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-rw-r--r--train_cmd.c2645
1 files changed, 2645 insertions, 0 deletions
diff --git a/train_cmd.c b/train_cmd.c
new file mode 100644
index 000000000..615610885
--- /dev/null
+++ b/train_cmd.c
@@ -0,0 +1,2645 @@
+#include "stdafx.h"
+#include "ttd.h"
+#include "vehicle.h"
+#include "command.h"
+#include "pathfind.h"
+#include "station.h"
+#include "table/train_cmd.h"
+#include "gfx.h"
+#include "news.h"
+#include "engine.h"
+#include "player.h"
+
+
+#define is_firsthead_sprite(spritenum) \
+ (is_custom_sprite(spritenum) \
+ ? is_custom_firsthead_sprite(spritenum) \
+ : _engine_sprite_add[spritenum] == 0)
+
+
+static const byte _vehicle_initial_x_fract[4] = {10,8,4,8};
+static const byte _vehicle_initial_y_fract[4] = {8,4,8,10};
+static const byte _state_dir_table[4] = { 0x20, 8, 0x10, 4 };
+
+static const byte _signal_onedir[14] = {
+ 0x80, 0x80, 0x80, 0x20, 0x40, 0x10, 0, 0,
+ 0x40, 0x40, 0x40, 0x10, 0x80, 0x20
+};
+
+static const byte _signal_otherdir[14] = {
+ 0x40, 0x40, 0x40, 0x10, 0x80, 0x20, 0, 0,
+ 0x80, 0x80, 0x80, 0x20, 0x40, 0x10
+};
+
+void UpdateTrainAcceleration(Vehicle *v)
+{
+ uint acc, power=0, max_speed=5000, weight=0;
+ Vehicle *u = v;
+
+ assert(v->subtype == 0);
+
+ // compute stuff like max speed, power, and weight.
+ do {
+ const RailVehicleInfo *rvi = &_rail_vehicle_info[u->engine_type];
+
+ // power is sum of the power for all engines
+ power += rvi->power;
+
+ // limit the max speed to the speed of the slowest vehicle.
+ if (rvi->max_speed && rvi->max_speed <= max_speed) max_speed = rvi->max_speed;
+
+ // weight is the sum of the weight of the wagon and the weight of the cargo.
+ weight += rvi->weight;
+ weight += (_cargoc.weights[u->cargo_type] * u->cargo_count) >> 4;
+
+ } while ( (u=u->next) != NULL);
+
+ // these are shown in the UI
+ v->u.rail.cached_weight = weight;
+ v->u.rail.cached_power = power;
+ v->max_speed = max_speed;
+
+ assert(weight != 0);
+
+ // compute acceleration
+ acc = power / weight * 4;
+
+ if (acc >= 255) acc=255;
+ if (acc == 0) acc++;
+
+ v->acceleration = (byte)acc;
+}
+
+#define F_GRAV 9.82f
+#define F_THETA 0.05f
+
+#define F_HP_KW 0.74569f
+#define F_KPH_MS 0.27778f
+#define F_MU 0.3f
+
+#define F_COEF_FRIC 0.04f
+#define F_COEF_ROLL 0.18f
+
+#define F_CURVE_FACTOR (1/96.f)
+
+bool IsTunnelTile(TileIndex tile);
+
+static int GetRealisticAcceleration(Vehicle *v)
+{
+ uint emass = 0;
+ Vehicle *u = v;
+ float f = 0.0f, spd;
+ int curves = 0;
+
+ assert(v->subtype == 0);
+
+ // compute inclination force and number of curves.
+ do {
+ const RailVehicleInfo *rvi = &_rail_vehicle_info[u->engine_type];
+ uint mass = rvi->weight + ((_cargoc.weights[u->cargo_type] * u->cargo_count) >> 4);
+ if (rvi->power) emass += mass;
+
+ if (u->u.rail.flags & VRF_GOINGUP) {
+ f += (float)mass * ( -F_GRAV * F_THETA);
+ } else if (u->u.rail.flags & VRF_GOINGDOWN) {
+ f += (float)mass * ( F_GRAV * F_THETA);
+ }
+
+ // compute curve penalty..
+ if (u->next != NULL) {
+ uint diff = (u->direction - u->next->direction) & 7;
+ if (diff) {
+ curves += (diff == 1 || diff == 7) ? 1 : 3;
+ }
+ }
+ } while ((u = u->next) != NULL);
+
+ spd = (float)(v->cur_speed ? v->cur_speed : 1);
+
+ // compute tractive effort
+ {
+ float te = (float)v->u.rail.cached_power * (F_HP_KW/F_KPH_MS) / spd;
+ float te2 = (float)emass * (F_MU * F_GRAV);
+ if (te > te2) te = te2;
+ f += te;
+ }
+
+ // add air resistance
+ {
+ float cx = 1.0f; // NOT DONE
+
+ // air resistance is doubled in tunnels.
+ if (v->vehstatus == 0x40) cx *= 2;
+
+ f -= cx * spd * spd * (F_KPH_MS * F_KPH_MS * 0.001f);
+ }
+
+ // after this f contains the acceleration.
+ f /= (float)v->u.rail.cached_weight;
+
+ // add friction to sum of forces (avoid mul by weight). (0.001 because we want kN)
+ f -= (F_COEF_FRIC * F_GRAV * 0.001f + (F_COEF_ROLL * F_KPH_MS * F_GRAV * 0.001f) * spd);
+
+ // penalty for curves?
+ if (curves)
+ f -= (float)min(curves, 8) * F_CURVE_FACTOR;
+
+ return (int)(f * (1.0/(F_KPH_MS * 0.015f)) + 0.5f);
+}
+
+
+int GetTrainImage(Vehicle *v, byte direction)
+{
+ int img = v->spritenum;
+ int base;
+
+ if (is_custom_sprite(img)) {
+ base = GetCustomVehicleSprite(v, direction + 4 * is_custom_secondhead_sprite(img));
+ if (base) return base;
+ img = _engine_original_sprites[v->engine_type];
+ }
+
+ base = _engine_sprite_base[img] + ((direction + _engine_sprite_add[img]) & _engine_sprite_and[img]);
+
+ if (v->cargo_count >= (v->cargo_cap >> 1))
+ base += _wagon_full_adder[img];
+ return base;
+}
+
+void DrawTrainEngine(int x, int y, int engine, uint32 image_ormod)
+{
+ const RailVehicleInfo *rvi = &_rail_vehicle_info[engine];
+
+ int img = rvi->image_index;
+ uint32 image = 0;
+
+ if (is_custom_sprite(img)) {
+ image = GetCustomEngineSprite(engine, -1, CID_PURCHASE, 0, 0, 6);
+ if (!image) img = _engine_original_sprites[engine];
+ }
+ if (!image) {
+ image = (6 & _engine_sprite_and[img]) + _engine_sprite_base[img];
+ }
+
+ if (rvi->flags & RVI_MULTIHEAD) {
+ DrawSprite(image | image_ormod, x-14, y);
+ x += 15;
+ image = 0;
+ if (is_custom_sprite(img)) {
+ image = GetCustomEngineSprite(engine, -1, CID_PURCHASE, 0, 0, 2);
+ if (!image) img = _engine_original_sprites[engine];
+ }
+ if (!image) {
+ image = ((6 + _engine_sprite_add[img+1]) & _engine_sprite_and[img+1]) + _engine_sprite_base[img+1];
+ }
+ }
+ DrawSprite(image | image_ormod, x, y);
+}
+
+void DrawTrainEngineInfo(int engine, int x, int y, int maxw)
+{
+ const RailVehicleInfo *rvi = &_rail_vehicle_info[engine];
+ int cap;
+ uint multihead = ((rvi->flags & RVI_MULTIHEAD) ? 1 : 0);
+
+ SET_DPARAM32(0, ((_price.build_railvehicle >> 3) * rvi->base_cost) >> 5);
+ SET_DPARAM16(2, rvi->max_speed * 10 >> 4);
+ SET_DPARAM16(3, rvi->power << multihead);
+ SET_DPARAM16(1, rvi->weight << multihead);
+
+ SET_DPARAM32(4, (rvi->running_cost_base * _price.running_rail[rvi->engclass] >> 8) << multihead);
+
+ cap = rvi->capacity;
+ SET_DPARAM16(5, STR_8838_N_A);
+ if (cap != 0) {
+ SET_DPARAM16(6, cap << multihead);
+ SET_DPARAM16(5, _cargoc.names_long_p[rvi->cargo_type]);
+ }
+ DrawStringMultiCenter(x, y, STR_885B_COST_WEIGHT_T_SPEED_POWER, maxw);
+}
+
+
+int32 CmdBuildRailWagon(uint engine, uint tile, uint32 flags)
+{
+ int32 value;
+ Vehicle *v;
+ const RailVehicleInfo *rvi;
+ int dir;
+ const Engine *e;
+ int x,y;
+
+ rvi = &_rail_vehicle_info[engine];
+ value = (rvi->base_cost * _price.build_railwagon) >> 8;
+
+ if (!(flags & DC_QUERY_COST)) {
+ _error_message = STR_00E1_TOO_MANY_VEHICLES_IN_GAME;
+
+ v = AllocateVehicle();
+ if (v == NULL)
+ return CMD_ERROR;
+
+ if (flags & DC_EXEC) {
+ byte img = rvi->image_index;
+ Vehicle *u;
+
+ v->spritenum = img;
+
+ u = _vehicles;
+ for(;;) {
+ if (u->type == VEH_Train && u->tile == (TileIndex)tile &&
+ u->subtype == 4 && u->engine_type == engine) {
+ u = GetLastVehicleInChain(u);
+ break;
+ }
+
+ if (++u == endof(_vehicles)) {
+ u = NULL;
+ break;
+ }
+ }
+
+ v->engine_type = engine;
+
+ dir = _map5[tile] & 3;
+
+ v->direction = (byte)(dir*2+1);
+ v->tile = (TileIndex)tile;
+
+ x = GET_TILE_X(tile)*16 | _vehicle_initial_x_fract[dir];
+ y = GET_TILE_Y(tile)*16 | _vehicle_initial_y_fract[dir];
+
+ v->x_pos = x;
+ v->y_pos = y;
+ v->z_pos = GetSlopeZ(x,y);
+ v->owner = _current_player;
+ v->z_height = 6;
+ v->u.rail.track = 0x80;
+ v->vehstatus = VS_HIDDEN | VS_DEFPAL;
+
+ v->subtype = 4;
+ if (u != NULL) {
+ u->next = v;
+ v->subtype = 2;
+ v->u.rail.first_engine = u->u.rail.first_engine;
+ if (v->u.rail.first_engine == 0xffff && u->subtype == 0)
+ v->u.rail.first_engine = u->engine_type;
+ } else {
+ v->u.rail.first_engine = 0xffff;
+ }
+
+ v->cargo_type = rvi->cargo_type;
+ v->cargo_cap = rvi->capacity;
+ v->value = value;
+// v->day_counter = 0;
+
+ e = &_engines[engine];
+ v->u.rail.railtype = e->railtype;
+
+ v->build_year = _cur_year;
+ v->type = VEH_Train;
+ v->cur_image = 0xAC2;
+
+ _new_wagon_id = v->index;
+
+ VehiclePositionChanged(v);
+
+ InvalidateWindow(WC_VEHICLE_DEPOT, v->tile);
+ }
+ }
+
+ return value;
+}
+
+// Move all free vehicles in the depot to the train
+static void NormalizeTrainVehInDepot(Vehicle *u)
+{
+ Vehicle *v;
+ FOR_ALL_VEHICLES(v) {
+ if (v->type == VEH_Train && v->subtype==4 &&
+ v->tile == u->tile &&
+ v->u.rail.track == 0x80) {
