This file is indexed.

/usr/share/perl5/XRacer/BlenderImport.pm is in xracer-tools 0.96.9.1-8.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
# XRACER (C) 1999-2000 Richard W.M. Jones <rich@annexia.org> and other AUTHORS
#
# This program 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.
#
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
#
# $Id: BlenderImport.pm,v 1.1 2000/01/30 12:11:31 rich Exp $

package XRacer::BlenderImport;

use Exporter;

@ISA = qw( Exporter );
@EXPORT = qw(  );

use XRacer::Math;

use strict;

sub parse
  {
    my $class = shift;
    my $filename = shift || "blender.export";

    unless (open IMPORTFILE, $filename)
      {
	warn "$filename: $!";
	return undef;
      }

    my $world = { vertices => [],
		  vertexhash => {},
		  layers => [] };

    bless $world, $class;

    while ($_ = _next_line (\*IMPORTFILE))
      {
	my ($name, $layer, $has_col, $has_uvco, $has_mat)
	  = split /[ \t]+/, $_;

	# Layer is a bitmap of the actual layers in which
	# this object exists. For objects which lie in multiple
	# layers, choose the smallest layer number and print
	# a warning.
	$layer = _get_layer ($name, $layer);

	#warn "reading object: $name (layer $layer)";

	# Read the number of faces.
	unless ($_ = _next_line (\*IMPORTFILE))
	  { warn "$filename: unexpected EOF"; return undef }

	my $nr_faces = $_;
	my @faces = ();

	# Read each face in turn.
	for (my $i = 0; $i < $nr_faces; ++$i)
	  {
	    # Read the number of vertices in this face.
	    unless ($_ = _next_line (\*IMPORTFILE))
	      { warn "$filename: unexpected EOF"; return undef }

	    my $nr_vertices = $_;
	    my @face_vertices = ();

	    # Read each vertex in turn.
	    for (my $j = 0; $j < $nr_vertices; ++$j)
	      {
		# Read the vertex.
		unless ($_ = _next_line (\*IMPORTFILE))
		  { warn "$filename: unexpected EOF"; return undef }

		my ($x, $y, $z, $u, $v, $nx, $ny, $nz);

		if ($has_uvco)
		  {
		    ($x, $y, $z, $u, $v, $nx, $ny, $nz)
		      = split /[ \t]+/, $_;
		  }
		else
		  {
		    $u = $v = 0;
		    ($x, $y, $z, $nx, $ny, $nz)
		      = split /[ \t]+/, $_;
		  }

		# Store the vertex.
		push @face_vertices,
		{ coords => [ $x, $y, $z, 0 ],
		  texcoords => [ $u, $v ],
		  normal => [ $nx, $ny, $nz, 0 ],
		  colour => [ 1, 1, 1, 1 ] };
	      }

	    # Vertex colours?
	    if ($has_col)
	      {
		# Read the number of vertex colours.
		unless ($_ = _next_line (\*IMPORTFILE))
		  { warn "$filename: unexpected EOF"; return undef }

		my $nr_vertex_colours = $_;

		if ($nr_vertex_colours != $nr_vertices)
		  {
		    warn "$filename: number of vertex colours doesn't match number of vertices";
		    return undef;
		  }

		for (my $j = 0; $j < $nr_vertex_colours; ++$j)
		  {
		    # Read the vertex colour.
		    unless ($_ = _next_line (\*IMPORTFILE))
		      { warn "$filename: unexpected EOF"; return undef }

		    my ($r, $g, $b, $a) = split /[ \t]+/, $_;

		    $face_vertices[$j]->{colour} = [ $r, $g, $b, $a ];
		  }
	      }

	    push @faces, { vertices => \@face_vertices };
	  }

	# Read the transformation matrices.
	unless ($_ = _next_line (\*IMPORTFILE))
	  { warn "$filename: unexpected EOF"; return undef }

	my ($sizex, $sizey, $sizez) = split /[ \t]+/, $_;

	unless ($_ = _next_line (\*IMPORTFILE))
	  { warn "$filename: unexpected EOF"; return undef }

	my ($rotx, $roty, $rotz) = split /[ \t]+/, $_;

	unless ($_ = _next_line (\*IMPORTFILE))
	  { warn "$filename: unexpected EOF"; return undef }

	my ($locx, $locy, $locz) = split /[ \t]+/, $_;

	my ($matr, $matg, $matb) = (1, 1, 1);

	if ($has_mat)
	  {
	    # Read the material colour.
	    unless ($_ = _next_line (\*IMPORTFILE))
	      { warn "$filename: unexpected EOF"; return undef }

