2 Copyright (C) 1999-2006 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
23 // 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
40 #define MAXTRIANGLES 750
46 float fverts[MAXVERTS][3];
47 tri tris[MAXTRIANGLES];
49 int bytesread, level, numtris, totaltris;
50 int vertsfound, trisfound;
55 // Alias stores triangles as 3 explicit vertices in .tri files, so even though we
56 // start out with a vertex pool and vertex indices for triangles, we have to convert
57 // to raw, explicit triangles
58 void StoreAliasTriangles (void)
62 if ((totaltris + numtris) > MAXTRIANGLES)
63 Error ("Error: Too many triangles");
65 for (i=0; i<numtris ; i++)
71 ptri[i+totaltris].verts[j][k] = fverts[tris[i].v[j]][k];
83 int ParseVertexL (FILE *input)
85 int i, j, startbytesread, numverts;
86 unsigned short tshort;
89 Error ("Error: Multiple vertex chunks");
92 startbytesread = bytesread;
95 Error ("Error: unexpected end of file");
97 fread(&tshort, sizeof(tshort), 1, input);
98 bytesread += sizeof(tshort);
99 numverts = (int)tshort;
101 if (numverts > MAXVERTS)
102 Error ("Error: Too many vertices");
104 for (i=0 ; i<numverts ; i++)
106 for (j=0 ; j<3 ; j++)
109 Error ("Error: unexpected end of file");
111 fread(&fverts[i][j], sizeof(float), 1, input);
112 bytesread += sizeof(float);
116 if (vertsfound && trisfound)
117 StoreAliasTriangles ();
119 return bytesread - startbytesread;
123 int ParseFaceL1 (FILE *input)
126 int i, j, startbytesread;
127 unsigned short tshort;
130 Error ("Error: Multiple face chunks");
133 startbytesread = bytesread;
136 Error ("Error: unexpected end of file");
138 fread(&tshort, sizeof(tshort), 1, input);
139 bytesread += sizeof(tshort);
140 numtris = (int)tshort;
142 if (numtris > MAXTRIANGLES)
143 Error ("Error: Too many triangles");
145 for (i=0 ; i<numtris ; i++)
147 for (j=0 ; j<4 ; j++)
150 Error ("Error: unexpected end of file");
152 fread(&tshort, sizeof(tshort), 1, input);
153 bytesread += sizeof(tshort);
154 tris[i].v[j] = (int)tshort;
158 if (vertsfound && trisfound)
159 StoreAliasTriangles ();
161 return bytesread - startbytesread;
165 int ParseChunk (FILE *input)
167 #define BLOCK_SIZE 4096
168 char temp[BLOCK_SIZE];
170 int i, length, w, t, retval;
177 Error ("Error: unexpected end of file");
179 fread(&type, sizeof(type), 1, input);
180 bytesread += sizeof(type);
184 Error ("Error: unexpected end of file");
186 fread (&length, sizeof(length), 1, input);
187 bytesread += sizeof(length);
190 // process chunk if we care about it, otherwise skip it
194 w -= ParseVertexL (input);
198 w -= ParseFaceL1 (input);
208 Error ("Error: unexpected end of file");
210 fread (&temp[i], 1, 1, input);
219 // parse through subchunks
223 w -= ParseChunk (input);
239 Error ("Error: unexpected end of file");
241 fread (&temp, t, 1, input);
257 void Load3DSTriangleList (char *filename, triangle_t **pptri, int *numtriangles)
269 if ((input = fopen(filename, "rb")) == 0) {
270 fprintf(stderr,"reader: could not open file '%s'\n", filename);
274 fread(&tshort, sizeof(tshort), 1, input);
276 // should only be MAIN3DS, but some files seem to start with EDIT3DS, with
278 if ((tshort != MAIN3DS) && (tshort != EDIT3DS)) {
279 fprintf(stderr,"File is not a 3DS file.\n");
283 // back to top of file so we can parse the first chunk descriptor
284 fseek(input, 0, SEEK_SET);
286 ptri = safe_malloc (MAXTRIANGLES * sizeof(triangle_t));
290 // parse through looking for the relevant chunk tree (MAIN3DS | EDIT3DS | EDIT_OBJECT |
291 // OBJ_TRIMESH | {TRI_VERTEXL, TRI_FACEL1}) and skipping other chunks
294 if (vertsfound || trisfound)
295 Error ("Incomplete triangle set");
297 *numtriangles = totaltris;