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 ){
61 if ( ( totaltris + numtris ) > MAXTRIANGLES ) {
62 Error( "Error: Too many triangles" );
65 for ( i = 0; i < numtris ; i++ )
67 for ( j = 0 ; j < 3 ; j++ )
69 for ( k = 0 ; k < 3 ; k++ )
71 ptri[i + totaltris].verts[j][k] = fverts[tris[i].v[j]][k];
83 int ParseVertexL( FILE *input ){
84 int i, j, startbytesread, numverts;
85 unsigned short tshort;
88 Error( "Error: Multiple vertex chunks" );
92 startbytesread = bytesread;
94 if ( feof( input ) ) {
95 Error( "Error: unexpected end of file" );
98 fread( &tshort, sizeof( tshort ), 1, input );
99 bytesread += sizeof( tshort );
100 numverts = (int)tshort;
102 if ( numverts > MAXVERTS ) {
103 Error( "Error: Too many vertices" );
106 for ( i = 0 ; i < numverts ; i++ )
108 for ( j = 0 ; j < 3 ; j++ )
110 if ( feof( input ) ) {
111 Error( "Error: unexpected end of file" );
114 fread( &fverts[i][j], sizeof( float ), 1, input );
115 bytesread += sizeof( float );
119 if ( vertsfound && trisfound ) {
120 StoreAliasTriangles();
123 return bytesread - startbytesread;
127 int ParseFaceL1( FILE *input ){
129 int i, j, startbytesread;
130 unsigned short tshort;
133 Error( "Error: Multiple face chunks" );
137 startbytesread = bytesread;
139 if ( feof( input ) ) {
140 Error( "Error: unexpected end of file" );
143 fread( &tshort, sizeof( tshort ), 1, input );
144 bytesread += sizeof( tshort );
145 numtris = (int)tshort;
147 if ( numtris > MAXTRIANGLES ) {
148 Error( "Error: Too many triangles" );
151 for ( i = 0 ; i < numtris ; i++ )
153 for ( j = 0 ; j < 4 ; j++ )
155 if ( feof( input ) ) {
156 Error( "Error: unexpected end of file" );
159 fread( &tshort, sizeof( tshort ), 1, input );
160 bytesread += sizeof( tshort );
161 tris[i].v[j] = (int)tshort;
165 if ( vertsfound && trisfound ) {
166 StoreAliasTriangles();
169 return bytesread - startbytesread;
173 int ParseChunk( FILE *input ){
174 #define BLOCK_SIZE 4096
175 char temp[BLOCK_SIZE];
177 int i, length, w, t, retval;
183 if ( feof( input ) ) {
184 Error( "Error: unexpected end of file" );
187 fread( &type, sizeof( type ), 1, input );
188 bytesread += sizeof( type );
191 if ( feof( input ) ) {
192 Error( "Error: unexpected end of file" );
195 fread( &length, sizeof( length ), 1, input );
196 bytesread += sizeof( length );
199 // process chunk if we care about it, otherwise skip it
203 w -= ParseVertexL( input );
207 w -= ParseFaceL1( input );
216 if ( feof( input ) ) {
217 Error( "Error: unexpected end of file" );
220 fread( &temp[i], 1, 1, input );
224 } while ( temp[i - 1] );
229 // parse through subchunks
233 w -= ParseChunk( input );
245 if ( t > BLOCK_SIZE ) {
249 if ( feof( input ) ) {
250 Error( "Error: unexpected end of file" );
253 fread( &temp, t, 1, input );
269 void Load3DSTriangleList( char *filename, triangle_t **pptri, int *numtriangles ){
280 if ( ( input = fopen( filename, "rb" ) ) == 0 ) {
281 fprintf( stderr,"reader: could not open file '%s'\n", filename );
285 fread( &tshort, sizeof( tshort ), 1, input );
287 // should only be MAIN3DS, but some files seem to start with EDIT3DS, with
289 if ( ( tshort != MAIN3DS ) && ( tshort != EDIT3DS ) ) {
290 fprintf( stderr,"File is not a 3DS file.\n" );
294 // back to top of file so we can parse the first chunk descriptor
295 fseek( input, 0, SEEK_SET );
297 ptri = safe_malloc( MAXTRIANGLES * sizeof( triangle_t ) );
301 // parse through looking for the relevant chunk tree (MAIN3DS | EDIT3DS | EDIT_OBJECT |
302 // OBJ_TRIMESH | {TRI_VERTEXL, TRI_FACEL1}) and skipping other chunks
305 if ( vertsfound || trisfound ) {
306 Error( "Incomplete triangle set" );
309 *numtriangles = totaltris;