Richard Geldreich's Blog
Richg 42 Blog Spot. Co-owner of Binomial LLC, working on GPU texture interchange. Open source developer, graphics programmer, former video game...
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Best pages on Richg42.blogspot.com
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Co-owner of Binomial LLC, working on GPU texture interchange. Open source developer, graphics programmer, former video game developer. Worked previously at SpaceX (Starlink), Valve, Ensemble Studios (...
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Richard Geldreich's Blog: zlib in serious danger of becoming obsolete
Intro I’m now starting to deeply analyze the performance of two new general purpose data compression codecs. One is Google’s Brotli code...
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Rich Geldreich's Tech And Programmer Culture Blog: State of Linux Gaming
I'm not exactly sure that it "must be even harder with more modern engines". I'd rather say it "must be even harder with more modern PRE-EXISTING engines". Modern OpenGL is about explicit fences, text...
Richg42.blogspot.com news digest
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2 years
Turns out PNG is very amendable to RDO optimization approaches, but few have really tried.
This is something I've been wanting to try for a while. This experiment only injects 3 pixel matches into the PNG Paeth (#4) predictor bytes. It uses an accurate Deflate bitprice model which is computed by first compressing the image to 24bpp PNG using... -
2 years
281-346 megapixels/sec. when using fixed filters:
https://github.com/veluca93/fpnge -
2 years
LZ_XOR 128KB dictionary, AVX2, BMI1, mid-level CPU parsing, Ice Lake CPU (Core i7 1065G7 @ 1.3GHz, Dell Laptop).
Only the XOR bytes are entropy coded, otherwise everything else (the control stream, the usually rare literal runs) are sent byte-wise. It uses 6-bit length limited prefix codes in 16 streams, AVX2 gathers and shuffle-based LUT's. I also have a two gather... -
2 years
One nice property of highly constrained length limited prefix codes
I realized earlier that I don't need AVX2 for really fast Huffman (really length limited prefix) decoding. Using a 6-bit max Huffman code size, a 12-bit decode table (16KB - which fits in the cache) is guaranteed to always give you 2 symbols per lookup...
Domain history
| Web host: | Google LLC |
| Registrar: | MarkMonitor Inc. |
| Registrant: | Google LLC |
| Updated: | June 29, 2023 |
| Expires: | July 31, 2024 |
| Created: | July 31, 2000 |
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