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Thread: Oodle Texture compression

  1. #1
    Member SolidComp's Avatar
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    Oodle Texture compression

    Charles Bloom posted about Oodle's new texture compression last week. It looks interesting. Did someone say that Oodle compression was used in the upcoming Sony PS5? I thought I saw something about its disk IO being crazy fast, and I wonder if the compression was part of the reason why.

    A big part of the Oodle Texture story seems to be Rate Distortion Optimization (RDO):

    For distortion, you could easily just measure the squared distance error of the encoding (aka RMSE, SSD or PSNR), but that's not actually what we care about. We care about the visual quality of the block, and the human eye does not work like RMSE, it sees some errors as objectionable even when they are quite numerically small. For RDO BCN we need to be able to evaluate distortion millions of times on the possible encodings, so complex human-visual simulations are not possible. We use a very simple approximation that treats errors as more significant when they occur in smooth or flat areas, because those will be more jarring to the viewer; errors that occur in areas that were already noisy or detailed will not be as noticeable, so they get a lower D score. Getting this right has huge consequences, without a perceptual distortion measure the RDO can produce ugly visible blocking artifacts even when RMSE is quite low.
    This randomly reminds me that I don't know why we don't use GPU texture formats as our mainstream image formats, since they compress a lot better. (By the way, JPEG-XL looks a lot like Bloom's description of the ideal JPEG successor from a couple of years ago.)

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    Hardware-based compression

    Compression is a huge part of the PlayStation 5's data management. The console will have a powerful new compression system that essentially shrinks data and reduces the overall install size of data on your SSD. So not only will games have less redundant assets, they can be smaller, too.

    Like the Xbox Series X, the PlayStation 5 will have its own hardware-based compression block that's situated on the 7nm SoC.

    Basically this means a section on the console's main chip will be dedicated to decompressing data. This will help the CPU in decompressing the compressed data from downloads, installs, and discs.

    Decompression is very taxing on a CPU and causes lots of overhead, so this will free up the CPU to other in-game tasks like higher frame rates.

    The PS5 uses a derivative of RAD Tool's potent Kraken decompression technology, which offers 10% better compression--that's about 10% more installations or data on a Blu-ray disc. Without the dedicated decompressor, it would take 9 Zen 2 CPU cores to decompress Kraken-level data.

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    Somehow I missed Charles' article about the Kraken compression: cbloom rants: How Oodle Kraken and Oodle Texture supercharge the IO system of the Sony PS5

    Click image for larger version. 

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    Edit: This blog posting was even cited in wccftech's article in the other recent Oodle related thread.

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