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Codechange: Don't use a global for the terrforming error tile.

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This commit is contained in:
Michael Lutz
2021-12-01 00:44:57 +01:00
parent 2e39637db2
commit c521b965bd
7 changed files with 46 additions and 54 deletions
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76
src/terraform_cmd.cpp
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@@ -38,8 +38,6 @@ struct TerraformerState {
TileIndexToHeightMap tile_to_new_height; ///< The tiles for which the height has changed.
};
TileIndex _terraform_err_tile; ///< first tile we couldn't terraform
/**
* Gets the TileHeight (height of north corner) of a tile as of current terraforming progress.
*
@@ -101,20 +99,20 @@ static void TerraformAddDirtyTileAround(TerraformerState *ts, TileIndex tile)
* @param height Aimed height.
* @return Error code or cost.
*/
static CommandCost TerraformTileHeight(TerraformerState *ts, TileIndex tile, int height)
static std::tuple<CommandCost, TileIndex> TerraformTileHeight(TerraformerState *ts, TileIndex tile, int height)
{
assert(tile < MapSize());
/* Check range of destination height */
if (height < 0) return_cmd_error(STR_ERROR_ALREADY_AT_SEA_LEVEL);
if (height > _settings_game.construction.map_height_limit) return_cmd_error(STR_ERROR_TOO_HIGH);
if (height < 0) return { CommandCost(STR_ERROR_ALREADY_AT_SEA_LEVEL), INVALID_TILE };
if (height > _settings_game.construction.map_height_limit) return { CommandCost(STR_ERROR_TOO_HIGH), INVALID_TILE };
/*
* Check if the terraforming has any effect.
* This can only be true, if multiple corners of the start-tile are terraformed (i.e. the terraforming is done by towns/industries etc.).
* In this case the terraforming should fail. (Don't know why.)
*/
if (height == TerraformGetHeightOfTile(ts, tile)) return CMD_ERROR;
if (height == TerraformGetHeightOfTile(ts, tile)) return { CMD_ERROR, INVALID_TILE };
/* Check "too close to edge of map". Only possible when freeform-edges is off. */
uint x = TileX(tile);
@@ -125,8 +123,7 @@ static CommandCost TerraformTileHeight(TerraformerState *ts, TileIndex tile, int
*/
if (x == 1) x = 0;
if (y == 1) y = 0;
_terraform_err_tile = TileXY(x, y);
return_cmd_error(STR_ERROR_TOO_CLOSE_TO_EDGE_OF_MAP);
return { CommandCost(STR_ERROR_TOO_CLOSE_TO_EDGE_OF_MAP), TileXY(x, y) };
}
/* Mark incident tiles that are involved in the terraforming. */
@@ -168,14 +165,14 @@ static CommandCost TerraformTileHeight(TerraformerState *ts, TileIndex tile, int
if (abs(height_diff) > 1) {
/* Terraform the neighboured corner. The resulting height difference should be 1. */
height_diff += (height_diff < 0 ? 1 : -1);
CommandCost cost = TerraformTileHeight(ts, tile, r + height_diff);
if (cost.Failed()) return cost;
auto [cost, err_tile] = TerraformTileHeight(ts, tile, r + height_diff);
if (cost.Failed()) return { cost, err_tile };
total_cost.AddCost(cost);
}
}
}
return total_cost;
return { total_cost, INVALID_TILE };
}
/**
@@ -186,10 +183,8 @@ static CommandCost TerraformTileHeight(TerraformerState *ts, TileIndex tile, int
* @param dir_up direction; eg up (true) or down (false)
* @return the cost of this operation or an error
*/
CommandCost CmdTerraformLand(DoCommandFlag flags, TileIndex tile, Slope slope, bool dir_up)
std::tuple<CommandCost, Money, TileIndex> CmdTerraformLand(DoCommandFlag flags, TileIndex tile, Slope slope, bool dir_up)
{
_terraform_err_tile = INVALID_TILE;
CommandCost total_cost(EXPENSES_CONSTRUCTION);
int direction = (dir_up ? 1 : -1);
TerraformerState ts;
@@ -197,29 +192,29 @@ CommandCost CmdTerraformLand(DoCommandFlag flags, TileIndex tile, Slope slope, b