+ if (DoCommandByTile(0,v->index | (u->index<<16), 1, DC_EXEC, CMD_MOVE_RAIL_VEHICLE) == CMD_ERROR)
+ break;
+ }
+ }
+}
+
+static const byte _railveh_unk1[] = {
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 1, 1, 0, 0, 0,
+ 0, 0, 0, 0, 1, 0, 1, 0,
+ 0, 1, 1, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 1,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0,
+};
+
+static const byte _railveh_score[] = {
+ 1, 4, 7, 19, 20, 30, 31, 19,
+ 20, 21, 22, 10, 11, 30, 31, 32,
+ 33, 34, 35, 29, 45, 32, 50, 40,
+ 41, 51, 52, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 60, 62,
+ 63, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 70, 71, 72, 73,
+ 74, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0,
+};
+
+
+static int32 EstimateTrainCost(const RailVehicleInfo *rvi)
+{
+ return (rvi->base_cost * (_price.build_railvehicle >> 3)) >> 5;
+}
+
+/* Build a railroad vehicle
+ * p1 = vehicle type id
+ */
+
+int32 CmdBuildRailVehicle(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+{
+ const RailVehicleInfo *rvi;
+ int value,dir;
+ Vehicle *v, *u;
+ byte unit_num;
+ Engine *e;
+ uint tile;
+
+ _cmd_build_rail_veh_var1 = 0;
+
+ SET_EXPENSES_TYPE(EXPENSES_NEW_VEHICLES);
+
+ tile = TILE_FROM_XY(x,y);
+ rvi = &_rail_vehicle_info[p1];
+
+ if (rvi->flags & RVI_WAGON) {
+ return CmdBuildRailWagon(p1, tile, flags);
+ }
+
+ value = EstimateTrainCost(rvi);
+
+ if (!(flags & DC_QUERY_COST)) {
+ v = AllocateVehicle();
+ if (v == NULL || _ptr_to_next_order >= endof(_order_array))
+ return_cmd_error(STR_00E1_TOO_MANY_VEHICLES_IN_GAME);
+
+ unit_num = GetFreeUnitNumber(VEH_Train);
+ if (unit_num > _patches.max_trains)
+ return_cmd_error(STR_00E1_TOO_MANY_VEHICLES_IN_GAME);
+
+ if (flags & DC_EXEC) {
+ v->unitnumber = unit_num;
+
+ dir = _map5[tile] & 3;
+
+ v->direction = (byte)(dir*2+1);
+ v->tile = (TileIndex)tile;
+ v->owner = _current_player;
+ v->x_pos = (x |= _vehicle_initial_x_fract[dir]);
+ v->y_pos = (y |= _vehicle_initial_y_fract[dir]);
+ v->z_pos = GetSlopeZ(x,y);
+ v->z_height = 6;
+ v->u.rail.track = 0x80;
+ v->u.rail.first_engine = 0xffff;
+ v->vehstatus = VS_HIDDEN | VS_STOPPED | VS_DEFPAL;
+// v->subtype = 0;
+ v->spritenum = rvi->image_index;
+ v->cargo_type = rvi->cargo_type;
+ v->cargo_cap = rvi->capacity;
+ v->max_speed = rvi->max_speed;
+// v->cargo_count = 0;
+ v->value = value;
+// v->day_counter = 0;
+// v->next_order = 0;
+// v->next_station = 0;
+// v->load_unload_time_rem = 0;
+// v->progress = 0;
+// v->targetairport = 0;
+// v->crash_anim_pos = 0;
+ v->last_station_visited = 0xff;
+ v->dest_tile = 0;
+// v->profit_last_year = 0;
+// v->profit_this_year = 0;
+
+ v->engine_type = (byte)p1;
+ e = &_engines[p1];
+
+ v->reliability = e->reliability;
+ v->reliability_spd_dec = e->reliability_spd_dec;
+ v->max_age = e->lifelength * 366;
+
+ v->string_id = STR_SV_TRAIN_NAME;
+// v->cur_speed = 0;
+// v->subspeed = 0;
+ v->u.rail.railtype = e->railtype;
+ _new_train_id = v->index;
+// v->cur_order_index = 0;
+// v->num_orders = 0;
+
+ *(v->schedule_ptr = _ptr_to_next_order++) = 0;
+// v->next_in_chain = 0xffff;
+// v->next = NULL;
+
+ v->service_interval = _patches.servint_trains;
+// v->breakdown_ctr = 0;
+// v->breakdowns_since_last_service = 0;
+// v->unk4D = 0;
+ v->date_of_last_service = _date;
+ v->build_year = _cur_year;
+ v->type = VEH_Train;
+ v->cur_image = 0xAC2;
+
+ VehiclePositionChanged(v);
+
+ if (rvi->flags&RVI_MULTIHEAD && (u=AllocateVehicle()) != NULL) {
+ u->direction = v->direction;
+ u->owner = v->owner;
+ u->tile = v->tile;
+ u->x_pos = v->x_pos;
+ u->y_pos = v->y_pos;
+ u->z_pos = v->z_pos;
+ u->z_height = 6;
+ u->u.rail.track = 0x80;
+ v->u.rail.first_engine = 0xffff;
+ u->vehstatus = VS_HIDDEN | VS_DEFPAL;
+ u->subtype = 2;
+ u->spritenum = v->spritenum + 1;
+ u->cargo_type = v->cargo_type;
+ u->cargo_cap = v->cargo_cap;
+ u->u.rail.railtype = v->u.rail.railtype;
+// u->next_in_chain = 0xffff;
+ v->next = u;
+ u->engine_type = v->engine_type;
+ u->build_year = v->build_year;
+ v->value = u->value = v->value >> 1;
+// u->day_counter = 0;
+ u->type = VEH_Train;
+ u->cur_image = 0xAC2;
+ VehiclePositionChanged(u);
+ }
+
+ UpdateTrainAcceleration(v);
+ NormalizeTrainVehInDepot(v);
+
+ InvalidateWindow(WC_VEHICLE_DEPOT, tile);
+ InvalidateWindow(WC_TRAINS_LIST, v->owner);
+ InvalidateWindow(WC_COMPANY, v->owner);
+ }
+ }
+ _cmd_build_rail_veh_var1 = _railveh_unk1[p1];
+ _cmd_build_rail_veh_score = _railveh_score[p1];
+ return value;
+}
+
+
+bool IsTrainDepotTile(TileIndex tile)
+{
+ return IS_TILETYPE(tile, MP_RAILWAY) &&
+ (_map5[tile] & 0xFC) == 0xC0;
+}
+
+bool IsTunnelTile(TileIndex tile)
+{
+ return IS_TILETYPE(tile, MP_TUNNELBRIDGE) &&
+ (_map5[tile]&0x80) == 0;
+}
+
+
+int CheckStoppedInDepot(Vehicle *v)
+{
+ int count;
+ TileIndex tile = v->tile;
+
+ /* check if stopped in a depot */
+ if (!IsTrainDepotTile(tile) || v->cur_speed != 0) {
+errmsg:
+ _error_message = STR_881A_TRAINS_CAN_ONLY_BE_ALTERED;
+ return -1;
+ }
+
+ count = 0;
+ do {
+ count++;
+ if (v->u.rail.track != 0x80 || v->tile != (TileIndex)tile ||
+ (v->subtype==0 && !(v->vehstatus&VS_STOPPED)))
+ goto errmsg;
+ } while ( (v=v->next) != NULL);
+
+ return count;
+}
+
+// unlink a rail wagon from the linked list.
+// returns the new value of first
+static Vehicle *UnlinkWagon(Vehicle *v, Vehicle *first)
+{
+ // unlinking the first vehicle of the chain?
+ v->u.rail.first_engine = 0xffff;
+ if (v == first) {
+ Vehicle *u;
+ if ((v=v->next) == NULL) return NULL;
+ for (u=v; u; u=u->next) u->u.rail.first_engine = v->engine_type;
+ v->subtype = 4;
+ return v;
+ } else {
+ Vehicle *u;
+ for(u=first; u->next!=v; u=u->next) {}
+ u->next = v->next;
+ return first;
+ }
+}
+
+static Vehicle *FindGoodVehiclePos(Vehicle *src)
+{
+ Vehicle *dst;
+ uint16 eng = src->engine_type;
+ TileIndex tile = src->tile;
+
+ FOR_ALL_VEHICLES(dst) {
+ if (dst->type==VEH_Train && dst->subtype==4 && dst->tile==tile) {
+ // check so all vehicles in the line have the same engine.
+ Vehicle *v = dst;
+ while (v->engine_type == eng) {
+ if ((v = v->next) == NULL) return dst;
+ }
+ }
+ }
+
+ return NULL;
+}
+
+/* p1 & 0xffff= source vehicle index
+ p1 & 0xffff0000 = what wagon to put the wagon AFTER, 0xffff0000 to make a new line
+ p2 & 1 = move all vehicles following the vehicle..
+ */
+
+int32 CmdMoveRailVehicle(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+{
+ Vehicle *src, *dst, *src_head, *dst_head;
+ bool is_loco;
+
+ src = &_vehicles[p1 & 0xffff];
+ if (src->type != VEH_Train) return CMD_ERROR;
+
+ is_loco = !(_rail_vehicle_info[src->engine_type].flags & RVI_WAGON)
+ && is_firsthead_sprite(src->spritenum);
+
+ // if nothing is selected as destination, try and find a matching vehicle to drag to.
+ if (((int32)p1 >> 16) == -1) {
+ dst = NULL;
+ if (!is_loco) dst = FindGoodVehiclePos(src);
+ } else {
+ dst = &_vehicles[((int32)p1 >> 16)];
+ }
+
+ // don't move the same vehicle..
+ if (src == dst)
+ return 0;
+
+ /* the player must be the owner */
+ if (!CheckOwnership(src->owner) || (dst!=NULL && !CheckOwnership(dst->owner)))
+ return CMD_ERROR;
+
+ /* locate the head of the two chains */
+ src_head = GetFirstVehicleInChain(src);
+ dst_head = NULL;
+ if (dst != NULL) dst_head = GetFirstVehicleInChain(dst);
+
+ /* check if all vehicles in the source train are stopped */
+ if (CheckStoppedInDepot(src_head) < 0)
+ return CMD_ERROR;
+
+ /* check if all the vehicles in the dest train are stopped,
+ * and that the length of the dest train is no longer than XXX vehicles */
+ if (dst_head != NULL) {
+ int num = CheckStoppedInDepot(dst_head);
+ if (num < 0)
+ return CMD_ERROR;
+
+ if (num > (_patches.mammoth_trains ? 100 : 9) && dst_head->subtype==0)
+ return_cmd_error(STR_8819_TRAIN_TOO_LONG);
+
+ // if it's a multiheaded vehicle we're dragging to, drag to the vehicle before..
+ while (is_custom_secondhead_sprite(dst->spritenum)
+ || (!is_custom_sprite(dst->spritenum) && _engine_sprite_add[dst->spritenum] != 0)) {
+ Vehicle *v = GetPrevVehicleInChain(dst);
+ if (!v || src == v) break;
+ dst = v;
+ }
+
+ assert(dst_head->tile == src_head->tile);
+ }
+
+ // when moving all wagons, we can't have the same src_head and dst_head
+ if (p2 & 1 && src_head == dst_head)
+ return 0;
+
+ // moving a loco to a new line?, then we need to assign a unitnumber.
