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CopyTexture() throws an error when copying compressed Texture



How to reproduce:
1. Open the "SampleScene" in the attached project "case_1172610-Graphics_Bug"
2. Make sure that "copyTextureFailure" Texture in the project Assets folder is compressed
3. Press "Play"

Expected results: CopyTexture() will replace goblin's torso texture with compressed texture
Actual results: An error is thrown

Reproducible with: 2017.4.31f1, 2018.4.5f1, 2019.1.13f1, 2019.2.0f1, 2019.3.0a11

Additional notes:
1. It was tested using different graphics APIs. Here are the errors received:
DX11/DX12: "Graphics.CopyTexture can only copy between same texture format groups (d3d11/d3d12 base formats: src=76 dst=27)"
OpenGLCore: "Graphics.CopyTexture can only copy between same texture format groups (OpenGL internal formats: src=33779, blockSize=16 ; dst=32856,

Metal: Crash
OpenGLCore: Does not reproduce, works as expected without any errors
2. Compression quality does not affect the outcome

  1. Response avatar

    Resolution Note:

    GPUs can only copy texture within the same format groups. As a result, we throw an error if the user tries to use CopyTexture between textures which can't be copied to each other.

Comments (3)

  1. B36530eff44c377898b7fd8309cb6b05?d=mm


    Jan 10, 2020 01:59

    Yes I can confirm the same issue. Created two textures with exactly same format through Texture2D.CreateExternalTexture and I get DX11/DX12: "Graphics.CopyTexture can only copy between same texture format groups (d3d11/d3d12 base formats: src=76 dst=27)"

    Unity please look into this because the base formats its complaining are incompatible is incorrect.

    Version 2019.3.0f3

  2. C1add2ff230213b25de9d56e8f77b97b?d=mm


    Sep 07, 2019 15:13

    Ignore my previous comment, it was an asset bundle caching bug.

  3. C1add2ff230213b25de9d56e8f77b97b?d=mm


    Sep 07, 2019 15:09

    I've done some research and this happens even if the target and source texture share the same format group (even literally the exact same format).

    However, I noticed a different bug with certain textures. Setting the import property to readable did not matter. It would always appear as FALSE even if the read/write import property was set to true.

    Im wondering if this error message is "wrong" because there might be an underlying issue with the read/write property on certain textures? (This is pure speculation as I cannot step through the code but I can verify that the read/write property is false on textures I explicitly set to true).

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