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Third Party Issue
Votes
0
Found in
2019.4
2020.3
2020.3.19f1
2021.1
2021.2
2022.1
Issue ID
1368661
Regression
No
Compute shader cannot compile when using "for loops" on a 2D static array with 255 or more rows
Reproduction steps:
1. Open project "ComputeShaderLoop"
2. If you don't immediately see the errors, open Scripts/MeshGenerator and click "Show compiled code" in the Inspector
Expected result: No errors are shown and the script compiles
Actual result: These errors are shown and the script doesn't compile:
"Shader Compiler IPC Exception: Terminating shader compiler process"
"Shader compiler: Compile MeshGenerator.compute - MarchingCubes: Internal error communicating with the shader compiler process. Please report a bug including this shader and the editor log."
"Shader error in 'MeshGenerator': Compiling MarchingCubes: Internal error communicating with the shader compiler process. Please report a bug including this shader and the editor log."
Reproducible with: 2019.4.31f1, 2020.3.20f1, 2021.1.24f1, 2021.2.0b15, 2022.1.0a13
Notes:
- In the "MeshGenerator" script when uncommenting lines 316-328 and commenting out the "for loop", the bug is not reproducible
- If the row length of the "triTable" array is 254 or lower, the bug is not reproducible
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Resolution Note:
This is related to the limit on the size of a constant buffer (65536 bytes). If the sum of sizes of all uniform variables that are declared outside of a constant buffer (and end up in the implicit global constant buffer) exceeds 64KB, the MS D3D11 compiler (FXC) crashes. We haven't found a workaround for this, nor have a reasonable way to detect this before feeding to the compiler.