	    ($matr, $matg, $matb) = split /[ \t]+/, $_;
	  }

	# Transform all the vertices by the rotation matrix
	# so we have the real coordinates. Add vertices onto
	# the global list of vertices.
	my $cosx = cos ($rotx);
	my $sinx = sin ($rotx);

	my $matx = [ [ 1,     0,      0, 0 ],
		     [ 0, $cosx, -$sinx, 0 ],
		     [ 0, $sinx,  $cosx, 0 ],
		     [ 0,     0,      0, 0 ] ];

	my $cosy = cos ($roty);
	my $siny = sin ($roty);

	my $maty = [ [ $cosy,  0, $siny, 0 ],
		     [    0,   1,     0, 0 ],
		     [ -$siny, 0, $cosy, 0 ],
		     [ 0,      0,     0, 0 ] ];

	my $cosz = cos ($rotz);
	my $sinz = sin ($rotz);

	my $matz = [ [ $cosz, -$sinz, 0, 0 ],
		     [ $sinz,  $cosz, 0, 0 ],
		     [     0,      0, 1, 0 ],
		     [     0,      0, 0, 0 ] ];

	my $mat = matrix_multiply (matrix_multiply ($matz, $maty),
				   $matx);

	my $face;
	foreach $face (@faces)
	  {
	    my @face_vertices = ();

	    my $vertex;
	    foreach $vertex (@{$face->{vertices}})
	      {
		$vertex->{coords}
		  = matrix_vector_multiply ($mat, $vertex->{coords});

		$vertex->{coords}[0] *= $sizex;
		$vertex->{coords}[1] *= $sizey;
		$vertex->{coords}[2] *= $sizez;

		$vertex->{coords}[0] += $locx;
		$vertex->{coords}[1] += $locy;
		$vertex->{coords}[2] += $locz;

		$vertex->{normal}
		  = matrix_vector_multiply ($mat, $vertex->{normal});

		my $vertexindex = $world->add_vertex ($vertex);

		push @face_vertices, $vertexindex;
	      }

	    $face->{vertices} = \@face_vertices;
	  }

	# Push the mesh into the appropriate layer.
	unless (defined ($world->{layers}[$layer]))
	  {
	    $world->{layers}[$layer] = [];
	  }

	my $mesh = {
		    name => $name,
		    layer => $layer,
		    faces => \@faces,
		    material => [ $matr, $matg, $matb ],
		    has_colours => $has_col,
		    has_texcoords => $has_uvco,
		    has_material => $has_mat
		   };

	push @{$world->{layers}[$layer]}, $mesh;
      }

    close IMPORTFILE;

    return $world;
  }

sub _next_line
  {
    my $fh = shift;

    while (<$fh>)
      {
	# Remove trailing CR, LF.
	s/[\n\r]+$//;

	# Ignore blank lines, comments.
	next if m/^[ \t]*#/;
	next if m/^[ \t]*$/;

	return $_;
      }

    return undef;
  }

sub _get_layer
  {
    my $name = shift;
    my $layer_in = shift;
    my $layer_out = 0;

    while (($layer_in & 1) == 0)
      {
	$layer_in >>= 1;
	$layer_out ++;
      }

    if ($layer_in != 1)
      {
	warn "object $name is in multiple layers: using layer $layer_out";
      }

    return $layer_out;
  }

sub add_vertex
  {
    my $world = shift;
    my $v = shift;

    my $index;

    my $hashkey = join ",",
                  (
		   $v->{coords}[0],
		   $v->{coords}[1],
		   $v->{coords}[2],
		   $v->{coords}[3],
		   $v->{texcoords}[0],
		   $v->{texcoords}[1],
		   $v->{normal}[0],
		   $v->{normal}[1],
		   $v->{normal}[2],
		   $v->{normal}[3],
		   $v->{colour}[0],
		   $v->{colour}[1],
		   $v->{colour}[2],
		   $v->{colour}[3]
		  );

    if (exists ($world->{vertexhash}{$hashkey}))
      {
	return $world->{vertexhash}{$hashkey};
      }
    else
      {
	push @{$world->{vertices}}, $v;
	$index = @{$world->{vertices}} - 1;
	$world->{vertexhash}{$hashkey} = $index;

	return $index;
      }
  }

sub get_vertices
  {
    my $world = shift;

