Add option to preserve shader parameter declaration in output SPIRV. (#4344)

* Add option to preserve shader parameter declarations in output.

* Add test.

1 files changed, 19 insertions, 0 deletions

diff --git a/tests/spirv/preserve-param.slang b/tests/spirv/preserve-param.slang
new file mode 100644
index 000000000..e9cc82291
--- /dev/null
+++ b/tests/spirv/preserve-param.slang
@@ -0,0 +1,19 @@
+//TEST:SIMPLE(filecheck=CHECK): -target spirv -preserve-params -O0
+
+// Test that -preserve-params option preserves shader paraemter declarations in the output spirv code.
+
+// CHECK-DAG: OpDecorate %{{.*}} Binding 0
+
+// CHECK-DAG: OpDecorate %{{.*}} Binding 1
+
+RWStructuredBuffer<float> buffer;
+
+struct TT
+{
+    Texture2D tex;    
+}
+[numthreads(1, 1, 1)]
+void f(ConstantBuffer<TT> t)
+{
+    return;
+}
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