IncrementalBuild.h

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#pragma once
 
#include "common/Result.h"
#include "procgen/BuildLayerStack.h"
 
#include <cstdint>
#include <unordered_map>
#include <vector>
 
namespace eve::procgen {
 
struct BuildClusterChange {
    int                 x       = 0;
    int                 z       = 0;
    bool                removed = false;
    BuildLayerExecution artifacts;
};
 
class EVENGINE_API_DOMAINS IncrementalBuildDelta {
public:
    [[nodiscard]] int  getCount() const noexcept;
    [[nodiscard]] int  getClusterX(int index) const noexcept;
    [[nodiscard]] int  getClusterZ(int index) const noexcept;
    [[nodiscard]] bool isRemoved(int index) const noexcept;
    [[nodiscard]] Result<BuildLayerExecution> getArtifacts(int index) const;
 
private:
    friend class IncrementalBuildExecutor;
    std::vector<BuildClusterChange> changes_;
};
 
class EVENGINE_API_DOMAINS IncrementalBuildExecutor {
public:
    [[nodiscard]] Result<IncrementalBuildDelta> update(const BuildLayerStack& stack, const Grid2D& grid,
                                                        const PointSet& points, int clusterSizeCells,
                                                        float cellSizeWorld, const PointSet* orientation = nullptr);
    void                                    clear();
    [[nodiscard]] int                       getCachedClusterCount() const noexcept;
    [[nodiscard]] Result<BuildLayerExecution> getCachedArtifacts(int clusterX, int clusterZ) const;
 
private:
    struct Record {
        std::uint64_t       hash = 0;
        BuildLayerExecution artifacts;
    };
    std::unordered_map<std::uint64_t, Record> cache_;
};
 
}  // namespace eve::procgen