gltfpack: Implement initial support for XUASTC #1007
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When compiling against latest Basis Universal (2.0+), we can now use XUASTC compression. It supports variable block sizes and a much larger gamut of quality settings from the perspective of the resulting file size, using DCT to compress the block data with arith/Zstd on top. This format is currently not supported by any glTF extensions; as such, this might need refinements if this happens. For now, the block size is fixed at 4x4; this could be controlled via quality settings or a separate future command line argument. The quality curve for now is somewhat approximate and based on the target size; the quality impact has not been analyzed yet.
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Per a recent update to Basis readme:
I'll keep this PR open for now; would assume a later Basis library version would be required plus a new extension. |
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When compiling against latest Basis Universal (2.0+), we can now use XUASTC compression. It supports variable block sizes and a much larger gamut of quality settings from the perspective of the resulting file size, using DCT to compress the block data with arith/Zstd on top.
This format is currently not supported by any glTF extensions; as such, this might need refinements if this happens. For now, the block size is fixed at 4x4; this could be controlled via quality settings or a separate future command line argument.
The quality curve for now is somewhat approximate and based on the target size; the quality impact has not been analyzed yet.