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Noise: Automatically transform noise maps if needed

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kwolekr
2014-12-10 23:35:37 -05:00
parent dcc48976ce
commit 16baed0467
6 changed files with 21 additions and 46 deletions
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23
src/noise.cpp
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@@ -611,6 +611,11 @@ float *Noise::perlinMap2D(float x, float y, float *persistence_map)
g *= np.persist;
}
if (fabs(np.offset - 0.f) > 0.00001 || fabs(np.scale - 1.f) > 0.00001) {
for (size_t i = 0; i != bufsize; i++)
result[i] = result[i] * np.scale + np.offset;
}
return result;
}
@@ -644,6 +649,11 @@ float *Noise::perlinMap3D(float x, float y, float z, float *persistence_map)
g *= np.persist;
}
if (fabs(np.offset - 0.f) > 0.00001 || fabs(np.scale - 1.f) > 0.00001) {
for (size_t i = 0; i != bufsize; i++)
result[i] = result[i] * np.scale + np.offset;
}
return result;
}
@@ -675,16 +685,3 @@ void Noise::updateResults(float g, float *gmap,
}
}
}
void Noise::transformNoiseMap()
{
// Because sx, sy, and sz are object members whose values may conceivably be
// modified in other threads. gcc (at least) will consider the buffer size
// computation as invalidated between loop comparisons, resulting in a ~2x
// slowdown even with -O2. To prevent this, store the value in a local.
size_t bufsize = sx * sy * sz;
for (size_t i = 0; i != bufsize; i++)
result[i] = result[i] * np.scale + np.offset;
}