LG1PclAmbienceStencil: allocate stencils in constructor

stimBuffApis/livoxGen1/lg1PcloudAmbienceStencil.h

@@ -32,11 +32,45 @@ public:
 	stencilBuffer(
 		stencilBufferConstraints,  // Input constraints
 		stencilBufferConstraints,  // Output constraints (same as input)
-		nDgramsPerFrame)
+		nDgramsPerFrame),
+	nRangeDescriptors(0)
 	{}
 
+	~LG1PcloudAmbienceStencil() = default;
+
+	// Implement pure virtual functions from Stencil
+	bool hasData() const override
+	{
+		return nRangeDescriptors > 0;
+	}
+
+	size_t getRelevantCount() const override
+	{
+		// TODO: Implement based on range descriptors
+		return 0;
+	}
+
+	bool isRelevant(size_t offset) const override
+	{
+		// TODO: Implement based on range descriptors
+		(void)offset;
+		return false;
+	}
+
+	size_t getNRangeDescriptors() const override
+	{
+		return nRangeDescriptors;
+	}
+
+	bool buildStencilMetadata() override
+	{
+		// TODO: Implement stencil metadata building
+		return true;
+	}
+
 public:
 	StagingBuffer stencilBuffer;
+	size_t nRangeDescriptors;
 };
 
 } // namespace stim_buff