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openttd/newgrf_station.c

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/* $Id$ */
/** @file newgrf_station.c Functions for dealing with station classes and custom stations. */
#include "stdafx.h"
#include "openttd.h"
#include "variables.h"
#include "functions.h"
#include "debug.h"
#include "sprite.h"
#include "table/sprites.h"
#include "table/strings.h"
#include "station.h"
#include "station_map.h"
#include "newgrf_callbacks.h"
#include "newgrf_station.h"
#include "newgrf_spritegroup.h"
static StationClass station_classes[STAT_CLASS_MAX];
enum {
MAX_SPECLIST = 255,
};
/**
* Reset station classes to their default state.
* This includes initialising the Default and Waypoint classes with an empty
* entry, for standard stations and waypoints.
*/
void ResetStationClasses(void)
{
StationClassID i;
for (i = 0; i < STAT_CLASS_MAX; i++) {
station_classes[i].id = 0;
station_classes[i].name = STR_EMPTY;
station_classes[i].stations = 0;
free(station_classes[i].spec);
station_classes[i].spec = NULL;
}
// Set up initial data
station_classes[0].id = 'DFLT';
station_classes[0].name = STR_STAT_CLASS_DFLT;
station_classes[0].stations = 1;
station_classes[0].spec = malloc(sizeof(*station_classes[0].spec));
station_classes[0].spec[0] = NULL;
station_classes[1].id = 'WAYP';
station_classes[1].name = STR_STAT_CLASS_WAYP;
station_classes[1].stations = 1;
station_classes[1].spec = malloc(sizeof(*station_classes[1].spec));
station_classes[1].spec[0] = NULL;
}
/**
* Allocate a station class for the given class id.
* @param classid A 32 bit value identifying the class.
* @return Index into station_classes of allocated class.
*/
StationClassID AllocateStationClass(uint32 class)
{
StationClassID i;
for (i = 0; i < STAT_CLASS_MAX; i++) {
if (station_classes[i].id == class) {
// ClassID is already allocated, so reuse it.
return i;
} else if (station_classes[i].id == 0) {
// This class is empty, so allocate it to the ClassID.
station_classes[i].id = class;
return i;
}
}
DEBUG(grf, 2)("StationClassAllocate: Already allocated %d classes, using default.", STAT_CLASS_MAX);
return STAT_CLASS_DFLT;
}
/** Set the name of a custom station class */
void SetStationClassName(StationClassID sclass, StringID name)
{
assert(sclass < STAT_CLASS_MAX);
station_classes[sclass].name = name;
}
/** Retrieve the name of a custom station class */
StringID GetStationClassName(StationClassID sclass)
{
assert(sclass < STAT_CLASS_MAX);
return station_classes[sclass].name;
}
/** Build a list of station class name StringIDs to use in a dropdown list
* @return Pointer to a (static) array of StringIDs
*/
StringID *BuildStationClassDropdown(void)
{
/* Allow room for all station classes, plus a terminator entry */
static StringID names[STAT_CLASS_MAX + 1];
uint i;
/* Add each name */
for (i = 0; i < STAT_CLASS_MAX && station_classes[i].id != 0; i++) {
names[i] = station_classes[i].name;
}
/* Terminate the list */
names[i] = INVALID_STRING_ID;
return names;
}
/**
* Get the number of station classes in use.
* @return Number of station classes.
*/
uint GetNumStationClasses(void)
{
uint i;
for (i = 0; i < STAT_CLASS_MAX && station_classes[i].id != 0; i++);
return i;
}
/**
* Return the number of stations for the given station class.
* @param sclass Index of the station class.
* @return Number of stations in the class.
*/
uint GetNumCustomStations(StationClassID sclass)
{
assert(sclass < STAT_CLASS_MAX);
return station_classes[sclass].stations;
}
/**
* Tie a station spec to its station class.
* @param spec The station spec.
