Support stage_switch. (#6311)

* Support stage_switch.

* Update proposal status.

* Fix gl_InstanceID.

* Fix.

1 files changed, 6 insertions, 0 deletions

diff --git a/source/slang/slang-ir.cpp b/source/slang/slang-ir.cpp
index 3314567f1..6cf7a1786 100644
--- a/source/slang/slang-ir.cpp
+++ b/source/slang/slang-ir.cpp
@@ -3209,6 +3209,11 @@ void IRBuilder::setDataType(IRInst* inst, IRType* dataType)
     }
 }
 
+IRInst* IRBuilder::emitGetCurrentStage()
+{
+    return emitIntrinsicInst(getIntType(), kIROp_GetCurrentStage, 0, nullptr);
+}
+
 IRInst* IRBuilder::emitGetValueFromBoundInterface(IRType* type, IRInst* boundInterfaceValue)
 {
     auto inst =
@@ -8301,6 +8306,7 @@ bool IRInst::mightHaveSideEffects(SideEffectAnalysisOptions options)
     case kIROp_ResolveVaryingInputRef:
     case kIROp_GetPerVertexInputArray:
     case kIROp_MetalCastToDepthTexture:
+    case kIROp_GetCurrentStage:
         return false;
 
     case kIROp_ForwardDifferentiate: