Forums - Possible wrong value for maxUniformBufferRange in VkPhysicalDeviceLimits

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Possible wrong value for maxUniformBufferRange in VkPhysicalDeviceLimits
andersrein87
Join Date: 23 May 21
Posts: 4
Posted: Sat, 2022-01-15 06:19

I'm currently working on a native vulkan based application for the Oculus Quest platform. I've been originally developing on Oculus Quest 2 (Snapdragon XR2/Adreno 650), but when I tried the application on Oculus Quest 1 (Snapdragon 835/Adrendo 540)  it did not work. I tracked it down to the fact that I was using the maximum size of the uniform buffer size reported by VkPhysicalDeviceLimits::maxUniformBufferRange. Both devices report this as 65536, but when I use a uniform buffer with this size on Oculus Quest 1 all values seems to be interpreted as zero in the shader.

If I subtract 16 so that the buffer becomes 65520 it works. If I subtract 15 so that buffer becomes 65521 is does not work.

Is this a known bug in the driver?

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DuBo
Join Date: 9 Dec 13
Posts: 41
Posted: Fri, 2022-02-11 07:32

It looks interesting.
Do you have one sample code to show the issue  then we can verify it internally?

Thanks
Bob Du

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