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Official GPU Driven Rendering In Unity

Discussion in 'Unity 6 Beta' started by Tim-C, Oct 6, 2023.

  1. Tim-C

    Tim-C

    Unity Technologies

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    Hi everyone!

    For quite some time we have been working on some deep performance improvements to how we do rendering and batching of draws for Unity. These improvements are designed out of the box to ‘just work’ with projects you have already created with URP and HDRP. We would like to share this work with you now so that we can get some feedback.. We want it to be rock solid and work for all platforms that are capable of handling this improvement. What is described in this post is available in 2023.3a8

    Background
    About a year ago we introduced the reworked BatchRendererGroup API for Unity 2022.1, and while this API allows for some great performance benefits you either need to use Entities Graphics or do a lot of custom coding to put your objects into this API. We thought this was not good enough and we want many more Unity projects to be able to benefit from faster batching and performance without needing to be modified. So we decided to write a system to make this possible…


    Garden Scene Running with the GPU Resident Drawer.

    GPU Resident Drawer
    In the latest 2023.3 alpha we have landed a new rendering system which is called the GPU Resident Drawer. This is a ‘behind the curtain’, GPU driven, system that allows you to author your game using game objects and when processed they will be ingested and rendered via a special fast path that handles better instancing. The improvements you will see using this feature are dependent on the scale of your scenes and the amount of instancing you utilize. The more instanceable objects you render the larger the benefits you will see. This feature is specifically for standard MeshRenderes. It will not handle skinned mesh renderers, VFX Graphs, particle systems or similar effects renderers.

    How to enable the GPU Resident Drawer
    The system can be enabled within the HDRP or URP Render Pipeline Asset. You should find the option GPU Resident Drawer Mode. Selecting Instanced Drawing enables the feature, and you can also select if you want the feature to be enabled just in play mode or in edit mode as well.

    URP:



    HDRP:


    Some specific settings also need to be set, there are UI affordances that will tell you if your project is not configured properly, the specifics are:
    • BatchRendererGroup variant stripping needs to be set to Keep All, otherwise stand alone player builds will not render the converted objects.

    • In URP you must be in Forward+ rendering mode.

    • Static batching should be turned off. This is not required, but with static batching off instancing will do a better job, which results in fewer draw calls.

    • Under Lightmapping Settings in Lighting Settings check Fixed Lightmap Size and uncheck Use Mipmap Limits, this is also not required but will also result in fewer draw calls.

    The system supports dynamic changes to game objects - the conversion runs incrementally and will pick up newly created objects as well as changed objects. This happens once per frame after LateUpdate but before Rendering begins - this means that if you are moving objects during rendering (for example in the RenderPipelineManager.beginCameraRendering callback) they may have incorrect data when rendering happens. You will want to force these objects to NOT be rendered via the GPU Resident Drawer using the “DisallowGPUDrivenRendering” MonoBehaviour.

    Finally, the system is also compatible with Umbra occlusion culling so if you are already using that in your projects you will continue to see that benefit.

    Objects rendered via the GPU Resident Drawer show up in the frame debugger as ‘Hybrid Batch Group’. In the spaceship scene the full g-buffer is laid down using the GPU Resident Drawer path.




    Feature Support
    The GPU resident drawer is supported on the modern rendering backends within Unity - specifically anywhere compute shaders are enabled this functionality should work. When your project is running on a platform that does not meet the required hardware capabilities the rendering will fall back to the traditional, non GPU, pathway.

    One further specific note: OpenGL and GLES are explicitly not supported. The GPU Resident Drawer will fall back to regular game object rendering on these rendering backends even if they support compute shaders.

    When the feature is enabled some objects may still not render via the new path, in these cases they will draw via the regular rendering paths.

    Specific cases that are not compatible:

    • The light probe usage on the renderer is set to use proxy volume
    • The renderer is affecting or is affected by real time global illumination
    • The renderer has a MaterialPropertyBlock attached
    • The shader used by the material is incompatible with DOTS Instancing
    • The renderer has per instance rendering callbacks attached (OnRenderObject etc)
    • The Gameobject has the DisallowGPUDrivenRendering component attached.
    Compatibility Notes
    Not all objects can be rendered using the GPU Resident drawer and you may need to manually mark some objects to not render via this path.

