tree df1203d3bde76e53871b8a50caf0b8ad4c2d5c34
parent 2e6c4dc5c590d9cb45d2d772aeee45a057a47ef1
author Alexis Hetu <sugoi@google.com> 1648056720 -0400
committer Alexis Hétu <sugoi@google.com> 1648227208 +0000

VK_KHR_shader_terminate_invocation implementation

This extension adds Vulkan support for the
SPV_KHR_terminate_invocation SPIR-V extension. That SPIR-V
extension provides a new instruction, OpTerminateInvocation,
which causes a shader invocation to immediately terminate
and sets the coverage of shaded samples to 0; only
previously executed instructions will have observable
effects. The OpTerminateInvocation instruction, along with
the OpDemoteToHelperInvocation instruction from the
VK_EXT_shader_demote_to_helper_invocation extension,
together replace the OpKill instruction, which could behave
like either of these instructions. OpTerminateInvocation
provides the behavior required by the GLSL discard statement,
and should be used when available by GLSL compilers and
applications that need the GLSL discard behavior.

Tests: dEQP-VK.rasterization.frag_side_effects.*.terminate_invocation
Tests: dEQP-VK.renderpass.depth_stencil_write_conditions.*terminate*
Bug: b/204499870
Change-Id: I3756f109a5aab15a05bb1f028944408ec30c95fa
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/64448
Kokoro-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Alexis Hétu <sugoi@google.com>