(svn r8033) [cpp] - Prepare for merge from branches/cpp (all .c files renamed to .cpp)

1 files changed, 0 insertions, 671 deletions

diff --git a/src/tree_cmd.c b/src/tree_cmd.c
deleted file mode 100644
index 47b9a4a37..000000000
--- a/src/tree_cmd.c
+++ /dev/null
@@ -1,671 +0,0 @@
-/* $Id$ */
-
-#include "stdafx.h"
-#include "openttd.h"
-#include "bridge_map.h"
-#include "clear_map.h"
-#include "table/strings.h"
-#include "table/sprites.h"
-#include "table/tree_land.h"
-#include "functions.h"
-#include "map.h"
-#include "tile.h"
-#include "tree_map.h"
-#include "viewport.h"
-#include "command.h"
-#include "town.h"
-#include "sound.h"
-#include "variables.h"
-#include "genworld.h"
-
-enum TreePlacer {
-	TP_NONE,
-	TP_ORIGINAL,
-	TP_IMPROVED,
-};
-
-static TreeType GetRandomTreeType(TileIndex tile, uint seed)
-{
-	switch (_opt.landscape) {
-		case LT_NORMAL:
-			return seed * TREE_COUNT_TEMPERATE / 256 + TREE_TEMPERATE;
-
-		case LT_HILLY:
-			return seed * TREE_COUNT_SUB_ARCTIC / 256 + TREE_SUB_ARCTIC;
-
-		case LT_DESERT:
-			switch (GetTropicZone(tile)) {
-				case TROPICZONE_INVALID: return seed * TREE_COUNT_SUB_TROPICAL / 256 + TREE_SUB_TROPICAL;
-				case TROPICZONE_DESERT:  return (seed > 12) ? TREE_INVALID : TREE_CACTUS;
-				default:                 return seed * TREE_COUNT_RAINFOREST / 256 + TREE_RAINFOREST;
-			}
-
-		default:
-			return seed * TREE_COUNT_TOYLAND / 256 + TREE_TOYLAND;
-	}
-}
-
-static void PlaceTree(TileIndex tile, uint32 r)
-{
-	TreeType tree = GetRandomTreeType(tile, GB(r, 24, 8));
-
-	if (tree != TREE_INVALID) {
-		MakeTree(tile, tree, GB(r, 22, 2), min(GB(r, 16, 3), 6), TREE_GROUND_GRASS, 0);
-
-		// above snowline?
-		if (_opt.landscape == LT_HILLY && GetTileZ(tile) > _opt.snow_line) {
-			SetTreeGroundDensity(tile, TREE_GROUND_SNOW_DESERT, 3);
-			SetTreeCounter(tile, GB(r, 24, 3));
-		} else {
-			SetTreeGroundDensity(tile, GB(r, 28, 1), 0);
-			SetTreeCounter(tile, GB(r, 24, 4));
-		}
-	}
-}
-
-static void DoPlaceMoreTrees(TileIndex tile)
-{
-	uint i;
-
-	for (i = 0; i < 1000; i++) {
-		uint32 r = Random();
-		int x = GB(r, 0, 5) - 16;
-		int y = GB(r, 8, 5) - 16;
-		uint dist = myabs(x) + myabs(y);
-		TileIndex cur_tile = TILE_MASK(tile + TileDiffXY(x, y));
-
-		if (dist <= 13 &&
-				IsTileType(cur_tile, MP_CLEAR) &&
-				!IsBridgeAbove(cur_tile) &&
-				!IsClearGround(cur_tile, CLEAR_FIELDS) &&
-				!IsClearGround(cur_tile, CLEAR_ROCKS)) {
-			PlaceTree(cur_tile, r);
-		}
-	}
-}
-
-static void PlaceMoreTrees(void)
-{
-	uint i = ScaleByMapSize(GB(Random(), 0, 5) + 25);
-	do {
-		DoPlaceMoreTrees(RandomTile());
-	} while (--i);
-}
-
-/**
- * Place a tree at the same height as an existing tree.
- *  This gives cool effects to the map.
