metal: cell bg pipeline no longer has vertex data, needs no vertex desc #2068
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This happened to work in releases somehow but Xcode debug builds would catch this as an assertion. Our cell bg pipeline now uses the "full screen vertex shader" which takes no parameters, so we don't need a vertex descriptor.
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This happened to work in releases somehow but Xcode debug builds would catch this as an assertion. Our cell bg pipeline now uses the "full screen vertex shader" which takes no parameters, so we don't need a vertex descriptor.