Update document regarding pointer (#4248)

And also add an actual test case from the User Guide example.

1 files changed, 31 insertions, 0 deletions

diff --git a/tests/spirv/pointer-from-user-guide.slang b/tests/spirv/pointer-from-user-guide.slang
new file mode 100644
index 000000000..662579c2b
--- /dev/null
+++ b/tests/spirv/pointer-from-user-guide.slang
@@ -0,0 +1,31 @@
+//TEST(compute, vulkan):SIMPLE(filecheck=SPV): -stage compute -entry computeMain -target spirv -emit-spirv-directly
+
+// This test is to verify the example on the user guide
+// and prevent any regressions.
+
+//TEST_INPUT:ubuffer(data=[0], stride=4):out,name=outputBuffer
+RWStructuredBuffer<float> outputBuffer;
+
+struct MyType
+{
+    float a;
+};
+
+float test(MyType* pObj)
+{
+    //SPV: OpTypePointer
+    MyType* pNext = pObj + 1;
+    MyType* pNext2 = &pNext[1];
+    return pNext.a + pNext->a + (*pNext2).a + pNext2[0].a;
+}
+
+cbuffer Constants
+{
+    MyType *ptr;
+};
+
+[numthreads(1,1,1)]
+void computeMain()
+{
+    outputBuffer[0] = test(ptr);
+}