Looping over a canvas's framebuffer is a similar experience, just obviously a lot less performant. You also get easy access to the rest of your code's state/mem

Looping over a canvas's framebuffer is a similar experience, just obviously a lot less performant. You also get easy access to the rest of your code's state/memory compared to a GPU shader, which can't have its own persistent state and needs variables explicitly allocated and passed into it.