AD: Various fixes around dynamic dispatch (#2820)

* Add a test for the new diff material system

* Various fixes for AD

- inout primal context params converted to out params,
- added attributed types to list of stored types
- used differentiated primal func type instead of type of differentiated func to avoid tangling with user-code differential types.

---------

Co-authored-by: Lifan Wu <lifanw@nvidia.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/tests/autodiff/material2/MaterialSystem.slang b/tests/autodiff/material2/MaterialSystem.slang
new file mode 100644
index 000000000..5e733fad9
--- /dev/null
+++ b/tests/autodiff/material2/MaterialSystem.slang
@@ -0,0 +1,8 @@
+//TEST_IGNORE_FILE:
+
+__exported import IMaterial;
+
+IMaterial createMaterialClassConformance(int type, float3 value)
+{
+    return createDynamicObject<IMaterial, float3>(type, value);
+}