spine-c

The spine-c runtime provides basic functionality to load and manipulate Spine skeletal animation data using ANSI C89. It does not perform rendering but can be extended to enable Spine animations for other C-based projects, including C++ or Objective-C projects.

Licensing

You are welcome to evaluate the Spine Runtimes and the examples we provide in this repository free of charge.

You can integrate the Spine Runtimes into your software free of charge, but users of your software must have their own Spine license. Please make your users aware of this requirement! This option is often chosen by those making development tools, such as an SDK, game toolkit, or software library.

In order to distribute your software containing the Spine Runtimes to others that don't have a Spine license, you need a Spine license at the time of integration. Then you can distribute your software containing the Spine Runtimes however you like, provided others don't modify it or use it to create new software. If others want to do that, they'll need their own Spine license.

For the official legal terms governing the Spine Runtimes, please read the Spine Runtimes License Agreement and Section 2 of the Spine Editor License Agreement.

Spine version

spine-c works with data exported from Spine 4.2.xx.

spine-c supports all Spine features.

Setup

1. Download the Spine Runtimes source using git or by downloading it as a zip via the download button above.
2. Copy the contents of the spine-c/spine-c/src and spine-c/spine-c/include directories into your project. Be sure your header search is configured to find the contents of the spine-c/spine-c/include directory. Note that the includes use spine/Xxx.h, so the spine directory cannot be omitted when copying the files.

If SPINE_SHORT_NAMES is defined, the sp prefix for all structs and functions is optional. Only use this if the spine-c names won't cause a conflict.

Usage

Please see the spine-c guide for full documentation

Extension

Extending spine-c requires implementing three methods:

• _spAtlasPage_createTexture Loads a texture and stores it and its size in the void* rendererObject, width and height fields of an spAtlasPage struct.
• _spAtlasPage_disposeTexture Disposes of a texture loaded with _spAtlasPage_createTexture.
• _spUtil_readFile Reads a file. If this doesn't need to be customized, _readFile is provided which reads a file using fopen.

With these implemented, the spine-c API can then be used to load Spine animation data. Rendering is done by enumerating the slots for a skeleton and rendering the attachment for each slot. Each attachment has a rendererObject field that is set when the attachment is loaded.

For example, AtlasAttachmentLoader is typically used to load attachments when using a Spine texture atlas. When AtlasAttachmentLoader loads a RegionAttachment, the attachment's void* rendererObject is set to an AtlasRegion. Rendering code can then obtain the AtlasRegion from the attachment, get the AtlasPage it belongs to, and get the page's void* rendererObject. This is the renderer specific texture object set by _spAtlasPage_createTexture. Attachment loading can be customized if not using AtlasAttachmentLoader or to provider different renderer specific data.

spine-sfml serves as a simple example of extending spine-c.

spine-c uses an OOP style of programming where each "class" is made up of a struct and a number of functions prefixed with the struct name. More detals about how this works are available in extension.h. This mechanism allows you to provide your own implementations for spAttachmentLoader, spAttachment and spTimeline, if necessary.

Runtimes extending spine-c

• spine-cocos2d-objc
• spine-sfml