Support shader parameters that are an array of existential type. (#1542)

* Support shader parameters that are an array of existential type.

* Rename to getFirstNonExistentialValueCategory

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

1 files changed, 48 insertions, 0 deletions

diff --git a/tests/compute/array-existential-parameter.slang b/tests/compute/array-existential-parameter.slang
new file mode 100644
index 000000000..f640ba752
--- /dev/null
+++ b/tests/compute/array-existential-parameter.slang
@@ -0,0 +1,48 @@
+// Test using existential shader parameter that is an interface array.
+
+//TEST(compute):COMPARE_COMPUTE:-cpu
+//DISABLE_TEST(compute):COMPARE_COMPUTE:-cuda
+
+[anyValueSize(8)]
+interface IInterface
+{
+    int run(int input);
+}
+
+//TEST_INPUT:ubuffer(data=[0 0 0 0], stride=4):out,name=gOutputBuffer
+RWStructuredBuffer<int> gOutputBuffer;
+
+struct Params
+{
+    IInterface values[2];
+};
+
+//TEST_INPUT:cbuffer(data=[rtti(MyImpl) witness(MyImpl, IInterface) 1 0], stride=4):name=gCb
+ConstantBuffer<Params> gCb;
+
+//TEST_INPUT:cbuffer(data=[rtti(MyImpl) witness(MyImpl, IInterface) 1 0], stride=4):name=gCb2
+ConstantBuffer<Params> gCb2;
+
+[numthreads(4, 1, 1)]
+void computeMain(uint3       dispatchThreadID : SV_DispatchThreadID)
+{
+    let tid = dispatchThreadID.x;
+
+    let inputVal : int = tid;
+    let outputVal = gCb.values[0].run(inputVal) + gCb2.values[0].run(inputVal);
+
+    gOutputBuffer[tid] = outputVal;
+}
+
+//TEST_INPUT: globalExistentialType MyImpl
+//TEST_INPUT: globalExistentialType __Dynamic
+
+// Type must be marked `public` to ensure it is visible in the generated DLL.
+public struct MyImpl : IInterface
+{
+    int val;
+    int run(int input)
+    {
+        return input + val;
+    }
+};