tron@2186: /* $Id$ */
tron@2186: 
rubidium@10429: /** @file landscape.cpp Functions related to the landscape (slopes etc.). */
rubidium@10429: 
truelight@0: #include "stdafx.h"
Darkvater@1891: #include "openttd.h"
celestar@5573: #include "bridge_map.h"
truelight@4300: #include "heightmap.h"
tron@3144: #include "clear_map.h"
tron@1349: #include "spritecache.h"
truelight@0: #include <stdarg.h>
rubidium@8721: #include "viewport_func.h"
rubidium@8612: #include "command_func.h"
maedhros@6669: #include "landscape.h"
tron@2159: #include "variables.h"
tron@3144: #include "void_map.h"
tron@3111: #include "water_map.h"
truelight@4300: #include "tgp.h"
truelight@4300: #include "genworld.h"
rubidium@8615: #include "tile_cmd.h"
rubidium@8626: #include "core/alloc_func.hpp"
belugas@8647: #include "fios.h"
rubidium@8627: #include "window_func.h"
rubidium@8627: #include "functions.h"
rubidium@8636: #include "date_func.h"
rubidium@8640: #include "vehicle_func.h"
rubidium@8766: #include "settings_type.h"
frosch@8876: #include "water.h"
rubidium@10272: #include "effectvehicle_func.h"
rubidium@10444: #include "landscape_type.h"
truelight@0: 
rubidium@8760: #include "table/sprites.h"
rubidium@8760: 
truelight@183: extern const TileTypeProcs
truelight@0: 	_tile_type_clear_procs,
truelight@0: 	_tile_type_rail_procs,
truelight@0: 	_tile_type_road_procs,
truelight@0: 	_tile_type_town_procs,
truelight@0: 	_tile_type_trees_procs,
truelight@0: 	_tile_type_station_procs,
truelight@0: 	_tile_type_water_procs,
truelight@0: 	_tile_type_dummy_procs,
truelight@0: 	_tile_type_industry_procs,
truelight@0: 	_tile_type_tunnelbridge_procs,
truelight@0: 	_tile_type_unmovable_procs;
truelight@0: 
truelight@0: const TileTypeProcs * const _tile_type_procs[16] = {
truelight@0: 	&_tile_type_clear_procs,
truelight@0: 	&_tile_type_rail_procs,
truelight@0: 	&_tile_type_road_procs,
truelight@0: 	&_tile_type_town_procs,
truelight@0: 	&_tile_type_trees_procs,
truelight@0: 	&_tile_type_station_procs,
truelight@0: 	&_tile_type_water_procs,
truelight@0: 	&_tile_type_dummy_procs,
truelight@0: 	&_tile_type_industry_procs,
truelight@0: 	&_tile_type_tunnelbridge_procs,
truelight@0: 	&_tile_type_unmovable_procs,
truelight@0: };
truelight@0: 
truelight@0: /* landscape slope => sprite */
truelight@0: const byte _tileh_to_sprite[32] = {
rubidium@4344: 	0, 1, 2, 3, 4, 5, 6,  7, 8, 9, 10, 11, 12, 13, 14, 0,
rubidium@4344: 	0, 0, 0, 0, 0, 0, 0, 16, 0, 0,  0, 17,  0, 15, 18, 0,
truelight@0: };
truelight@0: 
rubidium@7831: SnowLine *_snow_line = NULL;
tron@1958: 
rubidium@7831: /**
rubidium@7831:  * Applys a foundation to a slope.
rubidium@7831:  *
rubidium@7831:  * @pre      Foundation and slope must be valid combined.
rubidium@7831:  * @param f  The #Foundation.
rubidium@7831:  * @param s  The #Slope to modify.
rubidium@7831:  * @return   Increment to the tile Z coordinate.
rubidium@7831:  */
rubidium@7831: uint ApplyFoundationToSlope(Foundation f, Slope *s)
rubidium@7831: {
rubidium@7831: 	if (!IsFoundation(f)) return 0;
rubidium@7831: 
rubidium@7831: 	if (IsLeveledFoundation(f)) {
frosch@10945: 		uint dz = TILE_HEIGHT + (IsSteepSlope(*s) ? TILE_HEIGHT : 0);
rubidium@7831: 		*s = SLOPE_FLAT;
frosch@10945: 		return dz;
rubidium@7831: 	}
rubidium@7831: 
rubidium@8266: 	if (f != FOUNDATION_STEEP_BOTH && IsNonContinuousFoundation(f)) {
rubidium@8266: 		*s = HalftileSlope(*s, GetHalftileFoundationCorner(f));
rubidium@8266: 		return 0;
rubidium@8266: 	}
rubidium@8266: 
rubidium@8266: 	if (IsSpecialRailFoundation(f)) {
rubidium@8266: 		*s = SlopeWithThreeCornersRaised(OppositeCorner(GetRailFoundationCorner(f)));
rubidium@8266: 		return 0;
rubidium@8266: 	}
rubidium@8266: 
rubidium@7831: 	uint dz = IsSteepSlope(*s) ? TILE_HEIGHT : 0;
rubidium@8174: 	Corner highest_corner = GetHighestSlopeCorner(*s);
rubidium@7831: 
rubidium@7831: 	switch (f) {
rubidium@7831: 		case FOUNDATION_INCLINED_X:
rubidium@8174: 			*s = (((highest_corner == CORNER_W) || (highest_corner == CORNER_S)) ? SLOPE_SW : SLOPE_NE);
rubidium@7831: 			break;
rubidium@7831: 
rubidium@7831: 		case FOUNDATION_INCLINED_Y:
rubidium@8174: 			*s = (((highest_corner == CORNER_S) || (highest_corner == CORNER_E)) ? SLOPE_SE : SLOPE_NW);
rubidium@7831: 			break;
rubidium@7831: 
rubidium@7831: 		case FOUNDATION_STEEP_LOWER:
rubidium@8174: 			*s = SlopeWithOneCornerRaised(highest_corner);
rubidium@7831: 			break;
rubidium@7831: 
rubidium@8266: 		case FOUNDATION_STEEP_BOTH:
rubidium@8266: 			*s = HalftileSlope(SlopeWithOneCornerRaised(highest_corner), highest_corner);
