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@@ -61,11 +61,11 @@ static inline Direction ReverseDir(Direc
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/**
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* Calculate the difference between to directions
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* Calculate the difference between two directions
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*
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* @param d0 The first direction as the base
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* @param d1 The second direction as the offset from the base
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* @return The difference how the second directions drifts of the first one.
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* @return The difference how the second direction drifts of the first one.
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*/
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static inline DirDiff DirDifference(Direction d0, Direction d1)
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{
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@@ -79,7 +79,7 @@ static inline DirDiff DirDifference(Dire
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/**
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* Applies two differences together
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*
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* This function adds two differences together and return the resulting
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* This function adds two differences together and returns the resulting
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* difference. So adding two DIRDIFF_REVERSE together results in the
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* DIRDIFF_SAME difference.
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*
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@@ -123,6 +123,20 @@ static inline DiagDirection ReverseDiagD
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return (DiagDirection)(2 ^ d);
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}
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/**
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* Calculate the difference between two DiagDirection values
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*
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* @param d0 The first direction as the base
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* @param d1 The second direction as the offset from the base
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* @return The difference how the second direction drifts of the first one.
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*/
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static inline DiagDirDiff DiagDirDifference(DiagDirection d0, DiagDirection d1)
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{
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assert(IsValidDiagDirection(d0));
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assert(IsValidDiagDirection(d1));
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/* Cast to uint so compiler can use bitmask. Result can never be negative. */
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return (DiagDirDiff)((uint)(d0 - d1) % 4);
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}
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/**
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* Applies a difference on a DiagDirection
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