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Cavegen/Mgv5/Mgv7: Add optional giant caverns

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Add to MapgenBasic for use by multiple mapgens.
Add to mgv5 and mgv7, enabled by default.

Similar to mgvalleys caverns but half the scale.
Parameters for upper y limit, distance caverns taper to full size, and
noise threshold (full cavern size).
As with mgvalleys caverns are generated first and classic caves are
disabled in any mapchunk containing a cavern, to avoid excessive
spreading volumes of liquids.
This also avoids floating blobs of liquid where a large classic cave
has overgenerated out into a neighbouring previously-generated mapchunk.
This commit is contained in:
paramat 2017-03-12 13:26:09 +00:00
parent 86b1542181
commit 859141a0ce
10 changed files with 303 additions and 54 deletions
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30
src/cavegen.h
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@ -62,6 +62,36 @@ private:
Noise *noise_cave2;
};
/*
CavernsNoise is a cave digging algorithm
*/
class CavernsNoise {
public:
CavernsNoise(INodeDefManager *nodedef, v3s16 chunksize, NoiseParams *np_cavern,
s32 seed, float cavern_limit, float cavern_taper, float cavern_threshold);
~CavernsNoise();
bool generateCaverns(MMVManip *vm, v3s16 nmin, v3s16 nmax);
private:
INodeDefManager *m_ndef;
// configurable parameters
v3s16 m_csize;
float m_cavern_limit;
float m_cavern_taper;
float m_cavern_threshold;
// intermediate state variables
u16 m_ystride;
u16 m_zstride_1d;
Noise *noise_cavern;
content_t c_water_source;
content_t c_lava_source;
};
/*
CavesRandomWalk is an implementation of a cave-digging algorithm that
operates on the principle of a "random walk" to approximate the stochiastic