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a3932960b3
Summary: A fairly big refactor of the texturing API with some breaking changes to how textures are defined. Main changes: - There are now 3 types of texture classes: `TexturesUV`, `TexturesAtlas` and `TexturesVertex`. Each class: - has a `sample_textures` function which accepts the `fragments` from rasterization and returns `texels`. This means that the shaders will not need to know the type of the mesh texture which will resolve several issues people were reporting on GitHub. - has a `join_batch` method for joining multiple textures of the same type into a batch Reviewed By: gkioxari Differential Revision: D21067427 fbshipit-source-id: 4b346500a60181e72fdd1b0dd89b5505c7a33926