How to put MTLTexture into ImGuiImage from dictionary?

[tanelxen]

That question mainly about pointers management in Swift than SwiftImGui as is.

I'm trying to add thumbnail in asset browser, but get bad access because pointer to texture isn't valid at the moment when ImGuiImage have to be rendered.

I hold textures for thumbnails in dictionary and render it like this:

var textures: [String: MTLTexture]
....
let ptr = withUnsafePointer(to: &textures[name]) { ptr in
    return UnsafeMutableRawPointer(mutating: ptr)
}

ImGuiImage(
    ptr,
    ImVec2(24, 24),
    ImVec2(0, 0),
    ImVec2(1, 1),
    ImVec4(1, 1, 1, 1),
    ImVec4(1, 1, 1, 1)
)

It would be nice to use ids instead of pointers.

[tanelxen]

Well, I've managed it with proxy-class:

final class TextureProxy {
    let name: String
    var texture: MTLTexture?
    
    var ptr: UnsafeMutableRawPointer {
        withUnsafePointer(to: &texture) { ptr in
            return UnsafeMutableRawPointer(mutating: ptr)
        }
    }

    init(name: String) {
        self.name = name
    }
}

It makes us to be sure that the pointer will always be same.