Various slangpy fixes. (#3227)

* Make dynamic cast transparent through `IRAttributedType`.

* Add [CUDAXxx] variant of attributes.

* Support marshaling of vector types.

* Wrap cuda kernels in `extern "C"` block.

---------

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

1 files changed, 35 insertions, 0 deletions

diff --git a/tests/autodiff/modify-vector-param.slang b/tests/autodiff/modify-vector-param.slang
new file mode 100644
index 000000000..d6ddd7386
--- /dev/null
+++ b/tests/autodiff/modify-vector-param.slang
@@ -0,0 +1,35 @@
+//TEST(compute):COMPARE_COMPUTE_EX(filecheck-buffer=CHECK):-slang -compute -shaderobj -output-using-type
+//TEST(compute, vulkan):COMPARE_COMPUTE_EX(filecheck-buffer=CHECK):-vk -compute -shaderobj -output-using-type
+
+//TEST_INPUT:ubuffer(data=[0 0 0 0 0], stride=4):out,name=outputBuffer
+RWStructuredBuffer<float> outputBuffer;
+
+typedef float.Differential dfloat;
+
+struct Params
+{
+    float vv;
+}
+
+[Differentiable]
+float3 f(float3 x, uint2 v, Params p)
+{
+    v.x = 1 + int(p.vv);
+
+    x.y = x.x * x.x;
+    return x;
+}
+
+[numthreads(1, 1, 1)]
+void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
+{
+    {
+        var dpa = diffPair(float3(4.0, 2.0, 3.0));
+        Params p;
+        p.vv = 0.0;
+        __bwd_diff(f)(dpa, uint2(1,2), p, float3(1.0,1.0,1.0));
+
+        // CHECK: 9.0
+        outputBuffer[0] = dpa.d.x; // Expect: 9.0
+    }
+}