Figure out presentation strategy

[raphlinus]

Currently the presentation strategy is hwnd render targets, which are older. A swapchain will provide better performance, but my experiments with swapchains (currently in the dxgi branch) show problems, especially with things like smooth window resizing.

I've written up my explorations, and have also created a thread on gamedev.net, as I've observed others struggling with this problem. In fact, artifacts and lag on window resize is an extremely common problem.

I'm offering a bounty of $2500 for a complete solution to this problem, see the blog for details. I've spent a lot of time on this (so much so it's gotten in the way of other progress), and, while I've learned a lot, feel like I'm getting to the end of that.

[raphlinus]

I should update this issue. It can more or less be considered closed as of #21. That said, I will still offer the bounty for what I consider a "perfect" solution, which I would count as flip presentation without the hwnd hack, with no artifacts as described in the linked writeup.

I'll hold this issue open for a bit, then close it if there's no activity for a while.

[be5invis]

@gongminmin 👈 graphics expert may help you