2 files changed, 6 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_tgsi.h b/src/gallium/auxiliary/gallivm/lp_bld_tgsi.h
index 3f76b79b8d1..967373ccdae 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_tgsi.h
+++ b/src/gallium/auxiliary/gallivm/lp_bld_tgsi.h
@@ -165,6 +165,7 @@ struct lp_bld_tgsi_system_values {
    LLVMValueRef vertex_id_nobase;
    LLVMValueRef prim_id;
    LLVMValueRef basevertex;
+   LLVMValueRef invocation_id;
 };
 
 
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c b/src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c
index 092bd18b361..268379e7d13 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c
@@ -1532,6 +1532,11 @@ emit_fetch_system_value(
       atype = TGSI_TYPE_UNSIGNED;
       break;
 
+   case TGSI_SEMANTIC_INVOCATIONID:
+      res = lp_build_broadcast_scalar(&bld_base->uint_bld, bld->system_values.invocation_id);
+      atype = TGSI_TYPE_UNSIGNED;
+      break;
+
    default:
       assert(!"unexpected semantic in emit_fetch_system_value");
       res = bld_base->base.zero;