    The situations we are aware of where you might need to do this:
    • You are using a ‘custom pass’ in URP and that custom pass does not support the dots keyword but the main material does. This can not be detected by the system and the custom pass will fail to render.

    • You are updating the transform on a per camera rendering basis. We update the objects in the GPU cache one time per frame right before the Unity rendering pipeline is executed. It is not recommended to update object positions while the render pipeline is activated (i.e. per camera) but if you must do this then you will need to mark the objects to not go via the GPU pipeline.

    To force a GameObject to render via the GameObject path instead of the GPU resident drawer, add the new DisallowGPUDrivenRendering component to it.If you need to use this script for situations outside of those listed above please let us know why so we can improve the system or documentation.

    Performance
    The GPU Resident drawer is specifically a CPU time optimization and may change GPU performance characteristics; please read to the end of this section to understand more.

    How much CPU time is gained varies depending on the content that is rendered. Specifically content with more instancing and similar will benefit more as less draw calls will need to be submitted to the GPU. From our testing we have seen some larger scenes benefit massively, halving the CPU frame time. Smaller scenes also tend to benefit but often only show marginal improvements.

    Here we have some numbers from an internal test project, your scenes may differ so please profile on your own projects to be sure.

    On the project in the Editor running on Metal we go from about 15ms main thread rendering and 31ms render thread time with the regular Game Objects path





    CPU Time Improvements
    Screenshot 2023-10-06 at 11.35.56.png

    GPU performance notes
    GPU performance may be negatively affected by drawing using the DOTS Instancing variant and this will be different depending on the device the content is rendering on. This is due to how data is loaded by the shaders which is different when using this feature. This effect will be more prominent on lower powered mobile GPUs but in many cases is also offset by the reduced number of draw calls. We would love to hear your feedback on the performance when using this feature on the projects that you are developing.

    Additional Notes
    • Culling might differ slightly as the culling code has been reimplemented in C#. If you notice issues here please report them.

    • Setting BatchRendererGroup variant stripping to Keep All will increase shader variant count for player builds. This means that you may have longer build times.

    • Lightmaps are handled differently when this code path is enabled, we use TextureArrays with a dynamic index in the shader to look up the lightmap to use. This will lead to increased GPU memory use for lightmaps when this feature is enabled. We are investigating how to improve this.
    How Can I Provide Feedback
    The best way to provide feedback is in this thread. Try this feature on your projects and report and issues or performance numbers here. If there are any bugs encountered or similar we’ll likely ask for a bug report but feel free to post here first.
     
  2. mgear

    mgear

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    tried in simple scene, maybe did something wrong?

    default URP
    upload_2023-10-6_14-19-55.png
    ,

    GPU Resident Drawer (with recommended settings)
    upload_2023-10-6_14-20-32.png
     
    flyer19 likes this.
  3. Tim-C

    Tim-C

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    Can you share the scene or details? Seems like you are hitting a path where you can save like 17k draw calls (massive amount) with dynamic or static batching. Static batching still works with GPU driven so maybe using a combination of both would be good in your use case?

    Either way would love the scene to assess where the delta is in your use case.
     
  4. mgear

    mgear

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    made some more tests, i think srp batcher was not enabled earlier.

    upload_2023-10-6_14-50-16.png
    ---
    upload_2023-10-6_14-50-35.png
    --
    ** best results **
    upload_2023-10-6_14-50-47.png
    ---
    upload_2023-10-6_14-50-56.png


    private cad model, so cannot share.. but if i get similar results on public models, i'll post.
    upload_2023-10-6_14-52-58.png
     
  5. Tim-C

    Tim-C

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    Ahhhhhh ohh yeah.

    This system in general improves the performance of rendering (i.e comparing the exact same set up off vs on) but you will only really see big benefits when there is lots of instancing (kitbash designed worlds work well for this).

    From the post:
    Cad models are a case where there is generally no instancing and a lot of unique meshes... this means they are still going to be individual draw calls per mesh. Static batching here will generally always be a good path as it will merge small meshes and reduce the amount of draws to the GPU.

