v1.4.4

source/game/terrain/StarPerlinSelector.cpp

@@ -0,0 +1,30 @@
+#include "StarPerlinSelector.hpp"
+#include "StarRandom.hpp"
+
+namespace Star {
+
+char const* const PerlinSelector::Name = "perlin";
+
+PerlinSelector::PerlinSelector(Json const& config, TerrainSelectorParameters const& parameters)
+  : TerrainSelector(Name, config, parameters) {
+  RandomSource random(parameters.seed);
+
+  auto type = PerlinTypeNames.getLeft(config.getString("function"));
+  auto octaves = config.getFloat("octaves");
+  auto freq = config.getFloat("freq");
+  auto amp = config.getFloat("amp");
+  auto bias = config.getFloat("bias", 0.0f);
+  auto alpha = config.getFloat("alpha", 2.0f);
+  auto beta = config.getFloat("beta", 2.0f);
+
+  function = PerlinF(type, octaves, freq, amp, bias, alpha, beta, random.randu64());
+
+  xInfluence = config.getFloat("xInfluence", 1.0f);
+  yInfluence = config.getFloat("yInfluence", 1.0f);
+}
+
+float PerlinSelector::get(int x, int y) const {
+  return function.get(x * xInfluence, y * yInfluence);
+}
+
+}