103 lines
2.9 KiB
C++
103 lines
2.9 KiB
C++
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#ifndef STAR_BIOME_PLACEMENT_HPP
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#define STAR_BIOME_PLACEMENT_HPP
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#include "StarPerlin.hpp"
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#include "StarWeightedPool.hpp"
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#include "StarBiMap.hpp"
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#include "StarPlant.hpp"
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#include "StarTreasure.hpp"
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#include "StarStrongTypedef.hpp"
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namespace Star {
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STAR_CLASS(BiomeItemDistribution);
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STAR_EXCEPTION(BiomeException, StarException);
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typedef pair<TreeVariant, TreeVariant> TreePair;
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// Weighted pairs of object name / parameters.
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typedef WeightedPool<pair<String, Json>> ObjectPool;
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strong_typedef(String, TreasureBoxSet);
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strong_typedef(StringSet, MicroDungeonNames);
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typedef Variant<GrassVariant, BushVariant, TreePair, ObjectPool, TreasureBoxSet, MicroDungeonNames> BiomeItem;
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BiomeItem variantToBiomeItem(Json const& store);
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Json variantFromBiomeItem(BiomeItem const& biomeItem);
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enum class BiomePlacementArea { Surface, Underground };
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enum class BiomePlacementMode { Floor, Ceiling, Background, Ocean };
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extern EnumMap<BiomePlacementMode> const BiomePlacementModeNames;
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struct BiomeItemPlacement {
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BiomeItemPlacement(BiomeItem item, Vec2I position, float priority);
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// Orders by priority
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bool operator<(BiomeItemPlacement const& rhs) const;
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BiomeItem item;
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Vec2I position;
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float priority;
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};
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class BiomeItemDistribution {
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public:
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struct PeriodicWeightedItem {
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BiomeItem item;
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PerlinF weight;
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};
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static Maybe<BiomeItem> createItem(Json const& itemSettings, RandomSource& rand, float biomeHueShift);
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BiomeItemDistribution();
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BiomeItemDistribution(Json const& config, uint64_t seed, float biomeHueShift = 0.0f);
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BiomeItemDistribution(Json const& store);
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Json toJson() const;
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BiomePlacementMode mode() const;
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List<BiomeItem> allItems() const;
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// Returns the best BiomeItem for this position out of the weighted item set,
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// if the density function specifies that an item should go in this position.
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Maybe<BiomeItemPlacement> itemToPlace(int x, int y) const;
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private:
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enum class DistributionType {
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// Pure random distribution
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Random,
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// Uses perlin noise to morph a periodic function into a less predictable
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// periodic clumpy noise.
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Periodic
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};
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static EnumMap<DistributionType> const DistributionTypeNames;
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BiomePlacementMode m_mode;
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DistributionType m_distribution;
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float m_priority;
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// Used if the distribution type is Random
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float m_blockProbability;
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uint64_t m_blockSeed;
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List<BiomeItem> m_randomItems;
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// Used if the distribution type is Periodic
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PerlinF m_densityFunction;
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PerlinF m_modulusDistortion;
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int m_modulus;
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int m_modulusOffset;
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// Pairs items with a periodic weight. Weight will vary over the space of
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// the distribution, If multiple items are present, this can be used to
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// select one of the items (with the highest weight) out of a list of items,
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// causing items to be grouped spatially in a way determined by the shape of
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// each weight function.
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List<pair<BiomeItem, PerlinF>> m_weightedItems;
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};
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}
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#endif
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