*/
void SetCustomStationSpec(StationSpec *statspec)
{
StationClass *station_class;
int i;
/* If the station has already been allocated, don't reallocate it. */
if (statspec->allocated) return;
assert(statspec->sclass < STAT_CLASS_MAX);
station_class = &station_classes[statspec->sclass];
i = station_class->stations++;
station_class->spec = realloc(station_class->spec, station_class->stations * sizeof(*station_class->spec));
station_class->spec[i] = statspec;
statspec->allocated = true;
}
/**
* Retrieve a station spec from a class.
* @param sclass Index of the station class.
* @param station The station index with the class.
* @return The station spec.
*/
const StationSpec *GetCustomStationSpec(StationClassID sclass, uint station)
{
assert(sclass < STAT_CLASS_MAX);
if (station < station_classes[sclass].stations)
return station_classes[sclass].spec[station];
// If the custom station isn't defined any more, then the GRF file
// probably was not loaded.
return NULL;
}
const StationSpec *GetCustomStationSpecByGrf(uint32 grfid, byte localidx)
{
StationClassID i;
uint j;
for (i = STAT_CLASS_DFLT; i < STAT_CLASS_MAX; i++) {
for (j = 0; j < station_classes[i].stations; j++) {
const StationSpec *statspec = station_classes[i].spec[j];
if (statspec == NULL) continue;
if (statspec->grfid == grfid && statspec->localidx == localidx) return statspec;
}
}
return NULL;
}
/* Evaluate a tile's position within a station, and return the result a bitstuffed format.
* if not centred: .TNLcCpP, if centred: .TNL..CP
* T = Tile layout number (GetStationGfx), N = Number of platforms, L = Length of platforms
* C = Current platform number from start, c = from end
* P = Position along platform from start, p = from end
* if centred, C/P start from the centre and c/p are not available.
*/
uint32 GetPlatformInfo(Axis axis, byte tile, int platforms, int length, int x, int y, bool centred)
{
uint32 retval = 0;
if (axis == AXIS_X) {
intswap(platforms, length);
intswap(x, y);
}
/* Limit our sizes to 4 bits */
platforms = min(15, platforms);
length = min(15, length);
x = min(15, x);
y = min(15, y);
if (centred) {
x -= platforms / 2;
y -= length / 2;
SB(retval, 0, 4, y & 0xF);
SB(retval, 4, 4, x & 0xF);
} else {
SB(retval, 0, 4, y);
SB(retval, 4, 4, length - y - 1);
SB(retval, 8, 4, x);
SB(retval, 12, 4, platforms - x - 1);
}
SB(retval, 16, 4, length);
SB(retval, 20, 4, platforms);
SB(retval, 24, 4, tile);
return retval;
}
/* Find the end of a railway station, from the tile, in the direction of delta.
* If check_type is set, we stop if the custom station type changes.
* If check_axis is set, we stop if the station direction changes.
*/
static TileIndex FindRailStationEnd(TileIndex tile, TileIndexDiff delta, bool check_type, bool check_axis)
{
bool waypoint;
byte orig_type = 0;
Axis orig_axis = AXIS_X;
waypoint = IsTileType(tile, MP_RAILWAY);
if (waypoint) {
if (check_axis) orig_axis = GetWaypointAxis(tile);
} else {
if (check_type) orig_type = GetCustomStationSpecIndex(tile);
if (check_axis) orig_axis = GetRailStationAxis(tile);
}
while (true) {
TileIndex new_tile = TILE_ADD(tile, delta);
if (waypoint) {
if (!IsTileType(new_tile, MP_RAILWAY)) break;
if (GetRailTileType(new_tile) != RAIL_TILE_DEPOT_WAYPOINT) break;
if (GetRailTileSubtype(new_tile) != RAIL_SUBTYPE_WAYPOINT) break;
if (check_axis && GetWaypointAxis(new_tile) != orig_axis) break;
} else {
if (!IsRailwayStationTile(new_tile)) break;
if (check_type && GetCustomStationSpecIndex(new_tile) != orig_type) break;
if (check_axis && GetRailStationAxis(new_tile) != orig_axis) break;
}
tile = new_tile;
}
return tile;
}