- */
-void PlaceTreeAtSameHeight(TileIndex tile, uint height)
-{
-	uint i;
-
-	for (i = 0; i < 1000; i++) {
-		uint32 r = Random();
-		int x = GB(r, 0, 5) - 16;
-		int y = GB(r, 8, 5) - 16;
-		TileIndex cur_tile = TILE_MASK(tile + TileDiffXY(x, y));
-
-		/* Keep in range of the existing tree */
-		if (myabs(x) + myabs(y) > 16) continue;
-
-		/* Clear tile, no farm-tiles or rocks */
-		if (!IsTileType(cur_tile, MP_CLEAR) ||
-				IsClearGround(cur_tile, CLEAR_FIELDS) ||
-				IsClearGround(cur_tile, CLEAR_ROCKS))
-			continue;
-
-		/* Not too much height difference */
-		if (myabs(GetTileZ(cur_tile) - height) > 2) continue;
-
-		/* Place one tree and quit */
-		PlaceTree(cur_tile, r);
-		break;
-	}
-}
-
-void PlaceTreesRandomly(void)
-{
-	uint i, j, ht;
-
-	i = ScaleByMapSize(1000);
-	do {
-		uint32 r = Random();
-		TileIndex tile = RandomTileSeed(r);
-
-		IncreaseGeneratingWorldProgress(GWP_TREE);
-
-		if (IsTileType(tile, MP_CLEAR) &&
-				!IsBridgeAbove(tile) &&
-				!IsClearGround(tile, CLEAR_FIELDS) &&
-				!IsClearGround(tile, CLEAR_ROCKS)) {
-			PlaceTree(tile, r);
-			if (_patches.tree_placer != TP_IMPROVED) continue;
-
-			/* Place a number of trees based on the tile height.
-			 *  This gives a cool effect of multiple trees close together.
-			 *  It is almost real life ;) */
-			ht = GetTileZ(tile);
-			/* The higher we get, the more trees we plant */
-			j = GetTileZ(tile) / TILE_HEIGHT * 2;
-			while (j--) {
-				/* Above snowline more trees! */
-				if (_opt.landscape == LT_HILLY && ht > _opt.snow_line) {
-					PlaceTreeAtSameHeight(tile, ht);
-					PlaceTreeAtSameHeight(tile, ht);
-				};
-
-				PlaceTreeAtSameHeight(tile, ht);
-			}
-		}
-	} while (--i);
-
-	/* place extra trees at rainforest area */
-	if (_opt.landscape == LT_DESERT) {
-		i = ScaleByMapSize(15000);
-
-		do {
-			uint32 r = Random();
-			TileIndex tile = RandomTileSeed(r);
-
-			IncreaseGeneratingWorldProgress(GWP_TREE);
-
-			if (IsTileType(tile, MP_CLEAR) &&
-					!IsBridgeAbove(tile) &&
-					!IsClearGround(tile, CLEAR_FIELDS) &&
-					GetTropicZone(tile) == TROPICZONE_RAINFOREST) {
-				PlaceTree(tile, r);
-			}
-		} while (--i);
-	}
-}
-
-void GenerateTrees(void)
-{
-	uint i, total;
-
-	if (_patches.tree_placer == TP_NONE) return;
-
-	if (_opt.landscape != LT_CANDY) PlaceMoreTrees();
-
-	switch (_patches.tree_placer) {
-		case TP_ORIGINAL: i = _opt.landscape == LT_HILLY ? 15 : 6; break;
-		case TP_IMPROVED: i = _opt.landscape == LT_HILLY ?  4 : 2; break;
-		default: NOT_REACHED(); return;
-	}
-
-	total = ScaleByMapSize(1000);
-	if (_opt.landscape == LT_DESERT) total += ScaleByMapSize(15000);
-	total *= i;
-	SetGeneratingWorldProgress(GWP_TREE, total);
-
-	for (; i != 0; i--) {
-		PlaceTreesRandomly();
-	}
-}
-
-/** Plant a tree.
- * @param tile start tile of area-drag of tree plantation
- * @param p1 tree type, -1 means random.
