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landscape.cpp
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landscape.cpp
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/*
* 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 landscape.cpp Functions related to the landscape (slopes etc.). */
/** @defgroup SnowLineGroup Snowline functions and data structures */
#include "stdafx.h"
#include "heightmap.h"
#include "clear_map.h"
#include "spritecache.h"
#include "viewport_func.h"
#include "command_func.h"
#include "landscape.h"
#include "void_map.h"
#include "tgp.h"
#include "genworld.h"
#include "fios.h"
#include "date_func.h"
#include "water.h"
#include "effectvehicle_func.h"
#include "landscape_type.h"
#include "animated_tile_func.h"
#include "core/random_func.hpp"
#include "object_base.h"
#include "company_func.h"
#include "pathfinder/npf/aystar.h"
#include "saveload/saveload.h"
#include "framerate_type.h"
#include <list>
#include <set>
#include "table/strings.h"
#include "table/sprites.h"
#include "safeguards.h"
extern const TileTypeProcs
_tile_type_clear_procs,
_tile_type_rail_procs,
_tile_type_road_procs,
_tile_type_town_procs,
_tile_type_trees_procs,
_tile_type_station_procs,
_tile_type_water_procs,
_tile_type_void_procs,
_tile_type_industry_procs,
_tile_type_tunnelbridge_procs,
_tile_type_object_procs;
/**
* Tile callback functions for each type of tile.
* @ingroup TileCallbackGroup
* @see TileType
*/
const TileTypeProcs * const _tile_type_procs[16] = {
&_tile_type_clear_procs, ///< Callback functions for MP_CLEAR tiles
&_tile_type_rail_procs, ///< Callback functions for MP_RAILWAY tiles
&_tile_type_road_procs, ///< Callback functions for MP_ROAD tiles
&_tile_type_town_procs, ///< Callback functions for MP_HOUSE tiles
&_tile_type_trees_procs, ///< Callback functions for MP_TREES tiles
&_tile_type_station_procs, ///< Callback functions for MP_STATION tiles
&_tile_type_water_procs, ///< Callback functions for MP_WATER tiles
&_tile_type_void_procs, ///< Callback functions for MP_VOID tiles
&_tile_type_industry_procs, ///< Callback functions for MP_INDUSTRY tiles
&_tile_type_tunnelbridge_procs, ///< Callback functions for MP_TUNNELBRIDGE tiles
&_tile_type_object_procs, ///< Callback functions for MP_OBJECT tiles
};
/** landscape slope => sprite */
extern const byte _slope_to_sprite_offset[32] = {
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 0,
0, 0, 0, 0, 0, 0, 0, 16, 0, 0, 0, 17, 0, 15, 18, 0,
};
/**
* Description of the snow line throughout the year.
*
* If it is \c nullptr, a static snowline height is used, as set by \c _settings_game.game_creation.snow_line_height.
* Otherwise it points to a table loaded from a newGRF file that describes the variable snowline.
* @ingroup SnowLineGroup
* @see GetSnowLine() GameCreationSettings
*/
static SnowLine *_snow_line = nullptr;
/**
* Map 2D viewport or smallmap coordinate to 3D world or tile coordinate.
* Function takes into account height of tiles and foundations.
*
* @param x X viewport 2D coordinate.
* @param y Y viewport 2D coordinate.
* @param clamp_to_map Clamp the coordinate outside of the map to the closest, non-void tile within the map.
* @param[out] clamped Whether coordinates were clamped.
* @return 3D world coordinate of point visible at the given screen coordinate (3D perspective).
*
* @note Inverse of #RemapCoords2 function. Smaller values may get rounded.
* @see InverseRemapCoords
*/
Point InverseRemapCoords2(int x, int y, bool clamp_to_map, bool *clamped)
{
if (clamped != nullptr) *clamped = false; // Not clamping yet.
/* Initial x/y world coordinate is like if the landscape
* was completely flat on height 0. */
Point pt = InverseRemapCoords(x, y);
const uint min_coord = _settings_game.construction.freeform_edges ? TILE_SIZE : 0;
const uint max_x = MapMaxX() * TILE_SIZE - 1;
const uint max_y = MapMaxY() * TILE_SIZE - 1;
if (clamp_to_map) {
/* Bring the coordinates near to a valid range. At the top we allow a number
* of extra tiles. This is mostly due to the tiles on the north side of
* the map possibly being drawn higher due to the extra height levels. */
int extra_tiles = CeilDiv(_settings_game.construction.max_heightlevel * TILE_HEIGHT, TILE_PIXELS);
Point old_pt = pt;
pt.x = Clamp(pt.x, -extra_tiles * TILE_SIZE, max_x);
pt.y = Clamp(pt.y, -extra_tiles * TILE_SIZE, max_y);
if (clamped != nullptr) *clamped = (pt.x != old_pt.x) || (pt.y != old_pt.y);
}
/* Now find the Z-world coordinate by fix point iteration.