static uint32 GetPlatformInfoHelper(TileIndex tile, bool check_type, bool check_axis, bool centred)
{
int tx = TileX(tile);
int ty = TileY(tile);
int sx = TileX(FindRailStationEnd(tile, TileDiffXY(-1, 0), check_type, check_axis));
int sy = TileY(FindRailStationEnd(tile, TileDiffXY( 0, -1), check_type, check_axis));
int ex = TileX(FindRailStationEnd(tile, TileDiffXY( 1, 0), check_type, check_axis)) + 1;
int ey = TileY(FindRailStationEnd(tile, TileDiffXY( 0, 1), check_type, check_axis)) + 1;
Axis axis = IsTileType(tile, MP_RAILWAY) ? GetWaypointAxis(tile) : GetRailStationAxis(tile);
tx -= sx; ex -= sx;
ty -= sy; ey -= sy;
return GetPlatformInfo(axis, IsTileType(tile, MP_RAILWAY) ? 2 : GetStationGfx(tile), ex, ey, tx, ty, centred);
}
/* Station Resolver Functions */
static uint32 StationGetRandomBits(const ResolverObject *object)
{
const Station *st = object->u.station.st;
const TileIndex tile = object->u.station.tile;
return (st == NULL ? 0 : st->random_bits) | (tile == INVALID_TILE ? 0 : GetStationTileRandomBits(tile) << 16);
}
static uint32 StationGetTriggers(const ResolverObject *object)
{
const Station *st = object->u.station.st;
return st == NULL ? 0 : st->waiting_triggers;
}
static void StationSetTriggers(const ResolverObject *object, int triggers)
{
Station *st = (Station*)object->u.station.st;
assert(st != NULL);
st->waiting_triggers = triggers;
}
static uint32 StationGetVariable(const ResolverObject *object, byte variable, byte parameter, bool *available)
{
const Station *st = object->u.station.st;
TileIndex tile = object->u.station.tile;
if (st == NULL) {
/* Station does not exist, so we're in a purchase list */
switch (variable) {
case 0x40:
case 0x41:
case 0x46:
case 0x47:
case 0x49: return 0x2110000; /* Platforms, tracks & position */
case 0x42: return 0; /* Rail type (XXX Get current type from GUI?) */
case 0x43: return _current_player; /* Station owner */
case 0x44: return 2; /* PBS status */
case 0xFA: return _date; /* Build date */
}
*available = false;
return -1;
}
switch (variable) {
/* Calculated station variables */
case 0x40: return GetPlatformInfoHelper(tile, false, false, false);
case 0x41: return GetPlatformInfoHelper(tile, true, false, false);
case 0x42: /* Terrain and rail type */
return ((_opt.landscape == LT_HILLY && GetTileZ(tile) > _opt.snow_line) ? 4 : 0) |
(GetRailType(tile) << 8);
case 0x43: return st->owner; /* Station owner */
case 0x44: return 2; /* PBS status */
case 0x46: return GetPlatformInfoHelper(tile, false, false, true);
case 0x47: return GetPlatformInfoHelper(tile, true, false, true);
case 0x48: { /* Accepted cargo types */
CargoID cargo_type;
uint32 value = 0;
for (cargo_type = 0; cargo_type < NUM_CARGO; cargo_type++) {
if (HASBIT(st->goods[cargo_type].waiting_acceptance, 15)) SETBIT(value, cargo_type);
}
return value;
}
case 0x49: return GetPlatformInfoHelper(tile, false, true, false);
/* Variables which use the parameter */
case 0x60: return GB(st->goods[parameter].waiting_acceptance, 0, 12);
case 0x61: return st->goods[parameter].days_since_pickup;
case 0x62: return st->goods[parameter].rating;
case 0x63: return st->goods[parameter].enroute_time;
case 0x64: return st->goods[parameter].last_speed | (st->goods[parameter].last_age << 8);
/* General station properties */
case 0x82: return 50;
case 0x84: return st->string_id;
case 0x86: return 0;
case 0x8A: return st->had_vehicle_of_type;
case 0xF0: return st->facilities;
case 0xF1: return st->airport_type;
case 0xF2: return st->truck_stops->status;
case 0xF3: return st->bus_stops->status;
case 0xF6: return st->airport_flags;
case 0xF7: return st->airport_flags & 0xFF;
case 0xFA: return st->build_date;
