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(svn r20667) -Codechange: implement the autoslope callback for objects

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rubidium 2010-08-28 19:00:21 +00:00
parent d4403cb649
commit 3e67b4fe5f
2 changed files with 22 additions and 2 deletions
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2
src/newgrf_callbacks.h
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@ -271,7 +271,7 @@ enum CallbackID {
CBID_OBJECT_FUND_MORE_TEXT = 0x15C, // 15 bit callback, not implemented
/** Called to determine if one can alter the ground below an object tile */
CBID_OBJECT_AUTOSLOPE = 0x15D, // 15 bit callback, not implemented
CBID_OBJECT_AUTOSLOPE = 0x15D, // 15 bit callback
};
/**

22
src/object_cmd.cpp
View File

@ -621,7 +621,27 @@ static CommandCost TerraformTile_Object(TileIndex tile, DoCommandFlag flags, uin
CommandCost ret = CheckTileOwnership(tile);
if (ret.Succeeded()) return CommandCost();
} else if (AutoslopeEnabled() && type != OBJECT_TRANSMITTER && type != OBJECT_LIGHTHOUSE) {
if (!IsSteepSlope(tileh_new) && (z_new + GetSlopeMaxZ(tileh_new) == GetTileMaxZ(tile))) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
/* Behaviour:
* - Both new and old slope must not be steep.
* - TileMaxZ must not be changed.
* - Allow autoslope by default.
* - Disallow autoslope if callback succeeds and returns non-zero.
*/
Slope tileh_old = GetTileSlope(tile, NULL);
/* TileMaxZ must not be changed. Slopes must not be steep. */
if (!IsSteepSlope(tileh_old) && !IsSteepSlope(tileh_new) && (GetTileMaxZ(tile) == z_new + GetSlopeMaxZ(tileh_new))) {
const ObjectSpec *spec = ObjectSpec::Get(type);
/* Call callback 'disable autosloping for objects'. */
if (HasBit(spec->callback_mask, CBM_OBJ_AUTOSLOPE)) {
/* If the callback fails, allow autoslope. */
uint16 res = GetObjectCallback(CBID_OBJECT_AUTOSLOPE, 0, 0, spec, Object::GetByTile(tile), tile);
if ((res == 0) || (res == CALLBACK_FAILED)) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
} else if (spec->enabled) {
/* allow autoslope */
return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
}
}
}
return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);