mirror of
https://github.com/TTimo/GtkRadiant.git
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312 lines
6.2 KiB
C
312 lines
6.2 KiB
C
/*
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Copyright (C) 1999-2007 id Software, Inc. and contributors.
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For a list of contributors, see the accompanying CONTRIBUTORS file.
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This file is part of GtkRadiant.
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GtkRadiant is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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GtkRadiant is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GtkRadiant; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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//
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// l3dslib.c: library for loading triangles from an Alias triangle file
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//
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#include <stdio.h>
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#include "cmdlib.h"
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#include "mathlib.h"
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#include "trilib.h"
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#include "l3dslib.h"
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#define MAIN3DS 0x4D4D
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#define EDIT3DS 0x3D3D // this is the start of the editor config
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#define EDIT_OBJECT 0x4000
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#define OBJ_TRIMESH 0x4100
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#define TRI_VERTEXL 0x4110
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#define TRI_FACEL1 0x4120
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#define MAXVERTS 2000
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#define MAXTRIANGLES 750
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typedef struct {
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int v[4];
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} tri;
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float fverts[MAXVERTS][3];
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tri tris[MAXTRIANGLES];
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int bytesread, level, numtris, totaltris;
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int vertsfound, trisfound;
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triangle_t *ptri;
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// Alias stores triangles as 3 explicit vertices in .tri files, so even though we
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// start out with a vertex pool and vertex indices for triangles, we have to convert
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// to raw, explicit triangles
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void StoreAliasTriangles( void ){
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int i, j, k;
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if ( ( totaltris + numtris ) > MAXTRIANGLES ) {
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Error( "Error: Too many triangles" );
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}
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for ( i = 0; i < numtris ; i++ )
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{
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for ( j = 0 ; j < 3 ; j++ )
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{
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for ( k = 0 ; k < 3 ; k++ )
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{
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ptri[i + totaltris].verts[j][k] = fverts[tris[i].v[j]][k];
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}
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}
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}
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totaltris += numtris;
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numtris = 0;
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vertsfound = 0;
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trisfound = 0;
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}
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int ParseVertexL( FILE *input ){
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int i, j, startbytesread, numverts;
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unsigned short tshort;
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if ( vertsfound ) {
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Error( "Error: Multiple vertex chunks" );
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}
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vertsfound = 1;
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startbytesread = bytesread;
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if ( feof( input ) ) {
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Error( "Error: unexpected end of file" );
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}
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fread( &tshort, sizeof( tshort ), 1, input );
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bytesread += sizeof( tshort );
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numverts = (int)tshort;
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if ( numverts > MAXVERTS ) {
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Error( "Error: Too many vertices" );
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}
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for ( i = 0 ; i < numverts ; i++ )
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{
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for ( j = 0 ; j < 3 ; j++ )
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{
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if ( feof( input ) ) {
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Error( "Error: unexpected end of file" );
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}
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fread( &fverts[i][j], sizeof( float ), 1, input );
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bytesread += sizeof( float );
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}
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}
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if ( vertsfound && trisfound ) {
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StoreAliasTriangles();
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}
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return bytesread - startbytesread;
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}
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int ParseFaceL1( FILE *input ){
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int i, j, startbytesread;
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unsigned short tshort;
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if ( trisfound ) {
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Error( "Error: Multiple face chunks" );
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}
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trisfound = 1;
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startbytesread = bytesread;
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if ( feof( input ) ) {
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Error( "Error: unexpected end of file" );
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}
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fread( &tshort, sizeof( tshort ), 1, input );
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bytesread += sizeof( tshort );
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numtris = (int)tshort;
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if ( numtris > MAXTRIANGLES ) {
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Error( "Error: Too many triangles" );
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}
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for ( i = 0 ; i < numtris ; i++ )
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{
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for ( j = 0 ; j < 4 ; j++ )
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{
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if ( feof( input ) ) {
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Error( "Error: unexpected end of file" );
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}
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fread( &tshort, sizeof( tshort ), 1, input );
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bytesread += sizeof( tshort );
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tris[i].v[j] = (int)tshort;
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}
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}
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if ( vertsfound && trisfound ) {
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StoreAliasTriangles();
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}
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return bytesread - startbytesread;
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}
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int ParseChunk( FILE *input ){
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#define BLOCK_SIZE 4096
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char temp[BLOCK_SIZE];
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unsigned short type;
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int i, length, w, t, retval;
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level++;
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retval = 0;
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// chunk type
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if ( feof( input ) ) {
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Error( "Error: unexpected end of file" );
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}
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fread( &type, sizeof( type ), 1, input );
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bytesread += sizeof( type );
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// chunk length
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if ( feof( input ) ) {
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Error( "Error: unexpected end of file" );
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}
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fread( &length, sizeof( length ), 1, input );
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bytesread += sizeof( length );
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w = length - 6;
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// process chunk if we care about it, otherwise skip it
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switch ( type )
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{
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case TRI_VERTEXL:
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w -= ParseVertexL( input );
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goto ParseSubchunk;
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case TRI_FACEL1:
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w -= ParseFaceL1( input );
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goto ParseSubchunk;
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case EDIT_OBJECT:
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// read the name
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i = 0;
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do
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{
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if ( feof( input ) ) {
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Error( "Error: unexpected end of file" );
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}
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fread( &temp[i], 1, 1, input );
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i++;
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w--;
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bytesread++;
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} while ( temp[i - 1] );
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case MAIN3DS:
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case OBJ_TRIMESH:
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case EDIT3DS:
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// parse through subchunks
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ParseSubchunk:
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while ( w > 0 )
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{
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w -= ParseChunk( input );
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}
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retval = length;
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goto Done;
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default:
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// skip other chunks
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while ( w > 0 )
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{
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t = w;
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if ( t > BLOCK_SIZE ) {
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t = BLOCK_SIZE;
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}
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if ( feof( input ) ) {
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Error( "Error: unexpected end of file" );
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}
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fread( &temp, t, 1, input );
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bytesread += t;
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w -= t;
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}
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retval = length;
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goto Done;
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}
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Done:
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level--;
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return retval;
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}
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void Load3DSTriangleList( char *filename, triangle_t **pptri, int *numtriangles ){
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FILE *input;
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short int tshort;
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bytesread = 0;
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level = 0;
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numtris = 0;
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totaltris = 0;
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vertsfound = 0;
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trisfound = 0;
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if ( ( input = fopen( filename, "rb" ) ) == 0 ) {
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fprintf( stderr,"reader: could not open file '%s'\n", filename );
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exit( 0 );
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}
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fread( &tshort, sizeof( tshort ), 1, input );
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// should only be MAIN3DS, but some files seem to start with EDIT3DS, with
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// no MAIN3DS
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if ( ( tshort != MAIN3DS ) && ( tshort != EDIT3DS ) ) {
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fprintf( stderr,"File is not a 3DS file.\n" );
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exit( 0 );
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}
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// back to top of file so we can parse the first chunk descriptor
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fseek( input, 0, SEEK_SET );
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ptri = safe_malloc( MAXTRIANGLES * sizeof( triangle_t ) );
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*pptri = ptri;
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// parse through looking for the relevant chunk tree (MAIN3DS | EDIT3DS | EDIT_OBJECT |
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// OBJ_TRIMESH | {TRI_VERTEXL, TRI_FACEL1}) and skipping other chunks
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ParseChunk( input );
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if ( vertsfound || trisfound ) {
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Error( "Incomplete triangle set" );
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}
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*numtriangles = totaltris;
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fclose( input );
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}
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