Function EnsureBuffers

3rdparty/openal/al/buffer.cpp:283–305

bool EnsureBuffers(ALCdevice *device, size_t needed)
{
    size_t count{std::accumulate(device->BufferList.cbegin(), device->BufferList.cend(), size_t{0},
        [](size_t cur, const BufferSubList &sublist) noexcept -> size_t
        { return cur + static_cast<ALuint>(POPCNT64(sublist.FreeMask)); }
    )};

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

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