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Defer color packing and scrambling (#385)
This change moves packing and scrambling of quantized colors for the BISE bitstream to the physical layer. The symbolic layer of the codec always deals with colors in linear order in the 0-255 range, with sparse values if quantized. This matches a similar change we made for weights in an earlier release. This improves performance by ~1%, at the expense of an extra set of data tables, although the ROM cost is offset by making one of the other sets of tables in to a table of variable length tables, instead of a regular 2D array.
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Lines changed: 974 additions & 789 deletions

‎Source/astcenc_block_sizes.cpp‎

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@@ -1006,7 +1006,7 @@ static void construct_block_size_descriptor_2d(
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}
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/**
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* @brief Allocate block modes and decimation tables for a single £D block size.
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* @brief Allocate block modes and decimation tables for a single 3D block size.
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*
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* TODO: This function doesn't include all of the heuristics that we use for 2D block sizes such as
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* the percentile mode cutoffs. If 3D becomes more widely used we should look at this.

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