I haven’t modified the four thread‑related functions yet, only the other functions. Currently there is a rendering issue and I’m troubleshooting. May I temporarily focus the investigation only on the other functions?
It depends on what problem your rendering result has. Generally, if the object’s shape is correct and only the shading is problematic, then it is unrelated to threads. If the shape is distorted, or unexpected holes appear, that may be related to the primitive assembly process (rasterization thread) or depth testing (fragment thread); looking only at other parts may not necessarily reveal the issue.