VK_KHR_imageless_framebuffer.md

VK_KHR_imageless_framebuffer

Promoted to core in Vulkan 1.2

When creating a VkFramebuffer you normally need to pass the VkImageViews being used in VkFramebufferCreateInfo::pAttachments.

To use an imageless VkFramebuffer

• Make sure the implementation has support for it by querying VkPhysicalDeviceImagelessFramebufferFeatures::imagelessFramebuffer or VkPhysicalDeviceVulkan12Features::imagelessFramebuffer
• Set the VK_FRAMEBUFFER_CREATE_IMAGELESS_BIT in VkFramebufferCreateInfo::flags
• Include a VkFramebufferAttachmentsCreateInfo struct in the VkFramebufferCreateInfo::pNext
• When beginning the render pass, pass in a VkRenderPassAttachmentBeginInfo structure into VkRenderPassBeginInfo::pNext with the compatible attachments

// Fill information about attachment
VkFramebufferAttachmentImageInfo attachments_image_info = {};
// ...

VkFramebufferAttachmentsCreateInfo attachments_create_info = {};
// ...
attachments_create_info.attachmentImageInfoCount = 1;
attachments_create_info.pAttachmentImageInfos = &attachments_image_info;

// Create FrameBuffer as imageless
VkFramebufferCreateInfo framebuffer_info = {};
framebuffer_info.pNext = &attachments_create_info;
framebuffer_info.flags |= VK_FRAMEBUFFER_CREATE_IMAGELESS_BIT;
// ...
framebffer_info.pAttachments = NULL; // pAttachments is ignored here now

vkCreateFramebuffer(device, &framebuffer_info, NULL, &framebuffer_object);

// ...

// Start recording a command buffer
VkRenderPassAttachmentBeginInfo attachment_begin_info = {};
// attachment_begin_info.pAttachments contains VkImageView objects

VkRenderPassBeginInfo begin_info = {};
begin_info.pNext = &attachment_begin_info;
// ...

vkCmdBeginRenderPass(command_buffer, &begin_info, VK_SUBPASS_CONTENTS_INLINE);