Glitch Shader

Implementation

1. 01

   RGB Split (chromatic aberration)

   Sample only the R and B channels offset in each direction → G stays at the original. If the offset is 0, no branching — same as the original.

2. 02

   2. Discrete time stepping (choppy glitch feel)

   floor quantizes time into steps so UV jumps abruptly → an analog tape glitch feel.

3. 03

   3. Texture × Texture UV distortion

   GlitchTexture (spatial pattern) × WiggleTexture (temporal variation) → swapping the two textures gives a completely different pattern.

4. 04

   4. Branchless Mask (Flip Blink + RGB Channel Cycle)

   Handled with step/lerp combinations, no GPU branches. #pragma target 2.0 Mobile target — branching cost minimized.

Tradeoffs & Future Work

Tradeoffs

• Up to 4 texture samples (Main×3 + Glitch + Wiggle + Mask) — overkill for simple UI, so usage must be limited
• No early-z benefit due to discard — pixels with mask 0 are explicitly discarded // however, this project uses no MSAA and uses FXAA

Future Work

• Atlas support — added ST transform so GlitchTexture / WiggleTexture can be sliced and used from a Sprite Atlas

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