Shader multiplication accuracy causes visual bugs on some gpus. about cemu HOT 4 CLOSED

There is a graphics pack that fixes this.

Go to graphics packs and then download community packs. Turn on Grid and Border Fix in SMM’s Workarounds.

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There is a graphics pack that fixes this.

Go to graphics packs and then download community packs. Turn on Grid and Border Fix in SMM’s Workarounds.

I tested both workarounds and they both didn't work.

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I got mixed up in a reddit comment chain, the only workaround is to set the shader multiplication acuracy in the games profile or using vulkan, which you can't on that Fermi gpu.

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This is an interesting one. The cause of this issue is a bug in Nvidia's shader compiler where it optimizes too aggressively and breaks some math sequences. Randomly alternating instructions in the shader code can fix it, such as by changing the shader mul accuracy option. Nvidia fixed this bug many years ago already so it only affects GPUs that are beyond what we provide support for nowadays. Cemu had a workaround for the SMM bug specifically until either 1.26 or 2.0 (not sure which version is the cutoff), so maybe just stick to a slightly older version.

If someone wants to bother, they could probably make a proper graphic pack workaround for this that works with Cemu 2.0+. But otherwise I would say this is out of scope as we don't have the capacity to support ancient hardware with massively outdated drivers forever.

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