- * @param p2 end tile of area-drag
- */
-int32 CmdPlantTree(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
-{
-	StringID msg = INVALID_STRING_ID;
-	int32 cost;
-	int ex;
-	int ey;
-	int sx, sy, x, y;
-
-	if (p2 >= MapSize()) return CMD_ERROR;
-	/* Check the tree type. It can be random or some valid value within the current climate */
-	if (p1 != (uint)-1 && p1 - _tree_base_by_landscape[_opt.landscape] >= _tree_count_by_landscape[_opt.landscape]) return CMD_ERROR;
-
-	SET_EXPENSES_TYPE(EXPENSES_OTHER);
-
-	// make sure sx,sy are smaller than ex,ey
-	ex = TileX(tile);
-	ey = TileY(tile);
-	sx = TileX(p2);
-	sy = TileY(p2);
-	if (ex < sx) intswap(ex, sx);
-	if (ey < sy) intswap(ey, sy);
-
-	cost = 0; // total cost
-
-	for (x = sx; x <= ex; x++) {
-		for (y = sy; y <= ey; y++) {
-			TileIndex tile = TileXY(x, y);
-
-			if (!EnsureNoVehicle(tile)) continue;
-
-			switch (GetTileType(tile)) {
-				case MP_TREES:
-					// no more space for trees?
-					if (_game_mode != GM_EDITOR && GetTreeCount(tile) == 3) {
-						msg = STR_2803_TREE_ALREADY_HERE;
-						continue;
-					}
-
-					if (flags & DC_EXEC) {
-						AddTreeCount(tile, 1);
-						MarkTileDirtyByTile(tile);
-					}
-					// 2x as expensive to add more trees to an existing tile
-					cost += _price.build_trees * 2;
-					break;
-
-				case MP_CLEAR:
-					if (!IsTileOwner(tile, OWNER_NONE) ||
-							IsBridgeAbove(tile)) {
-						msg = STR_2804_SITE_UNSUITABLE;
-						continue;
-					}
-
-					switch (GetClearGround(tile)) {
-						case CLEAR_FIELDS: cost += _price.clear_3; break;
-						case CLEAR_ROCKS:  cost += _price.clear_2; break;
-						default: break;
-					}
-
-					if (flags & DC_EXEC) {
-						TreeType treetype;
-						uint growth;
-
-						if (_game_mode != GM_EDITOR && IsValidPlayer(_current_player)) {
-							Town *t = ClosestTownFromTile(tile, _patches.dist_local_authority);
-							if (t != NULL)
-								ChangeTownRating(t, RATING_TREE_UP_STEP, RATING_TREE_MAXIMUM);
-						}
-
-						treetype = p1;
-						if (treetype == TREE_INVALID) {
-							treetype = GetRandomTreeType(tile, GB(Random(), 24, 8));
-							if (treetype == TREE_INVALID) treetype = TREE_CACTUS;
-						}
-
-						growth = _game_mode == GM_EDITOR ? 3 : 0;
-						switch (GetClearGround(tile)) {
-							case CLEAR_ROUGH: MakeTree(tile, treetype, 0, growth, TREE_GROUND_ROUGH, 0); break;
-							case CLEAR_SNOW:  MakeTree(tile, treetype, 0, growth, TREE_GROUND_SNOW_DESERT, GetClearDensity(tile)); break;
-							default:          MakeTree(tile, treetype, 0, growth, TREE_GROUND_GRASS, 0); break;
-						}
-						MarkTileDirtyByTile(tile);
-
-						if (_game_mode == GM_EDITOR && IS_INT_INSIDE(treetype, TREE_RAINFOREST, TREE_CACTUS))
-							SetTropicZone(tile, TROPICZONE_RAINFOREST);
-					}
-					cost += _price.build_trees;
-					break;
-
-				default:
-					msg = STR_2804_SITE_UNSUITABLE;
-					break;
-			}
-		}
-	}
-
-	if (cost == 0) {
-		return_cmd_error(msg);
-	} else {
-		return cost;
-	}
-}
-
-typedef struct TreeListEnt {
-	uint32 image;
-	byte x,y;
-} TreeListEnt;
