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00:00 Intro
08:04 Pacman cone
34:45 Instance
01:19:30 Define some data
01:41:13 Pick between inside/outside

sphaerophoria

A live coding session exploring GPU-based 2D signed distance field (SDF) generation in OpenGL, motivated by problems rendering emoji glyphs in a text renderer. The approach uses instanced rendering of cone-shaped geometry to compute per-pixel distances without CPU involvement. The session covers building a Pac-Man-style cone primitive with configurable opening angle, implementing OpenGL instanced rendering with per-instance vertex buffers (position, direction, angle), and beginning to derive cone orientations from contour winding order. The goal is to distinguish inside vs. outside regions using winding order to produce a proper signed distance field, replacing a broken CPU-side scanline rasterization approach.

Generating 2D signed distance fields in OpenGL