1 files changed, 61 insertions, 0 deletions
diff --git a/tests/compute/global-type-param2.slang b/tests/compute/global-type-param2.slang
new file mode 100644
index 000000000..b54f4c430
--- /dev/null
+++ b/tests/compute/global-type-param2.slang
@@ -0,0 +1,61 @@
+//TEST(smoke,compute):COMPARE_COMPUTE:-xslang -use-ir
+//TEST_INPUT: cbuffer(data=[0.5 0 0 0], stride=4):dxbinding(0),glbinding(0)
+//TEST_INPUT: cbuffer(data=[1.0], stride=4):dxbinding(1),glbinding(1)
+//TEST_INPUT: Texture2D(size=4, content = zero) : dxbinding(0),glbinding(0)
+//TEST_INPUT: Texture2D(size=4, content = one) : dxbinding(1),glbinding(1)
+//TEST_INPUT: Sampler : dxbinding(0),glbinding(0,1,2,3,4,5,6)
+//TEST_INPUT: Sampler : dxbinding(1),glbinding(0,1,2,3,4,5,6)
+//TEST_INPUT: ubuffer(data=[0], stride=4):dxbinding(0),glbinding(0),out
+//TEST_INPUT: type Impl
+
+
+/* Testing this scenario: 
+The ProgramLayout before specializeIRForEntryPoint() has no global cbuffer
+allocated because the program before specialization does not define any
+global uniform variables.
+
+However, after specialization, we find ourselves needing a global constant
+buffer. The compiler should allocate the next available constant buffer slot
+(here c1 because c0 is already used by the explicit cbuffer decl `existingBuffer`)
+for the newly generated global constant buffer.
+*/
+
+RWStructuredBuffer<float> outputBuffer;
+
+interface IBase
+{
+    float compute();
+}
+
+struct Impl : IBase
+{
+    float base;  // = 1.0
+    Texture2D tex;
+    SamplerState sampler;
+    float compute()
+    {
+        return tex.SampleLevel(sampler, float2(0.0), 0.0).x + base;
+    }
+};
+
+__generic_param TImpl : IBase;
+
+TImpl impl;
+
+// at binding c0:
+cbuffer existingBuffer
+{
+	float base0; // = 0.5
+}
+Texture2D tex1;  // = 0.0
+SamplerState sampler;
+
+[numthreads(1, 1, 1)]
+void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
+{
+	uint tid = dispatchThreadID.x;
+    float b0 = tex1.SampleLevel(sampler, float2(0.0), 0.0).x + base0; // = 0.5
+	float outVal = impl.compute();  // = 2.0
+    outVal = b0 / outVal; // = 0.25
+	outputBuffer[tid] = outVal;
+}
+\ No newline at end of file