    return $world->{vertices};
  }

sub get_layer_info
  {
    my $world = shift;
    my @layers = @{$world->{layers}};
    my %info = ();

    for (my $i = 0; $i < @layers; ++$i)
      {
	if (defined ($layers[$i]) && @{$layers[$i]} > 0)
	  {
	    $info{$i} = @{$layers[$i]};
	  }
      }

    return %info;
  }

sub get_meshes_in_layer
  {
    my $world = shift;
    my $layer = shift;

    return @{$world->{layers}[$layer]};
  }

1;
__END__

=head1 NAME

XRacer::BlenderImport - Import files exported by xracer-blenderexport.py

=head1 SYNOPSIS

  use XRacer::BlenderImport;

  $world = parse XRacer::BlenderImport [ $filename ];

  $index = $world->add_vertex ($vertex);
  $verticesref = $world->get_vertices;
  %layerinfo = $world->get_layer_info;

  @objects = $world->get_meshes_in_layer ($layer);

=head1 DESCRIPTION

The C<XRacer::BlenderImport> module contains functions for
importing special XRacer-specific Blender files into Perl scripts.
These Blender files have been previously exported by the
C<xracer-blenderexport.py> Python script for Blender.

The C<XRacer::BlenderImport> module parses the "blender.export"
file, cleans it up (removing multiple vertices, for example)
and presents an internal I<world> representation. The world
is divided into layers (corresponding to the layers in the
original Blender image), and in each of these layers is a
set of meshes.

=head2 FUNDAMENTAL TYPES

Vertices are stored in a global list, so that common vertices
are only stored once. A vertex structure looks like this:

  $vertex = { coords => [ $x, $y, $z, 0 ],
              texcoords => [ $u, $v ],
              normal => [ $nx, $ny, $nz, 0 ],
              colour => [ $r, $g, $b, $a ] };

The fields are (in order): the coordinates of the vertex, the
texture coordinates, the normal vector at this point and the
colour of the vertex.

Faces are stored simply as a list of vertex indices (relative
to the global list of vertices). A face looks like this:

  $face = { vertices => [ $index0, $index1, $index2, ... ] }

Faces have at least three vertices, and maybe more.

A mesh is a list of faces and additional information, such as
the name of the mesh (object). A mesh structure looks like this:

  $mesh = { name => $name,
            layer => $layer,
            faces => \@faces,
            material => [ $red, $green, $blue ],
            has_colours => $has_colours,
            has_texcoords => $has_texcoords,
            has_material => $has_material };

The fields are: the name of the mesh (or object), the layer
on which the object exists, the list of faces, the material
and then three flags which are passed to us from Blender:
did the user supply vertex colours? did the user supply
texture coordinates? and did the user supply a material?

=head1 CLASS METHODS

=over 4

=item $world = parse XRacer::BlenderImport [ $filename ];

Parse the import file C<$filename> (or "blender.export" if
no filename is given) and generate a I<world> representation.
If the file could not be parsed, then this function will print
an error message and return C<undef>.

=back

=head1 OBJECT METHODS

=over 4

=item $index = $world->add_vertex ($vertex)

This function adds a single vertex to the world object (vertices
are stored in a large shared list so that common vertices are
folded into one). It returns the vertex index of the new vertex.
If another vertex with the same position, texture coordinates,
normal and colour existed, then this function would return the
index of the other vertex, rather than creating a fresh vertex
object.

=item $verticesref = $world->get_vertices

This returns a reference to the global list of vertices. You
B<must not> update or change this list. Use the C<add_vertex> method
instead.

=item %layerinfo = $world->get_layer_info

This method returns a hash. The I<keys> of the hash are layers which
contain at least one object. The I<values> of the hash are the number
of objects in that layer.

For example, if the world contained 3 objects on layer 1, 1 object
on layer 2 and 4 objects on layer 5, then the hash returned would
be equivalent to:

  %layerinfo = ( 1 => 3, 2 => 1, 5 => 4 );

=item @objects = $world->get_meshes_in_layer ($layer)

Get a list of the objects (i.e. meshes) found in layer C<$layer>.
See the DESCRIPTION section above for a description of the
mesh structure.

=back

=head1 AUTHOR

  Richard W.M. Jones, <rich@annexia.org>

=head1 COPYRIGHT

XRacer is copyright (C) 1999-2000 Richard W.M. Jones (rich@annexia.org)
and other contributors listed in the AUTHORS file.

=head1 SEE ALSO

L<perl(1)>, L<xracer(6)>.

=cut