2 Copyright (C) 1999-2007 id Software, Inc. and contributors.
3 For a list of contributors, see the accompanying CONTRIBUTORS file.
5 This file is part of GtkRadiant.
7 GtkRadiant is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 GtkRadiant is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GtkRadiant; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 // l3dslib.c: library for loading triangles from an Alias triangle file
32 #define MAIN3DS 0x4D4D
33 #define EDIT3DS 0x3D3D // this is the start of the editor config
34 #define EDIT_OBJECT 0x4000
35 #define OBJ_TRIMESH 0x4100
36 #define TRI_VERTEXL 0x4110
37 #define TRI_FACEL1 0x4120
45 float fverts[MAXVERTS][3];
46 tri tris[MAXTRIANGLES];
48 int bytesread, level, numtris, totaltris;
49 int vertsfound, trisfound;
54 // Alias stores triangles as 3 explicit vertices in .tri files, so even though we
55 // start out with a vertex pool and vertex indices for triangles, we have to convert
56 // to raw, explicit triangles
57 void StoreAliasTriangles (void)
61 if ((totaltris + numtris) > MAXTRIANGLES)
62 Error ("Error: Too many triangles");
64 for (i=0; i<numtris ; i++)
70 ptri[i+totaltris].verts[j][k] = fverts[tris[i].v[j]][k];
82 int ParseVertexL (FILE *input)
84 int i, j, startbytesread, numverts;
85 unsigned short tshort;
88 Error ("Error: Multiple vertex chunks");
91 startbytesread = bytesread;
94 Error ("Error: unexpected end of file");
96 fread(&tshort, sizeof(tshort), 1, input);
97 bytesread += sizeof(tshort);
98 numverts = (int)tshort;
100 if (numverts > MAXVERTS)
101 Error ("Error: Too many vertices");
103 for (i=0 ; i<numverts ; i++)
105 for (j=0 ; j<3 ; j++)
108 Error ("Error: unexpected end of file");
110 fread(&fverts[i][j], sizeof(float), 1, input);
111 bytesread += sizeof(float);
115 if (vertsfound && trisfound)
116 StoreAliasTriangles ();
118 return bytesread - startbytesread;
122 int ParseFaceL1 (FILE *input)
125 int i, j, startbytesread;
126 unsigned short tshort;
129 Error ("Error: Multiple face chunks");
132 startbytesread = bytesread;
135 Error ("Error: unexpected end of file");
137 fread(&tshort, sizeof(tshort), 1, input);
138 bytesread += sizeof(tshort);
139 numtris = (int)tshort;
141 if (numtris > MAXTRIANGLES)
142 Error ("Error: Too many triangles");
144 for (i=0 ; i<numtris ; i++)
146 for (j=0 ; j<4 ; j++)
149 Error ("Error: unexpected end of file");
151 fread(&tshort, sizeof(tshort), 1, input);
152 bytesread += sizeof(tshort);
153 tris[i].v[j] = (int)tshort;
157 if (vertsfound && trisfound)
158 StoreAliasTriangles ();
160 return bytesread - startbytesread;
164 int ParseChunk (FILE *input)
166 #define BLOCK_SIZE 4096
167 char temp[BLOCK_SIZE];
169 int i, length, w, t, retval;
176 Error ("Error: unexpected end of file");
178 fread(&type, sizeof(type), 1, input);
179 bytesread += sizeof(type);
183 Error ("Error: unexpected end of file");
185 fread (&length, sizeof(length), 1, input);
186 bytesread += sizeof(length);
189 // process chunk if we care about it, otherwise skip it
193 w -= ParseVertexL (input);
197 w -= ParseFaceL1 (input);
207 Error ("Error: unexpected end of file");
209 fread (&temp[i], 1, 1, input);
218 // parse through subchunks
222 w -= ParseChunk (input);
238 Error ("Error: unexpected end of file");
240 fread (&temp, t, 1, input);
256 void Load3DSTriangleList (char *filename, triangle_t **pptri, int *numtriangles)
268 if ((input = fopen(filename, "rb")) == 0) {
269 fprintf(stderr,"reader: could not open file '%s'\n", filename);
273 fread(&tshort, sizeof(tshort), 1, input);
275 // should only be MAIN3DS, but some files seem to start with EDIT3DS, with
277 if ((tshort != MAIN3DS) && (tshort != EDIT3DS)) {
278 fprintf(stderr,"File is not a 3DS file.\n");
282 // back to top of file so we can parse the first chunk descriptor
283 fseek(input, 0, SEEK_SET);
285 ptri = malloc (MAXTRIANGLES * sizeof(triangle_t));
289 // parse through looking for the relevant chunk tree (MAIN3DS | EDIT3DS | EDIT_OBJECT |
290 // OBJ_TRIMESH | {TRI_VERTEXL, TRI_FACEL1}) and skipping other chunks
293 if (vertsfound || trisfound)
294 Error ("Incomplete triangle set");
296 *numtriangles = totaltris;