message: Allow test_ReadPixels with SwiftShader.
diff: @@ -337,7 +337,7 @@ if (APPLE)
  endif()
  endif()
  -if (APPLE AND NOT IOS AND NOT FILAMENT_USE_SWIFTSHADER)
  +if (APPLE AND NOT IOS)
  add_executable(backend_test_mac test/mac_runner.mm)
  target_link_libraries(backend_test_mac PRIVATE "-framework Metal -framework AppKit -framework QuartzCore")
  # Because each test case is a separate file, the -force_load flag is necessary to prevent the
  