- Most of the fixes are about unhandled enums.
- Adding an unbindBuffer method to GLEScontext, and use it in the
glDeleteBuffers call, so a buffer is not considered bound after
it has been deleted.
- Handle the case where a call to glCompressedTexImage2D gets
NULL as its data (in which case the uncompressTexture function
should only calculate the output format, but not attempt to
uncompress the NULL data).
- A few segfaults.
Change-Id: I6a856ea6da1be3b15b41140d6383508a6803897c
3150361b51