Execute viewport offscreen frames through D3D12 host

new_editor/app/Host/D3D12WindowRenderer.cpp

@@ -174,6 +174,24 @@ bool D3D12WindowRenderer::BeginFrame() {
     return true;
 }
 
+bool D3D12WindowRenderer::SubmitFrame(bool presentSwapChain) {
+    if (m_commandList == nullptr || m_commandQueue == nullptr) {
+        return false;
+    }
+
+    if (presentSwapChain && m_swapChain == nullptr) {
+        return false;
+    }
+
+    m_commandList->Close();
+    void* commandLists[] = { m_commandList };
+    m_commandQueue->ExecuteCommandLists(1, commandLists);
+    if (presentSwapChain) {
+        m_swapChain->Present(1, 0);
+    }
+    return true;
+}
+
 ID3D12Device* D3D12WindowRenderer::GetDevice() const {
     const D3D12Device* device = GetD3D12Device();
     return device != nullptr ? device->GetDevice() : nullptr;