KhronosGroup/WebGL — pull request #11 by bjacob (2012-08-07 21:30:49+00:00)
Title:  Add WEBGL_compressed_texture_pvrtc

This adds a new extension proposal: WEBGL_compressed_texture_pvrtc

Note that the formulas for byte lengths look different from the ones in the upstream GLES extension,
http://www.khronos.org/registry/gles/extensions/IMG/IMG_texture_compression_pvrtc.txt

They are in fact equivalent to them, just simplified. The idea is that with these formats, width and heights must be powers of two.