From: Chia-I Wu <o...@lunarg.com>

Hi,

This series add GL_OES_compressed_ETC1_RGB8_texture support for softpipe and
llvmpipe.  GL_OES_compressed_ETC1_RGB8_texture is a GLES-specific extension.
It defines a new compressed texture format, GL_ETC1_RGB8_OES.  This format is
probably the only commonly used format on GLES that is supported by multiple
vendors.

Other than not prefixed by GL_COMPRESSED_, the other difference from other
compressed formats is that the format is only valid for
glCompressedTexImage2D:  No update (gl*TexSubImage2D) nor compression
(gl[Copy]TexImage) is allowed.  This difference can actually be seen with most
GLES compressed formats.
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