}
/* Handle cargo variables (deprecated) */
if (variable >= 0x8C && variable <= 0xEC) {
const GoodsEntry *g = &st->goods[GB(variable - 0x8C, 3, 4)];
switch (GB(variable - 0x8C, 0, 3)) {
case 0: return g->waiting_acceptance;
case 1: return g->waiting_acceptance & 0xFF;
case 2: return g->days_since_pickup;
case 3: return g->rating;
case 4: return g->enroute_from;
case 5: return g->enroute_time;
case 6: return g->last_speed;
case 7: return g->last_age;
}
}
DEBUG(grf, 1)("Unhandled station property 0x%X", variable);
*available = false;
return -1;
}
static const SpriteGroup *StationResolveReal(const ResolverObject *object, const SpriteGroup *group)
{
const Station *st = object->u.station.st;
const StationSpec *statspec = object->u.station.statspec;
uint set;
uint cargo = 0;
CargoID cargo_type = CT_INVALID; /* XXX Pick the correct cargo type */
if (st == NULL || statspec->sclass == STAT_CLASS_WAYP) {
return group->g.real.loading[0];
}
if (cargo_type == CT_INVALID) {
for (cargo_type = 0; cargo_type < NUM_CARGO; cargo_type++) {
cargo += GB(st->goods[cargo_type].waiting_acceptance, 0, 12);
}
} else {
cargo = GB(st->goods[cargo_type].waiting_acceptance, 0, 12);
}
if (HASBIT(statspec->flags, 1)) cargo /= (st->trainst_w + st->trainst_h);
cargo = min(0xfff, cargo);
if (cargo > statspec->cargo_threshold) {
if (group->g.real.num_loading > 0) {
set = ((cargo - statspec->cargo_threshold) * group->g.real.num_loading) / (4096 - statspec->cargo_threshold);
return group->g.real.loading[set];
}
} else {
if (group->g.real.num_loaded > 0) {
set = (cargo * group->g.real.num_loaded) / (statspec->cargo_threshold + 1);
return group->g.real.loaded[set];
}
}
return group->g.real.loading[0];
}
static void NewStationResolver(ResolverObject *res, const StationSpec *statspec, const Station *st, TileIndex tile)
{
res->GetRandomBits = StationGetRandomBits;
res->GetTriggers = StationGetTriggers;
res->SetTriggers = StationSetTriggers;
res->GetVariable = StationGetVariable;
res->ResolveReal = StationResolveReal;
res->u.station.st = st;
res->u.station.statspec = statspec;
res->u.station.tile = tile;
res->callback = 0;
res->callback_param1 = 0;
res->callback_param2 = 0;
res->last_value = 0;
res->trigger = 0;
res->reseed = 0;
}
SpriteID GetCustomStationRelocation(const StationSpec *statspec, const Station *st, TileIndex tile)
{
const SpriteGroup *group;
ResolverObject object;
CargoID ctype = (st == NULL) ? GC_PURCHASE : GC_DEFAULT_NA;
NewStationResolver(&object, statspec, st, tile);
group = Resolve(statspec->spritegroup[ctype], &object);
if ((group == NULL || group->type != SGT_RESULT) && ctype != GC_DEFAULT_NA) {
group = Resolve(statspec->spritegroup[GC_DEFAULT_NA], &object);
}
if ((group == NULL || group->type != SGT_RESULT) && ctype != GC_DEFAULT) {
group = Resolve(statspec->spritegroup[GC_DEFAULT], &object);
}
if (group == NULL || group->type != SGT_RESULT) return 0;
return group->g.result.sprite - 0x42D;
}
SpriteID GetCustomStationGroundRelocation(const StationSpec *statspec, const Station *st, TileIndex tile)
{
const SpriteGroup *group;
ResolverObject object;
CargoID ctype = (st == NULL) ? GC_PURCHASE : GC_DEFAULT_NA;
NewStationResolver(&object, statspec, st, tile);
object.callback_param1 = 1; /* Indicate we are resolving the ground sprite */
group = Resolve(statspec->spritegroup[ctype], &object);
if ((group == NULL || group->type != SGT_RESULT) && ctype != GC_DEFAULT_NA) {
group = Resolve(statspec->spritegroup[GC_DEFAULT_NA], &object);
}
if ((group == NULL || group->type != SGT_RESULT) && ctype != GC_DEFAULT) {
group = Resolve(statspec->spritegroup[GC_DEFAULT], &object);
}
