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Add API for mods to hook liquid transformation events (#11405)

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Add API for mods to hook liquid transformation events

Without this API, there is no reliable way for mods to be
notified when liquid transform modifies nodes and mods are
forced to poll for changes.  This allows mods to detect
changes to flowing liquid nodes and liquid renewal using
event-driven logic.
This commit is contained in:
Warr1024
2021-07-09 09:08:40 -04:00
committed by GitHub
parent e9bc59e376
commit 52128ae11e
5 changed files with 47 additions and 1 deletions
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34
src/script/cpp_api/s_env.cpp
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@@ -25,6 +25,8 @@ with this program; if not, write to the Free Software Foundation, Inc.,
#include "mapgen/mapgen.h"
#include "lua_api/l_env.h"
#include "server.h"
#include "script/common/c_content.h"
void ScriptApiEnv::environment_OnGenerated(v3s16 minp, v3s16 maxp,
u32 blockseed)
@@ -267,3 +269,35 @@ void ScriptApiEnv::on_emerge_area_completion(
luaL_unref(L, LUA_REGISTRYINDEX, state->args_ref);
}
}
void ScriptApiEnv::on_liquid_transformed(
const std::vector<std::pair<v3s16, MapNode>> &list)
{
SCRIPTAPI_PRECHECKHEADER
// Get core.registered_on_liquid_transformed
lua_getglobal(L, "core");
lua_getfield(L, -1, "registered_on_liquid_transformed");
luaL_checktype(L, -1, LUA_TTABLE);
lua_remove(L, -2);
// Skip converting list and calling hook if there are
// no registered callbacks.
if(lua_objlen(L, -1) < 1) return;
// Convert the list to a pos array and a node array for lua
int index = 1;
const NodeDefManager *ndef = getEnv()->getGameDef()->ndef();
lua_createtable(L, list.size(), 0);
lua_createtable(L, list.size(), 0);
for(std::pair<v3s16, MapNode> p : list) {
lua_pushnumber(L, index);
push_v3s16(L, p.first);
lua_rawset(L, -4);
lua_pushnumber(L, index++);
pushnode(L, p.second, ndef);
lua_rawset(L, -3);
}
runCallbacks(2, RUN_CALLBACKS_MODE_FIRST);
}