Chip Davis 750adcaae2 Advertise the VK_EXT_shader_demote_to_helper_invocation extension.
As of macOS Big Sur and iOS/tvOS 14, the `discard_fragment()` function
in MSL is defined to have demote semantics; that is, fragment shader
output is discarded, but the fragment shader thread continues to run as
a helper invocation. This is very useful for Direct3D emulation, since
this is the semantic that HLSL `discard` has.

Signed-off-by: Chip Davis <chip@holochip.com>
2023-06-07 12:48:02 -07:00
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