使用VK_SHARE_MODE_CONCURRENT时是否需在各队列设置内存屏障？

我们有一个传输队列（A）和一个图形队列（B），通过队列A向顶点缓冲区传输数据完成初始化。

已知若缓冲区以VK_SHARING_MODE_EXCLUSIVE创建，复制命令后需要两个屏障完成队列所有权转移：队列A释放所有权，队列B获取所有权，对应代码如下：

队列A中的代码 #

VkBufferMemoryBarrier barrierA = {
    .sType = VK_STRUCTURE_TYPE_BUFFER_MEMORY_BARRIER,
    .srcAccessMask = VK_ACCESS_TRANSFER_WRITE_BIT,
    .dstAccessMask = 0,
    .srcQueueFamilyIndex = transferQueueFamily,
    .dstQueueFamilyIndex = graphicsQueueFamily,
    .buffer = vertexBuffer,
    .offset = 0,
    .size = VK_WHOLE_SIZE
};

vkCmdPipelineBarrier(transferCmdBuffer,
    VK_PIPELINE_STAGE_TRANSFER_BIT,
    VK_PIPELINE_STAGE_BOTTOM_OF_PIPE_BIT,
    0,
    0, nullptr,
    1, &barrierA,
    0, nullptr);

队列B中的代码 #

VkBufferBarrier barrierB = {
    .sType = VK_STRUCTURE_TYPE_BUFFER_BARRIER,
    .srcAccessMask = 0,
    .dstAccessMask = VK_ACCESS_VERTEX_ATTRIBUTE_READ_BIT,
    .srcQueueFamilyIndex = transferQueueFamily,
    .dstQueueFamilyIndex = graphicsQueueFamily,
    .buffer = vertexBuffer,
    .offset = 0,
    .size = VK_WHOLE_SIZE
};

vkCmdPipelineBarrier(graphicsCmdBuffer,
    VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT,
    VK_PIPELINE_STAGE_VERTEX_INPUT_BIT,
    0,
    0, nullptr,
    1, &barrierB,
    0, nullptr);

我现在的疑问是关于VK_SHARING_MODE_CONCURRENT模式的用法：已知该模式无需进行队列所有权转移，但不确定是否仍需要在两个队列中各设置一个屏障（去掉srcQueueFamilyIndex和dstQueueFamilyIndex，代码如下），还是仅需在图形队列B中设置单个屏障（因为传输队列不支持VK_PIPELINE_STAGE_VERTEX_INPUT_BIT），相关代码示例如下：

方案1：队列A和队列B各设置一个屏障 #

队列A中的代码

VkBufferMemoryBarrier barrierA = {
    .sType = VK_STRUCTURE_TYPE_BUFFER_MEMORY_BARRIER,
    .srcAccessMask = VK_ACCESS_TRANSFER_WRITE_BIT,
    .dstAccessMask = 0,
    .buffer = vertexBuffer,
    .offset = 0,
    .size = VK_WHOLE_SIZE
};

vkCmdPipelineBarrier(transferCmdBuffer,
    VK_PIPELINE_STAGE_TRANSFER_BIT,
    VK_PIPELINE_STAGE_BOTTOM_OF_PIPE_BIT,
    0,
    0, nullptr,
    1, &barrierA,
    0, nullptr);

队列B中的代码

VkBufferBarrier barrierB = {
    .sType = VK_STRUCTURE_TYPE_BUFFER_BARRIER,
    .srcAccessMask = 0,
    .dstAccessMask = VK_ACCESS_VERTEX_ATTRIBUTE_READ_BIT,
    .offset = 0,
    .size = VK_WHOLE_SIZE
};

vkCmdPipelineBarrier(graphicsCmdBuffer,
    VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT,
    VK_PIPELINE_STAGE_VERTEX_INPUT_BIT,
    0,
    0, nullptr,
    1, &barrierB,
    0, nullptr);

方案2：仅在队列B中设置单个屏障 #

VkBufferBarrier barrierB = {
    .sType = VK_STRUCTURE_TYPE_BUFFER_BARRIER,
    .srcAccessMask = VK_PIPELINE_STAGE_TRANSFER_BIT,
    .dstAccessMask = VK_ACCESS_VERTEX_ATTRIBUTE_READ_BIT,
    .offset = 0,
    .size = VK_WHOLE_SIZE
};

vkCmdPipelineBarrier(graphicsCmdBuffer,
    VK_PIPELINE_STAGE_TRANSFER_BIT,
    VK_PIPELINE_STAGE_VERTEX_INPUT_BIT,
    0,
    0, nullptr,
    1, &barrierB,
    0, nullptr);

内容的提问来源于stack exchange，提问作者tuket