Improving texture atlas allocation in WebRender

• Vrmac

  45 104 3.6 C#

  Vrmac Graphics, a cross-platform graphics library for .NET. Supports 3D, 2D, and accelerated video playback. Works on Windows 10 and Raspberry Pi4.

And ported from C to C++: https://github.com/Const-me/nanovg/blob/master/src/FontStash...

Font atlas is required to be dynamic because Unicode has too many different codepoints. Statically allocated bitmap fonts no longer work in practice. Based on the pictures in the article, it works better than what WebRender is doing.

The performance is good even on Raspberry Pi. This library https://github.com/Const-me/Vrmac uses 3 of them: RGBA for sprites, another RGBA for ClearType fonts, and grayscale one for non-ClearType fonts.

> a batch can only reference a fixed set of resources (such as GPU buffers and textures)

Technically that’s true, but not practically. There’s GPU resource type called “texture array”. It’s possible to append new layers into an array without moving data across PCIe and back.

• fontstash

  1 655 0.0 C

  Light-weight online font texture atlas builder

https://github.com/memononen/fontstash/blob/203fec2eb6a8905a...

• InfluxDB

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• noclip.website

  203 3,101 9.4 TypeScript

  A digital museum of video game levels

I wrote a basic allocator for runtime lightmap packing (a very different problem than dynamic image packing tbf), and a simple skyline got me very good results, for about 50 lines of code:

https://github.com/magcius/noclip.website/blob/master/src/So...

Compared to shelf, I think it did really well on the input data I had. I didn't even use the Halo Reach tricks for removing border padding when packing subpixel lightmaps!

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