-
-static void DrawTile_Trees(TileInfo *ti)
-{
-	const uint32 *s;
-	const TreePos* d;
-	byte z;
-
-	switch (GetTreeGround(ti->tile)) {
-		case TREE_GROUND_GRASS: DrawClearLandTile(ti, 3); break;
-		case TREE_GROUND_ROUGH: DrawHillyLandTile(ti); break;
-		default: DrawGroundSprite(_tree_sprites_1[GetTreeDensity(ti->tile)] + _tileh_to_sprite[ti->tileh]); break;
-	}
-
-	DrawClearLandFence(ti);
-
-	z = ti->z;
-	if (ti->tileh != SLOPE_FLAT) {
-		z += 4;
-		if (IsSteepSlope(ti->tileh)) z += 4;
-	}
-
-	{
-		uint16 tmp = ti->x;
-		uint index;
-
-		tmp = ROR(tmp, 2);
-		tmp -= ti->y;
-		tmp = ROR(tmp, 3);
-		tmp -= ti->x;
-		tmp = ROR(tmp, 1);
-		tmp += ti->y;
-
-		d = _tree_layout_xy[GB(tmp, 4, 2)];
-
-		index = GB(tmp, 6, 2) + (GetTreeType(ti->tile) << 2);
-
-		/* different tree styles above one of the grounds */
-		if (GetTreeGround(ti->tile) == TREE_GROUND_SNOW_DESERT &&
-				GetTreeDensity(ti->tile) >= 2 &&
-				IS_INT_INSIDE(index, TREE_SUB_ARCTIC << 2, TREE_RAINFOREST << 2)) {
-			index += 164 - (TREE_SUB_ARCTIC << 2);
-		}
-
-		assert(index < lengthof(_tree_layout_sprite));
-		s = _tree_layout_sprite[index];
-	}
-
-	StartSpriteCombine();
-
-	if (!(_display_opt & DO_TRANS_BUILDINGS) || !_patches.invisible_trees) {
-		TreeListEnt te[4];
-		uint i;
-
-		/* put the trees to draw in a list */
-		i = GetTreeCount(ti->tile) + 1;
-		do {
-			uint32 image = s[0] + (--i == 0 ? GetTreeGrowth(ti->tile) : 3);
-			if (_display_opt & DO_TRANS_BUILDINGS) MAKE_TRANSPARENT(image);
-			te[i].image = image;
-			te[i].x = d->x;
-			te[i].y = d->y;
-			s++;
-			d++;
-		} while (i);
-
-		/* draw them in a sorted way */
-		for (;;) {
-			byte min = 0xFF;
-			TreeListEnt *tep = NULL;
-
-			i = GetTreeCount(ti->tile) + 1;
-			do {
-				if (te[--i].image != 0 && te[i].x + te[i].y < min) {
-					min = te[i].x + te[i].y;
-					tep = &te[i];
-				}
-			} while (i);
-
-			if (tep == NULL) break;
-
-			AddSortableSpriteToDraw(tep->image, ti->x + tep->x, ti->y + tep->y, 5, 5, 0x10, z);
-			tep->image = 0;
-		}
-	}
-
-	EndSpriteCombine();
-}
-
-
-static uint GetSlopeZ_Trees(TileIndex tile, uint x, uint y)
-{
-	uint z;
-	uint tileh = GetTileSlope(tile, &z);
-
-	return z + GetPartialZ(x & 0xF, y & 0xF, tileh);
-}
-
-static Slope GetSlopeTileh_Trees(TileIndex tile, Slope tileh)
-{
-	return tileh;
-}
-
-static int32 ClearTile_Trees(TileIndex tile, byte flags)
-{
-	uint num;
-
-	if ((flags & DC_EXEC) && IsValidPlayer(_current_player)) {
-		Town *t = ClosestTownFromTile(tile, _patches.dist_local_authority);
-		if (t != NULL)
-			ChangeTownRating(t, RATING_TREE_DOWN_STEP, RATING_TREE_MINIMUM);
-	}
-
-	num = GetTreeCount(tile) + 1;
-	if (IS_INT_INSIDE(GetTreeType(tile), TREE_RAINFOREST, TREE_CACTUS)) num *= 4;
-
-	if (flags & DC_EXEC) DoClearSquare(tile);
-
-	return num * _price.remove_trees;
-}
-
-static void GetAcceptedCargo_Trees(TileIndex tile, AcceptedCargo ac)
-{
-	/* not used */
-}
-
-static void GetTileDesc_Trees(TileIndex tile, TileDesc *td)
-{
-	TreeType tt = GetTreeType(tile);
-
-	if (IS_INT_INSIDE(tt, TREE_RAINFOREST, TREE_CACTUS)) {
