refine texture byte size once known#178
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After decoding we know the real texture size in GPU RAM so we may update the cache size to a more precise value.
This is useful for two reasons because 10x inflate over compressed size can be quite a bit lower than the real value for highly compressed images. On the few models I tested it was consistently 50-70% lower than the real size.
For highly textures photogrammetry models that can amount to hundreds of MB of error.