program_identity.hpp

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#pragma once
 
#include <pulp/timeline/item_id.hpp>
 
#include <compare>
#include <cstdint>
 
namespace pulp::playback {
 
using ProgramGeneration = std::uint64_t;
 
struct RendererProgramKey {
    timeline::ItemId item_id;
    ProgramGeneration generation = 0;
    constexpr auto operator<=>(const RendererProgramKey&) const = default;
};
 
constexpr bool is_monotonic_renderer_adoption(RendererProgramKey active,
                                              RendererProgramKey candidate) noexcept {
    return candidate.item_id.valid() && candidate.generation != 0 &&
           (active.generation == 0 ||
            (candidate.item_id == active.item_id && candidate.generation > active.generation));
}
 
} // namespace pulp::playback