Requires Vulkan 1.0
This extension allows the fragment coverage value, represented as an integer
bitmask, to be substituted for a color output being written to a
single-component color attachment with integer components (e.g.
The functionality provided by this extension is different from simply
SampleMask fragment shader output, in that the coverage
value written to the framebuffer is taken after stencil test and depth test,
as well as after fragment operations such as alpha-to-coverage.
This functionality may be useful for deferred rendering algorithms, where the second pass needs to know which samples belong to which original fragments.
For more information, see the Vulkan Specification
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