FBO.hh

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#ifndef ACG_FBO_HH
#define ACG_FBO_HH


//== INCLUDES =================================================================

#include <iostream>
#include <cstdlib>
#include <map>
#include <vector>

#include <ACG/Config/ACGDefines.hh>
#include <ACG/GL/gl.hh>

//== FORWARDDECLARATIONS ======================================================

//== NAMESPACES ===============================================================

namespace ACG {

//== CLASS DEFINITION =========================================================


class ACGDLLEXPORT FBO
{
public:
  
  // fbo_ braucht initialen Wert.
  FBO();
  
  ~FBO();
  
  void init();

  void del();

  GLsizei setMultisampling(GLsizei _samples, GLboolean _fixedsamplelocations = GL_TRUE);

  GLsizei getMultisamplingCount() const {return samples_;}

  void attachTexture( GLenum _attachment,
    GLuint _texture,
    GLuint _level = 0);

  void attachTexture2D( GLenum _attachment,
    GLsizei _width, GLsizei _height, 
    GLuint _internalFmt, GLenum _format, 
    GLint _wrapMode = GL_CLAMP_TO_EDGE,
    GLint _minFilter = GL_NEAREST,
    GLint _magFilter = GL_NEAREST);


  void attachTexture2D( GLenum _attachment, GLuint _texture, GLenum _target = GL_TEXTURE_2D );

  void attachTexture2DDepth( GLsizei _width, GLsizei _height, GLuint _internalFmt = GL_DEPTH_COMPONENT32, GLenum _format = GL_DEPTH_COMPONENT );

  void attachTexture2DStencil(GLsizei _width, GLsizei _height);

  void attachTexture3D( GLenum _attachment,
    GLsizei _width, GLsizei _height, GLsizei _depth,
    GLuint _internalFmt, GLenum _format,
    GLint _wrapMode = GL_CLAMP,
    GLint _minFilter = GL_NEAREST,
    GLint _magFilter = GL_NEAREST);

  void addDepthBuffer( GLuint _width, GLuint _height );
  
  void addStencilBuffer( GLuint _width, GLuint _height );

  void addDepthStencilBuffer( GLuint _width, GLuint _height );

  GLuint getAttachment( GLenum _attachment );

  GLuint getInternalFormat( GLenum _attachment );

  GLuint getFboID();

  void resize(GLsizei _width, GLsizei _height, bool _forceResize = false);

  GLsizei width() const {return width_;}

  GLsizei height() const {return height_;}

  ACG::Vec2i size() const {return ACG::Vec2i(width_, height_);}
  
  bool bind();
  
  void unbind();
  
  bool checkFramebufferStatus();

private:

  GLuint fbo_;

  GLuint depthbuffer_;
  
  GLuint stencilbuffer_;

  struct RenderTexture
  {
    RenderTexture();

    // opengl buf id
    GLuint id;

    // GL_TEXTURE_2D, GL_TEXTURE_2D_MULTISAMPLE..
    GLenum target;

    GLenum internalFormat, format, gltype;

    // tex dimension
    ACG::Vec3i dim;

    // common sampler params
    GLint wrapMode,
      minFilter,
      magFilter;

    // created by FBO class
    bool owner;
  };

  typedef std::map<GLenum, RenderTexture> AttachmentList;
  AttachmentList attachments_; // key: attachment index,  value: RenderTexture


  GLsizei width_, height_;

  GLsizei samples_;

  GLboolean fixedsamplelocation_;


  GLuint prevFbo_;
  GLuint prevDrawBuffer_;
};


//=============================================================================
} // namespace ACG
//=============================================================================
#endif // ACG_FBO_HH defined
//=============================================================================