Fix segmentation fault in ray tracing parameter consolidation. (#7997)

* Initial plan

* Fix segfault in ray tracing parameter consolidation

Co-authored-by: csyonghe <2652293+csyonghe@users.noreply.github.com>

* Fix.

* Fix.

* Keep entrypoint param layout consistent during `MoveEntryPointUniformParametersToGlobalScope`.

* Fix.

* fix.

* Fix.

* Fix pending layout handling.

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: csyonghe <2652293+csyonghe@users.noreply.github.com>
Co-authored-by: Yong He <yonghe@outlook.com>

1 files changed, 43 insertions, 0 deletions

diff --git a/tests/pipeline/ray-tracing/ray-tracing-paramblock-regression.slang b/tests/pipeline/ray-tracing/ray-tracing-paramblock-regression.slang
new file mode 100644
index 000000000..657618ce3
--- /dev/null
+++ b/tests/pipeline/ray-tracing/ray-tracing-paramblock-regression.slang
@@ -0,0 +1,43 @@
+// ray-tracing-paramblock-regression.slang
+
+// Regression test for fix to segfault when using ParameterBlock with generics
+// in ray tracing shaders
+
+//TEST:SIMPLE(filecheck=CHECK): -target spirv
+
+interface IMatData {}
+
+struct PerDrawSubmesh<T> where T : IMatData
+{
+    T* p_mat_data;
+}
+
+struct RtUbo<T> where T : IMatData
+{
+    PerDrawSubmesh<T>* p_per_dsm_buff;
+}
+
+struct RtPayload
+{
+    float3 emission = float3(0);
+}
+
+struct RtParams<T> where T : IMatData
+{
+    RtUbo<T> ubo;
+};
+
+struct MatData : IMatData
+{
+    float4 emission;
+}
+
+// This used to cause a segfault before the fix
+[shader("closesthit")]
+void chit_main_with_paramblock(uniform ParameterBlock<RtParams<MatData>> params, in BuiltInTriangleIntersectionAttributes attr, out RtPayload payload)
+{
+    payload = {};
+    payload.emission = float3(1, 0, 0);
+}
+
+// CHECK: OpEntryPoint
\ No newline at end of file