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i965: support GL_EXT_color_buffer_half_float

Ilia Mirkin requested to merge imirkin/mesa:i965-es-fp16 into master

FP16 rendering is supported on all gen4+ hardware.

Signed-off-by: Ilia Mirkin imirkin@alum.mit.edu

Closes #4358 (closed)

I ran this change in the intel CI: https://mesa-ci.01.org/imirkin/builds/35/group/d130720361ceb5bdf030b3bee2b706d1

It should have enabled a bunch of tests, but I think those were previous marked as "pass" even though they were "not supported" in practice. I don't have the hardware handy to verify this by hand. This extension should be covered by dEQP-GLES3 tests though (and perhaps in other test suites). Perhaps it can be read out from direct access to the Intel CI system.

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