ASTC Texture Sampling with Deblocking in a Simple Pixel Shader

Deblocking is a standard feature in modern image/video codecs, and now developers can benefit from deblocking on GPU textures, either while transcoding to other formats like BC7, or while sampling ASTC textures directly.

This demo with source code shows how to sample ASTC textures (or really any GPU texture format, of any block size) with deblocking applied in a simple pixel shader. It's intended for the larger ASTC block sizes, i.e. beyond 6x6. It greatly reduces block artifacts, which allows larger block sizes to be used across a wider range of content, which ultimately lowers bitrates, memory bandwidth, and download sizes.

https://github.com/BinomialLLC/basis_universal/tree/master/shader_deblocking

This is a form of "GPU texture compression-aware shading" or "GPU format-informed reconstruction".