if ((group == NULL || group->type != SGT_RESULT)) {
group = Resolve(statspec->groundgroup, &object);
}
if (group == NULL || group->type != SGT_RESULT) return 0;
return group->g.result.sprite - 0x42D;
}
uint16 GetStationCallback(uint16 callback, uint32 param1, uint32 param2, const StationSpec *statspec, const Station *st, TileIndex tile)
{
const SpriteGroup *group;
ResolverObject object;
CargoID ctype = (st == NULL) ? GC_PURCHASE : GC_DEFAULT_NA;
NewStationResolver(&object, statspec, st, tile);
object.callback = callback;
object.callback_param1 = param1;
object.callback_param2 = param2;
group = Resolve(statspec->spritegroup[ctype], &object);
if ((group == NULL || group->type != SGT_CALLBACK) && ctype != GC_DEFAULT_NA) {
group = Resolve(statspec->spritegroup[GC_DEFAULT_NA], &object);
}
if ((group == NULL || group->type != SGT_CALLBACK) && ctype != GC_DEFAULT) {
group = Resolve(statspec->spritegroup[GC_DEFAULT], &object);
}
if (group == NULL || group->type != SGT_CALLBACK) return CALLBACK_FAILED;
return group->g.callback.result;
}
/**
* Allocate a StationSpec to a Station. This is called once per build operation.
* @param spec StationSpec to allocate.
* @param st Station to allocate it to.
* @param exec Whether to actually allocate the spec.
* @return Index within the Station's spec list, or -1 if the allocation failed.
*/
int AllocateSpecToStation(const StationSpec *statspec, Station *st, bool exec)
{
uint i;
if (statspec == NULL) return 0;
/* Check if this spec has already been allocated */
for (i = 1; i < st->num_specs && i < MAX_SPECLIST; i++) {
if (st->speclist[i].spec == statspec) return i;
}
for (i = 1; i < st->num_specs && i < MAX_SPECLIST; i++) {
if (st->speclist[i].spec == NULL && st->speclist[i].grfid == 0) break;
}
if (i == MAX_SPECLIST) return -1;
if (exec) {
if (i >= st->num_specs) {
st->num_specs = i + 1;
st->speclist = realloc(st->speclist, st->num_specs * sizeof(*st->speclist));
if (st->num_specs == 2) {
/* Initial allocation */
st->speclist[0].spec = NULL;
st->speclist[0].grfid = 0;
st->speclist[0].localidx = 0;
}
}
st->speclist[i].spec = statspec;
st->speclist[i].grfid = statspec->grfid;
st->speclist[i].localidx = statspec->localidx;
}
return i;
}
/** Deallocate a StationSpec from a Station. Called when removing a single station tile.
* @param st Station to work with.
* @param specindex Index of the custom station within the Station's spec list.
* @return Indicates whether the StationSpec was deallocated.
*/
bool DeallocateSpecFromStation(Station *st, byte specindex)
{
bool freeable = true;
/* specindex of 0 (default) is never freeable */
if (specindex == 0) return false;
/* Check all tiles over the station to check if the specindex is still in use */
BEGIN_TILE_LOOP(tile, st->trainst_w, st->trainst_h, st->train_tile) {
if (IsTileType(tile, MP_STATION) && GetStationIndex(tile) == st->index && IsRailwayStation(tile) && GetCustomStationSpecIndex(tile) == specindex) {
freeable = false;
break;
}
} END_TILE_LOOP(tile, st->trainst_w, st->trainst_h, st->train_tile)
if (freeable) {
/* This specindex is no longer in use, so deallocate it */
st->speclist[specindex].spec = NULL;
st->speclist[specindex].grfid = 0;
st->speclist[specindex].localidx = 0;
/* If this was the highest spec index, reallocate */
if (specindex == st->num_specs - 1) {
for (; st->speclist[st->num_specs - 1].grfid == 0 && st->num_specs > 1; st->num_specs--);
if (st->num_specs > 1) {
st->speclist = realloc(st->speclist, st->num_specs * sizeof(*st->speclist));
} else {
free(st->speclist);
st->num_specs = 0;
st->speclist = NULL;
}
}
}
return freeable;
}
/** Draw representation of a station tile for GUI purposes.
