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Diffstat (limited to 'common/trilib.c')
| -rwxr-xr-x | common/trilib.c | 231 |
1 files changed, 231 insertions, 0 deletions
diff --git a/common/trilib.c b/common/trilib.c new file mode 100755 index 0000000..34f9e2e --- /dev/null +++ b/common/trilib.c @@ -0,0 +1,231 @@ +/* +=========================================================================== +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);
+}
+
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