Fix issue with multiple namespace openings (#2176)

* #include an absolute path didn't work - because paths were taken to always be relative.

* Added sample-grad-clamp-lod sample.

* Fix handling multiple reopenings of namespaces.

2 files changed, 60 insertions, 0 deletions

diff --git a/tests/language-feature/namespaces/multiple-namespace.slang b/tests/language-feature/namespaces/multiple-namespace.slang
new file mode 100644
index 000000000..a687d5e79
--- /dev/null
+++ b/tests/language-feature/namespaces/multiple-namespace.slang
@@ -0,0 +1,56 @@
+// multiple-namespace.slang
+
+//TEST(compute):COMPARE_COMPUTE: -shaderobj
+
+// Multiple namespace open/closing
+
+namespace A
+{
+    struct Struct1
+    {
+        int a;
+    }
+}
+
+namespace A
+{
+    struct Struct2
+    {
+        int b;
+    }
+}
+
+namespace A
+{
+    struct Struct3
+    {
+        int c;
+    }
+}
+   
+// A few more 
+
+namespace A {}
+namespace A {}
+namespace A { namespace A {} }
+   
+int test(int val)
+{
+    A.Struct1 s1 = {};
+    A::Struct2 s2 = { val };
+    A.Struct3 s3 = { val * val };
+    
+    return s1.a + s2.b + s3.c;
+}
+
+//TEST_INPUT:ubuffer(data=[0 0 0 0], stride=4):out,name=outputBuffer
+RWStructuredBuffer<int> outputBuffer;
+
+[numthreads(4, 1, 1)]
+void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
+{
+    uint tid = dispatchThreadID.x;
+    int inVal = tid;
+    int outVal = test(inVal);
+    outputBuffer[tid] = outVal;
+}
diff --git a/tests/language-feature/namespaces/multiple-namespace.slang.expected.txt b/tests/language-feature/namespaces/multiple-namespace.slang.expected.txt
new file mode 100644
index 000000000..bfb7eefe7
--- /dev/null
+++ b/tests/language-feature/namespaces/multiple-namespace.slang.expected.txt
@@ -0,0 +1,4 @@
+0
+2
+6
+C