feat(RHI): 实现 RHISwapChain 抽象基类

engine/src/RHI/D3D12/D3D12SwapChain.cpp

@@ -105,5 +105,19 @@ void* D3D12SwapChain::GetNativeHandle() const {
     return reinterpret_cast<void*>(m_swapChain.Get());
 }
 
+RHITexture* D3D12SwapChain::GetCurrentBackBuffer() {
+    return GetBackBuffer(GetCurrentBackBufferIndex());
+}
+
+bool D3D12SwapChain::ShouldClose() const {
+    return false;
+}
+
+void D3D12SwapChain::SetShouldClose(bool shouldClose) {
+}
+
+void D3D12SwapChain::PollEvents() {
+}
+
 } // namespace RHI
 } // namespace XCEngine