The Quake III Arena sources as originally released under the GPL license on August 20, 2005.
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Travis Bradshaw
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300
common/l3dslib.c
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300
common/l3dslib.c
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/*
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===========================================================================
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Copyright (C) 1999-2005 Id Software, Inc.
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This file is part of Quake III Arena source code.
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Quake III Arena source code is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the License,
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or (at your option) any later version.
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Quake III Arena source code is distributed in the hope that it will be
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useful, 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 Foobar; 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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//
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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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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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{
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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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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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{
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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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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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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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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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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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return bytesread - startbytesread;
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}
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int ParseFaceL1 (FILE *input)
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{
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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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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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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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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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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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return bytesread - startbytesread;
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}
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int ParseChunk (FILE *input)
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{
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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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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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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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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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if (feof(input))
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Error ("Error: unexpected end of file");
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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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{
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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 = 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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*numtriangles = totaltris;
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fclose (input);
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}
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