A better design for vkMapMemory function about vulkan HOT 6 CLOSED

Hello @mackst, thanks for the example.

I don't exactly understand your question, is it working with your example ? What do you want to change with VkMapMemory ?

from vulkan.

Yes it works. What I want is VkMapMemory either can be a more lower or higher level function.

lower level just like above user can define their data pointer to pass to VkMapMemory function.
higher level would be VkMapMemory function can take array instance cast to data pointer and return the pointer.
For higher level may also need to support numpy array in the future.

from vulkan.

If I understand correctly your issue, you want to pass a custom ppda whereas currently you can't because the wrapper do it for you and return the ppda pointer.

Moreover, managing yourself the ppda would allow you to reuse the pointer.

Is is what your are saying ?

from vulkan.

Yes

from vulkan.

OK @mackst.
I noticed that in your example, you allocate the ppda pointer before calling VkMapMemory. By doing that, VkMapMemory will replace the address in the pointer by the mapped address. So I don't understand why you allocate memory for the pointer.
VkMapMemory allows you to update the memory directly in the GPU. I don't think it's a good idea to reuse a reference across several VkMapMemory because you can't be sure that the mapping will be done at the same place in the memory.

Maybe you are trying to resolve a no-issue.
If I don't fully understand your need, don't hesitate to correct me but I think VkMapMemory works as expected.

from vulkan.

I try again. I think your are right

from vulkan.