Panda3D

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load_egg_file.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 load_egg_file.cxx
10 * @author drose
11 * @date 2002-02-26
12 */
13
14#include "load_egg_file.h"
15#include "eggLoader.h"
16#include "config_egg2pg.h"
17#include "sceneGraphReducer.h"
18#include "virtualFileSystem.h"
19#include "config_putil.h"
20#include "bamCacheRecord.h"
21
22 static PT(PandaNode)
23load_from_loader(EggLoader &loader) {
24 loader._data->load_externals(DSearchPath(), loader._record);
25
26 loader.build_graph();
27
28 if (loader._error && !egg_accept_errors) {
29 egg2pg_cat.error()
30 << "Errors in egg file.\n";
31 return nullptr;
32 }
33
34 if (loader._root != nullptr && egg_flatten) {
35 SceneGraphReducer gr;
36
37 int combine_siblings_bits = 0;
38 if (egg_combine_geoms) {
39 combine_siblings_bits |= SceneGraphReducer::CS_geom_node;
40 }
41 if (egg_flatten_radius > 0.0) {
42 combine_siblings_bits |= SceneGraphReducer::CS_within_radius;
43 gr.set_combine_radius(egg_flatten_radius);
44 }
45
46 int num_reduced = gr.flatten(loader._root, combine_siblings_bits);
47 egg2pg_cat.info() << "Flattened " << num_reduced << " nodes.\n";
48
49 if (egg_unify) {
50 // We want to premunge before unifying, since otherwise we risk
51 // needlessly duplicating vertices.
52 if (premunge_data) {
53 gr.premunge(loader._root, RenderState::make_empty());
54 }
55 gr.collect_vertex_data(loader._root);
56 gr.unify(loader._root, true);
57 if (egg2pg_cat.is_debug()) {
58 egg2pg_cat.debug() << "Unified.\n";
59 }
60 }
61 }
62
63 return loader._root;
64}
65
66/**
67 * A convenience function. Loads up the indicated egg file, and returns the
68 * root of a scene graph. Returns NULL if the file cannot be read for some
69 * reason. Does not search along the egg path for the filename first; use
70 * EggData::resolve_egg_filename() if this is required.
71 */
72PT(PandaNode)
73load_egg_file(const Filename &filename, CoordinateSystem cs,
74 BamCacheRecord *record) {
75 Filename egg_filename = filename;
76 egg_filename.set_text();
77 VirtualFileSystem *vfs = VirtualFileSystem::get_global_ptr();
78
79 if (record != nullptr) {
80 record->add_dependent_file(egg_filename);
81 }
82
83 EggLoader loader;
84 loader._data->set_egg_filename(egg_filename);
85 loader._data->set_auto_resolve_externals(true);
86 loader._data->set_coordinate_system(cs);
87 loader._record = record;
88
89 PT(VirtualFile) vfile = vfs->get_file(egg_filename);
90 if (vfile == nullptr) {
91 return nullptr;
92 }
93
94 loader._data->set_egg_timestamp(vfile->get_timestamp());
95
96 bool okflag;
97 std::istream *istr = vfile->open_read_file(true);
98 if (istr == nullptr) {
99 egg2pg_cat.error()
100 << "Couldn't read " << egg_filename << "\n";
101 return nullptr;
102 }
103
104 egg2pg_cat.info()
105 << "Reading " << egg_filename << "\n";
106
107 okflag = loader._data->read(*istr);
108 vfile->close_read_file(istr);
109
110 if (!okflag) {
111 egg2pg_cat.error()
112 << "Error reading " << egg_filename << "\n";
113 return nullptr;
114 }
115
116 return load_from_loader(loader);
117}
118
119/**
120 * Another convenience function; works like load_egg_file() but starts from an
121 * already-filled EggData structure. The structure is destroyed in the
122 * loading.
123 */
124PT(PandaNode)
125load_egg_data(EggData *data, CoordinateSystem cs) {
126 // We temporarily shuttle the children to a holding node so we can copy them
127 // into the EggLoader's structure without it complaining.
128 EggGroupNode children_holder;
129 children_holder.steal_children(*data);
130
131 EggLoader loader(data);
132 loader._data->steal_children(children_holder);
133
134 loader._data->set_auto_resolve_externals(true);
135 loader._data->set_coordinate_system(cs);
136
137 return load_from_loader(loader);
138}
bamCacheRecord.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
BamCacheRecord
An instance of this class is written to the front of a Bam or Txo file to make the file a cached inst...
Definition bamCacheRecord.h:36
DSearchPath
This class stores a list of directories that can be searched, in order, to locate a particular file.
Definition dSearchPath.h:28
EggData
This is the primary interface into all the egg data, and the root of the egg file structure.
Definition eggData.h:37
EggGroupNode
A base class for nodes in the hierarchy that are not leaf nodes.
Definition eggGroupNode.h:46
EggGroupNode::steal_children
void steal_children(EggGroupNode &other)
Moves all the children from the other node to this one.
Definition eggGroupNode.cxx:278
EggLoader
Converts an egg data structure, possibly read from an egg file but not necessarily,...
Definition eggLoader.h:67
Filename
The name of a file, such as a texture file or an Egg file.
Definition filename.h:44
Filename::set_text
void set_text()
Indicates that the filename represents a text file.
Definition filename.I:424
PandaNode
A basic node of the scene graph or data graph.
Definition pandaNode.h:65
SceneGraphReducer
An interface for simplifying ("flattening") scene graphs by eliminating unneeded nodes and collapsing...
Definition sceneGraphReducer.h:39
SceneGraphReducer::collect_vertex_data
int collect_vertex_data(PandaNode *root, int collect_bits=~0)
Collects all different GeomVertexData blocks that have compatible formats at this node and below into...
Definition sceneGraphReducer.I:139
SceneGraphReducer::set_combine_radius
void set_combine_radius(PN_stdfloat combine_radius)
Specifies the radius that is used in conjunction with CS_within_radius to decide whether a subgraph's...
Definition sceneGraphReducer.I:52
SceneGraphReducer::flatten
int flatten(PandaNode *root, int combine_siblings_bits)
Simplifies the graph by removing unnecessary nodes and nodes.
Definition sceneGraphReducer.cxx:85
SceneGraphReducer::unify
void unify(PandaNode *root, bool preserve_order)
Calls unify() on every GeomNode at this level and below.
Definition sceneGraphReducer.cxx:178
SceneGraphReducer::premunge
void premunge(PandaNode *root, const RenderState *initial_state)
Walks the scene graph rooted at this node and below, and uses the indicated GSG to premunge every Geo...
Definition sceneGraphReducer.I:173
VirtualFileSystem
A hierarchy of directories and files that appears to be one continuous file system,...
Definition virtualFileSystem.h:40
VirtualFileSystem::get_global_ptr
static VirtualFileSystem * get_global_ptr()
Returns the default global VirtualFileSystem.
Definition virtualFileSystem.cxx:741
VirtualFile
The abstract base class for a file or directory within the VirtualFileSystem.
Definition virtualFile.h:35
config_egg2pg.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
config_putil.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
eggLoader.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
load_egg_file.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
sceneGraphReducer.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
virtualFileSystem.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.