SwapChain: Reduce buffer count from 3 to 2

src/common/vulkan/swap_chain.cpp

@@ -595,7 +595,7 @@ bool SwapChain::CreateSwapChain()
     return false;
 
   // Select number of images in swap chain, we prefer one buffer in the background to work on
-  u32 image_count = std::max(surface_capabilities.minImageCount + 1u, 2u);
+  u32 image_count = std::max(surface_capabilities.minImageCount, 2u);
 
   // maxImageCount can be zero, in which case there isn't an upper limit on the number of buffers.
   if (surface_capabilities.maxImageCount > 0)

src/frontend-common/d3d11_host_display.cpp

@@ -326,6 +326,9 @@ bool D3D11HostDisplay::CreateRenderDevice(const WindowInfo& wi, std::string_view
     Log_WarningPrint("Failed to get parent adapter/device/factory");
     return false;
   }
+  ComPtr<IDXGIDevice1> dxgi_device1;
+  if (SUCCEEDED(dxgi_device.As(&dxgi_device1)))
+    dxgi_device1->SetMaximumFrameLatency(1);
 
   DXGI_ADAPTER_DESC adapter_desc;
   if (SUCCEEDED(dxgi_adapter->GetDesc(&adapter_desc)))
@@ -412,7 +415,7 @@ bool D3D11HostDisplay::CreateSwapChain(const DXGI_MODE_DESC* fullscreen_mode)
   swap_chain_desc.BufferDesc.Height = height;
   swap_chain_desc.BufferDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
   swap_chain_desc.SampleDesc.Count = 1;
-  swap_chain_desc.BufferCount = 3;
+  swap_chain_desc.BufferCount = 2;
   swap_chain_desc.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;
   swap_chain_desc.OutputWindow = window_hwnd;
   swap_chain_desc.Windowed = TRUE;

src/frontend-common/d3d12_host_display.cpp

@@ -313,7 +313,7 @@ bool D3D12HostDisplay::CreateSwapChain(const DXGI_MODE_DESC* fullscreen_mode)
   swap_chain_desc.BufferDesc.Height = height;
   swap_chain_desc.BufferDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
   swap_chain_desc.SampleDesc.Count = 1;
-  swap_chain_desc.BufferCount = 3;
+  swap_chain_desc.BufferCount = 2;
   swap_chain_desc.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;
   swap_chain_desc.OutputWindow = window_hwnd;
   swap_chain_desc.Windowed = TRUE;