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(svn r20127) -Fix [FS#3929]: Replace 'invalid engine' with 'vehicle model'.
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r8108:1d5bdeea7e20 r8108:1d5bdeea7e20 r8108:1d5bdeea7e20 r8108:1d5bdeea7e20 r8108:1d5bdeea7e20 r8108:1d5bdeea7e20 r8108:1d5bdeea7e20 r8108:1d5bdeea7e20 r8108:1d5bdeea7e20 r8108:1d5bdeea7e20 | /* $Id$ */
/*
* This file is part of OpenTTD.
* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file slope_func.h Functions related to slopes. */
#ifndef SLOPE_FUNC_H
#define SLOPE_FUNC_H
#include "core/math_func.hpp"
#include "slope_type.h"
#include "direction_type.h"
#include "tile_type.h"
/**
* Rangecheck for Corner enumeration.
*
* @param corner A #Corner.
* @return true iff corner is in a valid range.
*/
static inline bool IsValidCorner(Corner corner)
{
return IsInsideMM(corner, 0, CORNER_END);
}
/**
* Checks if a slope is steep.
*
* @param s The given #Slope.
* @return True if the slope is steep, else false.
*/
static inline bool IsSteepSlope(Slope s)
{
return (s & SLOPE_STEEP) != 0;
}
/**
* Checks for non-continuous slope on halftile foundations.
*
* @param s The given #Slope.
* @return True if the slope is non-continuous, else false.
*/
static inline bool IsHalftileSlope(Slope s)
{
return (s & SLOPE_HALFTILE) != 0;
}
/**
* Removes a halftile slope from a slope
*
* Non-halftile slopes remain unmodified.
*
* @param s A #Slope.
* @return The slope s without its halftile slope.
*/
static inline Slope RemoveHalftileSlope(Slope s)
{
return s & ~SLOPE_HALFTILE_MASK;
}
/**
* Return the complement of a slope.
*
* This method returns the complement of a slope. The complement of a
* slope is a slope with raised corner which aren't raised in the given
* slope.
*
* @pre The slope must neither be steep nor a halftile slope.
* @param s The #Slope to get the complement.
* @return a complement Slope of the given slope.
*/
static inline Slope ComplementSlope(Slope s)
{
assert(!IsSteepSlope(s) && !IsHalftileSlope(s));
return s ^ SLOPE_ELEVATED;
}
/**
* Tests if a specific slope has exactly one corner raised.
*
* @param s The #Slope
* @return true iff exactly one corner is raised
*/
static inline bool IsSlopeWithOneCornerRaised(Slope s)
{
return (s == SLOPE_W) || (s == SLOPE_S) || (s == SLOPE_E) || (s == SLOPE_N);
}
/**
* Returns the slope with a specific corner raised.
*
* @param corner The #Corner.
* @return The #Slope with corner "corner" raised.
*/
static inline Slope SlopeWithOneCornerRaised(Corner corner)
{
assert(IsValidCorner(corner));
return (Slope)(1 << corner);
}
/**
* Tests if a slope has a highest corner (i.e. one corner raised or a steep slope).
*
* Note: A halftile slope is ignored.
*
* @param s The #Slope.
* @return true iff the slope has a highest corner.
*/
static inline bool HasSlopeHighestCorner(Slope s)
{
s = RemoveHalftileSlope(s);
return IsSteepSlope(s) || IsSlopeWithOneCornerRaised(s);
}
/**
* Returns the highest corner of a slope (one corner raised or a steep slope).
*
* @pre The slope must be a slope with one corner raised or a steep slope. A halftile slope is ignored.
* @param s The #Slope.
* @return Highest corner.
