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Stratum ore: Allow use with no noise for simple horizontal strata

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If either of the 2 noise parameters are omitted the ore will occur from y_min
to y_max in a simple horizontal stratum. As this does not compute noise
performance improves, and is ideal for placing many layers.

Clean up some nearby ore documentation.
This commit is contained in:
paramat 2017-09-30 10:23:57 +01:00 • committed by paramat
parent 9fa78b7387
commit e2afcf85ce
4 changed files with 62 additions and 25 deletions
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32
src/mg_ore.cpp
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@ -433,14 +433,16 @@ void OreStratum::generate(MMVManip *vm, int mapseed, u32 blockseed,
PcgRandom pr(blockseed + 4234);
MapNode n_ore(c_ore, 0, ore_param2);
if (!noise) {
int sx = nmax.X - nmin.X + 1;
int sz = nmax.Z - nmin.Z + 1;
noise = new Noise(&np, 0, sx, sz);
noise_stratum_thickness = new Noise(&np_stratum_thickness, 0, sx, sz);
if (flags & OREFLAG_USE_NOISE) {
if (!(noise && noise_stratum_thickness)) {
int sx = nmax.X - nmin.X + 1;
int sz = nmax.Z - nmin.Z + 1;
noise = new Noise(&np, 0, sx, sz);
noise_stratum_thickness = new Noise(&np_stratum_thickness, 0, sx, sz);
}
noise->perlinMap2D(nmin.X, nmin.Z);
noise_stratum_thickness->perlinMap2D(nmin.X, nmin.Z);
}
noise->perlinMap2D(nmin.X, nmin.Z);
noise_stratum_thickness->perlinMap2D(nmin.X, nmin.Z);
size_t index = 0;
@ -452,10 +454,18 @@ void OreStratum::generate(MMVManip *vm, int mapseed, u32 blockseed,
continue;
}
float nmid = noise->result[index];
float nhalfthick = noise_stratum_thickness->result[index] / 2.0f;
int y0 = MYMAX(nmin.Y, nmid - nhalfthick);
int y1 = MYMIN(nmax.Y, nmid + nhalfthick);
int y0;
int y1;
if (flags & OREFLAG_USE_NOISE) {
float nmid = noise->result[index];
float nhalfthick = noise_stratum_thickness->result[index] / 2.0f;
y0 = MYMAX(nmin.Y, nmid - nhalfthick);
y1 = MYMIN(nmax.Y, nmid + nhalfthick);
} else {
y0 = nmin.Y;
y1 = nmax.Y;
}
for (int y = y0; y <= y1; y++) {
if (pr.range(1, clust_scarcity) != 1)