Sharp Sprite is a collection of Defold materials that implements Rotated Grid Super-Sampling (RGSS) for the Defold engine. If you use down-scaled high-resolution images in your game and you want to get rid of blurriness (because of mipmapping) or sharpness (because of disabled mipmapping), then RGSS is for you:
How does it work?
RGSS samples the texture multiple times with an offset on each sample and averages the results. For this, it uses a 4x MSAA rotated grid pattern, sometimes called 4 rooks.
It’s based on an original idea by Ben Golus - Sharper Mipmapping using Shader Based Supersampling.
Pros and Cons
- RGSS requires the OES_standard_derivatives OpenGL extension to run. It’s universally supported by WebGL 1.0, by the most of OpenGL ES 2.0 devices (Android stats and by all iOS devices).
- On mobile GPUs, it can have a significant performance impact. You should always check the game performance on your target devices!
- Sharp Sprite’s implementation of RGSS is blurring at 1:1 scaling.
- Also, it doesn’t use mipmapped textures. You can turn off the mipmapping in your texture profile and save 30% of disk space.