/* Compute the costs and the terraforming result in a model of the landscape */
if ((slope & SLOPE_W) != 0 && tile + TileDiffXY(1, 0) < MapSize()) {
TileIndex t = tile + TileDiffXY(1, 0);
CommandCost cost = TerraformTileHeight(&ts, t, TileHeight(t) + direction);
if (cost.Failed()) return cost;
auto [cost, err_tile] = TerraformTileHeight(&ts, t, TileHeight(t) + direction);
if (cost.Failed()) return { cost, 0, err_tile };
total_cost.AddCost(cost);
}
if ((slope & SLOPE_S) != 0 && tile + TileDiffXY(1, 1) < MapSize()) {
TileIndex t = tile + TileDiffXY(1, 1);
CommandCost cost = TerraformTileHeight(&ts, t, TileHeight(t) + direction);
if (cost.Failed()) return cost;
auto [cost, err_tile] = TerraformTileHeight(&ts, t, TileHeight(t) + direction);
if (cost.Failed()) return { cost, 0, err_tile };
total_cost.AddCost(cost);
}
if ((slope & SLOPE_E) != 0 && tile + TileDiffXY(0, 1) < MapSize()) {
TileIndex t = tile + TileDiffXY(0, 1);
CommandCost cost = TerraformTileHeight(&ts, t, TileHeight(t) + direction);
if (cost.Failed()) return cost;
auto [cost, err_tile] = TerraformTileHeight(&ts, t, TileHeight(t) + direction);
if (cost.Failed()) return { cost, 0, err_tile };
total_cost.AddCost(cost);
}
if ((slope & SLOPE_N) != 0) {
TileIndex t = tile + TileDiffXY(0, 0);
CommandCost cost = TerraformTileHeight(&ts, t, TileHeight(t) + direction);
if (cost.Failed()) return cost;
auto [cost, err_tile] = TerraformTileHeight(&ts, t, TileHeight(t) + direction);
if (cost.Failed()) return { cost, 0, err_tile };
total_cost.AddCost(cost);
}
@@ -259,20 +254,17 @@ CommandCost CmdTerraformLand(DoCommandFlag flags, TileIndex tile, Slope slope, b
/* Check if bridge would take damage. */
if (direction == 1 && bridge_height <= z_max) {
_terraform_err_tile = t; // highlight the tile under the bridge
return_cmd_error(STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST);
return { CommandCost(STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST), 0, t }; // highlight the tile under the bridge
}
/* Is the bridge above not too high afterwards? */
if (direction == -1 && bridge_height > (z_min + _settings_game.construction.max_bridge_height)) {
_terraform_err_tile = t;
return_cmd_error(STR_ERROR_BRIDGE_TOO_HIGH_AFTER_LOWER_LAND);
return { CommandCost(STR_ERROR_BRIDGE_TOO_HIGH_AFTER_LOWER_LAND), 0, t };
}
}
/* Check if tunnel would take damage */
if (direction == -1 && IsTunnelInWay(t, z_min)) {
_terraform_err_tile = t; // highlight the tile above the tunnel
return_cmd_error(STR_ERROR_EXCAVATION_WOULD_DAMAGE);
return { CommandCost(STR_ERROR_EXCAVATION_WOULD_DAMAGE), 0, t }; // highlight the tile above the tunnel
}
}
@@ -296,8 +288,7 @@ CommandCost CmdTerraformLand(DoCommandFlag flags, TileIndex tile, Slope slope, b
}
old_generating_world.Restore();
if (cost.Failed()) {
_terraform_err_tile = t;
return cost;
return { cost, 0, t };
}
if (pass == 1) total_cost.AddCost(cost);
}
@@ -305,7 +296,7 @@ CommandCost CmdTerraformLand(DoCommandFlag flags, TileIndex tile, Slope slope, b
Company *c = Company::GetIfValid(_current_company);
if (c != nullptr && GB(c->terraform_limit, 16, 16) < ts.tile_to_new_height.size()) {
return_cmd_error(STR_ERROR_TERRAFORM_LIMIT_REACHED);
return { CommandCost(STR_ERROR_TERRAFORM_LIMIT_REACHED), 0, INVALID_TILE };
}
if (flags & DC_EXEC) {
@@ -328,7 +319,7 @@ CommandCost CmdTerraformLand(DoCommandFlag flags, TileIndex tile, Slope slope, b
if (c != nullptr) c->terraform_limit -= (uint32)ts.tile_to_new_height.size() << 16;
}
return total_cost;
return { total_cost, 0, total_cost.Succeeded() ? tile : INVALID_TILE };
}
@@ -341,11 +332,9 @@ CommandCost CmdTerraformLand(DoCommandFlag flags, TileIndex tile, Slope slope, b
* @param LevelMode Mode of leveling \c LevelMode.
