Support dependent generic constraints. (#4870)

* Support dependent generic constraints.

* Fix warning.

* Update comment.

* Fix.

* Add a test case to verify fix of #3804.

* Address review.

1 files changed, 32 insertions, 0 deletions

diff --git a/tests/language-feature/generics/dependent-generic-3.slang b/tests/language-feature/generics/dependent-generic-3.slang
new file mode 100644
index 000000000..024d09285
--- /dev/null
+++ b/tests/language-feature/generics/dependent-generic-3.slang
@@ -0,0 +1,32 @@
+//TEST(compute):COMPARE_COMPUTE(filecheck-buffer=CHECK): -shaderobj -output-using-type
+//TEST(compute):COMPARE_COMPUTE(filecheck-buffer=CHECK): -vk -shaderobj -output-using-type
+
+//TEST_INPUT:ubuffer(data=[0 0 0 0], stride=4):out,name=outputBuffer
+RWStructuredBuffer<int> outputBuffer;
+
+interface IOperation<T : __BuiltinFloatingPointType>
+{
+  static T apply(T lhs, T rhs);
+};
+ 
+T applyOp<T:__BuiltinFloatingPointType, TOp:IOperation<T>>(T lhs, T rhs)
+{
+  return TOp::apply(lhs, rhs);
+}
+
+struct AddOp<T : __BuiltinFloatingPointType> : IOperation<T>
+{
+    static T apply(T lhs, T rhs)
+    {
+        return lhs + rhs;
+    }
+}
+
+[numthreads(1, 1, 1)]
+void computeMain(int3 dispatchThreadID : SV_DispatchThreadID)
+{
+    let result = applyOp<float, AddOp<float>>(1.0, 2.0);
+
+    // CHECK: 3
+    outputBuffer[0] = (int)result;
+}