Support for querying which parameters are used in emitted code (#2239)

See https://github.com/shader-slang/slang/issues/2213 

1 files changed, 52 insertions, 0 deletions

diff --git a/tests/reflection/used-parameters.slang b/tests/reflection/used-parameters.slang
new file mode 100644
index 000000000..efb605a14
--- /dev/null
+++ b/tests/reflection/used-parameters.slang
@@ -0,0 +1,52 @@
+// used-parameters.slang
+
+// Tests post-emit analysis of shader parameters to find out if they are used or not.
+
+//TEST:REFLECTION:-stage compute -entry main -target hlsl
+
+
+struct S
+{
+    uint2 Size;
+};
+
+ConstantBuffer<S> UsedCB;
+ConstantBuffer<S> UnusedCB;
+
+Texture2D UsedTexture;
+Texture2D UnusedTexture;
+
+Buffer<uint> UsedBuffer;
+Buffer<uint> UnusedBuffer;
+
+StructuredBuffer<uint> UsedStructuredBuffer;
+StructuredBuffer<uint> UnusedStructuredBuffer;
+
+RWTexture2D UsedRWTexture;
+RWTexture2D UnusedRWTexture;
+
+RWBuffer<uint> UsedRWBuffer;
+RWBuffer<uint> UnusedRWBuffer;
+
+RWStructuredBuffer<uint> UsedRWStructuredBuffer;
+RWStructuredBuffer<uint> UnusedRWStructuredBuffer;
+
+SamplerState UsedSampler;
+SamplerState UnusedSampler;
+
+uniform uint UsedUniform;
+uniform uint UnusedUniform;
+
+[numthreads(1, 1, 1)]
+void main(uint3 dispatchThreadID : SV_DispatchThreadID)
+{
+    float A = UsedTexture[dispatchThreadID.xy].x;
+    uint B = UsedBuffer[dispatchThreadID.x];
+    uint C = UsedStructuredBuffer[dispatchThreadID.y];
+    float D = UsedRWTexture[dispatchThreadID.xy].x;
+    uint E = UsedRWBuffer[dispatchThreadID.y];
+    float F = UsedTexture.SampleLevel(UsedSampler, float2(dispatchThreadID.xy) / float2(UsedCB.Size), 0).x;
+    uint G = UsedUniform;
+
+    UsedRWStructuredBuffer[dispatchThreadID.x + dispatchThreadID.y * UsedCB.Size.x] = uint(A) + B + C + uint(D) + E + uint(F) + G;
+}
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