[Gathering] Efficient Rendering / Optimizing

[DasLixou]

[Gathering] Efficient Rendering / Optimizing

[DasLixou]

Other things to consider:

• Layered Rendering (from discord conversation with @geom3trik )
• Sectioned(idk a name for that?) Requests => For animations do we really want to call redraw request every time ourselves? We could say it is animated and optimize with that information

[geom3trik]

Repeating here for transparency:

Ah cool 🙂 what you're describing is, more or less, what I had planned. It's something called dirty regions (it has other names too). Essentially you figure out which views need redrawing and then figure out a bounding rectangle which encompasses all of them, then redraw those views using scissor.

As you pointed out, redrawing a view can cause other views behind it to redraw as well, potentially multiple times (but this can still be worth it overall). There's a number of tradeoffs and decisions to be made here. E.g. when is it more optimal to just rerender everything. Other similar ideas to consider are using tiles instead of dirty regions (a view may render in more than one tile), or a layered approach. The difficulty with layers is that a render target switch (rendering to an image and then back to the screen) can be quite expensive.