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RFC: Add APPLE_texture_format_bgra8888 and support for internal format BGRA8_EXT

Gert Wollny requested to merge gerddie/mesa:add_apple_texture_format_BGRA8888 into master

In EXT_texture_storage we have:

Accepted by the <internalformat> parameter of TexStorage* when implemented on OpenGL ES:
 ...
 (if EXT_texture_format_BGRA8888 or APPLE_texture_format_BGRA8888 is supported)
  BGRA8_EXT                      0x93A1
  ...

so make it possible to use this internal format.

Strangely enough EXT_texture_format_BGRA8888 doesn't mention GL_BGRA8_EXT but APPLE_texture_format_BGRA8888 does, so advertise this extension too.

Edited by Gert Wollny

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