rawVolModel.h

/* Copyright (c) 2007       Maxim Makhinya
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 * - Neither the name of Eyescale Software GmbH nor the names of its
 *   contributors may be used to endorse or promote products derived from this
 *   software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef EVOLVE_RAW_VOL_MODEL_H
#define EVOLVE_RAW_VOL_MODEL_H

#include <eq/eq.h>

namespace eVolve
{

    struct DataInTextureDimensions
    {
        float W;    
        float H;    
        float D;    
        float Do;   
        float Db;   
    };

    struct VolumeScaling
    {
        float W;    
        float H;    
        float D;    
    };

    struct VolumeInfo
    {
        GLuint                  volume;     
        GLuint                  preint;     
        VolumeScaling           volScaling; 
        VolumeScaling           voxelSize;  
        DataInTextureDimensions TD; 
        bool                    hasDerivatives; 
    };

    class RawVolumeModel
    {
    public:
        RawVolumeModel( const std::string& filename );

        bool loadHeader( const float brightness, const float alpha );

        bool getVolumeInfo( VolumeInfo& info, const eq::Range& range );

        void releaseVolumeInfo( const eq::Range& range );

        const std::string&   getFileName()      const { return _filename;    };
              uint32_t       getResolution()    const { return _resolution;  };
        const VolumeScaling& getVolumeScaling() const { return _volScaling;  };

        void glewSetContext( const GLEWContext* context )
            { _glewContext = context; }

        const GLEWContext* glewGetContext() const { return _glewContext; }

    protected:

        bool _createVolumeTexture(    GLuint&                  volume,
                                      DataInTextureDimensions& TD,
                                const eq::Range&               range );

    private:
        bool _lFailed( char* msg )
            { LBERROR << msg << std::endl; return false; }

        struct VolumePart
        {
            GLuint                  volume; 
            DataInTextureDimensions TD;     
        };

        stde::hash_map< int32_t, VolumePart > _volumeHash; 

        bool         _headerLoaded;     
        std::string  _filename;         

        GLuint       _preintName;       

        uint32_t     _w;                
        uint32_t     _h;                
        uint32_t     _d;                
        uint32_t     _tW;               
        uint32_t     _tH;               
        uint32_t     _tD;               
        uint32_t     _resolution;       

        VolumeScaling _volScaling;      

        std::vector< uint8_t >  _TF;    

        bool _hasDerivatives;           

        const GLEWContext*   _glewContext;    
    };

}

#endif // EVOLVE_RAW_VOL_MODEL_H