texture.h

#ifndef TEXTUREH
#define TEXTUREH 

#include "perlin.h"

class texture  {
    public:
        virtual vec3 value(float u, float v, const vec3& p) const = 0;
};

class constant_texture : public texture {
    public:
        constant_texture() { }
        constant_texture(vec3 c) : color(c) { }
        virtual vec3 value(float u, float v, const vec3& p) const {
            return color;
        }
        vec3 color;
};

class checker_texture : public texture {
    public:
        checker_texture() { }
        checker_texture(texture *t0, texture *t1): even(t0), odd(t1) { }
        virtual vec3 value(float u, float v, const vec3& p) const {
            float sines = sin(10*p.x())*sin(10*p.y())*sin(10*p.z());
            if (sines < 0)
                return odd->value(u, v, p);
            else
                return even->value(u, v, p);
        }
        texture *odd;
        texture *even;
};


class noise_texture : public texture {
    public:
        noise_texture() {}
        noise_texture(float sc) : scale(sc) {}
        virtual vec3 value(float u, float v, const vec3& p) const {
//            return vec3(1,1,1)*0.5*(1 + noise.turb(scale * p));
//            return vec3(1,1,1)*noise.turb(scale * p);
              return vec3(1,1,1)*0.5*(1 + sin(scale*p.x() + 5*noise.turb(scale*p))) ;
        }
        perlin noise;
        float scale;
};

#endif