volrendershader.h

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/* This software and supporting documentation are distributed by
 *     Institut Federatif de Recherche 49
 *     CEA/NeuroSpin, Batiment 145,
 *     91191 Gif-sur-Yvette cedex
 *     France
 *
 * This software is governed by the CeCILL-B license under
 * French law and abiding by the rules of distribution of free software.
 * You can  use, modify and/or redistribute the software under the
 * terms of the CeCILL-B license as circulated by CEA, CNRS
 * and INRIA at the following URL "http://www.cecill.info".
 *
 * As a counterpart to the access to the source code and  rights to copy,
 * modify and redistribute granted by the license, users are provided only
 * with a limited warranty  and the software's author,  the holder of the
 * economic rights,  and the successive licensors  have only  limited
 * liability.
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 */


#ifndef ANATOMIST_OBJECT_VOLRENDERSHADER_H
#define ANATOMIST_OBJECT_VOLRENDERSHADER_H

#include <anatomist/mobject/objectVector.h>
#include <anatomist/surface/glcomponent.h>

#if defined( GL_FRAMEBUFFER ) || defined( GL_FRAMEBUFFER_EXT )

namespace anatomist
{
  template<typename T> class AVolume;


  class VolRenderShader : public ObjectVector, public GLComponent
  {
  public:
    struct Private;

    VolRenderShader( AObject * vol );
    virtual ~VolRenderShader();

    virtual bool render( PrimList &, const ViewState & );
    virtual bool Is2DObject() { return true; }
    virtual bool Is3DObject() { return false; }
    virtual Tree* optionTree() const;
    virtual bool CanRemove( AObject * ) { return false; }

    void createDefaultPalette( const std::string & name = "" );
    virtual AObjectPalette* palette();
    virtual const AObjectPalette* palette() const;
    virtual void setPalette( const AObjectPalette &pal );
    virtual Material & GetMaterial();
    virtual const Material & material() const;
    virtual const Material* glMaterial() const;
    virtual void SetMaterial( const Material &mat );
    virtual bool isTransparent() const;
    virtual bool renderingIsObserverDependent() const;

    virtual void glSetChanged( glPart, bool = true ) const;
    virtual void glSetTexImageChanged( bool = true, unsigned tex = 0 ) const;
    virtual void glSetTexEnvChanged( bool = true, unsigned tex = 0 ) const;

    virtual const GLComponent* glAPI() const;
    virtual GLComponent* glAPI();
    virtual const AObjectPalette* glPalette( unsigned tex = 0 ) const;

    virtual unsigned glDimTex( const ViewState &, unsigned tex = 0 ) const;
    virtual bool glMakeTexImage( const ViewState &state,
                                 const GLTexture &gltex, unsigned tex ) const;
    virtual bool glMakeBodyGLL( const ViewState &state,
                                const GLList &gllist ) const;
    virtual const GLComponent::TexExtrema &
        glTexExtrema( unsigned tex = 0 ) const;
    virtual GLComponent::TexExtrema & glTexExtrema( unsigned tex = 0 );
    virtual void update(const Observable* observable, void* arg);

    bool checkObject() const;
    std::string shaderType() const;
    bool setShaderType( const std::string & );

    static int classType();

  protected:
    virtual std::string viewStateID( glPart part, const ViewState & ) const;

    void initializeShader();
    static std::string loadShaderFile( const std::string& filename );
    void genTextures();
    void loadTransferFunction();
    void createRenderTextures( int width, int height );
    void vertex( float x, float y, float z ) const;
    void drawQuads( float x, float y, float z ) const;

  private:
    Private *d;
  };

}


#endif
#endif