![]() When the application calls rendering commands, D3D9 will validate those commands, and then will convert those commands to the D3D9 DDI and send it to D3D9On12, just like any D3D9 driver. When this happens, d3d9on12.dll is loaded by the D3D9 runtime and initialized. When an application creates a D3D9 device, they may choose for it to be a D3D9On12 device, rather than a native D3D9 device (see Direct3DCreate9On12 and Direct3DCreate9On12Ex). That means it is not a binary named d3d9.dll, but is named d3d9on12.dll. D3D9On12 is not an implementation of the D3D9 API, but is instead an implementation of the D3D9 usermode DDI (device driver interface).
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