rubidium@7831: 			break;
rubidium@7831: 
rubidium@7831: 		default: NOT_REACHED();
rubidium@7831: 	}
rubidium@7831: 	return dz;
rubidium@7831: }
rubidium@7831: 
truelight@0: 
smatz@9313: /**
smatz@9313:  * Determines height at given coordinate of a slope
smatz@9313:  * @param x x coordinate
smatz@9313:  * @param y y coordinate
smatz@9313:  * @param corners slope to examine
smatz@9313:  * @return height of given point of given slope
smatz@9313:  */
tron@3636: uint GetPartialZ(int x, int y, Slope corners)
truelight@0: {
rubidium@8260: 	if (IsHalftileSlope(corners)) {
rubidium@8260: 		switch (GetHalftileSlopeCorner(corners)) {
rubidium@8260: 			case CORNER_W:
rubidium@8260: 				if (x - y >= 0) return GetSlopeMaxZ(corners);
rubidium@8260: 				break;
rubidium@8260: 
rubidium@8260: 			case CORNER_S:
rubidium@8260: 				if (x - (y ^ 0xF) >= 0) return GetSlopeMaxZ(corners);
rubidium@8260: 				break;
rubidium@8260: 
rubidium@8260: 			case CORNER_E:
rubidium@8260: 				if (y - x >= 0) return GetSlopeMaxZ(corners);
rubidium@8260: 				break;
rubidium@8260: 
rubidium@8260: 			case CORNER_N:
rubidium@8260: 				if ((y ^ 0xF) - x >= 0) return GetSlopeMaxZ(corners);
rubidium@8260: 				break;
rubidium@8260: 
rubidium@8260: 			default: NOT_REACHED();
rubidium@8260: 		}
rubidium@8260: 	}
rubidium@8260: 
truelight@0: 	int z = 0;
truelight@0: 
frosch@8909: 	switch (RemoveHalftileSlope(corners)) {
smatz@9313: 		case SLOPE_W:
smatz@9313: 			if (x - y >= 0) {
smatz@9313: 				z = (x - y) >> 1;
smatz@9313: 			}
smatz@9313: 			break;
truelight@0: 
smatz@9313: 		case SLOPE_S:
smatz@9313: 			y ^= 0xF;
smatz@9313: 			if ((x - y) >= 0) {
smatz@9313: 				z = (x - y) >> 1;
smatz@9313: 			}
smatz@9313: 			break;
truelight@0: 
smatz@9313: 		case SLOPE_SW:
smatz@9313: 			z = (x >> 1) + 1;
smatz@9313: 			break;
truelight@0: 
smatz@9313: 		case SLOPE_E:
smatz@9313: 			if (y - x >= 0) {
smatz@9313: 				z = (y - x) >> 1;
smatz@9313: 			}
smatz@9313: 			break;
truelight@0: 
smatz@9313: 		case SLOPE_EW:
smatz@9313: 		case SLOPE_NS:
smatz@9313: 		case SLOPE_ELEVATED:
smatz@9313: 			z = 4;
smatz@9313: 			break;
truelight@0: 
smatz@9313: 		case SLOPE_SE:
smatz@9313: 			z = (y >> 1) + 1;
smatz@9313: 			break;
truelight@183: 
smatz@9313: 		case SLOPE_WSE:
smatz@9313: 			z = 8;
smatz@9313: 			y ^= 0xF;
smatz@9313: 			if (x - y < 0) {
smatz@9313: 				z += (x - y) >> 1;
smatz@9313: 			}
smatz@9313: 			break;
smatz@9313: 
smatz@9313: 		case SLOPE_N:
smatz@9313: 			y ^= 0xF;
smatz@9313: 			if (y - x >= 0) {
smatz@9313: 				z = (y - x) >> 1;
smatz@9313: 			}
smatz@9313: 			break;
smatz@9313: 
smatz@9313: 		case SLOPE_NW:
smatz@9313: 			z = (y ^ 0xF) >> 1;
smatz@9313: 			break;
smatz@9313: 
smatz@9313: 		case SLOPE_NWS:
smatz@9313: 			z = 8;
smatz@9313: 			if (x - y < 0) {
smatz@9313: 				z += (x - y) >> 1;
smatz@9313: 			}
smatz@9313: 			break;
smatz@9313: 
smatz@9313: 		case SLOPE_NE:
smatz@9313: 			z = (x ^ 0xF) >> 1;
smatz@9313: 			break;
smatz@9313: 
smatz@9313: 		case SLOPE_ENW:
smatz@9313: 			z = 8;
smatz@9313: 			y ^= 0xF;
smatz@9313: 			if (y - x < 0) {
smatz@9313: 				z += (y - x) >> 1;
smatz@9313: 			}
smatz@9313: 			break;
smatz@9313: 
smatz@9313: 		case SLOPE_SEN:
smatz@9313: 			z = 8;
smatz@9313: 			if (y - x < 0) {
smatz@9313: 				z += (y - x) >> 1;
smatz@9313: 			}
smatz@9313: 			break;
smatz@9313: 
smatz@9313: 		case SLOPE_STEEP_S:
smatz@9313: 			z = 1 + ((x + y) >> 1);
smatz@9313: 			break;
smatz@9313: 
smatz@9313: 		case SLOPE_STEEP_W:
smatz@9313: 			z = 1 + ((x + (y ^ 0xF)) >> 1);
smatz@9313: 			break;
smatz@9313: 
smatz@9313: 		case SLOPE_STEEP_N:
smatz@9313: 			z = 1 + (((x ^ 0xF) + (y ^ 0xF)) >> 1);
smatz@9313: 			break;
smatz@9313: 
smatz@9313: 		case SLOPE_STEEP_E:
smatz@9313: 			z = 1 + (((x ^ 0xF) + y) >> 1);
smatz@9313: 			break;
tron@3636: 
tron@3636: 		default: break;
truelight@0: 	}
truelight@0: 
truelight@0: 	return z;
truelight@0: }
truelight@0: 
tron@2951: uint GetSlopeZ(int x, int y)
truelight@0: {
tron@4231: 	TileIndex tile = TileVirtXY(x, y);
truelight@0: 
tron@4231: 	return _tile_type_procs[GetTileType(tile)]->get_slope_z_proc(tile, x, y);
truelight@0: }
truelight@0: 
rubidium@8224: /**
rubidium@8266:  * Determine the Z height of a corner relative to TileZ.
rubidium@8266:  *
rubidium@8266:  * @pre The slope must not be a halftile slope.
rubidium@8266:  *
rubidium@8266:  * @param tileh The slope.
rubidium@8266:  * @param corner The corner.
rubidium@8266:  * @return Z position of corner relative to TileZ.
