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(svn r22960) -Feature: Allow depots, standard roadstops and airports on steep slopes.

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frosch
2011-09-25 13:35:17 +00:00
parent 035420f318
commit 1df095f114
6 changed files with 30 additions and 37 deletions
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15
src/depot_func.h
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@@ -26,19 +26,14 @@ void DeleteDepotHighlightOfVehicle(const Vehicle *v);
* @param direction The direction in which the depot's exit points
* @param tileh The slope of the tile in question
* @return true if the construction is possible
* This is checked by the ugly 0x4C >> direction magic, which does the following:
* 0x4C is 0100 1100 and tileh has only bits 0..3 set (steep tiles are ruled out)
* So: for direction (only the significant bits are shown)<p>
* 00 (exit towards NE) we need either bit 2 or 3 set in tileh: 0x4C >> 0 = 1100<p>
* 01 (exit towards SE) we need either bit 1 or 2 set in tileh: 0x4C >> 1 = 0110<p>
* 02 (exit towards SW) we need either bit 0 or 1 set in tileh: 0x4C >> 2 = 0011<p>
* 03 (exit towards NW) we need either bit 0 or 4 set in tileh: 0x4C >> 3 = 1001<p>
* So ((0x4C >> direction) & tileh) determines whether the depot can be built on the current tileh
*/
static inline bool CanBuildDepotByTileh(DiagDirection direction, Slope tileh)
{
return ((0x4C >> direction) & tileh) != 0;
assert(tileh != SLOPE_FLAT);
Slope entrance_corners = InclinedSlope(direction);
/* For steep slopes both entrance corners must be raised (i.e. neither of them is the lowest corner),
* For non-steep slopes at least one corner must be raised. */
return IsSteepSlope(tileh) ? (tileh & entrance_corners) == entrance_corners : (tileh & entrance_corners) != 0;
}
#endif /* DEPOT_FUNC_H */