OCIO 2.x Backwards Compatible BuiltinTransform Baking
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还没有人认领这个 Issue。
评估
- 难度
- 5/5
- 预计耗时
- 一周以上
- 新手友好度
- 35/100
- Issue 类型
- 功能
- 描述清晰度
- 需要澄清
- 活跃度
- 冷清
- 技术栈
- cpp
调研方向
未指定任何文件或测试。首先跟踪 BuiltinTransform 和 FixedFunctionTransform 实例的表示方式以及它们如何写入配置，然后确定哪些变换可以针对请求的较旧 OCIO 版本进行扁平化。完成标准是：精确表示会被扁平化，不支持的情况会报告错误，并且不添加近似处理。
由索引模型根据 Issue 内容生成。
描述
Given the introduction of BuiltinTransforms and FixedFunctionTransforms in the OCIO 2.x library and configs, there is an increasing likelihood that a config author will need to write out a config to support an application or tool that relies on an older version of the library which may not have access to Builtin or FixedFunction transforms the author wants to utilize.
At present a config author (assuming they're using the latest OCIO version for authoring) would need to keep a local list of which features are available for a given version of the OCIO library/config and manually swap the elements that are not supported for the older library/config version they are targeting.
Many of the BuiltinTransforms and a few of the FixedFunctionTransforms are representable with core OCIO Ops, and thus do not fundamentally require the convenience of having the transform built in to the library. In these cases the library its self should be able to support "flattening" a Builtin or FixedFunction transform to a composition of Transforms/Ops that are supported in the requested version, or throw an error if not.
As a first permutation of the feature it should only support flattening of transforms that are perfectly representable via other Transforms/Ops. At a later stage an automatic approximation of more complex transforms could be explored.
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