These formats will be eventually be useful for color managed clients
using wl_shm that wish to submit buffers encoding high dynamic range
images.
While the minimum requirement for linearly filterable half float
textures is GL ES 2.0 + GL_OES_texture_half_float_linear, to keep
the code simple, this commit only enables the new formats when
the requirements for color management (notably including GL ES 3.0
and GL_EXT_color_buffer_half_float) are available.
Signed-off-by: Manuel Stoeckl <code@mstoeckl.com>
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