Building for Quest Pro; why is Unsweep, Scan, and Downsweep not supported?

[edhyah]

Referring to this project: https://github.com/b0nes164/UnityGaussianSplatting

I'm trying to build this project for the Meta Quest Pro. Unlike others, I can't get it to build; specifically, in GpuSorting.cs, m_Valid is false (snippet below):

        public GpuSorting(ComputeShader cs)
        {
            m_CS = cs;
            if (cs)
            {
                m_kernelInitDeviceRadixSort = cs.FindKernel("InitDeviceRadixSort");
                m_kernelUpsweep = cs.FindKernel("Upsweep");
                m_kernelScan = cs.FindKernel("Scan");
                m_kernelDownsweep = cs.FindKernel("Downsweep");
            }

            m_Valid = m_kernelInitDeviceRadixSort >= 0 &&
                      m_kernelUpsweep >= 0 &&
                      m_kernelScan >= 0 &&
                      m_kernelDownsweep >= 0;
            if (m_Valid)
            {
                if (!cs.IsSupported(m_kernelInitDeviceRadixSort) ||
                    !cs.IsSupported(m_kernelUpsweep) ||
                    !cs.IsSupported(m_kernelScan) ||
                    !cs.IsSupported(m_kernelDownsweep))
                {
                    m_Valid = false;
                }
            }
            ...

It's set to false because m_kernelUpsweep, m_kernelScan, and m_kernelDownsweep are all not supported.

Why is this the case? Is this because I'm building this project on a Macbook? I'm wondering if this is the case because when I go to Unity and go to the Inspector for the shader, I get the errors shown below, which seems to show some issues with Metal. However, the platform I'm building for is Android, so I feel like this shouldn't be the case. Anyhow, I'm a total newb at this, so excuse any sillyness.

[b0nes164]

The editor error is showing up because whatever Mac you have does not support Metal 2.3+, or your macOS version is out of date and does not support Metal 2.3+.

Now, that should not stop you from building though; the error is just stopping the project from running in the editor.

However, if you do get it to build, there are ongoing issues on Adreno 600 series chips. See Issue #4 on this repo.