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// ************************************************************************* //
//                       avtOpenGLSLIVRVolumeRenderer.h                      //
// ************************************************************************* //

#ifndef AVT_OPEN_GL_SLIVR_VOLUME_RENDERER_H
#define AVT_OPEN_GL_SLIVR_VOLUME_RENDERER_H
#include <visit-config.h>
#ifdef HAVE_LIBSLIVR
#include <avtVolumeRendererImplementation.h>
#include <vector>

#include <VolumeAttributes.h>

#include <slivr/Texture.h>
#include <slivr/ColorMap.h>
#include <slivr/ColorMap2.h>
#include <slivr/VolumeRenderer.h>

class vtkRectilinearGrid;

// ****************************************************************************
//  Class avtOpenGLSLIVRVolumeRenderer
//
//  Purpose
//      An implementation of a volume renderer that uses the SLIVR library.
//
//  Programmer Brad Whitlock
//  Creation   Fri Aug 17 17:55:44 PST 2007
//
//  Modifications:
//    Brad Whitlock, Wed Apr 22 12:09:09 PDT 2009
//    I changed the interface.
//
// ****************************************************************************

class avtOpenGLSLIVRVolumeRenderer : public avtVolumeRendererImplementation
{
public:
                            avtOpenGLSLIVRVolumeRenderer();
    virtual                ~avtOpenGLSLIVRVolumeRenderer();

protected:
    virtual void            Render(const RenderProperties &props, const VolumeData &volume);
    struct SlivrContext
    {
        SlivrContext();
        ~SlivrContext();

        Nrrd                            *data;
        Nrrd                            *gm_data;
        SLIVR::Texture                  *tex;
        SLIVR::ColorMap                 *cm;
        SLIVR::VolumeRenderer           *renderer;
        std::vector<SLIVR::ColorMap2 *>  cmap2;
        Nrrd                            *cmap2_image;
        std::vector<SLIVR::Plane *>      planes;
    };

    void             FreeContext();
    void             CreateColormap(const VolumeAttributes &atts, bool &);
    void             CheckContext(SlivrContext* context,
                                  const VolumeAttributes &atts);
    void             CreateContext(vtkRectilinearGrid *grid, 
                                   vtkDataArray *data, 
                                   vtkDataArray *opac, 
                                   const VolumeAttributes &atts, 
                                   float vmin, float vmax, 
                                   float omin, float omax, float *gmn);
    bool             OnlyLightingFlagIsDifferent(const VolumeAttributes &lhs,
                                                 const VolumeAttributes &rhs) const;

    static bool      slivrInit;
    SlivrContext    *context;
    VolumeAttributes oldAtts;
    int              videoCardMemorySize;
};

#endif
#endif
