DetourTileCacheBuilder.h

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//
// Copyright (c) 2009-2010 Mikko Mononen memon@inside.org
//
// This software is provided 'as-is', without any express or implied
// warranty.  In no event will the authors be held liable for any damages
// arising from the use of this software.
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
// 1. The origin of this software must not be misrepresented; you must not
//    claim that you wrote the original software. If you use this software
//    in a product, an acknowledgment in the product documentation would be
//    appreciated but is not required.
// 2. Altered source versions must be plainly marked as such, and must not be
//    misrepresented as being the original software.
// 3. This notice may not be removed or altered from any source distribution.
//

#ifndef DETOURTILECACHEBUILDER_H
#define DETOURTILECACHEBUILDER_H

#include "DetourAlloc.h"
#include "DetourStatus.h"

static const int DT_TILECACHE_MAGIC = 'D'<<24 | 'T'<<16 | 'L'<<8 | 'R'; 
static const int DT_TILECACHE_VERSION = 1;

static const unsigned char DT_TILECACHE_NULL_AREA = 0;
static const unsigned char DT_TILECACHE_WALKABLE_AREA = 63;
static const unsigned short DT_TILECACHE_NULL_IDX = 0xffff;

struct dtTileCacheLayerHeader
{
        int magic;                                                              
        int version;                                                    
        int tx,ty,tlayer;
        float bmin[3], bmax[3];
        unsigned short hmin, hmax;                              
        unsigned char width, height;                    
        unsigned char minx, maxx, miny, maxy;   
};

struct dtTileCacheLayer
{
        dtTileCacheLayerHeader* header;
        unsigned char regCount;                                 
        unsigned char* heights;
        unsigned char* areas;
        unsigned char* cons;
        unsigned char* regs;
};

struct dtTileCacheContour
{
        int nverts;
        unsigned char* verts;
        unsigned char reg;
        unsigned char area;
};

struct dtTileCacheContourSet
{
        int nconts;
        dtTileCacheContour* conts;
};

struct dtTileCachePolyMesh
{
        int nvp;
        int nverts;                             
        int npolys;                             
        unsigned short* verts;  
        unsigned short* polys;  
        unsigned short* flags;  
        unsigned char* areas;   
};


struct dtTileCacheAlloc
{
        virtual void reset()
        {
        }
        
        virtual void* alloc(const int size)
        {
                return dtAlloc(size, DT_ALLOC_TEMP);
        }
        
        virtual void free(void* ptr)
        {
                dtFree(ptr);
        }
};

struct dtTileCacheCompressor
{
        virtual int maxCompressedSize(const int bufferSize) = 0;
        virtual dtStatus compress(const unsigned char* buffer, const int bufferSize,
                                                          unsigned char* compressed, const int maxCompressedSize, int* compressedSize) = 0;
        virtual dtStatus decompress(const unsigned char* compressed, const int compressedSize,
                                                                unsigned char* buffer, const int maxBufferSize, int* bufferSize) = 0;
};


dtStatus dtBuildTileCacheLayer(dtTileCacheCompressor* comp,
                                                           dtTileCacheLayerHeader* header,
                                                           const unsigned char* heights,
                                                           const unsigned char* areas,
                                                           const unsigned char* cons,
                                                           unsigned char** outData, int* outDataSize);

void dtFreeTileCacheLayer(dtTileCacheAlloc* alloc, dtTileCacheLayer* layer);

dtStatus dtDecompressTileCacheLayer(dtTileCacheAlloc* alloc, dtTileCacheCompressor* comp,
                                                                        unsigned char* compressed, const int compressedSize,
                                                                        dtTileCacheLayer** layerOut);

dtTileCacheContourSet* dtAllocTileCacheContourSet(dtTileCacheAlloc* alloc);
void dtFreeTileCacheContourSet(dtTileCacheAlloc* alloc, dtTileCacheContourSet* cset);

dtTileCachePolyMesh* dtAllocTileCachePolyMesh(dtTileCacheAlloc* alloc);
void dtFreeTileCachePolyMesh(dtTileCacheAlloc* alloc, dtTileCachePolyMesh* lmesh);

dtStatus dtMarkCylinderArea(dtTileCacheLayer& layer, const float* orig, const float cs, const float ch,
                                                        const float* pos, const float radius, const float height, const unsigned char areaId);

dtStatus dtBuildTileCacheRegions(dtTileCacheAlloc* alloc,
                                                                 dtTileCacheLayer& layer,
                                                                 const int walkableClimb);

dtStatus dtBuildTileCacheContours(dtTileCacheAlloc* alloc,
                                                                  dtTileCacheLayer& layer,
                                                                  const int walkableClimb,      const float maxError,
                                                                  dtTileCacheContourSet& lcset);

dtStatus dtBuildTileCachePolyMesh(dtTileCacheAlloc* alloc,
                                                                  dtTileCacheContourSet& lcset,
                                                                  dtTileCachePolyMesh& mesh);

bool dtTileCacheHeaderSwapEndian(unsigned char* data, const int dataSize);


#endif // DETOURTILECACHEBUILDER_H