Core Animation renderer #16

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opened 2025-10-14 18:03:02 -06:00 by navan · 0 comments

navan commented

2025-10-14 18:03:02 -06:00

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Originally created by @nicklockwood on 7/17/2019

This PR demonstrates how to implement GPU-accelerated rendering using Core Animation. This allows the game to be rendered at full display resolution, and with much better performance.

The renderer uses a CALayer pool as a simple optimization to avoid churning the view hierarchy each frame. There are opportunities for further optimizations however, for example:

The map never changes, so the layers for walls and floor could just be generated once.
Currently, layers are generated for every wall and floor/ceiling tile in the map, but we could use raycasting to determine the visible set of tiles and only render those.

I haven't bothered to implement fizzlefade currently. It's not clear what the most efficient way to draw a fizzle effect would be in Core Animation, but if all else fails you could just use Core Graphics.

I also haven't implemented font color tinting, since there's no simple way to implement this with UIImages either (at least, not in real-time).

*Originally created by @nicklockwood on 7/17/2019* This PR demonstrates how to implement GPU-accelerated rendering using Core Animation. This allows the game to be rendered at full display resolution, and with much better performance. The renderer uses a CALayer pool as a simple optimization to avoid churning the view hierarchy each frame. There are opportunities for further optimizations however, for example: * The map never changes, so the layers for walls and floor could just be generated once. * Currently, layers are generated for every wall and floor/ceiling tile in the map, but we could use raycasting to determine the visible set of tiles and only render those. I haven't bothered to implement fizzlefade currently. It's not clear what the most efficient way to draw a fizzle effect would be in Core Animation, but if all else fails you could just use Core Graphics. I also haven't implemented font color tinting, since there's no simple way to implement this with UIImages either (at least, not in real-time).

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Reference: github/RetroRampage#16

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