SdlDependencyResolver.h

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#pragma once
 
#include "SDL/sdl_fwd.h"
#include "Utility/TSpan.h"
 
#include <string>
#include <string_view>
#include <unordered_map>
#include <vector>
#include <cstddef>
#include <queue>
#include <optional>
 
namespace ph
{
 
class SdlDependencyResolver final
{
public:
    SdlDependencyResolver();
 
    void analyze(
        TSpanView<const ISdlResource*> resources,
        TSpanView<std::string> resourceNames = {});
 
    const ISdlResource* next();
 
    std::string_view getResourceName(const ISdlResource* resource) const;
 
private:
    struct ResourceInfo
    {
        const ISdlResource* resource;
        std::string         name;
 
        inline ResourceInfo() :
            resource(nullptr), name()
        {}
    };
 
    std::vector<ResourceInfo>                            m_resourceInfos;
    std::queue<const ISdlResource*>                      m_queuedResources;
    std::unordered_map<const ISdlResource*, std::size_t> m_resourceToInfoIndex;
 
    void calcDispatchOrderFromTopologicalSort();
    std::optional<std::size_t> getResourceInfoIdx(const ISdlResource* resource) const;
};
 
}// end namespace ph