Generic experiments (#2119)

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

* Small fixes.
Added compiler crash with generic defined in a function.
Added enum-flags test that works (by limiting backing type to int), and using __EnumType constraint.

* Add comment about crash.

* Disable crashing test.

1 files changed, 45 insertions, 0 deletions

diff --git a/tests/experiments/generic/enum-int-flags-2.slang b/tests/experiments/generic/enum-int-flags-2.slang
new file mode 100644
index 000000000..c5283fb7e
--- /dev/null
+++ b/tests/experiments/generic/enum-int-flags-2.slang
@@ -0,0 +1,45 @@
+//DISABLE_TEST(compute):COMPARE_COMPUTE_EX:-slang -compute -shaderobj
+
+/* A test to use generics to treat an enum as a set. 
+Here we simplify previous example, by not allowing the backing type be 
+a specialization parameter (and just use int).
+
+Moreover here E is constrained to __EnumType.
+
+Works
+*/
+
+//TEST_INPUT:ubuffer(data=[0 0 0 0], stride=4):out,name outputBuffer
+RWStructuredBuffer<float> outputBuffer;
+
+enum Enum
+{
+    A = 0x1,
+    B = 0x2, 
+    C = 0x4,
+};
+
+__generic<E : __EnumType>
+struct Flags
+{
+    [mutating] void set(E e) { value |= (int)e; }
+    bool isSet(E e) { return (((int)e) & value) != 0; }
+    int value = 0;
+};
+
+[numthreads(4, 1, 1)]
+void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
+{
+    int index = dispatchThreadID.x;
+    
+    Flags<Enum> flags;
+
+    if (index & 1)
+    {
+        flags.set(Enum::A);
+    }
+    bool isASet = flags.isSet(Enum::A);
+   
+	outputBuffer[index] = isASet ? 2 : 1;
+}
+