+ if (dst == NULL && src->subtype != 0 && is_loco) {
+ uint unit_num = GetFreeUnitNumber(VEH_Train);
+ if (unit_num > _patches.max_trains)
+ return_cmd_error(STR_00E1_TOO_MANY_VEHICLES_IN_GAME);
+
+ if (flags & DC_EXEC)
+ src->unitnumber = unit_num;
+ }
+
+
+ /* do it? */
+ if (flags & DC_EXEC) {
+ if (p2 & 1) {
+ // unlink ALL wagons
+ if (src != src_head) {
+ Vehicle *v = src_head;
+ while (v->next != src) v=v->next;
+ v->next = NULL;
+ }
+ } else {
+ // unlink single wagon from linked list
+ UnlinkWagon(src, src_head);
+ src->next = NULL;
+ }
+
+ if (dst == NULL) {
+ // move the train to an empty line. for locomotives, we set the type to 0. for wagons, 4.
+ if (is_loco) {
+ if (src->subtype != 0) {
+ // setting the type to 0 also involves setting up the schedule_ptr field.
+ src->subtype = 0;
+ assert(src->schedule_ptr == NULL);
+ *(src->schedule_ptr = _ptr_to_next_order++) = 0;
+ src->num_orders = 0;
+ }
+ dst_head = src;
+ } else {
+ src->subtype = 4;
+ }
+ src->u.rail.first_engine = 0xffff;
+ } else {
+ if (src->subtype == 0) {
+ // the vehicle was previously a loco. need to free the schedule list and delete vehicle windows etc.
+ DeleteWindowById(WC_VEHICLE_VIEW, src->index);
+ DeleteVehicleSchedule(src);
+ }
+
+ src->subtype = 2;
+ src->unitnumber = 0; // doesn't occupy a unitnumber anymore.
+
+ // setup first_engine
+ src->u.rail.first_engine = dst->u.rail.first_engine;
+ if (src->u.rail.first_engine == 0xffff && dst->subtype == 0)
+ src->u.rail.first_engine = dst->engine_type;
+
+ // link in the wagon(s) in the chain.
+ {
+ Vehicle *v = src;
+ while (v->next != NULL) {
+ v->next->u.rail.first_engine = v->u.rail.first_engine;
+ v = v->next;
+ }
+ v->next = dst->next;
+ }
+ dst->next = src;
+ }
+
+ if (src_head->subtype == 0)
+ UpdateTrainAcceleration(src_head);
+ InvalidateWindow(WC_VEHICLE_DETAILS, src_head->index);
+
+ if (dst_head) {
+ if (dst_head->subtype == 0)
+ UpdateTrainAcceleration(dst_head);
+ InvalidateWindow(WC_VEHICLE_DETAILS, dst_head->index);
+ }
+
+ InvalidateWindow(WC_VEHICLE_DEPOT, src_head->tile);
+ InvalidateWindow(WC_TRAINS_LIST, _current_player);
+ }
+
+ return 0;
+}
+
+/* p1 = train to start / stop */
+int32 CmdStartStopTrain(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+{
+ Vehicle *v;
+
+ v = &_vehicles[p1];
+
+ if (!CheckOwnership(v->owner))
+ return CMD_ERROR;
+
+ if (flags & DC_EXEC) {
+ v->u.rail.days_since_order_progr = 0;
+ v->vehstatus ^= VS_STOPPED;
+ InvalidateWindowWidget(WC_VEHICLE_VIEW, v->index, 4);
+ InvalidateWindow(WC_VEHICLE_DEPOT, v->tile);
+ }
+ return 0;
+}
+
+// p1 = wagon/loco index
+// p2 = mode
+// 0: sell just the vehicle
+// 1: sell the vehicle and all vehicles that follow it in the chain
+// 2: when selling attached locos, rearrange all vehicles after it to separate lines.
+int32 CmdSellRailWagon(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+{
+ Vehicle *v, *first,*last;
+ int32 cost;
+
+ SET_EXPENSES_TYPE(EXPENSES_NEW_VEHICLES);
+
+ v = &_vehicles[p1];
+
+ if (!CheckOwnership(v->owner))
+ return CMD_ERROR;
+
+ // get first vehicle in chain
+ first = v;
+ if (first->subtype != 0) {
+ first = GetFirstVehicleInChain(first);
+ last = NULL;
+ } else {
+ if (p2 != 1) {
+ // sell last part of multiheaded?
+ last = GetLastVehicleInChain(v);
+ if (is_firsthead_sprite(last->spritenum))
+ last = NULL;
+ } else {
+ last = NULL;
+ }
+ }
+
+ // make sure the vehicle is stopped in the depot
+ if (CheckStoppedInDepot(first) < 0)
+ return CMD_ERROR;
+
+
+ if (flags & DC_EXEC) {
+ // always redraw the depot. maybe redraw train list
+ InvalidateWindow(WC_VEHICLE_DEPOT, first->tile);
+ if (first->subtype == 0) InvalidateWindow(WC_TRAINS_LIST, first->owner);
+ // when selling an attached locomotive. we need to delete its window.
+ if (v->subtype == 0) {
+ DeleteWindowById(WC_VEHICLE_VIEW, v->index);
+
+ // rearrange all vehicles that follow to separate lines.
+ if (p2 == 2) {
+ Vehicle *u,*tmp;
+ u = v->next;
+ while (u != last) {
+ tmp = u;
+ u = u->next;
+ DoCommandByTile(tmp->tile, tmp->index | ((-1)<<16), 0, DC_EXEC, CMD_MOVE_RAIL_VEHICLE);
+ }
+ }
+ }
+
+ // delete the vehicles
+ cost = 0;
+ for(;;) {
+ Vehicle *tmp;
+
+ assert(first);
+ first = UnlinkWagon(v, first);
+ cost -= v->value;
+ tmp = v;
+ v = v->next;
+ DeleteVehicle(tmp);
+ if (v == NULL || p2 != 1) break;
+ }
+
+ // delete last vehicle of multiheaded train?
+ if (last) {
+ first = UnlinkWagon(last, first);
+ cost -= last->value;
+ DeleteVehicle(last);
+ }
+
+ // an attached train changed?
+ if (first && first->subtype == 0) {
+ UpdateTrainAcceleration(first);
+ InvalidateWindow(WC_VEHICLE_DETAILS, first->index);
+ }
+ } else {
+ cost = 0;
+ for(;;) {
+ cost -= v->value;
+ if ((v=v->next) == NULL || p2 != 1) break;
+ }
+ if (last) cost -= last->value;
+ }
+
+ return cost;
+}
+
+static void UpdateTrainDeltaXY(Vehicle *v, int direction)
+{
+#define MKIT(a,b,c,d) ((a&0xFF)<<24) | ((b&0xFF)<<16) | ((c&0xFF)<<8) | ((d&0xFF)<<0)
+ static const uint32 _delta_xy_table[8] = {
+ MKIT(3, 3, -1, -1),
+ MKIT(3, 7, -1, -3),
+ MKIT(3, 3, -1, -1),
+ MKIT(7, 3, -3, -1),
+ MKIT(3, 3, -1, -1),
+ MKIT(3, 7, -1, -3),
+ MKIT(3, 3, -1, -1),
+ MKIT(7, 3, -3, -1),
+ };
+#undef MKIT
+
+ uint32 x = _delta_xy_table[direction];
+
+ v->x_offs = (byte)x;
+ v->y_offs = (byte)(x>>=8);
+ v->sprite_width = (byte)(x>>=8);
+ v->sprite_height = (byte)(x>>=8);
+}
+
+static void UpdateVarsAfterSwap(Vehicle *v)
+{
+ UpdateTrainDeltaXY(v, v->direction);
+ v->cur_image = GetTrainImage(v, v->direction);
+ BeginVehicleMove(v);
+ VehiclePositionChanged(v);
+ EndVehicleMove(v);
+}
+
+static void SetLastSpeed(Vehicle *v, int spd) {
+ int old = v->u.rail.last_speed;
+ if (spd != old) {
+ v->u.rail.last_speed = spd;
+ if (_patches.vehicle_speed || !old != !spd)
+ InvalidateWindowWidget(WC_VEHICLE_VIEW, v->index, 4);
+ }
+}
+
+static void ReverseTrainSwapVeh(Vehicle *v, int l, int r)
+{
+ Vehicle *a, *b;
+
+ /* locate vehicles to swap */
+ for(a=v; l!=0; l--) { a = a->next; }
+ for(b=v; r!=0; r--) { b = b->next; }
+
+ if (a != b) {
+ /* swap the hidden bits */
+ {
+ uint16 tmp = (a->vehstatus & ~VS_HIDDEN) | (b->vehstatus&VS_HIDDEN);
+ b->vehstatus = (b->vehstatus & ~VS_HIDDEN) | (a->vehstatus&VS_HIDDEN);
+ a->vehstatus = tmp;
+ }
+
+ /* swap variables */
+ swap_byte(&a->u.rail.track, &b->u.rail.track);
+ swap_byte(&a->direction, &b->direction);
+
+ /* toggle direction */
+ if (!(a->u.rail.track & 0x80)) a->direction ^= 4;
+ if (!(b->u.rail.track & 0x80)) b->direction ^= 4;
+
+ /* swap more variables */
+ swap_int16(&a->x_pos, &b->x_pos);
+ swap_int16(&a->y_pos, &b->y_pos);
+ swap_tile(&a->tile, &b->tile);
+ swap_byte(&a->z_pos, &b->z_pos);
+
+ /* update other vars */
+ UpdateVarsAfterSwap(a);
+ UpdateVarsAfterSwap(b);
+ } else {
+ if (!(a->u.rail.track & 0x80)) a->direction ^= 4;
+ UpdateVarsAfterSwap(a);
+ }
+}
+
+static void ReverseTrainDirection(Vehicle *v)
+{
+ int l = 0, r = -1;
+ Vehicle *u;
+
+ if (IsTrainDepotTile(v->tile))
+ InvalidateWindow(WC_VEHICLE_DEPOT, v->tile);
+
+ // count number of vehicles
+ u = v;
+ do r++; while ( (u = u->next) != NULL );
+
+ /* swap start<>end, start+1<>end-1, ... */
+ do {
+ ReverseTrainSwapVeh(v, l++, r--);
+ } while (l <= r);
+
+ if (IsTrainDepotTile(v->tile))
+ InvalidateWindow(WC_VEHICLE_DEPOT, v->tile);
+
+ v->u.rail.flags &= ~VRF_REVERSING;
+}
+
+/* p1 = vehicle */
+int32 CmdReverseTrainDirection(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+{
+ Vehicle *v;
+
+ v = &_vehicles[p1];
+
+ if (!CheckOwnership(v->owner))
+ return CMD_ERROR;
+
+ _error_message = STR_EMPTY;
+
+// if (v->u.rail.track & 0x80 || IsTrainDepotTile(v->tile))
+// return CMD_ERROR;
+
+ if (v->u.rail.crash_anim_pos != 0 || v->breakdown_ctr != 0)
+ return CMD_ERROR;
+
+ if (flags & DC_EXEC) {
+ if (_patches.realistic_acceleration && v->cur_speed != 0) {
+ v->u.rail.flags ^= VRF_REVERSING;
+ } else {
+ v->cur_speed = 0;
+ SetLastSpeed(v, 0);
+ ReverseTrainDirection(v);
+ }
+ }
+ return 0;
+}
+
+int32 CmdForceTrainProceed(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+{
+ Vehicle *v;
+
+ v = &_vehicles[p1];
+
+ if (!CheckOwnership(v->owner))
+ return CMD_ERROR;
+
+ if (flags & DC_EXEC)
+ v->u.rail.force_proceed = 0x50;
+
+ return 0;
+}
+
+// p1 = vehicle to refit
+// p2 = new cargo
+
+int32 CmdRefitRailVehicle(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+{
+ Vehicle *v;
+ int32 cost;
+ uint num;
+
+ SET_EXPENSES_TYPE(EXPENSES_NEW_VEHICLES);
+
+ v = &_vehicles[p1];
+ if (!CheckOwnership(v->owner) || CheckStoppedInDepot(v) < 0)
+ return CMD_ERROR;
+
+ cost = 0;
+ num = 0;
+
+ do {
+ if (!(_rail_vehicle_info[v->engine_type].flags & RVI_WAGON) && (byte)p2 != v->cargo_type && v->cargo_cap != 0) {
+ cost += (_price.ship_base >> 7);
+ num += v->cargo_cap;
+ if (flags & DC_EXEC) {
+ v->cargo_count = 0;
+ v->cargo_type = (byte)p2;
+ InvalidateWindow(WC_VEHICLE_DETAILS, v->index);
+ }
+ }
+ } while ( (v=v->next) != NULL);
+
+ _returned_refit_amount = num;
+
+ return cost;
+}
+
+int GetDepotByTile(uint tile)
+{
+ Depot *d;
+ int i=0;
+ for(d=_depots; d->xy != (TileIndex)tile; d++) { i++; }
+ return i;
+}
+
+typedef struct TrainFindDepotData {
+ uint best_length;
+ uint tile;
+ byte owner;
+} TrainFindDepotData;
+
+static bool TrainFindDepotEnumProc(uint tile, TrainFindDepotData *tfdd, int track, uint length, byte *state)
+{
+ if (IS_TILETYPE(tile, MP_RAILWAY) && _map_owner[tile] == tfdd->owner) {
+ if ((_map5[tile] & ~0x3) == 0xC0) {
+ if (length < tfdd->best_length) {
+ tfdd->best_length = length;
+ tfdd->tile = tile;
+ }
+ return true;
+ }
+
+ // make sure the train doesn't run against a oneway signal
+ if ((_map5[tile] & 0xC0) == 0x40) {
+ if (!(_map3_lo[tile] & _signal_onedir[track]) && _map3_lo[tile] & _signal_otherdir[track])
+ return true;
+ }
+ }
+
+ // stop searching if we've found a destination that is closer already.
