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@ -8,6 +8,17 @@
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#ifndef SLOPE_H
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#define SLOPE_H
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/**
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* Enumeration of tile corners
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*/
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enum Corner {
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CORNER_W = 0,
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CORNER_S = 1,
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CORNER_E = 2,
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CORNER_N = 3,
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CORNER_END
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};
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/**
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* Enumeration for the slope-type.
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*
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@ -15,6 +26,14 @@
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* direction north, east, south and west. The top corner of a tile
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* is the north-part of the tile. The whole slope is encoded with
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* 5 bits, 4 bits for each corner and 1 bit for a steep-flag.
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*
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* For halftile slopes an extra 3 bits are used to represent this
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* properly; 1 bit for a halftile-flag and 2 bits to encode which
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* extra side (corner) is leveled when the slope of the first 5
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* bits is applied. This means that there can only be one leveled
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* slope for steep slopes, which is logical because two leveled
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* slopes would mean that it is not a steep slope as halftile
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* slopes only span one height level.
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*/
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enum Slope {
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SLOPE_FLAT = 0x00, ///< a flat tile
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@ -37,18 +56,14 @@ enum Slope {
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SLOPE_STEEP_W = SLOPE_STEEP | SLOPE_NWS, ///< a steep slope falling to east (from west)
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SLOPE_STEEP_S = SLOPE_STEEP | SLOPE_WSE, ///< a steep slope falling to north (from south)
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SLOPE_STEEP_E = SLOPE_STEEP | SLOPE_SEN, ///< a steep slope falling to west (from east)
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SLOPE_STEEP_N = SLOPE_STEEP | SLOPE_ENW ///< a steep slope falling to south (from north)
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};
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SLOPE_STEEP_N = SLOPE_STEEP | SLOPE_ENW, ///< a steep slope falling to south (from north)
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/**
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* Enumeration of tile corners
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*/
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enum Corner {
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CORNER_W = 0,
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CORNER_S = 1,
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CORNER_E = 2,
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CORNER_N = 3,
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CORNER_END
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SLOPE_HALFTILE = 0x20, ///< one halftile is leveled (non continuous slope)
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SLOPE_HALFTILE_MASK = 0xE0, ///< three bits used for halftile slopes
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SLOPE_HALFTILE_W = SLOPE_HALFTILE | (CORNER_W << 6), ///< the west halftile is leveled (non continuous slope)
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SLOPE_HALFTILE_S = SLOPE_HALFTILE | (CORNER_S << 6), ///< the south halftile is leveled (non continuous slope)
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SLOPE_HALFTILE_E = SLOPE_HALFTILE | (CORNER_E << 6), ///< the east halftile is leveled (non continuous slope)
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SLOPE_HALFTILE_N = SLOPE_HALFTILE | (CORNER_N << 6), ///< the north halftile is leveled (non continuous slope)
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};
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/**
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@ -73,6 +88,17 @@ static inline bool IsSteepSlope(Slope s)
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return (s & SLOPE_STEEP) != 0;
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}
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/**
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* Checks for non-continuous slope on halftile foundations.
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*
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* @param s The given #Slope.
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* @return True if the slope is non-continuous, else false.
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*/
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static inline bool IsHalftileSlope(Slope s)
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{
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return (s & SLOPE_HALFTILE) != 0;
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}
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/**
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* Return the complement of a slope.
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*
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@ -80,37 +106,40 @@ static inline bool IsSteepSlope(Slope s)
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* slope is a slope with raised corner which aren't raised in the given
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* slope.
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*
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* @pre The slope must not be steep.
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* @pre The slope must neither be steep nor a halftile slope.
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* @param s The #Slope to get the complement.
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* @return a complement Slope of the given slope.
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*/
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static inline Slope ComplementSlope(Slope s)
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{
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assert(!IsSteepSlope(s));
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assert(!IsSteepSlope(s) && !IsHalftileSlope(s));
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return (Slope)(0xF ^ s);
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}
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/**
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* Tests if a slope has a highest corner (i.e. one corner raised or a steep slope).
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*
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* Note: A halftile slope is ignored.
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*
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* @param s The #Slope.
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* @return true iff the slope has a highest corner.
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*/
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static inline bool HasSlopeHighestCorner(Slope s)
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{
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s = (Slope)(s & ~SLOPE_HALFTILE_MASK);
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return IsSteepSlope(s) || (s == SLOPE_W) || (s == SLOPE_S) || (s == SLOPE_E) || (s == SLOPE_N);
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}
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/**
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* Returns the highest corner of a slope (one corner raised or a steep slope).
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*
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* @pre The slope must be a slope with one corner raised or a steep slope.
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* @pre The slope must be a slope with one corner raised or a steep slope. A halftile slope is ignored.
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* @param s The #Slope.
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* @return Highest corner.
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*/
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static inline Corner GetHighestSlopeCorner(Slope s)
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{
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switch (s) {
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switch (s & ~SLOPE_HALFTILE_MASK) {
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case SLOPE_W:
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case SLOPE_STEEP_W: return CORNER_W;
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case SLOPE_S:
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@ -123,6 +152,19 @@ static inline Corner GetHighestSlopeCorner(Slope s)
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}
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}
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/**
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* Returns the leveled halftile of a halftile slope.
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*
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* @pre The slope must be a halftile slope.
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* @param s The #Slope.
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* @return The corner of the leveled halftile.
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*/
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static inline Corner GetHalftileSlopeCorner(Slope s)
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{
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assert(IsHalftileSlope(s));
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return (Corner)((s >> 6) & 3);
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}
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/**
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* Returns the height of the highest corner of a slope relative to TileZ (= minimal height)
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*
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@ -170,6 +212,19 @@ static inline Slope SlopeWithThreeCornersRaised(Corner corner)
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return ComplementSlope(SlopeWithOneCornerRaised(corner));
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}
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/**
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* Adds a halftile slope to a slope.
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*
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* @param s #Slope without a halftile slope.
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* @param corner The #Corner of the halftile.
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* @return The #Slope s with the halftile slope added.
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*/
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static inline Slope HalftileSlope(Slope s, Corner corner)
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{
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assert(IsValidCorner(corner));
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return (Slope)(s | SLOPE_HALFTILE | (corner << 6));
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}
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/**
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* Enumeration for Foundations.
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rubidium
17 years ago