godotengine
Using MSAA with custom render passes
Your Godot version:
4.4.1
Issue description:
When rendering to a texture using RenderingDevice, as far as I have been able to tell, the ideal way to resolve a multisampled texture is through providing a resolve texture with RDTextureFormat.is_resolve_buffer set to true when creating the framebuffer. RenderingdDevice.framebuffer_create() then automatically sets the texture to be resolved as a resolve attachment in a subpass. From reading the vulkan documentation, it sounds like this method should be much more efficient than RenderingdDevice.texture_resolve_multisample() which uses vkCmdResolveImage() under the hood.
This behavior of RenderingdDevice.framebuffer_create() does not seem to be documented, and as far as I can tell the only way to discover that RDTextureFormat.is_resolve_buffer exists is to stumble across it on the RDTextureFormat page.
I would create a PR myself except I am not 100% confident in my understanding of how this works.
When using framebuffer_create_multipass(), the same setup can be created by adding the index of the resolve texture to resolve_attachments in an RDFramebufferPass (where the RDFramebufferPass is a required input of the function). This usage does not depend on RDTextureFormat.is_resolve_buffer being set to true. This behavior is slightly more self-explanatory as people will need to look at the documentation for RDFramebufferPass anyways during this step, which probably has enough information on it already.
URL to the documentation page (if already existing): https://docs.godotengine.org/en/stable/classes/class_renderingdevice.html
