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/*
Minetest
Copyright (C) 2010-2013 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
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.
*/
#ifndef MG_BIOME_HEADER
#define MG_BIOME_HEADER
#include "objdef.h"
#include "nodedef.h"
#include "noise.h"
class Settings;
class BiomeManager;
////
//// Biome
////
typedef u8 biome_t;
#define BIOME_NONE ((biome_t)0)
// TODO(hmmmm): Decide whether this is obsolete or will be used in the future
enum BiomeType {
BIOMETYPE_NORMAL,
BIOMETYPE_LIQUID,
BIOMETYPE_NETHER,
BIOMETYPE_AETHER,
BIOMETYPE_FLAT,
};
class Biome : public ObjDef, public NodeResolver {
public:
u32 flags;
content_t c_top;
content_t c_filler;
content_t c_stone;
content_t c_water_top;
content_t c_water;
content_t c_river_water;
content_t c_dust;
s16 depth_top;
s16 depth_filler;
s16 depth_water_top;
s16 y_min;
s16 y_max;
float heat_point;
float humidity_point;
virtual void resolveNodeNames();
};
////
//// BiomeGen
////
enum BiomeGenType {
BIOMEGEN_ORIGINAL,
};
struct BiomeParams {
virtual void readParams(const Settings *settings) = 0;
virtual void writeParams(Settings *settings) const = 0;
virtual ~BiomeParams() {}
s32 seed;
};
class BiomeGen {
public:
virtual ~BiomeGen() {}
virtual BiomeGenType getType() const = 0;
// Calculates the biome at the exact position provided. This function can
// be called at any time, but may be less efficient than the latter methods,
// depending on implementation.
virtual Biome *calcBiomeAtPoint(v3s16 pos) const = 0;
// Computes any intermediate results needed for biome generation. Must be
// called before using any of: getBiomes, getBiomeAtPoint, or getBiomeAtIndex.
// Calling this invalidates the previous results stored in biomemap.
virtual void calcBiomeNoise(v3s16 pmin) = 0;
// Gets all biomes in current chunk using each corresponding element of
// heightmap as the y position, then stores the results by biome index in
// biomemap (also returned)
virtual biome_t *getBiomes(s16 *heightmap) = 0;
// Gets a single biome at the specified position, which must be contained
// in the region formed by m_pmin and (m_pmin + m_csize - 1).
virtual Biome *getBiomeAtPoint(v3s16 pos) const = 0;
// Same as above, but uses a raw numeric index correlating to the (x,z) position.
virtual Biome *getBiomeAtIndex(size_t index, s16 y) const = 0;
// Result of calcBiomes bulk computation.
biome_t *biomemap;
protected:
BiomeManager *m_bmgr;
v3s16 m_pmin;
v3s16 m_csize;
};
////
//// BiomeGen implementations
////
//
// Original biome algorithm (Whittaker's classification + surface height)
//
struct BiomeParamsOriginal : public BiomeParams {
BiomeParamsOriginal() :
np_heat(50, 50, v3f(750.0, 750.0, 750.0), 5349, 3, 0.5, 2.0),
np_humidity(50, 50, v3f(750.0, 750.0, 750.0), 842, 3, 0.5, 2.0),
np_heat_blend(0, 1.5, v3f(8.0, 8.0, 8.0), 13, 2, 1.0, 2.0),
np_humidity_blend(0, 1.5, v3f(8.0, 8.0, 8.0), 90003, 2, 1.0, 2.0)
{
}
virtual void readParams(const Settings *settings);
virtual void writeParams(Settings *settings) const;
NoiseParams np_heat;
NoiseParams np_humidity;
NoiseParams np_heat_blend;
NoiseParams np_humidity_blend;
};
class BiomeGenOriginal : public BiomeGen {
public:
BiomeGenOriginal(BiomeManager *biomemgr,
BiomeParamsOriginal *params, v3s16 chunksize);
virtual ~BiomeGenOriginal();
BiomeGenType getType() const { return BIOMEGEN_ORIGINAL; }
Biome *calcBiomeAtPoint(v3s16 pos) const;
void calcBiomeNoise(v3s16 pmin);
biome_t *getBiomes(s16 *heightmap);
Biome *getBiomeAtPoint(v3s16 pos) const;
Biome *getBiomeAtIndex(size_t index, s16 y) const;
Biome *calcBiomeFromNoise(float heat, float humidity, s16 y) const;
float *heatmap;
float *humidmap;
private:
BiomeParamsOriginal *m_params;
Noise *noise_heat;
Noise *noise_humidity;
Noise *noise_heat_blend;
Noise *noise_humidity_blend;
};
////
//// BiomeManager
////
class BiomeManager : public ObjDefManager {
public:
BiomeManager(IGameDef *gamedef);
virtual ~BiomeManager();
const char *getObjectTitle() const
{
return "biome";
}
static Biome *create(BiomeType type)
{
return new Biome;
}
BiomeGen *createBiomeGen(BiomeGenType type, BiomeParams *params, v3s16 chunksize)
{
switch (type) {
case BIOMEGEN_ORIGINAL:
return new BiomeGenOriginal(this,
(BiomeParamsOriginal *)params, chunksize);
default:
return NULL;
}
}
static BiomeParams *createBiomeParams(BiomeGenType type)
{
switch (type) {
case BIOMEGEN_ORIGINAL:
return new BiomeParamsOriginal;
default:
return NULL;
}
}
virtual void clear();
private:
IGameDef *m_gamedef;
};
#endif
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