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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231
common/trilib.c
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231
common/trilib.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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// trilib.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 "polyset.h"
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#include "trilib.h"
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// on disk representation of a face
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#define FLOAT_START 99999.0
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#define FLOAT_END -FLOAT_START
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#define MAGIC 123322
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//#define NOISY 1
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typedef struct {
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float v[3];
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} vector;
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typedef struct
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{
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vector n; /* normal */
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vector p; /* point */
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vector c; /* color */
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float u; /* u */
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float v; /* v */
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} aliaspoint_t;
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typedef struct {
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aliaspoint_t pt[3];
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} tf_triangle;
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static void ByteSwapTri (tf_triangle *tri)
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{
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int i;
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for (i=0 ; i<sizeof(tf_triangle)/4 ; i++)
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{
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((int *)tri)[i] = BigLong (((int *)tri)[i]);
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}
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}
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static void ReadPolysetGeometry( triangle_t *tripool, FILE *input, int count, triangle_t *ptri )
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{
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tf_triangle tri;
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int i;
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for (i = 0; i < count; ++i) {
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int j;
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fread( &tri, sizeof(tf_triangle), 1, input );
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ByteSwapTri (&tri);
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for (j=0 ; j<3 ; j++)
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{
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int k;
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for (k=0 ; k<3 ; k++)
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{
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ptri->verts[j][k] = tri.pt[j].p.v[k];
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ptri->normals[j][k] = tri.pt[j].n.v[k];
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// ptri->colors[j][k] = tri.pt[j].c.v[k];
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}
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ptri->texcoords[j][0] = tri.pt[j].u;
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ptri->texcoords[j][1] = tri.pt[j].v;
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}
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ptri++;
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if ((ptri - tripool ) >= POLYSET_MAXTRIANGLES)
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Error ("Error: too many triangles; increase POLYSET_MAXTRIANGLES\n");
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}
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}
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void TRI_LoadPolysets( const char *filename, polyset_t **ppPSET, int *numpsets )
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{
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FILE *input;
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float start;
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char name[256], tex[256];
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int i, count, magic, pset = 0;
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triangle_t *ptri;
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polyset_t *pPSET;
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int iLevel;
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int exitpattern;
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float t;
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t = -FLOAT_START;
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*((unsigned char *)&exitpattern + 0) = *((unsigned char *)&t + 3);
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*((unsigned char *)&exitpattern + 1) = *((unsigned char *)&t + 2);
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*((unsigned char *)&exitpattern + 2) = *((unsigned char *)&t + 1);
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*((unsigned char *)&exitpattern + 3) = *((unsigned char *)&t + 0);
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if ((input = fopen(filename, "rb")) == 0)
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Error ("reader: could not open file '%s'", filename);
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iLevel = 0;
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fread(&magic, sizeof(int), 1, input);
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if (BigLong(magic) != MAGIC)
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Error ("%s is not a Alias object separated triangle file, magic number is wrong.", filename);
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pPSET = calloc( 1, POLYSET_MAXPOLYSETS * sizeof( polyset_t ) );
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ptri = calloc( 1, POLYSET_MAXTRIANGLES * sizeof( triangle_t ) );
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*ppPSET = pPSET;
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while (feof(input) == 0) {
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if (fread(&start, sizeof(float), 1, input) < 1)
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break;
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*(int *)&start = BigLong(*(int *)&start);
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if (*(int *)&start != exitpattern)
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{
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if (start == FLOAT_START) {
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/* Start of an object or group of objects. */
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i = -1;
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do {
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/* There are probably better ways to read a string from */
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/* a file, but this does allow you to do error checking */
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/* (which I'm not doing) on a per character basis. */
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++i;
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fread( &(name[i]), sizeof( char ), 1, input);
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} while( name[i] != '\0' );
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if ( i != 0 )
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strncpy( pPSET[pset].name, name, sizeof( pPSET[pset].name ) - 1 );
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else
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strcpy( pPSET[pset].name , "(unnamed)" );
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strlwr( pPSET[pset].name );
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// indent();
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// fprintf(stdout,"OBJECT START: %s\n",name);
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fread( &count, sizeof(int), 1, input);
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count = BigLong(count);
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++iLevel;
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if (count != 0) {
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// indent();
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// fprintf(stdout,"NUMBER OF TRIANGLES: %d\n",count);
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i = -1;
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do {
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++i;
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fread( &(tex[i]), sizeof( char ), 1, input);
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} while( tex[i] != '\0' );
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/*
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if ( i != 0 )
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strncpy( pPSET[pset].texname, tex, sizeof( pPSET[pset].texname ) - 1 );
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else
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strcpy( pPSET[pset].texname, "(unnamed)" );
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strlwr( pPSET[pset].texname );
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*/
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// indent();
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// fprintf(stdout," Object texture name: '%s'\n",tex);
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}
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/* Else (count == 0) this is the start of a group, and */
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/* no texture name is present. */
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}
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else if (start == FLOAT_END) {
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/* End of an object or group. Yes, the name should be */
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/* obvious from context, but it is in here just to be */
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/* safe and to provide a little extra information for */
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/* those who do not wish to write a recursive reader. */
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/* Mea culpa. */
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--iLevel;
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i = -1;
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do {
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++i;
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fread( &(name[i]), sizeof( char ), 1, input);
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} while( name[i] != '\0' );
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if ( i != 0 )
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strncpy( pPSET[pset].name, name, sizeof( pPSET[pset].name ) - 1 );
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else
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strcpy( pPSET[pset].name , "(unnamed)" );
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strlwr( pPSET[pset].name );
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// indent();
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// fprintf(stdout,"OBJECT END: %s\n",name);
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continue;
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}
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}
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//
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// read the triangles
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//
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if ( count > 0 )
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{
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pPSET[pset].triangles = ptri;
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ReadPolysetGeometry( pPSET[0].triangles, input, count, ptri );
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ptri += count;
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pPSET[pset].numtriangles = count;
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if ( ++pset >= POLYSET_MAXPOLYSETS )
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{
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Error ("Error: too many polysets; increase POLYSET_MAXPOLYSETS\n");
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}
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}
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}
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*numpsets = pset;
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fclose (input);
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}
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