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When adding a fractional part to a number fixes your shader

Bruno Croci debugged a shader stutter issue that only appeared on one computer while implementing a Voronoi noise shader. The fix involved adding the fractional part of a float, and the article documents his week-long debugging adventure including disassembly and analysis of shader code.

Background

Shader development often involves hardware-specific behavior due to floating-point precision differences across GPUs, making cross-platform debugging challenging for graphics programmers.

Source
Lobsters
Published
Sep 16, 2026 at 06:20 PM
Score
5.0 / 10