rubidium@8266:  */
rubidium@8266: int GetSlopeZInCorner(Slope tileh, Corner corner)
rubidium@8266: {
rubidium@8266: 	assert(!IsHalftileSlope(tileh));
frosch@8909: 	return ((tileh & SlopeWithOneCornerRaised(corner)) != 0 ? TILE_HEIGHT : 0) + (tileh == SteepSlope(corner) ? TILE_HEIGHT : 0);
rubidium@8266: }
rubidium@8266: 
rubidium@8266: /**
rubidium@8224:  * Determine the Z height of the corners of a specific tile edge
rubidium@8224:  *
rubidium@8260:  * @note If a tile has a non-continuous halftile foundation, a corner can have different heights wrt. it's edges.
rubidium@8260:  *
rubidium@8224:  * @pre z1 and z2 must be initialized (typ. with TileZ). The corner heights just get added.
rubidium@8224:  *
rubidium@8224:  * @param tileh The slope of the tile.
rubidium@8224:  * @param edge The edge of interest.
rubidium@8224:  * @param z1 Gets incremented by the height of the first corner of the edge. (near corner wrt. the camera)
rubidium@8224:  * @param z2 Gets incremented by the height of the second corner of the edge. (far corner wrt. the camera)
rubidium@8224:  */
rubidium@8224: void GetSlopeZOnEdge(Slope tileh, DiagDirection edge, int *z1, int *z2)
rubidium@8224: {
rubidium@8224: 	static const Slope corners[4][4] = {
rubidium@8224: 		/*    corner     |          steep slope
rubidium@8224: 		 *  z1      z2   |       z1             z2        */
rubidium@8224: 		{SLOPE_E, SLOPE_N, SLOPE_STEEP_E, SLOPE_STEEP_N}, // DIAGDIR_NE, z1 = E, z2 = N
rubidium@8224: 		{SLOPE_S, SLOPE_E, SLOPE_STEEP_S, SLOPE_STEEP_E}, // DIAGDIR_SE, z1 = S, z2 = E
rubidium@8224: 		{SLOPE_S, SLOPE_W, SLOPE_STEEP_S, SLOPE_STEEP_W}, // DIAGDIR_SW, z1 = S, z2 = W
rubidium@8224: 		{SLOPE_W, SLOPE_N, SLOPE_STEEP_W, SLOPE_STEEP_N}, // DIAGDIR_NW, z1 = W, z2 = N
rubidium@8224: 	};
rubidium@8224: 
rubidium@8260: 	int halftile_test = (IsHalftileSlope(tileh) ? SlopeWithOneCornerRaised(GetHalftileSlopeCorner(tileh)) : 0);
rubidium@8260: 	if (halftile_test == corners[edge][0]) *z2 += TILE_HEIGHT; // The slope is non-continuous in z2. z2 is on the upper side.
rubidium@8260: 	if (halftile_test == corners[edge][1]) *z1 += TILE_HEIGHT; // The slope is non-continuous in z1. z1 is on the upper side.
rubidium@8260: 
rubidium@8224: 	if ((tileh & corners[edge][0]) != 0) *z1 += TILE_HEIGHT; // z1 is raised
rubidium@8224: 	if ((tileh & corners[edge][1]) != 0) *z2 += TILE_HEIGHT; // z2 is raised
frosch@8909: 	if (RemoveHalftileSlope(tileh) == corners[edge][2]) *z1 += TILE_HEIGHT; // z1 is highest corner of a steep slope
frosch@8909: 	if (RemoveHalftileSlope(tileh) == corners[edge][3]) *z2 += TILE_HEIGHT; // z2 is highest corner of a steep slope
rubidium@8224: }
tron@4061: 
frosch@8909: /**
frosch@8909:  * Get slope of a tile on top of a (possible) foundation
frosch@8909:  * If a tile does not have a foundation, the function returns the same as GetTileSlope.
frosch@8909:  *
frosch@8909:  * @param tile The tile of interest.
frosch@8909:  * @param z returns the z of the foundation slope. (Can be NULL, if not needed)
frosch@8909:  * @return The slope on top of the foundation.
frosch@8909:  */
frosch@8876: Slope GetFoundationSlope(TileIndex tile, uint* z)
dominik@37: {
tron@4061: 	Slope tileh = GetTileSlope(tile, z);
rubidium@7831: 	Foundation f = _tile_type_procs[GetTileType(tile)]->get_foundation_proc(tile, tileh);
frosch@8876: 	uint z_inc = ApplyFoundationToSlope(f, &tileh);
frosch@8876: 	if (z != NULL) *z += z_inc;
rubidium@7831: 	return tileh;
tron@4061: }
dominik@39: 
tron@4061: 
tron@4061: static bool HasFoundationNW(TileIndex tile, Slope slope_here, uint z_here)
tron@4061: {
tron@4061: 	uint z;
tron@4061: 
rubidium@8224: 	int z_W_here = z_here;
rubidium@8224: 	int z_N_here = z_here;
rubidium@8224: 	GetSlopeZOnEdge(slope_here, DIAGDIR_NW, &z_W_here, &z_N_here);
rubidium@8224: 
rubidium@8224: 	Slope slope = GetFoundationSlope(TILE_ADDXY(tile, 0, -1), &z);
rubidium@8224: 	int z_W = z;
rubidium@8224: 	int z_N = z;
rubidium@8224: 	GetSlopeZOnEdge(slope, DIAGDIR_SE, &z_W, &z_N);
rubidium@8224: 
rubidium@8224: 	return (z_N_here > z_N) || (z_W_here > z_W);
dominik@37: }
dominik@37: 
tron@4061: 
tron@4061: static bool HasFoundationNE(TileIndex tile, Slope slope_here, uint z_here)
tron@4061: {
tron@4061: 	uint z;
tron@4061: 
rubidium@8224: 	int z_E_here = z_here;
rubidium@8224: 	int z_N_here = z_here;
rubidium@8224: 	GetSlopeZOnEdge(slope_here, DIAGDIR_NE, &z_E_here, &z_N_here);
rubidium@8224: 
rubidium@8224: 	Slope slope = GetFoundationSlope(TILE_ADDXY(tile, -1, 0), &z);
rubidium@8224: 	int z_E = z;
rubidium@8224: 	int z_N = z;
rubidium@8224: 	GetSlopeZOnEdge(slope, DIAGDIR_SW, &z_E, &z_N);
rubidium@8224: 
rubidium@8224: 	return (z_N_here > z_N) || (z_E_here > z_E);
tron@4061: }
tron@4061: 
tron@4061: 
rubidium@7831: void DrawFoundation(TileInfo *ti, Foundation f)
truelight@0: {
rubidium@7831: 	if (!IsFoundation(f)) return;
rubidium@7831: 
rubidium@8266: 	/* Two part foundations must be drawn separately */
rubidium@8266: 	assert(f != FOUNDATION_STEEP_BOTH);
rubidium@8266: 
rubidium@8263: 	uint sprite_block = 0;
tron@4061: 	uint z;
rubidium@7831: 	Slope slope = GetFoundationSlope(ti->tile, &z);
