vkDeviceWait空闲后，Vulkan CommandBuffer正在使用

Question

在我的程序初始化期间，我想使用一些单时间命令缓冲区用于图像布局过渡和加速结构构建等。

然而，我似乎不能释放命令缓冲区一旦它完成。

VkCommandBuffer AppContext::singleTimeCommandBuffer() const {
VkCommandBuffer ret;
auto allocInfo = vks::initializers::commandBufferAllocateInfo(vkCommandPool, VK_COMMAND_BUFFER_LEVEL_PRIMARY, 1);
vkCheck(vkAllocateCommandBuffers(vkDevice, &allocInfo, &ret));
auto beginInfo = vks::initializers::commandBufferBeginInfo();
beginInfo.flags = VK_COMMAND_BUFFER_USAGE_ONE_TIME_SUBMIT_BIT;
vkCheck(vkBeginCommandBuffer(ret, &beginInfo));
return ret;
}
void AppContext::endSingleTimeCommands(VkCommandBuffer cmdBuffer) const {
vkCheck(vkEndCommandBuffer(cmdBuffer));
auto submitInfo = vks::initializers::submitInfo(&cmdBuffer);
vkQueueSubmit(queues.graphics, 1, &submitInfo, VK_NULL_HANDLE);
vkQueueWaitIdle(queues.graphics);
// Overkill, I know
vkDeviceWaitIdle(vkDevice);
vkFreeCommandBuffers(vkDevice, vkCommandPool, 1, &cmdBuffer);
}

产生以下验证错误:

VUID-vkFreeCommandBuffers-pCommandBuffers-00047(ERROR / SPEC): msgNum: 448332540 - Validation Error: [ VUID-vkFreeCommandBuffers-pCommandBuffers-00047 ] Object 0: handle = 0x5586acaeff78, type = VK_OBJECT_TYPE_COMMAND_BUFFER; | MessageID = 0x1ab902fc | Attempt to free VkCommandBuffer 0x5586acaeff78[] which is in use. The Vulkan spec states: All elements of pCommandBuffers must not be in the pending state (https://vulkan.lunarg.com/doc/view/1.2.182.0/linux/1.2-extensions/vkspec.html#VUID-vkFreeCommandBuffers-pCommandBuffers-00047)
Objects: 1
[0] 0x5586acaeff78, type: 6, name: NULL

我不明白这有什么意义，因为VkQueueWaitIdle以及vkDeviceWaitIdle应该确保命令缓冲区不处于挂起状态。是我误解了Vulkan的规格，还是我偶然发现了视频驱动程序中的错误，或者可能是验证层?

Answer 1

您没有检查vkqueuessubmit ()， vkQueueWaitIdle()或vkDeviceWaitIdle()的返回值。有失败的吗?可能导致此错误。