* This is a bit tricky because the tile height is non-continuous at foundations.
* The clicked point should be approached from the back, otherwise there are regions that are not clickable.
* (FOUNDATION_HALFTILE_LOWER on SLOPE_STEEP_S hides north halftile completely)
* So give it a z-malus of 4 in the first iterations. */
int z = 0;
if (clamp_to_map) {
for (int i = 0; i < 5; i++) z = GetSlopePixelZ(Clamp(pt.x + max(z, 4) - 4, min_coord, max_x), Clamp(pt.y + max(z, 4) - 4, min_coord, max_y)) / 2;
for (int m = 3; m > 0; m--) z = GetSlopePixelZ(Clamp(pt.x + max(z, m) - m, min_coord, max_x), Clamp(pt.y + max(z, m) - m, min_coord, max_y)) / 2;
for (int i = 0; i < 5; i++) z = GetSlopePixelZ(Clamp(pt.x + z, min_coord, max_x), Clamp(pt.y + z, min_coord, max_y)) / 2;
} else {
for (int i = 0; i < 5; i++) z = GetSlopePixelZOutsideMap(pt.x + max(z, 4) - 4, pt.y + max(z, 4) - 4) / 2;
for (int m = 3; m > 0; m--) z = GetSlopePixelZOutsideMap(pt.x + max(z, m) - m, pt.y + max(z, m) - m) / 2;
for (int i = 0; i < 5; i++) z = GetSlopePixelZOutsideMap(pt.x + z, pt.y + z ) / 2;
}
pt.x += z;
pt.y += z;
if (clamp_to_map) {
Point old_pt = pt;
pt.x = Clamp(pt.x, min_coord, max_x);
pt.y = Clamp(pt.y, min_coord, max_y);
if (clamped != nullptr) *clamped = *clamped || (pt.x != old_pt.x) || (pt.y != old_pt.y);
}
return pt;
}
/**
* Applies a foundation to a slope.
*
* @pre Foundation and slope must be valid combined.
* @param f The #Foundation.
* @param s The #Slope to modify.
* @return Increment to the tile Z coordinate.
*/
uint ApplyFoundationToSlope(Foundation f, Slope *s)
{
if (!IsFoundation(f)) return 0;
if (IsLeveledFoundation(f)) {
uint dz = 1 + (IsSteepSlope(*s) ? 1 : 0);
*s = SLOPE_FLAT;
return dz;
}
if (f != FOUNDATION_STEEP_BOTH && IsNonContinuousFoundation(f)) {
*s = HalftileSlope(*s, GetHalftileFoundationCorner(f));
return 0;
}
if (IsSpecialRailFoundation(f)) {
*s = SlopeWithThreeCornersRaised(OppositeCorner(GetRailFoundationCorner(f)));
return 0;
}
uint dz = IsSteepSlope(*s) ? 1 : 0;
Corner highest_corner = GetHighestSlopeCorner(*s);
switch (f) {
case FOUNDATION_INCLINED_X:
*s = (((highest_corner == CORNER_W) || (highest_corner == CORNER_S)) ? SLOPE_SW : SLOPE_NE);
break;
case FOUNDATION_INCLINED_Y:
*s = (((highest_corner == CORNER_S) || (highest_corner == CORNER_E)) ? SLOPE_SE : SLOPE_NW);
break;
case FOUNDATION_STEEP_LOWER:
*s = SlopeWithOneCornerRaised(highest_corner);
break;
case FOUNDATION_STEEP_BOTH:
*s = HalftileSlope(SlopeWithOneCornerRaised(highest_corner), highest_corner);
break;
default: NOT_REACHED();
}
return dz;
}
/**
* Determines height at given coordinate of a slope
* @param x x coordinate
* @param y y coordinate
* @param corners slope to examine
* @return height of given point of given slope
*/
uint GetPartialPixelZ(int x, int y, Slope corners)
{
if (IsHalftileSlope(corners)) {
switch (GetHalftileSlopeCorner(corners)) {
case CORNER_W:
if (x - y >= 0) return GetSlopeMaxPixelZ(corners);
break;
case CORNER_S:
if (x - (y ^ 0xF) >= 0) return GetSlopeMaxPixelZ(corners);
break;
case CORNER_E:
if (y - x >= 0) return GetSlopeMaxPixelZ(corners);
break;
case CORNER_N:
if ((y ^ 0xF) - x >= 0) return GetSlopeMaxPixelZ(corners);
break;
default: NOT_REACHED();
}
}
int z = 0;
switch (RemoveHalftileSlope(corners)) {
case SLOPE_W:
if (x - y >= 0) {
z = (x - y) >> 1;
}
break;
case SLOPE_S:
y ^= 0xF;
if ((x - y) >= 0) {
z = (x - y) >> 1;
