IT_DISPATCH_DIRECT: a GPU compute dispatch. body = [dim_x, dim_y, dim_z, dispatch_initiator] (workgroup counts). The CS program addr, workgroup size, resource/RSRC and user-data come from the COMPUTE_* SH registers set before it. Doom64 builds its level texture atlases with these (the T# the 3D world samples is written by a CS), so without executing them the atlases stay zero/black.
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