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lwoDiscontinuousVertexMap.cxx
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1/**
2 * PANDA 3D SOFTWARE
3 * Copyright (c) Carnegie Mellon University. All rights reserved.
4 *
5 * All use of this software is subject to the terms of the revised BSD
6 * license. You should have received a copy of this license along
7 * with this source code in a file named "LICENSE."
8 *
9 * @file lwoDiscontinuousVertexMap.cxx
10 * @author drose
11 * @date 2001-04-24
12 */
13
15#include "lwoInputFile.h"
16
17#include "dcast.h"
18#include "indent.h"
19
20#include <algorithm>
21
22TypeHandle LwoDiscontinuousVertexMap::_type_handle;
23
24
25/**
26 * Returns true if the map has a value associated with the given index, false
27 * otherwise.
28 */
30has_value(int polygon_index, int vertex_index) const {
31 VMad::const_iterator di;
32 di = _vmad.find(polygon_index);
33 if (di != _vmad.end()) {
34 const VMap &vmap = (*di).second;
35 return (vmap.count(vertex_index) != 0);
36 }
37
38 return false;
39}
40
41/**
42 * Returns the mapping value associated with the given index, or an empty
43 * PTA_stdfloat if there is no mapping value associated.
44 */
46get_value(int polygon_index, int vertex_index) const {
47 VMad::const_iterator di;
48 di = _vmad.find(polygon_index);
49 if (di != _vmad.end()) {
50 const VMap &vmap = (*di).second;
51 VMap::const_iterator vi;
52 vi = vmap.find(vertex_index);
53 if (vi != vmap.end()) {
54 return (*vi).second;
55 }
56 }
57
58 return PTA_stdfloat();
59}
60
61/**
62 * Reads the data of the chunk in from the given input file, if possible. The
63 * ID and length of the chunk have already been read. stop_at is the byte
64 * position of the file to stop at (based on the current position at
65 * in->get_bytes_read()). Returns true on success, false otherwise.
66 */
68read_iff(IffInputFile *in, size_t stop_at) {
69 LwoInputFile *lin = DCAST(LwoInputFile, in);
70
71 _map_type = lin->get_id();
72 _dimension = lin->get_be_uint16();
73 _name = lin->get_string();
74
75 while (lin->get_bytes_read() < stop_at && !lin->is_eof()) {
76 int vertex_index = lin->get_vx();
77 int polygon_index = lin->get_vx();
78
79 PTA_stdfloat value;
80 for (int i = 0; i < _dimension; i++) {
81 value.push_back(lin->get_be_float32());
82 }
83
84 VMap &vmap = _vmad[polygon_index];
85 std::pair<VMap::iterator, bool> ir =
86 vmap.insert(VMap::value_type(vertex_index, value));
87 if (!ir.second) {
88 // This polygonvertex pair was repeated in the vmad. Is it simply
89 // redundant, or is it contradictory?
90 PTA_stdfloat orig_value = (*ir.first).second;
91
92 if (value.v() != orig_value.v()) {
93 nout << "Multiple UV values for vertex " << vertex_index
94 << " of polygon " << polygon_index
95 << " specified by discontinuous vertex map.\n"
96 << "Original value = ";
97
98 PTA_stdfloat::const_iterator vi;
99 for (vi = orig_value.begin(); vi != orig_value.end(); ++vi) {
100 nout << (*vi) << " ";
101 }
102 nout << " new value = ";
103 for (vi = value.begin(); vi != value.end(); ++vi) {
104 nout << (*vi) << " ";
105 }
106 nout << "\n";
107 }
108 }
109 }
110
111 return (lin->get_bytes_read() == stop_at);
112}
113
114/**
115 *
116 */
117void LwoDiscontinuousVertexMap::
118write(std::ostream &out, int indent_level) const {
119 indent(out, indent_level)
120 << get_id() << " { map_type = " << _map_type
121 << ", dimension = " << _dimension
122 << ", name = \"" << _name << "\", "
123 << _vmad.size() << " polygons }\n";
124}
IffId get_id() const
Returns the ID associated with this chunk.
Definition iffChunk.I:25
A wrapper around an istream used for reading an IFF file.
PN_stdfloat get_be_float32()
Extracts a 32-bit big-endian single-precision floating-point number.
uint16_t get_be_uint16()
Extracts an unsigned 16-bit big-endian integer.
IffId get_id()
Extracts a 4-character IFF ID.
size_t get_bytes_read() const
Returns the number of bytes read so far from the input file.
std::string get_string()
Extracts a null-terminated string.
bool is_eof() const
Returns true if the last read operation failed because of reaching EOF, false otherwise.
virtual bool read_iff(IffInputFile *in, size_t stop_at)
Reads the data of the chunk in from the given input file, if possible.
bool has_value(int polygon_index, int vertex_index) const
Returns true if the map has a value associated with the given index, false otherwise.
PTA_stdfloat get_value(int polygon_index, int vertex_index) const
Returns the mapping value associated with the given index, or an empty PTA_stdfloat if there is no ma...
A specialization of IffInputFile to handle reading a Lightwave Object file.
int get_vx()
Reads a Lightwave variable-length index.
TypeHandle is the identifier used to differentiate C++ class types.
Definition typeHandle.h:81
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
std::ostream & indent(std::ostream &out, int indent_level)
A handy function for doing text formatting.
Definition indent.cxx:20
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.