}
break;
case SLOPE_SW:
z = (x >> 1) + 1;
break;
case SLOPE_E:
if (y - x >= 0) {
z = (y - x) >> 1;
}
break;
case SLOPE_EW:
case SLOPE_NS:
case SLOPE_ELEVATED:
z = 4;
break;
case SLOPE_SE:
z = (y >> 1) + 1;
break;
case SLOPE_WSE:
z = 8;
y ^= 0xF;
if (x - y < 0) {
z += (x - y) >> 1;
}
break;
case SLOPE_N:
y ^= 0xF;
if (y - x >= 0) {
z = (y - x) >> 1;
}
break;
case SLOPE_NW:
z = (y ^ 0xF) >> 1;
break;
case SLOPE_NWS:
z = 8;
if (x - y < 0) {
z += (x - y) >> 1;
}
break;
case SLOPE_NE:
z = (x ^ 0xF) >> 1;
break;
case SLOPE_ENW:
z = 8;
y ^= 0xF;
if (y - x < 0) {
z += (y - x) >> 1;
}
break;
case SLOPE_SEN:
z = 8;
if (y - x < 0) {
z += (y - x) >> 1;
}
break;
case SLOPE_STEEP_S:
z = 1 + ((x + y) >> 1);
break;
case SLOPE_STEEP_W:
z = 1 + ((x + (y ^ 0xF)) >> 1);
break;
case SLOPE_STEEP_N:
z = 1 + (((x ^ 0xF) + (y ^ 0xF)) >> 1);
break;
case SLOPE_STEEP_E:
z = 1 + (((x ^ 0xF) + y) >> 1);
break;
default: break;
}
return z;
}
int GetSlopePixelZ(int x, int y)
{
TileIndex tile = TileVirtXY(x, y);
return _tile_type_procs[GetTileType(tile)]->get_slope_z_proc(tile, x, y);
}
/**
* Return world \c z coordinate of a given point of a tile,
* also for tiles outside the map (virtual "black" tiles).
*
* @param x World X coordinate in tile "units", may be outside the map.
* @param y World Y coordinate in tile "units", may be outside the map.
* @return World Z coordinate at tile ground level, including slopes and foundations.
*/
int GetSlopePixelZOutsideMap(int x, int y)
{
if (IsInsideBS(x, 0, MapSizeX() * TILE_SIZE) && IsInsideBS(y, 0, MapSizeY() * TILE_SIZE)) {
return GetSlopePixelZ(x, y);
} else {
return _tile_type_procs[MP_VOID]->get_slope_z_proc(INVALID_TILE, x, y);
}
}
/**
* Determine the Z height of a corner relative to TileZ.
*
* @pre The slope must not be a halftile slope.
*
* @param tileh The slope.
* @param corner The corner.
* @return Z position of corner relative to TileZ.
*/
int GetSlopeZInCorner(Slope tileh, Corner corner)
{
assert(!IsHalftileSlope(tileh));
return ((tileh & SlopeWithOneCornerRaised(corner)) != 0 ? 1 : 0) + (tileh == SteepSlope(corner) ? 1 : 0);
}
/**
* Determine the Z height of the corners of a specific tile edge
*
* @note If a tile has a non-continuous halftile foundation, a corner can have different heights wrt. its edges.
*
* @pre z1 and z2 must be initialized (typ. with TileZ). The corner heights just get added.
*
* @param tileh The slope of the tile.
* @param edge The edge of interest.
* @param z1 Gets incremented by the height of the first corner of the edge. (near corner wrt. the camera)
* @param z2 Gets incremented by the height of the second corner of the edge. (far corner wrt. the camera)
*/
void GetSlopePixelZOnEdge(Slope tileh, DiagDirection edge, int *z1, int *z2)
{
static const Slope corners[4][4] = {
/* corner | steep slope
* z1 z2 | z1 z2 */
{SLOPE_E, SLOPE_N, SLOPE_STEEP_E, SLOPE_STEEP_N}, // DIAGDIR_NE, z1 = E, z2 = N
{SLOPE_S, SLOPE_E, SLOPE_STEEP_S, SLOPE_STEEP_E}, // DIAGDIR_SE, z1 = S, z2 = E
{SLOPE_S, SLOPE_W, SLOPE_STEEP_S, SLOPE_STEEP_W}, // DIAGDIR_SW, z1 = S, z2 = W
{SLOPE_W, SLOPE_N, SLOPE_STEEP_W, SLOPE_STEEP_N}, // DIAGDIR_NW, z1 = W, z2 = N
};
int halftile_test = (IsHalftileSlope(tileh) ? SlopeWithOneCornerRaised(GetHalftileSlopeCorner(tileh)) : 0);
if (halftile_test == corners[edge][0]) *z2 += TILE_HEIGHT; // The slope is non-continuous in z2. z2 is on the upper side.
