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(svn r22659) -Add: [NewGRF] Support for the land slope check callback for stations.

This commit is contained in:
michi_cc 2011-07-11 16:32:35 +00:00
parent e5dd6f9227
commit d579af11e8
7 changed files with 72 additions and 8 deletions
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2
src/newgrf_callbacks.h
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@ -211,7 +211,7 @@ enum CallbackID {
CBID_HOUSE_WATCHED_CARGO_ACCEPTED = 0x148, // 15 bit callback, not implemented
/** Callback done for each tile of a station to check the slope. */
CBID_STATION_LAND_SLOPE_CHECK = 0x149, // 15 bit callback, not implemented
CBID_STATION_LAND_SLOPE_CHECK = 0x149, // 15 bit callback
/** Called to determine the colour of an industry. */
CBID_INDUSTRY_DECIDE_COLOUR = 0x14A, // 4 bit callback

6
src/newgrf_commons.cpp
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@ -413,9 +413,10 @@ uint32 GetTerrainType(TileIndex tile, TileContext context)
* @param parameter The NewGRF "encoded" offset.
* @param tile The tile to base the offset from.
* @param signed_offsets Whether the offsets are to be interpreted as signed or not.
* @param axis Axis of a railways station.
* @return The tile at the offset.
*/
TileIndex GetNearbyTile(byte parameter, TileIndex tile, bool signed_offsets)
TileIndex GetNearbyTile(byte parameter, TileIndex tile, bool signed_offsets, Axis axis)
{
int8 x = GB(parameter, 0, 4);
int8 y = GB(parameter, 4, 4);
@ -424,7 +425,8 @@ TileIndex GetNearbyTile(byte parameter, TileIndex tile, bool signed_offsets)
if (signed_offsets && y >= 8) y -= 16;
/* Swap width and height depending on axis for railway stations */
if (HasStationTileRail(tile) && GetRailStationAxis(tile) == AXIS_Y) Swap(x, y);
if (axis == INVALID_AXIS && HasStationTileRail(tile)) axis = GetRailStationAxis(tile);
if (axis == AXIS_Y) Swap(x, y);
/* Make sure we never roam outside of the map, better wrap in that case */
return TILE_MASK(tile + TileDiffXY(x, y));

3
src/newgrf_commons.h
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@ -20,6 +20,7 @@
#include "core/alloc_type.hpp"
#include "core/smallvec_type.hpp"
#include "command_type.h"
#include "direction_type.h"
/** Context for tile accesses */
enum TileContext {
@ -266,7 +267,7 @@ extern AirportTileOverrideManager _airporttile_mngr;
extern ObjectOverrideManager _object_mngr;
uint32 GetTerrainType(TileIndex tile, TileContext context = TCX_NORMAL);
TileIndex GetNearbyTile(byte parameter, TileIndex tile, bool signed_offsets = true);
TileIndex GetNearbyTile(byte parameter, TileIndex tile, bool signed_offsets = true, Axis axis = INVALID_AXIS);
uint32 GetNearbyTileInformation(TileIndex tile);
CommandCost GetErrorMessageFromLocationCallbackResult(uint16 cb_res, uint32 grfid, StringID default_error);

1
src/newgrf_spritegroup.h
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@ -334,6 +334,7 @@ struct ResolverObject {
struct BaseStation *st;
const struct StationSpec *statspec;
CargoID cargo_type;
Axis axis; ///< Station axis, used only for the slope check callback.
} station;
struct {
TileIndex tile;

47
src/newgrf_station.cpp
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@ -279,7 +279,7 @@ static uint32 StationGetVariable(const ResolverObject *object, byte variable, by
}
if (st == NULL) {
/* Station does not exist, so we're in a purchase list */
/* Station does not exist, so we're in a purchase list or the land slope check callback. */
switch (variable) {
case 0x40:
case 0x41:
@ -289,6 +289,17 @@ static uint32 StationGetVariable(const ResolverObject *object, byte variable, by
case 0x42: return 0; // Rail type (XXX Get current type from GUI?)
case 0x43: return _current_company; // Station owner
case 0x44: return 2; // PBS status
case 0x67: // Land info of nearby tile
if (object->u.station.axis != INVALID_AXIS && tile != INVALID_TILE) {
if (parameter != 0) tile = GetNearbyTile(parameter, tile, true, object->u.station.axis); // only perform if it is required
Slope tileh = GetTileSlope(tile, NULL);
bool swap = (object->u.station.axis == AXIS_Y && HasBit(tileh, CORNER_W) != HasBit(tileh, CORNER_E));
return GetNearbyTileInformation(tile) ^ (swap ? SLOPE_EW : 0);
}
break;
case 0xFA: return Clamp(_date - DAYS_TILL_ORIGINAL_BASE_YEAR, 0, 65535); // Build date, clamped to a 16 bit value
}
@ -544,6 +555,7 @@ static void NewStationResolver(ResolverObject *res, const StationSpec *statspec,
res->u.station.st = st;
res->u.station.statspec = statspec;
res->u.station.tile = tile;
res->u.station.axis = INVALID_AXIS;
res->callback = CBID_NO_CALLBACK;
res->callback_param1 = 0;
@ -653,6 +665,39 @@ uint16 GetStationCallback(CallbackID callback, uint32 param1, uint32 param2, con
return group->GetCallbackResult();
}
/**
* Check the slope of a tile of a new station.
* @param north_tile Norther tile of the station rect.
* @param cur_tile Tile to check.
* @param statspec Station spec.
* @param axis Axis of the new station.
* @param plat_len Platform length.
* @param numtracks Number of platforms.
* @return Succeeded or failed command.
*/
CommandCost PerformStationTileSlopeCheck(TileIndex north_tile, TileIndex cur_tile, const StationSpec *statspec, Axis axis, byte plat_len, byte numtracks)
{
TileIndexDiff diff = cur_tile - north_tile;
Slope slope = GetTileSlope(cur_tile, NULL);
ResolverObject object;
NewStationResolver(&object, statspec, NULL, cur_tile);
object.callback = CBID_STATION_LAND_SLOPE_CHECK;
object.callback_param1 = slope << 4 | slope ^ (axis == AXIS_Y && HasBit(slope, CORNER_W) != HasBit(slope, CORNER_E) ? SLOPE_EW : 0);
object.callback_param2 = numtracks << 24 | plat_len << 16 | (axis == AXIS_Y ? TileX(diff) << 8 | TileY(diff) : TileY(diff) << 8 | TileX(diff));
object.u.station.axis = axis;
const SpriteGroup *group = ResolveStation(&object);
uint16 cb_res = group != NULL ? group->GetCallbackResult() : CALLBACK_FAILED;
/* Failed callback means success. */
if (cb_res == CALLBACK_FAILED) return CommandCost();
/* The meaning of bit 10 is inverted in the result of this callback. */
return GetErrorMessageFromLocationCallbackResult(ToggleBit(cb_res, 10), statspec->grf_prop.grffile->grfid, STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
}
/**
* Allocate a StationSpec to a Station. This is called once per build operation.

