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annotate libs/assimp/TerragenLoader.cpp @ 0:b2f14e535253

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author John Tsiombikas <nuclear@member.fsf.org>
date Sat, 01 Feb 2014 19:58:19 +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 Implementation of the Terragen importer class */
nuclear@0 43
nuclear@0 44 #include "AssimpPCH.h"
nuclear@0 45
nuclear@0 46 #ifndef ASSIMP_BUILD_NO_TERRAGEN_IMPORTER
nuclear@0 47 #include "TerragenLoader.h"
nuclear@0 48
nuclear@0 49 using namespace Assimp;
nuclear@0 50
nuclear@0 51 static const aiImporterDesc desc = {
nuclear@0 52 "Terragen Heightmap Importer",
nuclear@0 53 "",
nuclear@0 54 "",
nuclear@0 55 "http://www.planetside.co.uk/",
nuclear@0 56 aiImporterFlags_SupportBinaryFlavour,
nuclear@0 57 0,
nuclear@0 58 0,
nuclear@0 59 0,
nuclear@0 60 0,
nuclear@0 61 "ter"
nuclear@0 62 };
nuclear@0 63
nuclear@0 64 // ------------------------------------------------------------------------------------------------
nuclear@0 65 // Constructor to be privately used by Importer
nuclear@0 66 TerragenImporter::TerragenImporter()
nuclear@0 67 : configComputeUVs (false)
nuclear@0 68 {}
nuclear@0 69
nuclear@0 70 // ------------------------------------------------------------------------------------------------
nuclear@0 71 // Destructor, private as well
nuclear@0 72 TerragenImporter::~TerragenImporter()
nuclear@0 73 {}
nuclear@0 74
nuclear@0 75 // ------------------------------------------------------------------------------------------------
nuclear@0 76 // Returns whether the class can handle the format of the given file.
nuclear@0 77 bool TerragenImporter::CanRead( const std::string& pFile, IOSystem* pIOHandler, bool checkSig) const
nuclear@0 78 {
nuclear@0 79 // check file extension
nuclear@0 80 std::string extension = GetExtension(pFile);
nuclear@0 81
nuclear@0 82 if( extension == "ter")
nuclear@0 83 return true;
nuclear@0 84
nuclear@0 85 if( !extension.length() || checkSig) {
nuclear@0 86 /* If CanRead() is called in order to check whether we
nuclear@0 87 * support a specific file extension in general pIOHandler
nuclear@0 88 * might be NULL and it's our duty to return true here.
nuclear@0 89 */
nuclear@0 90 if (!pIOHandler)return true;
nuclear@0 91 const char* tokens[] = {"terragen"};
nuclear@0 92 return SearchFileHeaderForToken(pIOHandler,pFile,tokens,1);
nuclear@0 93 }
nuclear@0 94 return false;
nuclear@0 95 }
nuclear@0 96
nuclear@0 97 // ------------------------------------------------------------------------------------------------
nuclear@0 98 // Build a string of all file extensions supported
nuclear@0 99 const aiImporterDesc* TerragenImporter::GetInfo () const
nuclear@0 100 {
nuclear@0 101 return &desc;
nuclear@0 102 }
nuclear@0 103
nuclear@0 104 // ------------------------------------------------------------------------------------------------
nuclear@0 105 // Setup import properties
nuclear@0 106 void TerragenImporter::SetupProperties(const Importer* pImp)
nuclear@0 107 {
nuclear@0 108 // AI_CONFIG_IMPORT_TER_MAKE_UVS
nuclear@0 109 configComputeUVs = ( 0 != pImp->GetPropertyInteger(AI_CONFIG_IMPORT_TER_MAKE_UVS,0) );
nuclear@0 110 }
nuclear@0 111
nuclear@0 112 // ------------------------------------------------------------------------------------------------
nuclear@0 113 // Imports the given file into the given scene structure.