    Resident drawer + static batching is good for your case as you get the benefits of the mesh combination as well as the faster backend drawing. So it's great to see that. In general the CAD model type cases are not the primary beneficiary of speedups here. We'll hopefully have something more for this case in the future ;)
     
  6. Reanimate_L

    Reanimate_L

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    Specific cases that are not compatible:
    • The renderer is affecting or is affected by real time global illumination
    As in Enlighten, or APV?
     
  7. Tim-C

    Tim-C

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    Enlighten will not work. APV should work and we did validation on this.
     
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  8. Reanimate_L

    Reanimate_L

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    Ah gotcha, so APV are fine then
     
  9. Kabinet13

    Kabinet13

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    This is really exciting! Haven't tested yet, but the initial numbers sound amazing. I noticed the github commit for this change was called "GPU Driven Rendering - Tier 0" Does that imply more is in the works?

    CPU performance has always been a bit of a pain in the SRPs, but this, and the upcoming CoreCLR migration is going to do wonders. Only thing I'm worried about is the increased shader variants, and more specifically, how much slower build times are going to be. (Unity needs a major shader compilation rework with the way it's going)
     
  10. aras-p

    aras-p

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    This is very exciting! Good stuff.

    Given that this is "tier 0" and much of groundwork for being "more fully GPU driven", I now hope this will move to, well, being more GPU driven - GPU culling, GPU occlusion culling, meshlets, you know all that jazz. Eventually. Still, very good foundational piece!

    Nice work everyone.
     
  11. Reanimate_L

    Reanimate_L

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    @Tim-C did you guys manage to test this with HDRP terrain demo project? i didn't get any performance improvement with it
     
  12. TheCelt

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    If you have fallbacks built in - why not just have it enabled by default, can't imagine most people will even be aware of this feature if its buried in the settings by a checkbox.
     
  13. Walter_Hulsebos

    Walter_Hulsebos

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  14. Tim-C

    Tim-C

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    When we have confidence that it's working properly for people we will do this. There are some thing though called out in the post that make it a bit difficult to turn it on always:
    • More shader variants
    • Potentially slower on GPU for lower tier mobiles
    We want to be careful. Likely it will become always on in HDRP.

    This project is using terrain instances and speed trees rather than mesh renderers. This is currently not supported via the fast path but is something we are working to add.

    We will be continuing to improve this area of Unity ;)

    Thanks Aras, hope you are well! We're hoping to have a number of the things you describe added to the rendering layer.
     
  15. TJHeuvel-net

    TJHeuvel-net

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    Super interesting development! We've been investigating developing this using the Graphics.RenderMeshIndirect api, but its great to see this builtin. Ill definitely try to share some of our results.

    Reading the commit (https://github.com/Unity-Technologi...43245be74c2607dd1dd58aab21fc03ad?diff=unified) im a bit confused. Is it the case that now GameObject rendering can use BatchRendererGroup, and secondly that brg can be done gpu driven/indirect?
    Does this mean dots rendering gets this too of the box?


    Cant wait to learn what the other tiers are too!
     
    Last edited: Oct 7, 2023
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  16. Reanimate_L

    Reanimate_L

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    Ahh so i just test it on the worst case project then , gotcha
     
  17. Tim-C

    Tim-C

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    Give it a go with the hdrp spaceship project.
     
  18. Jack_Martison

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    @Tim-C Sounds great and thanks for article.

    Just a few questions:
    - Is this some kind of ECS approach? (something-something converting gameobjects)
    - What the difference between DrawMeshInstanced/Indirect?
    - If the best cases for ECS something dynamic, Resident Drawer for only static meshes, right? Then quite trivial question, how it will work with large forest landscapes (not 2-3 different types of trees, but 20-50)

    I'm HDRP main, I tested various scenarios with trees mainly, I'd say even with usual gameobject it holds really well, obviously it skyrockets with ECS objects
     
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  19. Walter_Hulsebos

    Walter_Hulsebos

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    ~~The errors I got from this setting don't log to the console, only the log seemingly.~~

    It mentions I've got a warning in the bottom bar of the editor:
    image.png
    The aforementioned warning not being visible in the Console
    image (1).png

    EDIT: I'm having this problem with all unity errors in this version, doesn't relate to this change. Please disregard.
     