if (halftile_test == corners[edge][1]) *z1 += TILE_HEIGHT; // The slope is non-continuous in z1. z1 is on the upper side.
if ((tileh & corners[edge][0]) != 0) *z1 += TILE_HEIGHT; // z1 is raised
if ((tileh & corners[edge][1]) != 0) *z2 += TILE_HEIGHT; // z2 is raised
if (RemoveHalftileSlope(tileh) == corners[edge][2]) *z1 += TILE_HEIGHT; // z1 is highest corner of a steep slope
if (RemoveHalftileSlope(tileh) == corners[edge][3]) *z2 += TILE_HEIGHT; // z2 is highest corner of a steep slope
}
/**
* Get slope of a tile on top of a (possible) foundation
* If a tile does not have a foundation, the function returns the same as GetTileSlope.
*
* @param tile The tile of interest.
* @param z returns the z of the foundation slope. (Can be nullptr, if not needed)
* @return The slope on top of the foundation.
*/
Slope GetFoundationSlope(TileIndex tile, int *z)
{
Slope tileh = GetTileSlope(tile, z);
Foundation f = _tile_type_procs[GetTileType(tile)]->get_foundation_proc(tile, tileh);
uint z_inc = ApplyFoundationToSlope(f, &tileh);
if (z != nullptr) *z += z_inc;
return tileh;
}
bool HasFoundationNW(TileIndex tile, Slope slope_here, uint z_here)
{
int z;
int z_W_here = z_here;
int z_N_here = z_here;
GetSlopePixelZOnEdge(slope_here, DIAGDIR_NW, &z_W_here, &z_N_here);
Slope slope = GetFoundationPixelSlope(TILE_ADDXY(tile, 0, -1), &z);
int z_W = z;
int z_N = z;
GetSlopePixelZOnEdge(slope, DIAGDIR_SE, &z_W, &z_N);
return (z_N_here > z_N) || (z_W_here > z_W);
}
bool HasFoundationNE(TileIndex tile, Slope slope_here, uint z_here)
{
int z;
int z_E_here = z_here;
int z_N_here = z_here;
GetSlopePixelZOnEdge(slope_here, DIAGDIR_NE, &z_E_here, &z_N_here);
Slope slope = GetFoundationPixelSlope(TILE_ADDXY(tile, -1, 0), &z);
int z_E = z;
int z_N = z;
GetSlopePixelZOnEdge(slope, DIAGDIR_SW, &z_E, &z_N);
return (z_N_here > z_N) || (z_E_here > z_E);
}
/**
* Draw foundation \a f at tile \a ti. Updates \a ti.
* @param ti Tile to draw foundation on
* @param f Foundation to draw
*/
void DrawFoundation(TileInfo *ti, Foundation f)
{
if (!IsFoundation(f)) return;
/* Two part foundations must be drawn separately */
assert(f != FOUNDATION_STEEP_BOTH);
uint sprite_block = 0;
int z;
Slope slope = GetFoundationPixelSlope(ti->tile, &z);
/* Select the needed block of foundations sprites
* Block 0: Walls at NW and NE edge
* Block 1: Wall at NE edge
* Block 2: Wall at NW edge
* Block 3: No walls at NW or NE edge
*/
if (!HasFoundationNW(ti->tile, slope, z)) sprite_block += 1;
if (!HasFoundationNE(ti->tile, slope, z)) sprite_block += 2;
/* Use the original slope sprites if NW and NE borders should be visible */
SpriteID leveled_base = (sprite_block == 0 ? (int)SPR_FOUNDATION_BASE : (SPR_SLOPES_VIRTUAL_BASE + sprite_block * SPR_TRKFOUND_BLOCK_SIZE));
SpriteID inclined_base = SPR_SLOPES_VIRTUAL_BASE + SPR_SLOPES_INCLINED_OFFSET + sprite_block * SPR_TRKFOUND_BLOCK_SIZE;
SpriteID halftile_base = SPR_HALFTILE_FOUNDATION_BASE + sprite_block * SPR_HALFTILE_BLOCK_SIZE;
if (IsSteepSlope(ti->tileh)) {
if (!IsNonContinuousFoundation(f)) {
/* Lower part of foundation */
AddSortableSpriteToDraw(
leveled_base + (ti->tileh & ~SLOPE_STEEP), PAL_NONE, ti->x, ti->y, 16, 16, 7, ti->z
);
}
Corner highest_corner = GetHighestSlopeCorner(ti->tileh);
ti->z += ApplyPixelFoundationToSlope(f, &ti->tileh);
if (IsInclinedFoundation(f)) {
/* inclined foundation */
byte inclined = highest_corner * 2 + (f == FOUNDATION_INCLINED_Y ? 1 : 0);
AddSortableSpriteToDraw(inclined_base + inclined, PAL_NONE, ti->x, ti->y,
f == FOUNDATION_INCLINED_X ? 16 : 1,
f == FOUNDATION_INCLINED_Y ? 16 : 1,
TILE_HEIGHT, ti->z
);
OffsetGroundSprite(31, 9);
} else if (IsLeveledFoundation(f)) {