-		td->str = STR_280F_RAINFOREST;
-	} else if (tt == TREE_CACTUS) {
-		td->str = STR_2810_CACTUS_PLANTS;
-	} else {
-		td->str = STR_280E_TREES;
-	}
-
-	td->owner = GetTileOwner(tile);
-}
-
-static void AnimateTile_Trees(TileIndex tile)
-{
-	/* not used */
-}
-
-static void TileLoopTreesDesert(TileIndex tile)
-{
-	switch (GetTropicZone(tile)) {
-		case TROPICZONE_DESERT:
-			if (GetTreeGround(tile) != TREE_GROUND_SNOW_DESERT) {
-				SetTreeGroundDensity(tile, TREE_GROUND_SNOW_DESERT, 3);
-				MarkTileDirtyByTile(tile);
-			}
-			break;
-
-		case TROPICZONE_RAINFOREST: {
-			static const SoundFx forest_sounds[] = {
-				SND_42_LOON_BIRD,
-				SND_43_LION,
-				SND_44_MONKEYS,
-				SND_48_DISTANT_BIRD
-			};
-			uint32 r = Random();
-
-			if (CHANCE16I(1, 200, r)) SndPlayTileFx(forest_sounds[GB(r, 16, 2)], tile);
-			break;
-		}
-
-		default: break;
-	}
-}
-
-static void TileLoopTreesAlps(TileIndex tile)
-{
-	int k = GetTileZ(tile) - _opt.snow_line + TILE_HEIGHT;
-
-	if (k < 0) {
-		if (GetTreeGround(tile) != TREE_GROUND_SNOW_DESERT) return;
-		SetTreeGroundDensity(tile, TREE_GROUND_GRASS, 0);
-	} else {
-		uint density = min((uint)k / TILE_HEIGHT, 3);
-
-		if (GetTreeGround(tile) != TREE_GROUND_SNOW_DESERT ||
-				GetTreeDensity(tile) != density) {
-			SetTreeGroundDensity(tile, TREE_GROUND_SNOW_DESERT, density);
-		} else {
-			if (GetTreeDensity(tile) == 3) {
-				uint32 r = Random();
-				if (CHANCE16I(1, 200, r)) {
-					SndPlayTileFx((r & 0x80000000) ? SND_39_HEAVY_WIND : SND_34_WIND, tile);
-				}
-			}
-			return;
-		}
-	}
-	MarkTileDirtyByTile(tile);
-}
-
-static void TileLoop_Trees(TileIndex tile)
-{
-	switch (_opt.landscape) {
-		case LT_DESERT: TileLoopTreesDesert(tile); break;
-		case LT_HILLY:  TileLoopTreesAlps(tile);   break;
-	}
-
-	TileLoopClearHelper(tile);
-
-	if (GetTreeCounter(tile) < 15) {
-		AddTreeCounter(tile, 1);
-		return;
-	}
-	SetTreeCounter(tile, 0);
-
-	switch (GetTreeGrowth(tile)) {
-		case 3: /* regular sized tree */
-			if (_opt.landscape == LT_DESERT &&
-					GetTreeType(tile) != TREE_CACTUS &&
-					GetTropicZone(tile) == TROPICZONE_DESERT) {
-				AddTreeGrowth(tile, 1);
-			} else {
-				switch (GB(Random(), 0, 3)) {
-					case 0: /* start destructing */
-						AddTreeGrowth(tile, 1);
-						break;
-
-					case 1: /* add a tree */
-						if (GetTreeCount(tile) < 3) {
-							AddTreeCount(tile, 1);
-							SetTreeGrowth(tile, 0);
-							break;
-						}
-						/* FALL THROUGH */
-
-					case 2: { /* add a neighbouring tree */
-						TreeType treetype = GetTreeType(tile);
-
-						tile += TileOffsByDir(Random() & 7);
-
-						if (!IsTileType(tile, MP_CLEAR) || IsBridgeAbove(tile)) return;
-
-						switch (GetClearGround(tile)) {
-							case CLEAR_GRASS:
-								if (GetClearDensity(tile) != 3) return;
-								MakeTree(tile, treetype, 0, 0, TREE_GROUND_GRASS, 0);
-								break;
-
-							case CLEAR_ROUGH: MakeTree(tile, treetype, 0, 0, TREE_GROUND_ROUGH, 0); break;
-							case CLEAR_SNOW:  MakeTree(tile, treetype, 0, 0, TREE_GROUND_SNOW_DESERT, GetClearDensity(tile)); break;
