Function EnsureSources

3rdparty/openal/al/source.cpp:497–520

bool EnsureSources(ALCcontext *context, size_t needed)
{
    size_t count{std::accumulate(context->mSourceList.cbegin(), context->mSourceList.cend(),
        size_t{0},
        [](size_t cur, const SourceSubList &sublist) noexcept -> size_t
        { return cur + static_cast<ALuint>(POPCNT64(sublist.FreeMask)); }
    )};

    while(needed > count)
    {
        if UNLIKELY(context->mSourceList.size() >= 1<<25)
            return false;

        context->mSourceList.emplace_back();
        auto sublist = context->mSourceList.end() - 1;
        sublist->FreeMask = ~0_u64;
        sublist->Sources = static_cast<ALsource*>(al_calloc(alignof(ALsource), sizeof(ALsource)*64));
        if UNLIKELY(!sublist->Sources)
        {
            context->mSourceList.pop_back();
            return false;
        }
        count += 64;
    }
    return true;
}