AddSortableSpriteToDraw(leveled_base + SlopeWithOneCornerRaised(highest_corner), PAL_NONE, ti->x, ti->y, 16, 16, 7, ti->z - TILE_HEIGHT);
OffsetGroundSprite(31, 1);
} else if (f == FOUNDATION_STEEP_LOWER) {
/* one corner raised */
OffsetGroundSprite(31, 1);
} else {
/* halftile foundation */
int x_bb = (((highest_corner == CORNER_W) || (highest_corner == CORNER_S)) ? 8 : 0);
int y_bb = (((highest_corner == CORNER_S) || (highest_corner == CORNER_E)) ? 8 : 0);
AddSortableSpriteToDraw(halftile_base + highest_corner, PAL_NONE, ti->x + x_bb, ti->y + y_bb, 8, 8, 7, ti->z + TILE_HEIGHT);
OffsetGroundSprite(31, 9);
}
} else {
if (IsLeveledFoundation(f)) {
/* leveled foundation */
AddSortableSpriteToDraw(leveled_base + ti->tileh, PAL_NONE, ti->x, ti->y, 16, 16, 7, ti->z);
OffsetGroundSprite(31, 1);
} else if (IsNonContinuousFoundation(f)) {
/* halftile foundation */
Corner halftile_corner = GetHalftileFoundationCorner(f);
int x_bb = (((halftile_corner == CORNER_W) || (halftile_corner == CORNER_S)) ? 8 : 0);
int y_bb = (((halftile_corner == CORNER_S) || (halftile_corner == CORNER_E)) ? 8 : 0);
AddSortableSpriteToDraw(halftile_base + halftile_corner, PAL_NONE, ti->x + x_bb, ti->y + y_bb, 8, 8, 7, ti->z);
OffsetGroundSprite(31, 9);
} else if (IsSpecialRailFoundation(f)) {
/* anti-zig-zag foundation */
SpriteID spr;
if (ti->tileh == SLOPE_NS || ti->tileh == SLOPE_EW) {
/* half of leveled foundation under track corner */
spr = leveled_base + SlopeWithThreeCornersRaised(GetRailFoundationCorner(f));
} else {
/* tile-slope = sloped along X/Y, foundation-slope = three corners raised */
spr = inclined_base + 2 * GetRailFoundationCorner(f) + ((ti->tileh == SLOPE_SW || ti->tileh == SLOPE_NE) ? 1 : 0);
}
AddSortableSpriteToDraw(spr, PAL_NONE, ti->x, ti->y, 16, 16, 7, ti->z);
OffsetGroundSprite(31, 9);
} else {
/* inclined foundation */
byte inclined = GetHighestSlopeCorner(ti->tileh) * 2 + (f == FOUNDATION_INCLINED_Y ? 1 : 0);
AddSortableSpriteToDraw(inclined_base + inclined, PAL_NONE, ti->x, ti->y,
f == FOUNDATION_INCLINED_X ? 16 : 1,
f == FOUNDATION_INCLINED_Y ? 16 : 1,
TILE_HEIGHT, ti->z
);
OffsetGroundSprite(31, 9);
}
ti->z += ApplyPixelFoundationToSlope(f, &ti->tileh);
}
}
void DoClearSquare(TileIndex tile)
{
/* If the tile can have animation and we clear it, delete it from the animated tile list. */
if (_tile_type_procs[GetTileType(tile)]->animate_tile_proc != nullptr) DeleteAnimatedTile(tile);
MakeClear(tile, CLEAR_GRASS, _generating_world ? 3 : 0);
MarkTileDirtyByTile(tile);
}
/**
* Returns information about trackdirs and signal states.
* If there is any trackbit at 'side', return all trackdirbits.
* For TRANSPORT_ROAD, return no trackbits if there is no roadbit (of given subtype) at given side.
* @param tile tile to get info about
* @param mode transport type
* @param sub_mode for TRANSPORT_ROAD, roadtypes to check
* @param side side we are entering from, INVALID_DIAGDIR to return all trackbits
* @return trackdirbits and other info depending on 'mode'
*/
TrackStatus GetTileTrackStatus(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
{
return _tile_type_procs[GetTileType(tile)]->get_tile_track_status_proc(tile, mode, sub_mode, side);
}
/**
* Change the owner of a tile
* @param tile Tile to change
* @param old_owner Current owner of the tile
* @param new_owner New owner of the tile
*/
void ChangeTileOwner(TileIndex tile, Owner old_owner, Owner new_owner)
{
_tile_type_procs[GetTileType(tile)]->change_tile_owner_proc(tile, old_owner, new_owner);
}
void GetTileDesc(TileIndex tile, TileDesc *td)
{
_tile_type_procs[GetTileType(tile)]->get_tile_desc_proc(tile, td);
}
/**
* Has a snow line table already been loaded.
