You do understand that:
1. AMD does not make the GPU you mentioned ( even though there some history there ).
2. Compressed texture formats on mobile devices are NOT the same as those desktop devices. i.e. OpenGL ES is NOT OpenGL.
Hi, thank you for your reply. However, even though you are technically right that Ardeno is not produced by AMD, the texture compression extension used by it is GL_AMD_compressed_ATC_texture. Reading the spec (https://www.khronos.org/registry/gles/extensions/AMD/AMD_compressed_ATC_texture.txt ), the extension refers to AMD compressonator which however is a legacy product and the link in the spec is broken. The latest compression tools are given in the link in my original post.