+ return length >= tfdd->best_length;
+}
+
+// returns the tile of a depot to goto to
+static uint FindClosestTrainDepot(Vehicle *v)
+{
+ int i;
+ TrainFindDepotData tfdd;
+ uint tile = v->tile;
+
+ if (IsTrainDepotTile(tile))
+ return tile;
+
+ if (v->u.rail.track == 0x40) { tile = GetVehicleOutOfTunnelTile(v); }
+
+ tfdd.owner = v->owner;
+ tfdd.best_length = (uint)-1;
+
+ if (!_patches.new_depot_finding) {
+ // search in all directions
+ for(i=0; i!=4; i++)
+ NewTrainPathfind(tile, i, (TPFEnumProc*)TrainFindDepotEnumProc, &tfdd, NULL);
+ if (tfdd.best_length != (uint)-1)
+ return tfdd.tile;
+ } else {
+ // search in the forward direction first.
+ i = v->direction >> 1;
+ if (!(v->direction & 1) && v->u.rail.track != _state_dir_table[i]) { i = (i - 1) & 3; }
+ NewTrainPathfind(tile, i, (TPFEnumProc*)TrainFindDepotEnumProc, &tfdd, NULL);
+ if (tfdd.best_length != (uint)-1)
+ return tfdd.tile;
+
+ // search in backwards direction
+ i = (v->direction^4) >> 1;
+ if (!(v->direction & 1) && v->u.rail.track != _state_dir_table[i]) { i = (i - 1) & 3; }
+ NewTrainPathfind(tile, i, (TPFEnumProc*)TrainFindDepotEnumProc, &tfdd, NULL);
+ if (tfdd.best_length != (uint)-1)
+ return tfdd.tile;
+ }
+
+ return (uint)-1;
+}
+
+int32 CmdTrainGotoDepot(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+{
+ Vehicle *v = &_vehicles[p1];
+ uint depot_tile;
+
+ if ((v->next_order & OT_MASK) == OT_GOTO_DEPOT) {
+ if (flags & DC_EXEC) {
+ if (v->next_order & OF_UNLOAD) {
+ v->u.rail.days_since_order_progr = 0;
+ v->cur_order_index++;
+ }
+
+ v->next_order = OT_DUMMY;
+ InvalidateWindowWidget(WC_VEHICLE_VIEW, v->index, 4);
+ }
+ return 0;
+ }
+
+ depot_tile = FindClosestTrainDepot(v);
+ if (depot_tile == (uint)-1)
+ return_cmd_error(STR_883A_UNABLE_TO_FIND_ROUTE_TO);
+
+ if (flags & DC_EXEC) {
+ v->dest_tile = depot_tile;
+ v->next_order = OF_NON_STOP | OF_FULL_LOAD | OT_GOTO_DEPOT;
+ v->next_order_param = GetDepotByTile(depot_tile);
+ InvalidateWindowWidget(WC_VEHICLE_VIEW, v->index, 4);
+ }
+
+ return 0;
+}
+
+/* p1 = vehicle
+ * p2 = new service int
+ */
+int32 CmdChangeTrainServiceInt(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+{
+ Vehicle *v = &_vehicles[p1];
+
+ if (!CheckOwnership(v->owner))
+ return CMD_ERROR;
+
+ if (flags & DC_EXEC) {
+ v->service_interval = (uint16)p2;
+ InvalidateWindowWidget(WC_VEHICLE_DETAILS, v->index, 8);
+ }
+
+ return 0;
+}
+
+void OnTick_Train()
+{
+ _age_cargo_skip_counter = (_age_cargo_skip_counter == 0) ? 184 : (_age_cargo_skip_counter - 1);
+}
+
+static const int8 _vehicle_smoke_pos[16] = {
+ -4, -4, -4, 0, 4, 4, 4, 0,
+ -4, 0, 4, 4, 4, 0,-4,-4,
+};
+
+static void HandleLocomotiveSmokeCloud(Vehicle *v)
+{
+ Vehicle *u;
+
+ if (v->vehstatus & VS_TRAIN_SLOWING || v->load_unload_time_rem != 0 || v->cur_speed < 2)
+ return;
+
+ u = v;
+
+ do {
+ int engtype = v->engine_type;
+
+ // no smoke?
+ if (_rail_vehicle_info[engtype].flags & 2
+ || _engines[engtype].railtype > 0
+ || (v->vehstatus&VS_HIDDEN) || (v->u.rail.track & 0xC0) )
+ continue;
+
+ switch (_rail_vehicle_info[engtype].engclass) {
+ case 0:
+ // steam smoke.
+ if ( (v->tick_counter&0xF) == 0 && !IsTrainDepotTile(v->tile) && !IsTunnelTile(v->tile)) {
+ CreateEffectVehicleRel(v,
+ (_vehicle_smoke_pos[v->direction]),
+ (_vehicle_smoke_pos[v->direction+8]),
+ 10,
+ EV_STEAM_SMOKE);
+ }
+ break;
+
+ case 1:
+ // diesel smoke
+ if (u->cur_speed <= 40 && !IsTrainDepotTile(v->tile) && !IsTunnelTile(v->tile) && (uint16)Random() <= 0x1E00) {
+ CreateEffectVehicleRel(v, 0,0,10, EV_SMOKE_3);
+ }
+ break;
+
+ case 2:
+ // blue spark
+ if ( (v->tick_counter&0x3) == 0 && !IsTrainDepotTile(v->tile) && !IsTunnelTile(v->tile) && (uint16)Random() <= 0x5B0) {
+ CreateEffectVehicleRel(v, 0,0,10, EV_SMOKE_2);
+ }
+ break;
+ }
+ } while ( (v = v->next) != NULL );
+
+}
+
+static void TrainPlayLeaveStationSound(Vehicle *v)
+{
+ static const byte sfx[3] = { 0x2, 0x8, 0x8 };
+ int engtype = v->engine_type;
+
+ switch (_engines[engtype].railtype) {
+ case 0: SndPlayVehicleFx(sfx[_rail_vehicle_info[engtype].engclass], v); break;
+ case 1: SndPlayVehicleFx(0x41, v); break;
+ case 2: SndPlayVehicleFx(0x47, v); break;
+ }
+}
+
+static bool CheckTrainStayInDepot(Vehicle *v)
+{
+ Vehicle *u;
+ if (v->u.rail.track != 0x80) // first wagon (eg engine) in depot
+ return false;
+
+ // make sure that all vehicles are in the depot
+ u = GetLastVehicleInChain(v);
+ if (u->u.rail.track != 0x80)
+ return false;
+
+ // fix hung train if both ends are in depots (when here first wagon and last wagon is in depot)
+ // both first and last should be in the same depot, eg on the same tile
+ if (v->tile != u->tile)
+ return false;
+
+ if (v->u.rail.force_proceed == 0) {
+ if (++v->load_unload_time_rem < 37)
+ return true;
+ v->load_unload_time_rem = 0;
+
+ if (UpdateSignalsOnSegment(v->tile, v->direction))
+ return true;
+ }
+
+ TrainPlayLeaveStationSound(v);
+
+ v->u.rail.track = 1;
+ if (v->direction & 2)
+ v->u.rail.track = 2;
+
+ v->vehstatus &= ~VS_HIDDEN;
+ v->cur_speed = 0;
+
+ UpdateTrainDeltaXY(v, v->direction);
+ v->cur_image = GetTrainImage(v, v->direction);
+ VehiclePositionChanged(v);
+ UpdateSignalsOnSegment(v->tile, v->direction);
+ UpdateTrainAcceleration(v);
+ InvalidateWindow(WC_VEHICLE_DEPOT, v->tile);
+
+ return false;
+}
+
+typedef struct TrainTrackFollowerData {
+ TileIndex dest_coords;
+ int station_index; // station index we're heading for
+ uint best_bird_dist;
+ uint best_track_dist;
+ byte best_track;
+} TrainTrackFollowerData;
+
+static bool TrainTrackFollower(uint tile, TrainTrackFollowerData *ttfd, int track, uint length, byte *state){
+ if (IS_TILETYPE(tile, MP_RAILWAY) && (_map5[tile]&0xC0) == 0x40) {
+ // the tile has a signal
+ byte m3 = _map3_lo[tile];
+ if (!(m3 & _signal_onedir[track])) {
+ // if one way signal not pointing towards us, stop going in this direction.
+ if (m3 & _signal_otherdir[track])
+ return true;
+ } else if (_map2[tile] & _signal_onedir[track]) {
+ // green signal in our direction. either one way or two way.
+ *state = true;
+ } else if (m3 & _signal_otherdir[track]) {
+ // two way signal. unless we passed another green signal on the way,
+ // stop going in this direction.
+ if (!*state) return true;
+ }
+ }
+
+ // heading for nowhere?
+ if (ttfd->dest_coords == 0)
+ return false;
+
+ // did we reach the final station?
+ if (tile == ttfd->dest_coords ||
+ (IS_TILETYPE(tile, MP_STATION) && IS_BYTE_INSIDE(_map5[tile], 0, 8) && _map2[tile] == ttfd->station_index)) {
+ // found station
+ ttfd->best_bird_dist = 0;
+ if (length < ttfd->best_track_dist) {
+ ttfd->best_track_dist = length;
+ ttfd->best_track = state[1];
+ }
+ return true;
+ } else {
+ uint dist;
+
+ // we've actually found the destination already. no point searching in directions longer than this.
