combine_texture.h

// Description: Point-wise combination of two textures
// Documentation: modifier_textures.txt

#ifndef PASTELGFX_COMBINE_TEXTURE_H
#define PASTELGFX_COMBINE_TEXTURE_H

#include "pastel/gfx/texture/texture.h"
#include "pastel/gfx/color/colormixer.h"

namespace Pastel
{

    template <typename Type, integer N = 2>
    class Combine_Texture
        : public Texture<Type, N>
    {
    public:
        Combine_Texture(
            const Texture<Type, N>& aTexture,
            const Texture<Type, N>& bTexture,
            const ColorMixer<Type>& colorMixer)
            : aTexture_(aTexture)
            , bTexture_(bTexture)
            , colorMixer_(colorMixer)
        {
        }

        virtual ~Combine_Texture()
        {
        }

        virtual Type operator()(
            const Vector<real, N>& p,
            const Matrix<real>& m) const
        {
            return colorMixer_(
                aTexture_(p, m),
                bTexture_(p, m));
        }

        virtual std::string name() const
        {
            return std::string("Combine(" + aTexture_.fullName() + 
                ", " + bTexture_.fullName() + ")");
        }

    private:
        const Texture<Type, N>& aTexture_;
        const Texture<Type, N>& bTexture_;
        const ColorMixer<Type>& colorMixer_;
    };

    template <typename Type, integer N>
    Combine_Texture<Type, N> combineTexture(
        const Texture<Type, N>& aTexture,
        const Texture<Type, N>& bTexture,
        const ColorMixer<Type>& colorMixer)
    {
        return Combine_Texture<Type, N>(aTexture, bTexture, colorMixer);
    }

}

#endif