pub fn average_cached_z3(depths: [u16; 3]) -> u16Expand description
Reload three cached projected depths into the GTE SZ FIFO and compute OTZ.
This is the indexed-mesh counterpart to average_z_triangle. It keeps
cached vertex projection while using the PS1’s AVSZ3 unit instead of a
software 64-bit multiply for every face. The configured ZSF3 weight is
read from GTE control register 29.