dominik@39: 
rubidium@8263: 	/* Select the needed block of foundations sprites
rubidium@8263: 	 * Block 0: Walls at NW and NE edge
rubidium@8263: 	 * Block 1: Wall  at        NE edge
rubidium@8263: 	 * Block 2: Wall  at NW        edge
rubidium@8263: 	 * Block 3: No walls at NW or NE edge
rubidium@8263: 	 */
rubidium@8263: 	if (!HasFoundationNW(ti->tile, slope, z)) sprite_block += 1;
rubidium@8263: 	if (!HasFoundationNE(ti->tile, slope, z)) sprite_block += 2;
rubidium@8263: 
rubidium@8263: 	/* Use the original slope sprites if NW and NE borders should be visible */
rubidium@8263: 	SpriteID leveled_base = (sprite_block == 0 ? (int)SPR_FOUNDATION_BASE : (SPR_SLOPES_VIRTUAL_BASE + sprite_block * SPR_TRKFOUND_BLOCK_SIZE));
rubidium@8263: 	SpriteID inclined_base = SPR_SLOPES_VIRTUAL_BASE + SPR_SLOPES_INCLINED_OFFSET + sprite_block * SPR_TRKFOUND_BLOCK_SIZE;
rubidium@8266: 	SpriteID halftile_base = SPR_HALFTILE_FOUNDATION_BASE + sprite_block * SPR_HALFTILE_BLOCK_SIZE;
dominik@37: 
tron@4253: 	if (IsSteepSlope(ti->tileh)) {
rubidium@8266: 		if (!IsNonContinuousFoundation(f)) {
rubidium@8266: 			/* Lower part of foundation */
rubidium@8266: 			AddSortableSpriteToDraw(
rubidium@8266: 				leveled_base + (ti->tileh & ~SLOPE_STEEP), PAL_NONE, ti->x, ti->y, 16, 16, 7, ti->z
rubidium@8266: 			);
rubidium@8266: 		}
rubidium@7831: 
rubidium@8174: 		Corner highest_corner = GetHighestSlopeCorner(ti->tileh);
rubidium@7831: 		ti->z += ApplyFoundationToSlope(f, &ti->tileh);
rubidium@7831: 
rubidium@7831: 		if (IsInclinedFoundation(f)) {
rubidium@7831: 			/* inclined foundation */
rubidium@7831: 			byte inclined = highest_corner * 2 + (f == FOUNDATION_INCLINED_Y ? 1 : 0);
rubidium@7831: 
rubidium@8263: 			AddSortableSpriteToDraw(inclined_base + inclined, PAL_NONE, ti->x, ti->y, 16, 16, 1, ti->z);
tron@4253: 			OffsetGroundSprite(31, 9);
frosch@10945: 		} else if (IsLeveledFoundation(f)) {
frosch@10945: 			AddSortableSpriteToDraw(leveled_base + SlopeWithOneCornerRaised(highest_corner), PAL_NONE, ti->x, ti->y, 16, 16, 7, ti->z - TILE_HEIGHT);
frosch@10945: 			OffsetGroundSprite(31, 1);
rubidium@8266: 		} else if (f == FOUNDATION_STEEP_LOWER) {
belugas@6527: 			/* one corner raised */
tron@4253: 			OffsetGroundSprite(31, 1);
rubidium@8266: 		} else {
rubidium@8266: 			/* halftile foundation */
rubidium@8266: 			int x_bb = (((highest_corner == CORNER_W) || (highest_corner == CORNER_S)) ? 8 : 0);
rubidium@8266: 			int y_bb = (((highest_corner == CORNER_S) || (highest_corner == CORNER_E)) ? 8 : 0);
rubidium@8266: 
rubidium@8266: 			AddSortableSpriteToDraw(halftile_base + highest_corner, PAL_NONE, ti->x + x_bb, ti->y + y_bb, 8, 8, 7, ti->z + TILE_HEIGHT);
rubidium@8266: 			OffsetGroundSprite(31, 9);
tron@4253: 		}
truelight@0: 	} else {
rubidium@7831: 		if (IsLeveledFoundation(f)) {
rubidium@8263: 			/* leveled foundation */
rubidium@8263: 			AddSortableSpriteToDraw(leveled_base + ti->tileh, PAL_NONE, ti->x, ti->y, 16, 16, 7, ti->z);
tron@4253: 			OffsetGroundSprite(31, 1);
rubidium@8266: 		} else if (IsNonContinuousFoundation(f)) {
rubidium@8266: 			/* halftile foundation */
rubidium@8266: 			Corner halftile_corner = GetHalftileFoundationCorner(f);
rubidium@8266: 			int x_bb = (((halftile_corner == CORNER_W) || (halftile_corner == CORNER_S)) ? 8 : 0);
rubidium@8266: 			int y_bb = (((halftile_corner == CORNER_S) || (halftile_corner == CORNER_E)) ? 8 : 0);
rubidium@8266: 
rubidium@8266: 			AddSortableSpriteToDraw(halftile_base + halftile_corner, PAL_NONE, ti->x + x_bb, ti->y + y_bb, 8, 8, 7, ti->z);
rubidium@8266: 			OffsetGroundSprite(31, 9);
rubidium@8266: 		} else if (IsSpecialRailFoundation(f)) {
rubidium@8266: 			/* anti-zig-zag foundation */
rubidium@8266: 			SpriteID spr;
rubidium@8266: 			if (ti->tileh == SLOPE_NS || ti->tileh == SLOPE_EW) {
rubidium@8266: 				/* half of leveled foundation under track corner */
rubidium@8266: 				spr = leveled_base + SlopeWithThreeCornersRaised(GetRailFoundationCorner(f));
rubidium@8266: 			} else {
rubidium@8266: 				/* tile-slope = sloped along X/Y, foundation-slope = three corners raised */
rubidium@8266: 				spr = inclined_base + 2 * GetRailFoundationCorner(f) + ((ti->tileh == SLOPE_SW || ti->tileh == SLOPE_NE) ? 1 : 0);
rubidium@8266: 			}
rubidium@8266: 			AddSortableSpriteToDraw(spr, PAL_NONE, ti->x, ti->y, 16, 16, 7, ti->z);
rubidium@8266: 			OffsetGroundSprite(31, 9);
tron@4253: 		} else {
belugas@6527: 			/* inclined foundation */
rubidium@7831: 			byte inclined = GetHighestSlopeCorner(ti->tileh) * 2 + (f == FOUNDATION_INCLINED_Y ? 1 : 0);
rubidium@7831: 
rubidium@8263: 			AddSortableSpriteToDraw(inclined_base + inclined, PAL_NONE, ti->x, ti->y, 16, 16, 1, ti->z);
tron@4253: 			OffsetGroundSprite(31, 9);
tron@4246: 		}
rubidium@7831: 		ti->z += ApplyFoundationToSlope(f, &ti->tileh);
truelight@0: 	}
truelight@0: }
truelight@0: 
tron@1589: void DoClearSquare(TileIndex tile)
truelight@0: {
tron@3447: 	MakeClear(tile, CLEAR_GRASS, _generating_world ? 3 : 0);
tron@2955: 	MarkTileDirtyByTile(tile);
truelight@0: }
truelight@0: 
frosch@9112: /** Returns information about trackdirs and signal states.
