# slope_func.h

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    00001 /* $Id: slope_func.h 13499 2008-06-12 21:36:56Z frosch $ */
    00002
    00005 #ifndef SLOPE_FUNC_H
    00006 #define SLOPE_FUNC_H
    00007
    00008 #include "core/math_func.hpp"
    00009 #include "slope_type.h"
    00010 #include "direction_type.h"
    00011 #include "tile_type.h"
    00012
    00019 static inline bool IsValidCorner(Corner corner)
    00020 {
    00021   return IsInsideMM(corner, 0, CORNER_END);
    00022 }
    00023
    00024
    00031 static inline bool IsSteepSlope(Slope s)
    00032 {
    00033   return (s & SLOPE_STEEP) != 0;
    00034 }
    00035
    00042 static inline bool IsHalftileSlope(Slope s)
    00043 {
    00044   return (s & SLOPE_HALFTILE) != 0;
    00045 }
    00046
    00055 static inline Slope RemoveHalftileSlope(Slope s)
    00056 {
    00057   return s & ~SLOPE_HALFTILE_MASK;
    00058 }
    00059
    00071 static inline Slope ComplementSlope(Slope s)
    00072 {
    00073   assert(!IsSteepSlope(s) && !IsHalftileSlope(s));
    00074   return s ^ SLOPE_ELEVATED;
    00075 }
    00076
    00083 static inline bool IsSlopeWithOneCornerRaised(Slope s)
    00084 {
    00085   return (s == SLOPE_W) || (s == SLOPE_S) || (s == SLOPE_E) || (s == SLOPE_N);
    00086 }
    00087
    00094 static inline Slope SlopeWithOneCornerRaised(Corner corner)
    00095 {
    00096   assert(IsValidCorner(corner));
    00097   return (Slope)(1 << corner);
    00098 }
    00099
    00108 static inline bool HasSlopeHighestCorner(Slope s)
    00109 {
    00110   s = RemoveHalftileSlope(s);
    00111   return IsSteepSlope(s) || IsSlopeWithOneCornerRaised(s);
    00112 }
    00113
    00121 static inline Corner GetHighestSlopeCorner(Slope s)
    00122 {
    00123   switch (RemoveHalftileSlope(s)) {
    00124     case SLOPE_W:
    00125     case SLOPE_STEEP_W: return CORNER_W;
    00126     case SLOPE_S:
    00127     case SLOPE_STEEP_S: return CORNER_S;
    00128     case SLOPE_E:
    00129     case SLOPE_STEEP_E: return CORNER_E;
    00130     case SLOPE_N:
    00131     case SLOPE_STEEP_N: return CORNER_N;
    00132     default: NOT_REACHED();
    00133   }
    00134 }
    00135
    00143 static inline Corner GetHalftileSlopeCorner(Slope s)
    00144 {
    00145   assert(IsHalftileSlope(s));
    00146   return (Corner)((s >> 6) & 3);
    00147 }
    00148
    00155 static inline uint GetSlopeMaxZ(Slope s)
    00156 {
    00157   if (s == SLOPE_FLAT) return 0;
    00158   if (IsSteepSlope(s)) return 2 * TILE_HEIGHT;
    00159   return TILE_HEIGHT;
    00160 }
    00161
    00168 static inline Corner OppositeCorner(Corner corner)
    00169 {
    00170   return (Corner)(corner ^ 2);
    00171 }
    00172
    00179 static inline bool IsSlopeWithThreeCornersRaised(Slope s)
    00180 {
    00181   return !IsHalftileSlope(s) && !IsSteepSlope(s) && IsSlopeWithOneCornerRaised(ComplementSlope(s));
    00182 }
    00183
    00190 static inline Slope SlopeWithThreeCornersRaised(Corner corner)
    00191 {
    00192   return ComplementSlope(SlopeWithOneCornerRaised(corner));
    00193 }
    00194
    00201 static inline Slope SteepSlope(Corner corner)
    00202 {
    00203   return SLOPE_STEEP | SlopeWithThreeCornersRaised(OppositeCorner(corner));
