2D Bit Rates. 3D Bit Rates. 4×4 bpp 10×5 bpp 3x3x3 bpp 5x5x4 bpp. 5×4 bpp 10×6 bpp 4x3x3 bpp 5x5x5 bpp. 5×5 . Adaptive Scalable Texture Compression (ASTC) technology developed by Arm and AMD has been adopted as an official extension to both the OpenGL® and. Adaptative Scalable Texture Compression (ASTC) is a new texture com- pression format which is set to take the world by storm. Having been accepted as a new.

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With RGTC, for example, the image format you use specifies the number of channels returned. Did you find this page useful?

Technologies | Adaptive Scalable Texture Compression (ASTC) – Arm Developer

This is the default compression for Textures that have an alpha channel. How can we deal with these topics? You’ve told us this page has a problem. However, on most platforms there are a number of different supported Texture compression formats to choose from.

Texture compression formats for platform-specific overrides

Thus, this extension provides a large suite of formats, with the only variance being colorspace and block size. The net result being ASTC handles most types of fexture. The objective of texture compression is to reduce data size, while minimizing impact on visual quality. Again, this is handled on a per-block basis, rather than as an assumption of the format.

However, it had issues that hampered its widespread adoption: Retrieved from ” https: You can help the OpenGL Wiki by expanding it. Important Information for the Arm website. This delivers better image quality than previous formats, ocmpression at higher compression. OpenGL 4, Linux Note: Crunch compression helps the Texture use the lowest possible amount of space on disk and for downloads.


This makes it easy for hardware to tell what has to be decompressed to get at a specific texel, which is a frequent operation in texture accessing.

Adaptive Scalable Texture Compression – Wikipedia

The available bit rates thus range from 4. This is especially the case if previously you have avoided using DXT on specific assets; you might now try ASTC formats vs leaving the assets uncompressed. If you know how to fix it, or have something better we could use instead, please let us know: Experiment with increased compression when time permits.

Please tell us more about what’s missing: In the description below, see the final file size of a in-game Texture of by pixels The smallest unit in a tetxure image. ASTC specification includes two profiles: When this happens, time is lost decompressing Textures, and memory is lost because you are storing them twice. The biggest issue with ETC2 are complaints about its extremely slow compression tools.

Over the next few months we will be adding more developer resources and documentation for all the products and technologies that ARM provides. The alternative formats generally offer 4bpp for RGB or single channel data, some can fit alpha in that footprint, some offer ashc quality alpha or a second single channel data block in a second 4bpp section.

By default, the Unity Editor automatically converts Textures to the most appropriate format to match the build target you have selected. Reducing File Size Further File size is critical with modern content that can be a gigabyte or more in size.


Adaptive Scalable Texture Compression

It might be a Known Issue. Compression Tools The following is a brief selection of tools available on the internet to help developers deal with texture compression.

Crunch compression is a lossy compression format meaning that parts of the data are lost during compression on top of DXT or ETC Texture compression. Batch compress a small set of test assets maybe one or two dozen files and look for where quality starts to drop below the required bar for the product. From Wikipedia, the free encyclopedia.

So this is a new wrinkle to factor in: By contrast, in DXT3 or 5, you would be wasting most of the bits reserved for the alpha block. Correlating channels makes the data smaller, but it also means that there can be a comptession of bias, where a particular gradient in a block provides more accuracy to one channel than another. They are able to be used with all other textures, including 1D Array Textures. An Approach to Compressing Assets For your product, you need to decide overall, as well as per asset, whether quality vs the raw asset or shrinking the file size is most important.