TextureFunction.h

#ifndef TEXTURE_FUNCTION_H
#define TEXTURE_FUNCTION_H

/*
** ---------------------------------------------------------------
** Includes:
*/
#include "RenderContext.h"

/*
** ---------------------------------------------------------------
** Definitions:
*/

#define TMAP_TILE 1
#define TMAP_CLAMP 3


#include "geom.h"
#include "color.h"
#include "poly.h"
#include "hpoly.h"
#include "shade.h"
#include "lang.h"

#define TEX_MAXPAR 6

#define TEX_W 0
#define TEX_T 1
#define TEX_P 2
#define TEX_N 3
#define TEX_U 4 
#define TEX_V 5



class TextureFunction {

public :
        virtual Color &texture(const Vector3 &t) const = 0;
};



class ImageTexture : public TextureFunction {

public :
        
        ImageTexture(const Image &i);
        virtual Color &texture(const Vector3 &t) const;

        static Val parse(int pass, Pval *pl);

private :

        Image &img;
};


typedef struct ChequerInfo {
  Real xfreq, yfreq;
  Color fg, bg;
} ChequerInfo;


class ChequerTexture : public TextureFunction {

public :
        
        ChequerTexture(Real xfreq, Real yfreq,const Color &a,const Color &b,const Vector3 &t);

        virtual Color &texture(const Vector3 &t) const;

        static Val parse(int pass, Pval *pl);

protected :

        Color  chequer(Real xfreq, Real yfreq, const Color &a, const Color &b, const Vector3 &t)

private :

        ChequerInfo &c;
};


#endif //TEXTURE_FUNCTION_H

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