smatz@9092:  * If there is any trackbit at 'side', return all trackdirbits.
frosch@9112:  * For TRANSPORT_ROAD, return no trackbits if there is no roadbit (of given subtype) at given side.
smatz@9092:  * @param tile tile to get info about
smatz@9092:  * @param mode transport type
smatz@9092:  * @param sub_mode for TRANSPORT_ROAD, roadtypes to check
smatz@9092:  * @param side side we are entering from, INVALID_DIAGDIR to return all trackbits
smatz@9092:  * @return trackdirbits and other info depending on 'mode'
smatz@9092:  */
frosch@9112: TrackStatus GetTileTrackStatus(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
truelight@0: {
smatz@9092: 	return _tile_type_procs[GetTileType(tile)]->get_tile_track_status_proc(tile, mode, sub_mode, side);
truelight@0: }
truelight@0: 
rubidium@5838: void ChangeTileOwner(TileIndex tile, PlayerID old_player, PlayerID new_player)
truelight@0: {
tron@1214: 	_tile_type_procs[GetTileType(tile)]->change_tile_owner_proc(tile, old_player, new_player);
truelight@0: }
truelight@0: 
tron@1589: void GetAcceptedCargo(TileIndex tile, AcceptedCargo ac)
truelight@0: {
truelight@0: 	memset(ac, 0, sizeof(AcceptedCargo));
tron@1214: 	_tile_type_procs[GetTileType(tile)]->get_accepted_cargo_proc(tile, ac);
truelight@0: }
truelight@0: 
tron@1589: void AnimateTile(TileIndex tile)
truelight@0: {
tron@1214: 	_tile_type_procs[GetTileType(tile)]->animate_tile_proc(tile);
truelight@0: }
truelight@0: 
tron@1589: void ClickTile(TileIndex tile)
truelight@0: {
tron@1214: 	_tile_type_procs[GetTileType(tile)]->click_tile_proc(tile);
truelight@0: }
truelight@0: 
tron@1589: void GetTileDesc(TileIndex tile, TileDesc *td)
truelight@0: {
tron@1214: 	_tile_type_procs[GetTileType(tile)]->get_tile_desc_proc(tile, td);
truelight@0: }
truelight@0: 
maedhros@6669: /**
maedhros@6669:  * Has a snow line table already been loaded.
maedhros@6669:  * @return true if the table has been loaded already.
maedhros@6669:  */
maedhros@6669: bool IsSnowLineSet(void)
maedhros@6669: {
maedhros@6669: 	return _snow_line != NULL;
maedhros@6669: }
maedhros@6669: 
maedhros@6669: /**
maedhros@6669:  * Set a variable snow line, as loaded from a newgrf file.
maedhros@6669:  * @param table the 12 * 32 byte table containing the snowline for each day
maedhros@6669:  */
maedhros@6669: void SetSnowLine(byte table[SNOW_LINE_MONTHS][SNOW_LINE_DAYS])
maedhros@6669: {
maedhros@6669: 	_snow_line = CallocT<SnowLine>(1);
maedhros@6669: 	memcpy(_snow_line->table, table, sizeof(_snow_line->table));
maedhros@6669: 
maedhros@6669: 	for (uint i = 0; i < SNOW_LINE_MONTHS; i++) {
maedhros@6669: 		for (uint j = 0; j < SNOW_LINE_DAYS; j++) {
maedhros@6669: 			_snow_line->highest_value = max(_snow_line->highest_value, table[i][j]);
maedhros@6669: 		}
maedhros@6669: 	}
maedhros@6669: }
maedhros@6669: 
maedhros@6669: /**
maedhros@6669:  * Get the current snow line, either variable or static.
maedhros@6669:  * @return the snow line height.
maedhros@6669:  */
maedhros@6669: byte GetSnowLine(void)
maedhros@6669: {
rubidium@10775: 	if (_snow_line == NULL) return _settings_game.game_creation.snow_line;
maedhros@6669: 
maedhros@6669: 	YearMonthDay ymd;
maedhros@6669: 	ConvertDateToYMD(_date, &ymd);
maedhros@6669: 	return _snow_line->table[ymd.month][ymd.day];
maedhros@6669: }
maedhros@6669: 
maedhros@6669: /**
maedhros@6669:  * Get the highest possible snow line height, either variable or static.
maedhros@6669:  * @return the highest snow line height.
maedhros@6669:  */
maedhros@6669: byte HighestSnowLine(void)
maedhros@6669: {
rubidium@10775: 	return _snow_line == NULL ? _settings_game.game_creation.snow_line : _snow_line->highest_value;
maedhros@6669: }
maedhros@6669: 
maedhros@6669: /**
maedhros@6669:  * Clear the variable snow line table and free the memory.
