minetest/src/scriptapi_noise.cpp

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/*
Minetest
Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
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
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "scriptapi.h"
#include "scriptapi_noise.h"
#include "scriptapi_types.h"
#include "script.h"
// garbage collector
int LuaPerlinNoise::gc_object(lua_State *L)
{
LuaPerlinNoise *o = *(LuaPerlinNoise **)(lua_touserdata(L, 1));
delete o;
return 0;
}
int LuaPerlinNoise::l_get2d(lua_State *L)
{
LuaPerlinNoise *o = checkobject(L, 1);
v2f pos2d = read_v2f(L,2);
lua_Number val = noise2d_perlin(pos2d.X/o->scale, pos2d.Y/o->scale, o->seed, o->octaves, o->persistence);
lua_pushnumber(L, val);
return 1;
}
int LuaPerlinNoise::l_get3d(lua_State *L)
{
LuaPerlinNoise *o = checkobject(L, 1);
v3f pos3d = read_v3f(L,2);
lua_Number val = noise3d_perlin(pos3d.X/o->scale, pos3d.Y/o->scale, pos3d.Z/o->scale, o->seed, o->octaves, o->persistence);
lua_pushnumber(L, val);
return 1;
}
LuaPerlinNoise::LuaPerlinNoise(int a_seed, int a_octaves, float a_persistence,
float a_scale):
seed(a_seed),
octaves(a_octaves),
persistence(a_persistence),
scale(a_scale)
{
}
LuaPerlinNoise::~LuaPerlinNoise()
{
}
// LuaPerlinNoise(seed, octaves, persistence, scale)
// Creates an LuaPerlinNoise and leaves it on top of stack
int LuaPerlinNoise::create_object(lua_State *L)
{
int seed = luaL_checkint(L, 1);
int octaves = luaL_checkint(L, 2);
float persistence = luaL_checknumber(L, 3);
float scale = luaL_checknumber(L, 4);
LuaPerlinNoise *o = new LuaPerlinNoise(seed, octaves, persistence, scale);
*(void **)(lua_newuserdata(L, sizeof(void *))) = o;
luaL_getmetatable(L, className);
lua_setmetatable(L, -2);
return 1;
}
LuaPerlinNoise* LuaPerlinNoise::checkobject(lua_State *L, int narg)
{
luaL_checktype(L, narg, LUA_TUSERDATA);
void *ud = luaL_checkudata(L, narg, className);
if(!ud) luaL_typerror(L, narg, className);
return *(LuaPerlinNoise**)ud; // unbox pointer
}
void LuaPerlinNoise::Register(lua_State *L)
{
lua_newtable(L);
int methodtable = lua_gettop(L);
luaL_newmetatable(L, className);
int metatable = lua_gettop(L);
lua_pushliteral(L, "__metatable");
lua_pushvalue(L, methodtable);
lua_settable(L, metatable); // hide metatable from Lua getmetatable()
lua_pushliteral(L, "__index");
lua_pushvalue(L, methodtable);
lua_settable(L, metatable);
lua_pushliteral(L, "__gc");
lua_pushcfunction(L, gc_object);
lua_settable(L, metatable);
lua_pop(L, 1); // drop metatable
luaL_openlib(L, 0, methods, 0); // fill methodtable
lua_pop(L, 1); // drop methodtable
// Can be created from Lua (PerlinNoise(seed, octaves, persistence)
lua_register(L, className, create_object);
}
const char LuaPerlinNoise::className[] = "PerlinNoise";
const luaL_reg LuaPerlinNoise::methods[] = {
luamethod(LuaPerlinNoise, get2d),
luamethod(LuaPerlinNoise, get3d),
{0,0}
};
/*
PerlinNoiseMap
*/
int LuaPerlinNoiseMap::gc_object(lua_State *L)
{
LuaPerlinNoiseMap *o = *(LuaPerlinNoiseMap **)(lua_touserdata(L, 1));
