partcl | ParTcl - a micro Tcl implementation | Interpreter library

I'm trying to get multisampling working with MTKView. I have an MTKView with a delegate. I set the view's sampleCount property to 4. I create a pipeline state descriptor with the rasterSampleCount set to 4, and use that to make a render pipeline state that I use when rendering.

In the delegate's draw(in:) method, I create a render pass descriptor by getting the view's current render pass descriptor and setting the storeAction to multisampleResolve. I've also set tried storeAndMultisampleResolve to no avail.

I have created a resolve texture for the render pass descriptor, and it is the same width and height as the view and the same pixel format.

Given the above, I get a full red frame during rendering. I have used the metal debugger to look at the textures, and both the view's texture and the resolve texture have the correct rendering in them. I'm on an AMD machine where a fully red texture often indicates an uninitialized texture.

Is there anything I need to do to get the rendering to go to the screen?

Here's how I'm setting up the view, pipeline state, and resolve texture: