Replace texture image data about hudhook HOT 4 CLOSED

For dx11 and dx12, uploadbuffer RowPitch must be aligned to 256 bytes (64 pixels). Might also fix this to support images with arbitrary width.

from hudhook.

That's an unrelated issue -- could you please open a new one so we can track that separately?

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I did some experiments early today, but on an old version 799032b from Jan, when there was only DX12 renderer.

I split create_texture_inner into create_texture_inner + upload_texture_inner, then added replace_image to RenderEngine.

Here is the quick (and dirty) patch file for future reference. I haven't written any raw DX12 before, so there might be some bugs.
split_create_texture_and_upload_texture.patch on 799032b

When I have some more spare time, I will take a look at renderers of other APIs.

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That's a good starting point, thank you!

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