astc-encoder
fpng
astc-encoder | fpng | |
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1 | 10 | |
981 | 830 | |
3.0% | - | |
8.0 | 4.1 | |
4 days ago | 5 months ago | |
C | C | |
Apache License 2.0 | - |
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astc-encoder
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Doubts about _CameraDepthTexture
A1: The optimization suggestion in the original text is to remove the meaningless Alpha channel (defined in the original text that the Alpha channel has the value of 1). This is indeed helpful for memory optimization. In your test case, whether it is in png or tga format, after entering the engine, it will be converted to the internal format (RGBA, ETC, ASTC, etc.) by the engine. Imagine taking ETC2 as an example. If there is no Alpha channel and the compression quality is acceptable, RGB_Compressed_ETC2_4bits can be used. If this meaningless Alpha channel is added, then we will automatically select RGBA_Compressed_ETC2_8bits when importing the settings in batches. In this way, the memory is doubled. Regarding the ASTC in the question, the definition of the Texture import format (https://github.com/Unity-Technologies/UnityCsReference/blob/master/Editor/Mono/AssetPipeline/TextureImporterEnums.cs) in the Unity editor source code has this comment: // ASTC uses 128bit block of varying sizes (we use only square blocks). It does not distinguish RGB/RGBA. That is, it has nothing to do with whether the Alpha channel is included. For an introduction to the ASTC format, I recommend you to read the ASTC Format Overview on Github: https://github.com/ARM-software/astc-encoder/blob/main/Docs/FormatOverview.md Regarding the issue of the new version of Unity mentioned in your previous reply, you can look at this issue on the Unity forum: https://forum.unity.com/threads/is-astc-rgb-encode-gone.660622 Some people may think that if the format of all textures in the project is ASTC, the meaning of removing Alpha is not very significant. In fact, it cannot be generalized. Although the size is the same, according to the test in (https://zhuanlan.zhihu.com/p/158740249), Whether there is an Alpha channel will affect the compression quality to a certain extent. Therefore, it must be used reasonably in the project.
fpng
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png crate gets an ultrafast compression mode, up to 4x faster decompression
When the QOI format was first announced it wasn't clear that was even possible while keeping PNG format compatibility. But the fpng and fpnge C/C++ libraries showed it was, and today you can take advantage of those advances in a general purpose PNG library in Rust!
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Hello, PNG
CRC is a table and 5 lines of code. That's trivial.
>zlib is 23k lines
It's not needed to make a PNG reader/writer. zlib is massive overkill for only making a PNG reader or writer. Here's a tiny deflate/inflate code [2] under 1k lines (and could be much smaller if needed).
stb[0] has single headers of ~7k lines total including all of the formats PNG, JPG, BMP,. PSD, GIF, HDR, and PIC. Here's [1] a 3k lines single file PNG version with tons if #ifdefs for all sorts of platforms. Removing those and I'd not be surprised if you could not do it in ~1k lines (which I'd consider quite simple compared to most of todays' media formats).
>Of course they're not common formats so you're stuck with complex formats like PNG
BMP is super common and easy to use anywhere.
I use flat image files all the time for quick and dirty stuff. They quickly saturate disk speeds and networking speeds (say recording a few decent speed cameras), and I've found PNG compression to alleviate those saturate CPU speeds (some libs are super slow, some are vastly faster). I've many times made custom compression formats to balance these for high performance tools when neither things like BMPs or things like PNG would suffice.
[0] https://github.com/nothings/stb
[1] https://github.com/richgel999/fpng/blob/main/src/fpng.cpp
[2] https://github.com/jibsen/tinf/tree/master/src
- Quite OK Image is now my favorite asset format
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Computing Adler32 Checksums at 41 GB/s
This was actually considered, and other libraries do ignore checksums, or at least have options to:
https://github.com/richgel999/fpng/issues/9
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QOI – The Quite OK Image Format
In the other direction, you can target a subset of PNG to get less optimized images but with QOI-like encode and decode speed: https://github.com/richgel999/fpng
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ReShade 5.0 Released!
On specific operations like screenshots for example the new version is WAY faster though. We were using stb_image_write.h but switched to fpng which promised 12-19x faster compression at smaller sizes. That and the fact that screenshot saving have now been given it's own thread so it now longer causes a small stutter like when it was on the main thread, means that screenshot are now near instantaneous.
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QOI – The “Quite OK Image Format” for fast, lossless image compression
I think QOI inspired the creation of https://github.com/richgel999/fpng which creates standard PNGs and compares itself directly to QOI.
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Losslessly compresses RGB and RGBA images to a similar size of PNG, while offering a 20x-50x speedup in compression and 3x-4x speedup in decompression
BTW, today I found this fpng-fast PNG writer. There is a comparison with QOI in the readme.
What are some alternatives?
compressonator - Tool suite for Texture and 3D Model Compression, Optimization and Analysis using CPUs, GPUs and APUs
qoi - The “Quite OK Image Format” for fast, lossless image compression
UnityCsReference - Unity C# reference source code.
fpnge - Demo of a fast PNG encoder.
j40 - J40: Independent, self-contained JPEG XL decoder
libdeflate - Heavily optimized library for DEFLATE/zlib/gzip compression and decompression
icer_compression - Progressive, error tolerant, wavelet-based image compression algorithm
oss-nvjpg - Hardware-accelerated JPEG decoding on the Nvidia Tegra X1
PNG-spec - Maintenance of the PNG specification
php-qoi - QOI image encoder and decoder written in pure PHP
libpng - LIBPNG: Portable Network Graphics support, official libpng repository
Turbo-Range-Coder - TurboRC - Fastest Range Coder + Arithmetic Coding / Fastest Asymmetric Numeral Systems