Fix unused space discovery for bindless heap. (#8075)

1 files changed, 41 insertions, 0 deletions

diff --git a/tests/spirv/descriptor-heap-space.slang b/tests/spirv/descriptor-heap-space.slang
new file mode 100644
index 000000000..8ab905b87
--- /dev/null
+++ b/tests/spirv/descriptor-heap-space.slang
@@ -0,0 +1,41 @@
+//TEST:SIMPLE(filecheck=CHECK): -target glsl -entry main
+
+// Test that we can find the correct unused descriptor set index when there is `ParameterBlock` in the shader.
+
+//CHECK: layout(binding = 2, set = 2)
+//CHECK-NEXT: uniform texture2D  _slang_resource_heap
+
+struct VSInput{
+    float3 position;
+}
+
+struct VSOutput{
+    float4 position : SV_Position;
+}
+
+struct CameraData{
+    float3 position;
+}
+
+ParameterBlock<CameraData> cameraData;
+
+
+struct Material{
+    DescriptorHandle<Texture2D> texture;
+    DescriptorHandle<SamplerState> samplerState;
+}
+
+StructuredBuffer<Material> materials;
+
+struct FSOutput{
+    float4 outColor : SV_Target0;
+}
+
+
+[shader("fragment")]
+FSOutput main(){
+    FSOutput output;
+    output.outColor = materials[0].texture.Sample(materials[0].samplerState, float2(0));
+    output.outColor.x *= cameraData.position.x;
+    return output;
+}
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