FrameBuffer.h

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/* $Id: FrameBuffer.h,v 1.5 2002/09/26 09:28:16 cvs Exp $ */

#ifndef __FRAME_BUFFER_H
#define __FRAME_BUFFER_H

#include <gra/GRAObject.h>
#include <esg/Definitions.h>
#include <gra/camera/Camera.h>

/*
 * Frame-buffer "interface"
 */

using namespace esg;

namespace gra {
    
class GRA_EXPORT FrameBuffer : public GRAObject {
protected:
        unsigned _width;
        unsigned _height;
        unsigned _fbMode;
            
public:
        static const unsigned FB_RGBA    = (1 << 0); // RGB(A) mode, default
        static const unsigned FB_INDEX   = (1 << 1); // overrides FB_RGBA
        static const unsigned FB_SINGLE  = (1 << 2); // single buffer, default
        static const unsigned FB_DOUBLE  = (1 << 3); // overrides FB_SINGLE
        static const unsigned FB_DEPTH   = (1 << 4); // depth buffer
        
protected:
        void _sanitizeMode()
              {
                  if (_fbMode & (FB_RGBA|FB_INDEX))    _fbMode &= ~FB_RGBA;
                  if (_fbMode & (FB_SINGLE|FB_DOUBLE)) _fbMode &= ~FB_SINGLE;
                  if (!((_fbMode & FB_RGBA) || _fbMode & FB_INDEX))
                      _fbMode |= FB_RGBA;
                  if (!((_fbMode & FB_SINGLE) || _fbMode & FB_DOUBLE))
                      _fbMode |= FB_SINGLE;
              }
        
public:
        FrameBuffer(unsigned mode) : _width(0), _height(0), _fbMode(mode)
              {
                  _sanitizeMode();
              }

        FrameBuffer(unsigned width, unsigned height, unsigned mode)
            : _width(width), _height(height), _fbMode(mode)
              {
                  _sanitizeMode();
              }
    
        virtual ~FrameBuffer() {}

        virtual void showContent() {}
        
        virtual unsigned getWidth () const { return _width;  }
        virtual unsigned getHeight() const { return _height; }
        virtual void     setWidth (unsigned w) { _width  = w; }
        virtual void     setHeight(unsigned h) { _height = h; }
        
        virtual void setColor(const Camera&  /* camera */,
                              unsigned       /* posX   */,
                              unsigned       /* posY   */,
                              float          /* depth  */,
                              const Color3f& /* color  */) {}
        
        virtual void setColor(const Camera&  /* camera */,
                              unsigned       /* posX   */,
                              unsigned       /* posY   */,
                              const Color3f& /* color  */) {}
        
        virtual void setColors(const Camera&    /* camera */,
                               unsigned         /* posX   */,
                               unsigned         /* posY   */,
                               float            /* depth  */,
                               const Color3f [] /* colors */,
                               unsigned         /* size   */) {}
        
        virtual void setColors(const Camera&    /* camera */,
                               unsigned         /* posX   */,
                               unsigned         /* posY   */,
                               const Color3f [] /* colors */,
                               unsigned         /* size   */) {}
        
        virtual Color3f getColor(unsigned /* posX */,
                                 unsigned /* posY */) const
              {
                  return Color3f();
              }
        
        virtual void clearColor(const Color3f& /* color */) {}
};
    
} // namespace

#endif // __FRAME_BUFFER_H

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