From ARB_post_depth_coverage:
"This extension allows the fragment shader to control whether values in
gl_SampleMaskIn[] reflect the coverage after application of the early
depth and stencil tests. This feature can be enabled with the following
layout qualifier in the fragment shader:
layout(post_depth_coverage) in;
Use of this feature implicitly enables early fragment tests."
And a bit later it also adds:
"early_fragment_tests" requests that fragment tests be performed before
fragment shader execution, as described in section 15.2.4 "Early Fragment
Tests" of the OpenGL Specification. If neither this nor post_depth_coverage
are declared, per-fragment tests will be performed after fragment shader
execution."
Fixes:
GL45-CTS.post_depth_coverage_tests.PostDepthSampleMask
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Iago Toral Quiroga
42b9057447