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");
}
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.