The 2D hypot function for GLSL

sqrt(x * x + y * y) is easy, but it's subject to overflow and underflow in an environment with already limited precision. This function returns the length of a vec2 while avoiding overflow/underflow. Most of the time though, you're almost certainly fine without this.

#pragma glslify: hypot = require(glsl-hypot)

attribute vec3 position;

void main () {
  gl_FragColor = vec4(vec3(hypot(position.xy)), 1.0);
}

© 2016 Ricky Reusser. MIT License.