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v1.4.4

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Aria 2025-03-21 22:23:30 +11:00
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source/game/terrain/StarIslandSurfaceSelector.cpp Normal file
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#include "StarIslandSurfaceSelector.hpp"
#include "StarGameTypes.hpp"
#include "StarRandom.hpp"
#include "StarJsonExtra.hpp"
namespace Star {
char const* const IslandSurfaceSelector::Name = "islandSurface";
IslandSurfaceSelector::IslandSurfaceSelector(Json const& config, TerrainSelectorParameters const& parameters)
: TerrainSelector(Name, config, parameters) {
layerBaseHeight = parameters.baseHeight;
worldWidth = parameters.worldWidth;
islandElevation = config.getFloat("islandElevation");
islandTaperPoint = config.getFloat("islandTaperPoint");
islandHeight = PerlinF(config.getObject("islandHeight"), staticRandomU64(parameters.seed, parameters.baseHeight, "islandHeight"));
islandDepth = PerlinF(config.getObject("islandDepth"), staticRandomU64(parameters.seed, parameters.baseHeight, "islandDepth"));
islandDecision = PerlinF(config.getObject("islandDecision"), staticRandomU64(parameters.seed, parameters.baseHeight, "islandDecision"));
}
IslandColumn IslandSurfaceSelector::generateColumn(int x) const {
float noiseAngle = 2 * Constants::pi * x / worldWidth;
float noiseX = (std::cos(noiseAngle) * worldWidth) / (2 * Constants::pi);
float noiseY = (std::sin(noiseAngle) * worldWidth) / (2 * Constants::pi);
IslandColumn newCol;
float thisIslandDecision = islandDecision.get(noiseX, noiseY);
if (thisIslandDecision > 0) {
float taperFactor = thisIslandDecision < islandTaperPoint ? std::sin((0.5 * Constants::pi * thisIslandDecision) / islandTaperPoint) : 1.0f;
newCol.topLevel = islandElevation + layerBaseHeight + taperFactor * islandHeight.get(noiseX, noiseY);
newCol.bottomLevel = islandElevation + layerBaseHeight - taperFactor * islandDepth.get(noiseX, noiseY);
} else {
newCol.topLevel = layerBaseHeight;
newCol.bottomLevel = layerBaseHeight;
}
return newCol;
}
float IslandSurfaceSelector::get(int x, int y) const {
auto col = columnCache.get(x, [=](int x) {
return IslandSurfaceSelector::generateColumn(x);
});
return (col.topLevel - col.bottomLevel) / 2 - abs((col.topLevel + col.bottomLevel) / 2 - y);
}
}