1
src/newgrf_station.h
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@ -114,6 +114,7 @@ uint32 GetPlatformInfo(Axis axis, byte tile, int platforms, int length, int x, i
SpriteID GetCustomStationRelocation(const StationSpec *statspec, BaseStation *st, TileIndex tile, uint32 var10 = 0);
SpriteID GetCustomStationFoundationRelocation(const StationSpec *statspec, BaseStation *st, TileIndex tile, uint layout, uint edge_info);
uint16 GetStationCallback(CallbackID callback, uint32 param1, uint32 param2, const StationSpec *statspec, BaseStation *st, TileIndex tile);
CommandCost PerformStationTileSlopeCheck(TileIndex north_tile, TileIndex cur_tile, const StationSpec *statspec, Axis axis, byte plat_len, byte numtracks);
/* Allocate a StationSpec to a Station. This is called once per build operation. */
int AllocateSpecToStation(const StationSpec *statspec, BaseStation *st, bool exec);

20
src/station_cmd.cpp
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@ -749,22 +749,36 @@ CommandCost CheckFlatLand(TileArea tile_area, DoCommandFlag flags)
* Checks if a rail station can be built at the given area.
* @param tile_area Area to check.
* @param flags Operation to perform.
* @param invalid_dirs Prohibited directions (set of #DiagDirection).
* @param axis Rail station axis.
* @param station StationID to be queried and returned if available.
* @param rt The rail type to check for (overbuilding rail stations over rail).
* @param affected_vehicles List of trains with PBS reservations on the tiles
* @param spec_class Station class.
* @param spec_index Index into the station class.
* @param plat_len Platform length.
* @param numtracks Number of platforms.
* @return The cost in case of success, or an error code if it failed.
*/
static CommandCost CheckFlatLandRailStation(TileArea tile_area, DoCommandFlag flags, uint invalid_dirs, StationID *station, RailType rt, SmallVector<Train *, 4> &affected_vehicles)
static CommandCost CheckFlatLandRailStation(TileArea tile_area, DoCommandFlag flags, Axis axis, StationID *station, RailType rt, SmallVector<Train *, 4> &affected_vehicles, StationClassID spec_class, byte spec_index, byte plat_len, byte numtracks)
{
CommandCost cost(EXPENSES_CONSTRUCTION);
int allowed_z = -1;
uint invalid_dirs = 5 << axis;
const StationSpec *statspec = StationClass::Get(spec_class, spec_index);
bool slope_cb = statspec != NULL && HasBit(statspec->callback_mask, CBM_STATION_SLOPE_CHECK);
TILE_AREA_LOOP(tile_cur, tile_area) {
CommandCost ret = CheckBuildableTile(tile_cur, invalid_dirs, allowed_z);
if (ret.Failed()) return ret;
cost.AddCost(ret);
if (slope_cb) {
/* Do slope check if requested. */
ret = PerformStationTileSlopeCheck(tile_area.tile, tile_cur, statspec, axis, plat_len, numtracks);
if (ret.Failed()) return ret;
}
/* if station is set, then we have special handling to allow building on top of already existing stations.
* so station points to INVALID_STATION if we can build on any station.
* Or it points to a station if we're only allowed to build on exactly that station. */
@ -1140,7 +1154,7 @@ CommandCost CmdBuildRailStation(TileIndex tile_org, DoCommandFlag flags, uint32
StationID est = INVALID_STATION;
SmallVector<Train *, 4> affected_vehicles;
/* Clear the land below the station. */
CommandCost cost = CheckFlatLandRailStation(TileArea(tile_org, w_org, h_org), flags, 5 << axis, &est, rt, affected_vehicles);
CommandCost cost = CheckFlatLandRailStation(TileArea(tile_org, w_org, h_org), flags, axis, &est, rt, affected_vehicles, spec_class, spec_index, plat_len, numtracks);
if (cost.Failed()) return cost;
/* Add construction expenses. */
cost.AddCost((numtracks * _price[PR_BUILD_STATION_RAIL] + _price[PR_BUILD_STATION_RAIL_LENGTH]) * plat_len);