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Update basis_spec.txt

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Rich Geldreich
2020-05-26 00:17:00 -04:00
committed by GitHub
parent 053785bb67
commit 576844fd69
1 changed files with 3 additions and 2 deletions
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spec/basis_spec.txt
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@@ -386,7 +386,7 @@ The second bit of this section indicates if "hybrid" global/local selector
codebooks are used. Hybrid codebooks are not supported either, so this bit
should always be 0.
The third bit indicates of the selector codebook has been sent in raw form
The third bit indicates if the selector codebook has been sent in raw form
(uncompressed). If it's set, each selector is sent as four 8-bit bytes. Each
byte corresponds to four 2-bit ETC1S selectors. The first selector of each group
of 4 selectors starts at the LSB (least significant bit) of each byte, and is
@@ -396,7 +396,8 @@ If the third bit is 0, the selectors have been DPCM coded with Huffman coding.
The "delta_selector_pal_model" Huffman table will immediately follow the third
bit, and is stored using the procedure outlined in section 6.0.
Here is the DPCM decoding procedure for selector codebooks:
Immediately following the Huffman table is the compressed selector codebook.
Here is the DPCM decoding procedure:
uint8_t prev_bytes[4] = { 0, 0, 0, 0 };