sv_groupindex support for spirv (#3060)

2 files changed, 8 insertions, 0 deletions

diff --git a/source/slang/slang-emit-spirv.cpp b/source/slang/slang-emit-spirv.cpp
index 7352cd859..f63d2e417 100644
--- a/source/slang/slang-emit-spirv.cpp
+++ b/source/slang/slang-emit-spirv.cpp
@@ -2051,6 +2051,10 @@ struct SPIRVEmitContext
                 {
                     return getBuiltinGlobalVar(inst->getFullType(), SpvBuiltInGlobalInvocationId);
                 }
+                else if (semanticName == "sv_groupindex")
+                {
+                    return getBuiltinGlobalVar(inst->getFullType(), SpvBuiltInLocalInvocationIndex);
+                }
             }
         }
         return nullptr;
diff --git a/source/slang/slang-ir-spirv-legalize.cpp b/source/slang/slang-ir-spirv-legalize.cpp
index b0199a760..a0183d93f 100644
--- a/source/slang/slang-ir-spirv-legalize.cpp
+++ b/source/slang/slang-ir-spirv-legalize.cpp
@@ -67,6 +67,10 @@ struct SPIRVLegalizationContext : public SourceEmitterBase
                     {
                         storageClass = SpvStorageClassInput;
                     }
+                    else if (semanticName == "sv_groupindex")
+                    {
+                        storageClass = SpvStorageClassInput;
+                    }
                 }
             }
             // Make a pointer type of storageClass.