Mapgen: Various fixes and improvements

Lua_api.txt: Document 'minetest.registered_biomes'
Minimal: Remove 'mapgen_air' alias
Cavegen: Add fallback node for 'mapgen_ice'
Dungeongen: Add fallback node for 'mapgen_river_water_source'
Mgv5: Remove unnecessary '#include util/directiontables.h'
Add missing 'this->'s in makeChunk()
Mgv6: Edit empty line formatting
Remove leading spaces in makeChunk()
Add missing spaces after 'for' and 'if'
Mgv7: Edit empty line formatting

doc/lua_api.txt

@@ -2461,6 +2461,8 @@ These functions return the leftover itemstack.
     * Map of Lua entities, indexed by active object id
 * `minetest.registered_ores`
     * List of registered ore definitions.
+* `minetest.registered_biomes`
+    * List of registered biome definitions.
 * `minetest.registered_decorations`
     * List of registered decoration definitions.
 

games/minimal/mods/default/mapgen.lua

@@ -3,7 +3,6 @@
 --
 
 
-minetest.register_alias("mapgen_air", "air")
 minetest.register_alias("mapgen_stone", "default:stone")
 minetest.register_alias("mapgen_dirt", "default:dirt")
 minetest.register_alias("mapgen_dirt_with_grass", "default:dirt_with_grass")

src/cavegen.cpp

@@ -44,6 +44,9 @@ CaveV5::CaveV5(Mapgen *mg, PseudoRandom *ps)
 	this->np_caveliquids = &nparams_caveliquids;
 	this->ystride        = mg->csize.X;
  
+	if (c_ice == CONTENT_IGNORE)
+		c_ice = CONTENT_AIR;
+
 	dswitchint = ps->range(1, 14);
 	flooded    = ps->range(1, 2) == 2;
 

src/dungeongen.cpp

@@ -68,6 +68,8 @@ DungeonGen::DungeonGen(Mapgen *mapgen, DungeonParams *dparams)
 
 	// For mapgens using river water
 	dp.c_river_water = mg->ndef->getId("mapgen_river_water_source");
+	if (dp.c_river_water == CONTENT_IGNORE)
+		dp.c_river_water = mg->ndef->getId("mapgen_water_source");
 }
 
 

src/mapgen_v5.cpp

@@ -38,7 +38,6 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "mg_ore.h"
 #include "mg_decoration.h"
 #include "mapgen_v5.h"
-#include "util/directiontables.h"
 
 
 FlagDesc flagdesc_mapgen_v5[] = {
@@ -216,9 +215,9 @@ void MapgenV5::makeChunk(BlockMakeData *data)
 		data->blockpos_requested.Y <= data->blockpos_max.Y &&
 		data->blockpos_requested.Z <= data->blockpos_max.Z);
 
-	generating = true;
+	this->generating = true;
-	vm   = data->vmanip;
+	this->vm   = data->vmanip;
-	ndef = data->nodedef;
+	this->ndef = data->nodedef;
 	//TimeTaker t("makeChunk");
 
 	v3s16 blockpos_min = data->blockpos_min;

src/mapgen_v6.cpp

@@ -17,6 +17,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
+
 #include "mapgen.h"
 #include "voxel.h"
 #include "noise.h"
@@ -37,6 +38,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "mg_decoration.h"
 #include "mapgen_v6.h"
 
+
 FlagDesc flagdesc_mapgen_v6[] = {
 	{"jungles",    MGV6_JUNGLES},
 	{"biomeblend", MGV6_BIOMEBLEND},
@@ -47,7 +49,8 @@ FlagDesc flagdesc_mapgen_v6[] = {
 	{NULL,         0}
 };
 
-///////////////////////////////////////////////////////////////////////////////
+
+/////////////////////////////////////////////////////////////////////////////
 
 
 MapgenV6::MapgenV6(int mapgenid, MapgenParams *params, EmergeManager *emerge)
@@ -197,7 +200,6 @@ void MapgenV6Params::writeParams(Settings *settings) const
 
 //////////////////////// Some helper functions for the map generator
 
-
 // Returns Y one under area minimum if not found
 s16 MapgenV6::find_stone_level(v2s16 p2d)
 {

src/mapgen_v7.cpp

@@ -46,6 +46,7 @@ FlagDesc flagdesc_mapgen_v7[] = {
 	{NULL,        0}
 };
 
+
 ///////////////////////////////////////////////////////////////////////////////