PerlinTexture.h

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#ifndef PERLINTEXTURE_H
#define PERLINTEXTURE_H

#define PERLINTEXTURE_BASE_SIZE 32
#define PERLINTEXTURE_BASE_SQUARE PERLINTEXTURE_BASE_SIZE * \
  PERLINTEXTURE_BASE_SIZE
  
#define INTERPOLATE(a,b,x) \
  (a * (1 - x) + b * x)  

#define SCALE_INDEX(a) \
  (a % (scale * 32))
  
enum { NONE = 1, ONE = 2, TWO = 3, THREE = 4};

class PerlinTexture {
  public:
    PerlinTexture();
    inline unsigned char* get_scaled(unsigned char x, unsigned char y) {
      // x,y=0..255
      unsigned char xx, yy;
      xx = SCALE_INDEX(x);
      yy = SCALE_INDEX(y);
      return data + yy * xx + xx;
    }
    void refresh();
    int get_scale() { return scale; }
    void set_scale(int s) { scale = s; }
  private:
    unsigned char _gen_noise(unsigned char x, unsigned char y);
    unsigned char _smooth(unsigned char x, unsigned char y);
    int scale;
    unsigned char* data;
};

#endif

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