* @return true if the table has been loaded already.
* @ingroup SnowLineGroup
*/
bool IsSnowLineSet()
{
return _snow_line != nullptr;
}
/**
* Set a variable snow line, as loaded from a newgrf file.
* @param table the 12 * 32 byte table containing the snowline for each day
* @ingroup SnowLineGroup
*/
void SetSnowLine(byte table[SNOW_LINE_MONTHS][SNOW_LINE_DAYS])
{
_snow_line = CallocT<SnowLine>(1);
_snow_line->lowest_value = 0xFF;
memcpy(_snow_line->table, table, sizeof(_snow_line->table));
for (uint i = 0; i < SNOW_LINE_MONTHS; i++) {
for (uint j = 0; j < SNOW_LINE_DAYS; j++) {
_snow_line->highest_value = max(_snow_line->highest_value, table[i][j]);
_snow_line->lowest_value = min(_snow_line->lowest_value, table[i][j]);
}
}
}
/**
* Get the current snow line, either variable or static.
* @return the snow line height.
* @ingroup SnowLineGroup
*/
byte GetSnowLine()
{
if (_snow_line == nullptr) return _settings_game.game_creation.snow_line_height;
YearMonthDay ymd;
ConvertDateToYMD(_date, &ymd);
return _snow_line->table[ymd.month][ymd.day];
}
/**
* Get the highest possible snow line height, either variable or static.
* @return the highest snow line height.
* @ingroup SnowLineGroup
*/
byte HighestSnowLine()
{
return _snow_line == nullptr ? _settings_game.game_creation.snow_line_height : _snow_line->highest_value;
}
/**
* Get the lowest possible snow line height, either variable or static.
* @return the lowest snow line height.
* @ingroup SnowLineGroup
*/
byte LowestSnowLine()
{
return _snow_line == nullptr ? _settings_game.game_creation.snow_line_height : _snow_line->lowest_value;
}
/**
* Clear the variable snow line table and free the memory.
* @ingroup SnowLineGroup
*/
void ClearSnowLine()
{
free(_snow_line);
_snow_line = nullptr;
}
/**
* Clear a piece of landscape
* @param tile tile to clear
* @param flags of operation to conduct
* @param p1 unused
* @param p2 unused
* @param text unused
* @return the cost of this operation or an error
*/
CommandCost CmdLandscapeClear(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
{
CommandCost cost(EXPENSES_CONSTRUCTION);
bool do_clear = false;
/* Test for stuff which results in water when cleared. Then add the cost to also clear the water. */
if ((flags & DC_FORCE_CLEAR_TILE) && HasTileWaterClass(tile) && IsTileOnWater(tile) && !IsWaterTile(tile) && !IsCoastTile(tile)) {
if ((flags & DC_AUTO) && GetWaterClass(tile) == WATER_CLASS_CANAL) return_cmd_error(STR_ERROR_MUST_DEMOLISH_CANAL_FIRST);
do_clear = true;
cost.AddCost(GetWaterClass(tile) == WATER_CLASS_CANAL ? _price[PR_CLEAR_CANAL] : _price[PR_CLEAR_WATER]);
}
Company *c = (flags & (DC_AUTO | DC_BANKRUPT)) ? nullptr : Company::GetIfValid(_current_company);
if (c != nullptr && (int)GB(c->clear_limit, 16, 16) < 1) {
return_cmd_error(STR_ERROR_CLEARING_LIMIT_REACHED);
}
const ClearedObjectArea *coa = FindClearedObject(tile);
/* If this tile was the first tile which caused object destruction, always
* pass it on to the tile_type_proc. That way multiple test runs and the exec run stay consistent. */
if (coa != nullptr && coa->first_tile != tile) {
/* If this tile belongs to an object which was already cleared via another tile, pretend it has been
* already removed.
* However, we need to check stuff, which is not the same for all object tiles. (e.g. being on water or not) */
/* If a object is removed, it leaves either bare land or water. */
if ((flags & DC_NO_WATER) && HasTileWaterClass(tile) && IsTileOnWater(tile)) {
return_cmd_error(STR_ERROR_CAN_T_BUILD_ON_WATER);
}
} else {
cost.AddCost(_tile_type_procs[GetTileType(tile)]->clear_tile_proc(tile, flags));
}
if (flags & DC_EXEC) {
if (c != nullptr) c->clear_limit -= 1 << 16;
if (do_clear) DoClearSquare(tile);
}
return cost;
}
/**
* Clear a big piece of landscape
* @param tile end tile of area dragging
* @param flags of operation to conduct
* @param p1 start tile of area dragging
* @param p2 various bitstuffed data.
* bit 0: Whether to use the Orthogonal (0) or Diagonal (1) iterator.