maedhros@6669:  */
maedhros@6669: void ClearSnowLine(void)
maedhros@6669: {
maedhros@6669: 	free(_snow_line);
maedhros@6669: 	_snow_line = NULL;
maedhros@6669: }
maedhros@6669: 
Darkvater@1775: /** Clear a piece of landscape
tron@3491:  * @param tile tile to clear
belugas@6527:  * @param flags of operation to conduct
Darkvater@1775:  * @param p1 unused
Darkvater@1775:  * @param p2 unused
truelight@0:  */
rubidium@7439: CommandCost CmdLandscapeClear(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
truelight@0: {
tron@1214: 	return _tile_type_procs[GetTileType(tile)]->clear_tile_proc(tile, flags);
truelight@0: }
truelight@0: 
Darkvater@1793: /** Clear a big piece of landscape
tron@3491:  * @param tile end tile of area dragging
Darkvater@1793:  * @param p1 start tile of area dragging
belugas@6527:  * @param flags of operation to conduct
Darkvater@1793:  * @param p2 unused
Darkvater@1793:  */
rubidium@7439: CommandCost CmdClearArea(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
truelight@0: {
tron@2934: 	if (p1 >= MapSize()) return CMD_ERROR;
Darkvater@1793: 
belugas@6527: 	/* make sure sx,sy are smaller than ex,ey */
smatz@9313: 	int ex = TileX(tile);
smatz@9313: 	int ey = TileY(tile);
smatz@9313: 	int sx = TileX(p1);
smatz@9313: 	int sy = TileY(p1);
tron@6432: 	if (ex < sx) Swap(ex, sx);
tron@6432: 	if (ey < sy) Swap(ey, sy);
truelight@0: 
smatz@9313: 	Money money = GetAvailableMoneyForCommand();
smatz@9313: 	CommandCost cost(EXPENSES_CONSTRUCTION);
smatz@9313: 	bool success = false;
truelight@0: 
smatz@9313: 	for (int x = sx; x <= ex; ++x) {
smatz@9313: 		for (int y = sy; y <= ey; ++y) {
smatz@9313: 			CommandCost ret = DoCommand(TileXY(x, y), 0, 0, flags & ~DC_EXEC, CMD_LANDSCAPE_CLEAR);
Darkvater@1793: 			if (CmdFailed(ret)) continue;
truelight@0: 			success = true;
truelight@0: 
truelight@0: 			if (flags & DC_EXEC) {
smatz@9313: 				money -= ret.GetCost();
smatz@9313: 				if (ret.GetCost() > 0 && money < 0) {
rubidium@7446: 					_additional_cash_required = ret.GetCost();
rubidium@7446: 					return cost;
truelight@0: 				}
tron@3493: 				DoCommand(TileXY(x, y), 0, 0, flags, CMD_LANDSCAPE_CLEAR);
truelight@0: 
belugas@6527: 				/* draw explosion animation... */
Darkvater@1793: 				if ((x == sx || x == ex) && (y == sy || y == ey)) {
belugas@6527: 					/* big explosion in each corner, or small explosion for single tiles */
tron@3645: 					CreateEffectVehicleAbove(x * TILE_SIZE + TILE_SIZE / 2, y * TILE_SIZE + TILE_SIZE / 2, 2,
tron@1359: 						sy == ey && sx == ex ? EV_EXPLOSION_SMALL : EV_EXPLOSION_LARGE
tron@1359: 					);
truelight@0: 				}
truelight@0: 			}
rubidium@7446: 			cost.AddCost(ret);
truelight@0: 		}
truelight@0: 	}
truelight@0: 
Darkvater@1793: 	return (success) ? cost : CMD_ERROR;
truelight@0: }
truelight@0: 
truelight@0: 
rubidium@10233: TileIndex _cur_tileloop_tile;
truelight@0: #define TILELOOP_BITS 4
truelight@0: #define TILELOOP_SIZE (1 << TILELOOP_BITS)
rubidium@6987: #define TILELOOP_ASSERTMASK ((TILELOOP_SIZE - 1) + ((TILELOOP_SIZE - 1) << MapLogX()))
tron@927: #define TILELOOP_CHKMASK (((1 << (MapLogX() - TILELOOP_BITS))-1) << TILELOOP_BITS)
truelight@0: 
rubidium@6573: void RunTileLoop()
truelight@0: {
smatz@9313: 	TileIndex tile = _cur_tileloop_tile;
truelight@0: 
smatz@9313: 	assert((tile & ~TILELOOP_ASSERTMASK) == 0);
smatz@9313: 	uint count = (MapSizeX() / TILELOOP_SIZE) * (MapSizeY() / TILELOOP_SIZE);
truelight@0: 	do {
tron@1214: 		_tile_type_procs[GetTileType(tile)]->tile_loop_proc(tile);
truelight@0: 
tron@926: 		if (TileX(tile) < MapSizeX() - TILELOOP_SIZE) {
belugas@6527: 			tile += TILELOOP_SIZE; // no overflow
truelight@0: 		} else {
tron@1981: 			tile = TILE_MASK(tile - TILELOOP_SIZE * (MapSizeX() / TILELOOP_SIZE - 1) + TileDiffXY(0, TILELOOP_SIZE)); /* x would overflow, also increase y */
truelight@0: 		}
smatz@9313: 	} while (--count != 0);
smatz@9313: 	assert((tile & ~TILELOOP_ASSERTMASK) == 0);
truelight@0: 
truelight@0: 	tile += 9;
smatz@9313: 	if (tile & TILELOOP_CHKMASK) {
tron@863: 		tile = (tile + MapSizeX()) & TILELOOP_ASSERTMASK;
smatz@9313: 	}
truelight@0: 	_cur_tileloop_tile = tile;
truelight@0: }
truelight@0: 
rubidium@6573: void InitializeLandscape()
truelight@0: {
tron@3078: 	uint maxx = MapMaxX();
tron@3078: 	uint maxy = MapMaxY();
tron@3078: 	uint sizex = MapSizeX();
smatz@9313: 
tron@3078: 	uint y;
tron@3078: 	for (y = 0; y < maxy; y++) {
smatz@9313: 		uint x;
tron@3078: 		for (x = 0; x < maxx; x++) {
tron@3447: 			MakeClear(sizex * y + x, CLEAR_GRASS, 3);
tron@3078: 			SetTileHeight(sizex * y + x, 0);
frosch@8946: 			SetTropicZone(sizex * y + x, TROPICZONE_NORMAL);
celestar@5573: 			ClearBridgeMiddle(sizex * y + x);
tron@3078: 		}
tron@3078: 		MakeVoid(sizex * y + x);
tron@2049: 	}
smatz@9313: 	for (uint x = 0; x < sizex; x++) MakeVoid(sizex * y + x);
