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136 lines
4.0 KiB
C++
136 lines
4.0 KiB
C++
// Filename: load_egg_file.cxx
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// Created by: drose (26Feb02)
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//
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////////////////////////////////////////////////////////////////////
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//
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// PANDA 3D SOFTWARE
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// Copyright (c) 2001, Disney Enterprises, Inc. All rights reserved
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//
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// All use of this software is subject to the terms of the Panda 3d
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// Software license. You should have received a copy of this license
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// along with this source code; you will also find a current copy of
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// the license at http://www.panda3d.org/license.txt .
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//
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// To contact the maintainers of this program write to
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// panda3d@yahoogroups.com .
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//
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////////////////////////////////////////////////////////////////////
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#include "load_egg_file.h"
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#include "eggLoader.h"
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#include "config_egg2pg.h"
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#include "sceneGraphReducer.h"
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#include "virtualFileSystem.h"
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#include "config_util.h"
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static PT(PandaNode)
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load_from_loader(EggLoader &loader) {
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loader._data.resolve_externals();
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loader.build_graph();
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if (loader._error && !egg_accept_errors) {
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egg2pg_cat.error()
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<< "Errors in egg file.\n";
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return NULL;
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}
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if (loader._root != (PandaNode *)NULL && egg_flatten) {
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SceneGraphReducer gr;
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int num_reduced = gr.flatten(loader._root, egg_flatten_siblings);
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egg2pg_cat.info() << "Flattened " << num_reduced << " nodes.\n";
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}
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return loader._root;
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}
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////////////////////////////////////////////////////////////////////
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// Function: load_egg_file
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// Description: A convenience function. Loads up the indicated egg
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// file, and returns the root of a scene graph. Returns
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// NULL if the file cannot be read for some reason.
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// Does not search along the egg path for the filename
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// first; use EggData::resolve_egg_filename() if this is
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// required.
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////////////////////////////////////////////////////////////////////
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PT(PandaNode)
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load_egg_file(const string &filename, CoordinateSystem cs) {
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Filename egg_filename = Filename::text_filename(filename);
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if (use_vfs) {
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VirtualFileSystem *vfs = VirtualFileSystem::get_global_ptr();
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if (!vfs->exists(egg_filename)) {
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egg2pg_cat.error()
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<< "Could not find " << egg_filename << "\n";
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return NULL;
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}
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} else {
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if (!egg_filename.exists()) {
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egg2pg_cat.error()
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<< "Could not find " << egg_filename << "\n";
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return NULL;
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}
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}
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egg2pg_cat.info()
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<< "Reading " << egg_filename << "\n";
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EggLoader loader;
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loader._data.set_egg_filename(egg_filename);
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if (cs != CS_default) {
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loader._data.set_coordinate_system(cs);
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}
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bool okflag;
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if (use_vfs) {
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VirtualFileSystem *vfs = VirtualFileSystem::get_global_ptr();
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istream *istr = vfs->open_read_file(egg_filename);
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if (istr == (istream *)NULL) {
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egg2pg_cat.error()
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<< "Could not open " << egg_filename << " for reading.\n";
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return NULL;
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}
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okflag = loader._data.read(*istr);
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delete istr;
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} else {
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ifstream file;
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if (!egg_filename.open_read(file)) {
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egg2pg_cat.error()
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<< "Could not open " << egg_filename << " for reading.\n";
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return NULL;
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}
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okflag = loader._data.read(file);
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}
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if (!okflag) {
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egg2pg_cat.error()
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<< "Error reading " << egg_filename << "\n";
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return NULL;
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}
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return load_from_loader(loader);
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}
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////////////////////////////////////////////////////////////////////
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// Function: load_egg_data
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// Description: Another convenience function; works like
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// load_egg_file() but starts from an already-filled
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// EggData structure. The structure is destroyed in the
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// loading.
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////////////////////////////////////////////////////////////////////
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PT(PandaNode)
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load_egg_data(EggData &data) {
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// We temporarily shuttle the children to a holding node so we can
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// copy them into the EggLoader's structure without it complaining.
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EggGroupNode children_holder;
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children_holder.steal_children(data);
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EggLoader loader(data);
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loader._data.steal_children(children_holder);
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return load_from_loader(loader);
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}
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