texCoordGen.h

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//////////////////////////////////////////////////////////////////////
// 6/29/02      Aaron Lefohn    Scientific Computing and Imaging Institute
// School of Computing          University of Utah
//////////////////////////////////////////////////////////////////////
//
// MultiTexCoordGen - A "mixin" interface that specifies texture coordinate 
//                                        generation for Multiple texture units.
//                                                
// TexCoordGen - Functor Interface that specifies texture coordinate 
//                               generation for a Single texture unit. 
// 
//////////////////////////////////////////////////////////////////////

#ifndef GLIFT_MULTI_TEX_COORD_GEN
#define GLIFT_MULTI_TEX_COORD_GEN

#include "../core/gliftObject.h"
#include "../util/gliftDecl.h"
#include <mathGutz.h>
#include <arrayGutz.h>

#include <vector>

namespace glift {

typedef std::vector<gutz::arrayw2f>     Vecarrayw2f;
typedef std::vector<gutz::arrayo2f> MultiTexCoord;
typedef std::vector<MultiTexCoord*> MultiPrimTexCoord;

class _export_ MultiTexCoordGen
{
public:
        virtual MultiTexCoord* genTexCoords( const gutz::arrayw2f& rawTexCoord, const gutz::vec3f& primScale ) const = 0;
};

class _export_ TexCoordGen : public GliftObject
{
public:
        virtual ~TexCoordGen() {}

        /// Generate tex-coords from scratch with no vertex info
        virtual gutz::arrayo2f operator()() = 0;                                         

        /// Usage 1: Generate tex-coords from scratch based on vertices and dimensions of primitive
        /// Usage 2: Perturb existing texture coordinates.
        /// Default implementation returns empty gutz::arrayo2f
        virtual gutz::arrayo2f operator()( const gutz::arrayw2f& coords, const gutz::vec3f& dimen ); 
        
        /// Alternate interface
        gutz::arrayo2f genTexCoords() { return (*this)(); }
        gutz::arrayo2f genTexCoords( const gutz::arrayw2f coords, const gutz::vec3f& dimen ) { return (*this)(coords, dimen); }
};

} /// End of namespace glift

#endif

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