*/
static inline Corner GetHighestSlopeCorner(Slope s)
{
switch (RemoveHalftileSlope(s)) {
case SLOPE_W:
case SLOPE_STEEP_W: return CORNER_W;
case SLOPE_S:
case SLOPE_STEEP_S: return CORNER_S;
case SLOPE_E:
case SLOPE_STEEP_E: return CORNER_E;
case SLOPE_N:
case SLOPE_STEEP_N: return CORNER_N;
default: NOT_REACHED();
}
}
/**
* Returns the leveled halftile of a halftile slope.
*
* @pre The slope must be a halftile slope.
* @param s The #Slope.
* @return The corner of the leveled halftile.
*/
static inline Corner GetHalftileSlopeCorner(Slope s)
{
assert(IsHalftileSlope(s));
return (Corner)((s >> 6) & 3);
}
/**
* Returns the height of the highest corner of a slope relative to TileZ (= minimal height)
*
* @param s The #Slope.
* @return Relative height of highest corner.
*/
static inline uint GetSlopeMaxZ(Slope s)
{
if (s == SLOPE_FLAT) return 0;
if (IsSteepSlope(s)) return 2 * TILE_HEIGHT;
return TILE_HEIGHT;
}
/**
* Returns the opposite corner.
*
* @param corner A #Corner.
* @return The opposite corner to "corner".
*/
static inline Corner OppositeCorner(Corner corner)
{
return (Corner)(corner ^ 2);
}
/**
* Tests if a specific slope has exactly three corners raised.
*
* @param s The #Slope
* @return true iff exactly three corners are raised
*/
static inline bool IsSlopeWithThreeCornersRaised(Slope s)
{
return !IsHalftileSlope(s) && !IsSteepSlope(s) && IsSlopeWithOneCornerRaised(ComplementSlope(s));
}
/**
* Returns the slope with all except one corner raised.
*
* @param corner The #Corner.
* @return The #Slope with all corners but "corner" raised.
*/
static inline Slope SlopeWithThreeCornersRaised(Corner corner)
{
return ComplementSlope(SlopeWithOneCornerRaised(corner));
}
/**
* Returns a specific steep slope
*
* @param corner A #Corner.
* @return The steep #Slope with "corner" as highest corner.
*/
static inline Slope SteepSlope(Corner corner)
{
return SLOPE_STEEP | SlopeWithThreeCornersRaised(OppositeCorner(corner));
}
/**
* Tests if a specific slope is an inclined slope.
*
* @param s The #Slope
* @return true iff the slope is inclined.
*/
static inline bool IsInclinedSlope(Slope s)
{
return (s == SLOPE_NW) || (s == SLOPE_SW) || (s == SLOPE_SE) || (s == SLOPE_NE);
}
/**
* Returns the direction of an inclined slope.
*
* @param s A #Slope
* @return The direction the slope goes up in. Or INVALID_DIAGDIR if the slope is not an inclined slope.
*/
static inline DiagDirection GetInclinedSlopeDirection(Slope s)
{
switch (s) {
case SLOPE_NE: return DIAGDIR_NE;
case SLOPE_SE: return DIAGDIR_SE;
case SLOPE_SW: return DIAGDIR_SW;
case SLOPE_NW: return DIAGDIR_NW;
default: return INVALID_DIAGDIR;
}
}
/**
* Returns the slope, that is inclined in a specific direction.
*
* @param dir A #DiagDirection
* @return The #Slope that goes up in direction dir.
*/
static inline Slope InclinedSlope(DiagDirection dir)
{
switch (dir) {
case DIAGDIR_NE: return SLOPE_NE;
case DIAGDIR_SE: return SLOPE_SE;
case DIAGDIR_SW: return SLOPE_SW;
case DIAGDIR_NW: return SLOPE_NW;
default: NOT_REACHED();
}
}
/**
* Adds a halftile slope to a slope.
*
* @param s #Slope without a halftile slope.
* @param corner The #Corner of the halftile.
* @return The #Slope s with the halftile slope added.
*/
static inline Slope HalftileSlope(Slope s, Corner corner)
{
assert(IsValidCorner(corner));
return (Slope)(s | SLOPE_HALFTILE | (corner << 6));
}
/**
* Tests for FOUNDATION_NONE.
