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MESA_VK_DEVICE_SELECT_FORCE_DEFAULT_DEVICE=1 is useful but it's tedious to type. This commit extends slightly DRI_PRIME/MESA_VK_DEVICE_SELECT syntax support: if "!" is appended at the end then only the selected GPU will be made visible to the application. Reviewed-by:
Adam Jackson <ajax@redhat.com> Part-of: <!24750>
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