif
#endif  

  inline void clear_error(void){
    m_error = false;
    m_error_msg = "none";
  }

  inline void set_error(const std::string& msg){
    m_error = true;
    m_error_msg = msg;
  }
  
 public:
  pixel_buffer(void): 
    m_initialized(false), m_error(false), m_error_msg("none")
    {
#ifdef GLX_SGIX_fbconfig
      m_available_configs = NULL;
      m_num_available_configs = 0;
#endif
    }

  virtual ~pixel_buffer(void){
#ifdef GLX_SGIX_fbconfig
    if (m_available_configs != NULL)
      delete(m_available_configs);
#endif
    if (m_initialized)
      shutdown();
  }


  virtual bool init(unsigned int w, unsigned int h, unsigned int bpp, GLXContext shared);


  virtual bool init(unsigned int w, unsigned int h, unsigned int bpp, const int attributes[], GLXContext shared);
   
  virtual void activate(void);


  virtual void shutdown(void);

  inline unsigned int get_width(void) const {
    return m_width;
  }

  inline unsigned int get_height(void) const {
    return m_height;
  }

  inline bool error(void) const {
    return m_error;
  }

  inline std::string get_error(void){
    std::string msg(m_error_msg);
    clear_error();
    return msg;
  }

  inline gl::texture get_texture(void) const {
    return m_texture;
  }

#ifdef GLX_SGIX_fbconfig

  static const int VISUAL_ATTRIBUTES_8BPP[];
  
  static const int VISUAL_ATTRIBUTES_16BPP[];
  
  static const int VISUAL_ATTRIBUTES_24BPP[];
  
  static const int VISUAL_ATTRIBUTES_32BPP[];

  static const int PIXEL_BUFFER_ATTRIBUTES[];
#endif
};

#endif

---