mirror of https://github.com/axmolengine/axmol.git
290 lines
8.4 KiB
C++
290 lines
8.4 KiB
C++
/****************************************************************************
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Copyright (c) 2015 Chukong Technologies Inc.
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http://www.cocos2d-x.org
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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****************************************************************************/
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#include "navmesh/CCNavMeshUtils.h"
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#if CC_USE_NAVMESH
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#include "recast/Detour/DetourCommon.h"
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#include "recast/Detour/DetourNavMeshBuilder.h"
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#include "recast/fastlz/fastlz.h"
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NS_CC_BEGIN
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LinearAllocator::LinearAllocator(const int cap)
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: buffer(nullptr)
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, capacity(0)
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, top(0)
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, high(0)
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{
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resize(cap);
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}
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LinearAllocator::~LinearAllocator()
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{
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dtFree(buffer);
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}
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void LinearAllocator::free(void* /*ptr*/)
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{
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}
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void* LinearAllocator::alloc(const int size)
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{
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if (!buffer)
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return 0;
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if (top + size > capacity)
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return 0;
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unsigned char* mem = &buffer[top];
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top += size;
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return mem;
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}
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void LinearAllocator::reset()
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{
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high = dtMax(high, top);
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top = 0;
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}
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void LinearAllocator::resize(const int cap)
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{
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if (buffer) dtFree(buffer);
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buffer = (unsigned char*)dtAlloc(cap, DT_ALLOC_PERM);
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capacity = cap;
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}
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int FastLZCompressor::maxCompressedSize(const int bufferSize)
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{
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return (int)(bufferSize* 1.05f);
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}
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dtStatus cocos2d::FastLZCompressor::decompress(const unsigned char* compressed, const int compressedSize
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, unsigned char* buffer, const int maxBufferSize, int* bufferSize)
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{
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*bufferSize = fastlz_decompress(compressed, compressedSize, buffer, maxBufferSize);
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return *bufferSize < 0 ? DT_FAILURE : DT_SUCCESS;
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}
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dtStatus cocos2d::FastLZCompressor::compress(const unsigned char* buffer, const int bufferSize
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, unsigned char* compressed, const int /*maxCompressedSize*/, int* compressedSize)
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{
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*compressedSize = fastlz_compress((const void *const)buffer, bufferSize, compressed);
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return DT_SUCCESS;
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}
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MeshProcess::MeshProcess(const GeomData *geom)
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: data(geom)
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{
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}
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MeshProcess::~MeshProcess()
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{
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}
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void MeshProcess::process(struct dtNavMeshCreateParams* params
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, unsigned char* polyAreas, unsigned short* polyFlags)
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{
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// Update poly flags from areas.
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for (int i = 0; i < params->polyCount; ++i)
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{
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if (polyAreas[i] == DT_TILECACHE_WALKABLE_AREA)
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polyAreas[i] = 0;
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if (polyAreas[i] == 0)
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polyFlags[i] = 1;
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//if (polyAreas[i] == SAMPLE_POLYAREA_GROUND ||
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// polyAreas[i] == SAMPLE_POLYAREA_GRASS ||
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// polyAreas[i] == SAMPLE_POLYAREA_ROAD)
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//{
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// polyFlags[i] = SAMPLE_POLYFLAGS_WALK;
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//}
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//else if (polyAreas[i] == SAMPLE_POLYAREA_WATER)
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//{
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// polyFlags[i] = SAMPLE_POLYFLAGS_SWIM;
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//}
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//else if (polyAreas[i] == SAMPLE_POLYAREA_DOOR)
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//{
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// polyFlags[i] = SAMPLE_POLYFLAGS_WALK | SAMPLE_POLYFLAGS_DOOR;
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//}
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}
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// Pass in off-mesh connections.
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params->offMeshConVerts = data->offMeshConVerts;
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params->offMeshConRad = data->offMeshConRads;
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params->offMeshConDir = data->offMeshConDirs;
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params->offMeshConAreas = data->offMeshConAreas;
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params->offMeshConFlags = data->offMeshConFlags;
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params->offMeshConUserID = data->offMeshConId;
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params->offMeshConCount = data->offMeshConCount;
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}
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bool getSteerTarget(dtNavMeshQuery* navQuery, const float* startPos, const float* endPos, const float minTargetDist, const dtPolyRef* path, const int pathSize, float* steerPos, unsigned char& steerPosFlag, dtPolyRef& steerPosRef, float* outPoints /*= 0*/, int* outPointCount /*= 0*/)
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{
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// Find steer target.
