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Question GraphicsBuffer will break SRP Batch?

Discussion in 'Universal Render Pipeline' started by windsoulstar, Feb 29, 2024.

  1. windsoulstar


    May 13, 2018
    Scene environment: The empty scene only have one mesh.
    I have a mesh with 10 submesh, and it have 10 materials with same shader variant, I want to send float array to shader,when i use material.SetFloatArray,it work normally with srp batch, as a result, the mesh use 1 setpass call.
    But the float array is exactly same for 10 materials, so I want to optimize the I/O from cpu to gpu. I try to use GraphicsBuffer to optimize the I/O and use material.SetBuffer api,from Frame Debugger, I see that the 10 materials break SRP Batch and the Batch Cause is "SRP:This material has custom buffer override". as a result, the mesh use 10 setpass call.
    the question: it is intended that custom buffer will break srp, or it is just a bug?
    my unity version is 2022.3.20f1. develop and test in windows
  2. aleksandrk


    Unity Technologies

    Jul 3, 2017
    Yes, it will break a batch.