delete o;
return 0;
}
int LuaPerlinNoiseMap::l_get2dMap(lua_State *L)
{
int i = 0;
LuaPerlinNoiseMap *o = checkobject(L, 1);
v2f p = read_v2f(L, 2);
Noise *n = o->noise;
n->perlinMap2D(p.X, p.Y);
lua_newtable(L);
for (int y = 0; y != n->sy; y++) {
lua_newtable(L);
for (int x = 0; x != n->sx; x++) {
float noiseval = n->np->offset + n->np->scale * n->result[i++];
lua_pushnumber(L, noiseval);
lua_rawseti(L, -2, x + 1);
}
lua_rawseti(L, -2, y + 1);
}
return 1;
}
int LuaPerlinNoiseMap::l_get3dMap(lua_State *L)
{
int i = 0;
LuaPerlinNoiseMap *o = checkobject(L, 1);
v3f p = read_v3f(L, 2);
Noise *n = o->noise;
n->perlinMap3D(p.X, p.Y, p.Z);
lua_newtable(L);
for (int z = 0; z != n->sz; z++) {
lua_newtable(L);
for (int y = 0; y != n->sy; y++) {
lua_newtable(L);
for (int x = 0; x != n->sx; x++) {
lua_pushnumber(L, n->np->offset + n->np->scale * n->result[i++]);
lua_rawseti(L, -2, x + 1);
}
lua_rawseti(L, -2, y + 1);
}
lua_rawseti(L, -2, z + 1);
}
return 1;
}
LuaPerlinNoiseMap::LuaPerlinNoiseMap(NoiseParams *np, int seed, v3s16 size) {
noise = new Noise(np, seed, size.X, size.Y, size.Z);
}
LuaPerlinNoiseMap::~LuaPerlinNoiseMap()
{
delete noise->np;
delete noise;
}
// LuaPerlinNoiseMap(np, size)
// Creates an LuaPerlinNoiseMap and leaves it on top of stack
int LuaPerlinNoiseMap::create_object(lua_State *L)
{
NoiseParams *np = read_noiseparams(L, 1);
if (!np)
return 0;
v3s16 size = read_v3s16(L, 2);
LuaPerlinNoiseMap *o = new LuaPerlinNoiseMap(np, 0, size);
*(void **)(lua_newuserdata(L, sizeof(void *))) = o;
luaL_getmetatable(L, className);
lua_setmetatable(L, -2);
return 1;
}
LuaPerlinNoiseMap* LuaPerlinNoiseMap::checkobject(lua_State *L, int narg)
{
luaL_checktype(L, narg, LUA_TUSERDATA);
void *ud = luaL_checkudata(L, narg, className);
if (!ud)
luaL_typerror(L, narg, className);
return *(LuaPerlinNoiseMap **)ud; // unbox pointer
}
void LuaPerlinNoiseMap::Register(lua_State *L)
{
lua_newtable(L);
int methodtable = lua_gettop(L);
luaL_newmetatable(L, className);
int metatable = lua_gettop(L);
lua_pushliteral(L, "__metatable");
lua_pushvalue(L, methodtable);
lua_settable(L, metatable); // hide metatable from Lua getmetatable()
lua_pushliteral(L, "__index");
lua_pushvalue(L, methodtable);
lua_settable(L, metatable);
lua_pushliteral(L, "__gc");
lua_pushcfunction(L, gc_object);
lua_settable(L, metatable);
lua_pop(L, 1); // drop metatable
luaL_openlib(L, 0, methods, 0); // fill methodtable
lua_pop(L, 1); // drop methodtable
// Can be created from Lua (PerlinNoiseMap(np, size)
lua_register(L, className, create_object);
}
const char LuaPerlinNoiseMap::className[] = "PerlinNoiseMap";
const luaL_reg LuaPerlinNoiseMap::methods[] = {
luamethod(LuaPerlinNoiseMap, get2dMap),
luamethod(LuaPerlinNoiseMap, get3dMap),
{0,0}
};
/*
NoiseParams
*/
NoiseParams *read_noiseparams(lua_State *L, int index)
{
if (index < 0)
index = lua_gettop(L) + 1 + index;
if (!lua_istable(L, index))
return NULL;
NoiseParams *np = new NoiseParams;
np->offset = getfloatfield_default(L, index, "offset", 0.0);
