Gltf
Process-level registry of pluggable codecs the glTF parser consults when it encounters compressed payloads. Apps wire concrete implementations once at startup (typically in their entry-point's first lines); GltfReader reads the registry on the streaming hot path without per-call plumbing.
Process-level (vs. per-layer): every codec here is a stateless byte-to-array transform. Having two consumers in the same app use different Draco / KTX2 decoders has no legitimate use case, and a global registry avoids constructor-arg churn.
Thread-safety: fields are @Volatile for visibility but writes should happen during startup, before any glTF parse begins. Hot-swapping mid-run is undefined for assets already mid-decode.
Codec implementations ship as separate sibling modules:
worldwind-formats-gltf-draco—DracoDecoderbacked by libdracoworldwind-formats-gltf-ktx2—Ktx2Decoderbacked by libktx (Basis Universal)worldwind-formats-gltf-meshopt—MeshoptDecoderbacked by meshoptimizer
Properties
Decoder for the KHR_draco_mesh_compression glTF extension. Null = unsupported; Draco-compressed primitives log once + skip.
Decoder for the KHR_texture_basisu glTF extension (KTX2 / Basis Universal compressed textures). Null = unsupported; KTX2 texture references log once + the texture is omitted, leaving the affected primitive untextured.
Decoder for the EXT_meshopt_compression glTF extension (meshoptimizer-compressed bufferViews). Null = unsupported; meshopt-compressed bufferViews log once + are skipped, leaving affected primitives without those attributes (typically renders the primitive as missing or with default values for the affected components).