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virtualHCG's avatar
virtualHCG
Expert Protege
7 years ago

Vulkan and HDR on Quest actually possible?

So far the recommendation is to turn off Mobile HDR but I keep reading this articles online referencing that Vulkan would allow for Mobile HDR on the Quest, for example, quoting from https://venturebeat.com/2019/08/10/unreal-engine-now-supports-vulkan-for-oculus-quest-and-go/ :

"Facebook claims that on Epic’s Sun Temple engine sample Vulkan reduces frame times from 16ms to 13ms, a roughly 20% improvement. The company also explained that Vulkan allows for HDR rendering."

I tested it and my project crashes at launch on the Quest when built with Mobile HDR ON and only Vlukan enabled (works fine with HDR OFF and only Vulkan enabled). Is this something actually possible right now? Using OpenGL and HDR ON also causes a crash, which seems to be expected, but I was wondering if based on Facebook's statements this is different with Vulkan. All my tests have been done using the latest 4.23 integration.

Thanks!


8 Replies

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  • rasamaya's avatar
    rasamaya
    Explorer
    6 years ago
    Yup Vulkan crashes with Mobile HDr for me too. Very difficult to post process or even white balance walls etc. Annoying for sure.
  • virtualHCG's avatar
    virtualHCG
    Expert Protege
    6 years ago
    From my experience, it seems that unless another forum user knows the answer, questions posted in this forum go unanswered by official Oculus support staff (I guess that is why the forums are listed under the "Self-Help Resources" header in their support page). I've had better luck submitting a bug ticket directly, which might eventually get answered. I just did that here: https://developer.oculus.com/bugs/bug/460164121326245/
  • Anonymous's avatar
    Anonymous
    6 years ago
    I've been testing everything to get postprocessing but failed miserably. No Quest HDR and PostProcessing layer and Ambient Occlusion.
  • Anonymous's avatar
    Anonymous
    6 years ago
    hmm.. PP is for sure to expensive. Even if you would build for the Rift and PC-GPU. But I really wonder how the Mobile HDR effects the performance. Did you run any tests you could share when just using Mobile HDR? 

    thanks a lot for any info... cheers!
  • motorsep's avatar
    motorsep
    Start Partner
    6 years ago
    It's been said many many times - do not use HDR on mobile VR. It's performance heavy. 

    What Epic should have done is provided LDR bloom and some other PP options, so that PP could be used without HDR on mobile (like good ol' PC games that didn't have HDR, but had quite a few PP effects)
  • GeoffreyBoy's avatar
    GeoffreyBoy
    Explorer
    6 years ago

    motorsep said:

    It's been said many many times - do not use HDR on mobile VR. It's performance heavy. 

    What Epic should have done is provided LDR bloom and some other PP options, so that PP could be used without HDR on mobile (like good ol' PC games that didn't have HDR, but had quite a few PP effects)


    Thanks for the tips.