Why is my subpass input attachment layout invalid?

Question

I'm building a headless vulkan renderer and cannot understand this validation error I received:

VUID-VkAttachmentReference-layout-parameter(ERROR / SPEC): msgNum: 1971405941 - Validation
Error: [ VUID-VkAttachmentReference-layout-parameter ] Object 0: handle = 0x7faea7064018, type =
VK_OBJECT_TYPE_DEVICE; | MessageID = 0x75814475 | vkCreateRenderPass: value of pCreateInfo-
>pSubpasses[0].pInputAttachments[1941].layout (3302454) does not fall within the begin..end
range of the core VkImageLayout enumeration tokens and is not an extension added token. The
Vulkan spec states: layout must be a valid VkImageLayout value
(https://vulkan.lunarg.com/doc/view/1.2.162.1/mac/1.2-extensions/vkspec.html#VUID-
VkAttachmentReference-layout-parameter)
    Objects: 1
        [0] 0x7faea7064018, type: 3, name: NULL

I have tried everything I could and I just do not understand what is the issue. I am following this example which shows how to render headless and this more general tutorial and even when my code is nearly identical to those two examples causes 1941 of this exact validation error proceeded by a segmentation fault.

The code for the function that causes the error:

void Renderer::CreateRenderPass(VkFormat depth_format) {
  VkAttachmentDescription attachments[2];
  attachments[0].format = VK_FORMAT_R8G8B8_UNORM;
  attachments[0].samples = VK_SAMPLE_COUNT_1_BIT;
  attachments[0].loadOp = VK_ATTACHMENT_LOAD_OP_CLEAR;
  attachments[0].storeOp = VK_ATTACHMENT_STORE_OP_STORE;
  attachments[0].initialLayout = VK_IMAGE_LAYOUT_UNDEFINED;
  attachments[0].stencilLoadOp = VK_ATTACHMENT_LOAD_OP_DONT_CARE;
  attachments[0].stencilStoreOp = VK_ATTACHMENT_STORE_OP_DONT_CARE;
  attachments[0].finalLayout = VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL;

  attachments[1].format = depth_format;
  attachments[1].samples = VK_SAMPLE_COUNT_1_BIT;
  attachments[1].loadOp = VK_ATTACHMENT_LOAD_OP_CLEAR;
  attachments[1].initialLayout = VK_IMAGE_LAYOUT_UNDEFINED;
  attachments[1].storeOp = VK_ATTACHMENT_STORE_OP_DONT_CARE;
  attachments[1].stencilLoadOp = VK_ATTACHMENT_LOAD_OP_DONT_CARE;
  attachments[1].stencilStoreOp = VK_ATTACHMENT_STORE_OP_DONT_CARE;
  attachments[1].finalLayout = VK_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL;

  VkAttachmentReference color_ref;
  color_ref.attachment = 0;
  color_ref.layout = VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL;

  VkAttachmentReference depth_ref;
  depth_ref.attachment = 1;
  depth_ref.layout = VK_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL;

  VkSubpassDescription subpass;
  subpass.colorAttachmentCount = 1;
  subpass.pColorAttachments = &color_ref;
  subpass.pDepthStencilAttachment = &depth_ref;
  subpass.pipelineBindPoint = VK_PIPELINE_BIND_POINT_GRAPHICS;

  VkSubpassDependency dependencies[2];

  dependencies[0].dstSubpass = 0;
  dependencies[0].srcSubpass = VK_SUBPASS_EXTERNAL;
  dependencies[0].srcAccessMask = VK_ACCESS_MEMORY_READ_BIT;
  dependencies[0].dependencyFlags = VK_DEPENDENCY_BY_REGION_BIT;
  dependencies[0].srcStageMask = VK_PIPELINE_STAGE_BOTTOM_OF_PIPE_BIT;
  dependencies[0].dstAccessMask = VK_ACCESS_COLOR_ATTACHMENT_READ_BIT
                                | VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT;
  dependencies[0].dstStageMask = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT;

  dependencies[1].srcSubpass = 0;
  dependencies[1].dstSubpass = VK_SUBPASS_EXTERNAL;
  dependencies[1].dstAccessMask = VK_ACCESS_MEMORY_READ_BIT;
  dependencies[1].dependencyFlags = VK_DEPENDENCY_BY_REGION_BIT;
  dependencies[1].dstStageMask = VK_PIPELINE_STAGE_BOTTOM_OF_PIPE_BIT;
  dependencies[1].srcAccessMask = VK_ACCESS_COLOR_ATTACHMENT_READ_BIT
                                | VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT;
  dependencies[1].srcStageMask = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT;

  VkRenderPassCreateInfo render_pass_info;
  render_pass_info.pNext = nullptr;
  render_pass_info.subpassCount = 1;
  render_pass_info.attachmentCount = 2;
  render_pass_info.dependencyCount = 2;
  render_pass_info.pSubpasses = &subpass;
  render_pass_info.pAttachments = attachments;
  render_pass_info.pDependencies = dependencies;
  render_pass_info.sType = VK_STRUCTURE_TYPE_RENDER_PASS_CREATE_INFO;

  if (vkCreateRenderPass(device_, &render_pass_info, nullptr, &render_pass_))
    throw std::runtime_error("failed to create render pass");
}

krOoze · Accepted Answer · 2021-05-05 22:23:50Z

4

VkSubpassDescription subpass;
subpass.colorAttachmentCount = 1;
subpass.pColorAttachments = &color_ref;
subpass.pDepthStencilAttachment = &depth_ref;
subpass.pipelineBindPoint = VK_PIPELINE_BIND_POINT_GRAPHICS;

Several members here are uninitialized. Among them subpass.inputAttachmentCount and subpass.pInputAttachments. So that array contains garbage, including the layout member, which is the value of 3302454, being none of the existing VkImageLayout enumerants.

answered May 5, 2021 at 22:23

krOoze

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1 Comment

TheNeuronalCoder Over a year ago

thank you so much! i filled in all the members and it fixed the validation errors.

TheNeuronalCoder · Accepted Answer · 2021-05-05 23:10:34Z

1

Thanks to @krOoze, I found that the issue was that I did not initialize many subpass parameters. But he did mention that you also needed to set subpass.pResolveAttachments to a null pointer.

VkSubpassDescription subpass;
subpass.colorAttachmentCount = 1;
subpass.inputAttachmentCount = 0;
subpass.pInputAttachments = nullptr;
subpass.pResolveAttachments = nullptr;
subpass.pColorAttachments = &color_ref;
subpass.pDepthStencilAttachment = &depth_ref;
subpass.pipelineBindPoint = VK_PIPELINE_BIND_POINT_GRAPHICS;

answered May 5, 2021 at 23:10

TheNeuronalCoder

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