From f0ba756c2f982aac8095ff0928d048fc97548315 Mon Sep 17 00:00:00 2001
From: ArielG-NV <159081215+ArielG-NV@users.noreply.github.com>
Date: Mon, 26 Aug 2024 19:07:10 -0400
Subject: Fix Varying Variable Location Assignments With Hull Shaders (#4915)

* Fix Varying Variable Location Assignments With Hull Shaders

Fixes: #4913
Fixes: #4540

Changes:
1. Added `kIROp_ControlBarrier` to HLSL/GLSL emitting.
2. Added a method to track 'used' and 'unused' varyings for when legalizing GLSL. This allows us to assign correct offsets to automatically added varyings
    * Added a `ZeroLSB` check to UIntSet for this purpose

* add missing return

* code comment adjustment

* cleanup

* comment and HLSL controlBarrier mistake

* assume space for glsl/spriv varying is irrelevant
---
 source/slang/slang-emit-hlsl.cpp | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'source/slang/slang-emit-hlsl.cpp')

diff --git a/source/slang/slang-emit-hlsl.cpp b/source/slang/slang-emit-hlsl.cpp
index d3757f534..a867d4c06 100644
--- a/source/slang/slang-emit-hlsl.cpp
+++ b/source/slang/slang-emit-hlsl.cpp
@@ -500,6 +500,11 @@ bool HLSLSourceEmitter::tryEmitInstExprImpl(IRInst* inst, const EmitOpInfo& inOu
 {
     switch (inst->getOp())
     {
+        case kIROp_ControlBarrier:
+        {
+            m_writer->emit("GroupMemoryBatrierWithGroupSync();\n");
+            return true;
+        }
         case kIROp_MakeVector:
         case kIROp_MakeMatrix:
         {
-- 
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