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@@ -56,3 +56,11 @@ it change the value of `SDL_VIDEO_VULKAN` to 0 in `SDL_config_windows.h`. You
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must install the [Vulkan SDK](https://www.lunarg.com/vulkan-sdk/) in order to
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use Vulkan graphics in your application.
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+## Transparent Window Support
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+
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+SDL uses the Desktop Window Manager (DWM) to create transparent windows. DWM is
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+always enabled from Windows 8 and above. Windows 7 only enables DWM with Aero Glass
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+theme.
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+
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+However, it cannot be guaranteed to work on all hardware configurations (an example
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+is hybrid GPU systems, such as NVIDIA Optimus laptops).
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Sam Huang