ref: 13ca2581f9f18d441ce911e42c2bd93e387cee4d
dir: /common/trilib.c/
/*
===========================================================================
Copyright (C) 1999-2005 Id Software, Inc.
This file is part of Quake III Arena source code.
Quake III Arena source code is free software; you can redistribute it
and/or modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the License,
or (at your option) any later version.
Quake III Arena source code is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Foobar; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
===========================================================================
*/
//
// trilib.c: library for loading triangles from an Alias triangle file
//
#include <stdio.h>
#include "cmdlib.h"
#include "mathlib.h"
#include "polyset.h"
#include "trilib.h"
// on disk representation of a face
#define FLOAT_START 99999.0
#define FLOAT_END -FLOAT_START
#define MAGIC 123322
//#define NOISY 1
typedef struct {
float v[3];
} vector;
typedef struct
{
vector n; /* normal */
vector p; /* point */
vector c; /* color */
float u; /* u */
float v; /* v */
} aliaspoint_t;
typedef struct {
aliaspoint_t pt[3];
} tf_triangle;
static void ByteSwapTri (tf_triangle *tri)
{
int i;
for (i=0 ; i<sizeof(tf_triangle)/4 ; i++)
{
((int *)tri)[i] = BigLong (((int *)tri)[i]);
}
}
static void ReadPolysetGeometry( triangle_t *tripool, FILE *input, int count, triangle_t *ptri )
{
tf_triangle tri;
int i;
for (i = 0; i < count; ++i) {
int j;
fread( &tri, sizeof(tf_triangle), 1, input );
ByteSwapTri (&tri);
for (j=0 ; j<3 ; j++)
{
int k;
for (k=0 ; k<3 ; k++)
{
ptri->verts[j][k] = tri.pt[j].p.v[k];
ptri->normals[j][k] = tri.pt[j].n.v[k];
// ptri->colors[j][k] = tri.pt[j].c.v[k];
}
ptri->texcoords[j][0] = tri.pt[j].u;
ptri->texcoords[j][1] = tri.pt[j].v;
}
ptri++;
if ((ptri - tripool ) >= POLYSET_MAXTRIANGLES)
Error ("Error: too many triangles; increase POLYSET_MAXTRIANGLES\n");
}
}
void TRI_LoadPolysets( const char *filename, polyset_t **ppPSET, int *numpsets )
{
FILE *input;
float start;
char name[256], tex[256];
int i, count, magic, pset = 0;
triangle_t *ptri;
polyset_t *pPSET;
int iLevel;
int exitpattern;
float t;
t = -FLOAT_START;
*((unsigned char *)&exitpattern + 0) = *((unsigned char *)&t + 3);
*((unsigned char *)&exitpattern + 1) = *((unsigned char *)&t + 2);
*((unsigned char *)&exitpattern + 2) = *((unsigned char *)&t + 1);
*((unsigned char *)&exitpattern + 3) = *((unsigned char *)&t + 0);
if ((input = fopen(filename, "rb")) == 0)
Error ("reader: could not open file '%s'", filename);
iLevel = 0;
fread(&magic, sizeof(int), 1, input);
if (BigLong(magic) != MAGIC)
Error ("%s is not a Alias object separated triangle file, magic number is wrong.", filename);
pPSET = calloc( 1, POLYSET_MAXPOLYSETS * sizeof( polyset_t ) );
ptri = calloc( 1, POLYSET_MAXTRIANGLES * sizeof( triangle_t ) );
*ppPSET = pPSET;
while (feof(input) == 0) {
if (fread(&start, sizeof(float), 1, input) < 1)
break;
*(int *)&start = BigLong(*(int *)&start);
if (*(int *)&start != exitpattern)
{
if (start == FLOAT_START) {
/* Start of an object or group of objects. */
i = -1;
do {
/* There are probably better ways to read a string from */
/* a file, but this does allow you to do error checking */
/* (which I'm not doing) on a per character basis. */
++i;
fread( &(name[i]), sizeof( char ), 1, input);
} while( name[i] != '\0' );
if ( i != 0 )
strncpy( pPSET[pset].name, name, sizeof( pPSET[pset].name ) - 1 );
else
strcpy( pPSET[pset].name , "(unnamed)" );
strlwr( pPSET[pset].name );
// indent();
// fprintf(stdout,"OBJECT START: %s\n",name);
fread( &count, sizeof(int), 1, input);
count = BigLong(count);
++iLevel;
if (count != 0) {
// indent();
// fprintf(stdout,"NUMBER OF TRIANGLES: %d\n",count);
i = -1;
do {
++i;
fread( &(tex[i]), sizeof( char ), 1, input);
} while( tex[i] != '\0' );
/*
if ( i != 0 )
strncpy( pPSET[pset].texname, tex, sizeof( pPSET[pset].texname ) - 1 );
else
strcpy( pPSET[pset].texname, "(unnamed)" );
strlwr( pPSET[pset].texname );
*/
// indent();
// fprintf(stdout," Object texture name: '%s'\n",tex);
}
/* Else (count == 0) this is the start of a group, and */
/* no texture name is present. */
}
else if (start == FLOAT_END) {
/* End of an object or group. Yes, the name should be */
/* obvious from context, but it is in here just to be */
/* safe and to provide a little extra information for */
/* those who do not wish to write a recursive reader. */
/* Mea culpa. */
--iLevel;
i = -1;
do {
++i;
fread( &(name[i]), sizeof( char ), 1, input);
} while( name[i] != '\0' );
if ( i != 0 )
strncpy( pPSET[pset].name, name, sizeof( pPSET[pset].name ) - 1 );
else
strcpy( pPSET[pset].name , "(unnamed)" );
strlwr( pPSET[pset].name );
// indent();
// fprintf(stdout,"OBJECT END: %s\n",name);
continue;
}
}
//
// read the triangles
//
if ( count > 0 )
{
pPSET[pset].triangles = ptri;
ReadPolysetGeometry( pPSET[0].triangles, input, count, ptri );
ptri += count;
pPSET[pset].numtriangles = count;
if ( ++pset >= POLYSET_MAXPOLYSETS )
{
Error ("Error: too many polysets; increase POLYSET_MAXPOLYSETS\n");
}
}
}
*numpsets = pset;
fclose (input);
}