From 18882a4d2603488bdfb5a519a8bedf300b154940 Mon Sep 17 00:00:00 2001
From: kwolekr <kwolekr@minetest.net>
Date: Wed, 26 Jun 2013 21:04:06 -0400
Subject: [PATCH] Add Lua PerlinNoiseMap:get#dMap_flat API

---
 doc/lua_api.txt                |  9 +++++++
 src/script/lua_api/l_noise.cpp | 45 ++++++++++++++++++++++++++++++++++
 src/script/lua_api/l_noise.h   |  3 ++-
 3 files changed, 56 insertions(+), 1 deletion(-)

diff --git a/doc/lua_api.txt b/doc/lua_api.txt
index 84769f8d8..62abb2e3e 100644
--- a/doc/lua_api.txt
+++ b/doc/lua_api.txt
@@ -1529,6 +1529,15 @@ methods:
 - get2d(pos) -> 2d noise value at pos={x=,y=}
 - get3d(pos) -> 3d noise value at pos={x=,y=,z=}
 
+PerlinNoiseMap: A fast, bulk perlin noise generator
+- Can be created via PerlinNoiseMap(noiseparams, size)
+- Also minetest.get_perlin_map(noiseparams, size)
+methods:
+- get2dMap(pos) -> <size.x>X<size.y> 2d array of 2d noise values starting at pos={x=,y=}
+- get3dMap(pos) -> <size.x>X<size.y>X<size.z> 3d array of 3d noise values starting at pos={x=,y=,z=}
+- get2dMap_flat(pos) -> Flat <size.x * size.y> element array of 2d noise values starting at pos={x=,y=}
+- get3dMap_flat(pos) -> Same as get2dMap_flat, but 3d noise
+
 VoxelManip: An interface to the MapVoxelManipulator for Lua
 - Can be created via VoxelManip()
 - Also minetest.get_voxel_manip()
diff --git a/src/script/lua_api/l_noise.cpp b/src/script/lua_api/l_noise.cpp
index e0abeae94..43149e93c 100644
--- a/src/script/lua_api/l_noise.cpp
+++ b/src/script/lua_api/l_noise.cpp
@@ -159,6 +159,27 @@ int LuaPerlinNoiseMap::l_get2dMap(lua_State *L)
 	return 1;
 }
 
+int LuaPerlinNoiseMap::l_get2dMap_flat(lua_State *L)
+{
+	NO_MAP_LOCK_REQUIRED;
+
+	LuaPerlinNoiseMap *o = checkobject(L, 1);
+	v2f p = read_v2f(L, 2);
+
+	Noise *n = o->noise;
+	n->perlinMap2D(p.X, p.Y);
+
+	int maplen = n->sx * n->sy;
+	
+	lua_newtable(L);
+	for (int i = 0; i != maplen; i++) {
+		float noiseval = n->np->offset + n->np->scale * n->result[i];
+		lua_pushnumber(L, noiseval);
+		lua_rawseti(L, -2, i + 1);
+	}
+	return 1;
+}
+
 int LuaPerlinNoiseMap::l_get3dMap(lua_State *L)
 {
 	NO_MAP_LOCK_REQUIRED;
@@ -186,6 +207,28 @@ int LuaPerlinNoiseMap::l_get3dMap(lua_State *L)
 	return 1;
 }
 
+int LuaPerlinNoiseMap::l_get3dMap_flat(lua_State *L)
+{
+	NO_MAP_LOCK_REQUIRED;
+
+	LuaPerlinNoiseMap *o = checkobject(L, 1);
+	v3f p = read_v3f(L, 2);
+
+	Noise *n = o->noise;
+	n->perlinMap3D(p.X, p.Y, p.Z);
+
+
+	int maplen = n->sx * n->sy * n->sz;
+	
+	lua_newtable(L);
+	for (int i = 0; i != maplen; i++) {
+		float noiseval = n->np->offset + n->np->scale * n->result[i];
+		lua_pushnumber(L, noiseval);
+		lua_rawseti(L, -2, i + 1);
+	}
+	return 1;
+}
+
 LuaPerlinNoiseMap::LuaPerlinNoiseMap(NoiseParams *np, int seed, v3s16 size) {
 	noise = new Noise(np, seed, size.X, size.Y, size.Z);
 }
@@ -254,7 +297,9 @@ void LuaPerlinNoiseMap::Register(lua_State *L)
 const char LuaPerlinNoiseMap::className[] = "PerlinNoiseMap";
 const luaL_reg LuaPerlinNoiseMap::methods[] = {
 	luamethod(LuaPerlinNoiseMap, get2dMap),
+	luamethod(LuaPerlinNoiseMap, get2dMap_flat),
 	luamethod(LuaPerlinNoiseMap, get3dMap),
+	luamethod(LuaPerlinNoiseMap, get3dMap_flat),
 	{0,0}
 };
 
diff --git a/src/script/lua_api/l_noise.h b/src/script/lua_api/l_noise.h
index d0b51d756..6275ca472 100644
--- a/src/script/lua_api/l_noise.h
+++ b/src/script/lua_api/l_noise.h
@@ -74,8 +74,9 @@ private:
 	static int gc_object(lua_State *L);
 
 	static int l_get2dMap(lua_State *L);
-
+	static int l_get2dMap_flat(lua_State *L);
 	static int l_get3dMap(lua_State *L);
+	static int l_get3dMap_flat(lua_State *L);
 
 public:
 	LuaPerlinNoiseMap(NoiseParams *np, int seed, v3s16 size);