Texture2DArray

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/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
 *
 * This library is open source and may be redistributed and/or modified under
 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
 * (at your option) any later version.  The full license is in LICENSE file
 * included with this distribution, and on the openscenegraph.org website.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * OpenSceneGraph Public License for more details.
*/
 
#ifndef OSG_TEXTURE2DARRAY
#define OSG_TEXTURE2DARRAY 1
 
#include <osg/Texture>
#include <list>
 
namespace osg {

class OSG_EXPORT Texture2DArray : public Texture
{
 
    public :
 
        Texture2DArray();

        Texture2DArray(const Texture2DArray& cm,const CopyOp& copyop=CopyOp::SHALLOW_COPY);
 
        META_StateAttribute(osg, Texture2DArray, TEXTURE);

        virtual int compare(const StateAttribute& rhs) const;
 
        virtual GLenum getTextureTarget() const { return GL_TEXTURE_2D_ARRAY; }

        virtual bool getModeUsage(StateAttribute::ModeUsage&) const { return false; }

        virtual void setImage(unsigned int layer, Image* image);
 
        template<class T> void setImage(unsigned int layer, const ref_ptr<T>& image) { setImage(layer, image.get()); }

        virtual Image* getImage(unsigned int layer);

        virtual const Image* getImage(unsigned int layer) const;

        virtual unsigned int getNumImages() const { return _images.size(); }

        virtual bool isDirty(unsigned int contextID) const
        {
            for(unsigned int i=0; i<_images.size(); ++i)
            {
                if (_images[i].valid() && _images[i]->getModifiedCount()!=_modifiedCount[i][contextID]) return true;
            }
            return false;
        }

        inline unsigned int& getModifiedCount(unsigned int layer, unsigned int contextID) const
        {
            // get the modified count for the current contextID.
            return _modifiedCount[layer][contextID];
        }

        void setTextureSize(int width, int height, int depth);
 
        void setTextureWidth(int width) { _textureWidth=width; }
        void setTextureHeight(int height) { _textureHeight=height; }
        void setTextureDepth(int depth);
 
        virtual int getTextureWidth() const { return _textureWidth; }
        virtual int getTextureHeight() const { return _textureHeight; }
        virtual int getTextureDepth() const { return _textureDepth; }
 
        class OSG_EXPORT SubloadCallback : public Referenced
        {
            public:
                virtual void load(const Texture2DArray& texture,State& state) const = 0;
                virtual void subload(const Texture2DArray& texture,State& state) const = 0;
        };
 
 
        void setSubloadCallback(SubloadCallback* cb) { _subloadCallback = cb;; }
 
        SubloadCallback* getSubloadCallback() { return _subloadCallback.get(); }
 
        const SubloadCallback* getSubloadCallback() const { return _subloadCallback.get(); }
 
 

        void setNumMipmapLevels(unsigned int num) const { _numMipmapLevels=num; }

        unsigned int getNumMipmapLevels() const { return _numMipmapLevels; }

        void copyTexSubImage2DArray(State& state, int xoffset, int yoffset, int zoffset, int x, int y, int width, int height );

        virtual void apply(State& state) const;
 
    protected :
 
        virtual ~Texture2DArray();
 
        bool imagesValid() const;
 
        virtual void computeInternalFormat() const;
        GLsizei computeTextureDepth() const;
        void allocateMipmap(State& state) const;
 
        void applyTexImage2DArray_subload(State& state, Image* image, GLsizei layer, GLsizei inwidth, GLsizei inheight, GLsizei indepth, GLint inInternalFormat, GLsizei& numMipmapLevels) const;
 
        typedef std::vector< ref_ptr<Image> > Images;
        Images _images;
 
        // subloaded images can have different texture and image sizes.
        mutable GLsizei _textureWidth, _textureHeight, _textureDepth;
 
        // number of mip map levels the texture has been created with,
        mutable GLsizei _numMipmapLevels;
 
        ref_ptr<SubloadCallback> _subloadCallback;
 
        typedef buffered_value<unsigned int> ImageModifiedCount;
        mutable std::vector<ImageModifiedCount> _modifiedCount;
};
 
}
 
#endif