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ShaderData.SubShader returns incorrect passCount for Lit shader

Discussion in 'Universal Render Pipeline' started by rainluna, Feb 21, 2022.

  1. rainluna

    rainluna

    Joined:
    Sep 3, 2021
    Posts:
    4
    upload_2022-2-21_19-29-25.png upload_2022-2-21_19-29-54.png
    Screenshots are from Unity 2020.2 URP 10.3.1. Lit shader source code has 7 passes in the first subShader and 5 passes in the second. The other result I get from the code above in Unity 2019.4 URP 7.4 is: upload_2022-2-21_20-0-30.png
    But in fact Lit shader has only 1 subShader and 5 passes :) like what the heck?
     
    rainluna, Feb 21, 2022
    #1

  2. rainluna

    rainluna

    Joined:
    Sep 3, 2021
    Posts:
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    fyi reply from https://twitter.com/Cyanilux in Unity's Official Discord channel:
    I'm not very familiar with the ShaderData stuff, It could very well be bugged. But it's also possible that it only counts SubShaders/Passes that are currently being used / compiled. If the scene isn't using them it might be stripped. Hence 6 and not the full 7. And in both versions the second subshader (with one pass) could be Fallback (magenta error shader).
     
    rainluna, Feb 21, 2022
    #2

  3. aleksandrk

    aleksandrk

    Unity Technologies

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    Jul 3, 2017
    Posts:
    2,864
    Hi!
    ShaderData reports what the runtime sees. The URP/Lit shader has two subshaders that include a different subset of graphics APIs (one excludes GL backends, another one includes only GL backends; you cannot have both at the same time) and a fallback. Fallback subshaders are also counted in there.
     
    aleksandrk, Feb 22, 2022
    #3

  4. rainluna

    rainluna

    Joined:
    Sep 3, 2021
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    Hey! Thanks for reply! I got it. Is there a way to check if subShader/pass is excluded for current platform?
     
    rainluna, Feb 22, 2022
    #4

  5. aleksandrk

    aleksandrk

    Unity Technologies

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    Jul 3, 2017
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    2,864
    I don't think there is currently.
     
    aleksandrk, Feb 22, 2022
    #5