SMaterialLayer.h

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// Copyright (C) 2002-2012 Nikolaus Gebhardt
// This file is part of the "Irrlicht Engine".
// For conditions of distribution and use, see copyright notice in irrlicht.h

#ifndef __S_MATERIAL_LAYER_H_INCLUDED__
#define __S_MATERIAL_LAYER_H_INCLUDED__

#include "matrix4.h"
#include "irrAllocator.h"

namespace irr
{
namespace video
{
    class ITexture;

    enum E_TEXTURE_CLAMP
    {
        ETC_REPEAT = 0,
        ETC_CLAMP,
        ETC_CLAMP_TO_EDGE,
        ETC_CLAMP_TO_BORDER,
        ETC_MIRROR,
        ETC_MIRROR_CLAMP,
        ETC_MIRROR_CLAMP_TO_EDGE,
        ETC_MIRROR_CLAMP_TO_BORDER
    };
    static const char* const aTextureClampNames[] = {
            "texture_clamp_repeat",
            "texture_clamp_clamp",
            "texture_clamp_clamp_to_edge",
            "texture_clamp_clamp_to_border",
            "texture_clamp_mirror",
            "texture_clamp_mirror_clamp",
            "texture_clamp_mirror_clamp_to_edge",
            "texture_clamp_mirror_clamp_to_border", 0};

    class SMaterialLayer
    {
    public:
        SMaterialLayer()
            : Texture(0),
                TextureWrapU(ETC_REPEAT),
                TextureWrapV(ETC_REPEAT),
                BilinearFilter(true),
                TrilinearFilter(false),
                AnisotropicFilter(0),
                LODBias(0),
                TextureMatrix(0)
            {}


        SMaterialLayer(const SMaterialLayer& other)
        {
            // This pointer is checked during assignment
            TextureMatrix = 0;
            *this = other;
        }

        ~SMaterialLayer()
        {
            MatrixAllocator.destruct(TextureMatrix);
            MatrixAllocator.deallocate(TextureMatrix); 
        }


        SMaterialLayer& operator=(const SMaterialLayer& other)
        {
            // Check for self-assignment!
            if (this == &other)
                return *this;

            Texture = other.Texture;
            if (TextureMatrix)
            {
                if (other.TextureMatrix)
                    *TextureMatrix = *other.TextureMatrix;
                else
                {
                    MatrixAllocator.destruct(TextureMatrix);
                    MatrixAllocator.deallocate(TextureMatrix); 
                    TextureMatrix = 0;
                }
            }
            else
            {
                if (other.TextureMatrix)
                {
                    TextureMatrix = MatrixAllocator.allocate(1);
                    MatrixAllocator.construct(TextureMatrix,*other.TextureMatrix);
                }
                else
                    TextureMatrix = 0;
            }
            TextureWrapU = other.TextureWrapU;
            TextureWrapV = other.TextureWrapV;
            BilinearFilter = other.BilinearFilter;
            TrilinearFilter = other.TrilinearFilter;
            AnisotropicFilter = other.AnisotropicFilter;
            LODBias = other.LODBias;

            return *this;
        }


        core::matrix4& getTextureMatrix()
        {
            if (!TextureMatrix)
            {
                TextureMatrix = MatrixAllocator.allocate(1);
                MatrixAllocator.construct(TextureMatrix,core::IdentityMatrix);
            }
            return *TextureMatrix;
        }


        const core::matrix4& getTextureMatrix() const
        {
            if (TextureMatrix)
                return *TextureMatrix;
            else
                return core::IdentityMatrix;
        }


        void setTextureMatrix(const core::matrix4& mat)
        {
            if (!TextureMatrix)
            {
                TextureMatrix = MatrixAllocator.allocate(1);
                MatrixAllocator.construct(TextureMatrix,mat);
            }
            else
                *TextureMatrix = mat;
        }


        inline bool operator!=(const SMaterialLayer& b) const
        {
            bool different =
                Texture != b.Texture ||
                TextureWrapU != b.TextureWrapU ||
                TextureWrapV != b.TextureWrapV ||
                BilinearFilter != b.BilinearFilter ||
                TrilinearFilter != b.TrilinearFilter ||
                AnisotropicFilter != b.AnisotropicFilter ||
                LODBias != b.LODBias;
            if (different)
                return true;
            else
                different |= (TextureMatrix != b.TextureMatrix) &&
                    TextureMatrix && b.TextureMatrix &&
                    (*TextureMatrix != *(b.TextureMatrix));
            return different;
        }


        inline bool operator==(const SMaterialLayer& b) const
        { return !(b!=*this); }

        ITexture* Texture;


        u8 TextureWrapU:4;
        u8 TextureWrapV:4;

        bool BilinearFilter:1;


        bool TrilinearFilter:1;


        u8 AnisotropicFilter;


        s8 LODBias;

    private:
        friend class SMaterial;
        irr::core::irrAllocator<irr::core::matrix4> MatrixAllocator;


        core::matrix4* TextureMatrix;
    };

} // end namespace video
} // end namespace irr

#endif // __S_MATERIAL_LAYER_H_INCLUDED__