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Codechange: make rounding code clearer 

-O1 already optimizes it to the original hand optimized magic code
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Rubidium 2023-01-26 22:59:32 +01:00 committed by rubidium42
parent 71b46db8d0
commit 755e41de9f
1 changed files with 3 additions and 1 deletions
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4
src/elrail.cpp
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@ -234,7 +234,9 @@ static int GetPCPElevation(TileIndex tile, DiagDirection PCPpos)
int z = GetSlopePixelZ(TileX(tile) * TILE_SIZE + std::min<int8>(x_pcp_offsets[PCPpos], TILE_SIZE - 1),
TileY(tile) * TILE_SIZE + std::min<int8>(y_pcp_offsets[PCPpos], TILE_SIZE - 1));
return (z + 2) & ~3; // this means z = (z + TILE_HEIGHT / 4) / (TILE_HEIGHT / 2) * (TILE_HEIGHT / 2);
/* Round the Z to the nearest half tile height. */
static const uint HALF_TILE_HEIGHT = TILE_HEIGHT / 2;
return (z + HALF_TILE_HEIGHT / 2) / HALF_TILE_HEIGHT * HALF_TILE_HEIGHT;
}
/**