np->scale = getfloatfield_default(L, index, "scale", 0.0);
lua_getfield(L, index, "spread");
np->spread = read_v3f(L, -1);
np->seed = getintfield_default(L, index, "seed", 0);
np->octaves = getintfield_default(L, index, "octaves", 0);
np->persist = getfloatfield_default(L, index, "persist", 0.0);
return np;
}
/*
LuaPseudoRandom
*/
// garbage collector
int LuaPseudoRandom::gc_object(lua_State *L)
{
LuaPseudoRandom *o = *(LuaPseudoRandom **)(lua_touserdata(L, 1));
delete o;
return 0;
}
// next(self, min=0, max=32767) -> get next value
int LuaPseudoRandom::l_next(lua_State *L)
{
LuaPseudoRandom *o = checkobject(L, 1);
int min = 0;
int max = 32767;
lua_settop(L, 3); // Fill 2 and 3 with nil if they don't exist
if(!lua_isnil(L, 2))
min = luaL_checkinteger(L, 2);
if(!lua_isnil(L, 3))
max = luaL_checkinteger(L, 3);
if(max < min){
errorstream<<"PseudoRandom.next(): max="<<max<<" min="<<min<<std::endl;
throw LuaError(L, "PseudoRandom.next(): max < min");
}
if(max - min != 32767 && max - min > 32767/5)
throw LuaError(L, "PseudoRandom.next() max-min is not 32767 and is > 32768/5. This is disallowed due to the bad random distribution the implementation would otherwise make.");
PseudoRandom &pseudo = o->m_pseudo;
int val = pseudo.next();
val = (val % (max-min+1)) + min;
lua_pushinteger(L, val);
return 1;
}
LuaPseudoRandom::LuaPseudoRandom(int seed):
m_pseudo(seed)
{
}
LuaPseudoRandom::~LuaPseudoRandom()
{
}
const PseudoRandom& LuaPseudoRandom::getItem() const
{
return m_pseudo;
}
PseudoRandom& LuaPseudoRandom::getItem()
{
return m_pseudo;
}
// LuaPseudoRandom(seed)
// Creates an LuaPseudoRandom and leaves it on top of stack
int LuaPseudoRandom::create_object(lua_State *L)
{
int seed = luaL_checknumber(L, 1);
LuaPseudoRandom *o = new LuaPseudoRandom(seed);
*(void **)(lua_newuserdata(L, sizeof(void *))) = o;
luaL_getmetatable(L, className);
lua_setmetatable(L, -2);
return 1;
}
LuaPseudoRandom* LuaPseudoRandom::checkobject(lua_State *L, int narg)
{
luaL_checktype(L, narg, LUA_TUSERDATA);
void *ud = luaL_checkudata(L, narg, className);
if(!ud) luaL_typerror(L, narg, className);
return *(LuaPseudoRandom**)ud; // unbox pointer
}
void LuaPseudoRandom::Register(lua_State *L)
{
lua_newtable(L);
int methodtable = lua_gettop(L);
luaL_newmetatable(L, className);
int metatable = lua_gettop(L);
lua_pushliteral(L, "__metatable");
lua_pushvalue(L, methodtable);
lua_settable(L, metatable); // hide metatable from Lua getmetatable()
lua_pushliteral(L, "__index");
lua_pushvalue(L, methodtable);
lua_settable(L, metatable);
lua_pushliteral(L, "__gc");
lua_pushcfunction(L, gc_object);
lua_settable(L, metatable);
lua_pop(L, 1); // drop metatable
luaL_openlib(L, 0, methods, 0); // fill methodtable
lua_pop(L, 1); // drop methodtable
// Can be created from Lua (LuaPseudoRandom(seed))
lua_register(L, className, create_object);
}
const char LuaPseudoRandom::className[] = "PseudoRandom";
const luaL_reg LuaPseudoRandom::methods[] = {
luamethod(LuaPseudoRandom, next),
{0,0}
};