70 lines
2.6 KiB
C++
70 lines
2.6 KiB
C++
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#include "StarDisplacementSelector.hpp"
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#include "StarRandom.hpp"
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#include "StarJsonExtra.hpp"
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namespace Star {
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char const* const DisplacementSelector::Name = "displacement";
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DisplacementSelector::DisplacementSelector(
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Json const& config, TerrainSelectorParameters const& parameters, TerrainDatabase const* database)
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: TerrainSelector(Name, config, parameters) {
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RandomSource random(parameters.seed);
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auto xType = PerlinTypeNames.getLeft(config.getString("xType"));
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auto xOctaves = config.getFloat("xOctaves");
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auto xFreq = config.getFloat("xFreq");
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auto xAmp = config.getFloat("xAmp");
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auto xBias = config.getFloat("xBias", 0.0f);
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auto xAlpha = config.getFloat("xAlpha", 2.0f);
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auto xBeta = config.getFloat("xBeta", 2.0f);
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xDisplacementFunction = PerlinF(xType, xOctaves, xFreq, xAmp, xBias, xAlpha, xBeta, random.randu64());
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auto yType = PerlinTypeNames.getLeft(config.getString("yType"));
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auto yOctaves = config.getFloat("yOctaves");
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auto yFreq = config.getFloat("yFreq");
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auto yAmp = config.getFloat("yAmp");
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auto yBias = config.getFloat("yBias", 0.0f);
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auto yAlpha = config.getFloat("yAlpha", 2.0f);
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auto yBeta = config.getFloat("yBeta", 2.0f);
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yDisplacementFunction = PerlinF(yType, yOctaves, yFreq, yAmp, yBias, yAlpha, yBeta, random.randu64());
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xXInfluence = config.getFloat("xXInfluence", 1.0f);
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xYInfluence = config.getFloat("xYInfluence", 1.0f);
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yXInfluence = config.getFloat("yXInfluence", 1.0f);
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yYInfluence = config.getFloat("yYInfluence", 1.0f);
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yClamp = config.contains("yClamp");
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if (yClamp) {
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yClampRange = jsonToVec2F(config.get("yClamp"));
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yClampSmoothing = config.getFloat("yClampSmoothing", 0);
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}
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auto sourceConfig = config.get("source");
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String sourceType = sourceConfig.getString("type");
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m_source = database->createSelectorType(sourceType, sourceConfig, parameters);
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}
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float DisplacementSelector::get(int x, int y) const {
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auto x_ = x + xDisplacementFunction.get(x * xXInfluence, y * xYInfluence);
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auto y_ = y + clampY(yDisplacementFunction.get(x * yXInfluence, y * yYInfluence));
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return m_source->get(x_, y_);
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}
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float DisplacementSelector::clampY(float v) const {
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if (!yClamp)
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return v;
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if (yClampSmoothing == 0)
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return clamp(v, yClampRange[0], yClampRange[1]);
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return 0.2f * (clamp(v - yClampSmoothing, yClampRange[0], yClampRange[1])
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+ clamp(v - 0.5f * yClampSmoothing, yClampRange[0], yClampRange[1])
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+ clamp(v, yClampRange[0], yClampRange[1])
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+ clamp(v + 0.5f * yClampSmoothing, yClampRange[0], yClampRange[1])
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+ clamp(v + yClampSmoothing, yClampRange[0], yClampRange[1]));
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}
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}
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