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, 16 insertions, 18 deletions

diff --git a/src/mapgen_fractal.cpp b/src/mapgen_fractal.cpp
index 9e4c210dc..0951a0afa 100644
--- a/src/mapgen_fractal.cpp
+++ b/src/mapgen_fractal.cpp
@@ -47,29 +47,27 @@ FlagDesc flagdesc_mapgen_fractal[] = {
 ///////////////////////////////////////////////////////////////////////////////////////
 
 
-MapgenFractal::MapgenFractal(int mapgenid, MapgenParams *params, EmergeManager *emerge)
+MapgenFractal::MapgenFractal(int mapgenid, MapgenFractalParams *params, EmergeManager *emerge)
 	: MapgenBasic(mapgenid, params, emerge)
 {
-	MapgenFractalParams *sp = (MapgenFractalParams *)params->sparams;
-
-	this->spflags    = sp->spflags;
-	this->cave_width = sp->cave_width;
-	this->fractal    = sp->fractal;
-	this->iterations = sp->iterations;
-	this->scale      = sp->scale;
-	this->offset     = sp->offset;
-	this->slice_w    = sp->slice_w;
-	this->julia_x    = sp->julia_x;
-	this->julia_y    = sp->julia_y;
-	this->julia_z    = sp->julia_z;
-	this->julia_w    = sp->julia_w;
+	this->spflags    = params->spflags;
+	this->cave_width = params->cave_width;
+	this->fractal    = params->fractal;
+	this->iterations = params->iterations;
+	this->scale      = params->scale;
+	this->offset     = params->offset;
+	this->slice_w    = params->slice_w;
+	this->julia_x    = params->julia_x;
+	this->julia_y    = params->julia_y;
+	this->julia_z    = params->julia_z;
+	this->julia_w    = params->julia_w;
 
 	//// 2D terrain noise
-	noise_seabed       = new Noise(&sp->np_seabed, seed, csize.X, csize.Z);
-	noise_filler_depth = new Noise(&sp->np_filler_depth, seed, csize.X, csize.Z);
+	noise_seabed       = new Noise(&params->np_seabed, 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;
 
 	this->formula = fractal / 2 + fractal % 2;
 	this->julia   = fractal % 2 == 0;