Add test case for `makeStruct` transcription. (#2705)

* Add test case for `makeStruct` transcription.

* Update documentation on `no_diff`.

* Update toc

---------

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

2 files changed, 39 insertions, 0 deletions

diff --git a/tests/autodiff/make-struct-mixed-type.slang b/tests/autodiff/make-struct-mixed-type.slang
new file mode 100644
index 000000000..bc966eff7
--- /dev/null
+++ b/tests/autodiff/make-struct-mixed-type.slang
@@ -0,0 +1,34 @@
+//TEST(compute):COMPARE_COMPUTE_EX:-slang -compute -shaderobj -output-using-type
+//TEST(compute, vulkan):COMPARE_COMPUTE_EX:-vk -compute -shaderobj -output-using-type
+
+//TEST_INPUT:ubuffer(data=[0 0 0 0], stride=4):out,name=outputBuffer
+RWStructuredBuffer<float> outputBuffer;
+
+struct MixedType : IDifferentiable
+{
+    no_diff float noDiffField;
+    float field;
+}
+
+[BackwardDifferentiable]
+float f1(MixedType m)
+{
+    return 2.0 * m.field;
+}
+
+[BackwardDifferentiable]
+float f(MixedType m)
+{
+    MixedType m1 = { m.noDiffField, m.field };
+    return f1(m1);
+}
+
+[numthreads(1, 1, 1)]
+void computeMain(uint3 dispatchThreadID: SV_DispatchThreadID)
+{
+    MixedType v = { 0, 2.0 };
+    MixedType.Differential dv = { 0.0 };
+    var p = diffPair(v, dv);
+    __bwd_diff(f)(p, 1.0);
+    outputBuffer[0] = p.d.field;
+}
\ No newline at end of file
diff --git a/tests/autodiff/make-struct-mixed-type.slang.expected.txt b/tests/autodiff/make-struct-mixed-type.slang.expected.txt
new file mode 100644
index 000000000..0e6e3be96
--- /dev/null
+++ b/tests/autodiff/make-struct-mixed-type.slang.expected.txt
@@ -0,0 +1,5 @@
+type: float
+2.0
+0.0
+0.0
+0.0
\ No newline at end of file