    Last edited: Oct 15, 2023
  20. Tim-C

    Tim-C

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    We run a conversion process that captures the gameobject data and converts it to draws in the batch render group. It’s persistent between frames amd only executes when things change. It’s not ecs based.

    instanced issues draws, instances indirect issues draws that can be modified with a compute shader before being executed by the gpu. so you can essentially modify on the gpu what you render.

    Each tree type will be an instanced draw. Speed tree and terrain support is still coming to the system though. If they are standard mesh renderers it will be fine though.
     
    Kabinet13 likes this.
  21. Tim-C

    Tim-C

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    Can you check the editor log?
     
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  22. optimise

    optimise

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    Hi. Does dots mobile project that using entities graphics will also benefit from this new GPU Driven Rendering feature?
     
  23. Tim-C

    Tim-C

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    They will not. Entities graphics is already going via this rendering pathway (batch renderer group) so already has the benefits.
     
    meeth_ and optimise like this.
  24. Reanimate_L

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    Not sure what happened here to be honest :confused:
    Also the ARUI Grid Map VFX are broken here, everytime camera looking at the map the fps just dipped to single digit. . .

    ON
    Kf50TcAtFM.png

    OFF
    Unity_WuM8bjnBHs.png
     
  25. Tim-C

    Tim-C

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    This is so fast on the cpu for you that there is barely any difference before and after. Guessing you have a very powerful pc?
     
  26. Reanimate_L

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    I guess so....... i'm on Ryzen 7 5800x but it seems i'm GPU bound as i have to reduce the scaling to 80% to get stable 60+ fps, well except when looking at the map
     
  27. Tim-C

    Tim-C

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    Yep the cpu time is tiiiny on your pc so gpu bound makes sense
     
  28. optimise

    optimise

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    Seems like currently official needs to create another different solution to support game object land. For the long term future improvement, I would like official to consolidate dots and game object land solutions into one to reduce maintenance cost significantly. The solution to achieve it is to change game object rendering part to use entities graphics that everything at game object is still work exactly the same like before. So basically the rendering part become entities and game objects syncs transform to entities under the hood . But before that I think official needs to merge RenderPipelineManager.DoRenderLoop_Internal() into entities graphics to remove the duplicated rendering logic and also burst rendering logic as much as possible. The last step is to completely remove built-in rendering pipeline since entities graphics not support built-in meaning that needs to make sure entities graphcis + urp performance is similar to or better than built-in.
     
  29. Tim-C

    Tim-C

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    Yep so this puts gameobjects through the batch render group path. We render via instanced draws in this first milestone. In the future we will be using indirect and other approaches.
     
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  30. TJHeuvel-net

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    We've recently been experimenting with HDRP for our game (Isonzo, online fps) and have 'upgraded' one level. Esp now also trying out the alpha, its fairly broken, but plenty of objects render anyway.

    Without the GPU resident drawer we seem to be hovering at 10.5ms CPU time, 9ms renderthread upload_2023-10-10_12-26-24.png

    With it enabled this drops to 9ms cpu, and 7.5 renderthread. For a gain in ~20fps.

    upload_2023-10-10_12-26-38.png

    This is on my fairly high spec machine, cant test on consoles because that version of the editor isnt out yet. Also note that this was in editor, but with C# set to release mode, burst to force sync compilation.

    Either way, we're excited and cant wait to use this! We'd love to share our project, if you are in need of a large test case
     
    Last edited: Oct 10, 2023
  31. Tim-C

    Tim-C

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    When you get either the project or a representative level (content only) upgraded to 23.3 we'd love to do some internal testing on it - upgrading the project on our side might be too a bit difficult for us though.

    Really happy to hear the gains you are getting!
     
  32. optimise

    optimise

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    For indirect, do u mean the parameters to the draw calls are stored in GPU memory that most of draw call work now can directly done at GPU and reduce CPU works massively?
     
  33. slime73

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    This is an exciting feature - I'm eager to see how it evolves and expands over the next while!

    Does the new system work with Unity's built-in texture mipmap streaming capabilities? I didn't see it mentioned anywhere.
     
  34. Tim-C

    Tim-C

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    We have to do some fixes to the lightmapping side of it to make that work (happening right now), but apart from that it should work exactly the same.
     