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static const int MAX_STEER_POINTS = 3;
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float steerPath[MAX_STEER_POINTS * 3];
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unsigned char steerPathFlags[MAX_STEER_POINTS];
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dtPolyRef steerPathPolys[MAX_STEER_POINTS];
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int nsteerPath = 0;
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navQuery->findStraightPath(startPos, endPos, path, pathSize,
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steerPath, steerPathFlags, steerPathPolys, &nsteerPath, MAX_STEER_POINTS);
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if (!nsteerPath)
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return false;
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if (outPoints && outPointCount)
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{
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*outPointCount = nsteerPath;
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for (int i = 0; i < nsteerPath; ++i)
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dtVcopy(&outPoints[i * 3], &steerPath[i * 3]);
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}
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// Find vertex far enough to steer to.
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int ns = 0;
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while (ns < nsteerPath)
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{
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// Stop at Off-Mesh link or when point is further than slop away.
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if ((steerPathFlags[ns] & DT_STRAIGHTPATH_OFFMESH_CONNECTION) ||
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!inRange(&steerPath[ns * 3], startPos, minTargetDist, 1000.0f))
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break;
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ns++;
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}
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// Failed to find good point to steer to.
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if (ns >= nsteerPath)
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return false;
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dtVcopy(steerPos, &steerPath[ns * 3]);
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steerPos[1] = startPos[1];
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steerPosFlag = steerPathFlags[ns];
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steerPosRef = steerPathPolys[ns];
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return true;
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}
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int fixupShortcuts(dtPolyRef* path, int npath, dtNavMeshQuery* navQuery)
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{
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if (npath < 3)
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return npath;
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// Get connected polygons
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static const int maxNeis = 16;
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dtPolyRef neis[maxNeis];
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int nneis = 0;
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const dtMeshTile* tile = 0;
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const dtPoly* poly = 0;
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if (dtStatusFailed(navQuery->getAttachedNavMesh()->getTileAndPolyByRef(path[0], &tile, &poly)))
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return npath;
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for (unsigned int k = poly->firstLink; k != DT_NULL_LINK; k = tile->links[k].next)
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{
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const dtLink* link = &tile->links[k];
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if (link->ref != 0)
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{
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if (nneis < maxNeis)
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neis[nneis++] = link->ref;
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}
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}
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// If any of the neighbour polygons is within the next few polygons
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// in the path, short cut to that polygon directly.
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static const int maxLookAhead = 6;
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int cut = 0;
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for (int i = dtMin(maxLookAhead, npath) - 1; i > 1 && cut == 0; i--) {
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for (int j = 0; j < nneis; j++)
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{
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if (path[i] == neis[j]) {
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cut = i;
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break;
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}
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}
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}
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if (cut > 1)
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{
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int offset = cut - 1;
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npath -= offset;
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for (int i = 1; i < npath; i++)
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path[i] = path[i + offset];
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}
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return npath;
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}
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int fixupCorridor(dtPolyRef* path, const int npath, const int maxPath, const dtPolyRef* visited, const int nvisited)
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{
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int furthestPath = -1;
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int furthestVisited = -1;
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// Find furthest common polygon.
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for (int i = npath - 1; i >= 0; --i)
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{
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bool found = false;
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for (int j = nvisited - 1; j >= 0; --j)
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{
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if (path[i] == visited[j])
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{
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furthestPath = i;
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furthestVisited = j;
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found = true;
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}
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}
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if (found)
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break;
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}
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// If no intersection found just return current path.
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if (furthestPath == -1 || furthestVisited == -1)
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return npath;
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// Concatenate paths.
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// Adjust beginning of the buffer to include the visited.
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const int req = nvisited - furthestVisited;
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const int orig = dtMin(furthestPath + 1, npath);
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int size = dtMax(0, npath - orig);
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if (req + size > maxPath)
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size = maxPath - req;
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if (size)
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memmove(path + req, path + orig, size*sizeof(dtPolyRef));
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// Store visited
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for (int i = 0; i < req; ++i)
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path[i] = visited[(nvisited - 1) - i];
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return req + size;
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}
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bool inRange(const float* v1, const float* v2, const float r, const float h)
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{
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const float dx = v2[0] - v1[0];
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const float dy = v2[1] - v1[1];
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const float dz = v2[2] - v1[2];
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return (dx*dx + dz*dz) < r*r && fabsf(dy) < h;
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}
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NS_CC_END
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#endif //CC_USE_NAVMESH
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