* @param text unused
* @return the cost of this operation or an error
*/
CommandCost CmdClearArea(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
{
if (p1 >= MapSize()) return CMD_ERROR;
Money money = GetAvailableMoneyForCommand();
CommandCost cost(EXPENSES_CONSTRUCTION);
CommandCost last_error = CMD_ERROR;
bool had_success = false;
const Company *c = (flags & (DC_AUTO | DC_BANKRUPT)) ? nullptr : Company::GetIfValid(_current_company);
int limit = (c == nullptr ? INT32_MAX : GB(c->clear_limit, 16, 16));
TileIterator *iter = HasBit(p2, 0) ? (TileIterator *)new DiagonalTileIterator(tile, p1) : new OrthogonalTileIterator(tile, p1);
for (; *iter != INVALID_TILE; ++(*iter)) {
TileIndex t = *iter;
CommandCost ret = DoCommand(t, 0, 0, flags & ~DC_EXEC, CMD_LANDSCAPE_CLEAR);
if (ret.Failed()) {
last_error = ret;
/* We may not clear more tiles. */
if (c != nullptr && GB(c->clear_limit, 16, 16) < 1) break;
continue;
}
had_success = true;
if (flags & DC_EXEC) {
money -= ret.GetCost();
if (ret.GetCost() > 0 && money < 0) {
_additional_cash_required = ret.GetCost();
delete iter;
return cost;
}
DoCommand(t, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
/* draw explosion animation...
* Disable explosions when game is paused. Looks silly and blocks the view. */
if ((t == tile || t == p1) && _pause_mode == PM_UNPAUSED) {
/* big explosion in two corners, or small explosion for single tiles */
CreateEffectVehicleAbove(TileX(t) * TILE_SIZE + TILE_SIZE / 2, TileY(t) * TILE_SIZE + TILE_SIZE / 2, 2,
TileX(tile) == TileX(p1) && TileY(tile) == TileY(p1) ? EV_EXPLOSION_SMALL : EV_EXPLOSION_LARGE
);
}
} else {
/* When we're at the clearing limit we better bail (unneed) testing as well. */
if (ret.GetCost() != 0 && --limit <= 0) break;
}
cost.AddCost(ret);
}
delete iter;
return had_success ? cost : last_error;
}
TileIndex _cur_tileloop_tile;
/**
* Gradually iterate over all tiles on the map, calling their TileLoopProcs once every 256 ticks.
*/
void RunTileLoop()
{
PerformanceAccumulator framerate(PFE_GL_LANDSCAPE);
/* The pseudorandom sequence of tiles is generated using a Galois linear feedback
* shift register (LFSR). This allows a deterministic pseudorandom ordering, but
* still with minimal state and fast iteration. */
/* Maximal length LFSR feedback terms, from 12-bit (for 64x64 maps) to 24-bit (for 4096x4096 maps).
* Extracted from http://www.ece.cmu.edu/~koopman/lfsr/ */
static const uint32 feedbacks[] = {
0xD8F, 0x1296, 0x2496, 0x4357, 0x8679, 0x1030E, 0x206CD, 0x403FE, 0x807B8, 0x1004B2, 0x2006A8, 0x4004B2, 0x800B87
};
assert_compile(lengthof(feedbacks) == 2 * MAX_MAP_SIZE_BITS - 2 * MIN_MAP_SIZE_BITS + 1);
const uint32 feedback = feedbacks[MapLogX() + MapLogY() - 2 * MIN_MAP_SIZE_BITS];
/* We update every tile every 256 ticks, so divide the map size by 2^8 = 256 */
uint count = 1 << (MapLogX() + MapLogY() - 8);
TileIndex tile = _cur_tileloop_tile;
/* The LFSR cannot have a zeroed state. */
assert(tile != 0);
/* Manually update tile 0 every 256 ticks - the LFSR never iterates over it itself. */
if (_tick_counter % 256 == 0) {
_tile_type_procs[GetTileType(0)]->tile_loop_proc(0);
count--;
}
while (count--) {
_tile_type_procs[GetTileType(tile)]->tile_loop_proc(tile);
/* Get the next tile in sequence using a Galois LFSR. */
tile = (tile >> 1) ^ (-(int32)(tile & 1) & feedback);
}
_cur_tileloop_tile = tile;
}
void InitializeLandscape()
{
for (uint y = _settings_game.construction.freeform_edges ? 1 : 0; y < MapMaxY(); y++) {
for (uint x = _settings_game.construction.freeform_edges ? 1 : 0; x < MapMaxX(); x++) {
