tests/wayland: Update documentation for MUTTER_REF_TEST_UPDATE
For some reason `LIBGL_ALWAYS_SOFTWARE=1` does not work as intended while `MESA_LOADER_DRIVER_OVERRIDE=swrast` does. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1055>
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* existing reference image is pixel identical to the newly created one.
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* existing reference image is pixel identical to the newly created one.
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*
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*
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* Updating test reference images also requires using a software OpenGL
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* Updating test reference images also requires using a software OpenGL
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* renderer, which can be achieved using LIBGL_ALWAYS_SOFTWARE=1
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* renderer, which can be achieved using MESA_LOADER_DRIVER_OVERRIDE=swrast
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*
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*
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* For example, for the test case '/path/to/test/case', run the test
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* For example, for the test case '/path/to/test/case', run the test
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* inside
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* inside
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*
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*
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* ```
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* ```
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* env LIBGL_ALWAYS_SOFTWARE=1 MUTTER_REF_TEST_UPDATE='/path/to/test/case`
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* env MESA_LOADER_DRIVER_OVERRIDE=swrast MUTTER_REF_TEST_UPDATE='/path/to/test/case`
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* ```
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* ```
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*
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*
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*/
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*/
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