Add Lua on_mapgen_init callback, and minetest.set_mapgen_params API

src/script/cpp_api/s_env.cpp

@@ -21,6 +21,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "common/c_converter.h"
 #include "log.h"
 #include "environment.h"
+#include "mapgen.h"
 #include "lua_api/l_env.h"
 
 extern "C" {
@@ -55,6 +56,33 @@ void ScriptApiEnv::environment_Step(float dtime)
 	runCallbacks(1, RUN_CALLBACKS_MODE_FIRST);
 }
 
+void ScriptApiEnv::environment_OnMapgenInit(MapgenParams *mgparams)
+{
+	SCRIPTAPI_PRECHECKHEADER
+	
+	// Get minetest.registered_on_mapgen_inits
+	lua_getglobal(L, "minetest");
+	lua_getfield(L, -1, "registered_on_mapgen_inits");
+
+	// Call callbacks
+	lua_newtable(L);
+	
+	lua_pushstring(L, mgparams->mg_name.c_str());
+	lua_setfield(L, -2, "mgname");
+	
+	lua_pushinteger(L, mgparams->seed);
+	lua_setfield(L, -2, "seed");
+	
+	lua_pushinteger(L, mgparams->water_level);
+	lua_setfield(L, -2, "water_level");
+	
+	std::string flagstr = writeFlagString(mgparams->flags, flagdesc_mapgen);
+	lua_pushstring(L, flagstr.c_str());
+	lua_setfield(L, -2, "flags");
+	
+	runCallbacks(1, RUN_CALLBACKS_MODE_FIRST);
+}
+
 void ScriptApiEnv::initializeEnvironment(ServerEnvironment *env)
 {
 	SCRIPTAPI_PRECHECKHEADER

src/script/cpp_api/s_env.h

@@ -24,6 +24,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "irr_v3d.h"
 
 class ServerEnvironment;
+struct MapgenParams;
 
 class ScriptApiEnv
 		: virtual public ScriptApiBase
@@ -33,6 +34,8 @@ public:
 	void environment_Step(float dtime);
 	// After generating a piece of map
 	void environment_OnGenerated(v3s16 minp, v3s16 maxp,u32 blockseed);
+	// After initializing mapgens
+	void environment_OnMapgenInit(MapgenParams *mgparams);
 
 	void initializeEnvironment(ServerEnvironment *env);
 };

src/script/lua_api/l_env.cpp

@@ -652,6 +652,59 @@ int ModApiEnvMod::l_get_mapgen_object(lua_State *L)
 	return nargs;
 }
 
+// minetest.set_mapgen_params(params)
+// set mapgen parameters
+int ModApiEnvMod::l_set_mapgen_params(lua_State *L)
+{
+	if (!lua_istable(L, 1))
+		return 0;
+
+	EmergeManager *emerge = getServer(L)->getEmergeManager();
+	if (emerge->mapgen.size())
+		return 0;
+	
+	MapgenParams *oparams = new MapgenParams;
+	u32 paramsmodified = 0;
+	u32 flagmask = 0;
+	
+	lua_getfield(L, 1, "mgname");
+	if (lua_isstring(L, -1)) {
+		oparams->mg_name = std::string(lua_tostring(L, -1));
+		paramsmodified |= MGPARAMS_SET_MGNAME;
+	}
+	
+	lua_getfield(L, 1, "seed");
+	if (lua_isnumber(L, -1)) {
+		oparams->seed = lua_tointeger(L, -1);
+		paramsmodified |= MGPARAMS_SET_SEED;
+	}
+	
+	lua_getfield(L, 1, "water_level");
+	if (lua_isnumber(L, -1)) {
+		oparams->water_level = lua_tointeger(L, -1);
+		paramsmodified |= MGPARAMS_SET_WATER_LEVEL;
+	}
+
+	lua_getfield(L, 1, "flags");
+	if (lua_isstring(L, -1)) {
+		std::string flagstr = std::string(lua_tostring(L, -1));
+		oparams->flags = readFlagString(flagstr, flagdesc_mapgen);
+		paramsmodified |= MGPARAMS_SET_FLAGS;
+	
+		lua_getfield(L, 1, "flagmask");
+		if (lua_isstring(L, -1)) {
+			flagstr = std::string(lua_tostring(L, -1));
+			flagmask = readFlagString(flagstr, flagdesc_mapgen);
+		}
+	}
+	
+	emerge->luaoverride_params          = oparams;
+	emerge->luaoverride_params_modified = paramsmodified;
+	emerge->luaoverride_flagmask        = flagmask;
+	
+	return 0;
+}
+
 // minetest.clear_objects()
 // clear all objects in the environment
 int ModApiEnvMod::l_clear_objects(lua_State *L)
@@ -799,6 +852,7 @@ bool ModApiEnvMod::Initialize(lua_State *L,int top)
 	retval &= API_FCT(get_perlin_map);
 	retval &= API_FCT(get_voxel_manip);
 	retval &= API_FCT(get_mapgen_object);
+	retval &= API_FCT(set_mapgen_params);
 	retval &= API_FCT(clear_objects);
 	retval &= API_FCT(spawn_tree);
 	retval &= API_FCT(find_path);

src/script/lua_api/l_env.h

@@ -117,6 +117,10 @@ private:
 	// minetest.get_mapgen_object(objectname)
 	// returns the requested object used during map generation
 	static int l_get_mapgen_object(lua_State *L);
+	
+	// minetest.set_mapgen_params(params)
+	// set mapgen parameters
+	static int l_set_mapgen_params(lua_State *L);
 
 	// minetest.clear_objects()
 	// clear all objects in the environment