nuclear@0 114 void TerragenImporter::InternReadFile( const std::string& pFile,
nuclear@0 115 aiScene* pScene, IOSystem* pIOHandler)
nuclear@0 116 {
nuclear@0 117 IOStream* file = pIOHandler->Open( pFile, "rb");
nuclear@0 118
nuclear@0 119 // Check whether we can read from the file
nuclear@0 120 if( file == NULL)
nuclear@0 121 throw DeadlyImportError( "Failed to open TERRAGEN TERRAIN file " + pFile + ".");
nuclear@0 122
nuclear@0 123 // Construct a stream reader to read all data in the correct endianess
nuclear@0 124 StreamReaderLE reader(file);
nuclear@0 125 if(reader.GetRemainingSize() < 16)
nuclear@0 126 throw DeadlyImportError( "TER: file is too small" );
nuclear@0 127
nuclear@0 128 // Check for the existence of the two magic strings 'TERRAGEN' and 'TERRAIN '
nuclear@0 129 if (::strncmp((const char*)reader.GetPtr(),AI_TERR_BASE_STRING,8))
nuclear@0 130 throw DeadlyImportError( "TER: Magic string \'TERRAGEN\' not found" );
nuclear@0 131
nuclear@0 132 if (::strncmp((const char*)reader.GetPtr()+8,AI_TERR_TERRAIN_STRING,8))
nuclear@0 133 throw DeadlyImportError( "TER: Magic string \'TERRAIN\' not found" );
nuclear@0 134
nuclear@0 135 unsigned int x = 0,y = 0,mode = 0;
nuclear@0 136 float rad = 6370.f;
nuclear@0 137 (void)rad;
nuclear@0 138
nuclear@0 139
nuclear@0 140 aiNode* root = pScene->mRootNode = new aiNode();
nuclear@0 141 root->mName.Set("<TERRAGEN.TERRAIN>");
nuclear@0 142
nuclear@0 143 // Default scaling is 30
nuclear@0 144 root->mTransformation.a1 = root->mTransformation.b2 = root->mTransformation.c3 = 30.f;
nuclear@0 145
nuclear@0 146 // Now read all chunks until we're finished or an EOF marker is encountered
nuclear@0 147 reader.IncPtr(16);
nuclear@0 148 while (reader.GetRemainingSize() >= 4)
nuclear@0 149 {
nuclear@0 150 const char* head = (const char*)reader.GetPtr();
nuclear@0 151 reader.IncPtr(4);
nuclear@0 152
nuclear@0 153 // EOF, break in every case
nuclear@0 154 if (!::strncmp(head,AI_TERR_EOF_STRING,4))
nuclear@0 155 break;
nuclear@0 156
nuclear@0 157 // Number of x-data points
nuclear@0 158 if (!::strncmp(head,AI_TERR_CHUNK_XPTS,4))
nuclear@0 159 {
nuclear@0 160 x = (uint16_t)reader.GetI2();
nuclear@0 161 }
nuclear@0 162 // Number of y-data points
nuclear@0 163 else if (!::strncmp(head,AI_TERR_CHUNK_YPTS,4))
nuclear@0 164 {
nuclear@0 165 y = (uint16_t)reader.GetI2();
nuclear@0 166 }
nuclear@0 167 // Squared terrains width-1.
nuclear@0 168 else if (!::strncmp(head,AI_TERR_CHUNK_SIZE,4))
nuclear@0 169 {
nuclear@0 170 x = y = (uint16_t)reader.GetI2()+1;
nuclear@0 171 }
nuclear@0 172 // terrain scaling
nuclear@0 173 else if (!::strncmp(head,AI_TERR_CHUNK_SCAL,4))
nuclear@0 174 {
nuclear@0 175 root->mTransformation.a1 = reader.GetF4();
nuclear@0 176 root->mTransformation.b2 = reader.GetF4();
nuclear@0 177 root->mTransformation.c3 = reader.GetF4();
nuclear@0 178 }
nuclear@0 179 // mapping == 1: earth radius
nuclear@0 180 else if (!::strncmp(head,AI_TERR_CHUNK_CRAD,4))
nuclear@0 181 {
nuclear@0 182 rad = reader.GetF4();
nuclear@0 183 }
nuclear@0 184 // mapping mode
nuclear@0 185 else if (!::strncmp(head,AI_TERR_CHUNK_CRVM,4))
nuclear@0 186 {
nuclear@0 187 mode = reader.GetI1();
nuclear@0 188 if (0 != mode)
nuclear@0 189 DefaultLogger::get()->error("TER: Unsupported mapping mode, a flat terrain is returned");
nuclear@0 190 }
nuclear@0 191 // actual terrain data
