Add MapSettingsManager and new mapgen setting script API functions

This commit refactors the majority of the Mapgen settings system.
- MapgenParams is now owned by MapSettingsManager, itself a part of ServerMap,
  instead of the EmergeManager.
- New Script API functions added:
    core.get_mapgen_setting
    core.get_mapgen_setting_noiseparams,
    core.set_mapgen_setting, and
    core.set_mapgen_setting_noiseparams.
- minetest.get/set_mapgen_params are deprecated by the above new functions.
- It is now possible to view and modify any arbitrary mapgen setting from a mod,
  rather than the base MapgenParams structure.
- MapgenSpecificParams has been removed.

1 files changed, 13 insertions, 15 deletions

diff --git a/src/mapgen_flat.cpp b/src/mapgen_flat.cpp
index 956af999a..2c1715e61 100644
--- a/src/mapgen_flat.cpp
+++ b/src/mapgen_flat.cpp
@@ -49,26 +49,24 @@ FlagDesc flagdesc_mapgen_flat[] = {
 ///////////////////////////////////////////////////////////////////////////////////////
 
 
-MapgenFlat::MapgenFlat(int mapgenid, MapgenParams *params, EmergeManager *emerge)
+MapgenFlat::MapgenFlat(int mapgenid, MapgenFlatParams *params, EmergeManager *emerge)
 	: MapgenBasic(mapgenid, params, emerge)
 {
-	MapgenFlatParams *sp = (MapgenFlatParams *)params->sparams;
-
-	this->spflags          = sp->spflags;
-	this->ground_level     = sp->ground_level;
-	this->large_cave_depth = sp->large_cave_depth;
-	this->cave_width       = sp->cave_width;
-	this->lake_threshold   = sp->lake_threshold;
-	this->lake_steepness   = sp->lake_steepness;
-	this->hill_threshold   = sp->hill_threshold;
-	this->hill_steepness   = sp->hill_steepness;
+	this->spflags          = params->spflags;
+	this->ground_level     = params->ground_level;
+	this->large_cave_depth = params->large_cave_depth;
+	this->cave_width       = params->cave_width;
+	this->lake_threshold   = params->lake_threshold;
+	this->lake_steepness   = params->lake_steepness;
+	this->hill_threshold   = params->hill_threshold;
+	this->hill_steepness   = params->hill_steepness;
 
 	//// 2D noise
-	noise_terrain      = new Noise(&sp->np_terrain,      seed, csize.X, csize.Z);
-	noise_filler_depth = new Noise(&sp->np_filler_depth, seed, csize.X, csize.Z);
+	noise_terrain      = new Noise(&params->np_terrain,      seed, csize.X, csize.Z);
+	noise_filler_depth = new Noise(&params->np_filler_depth, seed, csize.X, csize.Z);
 
-	MapgenBasic::np_cave1 = sp->np_cave1;
-	MapgenBasic::np_cave2 = sp->np_cave2;
+	MapgenBasic::np_cave1 = params->np_cave1;
+	MapgenBasic::np_cave2 = params->np_cave2;
 }