Move biome calculation to BiomeGen

BiomeGen defines an interface that, given a set of BiomeParams, computes biomes
for a given area using the algorithm implemented by that specific BiomeGen.
This abstracts away the old system where each mapgen supplied the noises
required for biome generation.

1 files changed, 10 insertions, 6 deletions

diff --git a/src/script/lua_api/l_mapgen.cpp b/src/script/lua_api/l_mapgen.cpp
index fb839176b..405b93b86 100644
--- a/src/script/lua_api/l_mapgen.cpp
+++ b/src/script/lua_api/l_mapgen.cpp
@@ -528,24 +528,26 @@ int ModApiMapgen::l_get_mapgen_object(lua_State *L)
 		return 1;
 	}
 	case MGOBJ_BIOMEMAP: {
-		if (!mg->biomemap)
+		if (!mg->biomegen)
 			return 0;
 
 		lua_newtable(L);
 		for (size_t i = 0; i != maplen; i++) {
-			lua_pushinteger(L, mg->biomemap[i]);
+			lua_pushinteger(L, mg->biomegen->biomemap[i]);
 			lua_rawseti(L, -2, i + 1);
 		}
 
 		return 1;
 	}
 	case MGOBJ_HEATMAP: {
-		if (!mg->heatmap)
+		if (!mg->biomegen || mg->biomegen->getType() != BIOMEGEN_ORIGINAL)
 			return 0;
 
+		BiomeGenOriginal *bg = (BiomeGenOriginal *)mg->biomegen;
+
 		lua_newtable(L);
 		for (size_t i = 0; i != maplen; i++) {
-			lua_pushnumber(L, mg->heatmap[i]);
+			lua_pushnumber(L, bg->heatmap[i]);
 			lua_rawseti(L, -2, i + 1);
 		}
 
@@ -553,12 +555,14 @@ int ModApiMapgen::l_get_mapgen_object(lua_State *L)
 	}
 
 	case MGOBJ_HUMIDMAP: {
-		if (!mg->humidmap)
+		if (!mg->biomegen || mg->biomegen->getType() != BIOMEGEN_ORIGINAL)
 			return 0;
 
+		BiomeGenOriginal *bg = (BiomeGenOriginal *)mg->biomegen;
+
 		lua_newtable(L);
 		for (size_t i = 0; i != maplen; i++) {
-			lua_pushnumber(L, mg->humidmap[i]);
+			lua_pushnumber(L, bg->humidmap[i]);
 			lua_rawseti(L, -2, i + 1);
 		}