VKCMDCOPYBUFFER对分期缓冲液的转移没有影响

对于使用Vulkan-HPP和Vulkan内存分配器的Vulkan渲染器，我试图使用登台缓冲区将顶点数据传输到GPU。不使用中间分期缓冲区，可以渲染传输作品和网格没有任何问题（仅使用VMA_MEMORY_USAGE_CPU_TO_GPU创建的单个缓冲区）。但是，通过呼叫vkcmdcopybuffer，由此产生的顶点仅包含0（用Nsight检查）。认为可能需要使用壁垒同步我尝试以下代码，但仍然存在相同的问题。

也许需要将命令缓冲区与后来的命令缓冲区绑定和从顶点缓冲区进行采购同步？尽管我在任何教程中都没有看到或提到过。

// vulkan initialization
// VmaAllocator initialization
std::vector<Vertex> vertices = { /*filled*/ };
auto vertexBufferSize = vertices.size() * sizeof(Vertex);
vk::Buffer stagingBuffer;
auto ci = vk::BufferCreateInfo().
    setUsage(vk::BufferUsageFlagBits::eTransferSrc).
    setSharingMode(vk::SharingMode::eExclusive).
    setSize(vertexBufferSize );
VmaAllocationCreateInfo allocationCI = {};
allocationCI.usage = VMA_MEMORY_USAGE_CPU_ONLY;
vmaCreateBuffer(allocator, (VkBufferCreateInfo*)&ci,
    &allocationCI, (VkBuffer*)&stagingBuffer, &allocation, nullptr);
void* pVBufMem = nullptr;
vmaMapMemory(allocator, allocation, &pVBufMem);
std::memcpy(pVBufMem, vertices.size(), vertexBufferSize );
vmaUnmapMemory(allocator, allocation);
vk::Buffer vertexBuffer;
ci = vk::BufferCreateInfo().
    setUsage(vk::BufferUsageFlagBits::eTransferDst | vk::BufferUsageFlagBits::eVertexBuffer).
    setSharingMode(vk::SharingMode::eExclusive).
    setSize(vertexBufferSize);
allocationCI = {};
allocationCI.usage = VMA_MEMORY_USAGE_GPU_ONLY;
vmaCreateBuffer(allocator, (VkBufferCreateInfo*)&ci,
    &allocationCI, (VkBuffer*)&vertexBuffer, &allocation, nullptr);
// copy staging buffer to vertex buffer
auto allocCI = vk::CommandBufferAllocateInfo().
    setCommandBufferCount(1).
    setCommandPool(pool).
    setLevel(vk::CommandBufferLevel::ePrimary);
auto cmd = device.allocateCommandBuffers(allocCI)[0];
cmd.begin({ vk::CommandBufferUsageFlagBits::eOneTimeSubmit });
// barrier host write -> copyBuffer read
auto bufferMemoryBarrier = vk::BufferMemoryBarrier()
.setBuffer(stagingBuffer)
.setSize(vertexBufferSize)
.setSrcAccessMask(vk::AccessFlagBits::eMemoryWrite)
.setDstAccessMask(vk::AccessFlagBits::eTransferRead)
.setSrcQueueFamilyIndex(VK_QUEUE_FAMILY_IGNORED)
.setDstQueueFamilyIndex(VK_QUEUE_FAMILY_IGNORED);
cmd.pipelineBarrier(
    vk::PipelineStageFlagBits::eAllCommands, vk::PipelineStageFlagBits::eAllCommands, {},
    { }, { bufferMemoryBarrier }, { });
cmd.copyBuffer(stagingBuffer, vertexBuffer, { 0, 0, vertexBufferSize });
// copyBuffer write -> vertex read
bufferMemoryBarrier = vk::BufferMemoryBarrier()
.setBuffer(vertexBuffer)
.setSize(vertexBufferSize)
.setSrcAccessMask(vk::AccessFlagBits::eTransferWrite)
.setDstAccessMask(vk::AccessFlagBits::eVertexAttributeRead)
.setSrcQueueFamilyIndex(VK_QUEUE_FAMILY_IGNORED)
.setDstQueueFamilyIndex(VK_QUEUE_FAMILY_IGNORED);
cmd.pipelineBarrier(
    vk::PipelineStageFlagBits::eAllCommands, vk::PipelineStageFlagBits::eAllCommands, {},
    { }, { bufferMemoryBarrier }, { });
cmd.end();
auto submitInfo = vk::SubmitInfo().
    setCommandBufferCount(1).
    setPCommandBuffers(&cmdBuffer);
queue.submit({ submitInfo }, {});
queue.waitIdle();