truelight@0: }
truelight@0: 
rubidium@4344: static const byte _genterrain_tbl_1[5] = { 10, 22, 33, 37, 4  };
rubidium@4344: static const byte _genterrain_tbl_2[5] = {  0,  0,  0,  0, 33 };
truelight@0: 
smatz@9313: static void GenerateTerrain(int type, uint flag)
truelight@0: {
smatz@9313: 	uint32 r = Random();
truelight@0: 
smatz@9313: 	const Sprite *templ = GetSprite((((r >> 24) * _genterrain_tbl_1[type]) >> 8) + _genterrain_tbl_2[type] + 4845);
truelight@0: 
smatz@9313: 	uint x = r & MapMaxX();
smatz@9313: 	uint y = (r >> MapLogX()) & MapMaxY();
truelight@0: 
tron@2951: 	if (x < 2 || y < 2) return;
truelight@0: 
smatz@9313: 	DiagDirection direction = (DiagDirection)GB(r, 22, 2);
smatz@9313: 	uint w = templ->width;
smatz@9313: 	uint h = templ->height;
truelight@0: 
smatz@9313: 	if (DiagDirToAxis(direction) == AXIS_Y) Swap(w, h);
smatz@9313: 
smatz@9313: 	const byte *p = templ->data;
smatz@9313: 
smatz@9313: 	if ((flag & 4) != 0) {
tron@1273: 		uint xw = x * MapSizeY();
tron@1273: 		uint yw = y * MapSizeX();
tron@1273: 		uint bias = (MapSizeX() + MapSizeY()) * 16;
tron@1273: 
tron@1273: 		switch (flag & 3) {
smatz@9313: 			default: NOT_REACHED();
tron@1273: 			case 0:
tron@1273: 				if (xw + yw > MapSize() - bias) return;
tron@1273: 				break;
tron@1273: 
tron@1273: 			case 1:
tron@1273: 				if (yw < xw + bias) return;
tron@1273: 				break;
tron@1273: 
tron@1273: 			case 2:
tron@1273: 				if (xw + yw < MapSize() + bias) return;
tron@1273: 				break;
tron@1273: 
tron@1273: 			case 3:
tron@1273: 				if (xw < yw + bias) return;
tron@1273: 				break;
truelight@0: 		}
truelight@0: 	}
truelight@0: 
tron@2951: 	if (x + w >= MapMaxX() - 1) return;
tron@2951: 	if (y + h >= MapMaxY() - 1) return;
truelight@0: 
smatz@9313: 	Tile *tile = &_m[TileXY(x, y)];
truelight@0: 
tron@1275: 	switch (direction) {
smatz@9313: 		default: NOT_REACHED();
smatz@9313: 		case DIAGDIR_NE:
truelight@0: 			do {
smatz@9313: 				Tile *tile_cur = tile;
tron@1275: 
smatz@9313: 				for (uint w_cur = w; w_cur != 0; --w_cur) {
tron@2049: 					if (*p >= tile_cur->type_height) tile_cur->type_height = *p;
tron@1275: 					p++;
tron@1275: 					tile_cur++;
tron@1275: 				}
tron@1981: 				tile += TileDiffXY(0, 1);
tron@1275: 			} while (--h != 0);
tron@1275: 			break;
tron@1275: 
smatz@9313: 		case DIAGDIR_SE:
truelight@0: 			do {
smatz@9313: 				Tile *tile_cur = tile;
tron@1275: 
smatz@9313: 				for (uint h_cur = h; h_cur != 0; --h_cur) {
tron@2049: 					if (*p >= tile_cur->type_height) tile_cur->type_height = *p;
tron@1275: 					p++;
tron@1981: 					tile_cur += TileDiffXY(0, 1);
tron@1275: 				}
smatz@9313: 				tile += TileDiffXY(1, 0);
tron@1275: 			} while (--w != 0);
tron@1275: 			break;
tron@1275: 
smatz@9313: 		case DIAGDIR_SW:
tron@1981: 			tile += TileDiffXY(w - 1, 0);
truelight@0: 			do {
smatz@9313: 				Tile *tile_cur = tile;
tron@1275: 
smatz@9313: 				for (uint w_cur = w; w_cur != 0; --w_cur) {
tron@2049: 					if (*p >= tile_cur->type_height) tile_cur->type_height = *p;
tron@1275: 					p++;
tron@1275: 					tile_cur--;
tron@1275: 				}
tron@1981: 				tile += TileDiffXY(0, 1);
tron@1275: 			} while (--h != 0);
tron@1275: 			break;
tron@1275: 
smatz@9313: 		case DIAGDIR_NW:
tron@1981: 			tile += TileDiffXY(0, h - 1);
tron@1275: 			do {
smatz@9313: 				Tile *tile_cur = tile;
tron@1275: 
smatz@9313: 				for (uint h_cur = h; h_cur != 0; --h_cur) {
tron@2049: 					if (*p >= tile_cur->type_height) tile_cur->type_height = *p;
tron@1275: 					p++;
tron@1981: 					tile_cur -= TileDiffXY(0, 1);
tron@1278: 				}
smatz@9313: 				tile += TileDiffXY(1, 0);
tron@1275: 			} while (--w != 0);
tron@1275: 			break;
truelight@0: 	}
truelight@0: }
truelight@0: 
truelight@0: 
truelight@0: #include "table/genland.h"
truelight@0: 
rubidium@6573: static void CreateDesertOrRainForest()
truelight@0: {
truelight@4300: 	TileIndex update_freq = MapSize() / 4;
tron@909: 	const TileIndexDiffC *data;
truelight@0: 
smatz@9313: 	for (TileIndex tile = 0; tile != MapSize(); ++tile) {
truelight@4300: 		if ((tile % update_freq) == 0) IncreaseGeneratingWorldProgress(GWP_LANDSCAPE);
truelight@4300: 
tron@909: 		for (data = _make_desert_or_rainforest_data;
tron@909: 				data != endof(_make_desert_or_rainforest_data); ++data) {
tron@1184: 			TileIndex t = TILE_MASK(tile + ToTileIndexDiff(*data));
tron@1044: 			if (TileHeight(t) >= 4 || IsTileType(t, MP_WATER)) break;
tron@909: 		}
tron@909: 		if (data == endof(_make_desert_or_rainforest_data))
belugas@3379: 			SetTropicZone(tile, TROPICZONE_DESERT);
tron@909: 	}
truelight@183: 
smatz@9313: 	for (uint i = 0; i != 256; i++) {
truelight@4300: 		if ((i % 64) == 0) IncreaseGeneratingWorldProgress(GWP_LANDSCAPE);
truelight@4300: 
truelight@0: 		RunTileLoop();
truelight@4300: 	}
truelight@0: 
