Mapgen Flat: Add caverns, disabled by default (#9913)

Add the caverns used in V5, V7, Valleys, Carpathian.
Disabled by default to not be force-enabled in existing worlds.

1 files changed, 14 insertions, 8 deletions

diff --git a/src/mapgen/mapgen_flat.h b/src/mapgen/mapgen_flat.h
index 4902a802c..4b46aff27 100644
--- a/src/mapgen/mapgen_flat.h
+++ b/src/mapgen/mapgen_flat.h
@@ -1,7 +1,7 @@
 /*
 Minetest
-Copyright (C) 2015-2018 paramat
-Copyright (C) 2015-2018 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
+Copyright (C) 2015-2020 paramat
+Copyright (C) 2015-2016 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
 
 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU Lesser General Public License as published by
@@ -25,6 +25,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 /////// Mapgen Flat flags
 #define MGFLAT_LAKES 0x01
 #define MGFLAT_HILLS 0x02
+#define MGFLAT_CAVERNS 0x04
 
 class BiomeManager;
 
@@ -33,22 +34,27 @@ extern FlagDesc flagdesc_mapgen_flat[];
 struct MapgenFlatParams : public MapgenParams
 {
 	s16 ground_level = 8;
-	s16 large_cave_depth = -33;
+	float lake_threshold = -0.45f;
+	float lake_steepness = 48.0f;
+	float hill_threshold = 0.45f;
+	float hill_steepness = 64.0f;
+
+	float cave_width = 0.09f;
 	u16 small_cave_num_min = 0;
 	u16 small_cave_num_max = 0;
 	u16 large_cave_num_min = 0;
 	u16 large_cave_num_max = 2;
+	s16 large_cave_depth = -33;
 	float large_cave_flooded = 0.5f;
-	float cave_width = 0.09f;
-	float lake_threshold = -0.45f;
-	float lake_steepness = 48.0f;
-	float hill_threshold = 0.45f;
-	float hill_steepness = 64.0f;
+	s16 cavern_limit = -256;
+	s16 cavern_taper = 256;
+	float cavern_threshold = 0.7f;
 	s16 dungeon_ymin = -31000;
 	s16 dungeon_ymax = 31000;
 
 	NoiseParams np_terrain;
 	NoiseParams np_filler_depth;
+	NoiseParams np_cavern;
 	NoiseParams np_cave1;
 	NoiseParams np_cave2;
 	NoiseParams np_dungeons;