Program Listing for File CoalGeometryCache.h

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/**
 * @file
 * @brief Contains the declarations for the CoalGeometryCache class.
 */

#pragma once
#include "Karana/KCore/Id.h"
#include "Karana/KCore/SharedPointer.h"
#include "Karana/Scene/StaticGeometry.h"
#include <memory>
#include <unordered_map>

namespace coal {
    class CollisionGeometry; // forward declaration. Full class included in the cc file.
}

namespace Karana::Scene {
    /// Helper to cache and reuse native COAL geometries
    class CoalGeometryCache {
      public:
        CoalGeometryCache() = default;
        ~CoalGeometryCache() = default;

        // Disable copying/moving to avoid issues with the
        // this pointer captured by the custom deleters used
        // to clean up the CollisionGeometry weak pointers
        CoalGeometryCache(const CoalGeometryCache &) = delete;
        CoalGeometryCache &operator=(const CoalGeometryCache &) = delete;
        CoalGeometryCache(CoalGeometryCache &&) = delete;
        CoalGeometryCache &operator=(CoalGeometryCache &&) = delete;

        /**
         * @brief Get the native COAL geometry for a Scene Geometry
         * @param geometry - A Scene Geometry
         * @return A corresponding COAL geometry
         */
        Karana::Core::ks_ptr<coal::CollisionGeometry> get(const VarStaticGeometry &geometry) const;

      private:
        mutable std::unordered_map<Karana::Core::id_t, std::weak_ptr<coal::CollisionGeometry>>
            _geometry_map;
    };
} // namespace Karana::Scene