From 2d604425277f56c98a5c8351914178480f68bc23 Mon Sep 17 00:00:00 2001
From: 3gg <3gg@shellblade.net>
Date: Fri, 6 Mar 2026 13:30:21 -0800
Subject: Move contrib libraries to contrib repo

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 contrib/cgltf-tangents/README.md | 42 ----------------------------------------
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-# cgltf-tangents
-
-A library to compute missing tangent vectors in glTF models using MikkTSpace.
-
-## Example
-
-```
-// Load the glTF scene and buffers as usual.
-cgltf_result result = cgltf_parse_file(&options, filepath, &data);
-cgltf_load_buffers(&options, data, filepath);
-
-// Compute missing tangents.
-cgltfTangentBuffer* tangent_buffers = 0;
-cgltf_size num_tangent_buffers = 0;
-cgltf_compute_tangents(&options, data, &tangent_buffers, &num_tangent_buffers);
-```
-
-## About
-
-This is a single-header/source library that combines
-[MikkTSpace](https://github.com/mmikk/MikkTSpace) and
-[cgltf](https://github.com/jkuhlmann/cgltf) to compute missing tangent vectors
-for models.
-
-Mesh primitives in glTF may have a normal map but not necessarily tangent
-vectors. An example is the
-[DamagedHelmet](https://github.com/KhronosGroup/glTF-Sample-Models/tree/master/2.0/DamagedHelmet/glTF)
-sample. From the
-[spec](https://registry.khronos.org/glTF/specs/2.0/glTF-2.0.html#meshes):
-
-*"When tangents are not specified, client implementations SHOULD calculate
-tangents using default MikkTSpace algorithms with the specified vertex
-positions, normals, and texture coordinates associated with the normal texture."*
-
-cgltf-tangents takes an input glTF scene and scans it for mesh primitives that
-have a normal map but no tangents. cgltf-tangents then invokes MikkTSpace to
-compute tangents for those mesh primitives and outputs an array of tangent
-buffers. The client can then upload these buffers to GPU memory for rendering.
-
-See `test/` for a complete example.
-
-MikkTSpace is packaged here for convenience. cgltf must be obtained separately.
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