+ if (ttfd->best_track_dist != (uint)-1)
+ return length >= ttfd->best_track_dist;
+
+ // didn't find station
+ dist = GetTileDist(tile, ttfd->dest_coords);
+ if (dist < ttfd->best_bird_dist) {
+ ttfd->best_bird_dist = dist;
+ ttfd->best_track = state[1];
+ }
+ return false;
+ }
+}
+
+static void FillWithStationData(TrainTrackFollowerData *fd, Vehicle *v)
+{
+ uint tile;
+
+ fd->dest_coords = tile = v->dest_tile;
+ fd->station_index = -1;
+
+ if (IS_TILETYPE(tile, MP_STATION) && IS_BYTE_INSIDE(_map5[tile], 0, 8) )
+ fd->station_index = _map2[tile];
+}
+
+static const byte _initial_tile_subcoord[6][4][3] = {
+{{ 15, 8, 1 },{ 0, 0, 0 },{ 0, 8, 5 },{ 0, 0, 0 }},
+{{ 0, 0, 0 },{ 8, 0, 3 },{ 0, 0, 0 },{ 8,15, 7 }},
+{{ 0, 0, 0 },{ 7, 0, 2 },{ 0, 7, 6 },{ 0, 0, 0 }},
+{{ 15, 8, 2 },{ 0, 0, 0 },{ 0, 0, 0 },{ 8,15, 6 }},
+{{ 15, 7, 0 },{ 8, 0, 4 },{ 0, 0, 0 },{ 0, 0, 0 }},
+{{ 0, 0, 0 },{ 0, 0, 0 },{ 0, 8, 4 },{ 7,15, 0 }},
+};
+
+static const uint32 _reachable_tracks[4] = {
+ 0x10091009,
+ 0x00160016,
+ 0x05200520,
+ 0x2A002A00,
+};
+
+static const byte _search_directions[6][4] = {
+ { 0, 9, 2, 9 }, // track 1
+ { 9, 1, 9, 3 }, // track 2
+ { 9, 0, 3, 9 }, // track upper
+ { 1, 9, 9, 2 }, // track lower
+ { 3, 2, 9, 9 }, // track left
+ { 9, 9, 1, 0 }, // track right
+};
+
+static const byte _pick_track_table[6] = {1, 3, 2, 2, 0, 0};
+
+/* choose a track */
+static byte ChooseTrainTrack(Vehicle *v, uint tile, int direction, byte trackbits)
+{
+ TrainTrackFollowerData fd;
+ int bits = trackbits;
+ uint best_track;
+#if 0
+ int time = rdtsc();
+ static float f;
+#endif
+
+ assert( (bits & ~0x3F) == 0);
+
+ /* quick return in case only one possible direction is available */
+ if (KILL_FIRST_BIT(bits) == 0)
+ return FIND_FIRST_BIT(bits);
+
+ FillWithStationData(&fd, v);
+
+ if (_patches.new_pathfinding) {
+ fd.best_bird_dist = (uint)-1;
+ fd.best_track_dist = (uint)-1;
+ fd.best_track = 0xFF;
+ NewTrainPathfind(tile - _tileoffs_by_dir[direction], direction, (TPFEnumProc*)TrainTrackFollower, &fd, NULL);
+
+// printf("Train %d %s\n", v->unitnumber, fd.best_track_dist == -1 ? "NOTFOUND" : "FOUND");
+
+ if (fd.best_track == 0xff) {
+ // blaha
+ best_track = FIND_FIRST_BIT(bits);
+ } else {
+ best_track = fd.best_track & 7;
+ }
+ } else {
+ int i, r;
+ uint best_bird_dist = 0;
+ uint best_track_dist = 0;
+ byte train_dir = v->direction & 3;
+
+
+ best_track = -1;
+
+ do {
+ i = FIND_FIRST_BIT(bits);
+ bits = KILL_FIRST_BIT(bits);
+
+ fd.best_bird_dist = (uint)-1;
+ fd.best_track_dist = (uint)-1;
+
+ NewTrainPathfind(tile, _search_directions[i][direction], (TPFEnumProc*)TrainTrackFollower, &fd, NULL);
+ if (best_track != -1) {
+ if (best_track_dist == -1) {
+ if (fd.best_track_dist == -1) {
+ /* neither reached the destination, pick the one with the smallest bird dist */
+ if (fd.best_bird_dist > best_bird_dist) goto bad;
+ if (fd.best_bird_dist < best_bird_dist) goto good;
+ } else {
+ /* we found the destination for the first time */
+ goto good;
+ }
+ } else {
+ if (fd.best_track_dist == -1) {
+ /* didn't find destination, but we've found the destination previously */
+ goto bad;
+ } else {
+ /* both old & new reached the destination, compare track length */
+ if (fd.best_track_dist > best_track_dist) goto bad;
+ if (fd.best_track_dist < best_track_dist) goto good;
+ }
+ }
+
+ /* if we reach this position, there's two paths of equal value so far.
+ * pick one randomly. */
+ r = (byte)Random();
+ if (_pick_track_table[i] == train_dir) r += 80;
+ if (_pick_track_table[best_track] == train_dir) r -= 80;
+
+ if (r <= 127) goto bad;
+ }
+ good:;
+ best_track = i;
+ best_bird_dist = fd.best_bird_dist;
+ best_track_dist = fd.best_track_dist;
+ bad:;
+ } while (bits != 0);
+// printf("Train %d %s\n", v->unitnumber, best_track_dist == -1 ? "NOTFOUND" : "FOUND");
+ assert(best_track != -1);
+ }
+
+#if 0
+ time = rdtsc() - time;
+ f = f * 0.99 + 0.01 * time;
+ printf("PF time = %d %f\n", time, f);
+#endif
+
+ return best_track;
+}
+
+
+static bool CheckReverseTrain(Vehicle *v)
+{
+ TrainTrackFollowerData fd;
+ int i, r;
+ int best_track;
+ uint best_bird_dist = 0;
+ uint best_track_dist = 0;
+ uint reverse, reverse_best;
+
+ if (_opt.diff.line_reverse_mode != 0 ||
+ v->u.rail.track & 0xC0 ||
+ !(v->direction & 1))
+ return false;
+
+ FillWithStationData(&fd, v);
+
+ best_track = -1;
+ reverse_best = reverse = 0;
+
+ assert(v->u.rail.track);
+
+ i = _search_directions[FIND_FIRST_BIT(v->u.rail.track)][v->direction>>1];
+
+ while(true) {
+ fd.best_bird_dist = (uint)-1;
+ fd.best_track_dist = (uint)-1;
+
+ NewTrainPathfind(v->tile, reverse ^ i, (TPFEnumProc*)TrainTrackFollower, &fd, NULL);
+
+ if (best_track != -1) {
+ if (best_bird_dist != 0) {
+ if (fd.best_bird_dist != 0) {
+ /* neither reached the destination, pick the one with the smallest bird dist */
+ if (fd.best_bird_dist > best_bird_dist) goto bad;
+ if (fd.best_bird_dist < best_bird_dist) goto good;
+ } else {
+ /* we found the destination for the first time */
+ goto good;
+ }
+ } else {
+ if (fd.best_bird_dist != 0) {
+ /* didn't find destination, but we've found the destination previously */
+ goto bad;
+ } else {
+ /* both old & new reached the destination, compare track length */
+ if (fd.best_track_dist > best_track_dist) goto bad;
+ if (fd.best_track_dist < best_track_dist) goto good;
+ }
+ }
+
+ /* if we reach this position, there's two paths of equal value so far.
+ * pick one randomly. */
+ r = (byte)Random();
+ if (_pick_track_table[i] == (v->direction & 3)) r += 80;
+ if (_pick_track_table[best_track] == (v->direction & 3)) r -= 80;
+ if (r <= 127) goto bad;
+ }
+good:;
+ best_track = i;
+ best_bird_dist = fd.best_bird_dist;
+ best_track_dist = fd.best_track_dist;
+ reverse_best = reverse;
+bad:;
+ if (reverse != 0)
+ break;
+ reverse = 2;
+ }
+
+ return reverse_best != 0;
+}
+
+static bool ProcessTrainOrder(Vehicle *v)
+{
+ uint order;
+ bool result;
+
+ // These are un-interruptible
+ if ((v->next_order & OT_MASK) >= OT_GOTO_DEPOT && (v->next_order & OT_MASK) <= OT_LEAVESTATION) {
+
+ // Let a depot order in the schedule interrupt.
+ if ((v->next_order & (OT_MASK|OF_UNLOAD)) != (OT_GOTO_DEPOT|OF_UNLOAD))
+ return false;
+ }
+
+ if ((v->next_order & (OT_MASK|OF_UNLOAD|OF_FULL_LOAD)) == (OT_GOTO_DEPOT|OF_UNLOAD|OF_FULL_LOAD) &&
+ v->date_of_last_service+v->service_interval > _date) {
+ v->cur_order_index++;
+ }
+
+ // check if we've reached the checkpoint?
+ if ((v->next_order & OT_MASK) == OT_GOTO_CHECKPOINT && v->tile == v->dest_tile) {
+ v->cur_order_index++;
+ }
+
+ // check if we've reached a non-stop station while TTDPatch nonstop is enabled..
+ if (_patches.new_nonstop && (v->next_order & OF_NON_STOP) && v->next_order_param == _map2[v->tile]) {
+ v->cur_order_index++;
+ }
+
+ // Get the current order
+ if (v->cur_order_index >= v->num_orders)
+ v->cur_order_index = 0;
+ order = v->schedule_ptr[v->cur_order_index];
+
+ // If no order, do nothing.
+ if (order == 0) {
+ v->next_order = OT_NOTHING;
+ v->dest_tile = 0;
+ return false;
+ }
+
+ // If it is unchanged, keep it.
+ if (order == (uint)((v->next_order | (v->next_order_param<<8))))
+ return false;
+
+ // Otherwise set it, and determine the destination tile.
+ v->next_order = (byte)order;
+ v->next_order_param = (byte)(order >> 8);
+
+ v->dest_tile = 0;
+
+ result = false;
+ if ((order & OT_MASK) == OT_GOTO_STATION) {
+ if ( (byte)(order >> 8) == v->last_station_visited)
+ v->last_station_visited = 0xFF;
+ v->dest_tile = DEREF_STATION(order >> 8)->xy;
+ result = CheckReverseTrain(v);
+ } else if ((order & OT_MASK) == OT_GOTO_DEPOT) {
+ v->dest_tile = _depots[order >> 8].xy;
+ result = CheckReverseTrain(v);
+ } else if ((order & OT_MASK) == OT_GOTO_CHECKPOINT) {
+ v->dest_tile = _checkpoints[order >> 8].xy;
+ result = CheckReverseTrain(v);
+ }
+
+ InvalidateVehicleOrderWidget(v);
+
+ return result;
+}
+
+static void MarkTrainDirty(Vehicle *v)
+{
+ do {
+ v->cur_image = GetTrainImage(v, v->direction);
+ MarkAllViewportsDirty(v->left_coord, v->top_coord, v->right_coord + 1, v->bottom_coord + 1);
+ } while ( (v=v->next) != NULL);
+}
+
+static void HandleTrainLoading(Vehicle *v, bool mode)
+{
+ if (v->next_order == OT_NOTHING)
+ return;
+
+ if (v->next_order != OT_DUMMY) {
+ if ((v->next_order&OT_MASK) != OT_LOADING)
+ return;
+
+ if (mode)
+ return;
+
+ // don't mark the train as lost if we're loading on the final station.
+ if (v->next_order & OF_NON_STOP)
+ v->u.rail.days_since_order_progr = 0;
+
+ if (--v->load_unload_time_rem)
+ return;
+
+ if (v->next_order&OF_FULL_LOAD && CanFillVehicle(v)) {
+ SET_EXPENSES_TYPE(EXPENSES_TRAIN_INC);
+ if (LoadUnloadVehicle(v)) {
+ InvalidateWindow(WC_TRAINS_LIST, v->owner);
+ MarkTrainDirty(v);
+
+ // need to update acceleration since the goods on the train changed.
+ UpdateTrainAcceleration(v);
+ }
+ return;
+ }
+
+ TrainPlayLeaveStationSound(v);
+
+ {
+ byte b = v->next_order;
+ v->next_order = OT_LEAVESTATION;
+
+ // If this was not the final order, don't remove it from the list.
