Method DownloadData

Source/Engine/Graphics/GPUBuffer.cpp:308–348

}

bool GPUBuffer::DownloadData(BytesContainer& result)
{
    // Skip for empty ones
    if (GetSize() == 0)
    {
        LOG(Warning, "Cannot download GPU buffer data from an empty buffer.");
        return true;
    }
    if (_desc.Usage == GPUResourceUsage::StagingReadback || _desc.Usage == GPUResourceUsage::Dynamic || _desc.Usage == GPUResourceUsage::Staging)
    {
        // Use faster path for staging resources
        return GetData(result);
    }
    PROFILE_CPU();

    // Ensure not running on main thread
    if (IsInMainThread())
    {
        // TODO: support mesh data download from GPU on a main thread during rendering
        LOG(Warning, "Cannot download GPU buffer data on a main thread. Use staging readback buffer or invoke this function from another thread.");
        return true;
    }

    // Create async task
    auto task = DownloadDataAsync(result);
    if (task == nullptr)
    {
        LOG(Warning, "Cannot create async download task for resource {0}.", ToString());
        return true;
    }

    // Wait for work to be done
    task->Start();
    if (task->Wait())
    {
        LOG(Warning, "Resource \'{0}\' copy failed.", ToString());
        return true;
    }

    return false;
}

class BufferDownloadDataTask : public ThreadPoolTask
{