-							default: return;
-						}
-						break;
-					}
-
-					default:
-						return;
-				}
-			}
-			break;
-
-		case 6: /* final stage of tree destruction */
-			if (GetTreeCount(tile) > 0) {
-				/* more than one tree, delete it */
-				AddTreeCount(tile, -1);
-				SetTreeGrowth(tile, 3);
-			} else {
-				/* just one tree, change type into MP_CLEAR */
-				switch (GetTreeGround(tile)) {
-					case TREE_GROUND_GRASS: MakeClear(tile, CLEAR_GRASS, 3); break;
-					case TREE_GROUND_ROUGH: MakeClear(tile, CLEAR_ROUGH, 3); break;
-					default: MakeClear(tile, CLEAR_SNOW, GetTreeDensity(tile)); break;
-				}
-			}
-			break;
-
-		default:
-			AddTreeGrowth(tile, 1);
-			break;
-	}
-
-	MarkTileDirtyByTile(tile);
-}
-
-void OnTick_Trees(void)
-{
-	uint32 r;
-	TileIndex tile;
-	ClearGround ct;
-	TreeType tree;
-
-	/* place a tree at a random rainforest spot */
-	if (_opt.landscape == LT_DESERT &&
-			(r = Random(), tile = RandomTileSeed(r), GetTropicZone(tile) == TROPICZONE_RAINFOREST) &&
-			IsTileType(tile, MP_CLEAR) &&
-			!IsBridgeAbove(tile) &&
-			(ct = GetClearGround(tile), ct == CLEAR_GRASS || ct == CLEAR_ROUGH) &&
-			(tree = GetRandomTreeType(tile, GB(r, 24, 8))) != TREE_INVALID) {
-		MakeTree(tile, tree, 0, 0, ct == CLEAR_ROUGH ? TREE_GROUND_ROUGH : TREE_GROUND_GRASS, 0);
-	}
-
-	// byte underflow
-	if (--_trees_tick_ctr != 0) return;
-
-	/* place a tree at a random spot */
-	r = Random();
-	tile = TILE_MASK(r);
-	if (IsTileType(tile, MP_CLEAR) &&
-			!IsBridgeAbove(tile) &&
-			(ct = GetClearGround(tile), ct == CLEAR_GRASS || ct == CLEAR_ROUGH || ct == CLEAR_SNOW) &&
-			(tree = GetRandomTreeType(tile, GB(r, 24, 8))) != TREE_INVALID) {
-		switch (ct) {
-			case CLEAR_GRASS: MakeTree(tile, tree, 0, 0, TREE_GROUND_GRASS, 0); break;
-			case CLEAR_ROUGH: MakeTree(tile, tree, 0, 0, TREE_GROUND_ROUGH, 0); break;
-			default: MakeTree(tile, tree, 0, 0, TREE_GROUND_SNOW_DESERT, GetClearDensity(tile)); break;
-		}
-	}
-}
-
-static void ClickTile_Trees(TileIndex tile)
-{
-	/* not used */
-}
-
-static uint32 GetTileTrackStatus_Trees(TileIndex tile, TransportType mode)
-{
-	return 0;
-}
-
-static void ChangeTileOwner_Trees(TileIndex tile, PlayerID old_player, PlayerID new_player)
-{
-	/* not used */
-}
-
-void InitializeTrees(void)
-{
-	_trees_tick_ctr = 0;
-}
-
-
-const TileTypeProcs _tile_type_trees_procs = {
-	DrawTile_Trees,           /* draw_tile_proc */
-	GetSlopeZ_Trees,          /* get_slope_z_proc */
-	ClearTile_Trees,          /* clear_tile_proc */
-	GetAcceptedCargo_Trees,   /* get_accepted_cargo_proc */
-	GetTileDesc_Trees,        /* get_tile_desc_proc */
-	GetTileTrackStatus_Trees, /* get_tile_track_status_proc */
-	ClickTile_Trees,          /* click_tile_proc */
-	AnimateTile_Trees,        /* animate_tile_proc */
-	TileLoop_Trees,           /* tile_loop_clear */
-	ChangeTileOwner_Trees,    /* change_tile_owner_clear */
-	NULL,                     /* get_produced_cargo_proc */
-	NULL,                     /* vehicle_enter_tile_proc */
-	GetSlopeTileh_Trees,      /* get_slope_tileh_proc */
-};