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I am seeing the same issue on my MBP with a single internal card ( Intel(R) Iris(TM) Plus Graphics 640) . Read-Write with RGBAFloat32 pixel format was working on MacOS Mojave and Xcode 10.3. But since upgrading to Catalina and Xcode 11 I am getting the following error: "Shader uses texture(output[0]) as read-write, but hardware does not support read-write texture of this pixel format." Looks like a regression to me.