+ if (!(b & OF_NON_STOP))
+ return;
+ }
+ }
+
+ v->u.rail.days_since_order_progr = 0;
+ v->cur_order_index++;
+ InvalidateVehicleOrderWidget(v);
+}
+
+static int UpdateTrainSpeed(Vehicle *v)
+{
+ uint spd;
+ uint accel;
+
+ if (v->vehstatus & VS_STOPPED || v->u.rail.flags & VRF_REVERSING) {
+ accel = -v->acceleration * 2;
+ } else {
+ accel = v->acceleration;
+ if (_patches.realistic_acceleration) {
+ accel = GetRealisticAcceleration(v);
+ }
+ }
+
+ spd = v->subspeed + accel * 2;
+ v->subspeed = (byte)spd;
+ v->cur_speed = spd = clamp(v->cur_speed + ((int)spd >> 8), 0, v->max_speed);
+
+ if (!(v->direction & 1)) spd = spd * 3 >> 2;
+
+ spd += v->progress;
+ v->progress = (byte)spd;
+ return (spd >> 8);
+}
+
+static void TrainEnterStation(Vehicle *v, int station)
+{
+ Station *st;
+ uint32 flags;
+
+ v->last_station_visited = station;
+
+ /* check if a train ever visited this station before */
+ st = DEREF_STATION(station);
+ if (!(st->had_vehicle_of_type & HVOT_TRAIN)) {
+ st->had_vehicle_of_type |= HVOT_TRAIN;
+ SET_DPARAM16(0, st->index);
+ flags = (v->owner == _local_player) ? NEWS_FLAGS(NM_THIN, NF_VIEWPORT|NF_VEHICLE, NT_ARRIVAL_PLAYER, 0) : NEWS_FLAGS(NM_THIN, NF_VIEWPORT|NF_VEHICLE, NT_ARRIVAL_OTHER, 0);
+ AddNewsItem(
+ STR_8801_CITIZENS_CELEBRATE_FIRST,
+ flags,
+ v->index,
+ 0);
+ }
+
+ // Did we reach the final destination?
+ if ((v->next_order&OT_MASK) == OT_GOTO_STATION && v->next_order_param == (byte)station) {
+ // Yeah, keep the load/unload flags
+ // Non Stop now means if the order should be increased.
+ v->next_order = (v->next_order & (OF_FULL_LOAD|OF_UNLOAD)) | OF_NON_STOP | OT_LOADING;
+ } else {
+ // No, just do a simple load
+ v->next_order = OT_LOADING;
+ }
+ v->next_order_param = 0;
+
+ SET_EXPENSES_TYPE(EXPENSES_TRAIN_INC);
+ if (LoadUnloadVehicle(v) != 0) {
+ InvalidateWindow(WC_TRAINS_LIST, v->owner);
+ MarkTrainDirty(v);
+ UpdateTrainAcceleration(v);
+ }
+ InvalidateWindowWidget(WC_VEHICLE_VIEW, v->index, 4);
+}
+
+static byte AfterSetTrainPos(Vehicle *v)
+{
+ byte new_z, old_z;
+
+ // need this hint so it returns the right z coordinate on bridges.
+ _get_z_hint = v->z_pos;
+ new_z = GetSlopeZ(v->x_pos, v->y_pos);
+ _get_z_hint = 0;
+
+ old_z = v->z_pos;
+ v->z_pos = new_z;
+
+ v->u.rail.flags &= ~(VRF_GOINGUP | VRF_GOINGDOWN);
+
+ if (new_z != old_z) {
+ v->u.rail.flags |= (new_z > old_z) ? VRF_GOINGUP : VRF_GOINGDOWN;
+ }
+
+ VehiclePositionChanged(v);
+ EndVehicleMove(v);
+ return old_z;
+}
+
+static const byte _new_vehicle_direction_table[11] = {
+ 0, 7, 6, 0,
+ 1, 0, 5, 0,
+ 2, 3, 4,
+};
+
+static int GetNewVehicleDirectionByTile(uint new_tile, uint old_tile)
+{
+ uint offs = (GET_TILE_Y(new_tile) - GET_TILE_Y(old_tile) + 1) * 4 +
+ GET_TILE_X(new_tile) - GET_TILE_X(old_tile) + 1;
+ assert(offs < 11);
+ return _new_vehicle_direction_table[offs];
+}
+
+static int GetNewVehicleDirection(Vehicle *v, int x, int y)
+{
+ uint offs = (y - v->y_pos + 1) * 4 + (x - v->x_pos + 1);
+ assert(offs < 11);
+ return _new_vehicle_direction_table[offs];
+}
+
+static int GetDirectionToVehicle(Vehicle *v, int x, int y)
+{
+ byte offs;
+
+ x -= v->x_pos;
+ if (x >= 0) {
+ offs = (x > 2) ? 0 : 1;
+ } else {
+ offs = (x < -2) ? 2 : 1;
+ }
+
+ y -= v->y_pos;
+ if (y >= 0) {
+ offs += ((y > 2) ? 0 : 1) * 4;
+ } else {
+ offs += ((y < -2) ? 2 : 1) * 4;
+ }
+
+ assert(offs < 11);
+ return _new_vehicle_direction_table[offs];
+}
+
+/* Check if the vehicle is compatible with the specified tile */
+static bool CheckCompatibleRail(Vehicle *v, uint tile)
+{
+ if (IS_TILETYPE(tile, MP_RAILWAY) ||
+ IS_TILETYPE(tile, MP_STATION)) {
+
+ } else if (IS_TILETYPE(tile, MP_TUNNELBRIDGE)) {
+ if ((_map5[tile] & 0xC0) == 0xC0) {// is bridge middle part?
+ TileInfo ti;
+ FindLandscapeHeightByTile(&ti, tile);
+
+ // correct Z position of a train going under a bridge on slopes
+ if (CORRECT_Z(ti.tileh))
+ ti.z += 8;
+
+ if(v->z_pos != ti.z) // train is going over bridge
+ return true;
+ }
+ } else
+ return true;
+
+ if (_map_owner[tile] != v->owner ||
+ (v->subtype == 0 && (_map3_lo[tile] & 0xF) != v->u.rail.railtype))
+ return false;
+
+ return true;
+}
+
+typedef struct {
+ byte small_turn, large_turn;
+ byte z_up; // fraction to remove when moving up
+ byte z_down; // fraction to remove when moving down
+} RailtypeSlowdownParams;
+
+static const RailtypeSlowdownParams _railtype_slowdown[3] = {
+ // normal accel
+ {256/4, 256/2, 256/4, 2}, // normal
+ {256/4, 256/2, 256/4, 2}, // monorail
+ {0, 256/2, 256/4, 2}, // maglev
+};
+
+/* Modify the speed of the vehicle due to a turn */
+static void AffectSpeedByDirChange(Vehicle *v, byte new_dir)
+{
+ byte diff;
+ const RailtypeSlowdownParams *rsp;
+
+ if (_patches.realistic_acceleration || (diff = (v->direction - new_dir) & 7) == 0)
+ return;
+
+ rsp = &_railtype_slowdown[v->u.rail.railtype];
+ v->cur_speed -= ((diff == 1 || diff == 7) ? rsp->small_turn : rsp->large_turn) * v->cur_speed >> 8;
+}
+
+/* Modify the speed of the vehicle due to a change in altitude */
+static void AffectSpeedByZChange(Vehicle *v, byte old_z)
+{
+ const RailtypeSlowdownParams *rsp;
+ if (old_z == v->z_pos || _patches.realistic_acceleration)
+ return;
+
+ rsp = &_railtype_slowdown[v->u.rail.railtype];
+
+ if (old_z < v->z_pos) {
+ v->cur_speed -= (v->cur_speed * rsp->z_up >> 8);
+ } else {
+ uint16 spd = v->cur_speed + rsp->z_down;
+ if (spd <= v->max_speed)
+ v->cur_speed = spd;
+ }
+}
+
+static const byte _otherside_signal_directions[14] = {
+ 1, 3, 1, 3, 5, 3, 0, 0,
+ 5, 7, 7, 5, 7, 1,
+};
+
+static void TrainMovedChangeSignals(uint tile, int dir)
+{
+ int i;
+ if (IS_TILETYPE(tile, MP_RAILWAY) && (_map5[tile]&0xC0)==0x40) {
+ i = FindFirstBit2x64((_map5[tile]+(_map5[tile]<<8)) & _reachable_tracks[dir]);
+ UpdateSignalsOnSegment(tile, _otherside_signal_directions[i]);
+ }
+}
+
+
+typedef struct TrainCollideChecker {
+ Vehicle *v, *v_skip;
+
+} TrainCollideChecker;
+
+void *FindTrainCollideEnum(Vehicle *v, TrainCollideChecker *tcc)
+{
+ if (v == tcc->v || v == tcc->v_skip || v->type != VEH_Train || v->u.rail.track==0x80)
+ return 0;
+
+ if ( myabs(v->z_pos - tcc->v->z_pos) > 6 ||
+ myabs(v->x_pos - tcc->v->x_pos) >= 6 ||
+ myabs(v->y_pos - tcc->v->y_pos) >= 6)
+ return NULL;
+ return v;
+}
+
+static void SetVehicleCrashed(Vehicle *v)
+{
+ Vehicle *u;
+
+ if (v->u.rail.crash_anim_pos != 0)
+ return;
+
+ v->u.rail.crash_anim_pos++;
+
+ u = v;
+ BEGIN_ENUM_WAGONS(v)
+ v->vehstatus |= VS_CRASHED;
+ END_ENUM_WAGONS(v)
+
+ InvalidateWindowWidget(WC_VEHICLE_VIEW, u->index, 4);
+}
+
+static int CountPassengersInTrain(Vehicle *v)
+{
+ int num = 0;
+ BEGIN_ENUM_WAGONS(v)
+ if (v->cargo_type == 0) num += v->cargo_count;
+ END_ENUM_WAGONS(v)
+ return num;
+}
+
+static void CheckTrainCollision(Vehicle *v)
+{
+ TrainCollideChecker tcc;
+ Vehicle *coll;
+ int num;
+
+ /* can't collide in depot */
+ if (v->u.rail.track == 0x80)
+ return;
+
+ assert((uint)TILE_FROM_XY(v->x_pos, v->y_pos) == v->tile);
+
+ tcc.v = v;
+ tcc.v_skip = v->next;
+
+ /* find colliding vehicle */
+ coll = VehicleFromPos(v->tile, &tcc, (VehicleFromPosProc*)FindTrainCollideEnum);
+ if (coll == NULL)
+ return;
+
+ coll = GetFirstVehicleInChain(coll);
+
+ /* it can't collide with its own wagons */
+ if (v == coll)
+ return;
+
+ //two drivers + passangers killed in train v
+ num = 2 + CountPassengersInTrain(v);
+ if(!(coll->vehstatus&VS_CRASHED))
+ //two drivers + passangers killed in train coll (if it was not crashed already)
+ num += 2 + CountPassengersInTrain(coll);
+
+ SetVehicleCrashed(v);
+ if (coll->subtype == 0)
+ SetVehicleCrashed(coll);
+
+
+ SET_DPARAM16(0, num);
+
+ AddNewsItem(STR_8868_TRAIN_CRASH_DIE_IN_FIREBALL,
+ NEWS_FLAGS(NM_THIN, NF_VIEWPORT|NF_VEHICLE, NT_ACCIDENT, 0),
+ v->index,
+ 0);
+
+ ModifyStationRatingAround(v->tile, v->owner, -160, 30);
+ SndPlayVehicleFx(17, v);
+}
+
+static void *CheckVehicleAtSignal(Vehicle *v, void *data)
+{
+ uint32 d = (uint32)data;
+
+ if (v->type == VEH_Train && v->subtype == 0 && v->tile == (TileIndex)(d >> 8)) {
+ byte diff = (v->direction - (byte)d + 2) & 7;
+ if (diff == 2 || (v->cur_speed <= 5 && diff <= 4))
+ return (void*)1;
+ }
+ return 0;
+}
+
+static void TrainController(Vehicle *v)
+{
+ Vehicle *prev = NULL;
+ GetNewVehiclePosResult gp;
+ uint32 r, tracks,ts;
+ int dir, i;
+ byte chosen_dir;
+ byte chosen_track;
+ byte old_z;
+
+ for(;;) {
+ BeginVehicleMove(v);
+
+ if (v->u.rail.track != 0x40) {
+ if (GetNewVehiclePos(v, &gp)) {
+ /* Statying in the old tile */
+ if (v->u.rail.track == 0x80) {
+ /* inside depot */
+ gp.x = v->x_pos;
+ gp.y = v->y_pos;
+ } else {
+ /* isnot inside depot */
+ r = VehicleEnterTile(v, gp.new_tile, gp.x, gp.y);
+ if (r & 0x8)
+ goto invalid_rail;
+ if (r & 0x2) {
+ TrainEnterStation(v, r >> 8);
+ return;
+ }
+
+ if (v->next_order == OT_LEAVESTATION) {
+ v->next_order = OT_NOTHING;
+ InvalidateWindowWidget(WC_VEHICLE_VIEW, v->index, 4);
+ }
+ }
+ } else {
+ /* A new tile is about to be entered. */
+
+ /* Determine what direction we're entering the new tile from */
+ dir = GetNewVehicleDirectionByTile(gp.new_tile, gp.old_tile);
+ assert(dir==1 || dir==3 || dir==5 || dir==7);
+
+ /* Get the status of the tracks in the new tile and mask
+ * away the bits that aren't reachable. */
+ ts = GetTileTrackStatus(gp.new_tile, 0) & _reachable_tracks[dir >> 1];
+
+ /* Combine the from & to directions.
