Create Image with Optimal tiling and HOST_ACCESS_SEQUENTIAL_WRITE memory flag

[FuXiii]

My device support create VkImage with Optimal tiling, TRANSFER_DST usage in format B8G8R8A8_UNORM

Then, I use pure Vulkan API try to create VkImage:

It created successfully

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and then I try to use VMA call vmaCreateImage to create image:

VmaAllocator *vma_allocator = (VmaAllocator *)(this->device->GetVmaAllocator()->GetVmaAllocator());
VkResult result = vmaCreateImage(*vma_allocator, &vk_image_create_info, &alloc_info, &this->vkImage, (VmaAllocation *)this->vmaAllocation, nullptr);

the create result return VK_ERROR_FEATURE_NOT_PRESENT

Why? Is that means if I use Optimal tiling, I must use DEDICATED_MEMORY?
If I use Linear tiling with HOST_ACCESS_SEQUENTIAL_WRITE to create image, and then copy some GPU domain resource data into it. Is this the correct usage for Linear tiling image?

[adam-sawicki-a]

Error code VK_ERROR_FEATURE_NOT_PRESENT likely means that no memory type was found that would support the combination of parameters you want to use for created image.

I guess the problem is that you pass HOST_ACCESS_SEQUENTIAL_WRITE flag. This flag means you want to use Map on this image, so VMA will try to find a memory type that is HOST_VISIBLE. Likely images with optimal tiling cannot be created in such memory. If you only want to use a copy operation on that image and not Map, you don't need HOST_ACCESS_SEQUENTIAL_WRITE flag.

[FuXiii]

Thank you for your answer~⌯'▾'⌯