Renderable.h

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/*
 *  Copyright (C) 2010 - 2015 Leonid Kostrykin
 *
 *  Chair of Medical Engineering (mediTEC)
 *  RWTH Aachen University
 *  Pauwelsstr. 20
 *  52074 Aachen
 *  Germany
 *
 */

#ifndef RENDERABLE_H_6014714286
#define RENDERABLE_H_6014714286

#include <Carna/Carna.h>
#include <Carna/base/GeometryFeature.h>
#include <Carna/base/math.h>

namespace Carna
{

namespace base
{



// ----------------------------------------------------------------------------------
// Renderable
// ----------------------------------------------------------------------------------

class CARNA_LIB Renderable
{

    struct Details;
    const std::unique_ptr< Details > pimpl;

public:

    Renderable( const Geometry& geometry, const math::Matrix4f& modelViewTransform );

    Renderable( const Renderable& other );

    ~Renderable();

    const Geometry& geometry() const;

    const math::Matrix4f& modelViewTransform() const;

    void setModelViewTransform( const math::Matrix4f& );

    const math::Matrix4f& viewModelTransform() const;

    float eyeDistance2() const;

    Renderable& operator=( const Renderable& other );

    template< int order >
    struct DepthOrder
    {
        const static bool isViewDependent = true;

        bool operator()( const Renderable& l, const Renderable& r ) const;
    };

    typedef DepthOrder< +1 > BackToFront;
    
    typedef DepthOrder< -1 > FrontToBack;

    template< unsigned int role >
    struct VideoResourcesOrder
    {
        const static bool isViewDependent = false;

        bool operator()( const Renderable& l, const Renderable& r ) const;
    };

}; // Renderable


template< int order >
bool Renderable::DepthOrder< order >::operator()( const Renderable& l, const Renderable& r ) const
{
    return order * ( l.eyeDistance2() - r.eyeDistance2() ) > 0;
}


template< unsigned int role >
bool Renderable::VideoResourcesOrder< role >::operator()( const Renderable& l, const Renderable& r ) const
{
    const GeometryFeature& gfl = l.geometry().feature( role );
    const GeometryFeature& gfr = r.geometry().feature( role );
    if( gfl.controlsSameVideoResource( gfr ) )
    {
        return false;
    }
    else
    {
        return &gfl < &gfr;
    }
}



}  // namespace Carna :: base

}  // namespace Carna

#endif // RENDERABLE_H_6014714286