nuclear@0 192 else if (!::strncmp(head,AI_TERR_CHUNK_ALTW,4))
nuclear@0 193 {
nuclear@0 194 float hscale = (float)reader.GetI2() / 65536;
nuclear@0 195 float bheight = (float)reader.GetI2();
nuclear@0 196
nuclear@0 197 if (!hscale)hscale = 1;
nuclear@0 198
nuclear@0 199 // Ensure we have enough data
nuclear@0 200 if (reader.GetRemainingSize() < x*y*2)
nuclear@0 201 throw DeadlyImportError("TER: ALTW chunk is too small");
nuclear@0 202
nuclear@0 203 if (x <= 1 || y <= 1)
nuclear@0 204 throw DeadlyImportError("TER: Invalid terrain size");
nuclear@0 205
nuclear@0 206 // Allocate the output mesh
nuclear@0 207 pScene->mMeshes = new aiMesh*[pScene->mNumMeshes = 1];
nuclear@0 208 aiMesh* m = pScene->mMeshes[0] = new aiMesh();
nuclear@0 209
nuclear@0 210 // We return quads
nuclear@0 211 aiFace* f = m->mFaces = new aiFace[m->mNumFaces = (x-1)*(y-1)];
nuclear@0 212 aiVector3D* pv = m->mVertices = new aiVector3D[m->mNumVertices = m->mNumFaces*4];
nuclear@0 213
nuclear@0 214 aiVector3D *uv( NULL );
nuclear@0 215 float step_y( 0.0f ), step_x( 0.0f );
nuclear@0 216 if (configComputeUVs) {
nuclear@0 217 uv = m->mTextureCoords[0] = new aiVector3D[m->mNumVertices];
nuclear@0 218 step_y = 1.f/y;
nuclear@0 219 step_x = 1.f/x;
nuclear@0 220 }
nuclear@0 221 const int16_t* data = (const int16_t*)reader.GetPtr();
nuclear@0 222
nuclear@0 223 for (unsigned int yy = 0, t = 0; yy < y-1;++yy) {
nuclear@0 224 for (unsigned int xx = 0; xx < x-1;++xx,++f) {
nuclear@0 225
nuclear@0 226 // make verts
nuclear@0 227 const float fy = (float)yy, fx = (float)xx;
nuclear@0 228 register unsigned tmp,tmp2;
nuclear@0 229 *pv++ = aiVector3D(fx,fy, (float)data[(tmp2=x*yy) + xx] * hscale + bheight);
nuclear@0 230 *pv++ = aiVector3D(fx,fy+1, (float)data[(tmp=x*(yy+1)) + xx] * hscale + bheight);
nuclear@0 231 *pv++ = aiVector3D(fx+1,fy+1,(float)data[tmp + xx+1] * hscale + bheight);
nuclear@0 232 *pv++ = aiVector3D(fx+1,fy, (float)data[tmp2 + xx+1] * hscale + bheight);
nuclear@0 233
nuclear@0 234 // also make texture coordinates, if necessary
nuclear@0 235 if (configComputeUVs) {
nuclear@0 236 *uv++ = aiVector3D( step_x*xx, step_y*yy, 0.f );
nuclear@0 237 *uv++ = aiVector3D( step_x*xx, step_y*(yy+1), 0.f );
nuclear@0 238 *uv++ = aiVector3D( step_x*(xx+1), step_y*(yy+1), 0.f );
nuclear@0 239 *uv++ = aiVector3D( step_x*(xx+1), step_y*yy, 0.f );
nuclear@0 240 }
nuclear@0 241
nuclear@0 242 // make indices
nuclear@0 243 f->mIndices = new unsigned int[f->mNumIndices = 4];
nuclear@0 244 for (unsigned int i = 0; i < 4;++i)
nuclear@0 245 f->mIndices[i] = t++;
nuclear@0 246 }
nuclear@0 247 }
nuclear@0 248
nuclear@0 249 // Add the mesh to the root node
nuclear@0 250 root->mMeshes = new unsigned int[root->mNumMeshes = 1];
nuclear@0 251 root->mMeshes[0] = 0;
nuclear@0 252 }
nuclear@0 253
nuclear@0 254 // Get to the next chunk (4 byte aligned)
nuclear@0 255 unsigned dtt;
nuclear@0 256 if ((dtt = reader.GetCurrentPos() & 0x3))
nuclear@0 257 reader.IncPtr(4-dtt);
nuclear@0 258 }
nuclear@0 259
nuclear@0 260 // Check whether we have a mesh now
nuclear@0 261 if (pScene->mNumMeshes != 1)
nuclear@0 262 throw DeadlyImportError("TER: Unable to load terrain");
nuclear@0 263
nuclear@0 264 // Set the AI_SCENE_FLAGS_TERRAIN bit
nuclear@0 265 pScene->mFlags |= AI_SCENE_FLAGS_TERRAIN;
nuclear@0 266 }
nuclear@0 267
nuclear@0 268 #endif // !! ASSIMP_BUILD_NO_TERRAGEN_IMPORTER