+ * Now, the lower byte contains the track status, and the byte at bit 16 contains
+ * the signal status. */
+ tracks = ts|(ts >> 8);
+ if ( (byte) tracks == 0)
+ goto invalid_rail;
+
+ /* Check if the new tile contrains tracks that are compatible
+ * with the current train, if not, bail out. */
+ if (!CheckCompatibleRail(v, gp.new_tile))
+ goto invalid_rail;
+
+ if (prev == NULL) {
+ /* Currently the locomotive is active. Determine which one of the
+ * available tracks to choose */
+ chosen_track = 1 << ChooseTrainTrack(v, gp.new_tile, dir>>1, (byte)tracks);
+
+ /* Check if it's a red signal and that force proceed is not clicked. */
+ if ( (tracks>>16)&chosen_track && v->u.rail.force_proceed == 0) goto red_light;
+ } else {
+ static byte _matching_tracks[8] = {0x30, 1, 0xC, 2, 0x30, 1, 0xC, 2};
+
+ /* The wagon is active, simply follow the prev vehicle. */
+ chosen_track = (byte)(_matching_tracks[GetDirectionToVehicle(prev, gp.x, gp.y)] & tracks);
+ }
+
+ /* make sure chosen track is a valid track */
+ assert(chosen_track==1 || chosen_track==2 || chosen_track==4 || chosen_track==8 || chosen_track==16 || chosen_track==32);
+
+ /* Update XY to reflect the entrance to the new tile, and select the direction to use */
+ {
+ const byte *b = _initial_tile_subcoord[FIND_FIRST_BIT(chosen_track)][dir>>1];
+ gp.x = (gp.x & ~0xF) | b[0];
+ gp.y = (gp.y & ~0xF) | b[1];
+ chosen_dir = b[2];
+ }
+
+ /* Call the landscape function and tell it that the vehicle entered the tile */
+ r = VehicleEnterTile(v, gp.new_tile, gp.x, gp.y);
+ if (r&0x8)
+ goto invalid_rail;
+
+ if (v->subtype == 0) v->load_unload_time_rem = 0;
+
+ if (!(r&0x4)) {
+ v->tile = gp.new_tile;
+ v->u.rail.track = chosen_track;
+ }
+
+ if (v->subtype == 0)
+ TrainMovedChangeSignals(gp.new_tile, dir>>1);
+
+ if (v->next == NULL)
+ TrainMovedChangeSignals(gp.old_tile, (dir>>1) ^ 2);
+
+ if (prev == NULL) {
+ AffectSpeedByDirChange(v, chosen_dir);
+ }
+
+ v->direction = chosen_dir;
+ }
+ } else {
+ /* in tunnel */
+ GetNewVehiclePos(v, &gp);
+
+ if (IS_TILETYPE(gp.new_tile, MP_TUNNELBRIDGE) &&
+ !(_map5[gp.new_tile] & 0xF0)) {
+ r = VehicleEnterTile(v, gp.new_tile, gp.x, gp.y);
+ if (r & 0x4) goto common;
+ }
+
+ v->x_pos = gp.x;
+ v->y_pos = gp.y;
+ VehiclePositionChanged(v);
+ goto next_vehicle;
+ }
+common:;
+
+ /* update image of train, as well as delta XY */
+ dir = GetNewVehicleDirection(v, gp.x, gp.y);
+ UpdateTrainDeltaXY(v, dir);
+ v->cur_image = GetTrainImage(v, dir);
+
+ v->x_pos = gp.x;
+ v->y_pos = gp.y;
+
+ /* update the Z position of the vehicle */
+ old_z = AfterSetTrainPos(v);
+
+ if (prev == NULL) {
+ AffectSpeedByZChange(v, old_z);
+ CheckTrainCollision(v);
+ }
+
+ /* continue with next vehicle */
+next_vehicle:;
+ prev = v;
+ if ((v=v->next) == NULL)
+ return;
+ }
+
+invalid_rail:
+ if (prev != NULL) {
+ error("!Disconnecting train");
+ }
+ goto reverse_train_direction;
+
+red_light: {
+ /* find the first set bit in ts. need to do it in 2 steps, since
+ * FIND_FIRST_BIT only handles 6 bits at a time. */
+ i = FindFirstBit2x64(ts);
+
+ if (!(_map3_lo[gp.new_tile] & _signal_otherdir[i])) {
+ v->cur_speed = 0;
+ v->subspeed = 0;
+ v->progress = 255-100;
+ if (++v->load_unload_time_rem < _patches.wait_oneway_signal * 20)
+ return;
+ } else if (_map3_lo[gp.new_tile] & _signal_onedir[i]){
+ v->cur_speed = 0;
+ v->subspeed = 0;
+ v->progress = 255-10;
+ if (++v->load_unload_time_rem < _patches.wait_twoway_signal * 73) {
+ uint o_tile = gp.new_tile + _tileoffs_by_dir[dir>>1];
+ /* check if a train is waiting on the other side */
+ if (VehicleFromPos(o_tile, (void*)( (o_tile<<8) | (dir^4)), (VehicleFromPosProc*)CheckVehicleAtSignal) == NULL)
+ return;
+ }
+ }
+ }
+
+reverse_train_direction:
+ v->load_unload_time_rem = 0;
+ v->cur_speed = 0;
+ v->subspeed = 0;
+ ReverseTrainDirection(v);
+
+}
+
+static void DeleteLastWagon(Vehicle *v)
+{
+ Vehicle *u = v;
+ int t;
+
+ while (v->next != NULL) {
+ u = v;
+ v = v->next;
+ }
+ u->next = NULL;
+
+ InvalidateWindow(WC_VEHICLE_DETAILS, v->index);
+ DeleteWindowById(WC_VEHICLE_VIEW, v->index);
+ InvalidateWindow(WC_TRAINS_LIST, v->owner);
+ InvalidateWindow(WC_COMPANY, v->owner);
+
+ BeginVehicleMove(v);
+ EndVehicleMove(v);
+ DeleteVehicle(v);
+
+ if (!((t=v->u.rail.track) & 0xC0)) {
+ SetSignalsOnBothDir(v->tile, FIND_FIRST_BIT(t));
+ }
+}
+
+static void ChangeTrainDirRandomly(Vehicle *v)
+{
+ static int8 _random_dir_change[4] = { -1, 0, 0, 1};
+
+ do {
+ v->direction = (v->direction + _random_dir_change[Random()&3]) & 7;
+ if (!(v->vehstatus & VS_HIDDEN)) {
+ BeginVehicleMove(v);
+ UpdateTrainDeltaXY(v, v->direction);
+ v->cur_image = GetTrainImage(v, v->direction);
+ AfterSetTrainPos(v);
+ }
+ } while ( (v=v->next) != NULL);
+}
+
+static void HandleCrashedTrain(Vehicle *v)
+{
+ int state = ++v->u.rail.crash_anim_pos, index;
+ uint32 r;
+ Vehicle *u;
+
+ if (state == 4) {
+ CreateEffectVehicleRel(v, 4, 4, 8, EV_CRASHED_SMOKE);
+ }
+
+ if (state <= 200 && (uint16)(r=Random()) <= 0x2492) {
+ index = (r * 10 >> 16);
+
+ u = v;
+ do {
+ if (--index < 0) {
+ r = Random();
+
+ CreateEffectVehicleRel(u,
+ 2 + ((r>>8)&7),
+ 2 + ((r>>16)&7),
+ 5 + (r&7),
+ EV_DEMOLISH);
+ break;
+ }
+ } while ( (u=u->next) != NULL);
+ }
+
+ if (state <= 240 && !(v->tick_counter&3)) {
+ ChangeTrainDirRandomly(v);
+ }
+
+ if (state >= 4440 && !(v->tick_counter&0x1F))
+ DeleteLastWagon(v);
+}
+
+static void HandleBrokenTrain(Vehicle *v)
+{
+ if (v->breakdown_ctr != 1) {
+ v->breakdown_ctr = 1;
+ v->cur_speed = 0;
+
+ if (v->breakdowns_since_last_service != 255)
+ v->breakdowns_since_last_service++;
+
+ InvalidateWindow(WC_VEHICLE_VIEW, v->index);
+ InvalidateWindow(WC_VEHICLE_DETAILS, v->index);
+
+ SndPlayVehicleFx((_opt.landscape != LT_CANDY) ? 0xE : 0x3A, v);
+
+ if (!(v->vehstatus & VS_HIDDEN)) {
+ Vehicle *u = CreateEffectVehicleRel(v, 4, 4, 5, EV_BREAKDOWN_SMOKE);
+ if (u)
+ u->u.special.unk0 = v->breakdown_delay * 2;
+ }
+ }
+
+ if (!(v->tick_counter & 3)) {
+ if (!--v->breakdown_delay) {
+ v->breakdown_ctr = 0;
+ InvalidateWindow(WC_VEHICLE_VIEW, v->index);
+ }
+ }
+}
+
+static const byte _breakdown_speeds[16] = {
+ 225, 210, 195, 180, 165, 150, 135, 120, 105, 90, 75, 60, 45, 30, 15, 15
+};
+
+static void TrainCheckIfLineEnds(Vehicle *v)
+{
+ uint tile;
+ uint x,y;
+ int t;
+ uint32 ts;
+
+ if ((uint)(t=v->breakdown_ctr) > 1) {
+ v->vehstatus |= VS_TRAIN_SLOWING;
+
+ t = _breakdown_speeds[ ((~t) >> 4) & 0xF];
+ if ((uint16)t <= v->cur_speed)
+ v->cur_speed = t;
+ } else {
+ v->vehstatus &= ~VS_TRAIN_SLOWING;
+ }
+
+ // exit if inside a tunnel
+ if (v->u.rail.track & 0x40)
+ return;
+
+ tile = v->tile;
+
+ // tunnel entrance?