MakeClear(TileXY(x, y), CLEAR_GRASS, 3);
SetTileHeight(TileXY(x, y), 0);
SetTropicZone(TileXY(x, y), TROPICZONE_NORMAL);
ClearBridgeMiddle(TileXY(x, y));
}
}
for (uint x = 0; x < MapSizeX(); x++) MakeVoid(TileXY(x, MapMaxY()));
for (uint y = 0; y < MapSizeY(); y++) MakeVoid(TileXY(MapMaxX(), y));
}
static const byte _genterrain_tbl_1[5] = { 10, 22, 33, 37, 4 };
static const byte _genterrain_tbl_2[5] = { 0, 0, 0, 0, 33 };
static void GenerateTerrain(int type, uint flag)
{
uint32 r = Random();
const Sprite *templ = GetSprite((((r >> 24) * _genterrain_tbl_1[type]) >> 8) + _genterrain_tbl_2[type] + 4845, ST_MAPGEN);
if (templ == nullptr) usererror("Map generator sprites could not be loaded");
uint x = r & MapMaxX();
uint y = (r >> MapLogX()) & MapMaxY();
if (x < 2 || y < 2) return;
DiagDirection direction = (DiagDirection)GB(r, 22, 2);
uint w = templ->width;
uint h = templ->height;
if (DiagDirToAxis(direction) == AXIS_Y) Swap(w, h);
const byte *p = templ->data;
if ((flag & 4) != 0) {
uint xw = x * MapSizeY();
uint yw = y * MapSizeX();
uint bias = (MapSizeX() + MapSizeY()) * 16;
switch (flag & 3) {
default: NOT_REACHED();
case 0:
if (xw + yw > MapSize() - bias) return;
break;
case 1:
if (yw < xw + bias) return;
break;
case 2:
if (xw + yw < MapSize() + bias) return;
break;
case 3:
if (xw < yw + bias) return;
break;
}
}
if (x + w >= MapMaxX() - 1) return;
if (y + h >= MapMaxY() - 1) return;
TileIndex tile = TileXY(x, y);
switch (direction) {
default: NOT_REACHED();
case DIAGDIR_NE:
do {
TileIndex tile_cur = tile;
for (uint w_cur = w; w_cur != 0; --w_cur) {
if (GB(*p, 0, 4) >= TileHeight(tile_cur)) SetTileHeight(tile_cur, GB(*p, 0, 4));
p++;
tile_cur++;
}
tile += TileDiffXY(0, 1);
} while (--h != 0);
break;
case DIAGDIR_SE:
do {
TileIndex tile_cur = tile;
for (uint h_cur = h; h_cur != 0; --h_cur) {
if (GB(*p, 0, 4) >= TileHeight(tile_cur)) SetTileHeight(tile_cur, GB(*p, 0, 4));
p++;
tile_cur += TileDiffXY(0, 1);
}
tile += TileDiffXY(1, 0);
} while (--w != 0);
break;
case DIAGDIR_SW:
tile += TileDiffXY(w - 1, 0);
do {
TileIndex tile_cur = tile;
for (uint w_cur = w; w_cur != 0; --w_cur) {
if (GB(*p, 0, 4) >= TileHeight(tile_cur)) SetTileHeight(tile_cur, GB(*p, 0, 4));
p++;
tile_cur--;
}
tile += TileDiffXY(0, 1);
} while (--h != 0);
break;
case DIAGDIR_NW:
tile += TileDiffXY(0, h - 1);
do {
TileIndex tile_cur = tile;
for (uint h_cur = h; h_cur != 0; --h_cur) {
if (GB(*p, 0, 4) >= TileHeight(tile_cur)) SetTileHeight(tile_cur, GB(*p, 0, 4));
p++;
tile_cur -= TileDiffXY(0, 1);
}
tile += TileDiffXY(1, 0);
} while (--w != 0);
break;
}
}
#include "table/genland.h"
static void CreateDesertOrRainForest()
{
TileIndex update_freq = MapSize() / 4;
const TileIndexDiffC *data;
uint max_desert_height = CeilDiv(_settings_game.construction.max_heightlevel, 4);
for (TileIndex tile = 0; tile != MapSize(); ++tile) {
if ((tile % update_freq) == 0) IncreaseGeneratingWorldProgress(GWP_LANDSCAPE);
if (!IsValidTile(tile)) continue;
for (data = _make_desert_or_rainforest_data;
data != endof(_make_desert_or_rainforest_data); ++data) {
TileIndex t = AddTileIndexDiffCWrap(tile, *data);
if (t != INVALID_TILE && (TileHeight(t) >= max_desert_height || IsTileType(t, MP_WATER))) break;
}
if (data == endof(_make_desert_or_rainforest_data)) {
SetTropicZone(tile, TROPICZONE_DESERT);
}
}
for (uint i = 0; i != 256; i++) {
if ((i % 64) == 0) IncreaseGeneratingWorldProgress(GWP_LANDSCAPE);
RunTileLoop();
}
for (TileIndex tile = 0; tile != MapSize(); ++tile) {
if ((tile % update_freq) == 0) IncreaseGeneratingWorldProgress(GWP_LANDSCAPE);
if (!IsValidTile(tile)) continue;