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Question What is the issue with native renderpass and XR ?

Discussion in 'Universal Render Pipeline' started by XRA, Jul 14, 2021.

  1. XRA

    XRA

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    Noticed that RenderPass gets disabled if using XR in URP 12, would like some insight as to why, and will it be supported in the future?
     
    XRA, Jul 14, 2021
    #1

  2. Immersive-Matthew

    Immersive-Matthew

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    How did you determine it was disabled?
     
    Immersive-Matthew, Nov 3, 2021
    #2

  3. ManueleB

    ManueleB

    Unity Technologies

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    Hey,
    Native Render Pass support is still work in progress and experimental so it only supports Metal and Vulkan mobile platforms at the moment. Work on adding XR support has started and is in progress, should be available in one of the next releases.
     
    ManueleB, Nov 4, 2021
    #3
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  4. Immersive-Matthew

    Immersive-Matthew

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    Thanks Manuele. What will be the benefits of Render Pass?
     
    Immersive-Matthew, Nov 11, 2021
    #4
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  5. ManueleB

    ManueleB

    Unity Technologies

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    in short, mobile performance optimizations

    It allows URP to take full advantage of TBDR GPUs (mobile) by using the Unity RenderPass API under the hood. If you are familiar with APIs like Vulkan or Metal, it does this by explicitly giving control of the render pass/subpasses setup done in the underlying graphics API.
    This also enables optimizations like framebuffer fetch/programmable blending to minimize bandwidth and battery usage on those devices.

    You can find more info and usage examples on the RenderPass API here:
    https://docs.unity3d.com/2021.2/Doc....ScriptableRenderContext.BeginRenderPass.html
     
    ManueleB, Nov 16, 2021
    #5
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  6. Immersive-Matthew

    Immersive-Matthew

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    Sounds like I need to give this a try once 2021.2.x has the various bugs addressed. Thank you!
     
    Immersive-Matthew, Nov 19, 2021
    #6
    ManueleB likes this.

  7. hippocoder

    hippocoder

    Digital Ape

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    This sounds essential for Quest 2 and beyond really. Being able to reduce post or even HDR cost on that platform would be amazing!
     
    hippocoder, Nov 22, 2021
    #7

  8. nosv

    nosv

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    Are there any updates on this? I've noticed that Render Passes are still disabled for XR in the latest version of URP.
     
    nosv, Jun 18, 2023
    #8

  9. ManueleB

    ManueleB

    Unity Technologies

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    it should be available in 23.2, the work is currently close to land. Due to the size of the changes it won't be possible to backport it to previous versions
     
    ManueleB, Jun 20, 2023
    #9
    nosv likes this.