* @param x, y Position of image.
* @param dir Direction.
* @param railtype Rail type.
* @param sclass, station Type of station.
* @return True if the tile was drawn (allows for fallback to default graphic)
*/
bool DrawStationTile(int x, int y, RailType railtype, Axis axis, StationClassID sclass, uint station)
{
const StationSpec *statspec;
const DrawTileSprites *sprites;
const DrawTileSeqStruct *seq;
const RailtypeInfo *rti = GetRailTypeInfo(railtype);
SpriteID relocation;
PalSpriteID image;
PalSpriteID colourmod = SPRITE_PALETTE(PLAYER_SPRITE_COLOR(_local_player));
uint tile = 2;
statspec = GetCustomStationSpec(sclass, station);
if (statspec == NULL) return false;
relocation = GetCustomStationRelocation(statspec, NULL, INVALID_TILE);
if (HASBIT(statspec->callbackmask, CBM_CUSTOM_LAYOUT)) {
uint16 callback = GetStationCallback(CBID_STATION_SPRITE_LAYOUT, 0x2110000, 0, statspec, NULL, INVALID_TILE);
if (callback != CALLBACK_FAILED) tile = callback;
}
if (statspec->renderdata == NULL) {
sprites = GetStationTileLayout(tile + axis);
} else {
sprites = &statspec->renderdata[(tile < statspec->tiles) ? tile + axis : axis];
}
image = sprites->ground_sprite;
if (HASBIT(image, 31)) {
CLRBIT(image, 31);
image += GetCustomStationGroundRelocation(statspec, NULL, INVALID_TILE);
image += rti->custom_ground_offset;
} else {
image += rti->total_offset;
}
if (image & PALETTE_MODIFIER_COLOR) image &= SPRITE_MASK;
DrawSprite(image, x, y);
foreach_draw_tile_seq(seq, sprites->seq) {
Point pt;
image = seq->image;
if (HASBIT(image, 30)) {
CLRBIT(image, 30);
image += rti->total_offset;
} else {
image += relocation;
}
if ((byte)seq->delta_z != 0x80) {
pt = RemapCoords(seq->delta_x, seq->delta_y, seq->delta_z);
DrawSprite((image & SPRITE_MASK) | colourmod, x + pt.x, y + pt.y);
}
}
return true;
}
/* Check if a rail station tile is traversable.
* XXX This could be cached (during build) in the map array to save on all the dereferencing */
bool IsStationTileBlocked(TileIndex tile)
{
const Station *st;
const StationSpec *statspec;
uint specindex;
if (!IsCustomStationSpecIndex(tile)) return false;
st = GetStationByTile(tile);
specindex = GetCustomStationSpecIndex(tile);
if (specindex >= st->num_specs) return false;
statspec = st->speclist[specindex].spec;
if (statspec == NULL) return false;
return HASBIT(statspec->blocked, GetStationGfx(tile));
}
/* Check if a rail station tile is electrifiable.
* XXX This could be cached (during build) in the map array to save on all the dereferencing */
bool IsStationTileElectrifiable(TileIndex tile)
{
const Station *st;
const StationSpec *statspec;
uint specindex;
if (!IsCustomStationSpecIndex(tile)) return true;
st = GetStationByTile(tile);
specindex = GetCustomStationSpecIndex(tile);
if (specindex >= st->num_specs) return false;
statspec = st->speclist[specindex].spec;
if (statspec == NULL) return false;
return HASBIT(statspec->pylons, GetStationGfx(tile)) || !HASBIT(statspec->wires, GetStationGfx(tile));
}
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