Handle partial existential parameter type specialization. (#1568)

* Specialize exsitentials parameters in struct fields.

* Cleanup.

* Handle partial existential parameter type specialization.

Co-authored-by: Yong He <yhe@nvidia.com>

1 files changed, 46 insertions, 0 deletions

diff --git a/tests/compute/interface-param-partial-specialize.slang b/tests/compute/interface-param-partial-specialize.slang
new file mode 100644
index 000000000..e856e04e8
--- /dev/null
+++ b/tests/compute/interface-param-partial-specialize.slang
@@ -0,0 +1,46 @@
+// Tests generating dynamic dispatch code for a function
+// with existential-struct-typed param by specializing it
+// with __Dynamic. This verifies that the handling of
+// "partially" specializing an existential type is correct.
+
+//TEST(compute):COMPARE_COMPUTE_EX:-slang -compute -cuda
+//TEST(compute):COMPARE_COMPUTE_EX:-slang -compute -cpu
+
+[anyValueSize(8)]
+interface IInterface
+{
+    uint eval();
+}
+
+public struct Impl : IInterface
+{
+    uint val;
+    uint eval()
+    {
+        return val;
+    }
+};
+
+struct Params
+{
+    StructuredBuffer<IInterface> obj;
+};
+
+//TEST_INPUT:ubuffer(data=[0 0 0 0], stride=4):out,name=gOutputBuffer
+RWStructuredBuffer<uint> gOutputBuffer;
+
+void compute(uint tid, Params p)
+{
+    gOutputBuffer[tid] = p.obj[0].eval();
+}
+
+//TEST_INPUT: entryPointExistentialType __Dynamic
+
+[numthreads(4, 1, 1)]
+void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID,
+//TEST_INPUT:ubuffer(data=[rtti(Impl) witness(Impl, IInterface) 1 0], stride=4):name=params.obj
+    uniform Params params)
+{
+	uint tid = dispatchThreadID.x;
+	compute(tid, params);
+}
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