+ if (IS_TILETYPE(tile, MP_TUNNELBRIDGE) &&
+ (_map5[tile] & 0xF0) == 0 && (byte)((_map5[tile] & 3)*2+1) == v->direction)
+ return;
+
+ // depot?
+ if (IS_TILETYPE(tile, MP_RAILWAY) && (_map5[tile] & 0xFC) == 0xC0)
+ return;
+
+ // determine the tracks on the next tile.
+ t = v->direction >> 1;
+ if (!(v->direction & 1) && v->u.rail.track != _state_dir_table[t]) {
+ t = (t - 1) & 3;
+ }
+ tile += _tileoffs_by_dir[t];
+ ts = GetTileTrackStatus(tile, 0) & _reachable_tracks[t];
+
+ x = v->x_pos & 0xF;
+ y = v->y_pos & 0xF;
+
+ switch(v->direction) {
+ case 0:
+ x = (~x) + (~y) + 24;
+ break;
+ case 7:
+ x = y;
+ /* fall through */
+ case 1:
+ x = (~x) + 16;
+ break;
+ case 2:
+ x = (~x) + y + 8;
+ break;
+ case 3:
+ x = y;
+ break;
+ case 4:
+ x = x + y - 8;
+ break;
+ case 6:
+ x = (~y) + x + 8;
+ break;
+ }
+
+ if ( (uint16)ts != 0) {
+ if ((ts &= (ts >> 16)) == 0) {
+ // make a rail/road crossing red
+ if (IS_TILETYPE(tile, MP_STREET) && (_map5[tile] & 0xF0)==0x10) {
+ if (!(_map5[tile] & 4)) {
+ _map5[tile] |= 4;
+ SndPlayVehicleFx(12, v);
+ MarkTileDirtyByTile(tile);
+ }
+ }
+ return;
+ }
+ } else if (x + 4 > 15) {
+ v->cur_speed = 0;
+ ReverseTrainDirection(v);
+ return;
+ }
+
+ // slow down
+ v->vehstatus |= VS_TRAIN_SLOWING;
+ t = _breakdown_speeds[x & 0xF];
+ if (!(v->direction&1)) t>>=1;
+ if ((uint16)t < v->cur_speed)
+ v->cur_speed = t;
+}
+
+static void TrainLocoHandler(Vehicle *v, bool mode)
+{
+ int j;
+
+ /* train has crashed? */
+ if (v->u.rail.crash_anim_pos != 0) {
+ if (!mode) HandleCrashedTrain(v);
+ return;
+ }
+
+ if (v->u.rail.force_proceed != 0)
+ v->u.rail.force_proceed--;
+
+ /* train is broken down? */
+ if (v->breakdown_ctr != 0) {
+ if (v->breakdown_ctr <= 2) {
+ HandleBrokenTrain(v);
+ return;
+ }
+ v->breakdown_ctr--;
+ }
+
+ if (v->u.rail.flags & VRF_REVERSING && v->cur_speed == 0) {
+ ReverseTrainDirection(v);
+ }
+
+ /* exit if train is stopped */
+ if (v->vehstatus & VS_STOPPED && v->cur_speed == 0)
+ return;
+
+
+ if (ProcessTrainOrder(v)) {
+ v->load_unload_time_rem = 0;
+ v->cur_speed = 0;
+ v->subspeed = 0;
+ ReverseTrainDirection(v);
+ return;
+ }
+
+ HandleTrainLoading(v, mode);
+
+ if ((v->next_order & OT_MASK) == OT_LOADING)
+ return;
+
+ if (CheckTrainStayInDepot(v))
+ return;
+
+ if (!mode) HandleLocomotiveSmokeCloud(v);
+
+ j = UpdateTrainSpeed(v);
+ if (j == 0) {
+ // if the vehicle has speed 0, update the last_speed field.
+ if (v->cur_speed != 0)
+ return;
+ } else {
+ TrainCheckIfLineEnds(v);
+
+ do {
+ TrainController(v);
+ if (v->cur_speed <= 0x100)
+ break;
+ } while (--j != 0);
+ }
+
+ SetLastSpeed(v, v->cur_speed);
+}
+
+
+void Train_Tick(Vehicle *v)
+{
+ if (_age_cargo_skip_counter == 0 && v->cargo_days != 0xff)
+ v->cargo_days++;
+
+ v->tick_counter++;
+
+ if (v->subtype == 0) {
+ TrainLocoHandler(v, false);
+
+ // make sure vehicle wasn't deleted.
+ if (v->type == VEH_Train && v->subtype == 0)
+ TrainLocoHandler(v, true);
+ }
+}
+
+
+static const byte _depot_track_ind[4] = {0,1,0,1};
+
+void TrainEnterDepot(Vehicle *v, uint tile)
+{
+ byte t;
+
+ SetSignalsOnBothDir(tile, _depot_track_ind[_map5[tile]&3]);
+
+ if (v->subtype != 0)
+ v = GetFirstVehicleInChain(v);
+
+ v->date_of_last_service = _date;
+ v->breakdowns_since_last_service = 0;
+ v->reliability = _engines[v->engine_type].reliability;
+ InvalidateWindow(WC_VEHICLE_DETAILS, v->index);
+
+ v->load_unload_time_rem = 0;
+ v->cur_speed = 0;
+
+ MaybeRenewVehicle(v, EstimateTrainCost(&_rail_vehicle_info[v->engine_type]));
+
+ if ((v->next_order&OT_MASK) == OT_GOTO_DEPOT) {
+ InvalidateWindow(WC_VEHICLE_VIEW, v->index);
+
+ t = v->next_order;
+ v->next_order = OT_DUMMY;
+
+ // Part of the schedule?
+ if (t & OF_UNLOAD) { v->u.rail.days_since_order_progr = 0; v->cur_order_index++; }
+
+ // User initiated?
+ else if (t & OF_FULL_LOAD) {
+ v->vehstatus |= VS_STOPPED;
+ if (v->owner == _local_player) {
+ SET_DPARAM16(0, v->unitnumber);
+ AddNewsItem(
+ STR_8814_TRAIN_IS_WAITING_IN_DEPOT,
+ NEWS_FLAGS(NM_SMALL, NF_VIEWPORT|NF_VEHICLE, NT_ADVICE, 0),
+ v->index,
+ 0);
+ }
+ }
+ }
+}
+
+static void CheckIfTrainNeedsService(Vehicle *v)
+{
+ uint tile;
+ byte depot;
+
+ if (_patches.no_train_service && IS_HUMAN_PLAYER(v->owner))
+ return;
+
+ if (v->date_of_last_service + v->service_interval > _date)
+ return;
+
+ if (v->vehstatus & VS_STOPPED)
+ return;
+
+ if (_patches.gotodepot && IS_HUMAN_PLAYER(v->owner) && ScheduleHasDepotOrders(v->schedule_ptr))
+ return;
+
+ // Don't interfere with a depot visit scheduled by the user, or a
+ // depot visit by the order list.
+ if ((v->next_order & OT_MASK) == OT_GOTO_DEPOT &&
+ (v->next_order & (OF_FULL_LOAD|OF_UNLOAD)) != 0)
+ return;
+
+ tile = FindClosestTrainDepot(v);
+ if (tile == (uint)-1 || GetTileDist(v->tile, tile) > 12) {
+ if ((v->next_order & OT_MASK) == OT_GOTO_DEPOT) {
+ v->next_order = OT_DUMMY;
+ InvalidateWindowWidget(WC_VEHICLE_VIEW, v->index, 4);
+ }
+ return;
+ }
+
+ depot = GetDepotByTile(tile);
+
+ if ((v->next_order & OT_MASK) == OT_GOTO_DEPOT && v->next_order_param != depot && !CHANCE16(3,16))
+ return;
+
+ v->next_order = OT_GOTO_DEPOT | OF_NON_STOP;
+ v->next_order_param = depot;
+ v->dest_tile = tile;
+ InvalidateWindowWidget(WC_VEHICLE_VIEW, v->index, 4);
+}
+
+int32 GetTrainRunningCost(Vehicle *v)
+{
+ int32 cost = 0;
+
+ do {
+ const RailVehicleInfo *rvi = &_rail_vehicle_info[v->engine_type];
+ if (rvi->running_cost_base)
+ cost += rvi->running_cost_base * _price.running_rail[rvi->engclass];
+ } while ( (v=v->next) != NULL );
+
+ return cost;
+}
+
+void OnNewDay_Train(Vehicle *v)
+{
+ TileIndex tile;
+
+ if ((++v->day_counter & 7) == 0)
+ DecreaseVehicleValue(v);
+
+ if (v->subtype == 0) {
+ CheckVehicleBreakdown(v);
+ AgeVehicle(v);
+
+ CheckIfTrainNeedsService(v);
+
+ // check if train hasn't advanced in its order list for a set number of days
+ if (_patches.lost_train_days && v->num_orders && !(v->vehstatus & VS_STOPPED) && ++v->u.rail.days_since_order_progr >= _patches.lost_train_days && v->owner == _local_player) {
+ v->u.rail.days_since_order_progr = 0;
+ SET_DPARAM16(0, v->unitnumber);
+ AddNewsItem(
+ STR_TRAIN_IS_LOST,
+ NEWS_FLAGS(NM_SMALL, NF_VIEWPORT|NF_VEHICLE, NT_ADVICE, 0),
+ v->index,
+ 0);
+ }
+
+ /* update destination */
+ if ((v->next_order & OT_MASK) == OT_GOTO_STATION &&
+ (tile=DEREF_STATION(v->next_order_param)->train_tile) != 0)
+ v->dest_tile = tile;
+
+ if ((v->vehstatus & VS_STOPPED) == 0) {
+ /* running costs */
+ int32 cost = GetTrainRunningCost(v) / 364;
+
+ v->profit_this_year -= cost >> 8;
+
+ SET_EXPENSES_TYPE(EXPENSES_TRAIN_RUN);
+ SubtractMoneyFromPlayerFract(v->owner, cost);
+
+ InvalidateWindow(WC_VEHICLE_DETAILS, v->index);
+ InvalidateWindow(WC_TRAINS_LIST, v->owner);
+ }
+ }
+}
+
+void TrainsYearlyLoop()
+{
+ Vehicle *v;
+
+ FOR_ALL_VEHICLES(v) {
+ if (v->type == VEH_Train && v->subtype == 0) {
+
+ // show warning if train is not generating enough income last 2 years (corresponds to a red icon in the vehicle list)
+ if (_patches.train_income_warn && v->owner == _local_player && v->age >= 730 && v->profit_this_year < 0) {
+ SET_DPARAM32(1, v->profit_this_year);
+ SET_DPARAM16(0, v->unitnumber);
+ AddNewsItem(
+ STR_TRAIN_IS_UNPROFITABLE,
+ NEWS_FLAGS(NM_SMALL, NF_VIEWPORT|NF_VEHICLE, NT_ADVICE, 0),
+ v->index,
+ 0);
+ }
+
+ v->profit_last_year = v->profit_this_year;
+ v->profit_this_year = 0;
+ InvalidateWindow(WC_VEHICLE_DETAILS, v->index);
+ }
+ }
+}
+
+extern void ShowTrainViewWindow(Vehicle *v);
+
+void HandleClickOnTrain(Vehicle *v)
+{
+ if (v->subtype != 0) v = GetFirstVehicleInChain(v);
+ ShowTrainViewWindow(v);
+}
+
+void InitializeTrains()
+{
+ _age_cargo_skip_counter = 1;
+}
+
+int ScheduleHasDepotOrders(uint16 *schedule)
+{
+ for (;*schedule!=0;schedule++)
+ if ((*schedule&OT_MASK) == OT_GOTO_DEPOT)
+ return true;
+ return false;
+}
generated by cgit v1.2.3-54-g00ecf (git 2.44.0) at 2024-07-15 06:52:25 +0000