On Windows, eframe offered wgpu every backend and wgpu ranked Vulkan
first. On a laptop with two AMD GPUs whose drivers are years apart, the
Vulkan driver faults (0xc0000005 inside amdvlk64.dll) right after the
first frame, so the app died as its window opened. An access violation
in a driver thread is not something the app can catch.
Offer wgpu Direct3D 12 on Windows, with OpenGL behind it for hardware
without a Direct3D 12 driver. WGPU_BACKEND still names the backend on
every system, and other systems keep eframe's defaults.
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
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