    00204 }
    00205
    00212 static inline bool IsInclinedSlope(Slope s)
    00213 {
    00214   return (s == SLOPE_NW) || (s == SLOPE_SW) || (s == SLOPE_SE) || (s == SLOPE_NE);
    00215 }
    00216
    00223 static inline DiagDirection GetInclinedSlopeDirection(Slope s)
    00224 {
    00225   switch (s) {
    00226     case SLOPE_NE: return DIAGDIR_NE;
    00227     case SLOPE_SE: return DIAGDIR_SE;
    00228     case SLOPE_SW: return DIAGDIR_SW;
    00229     case SLOPE_NW: return DIAGDIR_NW;
    00230     default: return INVALID_DIAGDIR;
    00231   }
    00232 }
    00233
    00240 static inline Slope InclinedSlope(DiagDirection dir)
    00241 {
    00242   switch (dir) {
    00243     case DIAGDIR_NE: return SLOPE_NE;
    00244     case DIAGDIR_SE: return SLOPE_SE;
    00245     case DIAGDIR_SW: return SLOPE_SW;
    00246     case DIAGDIR_NW: return SLOPE_NW;
    00247     default: NOT_REACHED();
    00248   }
    00249 }
    00250
    00258 static inline Slope HalftileSlope(Slope s, Corner corner)
    00259 {
    00260   assert(IsValidCorner(corner));
    00261   return (Slope)(s | SLOPE_HALFTILE | (corner << 6));
    00262 }
    00263
    00264
    00271 static inline bool IsFoundation(Foundation f)
    00272 {
    00273   return f != FOUNDATION_NONE;
    00274 }
    00275
    00282 static inline bool IsLeveledFoundation(Foundation f)
    00283 {
    00284   return f == FOUNDATION_LEVELED;
    00285 }
    00286
    00293 static inline bool IsInclinedFoundation(Foundation f)
    00294 {
    00295   return (f == FOUNDATION_INCLINED_X) || (f == FOUNDATION_INCLINED_Y);
    00296 }
    00297
    00304 static inline bool IsNonContinuousFoundation(Foundation f)
    00305 {
    00306   return IsInsideMM(f, FOUNDATION_STEEP_BOTH, FOUNDATION_HALFTILE_N + 1);
    00307 }
    00308
    00317 static inline Corner GetHalftileFoundationCorner(Foundation f)
    00318 {
    00319   assert(IsInsideMM(f, FOUNDATION_HALFTILE_W, FOUNDATION_HALFTILE_N + 1));
    00320   return (Corner)(f - FOUNDATION_HALFTILE_W);
    00321 }
    00322
    00329 static inline bool IsSpecialRailFoundation(Foundation f)
    00330 {
    00331   return IsInsideMM(f, FOUNDATION_RAIL_W, FOUNDATION_RAIL_N + 1);
    00332 }
    00333
    00340 static inline Corner GetRailFoundationCorner(Foundation f)
    00341 {
    00342   assert(IsSpecialRailFoundation(f));
    00343   return (Corner)(f - FOUNDATION_RAIL_W);
    00344 }
    00345
    00353 static inline Foundation FlatteningFoundation(Slope s)
    00354 {
    00355   return (s == SLOPE_FLAT ? FOUNDATION_NONE : FOUNDATION_LEVELED);
    00356 }
    00357
    00364 static inline Foundation InclinedFoundation(Axis axis)
    00365 {
    00366   return (axis == AXIS_X ? FOUNDATION_INCLINED_X : FOUNDATION_INCLINED_Y);
    00367 }
    00368
    00375 static inline Foundation HalftileFoundation(Corner corner)
    00376 {
    00377   assert(IsValidCorner(corner));
    00378   return (Foundation)(FOUNDATION_HALFTILE_W + corner);
    00379 }
    00380
    00387 static inline Foundation SpecialRailFoundation(Corner corner)
    00388 {
    00389   assert(IsValidCorner(corner));
    00390   return (Foundation)(FOUNDATION_RAIL_W + corner);
    00391 }
    00392
    00393 #endif /* SLOPE_FUNC_H */