* @return the cost of this operation or an error
*/
std::tuple<CommandCost, Money> CmdLevelLand(DoCommandFlag flags, TileIndex tile, TileIndex start_tile, bool diagonal, LevelMode lm)
std::tuple<CommandCost, Money, TileIndex> CmdLevelLand(DoCommandFlag flags, TileIndex tile, TileIndex start_tile, bool diagonal, LevelMode lm)
{
if (start_tile >= MapSize()) return { CMD_ERROR, 0 };
_terraform_err_tile = INVALID_TILE;
if (start_tile >= MapSize()) return { CMD_ERROR, 0, INVALID_TILE };
/* remember level height */
uint oldh = TileHeight(start_tile);
@@ -356,11 +345,11 @@ std::tuple<CommandCost, Money> CmdLevelLand(DoCommandFlag flags, TileIndex tile,
case LM_LEVEL: break;
case LM_RAISE: h++; break;
case LM_LOWER: h--; break;
default: return { CMD_ERROR, 0 };
default: return { CMD_ERROR, 0, INVALID_TILE };
}
/* Check range of destination height */
if (h > _settings_game.construction.map_height_limit) return { CommandCost(oldh == 0 ? STR_ERROR_ALREADY_AT_SEA_LEVEL : STR_ERROR_TOO_HIGH), 0 };
if (h > _settings_game.construction.map_height_limit) return { CommandCost(oldh == 0 ? STR_ERROR_ALREADY_AT_SEA_LEVEL : STR_ERROR_TOO_HIGH), 0, INVALID_TILE };
Money money = GetAvailableMoneyForCommand();
CommandCost cost(EXPENSES_CONSTRUCTION);
@@ -369,14 +358,16 @@ std::tuple<CommandCost, Money> CmdLevelLand(DoCommandFlag flags, TileIndex tile,
const Company *c = Company::GetIfValid(_current_company);
int limit = (c == nullptr ? INT32_MAX : GB(c->terraform_limit, 16, 16));
if (limit == 0) return { CommandCost(STR_ERROR_TERRAFORM_LIMIT_REACHED), 0 };
if (limit == 0) return { CommandCost(STR_ERROR_TERRAFORM_LIMIT_REACHED), 0, INVALID_TILE };
TileIndex error_tile = INVALID_TILE;
TileIterator *iter = diagonal ? (TileIterator *)new DiagonalTileIterator(tile, start_tile) : new OrthogonalTileIterator(tile, start_tile);
for (; *iter != INVALID_TILE; ++(*iter)) {
TileIndex t = *iter;
uint curh = TileHeight(t);
while (curh != h) {
CommandCost ret = Command<CMD_TERRAFORM_LAND>::Do(flags & ~DC_EXEC, t, SLOPE_N, curh <= h);
CommandCost ret;
std::tie(ret, std::ignore, error_tile) = Command<CMD_TERRAFORM_LAND>::Do(flags & ~DC_EXEC, t, SLOPE_N, curh <= h);
if (ret.Failed()) {
last_error = ret;
@@ -389,7 +380,7 @@ std::tuple<CommandCost, Money> CmdLevelLand(DoCommandFlag flags, TileIndex tile,
money -= ret.GetCost();
if (money < 0) {
delete iter;
return { cost, ret.GetCost() };
return { cost, ret.GetCost(), error_tile };
}
Command<CMD_TERRAFORM_LAND>::Do(flags, t, SLOPE_N, curh <= h);
} else {
@@ -413,5 +404,6 @@ std::tuple<CommandCost, Money> CmdLevelLand(DoCommandFlag flags, TileIndex tile,
}
delete iter;
return { had_success ? cost : last_error, 0 };
CommandCost cc_ret = had_success ? cost : last_error;
return { cc_ret, 0, cc_ret.Succeeded() ? tile : error_tile };
}