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Once a texture has been loaded as a compressed texture, it can be used for texturing in exactly the same way as an uncompressed texture. The details of the ETC2/EAC formats are beyond our scope here, and most developers will never write their own compressors. Freely available tools for generating ETC images include the open-source libKTX library from Khronos (http:// khronos.org/opengles/sdk/tools/KTX/), the rg_etc project (https://code .google.com/p/rg-etc1/), the ARM Mali Texture Compression Tool, Qualcomm TexCompress (included in the Adreno SDK), and Imagination Technologies PVRTexTool. We would encourage readers to evaluate the available tools and choose the one that fits best with their development environment/platform
原文：http://www.cnblogs.com/time-is-life/p/7456725.html