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qemu: use DXMT when Rosetta is not installed - #7972
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D3DMetal.framework is x86_64 only, so on Apple Silicon the Neptune render worker that loads it runs under Rosetta. The default DirectX driver picks D3DMetal whenever the framework is bundled, so on a Mac without Rosetta the worker can never start and Windows guests with the 3D drivers boot to "Display output is not active". Fall back to DXMT when Rosetta is not installed, and only offer D3DMetal in Settings once it is. Assisted-by: Claude:claude-opus-5-5
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D3DMetal.framework is x86_64 only, so on Apple Silicon the Neptune render worker that loads it runs under Rosetta. The default DirectX driver picks D3DMetal whenever the framework is bundled, so on a Mac without Rosetta the worker never starts and Windows guests with the 3D drivers boot to "Display output is not active".
This falls back to DXMT when Rosetta is not installed (using the existing
VZLinuxRosettaDirectoryShare.availabilitycheck), and only offers D3DMetal in Settings once Rosetta is installed. Intel Macs and iOS are unchanged.Testing: Tested by a human on macOS 27.0, MacBook Air (M3).
The author acknowledges that this change has been tested and/or reviewed by a human in accordance with UTM's AI contribution guidelines.