primitive_assembly: Add getters for internal state

src/video_core/primitive_assembly.cpp

@@ -71,6 +71,16 @@ void PrimitiveAssembler<VertexType>::Reconfigure(PipelineRegs::TriangleTopology
     this->topology = topology;
 }
 
+template <typename VertexType>
+bool PrimitiveAssembler<VertexType>::IsEmpty() const {
+    return buffer_index == 0 && strip_ready == false;
+}
+
+template <typename VertexType>
+PipelineRegs::TriangleTopology PrimitiveAssembler<VertexType>::GetTopology() const {
+    return topology;
+}
+
 // explicitly instantiate use cases
 template struct PrimitiveAssembler<Shader::OutputVertex>;