113 lines
5.3 KiB
C++
113 lines
5.3 KiB
C++
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//----------------------------------------------------------------------------//
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// //
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// ozz-animation is hosted at http://github.com/guillaumeblanc/ozz-animation //
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// and distributed under the MIT License (MIT). //
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// //
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// Copyright (c) Guillaume Blanc //
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// //
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// Permission is hereby granted, free of charge, to any person obtaining a //
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// copy of this software and associated documentation files (the "Software"), //
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// to deal in the Software without restriction, including without limitation //
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// the rights to use, copy, modify, merge, publish, distribute, sublicense, //
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// and/or sell copies of the Software, and to permit persons to whom the //
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// Software is furnished to do so, subject to the following conditions: //
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// //
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// The above copyright notice and this permission notice shall be included in //
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// all copies or substantial portions of the Software. //
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// //
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR //
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, //
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL //
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// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER //
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING //
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER //
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// DEALINGS IN THE SOFTWARE. //
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// //
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//----------------------------------------------------------------------------//
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#include "ozz/base/log.h"
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// Provides files abstraction.
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#include "ozz/base/io/stream.h"
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// Provides serialization/deserialization mechanism.
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#include "ozz/base/io/archive.h"
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// Uses the skeleton as an example of object to read.
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#include "ozz/animation/runtime/skeleton.h"
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#include <cstdlib>
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// Code for ozz-animation HowTo: "How to load an object from a file?"
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int main(int argc, char const* argv[]) {
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(void)argc;
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(void)argv;
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// First check that an argument was provided. We expect it to be a valid
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// filename.
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if (argc != 2) {
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ozz::log::Err() << "Invalid arguments." << std::endl;
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return EXIT_FAILURE;
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}
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// Stores filename.
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const char* filename = argv[1];
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{
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////////////////////////////////////////////////////////////////////////////
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// The first section opens a file.
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////////////////////////////////////////////////////////////////////////////
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// Now tries to open the file, which was provided as argument.
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// A file in ozz is a ozz::io::File, which implements ozz::io::Stream
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// interface and complies with std FILE specifications.
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// ozz::io::File follows RAII programming idiom, which ensures that the file
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// will always be closed (by ozz::io::FileStream destructor).
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ozz::io::File file(filename, "rb");
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// Checks file status, which can be closed if filename is invalid.
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if (!file.opened()) {
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ozz::log::Err() << "Cannot open file " << filename << "." << std::endl;
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return EXIT_FAILURE;
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}
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////////////////////////////////////////////////////////////////////////////
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// The next section deserializes an object from the file.
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////////////////////////////////////////////////////////////////////////////
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// Now the file is opened. we can actually read from it. This uses ozz
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// archive mechanism.
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// The first step is to instantiate an read-capable (ozz::io::IArchive)
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// archive object, in opposition to write-capable (ozz::io::OArchive)
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// archives.
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// Archives take as argument stream objects, which must be valid and opened.
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ozz::io::IArchive archive(&file);
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// Before actually reading the object from the file, we need to test that
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// the archive (at current seek position) contains the object type we
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// expect.
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// Archives uses a tagging system that allows to mark and detect thetype of
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// the next object to deserialize. Here we expect a skeleton, so we test for
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// a skeleton tag.
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// Tagging is not mandatory for all object types. It's usually only used for
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// high level object types (skeletons, animations...), but not low level
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// ones (math objects, native types...).
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if (!archive.TestTag<ozz::animation::Skeleton>()) {
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ozz::log::Err() << "Archive doesn't contain the expected object type."
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<< std::endl;
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return EXIT_FAILURE;
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}
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// Now the tag has been validated, the object can be read.
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// IArchive uses >> operator to read from the archive to the object.
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// Only objects that implement archive specifications can be used there,
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// along with all native types. Note that pointers aren't supported.
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ozz::animation::Skeleton skeleton;
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archive >> skeleton;
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// Getting out of this scope will destroy "file" object and close the system
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// file.
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}
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return EXIT_SUCCESS;
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}
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