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  35. Tim-C

    Tim-C

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    We still do frustum culling on the CPU then it's possible to inject a compute shader to cull further (for example do gpu occlusion). Frustum culling on the CPU is still beneficial as if you do GPU frustum culling it's possible you end up with A LOT of empty draw calls (post gpu frustum culling) which takes time to submit. There is always some submit step needed from the CPU and keeping that small is still a good idea.
     
  36. Walter_Hulsebos

    Walter_Hulsebos

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    Sorry about the delayed response, it's not specific to this option, it was just the first time I'd seen it.
    It's a bug I'm having with that Unity version in general, I'll be making a proper bug report via the normal channels.
     
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  37. Tim-C

    Tim-C

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    Thanks :)
     
  38. retired_unity_saga

    retired_unity_saga

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    hello, i am achieving outstanding results with this over my previous benchmarks outside of this renderer modification (also, editor just seems to preform 10x better in this alpha than other 2023 versions, making me miserable in versions < 2023.3 alpha.),

    I had a couple questions:

    1. does this work with all shader graph shaders? Or is there something I must do to make them work with this?

    2. my movement test was abysmal as expected(and rightfully so since that was just CPU, and had nothing to do with renderer) as it was not burstified, or utilizing ECS, or any entity component system(or occlusion culling), however, this is easily rectified, but my question is now, can I simply use regular game instanced object when using ECS code should I need them moving?
    This new render pipeline option seems to permit this workflow now? My hybrid objects instanced mesh containing objects will just gain a boost from this system + being able to utilize ECS code? So I still need a sub-scene or no.
     
  39. Reanimate_L

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  40. Tim-C

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    I'm happy to hear this is working well for you :)

    It will work with any shaders that are Entities rendering / BRG compatible. Out of the box that should be the vast majority (I think it's actually all standard 'used on a mesh renderer types, but don't want to be wrong by claiming that as fact).

    This depends on what you want to do tbh and would take more knowledge than I have about your project. What I can say is that if you want to do everything via ECS but copy transform data back to game objects.... it will work. I just don't know how fast that would be. In the end this is a game object based rendering system - if you can get the data to the game object it will render. The system doesn't care how it gets to the game object.
     
  41. Tim-C

    Tim-C

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    Yep. This is a fully integrated and supported rendering pathway that works with all expected unity features (lightmapping, lightprobes, URP, HDRP, etc ect). There are some similarities between this and the BRG demo (as this also uses BRG under the hood) but they are quite different in the scope of what they can do. One is a 'demo of how to use an api' the other is a fully functional end to end usage of that API.

    In terms of performance: The brg-shooter is raw API usage with no additional 'stuff' so it can be slightly faster. This is the case when you are using an api for one specific use case vs writing for a larger scale general case.
     
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  42. Reanimate_L

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    Ah i see, Thanks for the answer
     
  43. laurentlavigne

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    That's the spirit! Love it and glad you're on this!
    Current production capped at 2020.1.17, I'll convert to 2023 this proto of procedural game that makes use of heavy GPU instancing and report.
     
    Last edited: Apr 21, 2024
  44. Crazy34

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    According to my tests, I can say that it is the most effective and useful optimisation for Unity in recent years. We have missed seeing this kind of work.

    I haven't had the opportunity to try it with RTX, but I wonder what the flexibility is in this regard? Also, what is the working situation with MaterialProperty?
     
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  45. joshcamas

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    This is great news! Glad to see game objects gaining performance.

    One additional future feature that could be really useful is being able to rely on the static flag to make objects not need to update their position every frame.
     
  46. punk

    punk

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    @Tim-C First test worked like a charm for me I have some large open spaces like below, that are usually a lot work to optimize, tested with the new feature on an unoptimized scene and it chopped 17k draw calls down to about 600. In fact for me its outperforming my usual work flows and I didn't have to do anything, pretty nuts - great work

    4. Grimstead - Slums.png
     
  47. Reanimate_L

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    Whoa that's an insane difference
     
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  48. punk

    punk

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    that's what I thought :D
     
  49. jiraphatK

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    Damn it. I now need to try porting the project to 2023 alpha on the weekend to test this :eek:
     
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  50. punk

    punk

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    its worth a look, but I'm gonna wait it in LTS or tech release to use it, something to look forward to ;)