MarchingCubes.h

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#pragma once
 
#include "procgen/MeshBuild.h"
#include "procgen/ParamSchema.h"
#include "procgen/Params.h"
 
#include <functional>
#include <string>
#include <unordered_map>
#include <vector>
 
namespace eve::procgen {
 
EVENGINE_API_DOMAINS bool marchingCubes(const float *density, int nx, int ny, int nz, float isolevel, MeshBuild &out,
                                        std::string *error = nullptr);
 
EVENGINE_API_DOMAINS bool fillDensityField(const Params &params, std::vector<float> &density, int &nx, int &ny, int &nz,
                                           std::string &error);
 
bool generateMarchingCubesMesh(const Params &params, MeshBuild &out, std::string &error);
 
bool generateHexPlanetMesh(const Params &params, MeshBuild &out, std::string &error);
 
using MeshRecipeFn = std::function<bool(const Params &params, MeshBuild &out, std::string &error)>;
 
class EVENGINE_API_DOMAINS MeshRecipeRegistry {
public:
    static MeshRecipeRegistry &instance();
 
    void registerRecipe(const std::string &id, MeshRecipeFn fn);
    void registerRecipe(RecipeDescriptor descriptor, MeshRecipeFn fn);
    bool has(const std::string &id) const;
    bool generate(const std::string &id, const Params &params, MeshBuild &out,
                  std::string &error) const;
    std::vector<std::string> list() const;
    const RecipeDescriptor *descriptor(const std::string &id) const;
    bool applyDefaults(const std::string &id, Params &params) const;
 
    void registerBuiltins();
 
private:
    struct Entry {
        MeshRecipeFn fn;
        RecipeDescriptor descriptor;
    };
    MeshRecipeRegistry() = default;
    std::unordered_map<std::string, Entry> recipes_;
    bool builtinsRegistered_ = false;
};
 
}  // namespace eve::procgen