*
* @param f Maybe a #Foundation.
* @return true iff f is a foundation.
*/
static inline bool IsFoundation(Foundation f)
{
return f != FOUNDATION_NONE;
}
/**
* Tests if the foundation is a leveled foundation.
*
* @param f The #Foundation.
* @return true iff f is a leveled foundation.
*/
static inline bool IsLeveledFoundation(Foundation f)
{
return f == FOUNDATION_LEVELED;
}
/**
* Tests if the foundation is an inclined foundation.
*
* @param f The #Foundation.
* @return true iff f is an inclined foundation.
*/
static inline bool IsInclinedFoundation(Foundation f)
{
return (f == FOUNDATION_INCLINED_X) || (f == FOUNDATION_INCLINED_Y);
}
/**
* Tests if a foundation is a non-continuous foundation, i.e. halftile-foundation or FOUNDATION_STEEP_BOTH.
*
* @param f The #Foundation.
* @return true iff f is a non-continuous foundation
*/
static inline bool IsNonContinuousFoundation(Foundation f)
{
return IsInsideMM(f, FOUNDATION_STEEP_BOTH, FOUNDATION_HALFTILE_N + 1);
}
/**
* Returns the halftile corner of a halftile-foundation
*
* @pre f != FOUNDATION_STEEP_BOTH
*
* @param f The #Foundation.
* @return The #Corner with track.
*/
static inline Corner GetHalftileFoundationCorner(Foundation f)
{
assert(IsInsideMM(f, FOUNDATION_HALFTILE_W, FOUNDATION_HALFTILE_N + 1));
return (Corner)(f - FOUNDATION_HALFTILE_W);
}
/**
* Tests if a foundation is a special rail foundation for single horizontal/vertical track.
*
* @param f The #Foundation.
* @return true iff f is a special rail foundation for single horizontal/vertical track.
*/
static inline bool IsSpecialRailFoundation(Foundation f)
{
return IsInsideMM(f, FOUNDATION_RAIL_W, FOUNDATION_RAIL_N + 1);
}
/**
* Returns the track corner of a special rail foundation
*
* @param f The #Foundation.
* @return The #Corner with track.
*/
static inline Corner GetRailFoundationCorner(Foundation f)
{
assert(IsSpecialRailFoundation(f));
return (Corner)(f - FOUNDATION_RAIL_W);
}
/**
* Returns the foundation needed to flatten a slope.
* The returned foundation is either FOUNDATION_NONE if the tile was already flat, or FOUNDATION_LEVELED.
*
* @param s The current #Slope.
* @return The needed #Foundation.
*/
static inline Foundation FlatteningFoundation(Slope s)
{
return (s == SLOPE_FLAT ? FOUNDATION_NONE : FOUNDATION_LEVELED);
}
/**
* Returns the along a specific axis inclined foundation.
*
* @param axis The #Axis.
* @return The needed #Foundation.
*/
static inline Foundation InclinedFoundation(Axis axis)
{
return (axis == AXIS_X ? FOUNDATION_INCLINED_X : FOUNDATION_INCLINED_Y);
}
/**
* Returns the halftile foundation for single horizontal/vertical track.
*
* @param corner The #Corner with the track.
* @return The wanted #Foundation.
*/
static inline Foundation HalftileFoundation(Corner corner)
{
assert(IsValidCorner(corner));
return (Foundation)(FOUNDATION_HALFTILE_W + corner);
}
/**
* Returns the special rail foundation for single horizontal/vertical track.
*
* @param corner The #Corner with the track.
* @return The wanted #Foundation.
*/
static inline Foundation SpecialRailFoundation(Corner corner)
{
assert(IsValidCorner(corner));
return (Foundation)(FOUNDATION_RAIL_W + corner);
}
#endif /* SLOPE_FUNC_H */
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