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# PtexImporter/ptex/PtexWriter.h

    #ifndef PtexWriter_h
    #define PtexWriter_h

    /*
    PTEX SOFTWARE
    Copyright 2009 Disney Enterprises, Inc.  All rights reserved

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions are
    met:

      * Redistributions of source code must retain the above copyright
        notice, this list of conditions and the following disclaimer.

      * Redistributions in binary form must reproduce the above copyright
        notice, this list of conditions and the following disclaimer in
        the documentation and/or other materials provided with the
        distribution.

      * The names "Disney", "Walt Disney Pictures", "Walt Disney Animation
        Studios" or the names of its contributors may NOT be used to
        endorse or promote products derived from this software without
        specific prior written permission from Walt Disney Pictures.

    Disclaimer: THIS SOFTWARE IS PROVIDED BY WALT DISNEY PICTURES AND
    CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
    BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
    FOR A PARTICULAR PURPOSE, NONINFRINGEMENT AND TITLE ARE DISCLAIMED.
    IN NO EVENT SHALL WALT DISNEY PICTURES, THE COPYRIGHT HOLDER OR
    CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND BASED ON ANY
    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
    OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
    */

    #include "PtexPlatform.h"
    #include "zlib/zlib.h"
    #include <map>
    #include <vector>
    #include <stdio.h>
    #include "Ptexture.h"
    #include "PtexIO.h"
    #include "PtexReader.h"

    class PtexWriterBase : public PtexWriter, public PtexIO {
    public:
        virtual void setBorderModes(Ptex::BorderMode uBorderMode, Ptex::BorderMode vBorderMode)
        {
        _extheader.ubordermode = uBorderMode;
        _extheader.vbordermode = vBorderMode;
        }
        virtual void writeMeta(const char* key, const char* value);
        virtual void writeMeta(const char* key, const int8_t* value, int count);
        virtual void writeMeta(const char* key, const int16_t* value, int count);
        virtual void writeMeta(const char* key, const int32_t* value, int count);
        virtual void writeMeta(const char* key, const float* value, int count);
        virtual void writeMeta(const char* key, const double* value, int count);
        virtual void writeMeta(PtexMetaData* data);
        virtual bool close(Ptex::String& error);
        virtual void release();

        bool ok(Ptex::String& error) {
        if (!_ok) getError(error);
        return _ok;
        }
        void getError(Ptex::String& error) {
        error = (_error + "\nPtex file: " + _path).c_str();
        }

    protected:
        struct MetaEntry {
        std::string key;
        MetaDataType datatype;
        std::vector<uint8_t> data;
        MetaEntry() : datatype(MetaDataType(0)), data() {}
        };

        virtual void finish() = 0;
        PtexWriterBase(const char* path,
               Ptex::MeshType mt, Ptex::DataType dt,
               int nchannels, int alphachan, int nfaces,
               bool compress);
        virtual ~PtexWriterBase();

        int writeBlank(FILE* fp, int size);
        int writeBlock(FILE* fp, const void* data, int size);
        int writeZipBlock(FILE* fp, const void* data, int size, bool finish=true);
        int readBlock(FILE* fp, void* data, int size);
        int copyBlock(FILE* dst, FILE* src, FilePos pos, int size);
        Res calcTileRes(Res faceres);
        virtual void addMetaData(const char* key, MetaDataType t, const void* value, int size);
        void writeConstFaceBlock(FILE* fp, const void* data, FaceDataHeader& fdh);
        void writeFaceBlock(FILE* fp, const void* data, int stride, Res res,
                   FaceDataHeader& fdh);
        void writeFaceData(FILE* fp, const void* data, int stride, Res res,
                   FaceDataHeader& fdh);
        void writeReduction(FILE* fp, const void* data, int stride, Res res);
        int writeMetaDataBlock(FILE* fp, MetaEntry& val);
        void setError(const std::string& error) { _error = error; _ok = false; }
        bool storeFaceInfo(int faceid, FaceInfo& dest, const FaceInfo& src, int flags=0);

        bool _ok;                    // true if no error has occurred
        std::string _error;              // the error text (if any)
        std::string _path;               // file path
        std::string _tilepath;           // temp tile file path ("<path>.tiles.tmp")
        FILE* _tilefp;               // temp tile file handle
        Header _header;              // the file header
        ExtHeader _extheader;            // extended header
        int _pixelSize;              // size of a pixel in bytes
        std::vector<MetaEntry> _metadata;        // meta data waiting to be written
        std::map<std::string,int> _metamap;      // for preventing duplicate keys
        z_stream_s _zstream;             // libzip compression stream

        PtexUtils::ReduceFn* _reduceFn;
    };

    class PtexMainWriter : public PtexWriterBase {
    public:
        PtexMainWriter(const char* path, PtexTexture* tex,
               Ptex::MeshType mt, Ptex::DataType dt,
               int nchannels, int alphachan, int nfaces, bool genmipmaps);

        virtual bool close(Ptex::String& error);
        virtual bool writeFace(int faceid, const FaceInfo& f, const void* data, int stride);
        virtual bool writeConstantFace(int faceid, const FaceInfo& f, const void* data);

    protected:
        virtual ~PtexMainWriter();
        virtual void addMetaData(const char* key, MetaDataType t, const void* value, int size)
        {
        PtexWriterBase::addMetaData(key, t, value, size);
        _hasNewData = true;
        }

    private:
        virtual void finish();
        void generateReductions();
        void flagConstantNeighorhoods();
        void storeConstValue(int faceid, const void* data, int stride, Res res);
        void writeMetaData(FILE* fp);

        std::string _newpath;         // path to ".new" file
        std::string _tmppath;         // temp file path ("<path>.tmp")
        FILE* _tmpfp;             // temp file handle
        bool _hasNewData;             // true if data has been written
        bool _genmipmaps;             // true if mipmaps should be generated
        std::vector<FaceInfo> _faceinfo;      // info about each face
        std::vector<uint8_t> _constdata;      // constant data for each face
        std::vector<uint32_t> _rfaceids;      // faceid reordering for reduction levels
        std::vector<uint32_t> _faceids_r;     // faceid indexed by rfaceid

        static const int MinReductionLog2 =2; // log2(minimum reduction size) - can tune
        struct LevelRec {
        // note: level 0 is ordered by faceid
        //       levels 1+ are reduction levels (half res in both u and v) and
        //       are ordered by rfaceid[faceid].   Also, faces with a minimum
        //       dimension (the smaller of u or v) smaller than MinReductionLog2
        //       are omitted from subsequent levels.
        std::vector<FilePos> pos;     // position of data blocks within _tmp file
        std::vector<FaceDataHeader> fdh;  // face data headers
        };
        std::vector<LevelRec> _levels;    // info about each level
        std::vector<FilePos> _rpos;       // reduction file positions

        PtexReader* _reader;              // reader for accessing existing data in file
    };

    class PtexIncrWriter : public PtexWriterBase {
     public:
        PtexIncrWriter(const char* path, FILE* fp,
               Ptex::MeshType mt, Ptex::DataType dt,
               int nchannels, int alphachan, int nfaces);

        virtual bool close(Ptex::String& error);
        virtual bool writeFace(int faceid, const FaceInfo& f, const void* data, int stride);
        virtual bool writeConstantFace(int faceid, const FaceInfo& f, const void* data);

     protected:
        void writeMetaDataEdit();
        virtual void finish();
        virtual ~PtexIncrWriter();

     private:
        FILE* _fp;      // the file being edited
    };

    #endif