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annotate libs/assimp/FindDegenerates.cpp @ 3:c179c72369be

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rename candy->vr
author John Tsiombikas <nuclear@member.fsf.org>
date Mon, 03 Feb 2014 08:52:13 +0200
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nuclear@0 1 /*
nuclear@0 2 ---------------------------------------------------------------------------
nuclear@0 3 Open Asset Import Library (assimp)
nuclear@0 4 ---------------------------------------------------------------------------
nuclear@0 5
nuclear@0 6 Copyright (c) 2006-2012, assimp team
nuclear@0 7
nuclear@0 8 All rights reserved.
nuclear@0 9
nuclear@0 10 Redistribution and use of this software in source and binary forms,
nuclear@0 11 with or without modification, are permitted provided that the following
nuclear@0 12 conditions are met:
nuclear@0 13
nuclear@0 14 * Redistributions of source code must retain the above
nuclear@0 15 copyright notice, this list of conditions and the
nuclear@0 16 following disclaimer.
nuclear@0 17
nuclear@0 18 * Redistributions in binary form must reproduce the above
nuclear@0 19 copyright notice, this list of conditions and the
nuclear@0 20 following disclaimer in the documentation and/or other
nuclear@0 21 materials provided with the distribution.
nuclear@0 22
nuclear@0 23 * Neither the name of the assimp team, nor the names of its
nuclear@0 24 contributors may be used to endorse or promote products
nuclear@0 25 derived from this software without specific prior
nuclear@0 26 written permission of the assimp team.
nuclear@0 27
nuclear@0 28 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
nuclear@0 29 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
nuclear@0 30 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
nuclear@0 31 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
nuclear@0 32 OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
nuclear@0 33 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
nuclear@0 34 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
nuclear@0 35 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
nuclear@0 36 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
nuclear@0 37 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
nuclear@0 38 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
nuclear@0 39 ---------------------------------------------------------------------------
nuclear@0 40 */
nuclear@0 41
nuclear@0 42 /** @file FindDegenerates.cpp
nuclear@0 43 * @brief Implementation of the FindDegenerates post-process step.
nuclear@0 44 */
nuclear@0 45
nuclear@0 46 #include "AssimpPCH.h"
nuclear@0 47
nuclear@0 48 // internal headers
nuclear@0 49 #include "ProcessHelper.h"
nuclear@0 50 #include "FindDegenerates.h"
nuclear@0 51
nuclear@0 52 using namespace Assimp;
nuclear@0 53
nuclear@0 54 // ------------------------------------------------------------------------------------------------
nuclear@0 55 // Constructor to be privately used by Importer
nuclear@0 56 FindDegeneratesProcess::FindDegeneratesProcess()
nuclear@0 57 : configRemoveDegenerates (false)
nuclear@0 58 {}
nuclear@0 59
nuclear@0 60 // ------------------------------------------------------------------------------------------------
nuclear@0 61 // Destructor, private as well
nuclear@0 62 FindDegeneratesProcess::~FindDegeneratesProcess()
nuclear@0 63 {
nuclear@0 64 // nothing to do here
nuclear@0 65 }
nuclear@0 66
nuclear@0 67 // ------------------------------------------------------------------------------------------------
nuclear@0 68 // Returns whether the processing step is present in the given flag field.
nuclear@0 69 bool FindDegeneratesProcess::IsActive( unsigned int pFlags) const
nuclear@0 70 {
nuclear@0 71 return 0 != (pFlags & aiProcess_FindDegenerates);
nuclear@0 72 }
nuclear@0 73
nuclear@0 74 // ------------------------------------------------------------------------------------------------
nuclear@0 75 // Setup import configuration
nuclear@0 76 void FindDegeneratesProcess::SetupProperties(const Importer* pImp)
nuclear@0 77 {
nuclear@0 78 // Get the current value of AI_CONFIG_PP_FD_REMOVE
nuclear@0 79 configRemoveDegenerates = (0 != pImp->GetPropertyInteger(AI_CONFIG_PP_FD_REMOVE,0));
nuclear@0 80 }
nuclear@0 81
nuclear@0 82 // ------------------------------------------------------------------------------------------------
nuclear@0 83 // Executes the post processing step on the given imported data.
nuclear@0 84 void FindDegeneratesProcess::Execute( aiScene* pScene)
nuclear@0 85 {
nuclear@0 86 DefaultLogger::get()->debug("FindDegeneratesProcess begin");
nuclear@0 87 for (unsigned int i = 0; i < pScene->mNumMeshes;++i){
nuclear@0 88 ExecuteOnMesh( pScene->mMeshes[i]);
nuclear@0 89 }
nuclear@0 90 DefaultLogger::get()->debug("FindDegeneratesProcess finished");
nuclear@0 91 }
nuclear@0 92
nuclear@0 93 // ------------------------------------------------------------------------------------------------
nuclear@0 94 // Executes the post processing step on the given imported mesh
nuclear@0 95 void FindDegeneratesProcess::ExecuteOnMesh( aiMesh* mesh)
nuclear@0 96 {
nuclear@0 97 mesh->mPrimitiveTypes = 0;
nuclear@0 98
nuclear@0 99 std::vector<bool> remove_me;
nuclear@0 100 if (configRemoveDegenerates)
nuclear@0 101 remove_me.resize(mesh->mNumFaces,false);
nuclear@0 102
nuclear@0 103 unsigned int deg = 0, limit;
nuclear@0 104 for (unsigned int a = 0; a < mesh->mNumFaces; ++a)
nuclear@0 105 {
nuclear@0 106 aiFace& face = mesh->mFaces[a];
nuclear@0 107 bool first = true;
nuclear@0 108
nuclear@0 109 // check whether the face contains degenerated entries
nuclear@0 110 for (register unsigned int i = 0; i < face.mNumIndices; ++i)
nuclear@0 111 {
nuclear@0 112 // Polygons with more than 4 points are allowed to have double points, that is
nuclear@0 113 // simulating polygons with holes just with concave polygons. However,
nuclear@0 114 // double points may not come directly after another.