smatz@9313: 	for (TileIndex tile = 0; tile != MapSize(); ++tile) {
truelight@4300: 		if ((tile % update_freq) == 0) IncreaseGeneratingWorldProgress(GWP_LANDSCAPE);
truelight@4300: 
tron@909: 		for (data = _make_desert_or_rainforest_data;
tron@909: 				data != endof(_make_desert_or_rainforest_data); ++data) {
tron@909: 			TileIndex t = TILE_MASK(tile + ToTileIndexDiff(*data));
tron@3447: 			if (IsTileType(t, MP_CLEAR) && IsClearGround(t, CLEAR_DESERT)) break;
tron@909: 		}
tron@909: 		if (data == endof(_make_desert_or_rainforest_data))
belugas@3379: 			SetTropicZone(tile, TROPICZONE_RAINFOREST);
tron@909: 	}
truelight@0: }
truelight@0: 
truelight@4300: void GenerateLandscape(byte mode)
truelight@0: {
smatz@9313: 	static const int gwp_desert_amount = 4 + 8;
truelight@183: 
truelight@4300: 	if (mode == GW_HEIGHTMAP) {
rubidium@10775: 		SetGeneratingWorldProgress(GWP_LANDSCAPE, (_settings_game.game_creation.landscape == LT_TROPIC) ? 1 + gwp_desert_amount : 1);
truelight@4300: 		LoadHeightmap(_file_to_saveload.name);
truelight@4300: 		IncreaseGeneratingWorldProgress(GWP_LANDSCAPE);
rubidium@10775: 	} else if (_settings_game.game_creation.land_generator == LG_TERRAGENESIS) {
rubidium@10775: 		SetGeneratingWorldProgress(GWP_LANDSCAPE, (_settings_game.game_creation.landscape == LT_TROPIC) ? 3 + gwp_desert_amount : 3);
truelight@4300: 		GenerateTerrainPerlin();
truelight@4300: 	} else {
rubidium@10775: 		switch (_settings_game.game_creation.landscape) {
smatz@9313: 			case LT_ARCTIC: {
truelight@4300: 				SetGeneratingWorldProgress(GWP_LANDSCAPE, 2);
truelight@0: 
smatz@9313: 				uint32 r = Random();
smatz@9313: 
smatz@9313: 				for (uint i = ScaleByMapSize(GB(r, 0, 7) + 950); i != 0; --i) {
truelight@4300: 					GenerateTerrain(2, 0);
truelight@4300: 				}
truelight@4300: 				IncreaseGeneratingWorldProgress(GWP_LANDSCAPE);
tron@3017: 
smatz@9313: 				uint flag = GB(r, 7, 2) | 4;
smatz@9313: 				for (uint i = ScaleByMapSize(GB(r, 9, 7) + 450); i != 0; --i) {
truelight@4300: 					GenerateTerrain(4, flag);
truelight@4300: 				}
truelight@4300: 				IncreaseGeneratingWorldProgress(GWP_LANDSCAPE);
smatz@9313: 			} break;
tron@3017: 
smatz@9313: 			case LT_TROPIC: {
truelight@4300: 				SetGeneratingWorldProgress(GWP_LANDSCAPE, 3 + gwp_desert_amount);
truelight@4300: 
smatz@9313: 				uint32 r = Random();
smatz@9313: 
smatz@9313: 				for (uint i = ScaleByMapSize(GB(r, 0, 7) + 170); i != 0; --i) {
truelight@4300: 					GenerateTerrain(0, 0);
truelight@4300: 				}
truelight@4300: 				IncreaseGeneratingWorldProgress(GWP_LANDSCAPE);
truelight@4300: 
smatz@9313: 				uint flag = GB(r, 7, 2) | 4;
smatz@9313: 				for (uint i = ScaleByMapSize(GB(r, 9, 8) + 1700); i != 0; --i) {
truelight@4300: 					GenerateTerrain(0, flag);
truelight@4300: 				}
truelight@4300: 				IncreaseGeneratingWorldProgress(GWP_LANDSCAPE);
truelight@4300: 
truelight@4300: 				flag ^= 2;
truelight@4300: 
smatz@9313: 				for (uint i = ScaleByMapSize(GB(r, 17, 7) + 410); i != 0; --i) {
truelight@4300: 					GenerateTerrain(3, flag);
truelight@4300: 				}
truelight@4300: 				IncreaseGeneratingWorldProgress(GWP_LANDSCAPE);
smatz@9313: 			} break;
truelight@4300: 
smatz@9313: 			default: {
truelight@4300: 				SetGeneratingWorldProgress(GWP_LANDSCAPE, 1);
truelight@4300: 
smatz@9313: 				uint32 r = Random();
smatz@9313: 
rubidium@10775: 				uint i = ScaleByMapSize(GB(r, 0, 7) + (3 - _settings_game.difficulty.quantity_sea_lakes) * 256 + 100);
truelight@4300: 				for (; i != 0; --i) {
rubidium@10775: 					GenerateTerrain(_settings_game.difficulty.terrain_type, 0);
truelight@4300: 				}
truelight@4300: 				IncreaseGeneratingWorldProgress(GWP_LANDSCAPE);
smatz@9313: 			} break;
truelight@4300: 		}
truelight@0: 	}
truelight@0: 
truelight@0: 	ConvertGroundTilesIntoWaterTiles();
truelight@0: 
rubidium@10775: 	if (_settings_game.game_creation.landscape == LT_TROPIC) CreateDesertOrRainForest();
truelight@0: }
truelight@0: 
rubidium@6573: void OnTick_Town();
rubidium@6573: void OnTick_Trees();
rubidium@6573: void OnTick_Station();
rubidium@6573: void OnTick_Industry();
truelight@0: 
rubidium@6573: void OnTick_Players();
rubidium@6573: void OnTick_Train();
truelight@0: 
rubidium@6573: void CallLandscapeTick()
truelight@0: {
truelight@0: 	OnTick_Town();
truelight@0: 	OnTick_Trees();
truelight@0: 	OnTick_Station();
truelight@0: 	OnTick_Industry();
truelight@0: 
truelight@0: 	OnTick_Players();
truelight@0: 	OnTick_Train();
truelight@0: }
truelight@0: 
truelight@0: TileIndex AdjustTileCoordRandomly(TileIndex a, byte rng)
truelight@0: {
truelight@0: 	int rn = rng;
truelight@0: 	uint32 r = Random();
truelight@0: 
tron@1981: 	return TILE_MASK(TileXY(
tron@2150: 		TileX(a) + (GB(r, 0, 8) * rn * 2 >> 8) - rn,
tron@2150: 		TileY(a) + (GB(r, 8, 8) * rn * 2 >> 8) - rn
tron@1174: 	));
truelight@0: }