astcrt

This repository contains the code written for my thesis: Real-Time Adaptive Scalable Texture Compression for the Web[1]. It contains the program astcrt, which compress input images into ASTC[2] files.

Building

To build run ./build/configure && ninja -C out_clang_debug.

Dependencies:

• Bash
• Ninja
• Clang (for debug builds)
• GCC (for release builds)
• GCC with ARM cross compiler (for arm builds)

Running

The astcrt program encodes an TGA file using the ASTC format. The program takes two arguments: input TGA file path and output ASTC file path. The TGA file must be uncompressed 32-bit BGRA without a color map. The width and height of the input file must also be a multiple of 4. Prepare the image with an image manipulation program.

Decoding

The reference implementation by ARM[3] can be used for decoding.

Run it with the following commands:

astcrt original.tga encoded.astc
astcenc -d encoded.astc decoded.tga
astcenc -compare original.tga decode.tga -showpsnr

References

1. Real-Time Adaptive Scalable Texture Compression for the Web
2. Adaptive Scalable Texture Compression
3. Reference Encoder