nuclear@0 115 limit = face.mNumIndices;
nuclear@0 116 if (face.mNumIndices > 4)
nuclear@0 117 limit = std::min(limit,i+2);
nuclear@0 118
nuclear@0 119 for (register unsigned int t = i+1; t < limit; ++t)
nuclear@0 120 {
nuclear@0 121 if (mesh->mVertices[face.mIndices[i]] == mesh->mVertices[face.mIndices[t]])
nuclear@0 122 {
nuclear@0 123 // we have found a matching vertex position
nuclear@0 124 // remove the corresponding index from the array
nuclear@0 125 --face.mNumIndices;--limit;
nuclear@0 126 for (unsigned int m = t; m < face.mNumIndices; ++m)
nuclear@0 127 {
nuclear@0 128 face.mIndices[m] = face.mIndices[m+1];
nuclear@0 129 }
nuclear@0 130 --t;
nuclear@0 131
nuclear@0 132 // NOTE: we set the removed vertex index to an unique value
nuclear@0 133 // to make sure the developer gets notified when his
nuclear@0 134 // application attemps to access this data.
nuclear@0 135 face.mIndices[face.mNumIndices] = 0xdeadbeef;
nuclear@0 136
nuclear@0 137 if(first)
nuclear@0 138 {
nuclear@0 139 ++deg;
nuclear@0 140 first = false;
nuclear@0 141 }
nuclear@0 142
nuclear@0 143 if (configRemoveDegenerates) {
nuclear@0 144 remove_me[a] = true;
nuclear@0 145 goto evil_jump_outside; // hrhrhrh ... yeah, this rocks baby!
nuclear@0 146 }
nuclear@0 147 }
nuclear@0 148 }
nuclear@0 149 }
nuclear@0 150
nuclear@0 151 // We need to update the primitive flags array of the mesh.
nuclear@0 152 switch (face.mNumIndices)
nuclear@0 153 {
nuclear@0 154 case 1u:
nuclear@0 155 mesh->mPrimitiveTypes |= aiPrimitiveType_POINT;
nuclear@0 156 break;
nuclear@0 157 case 2u:
nuclear@0 158 mesh->mPrimitiveTypes |= aiPrimitiveType_LINE;
nuclear@0 159 break;
nuclear@0 160 case 3u:
nuclear@0 161 mesh->mPrimitiveTypes |= aiPrimitiveType_TRIANGLE;
nuclear@0 162 break;
nuclear@0 163 default:
nuclear@0 164 mesh->mPrimitiveTypes |= aiPrimitiveType_POLYGON;
nuclear@0 165 break;
nuclear@0 166 };
nuclear@0 167 evil_jump_outside:
nuclear@0 168 continue;
nuclear@0 169 }
nuclear@0 170
nuclear@0 171 // If AI_CONFIG_PP_FD_REMOVE is true, remove degenerated faces from the import
nuclear@0 172 if (configRemoveDegenerates && deg) {
nuclear@0 173 unsigned int n = 0;
nuclear@0 174 for (unsigned int a = 0; a < mesh->mNumFaces; ++a)
nuclear@0 175 {
nuclear@0 176 aiFace& face_src = mesh->mFaces[a];
nuclear@0 177 if (!remove_me[a]) {
nuclear@0 178 aiFace& face_dest = mesh->mFaces[n++];
nuclear@0 179
nuclear@0 180 // Do a manual copy, keep the index array
nuclear@0 181 face_dest.mNumIndices = face_src.mNumIndices;
nuclear@0 182 face_dest.mIndices = face_src.mIndices;
nuclear@0 183
nuclear@0 184 if (&face_src != &face_dest) {
nuclear@0 185 // clear source
nuclear@0 186 face_src.mNumIndices = 0;
nuclear@0 187 face_src.mIndices = NULL;
nuclear@0 188 }
nuclear@0 189 }
nuclear@0 190 else {
nuclear@0 191 // Otherwise delete it if we don't need this face
nuclear@0 192 delete[] face_src.mIndices;
nuclear@0 193 face_src.mIndices = NULL;
nuclear@0 194 face_src.mNumIndices = 0;
nuclear@0 195 }
nuclear@0 196 }
nuclear@0 197 // Just leave the rest of the array unreferenced, we don't care for now
nuclear@0 198 mesh->mNumFaces = n;
nuclear@0 199 if (!mesh->mNumFaces) {
nuclear@0 200 // WTF!?
nuclear@0 201 // OK ... for completeness and because I'm not yet tired,
nuclear@0 202 // let's write code that willl hopefully never be called
nuclear@0 203 // (famous last words)
nuclear@0 204
nuclear@0 205 // OK ... bad idea.
nuclear@0 206 throw DeadlyImportError("Mesh is empty after removal of degenerated primitives ... WTF!?");
nuclear@0 207 }
nuclear@0 208 }
nuclear@0 209
nuclear@0 210 if (deg && !DefaultLogger::isNullLogger())
nuclear@0 211 {
nuclear@0 212 char s[64];
nuclear@0 213 ASSIMP_itoa10(s,deg);
nuclear@0 214 DefaultLogger::get()->warn(std::string("Found ") + s + " degenerated primitives");
nuclear@0 215 }
nuclear@0 216 }